CN111917106B

CN111917106B - Bus voltage parallel loop based on intelligent operation and maintenance

Info

Publication number: CN111917106B
Application number: CN202010644621.9A
Authority: CN
Inventors: 董晓刚; 孙玉彤; 董天集; 李伟明; 万志强; 王广政; 陈太丽; 罗科; 张定; 江辉鸿; 罗奕飞; 陈连军
Original assignee: ZHUHAI ELECTRIC POWER DESIGN INSTITUTE CO LTD; Guangdong Power Grid Co Ltd; Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: ZHUHAI ELECTRIC POWER DESIGN INSTITUTE CO LTD; Guangdong Power Grid Co Ltd; Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2022-05-10
Anticipated expiration: 2040-07-07
Also published as: CN111917106A

Abstract

The invention discloses a bus voltage parallel loop based on intelligent operation and maintenance, which consists of a microcomputer five-prevention coding lock BS, a transfer switch QK, a segmented or bus-coupled breaker on-position auxiliary contact, a disconnecting switch 1G auxiliary contact, a disconnecting switch 2G on-position auxiliary contact and a starting coil of a bus PT parallel relay BLJ. The bus PT parallel relay BLJ is a two-position relay, is provided with a starting coil and a return coil, and acts and keeps in a starting state after only the starting coil is electrified; when only the return coil is electrified, the relay returns and keeps in a return state; the invention can prevent the power source voltage-loss bus PT from secondary mis-disconnection.

Description

Bus voltage parallel loop based on intelligent operation and maintenance

Technical Field

The invention relates to the technical field of power system protection, in particular to a bus voltage parallel loop based on intelligent operation and maintenance.

Background

The voltage transformer, PT for short, is a special transformer for measuring high voltage of electric network, and can convert the high voltage into lower voltage according to a defined proportion, then connect it to the devices of protection, measurement and control, self-contained device, instrument and meter to make collection or measurement. The primary voltage of a voltage transformer is generally 57.7 volts or 100 volts, regardless of the voltage, and the secondary voltage is generally set to supply a voltage required for a voltage coil of an automatic device such as a meter and a relay protection. The primary actual transformation quantity is reflected by the secondary voltage change of the voltage transformer; the voltage transformer has the voltage isolation function of the high-voltage side and the low-voltage side, and the safety of work on a secondary circuit is ensured.

A bus voltage parallel device, called PT parallel device for short, is a device which correspondingly connects the secondary sides of voltage transformers on two sections of buses connected with a bus coupler or a section after the bus coupler or the section is put into normal operation at intervals. The bus voltage parallel device is used for enabling a bus PT secondary of another section of bus to be connected with the bus PT secondary of the section of bus in parallel when the bus PT of one section of bus is abnormal, has a fault or needs to be maintained and repaired, so that the voltage signal of the section of bus is lost, the bus voltage parallel device is used for enabling the bus PT secondary of another section of bus to be connected with the bus PT secondary in parallel, the voltage of the other section of bus is supplied to secondary equipment connected with the bus section through the bus voltage parallel device for use, and normal work of the equipment using the bus PT secondary voltage can be guaranteed. The parallel bus secondary voltage is an operation state when maintenance or maintenance PT is needed, and the bus PT secondary voltage does not need to be operated in the parallel state during normal operation.

And (3) carrying out a bus PT parallel normal operation procedure:

before the buses PT are parallelly connected for the second time, the primary system needs to be parallelly connected, namely the disconnecting switch and the breaker of the bus coupler or the section interval are closed to ensure the reliable connection of the two buses, then the bus coupler or the section interval protection tripping pressure plate is withdrawn, and then the bus PT secondary parallel handle is switched to the parallel position to realize bus PT secondary parallel. In the actually designed secondary parallel starting circuit, the isolating switches on two sides of the bus coupler or the sectionalizing switch and the closing auxiliary contact of the circuit breaker need to be connected in series to the secondary PT parallel starting circuit, so that the secondary parallel of the bus PT can be realized only under the condition of primary parallel.

And (3) the bus PT is parallel to remove the normal operation program: the method comprises the following two cases:

the first method comprises the following steps: firstly, confirming that two sections of parallel buses PT are in the input position once, confirming that a system is in a parallel state, namely, a bus-coupled or sectionally spaced disconnecting switch and a breaker are closed, ensuring that the two sections of buses are in reliable connection, and then switching a bus PT secondary parallel handle to a disconnection (or non-parallel) position to realize that the buses PT in operation are switched from parallel to disconnection.

And the second method comprises the following steps: firstly, confirming that two sections of buses PT in parallel are in exit positions once, and then switching a bus PT secondary parallel handle to a disconnection (or parallel forbidding) position to realize the disconnection of the PT in the bus stop process from parallel.

CN110336278A discloses a parallel operation method of transformers based on current relays, in which a circuit breaker is connected between several sections of buses, a transformer is connected between a high-voltage power supply bus and each section of bus, and the transformers meet the requirements of equal rated voltage, approximately equal transformation ratio, same connection group label, approximately equal per unit short-circuit impedance value and approximately equal short-circuit impedance angle; the error between the transformation ratios of the transformers is not more than +/-0.5 percent; the error between the short-circuit impedance per unit value and the short-circuit impedance angle of the transformers does not exceed +/-10%. When the current of the first transformer exceeds 5% of the set value, the circuit breaker QF2 is normally opened to normally close the second transformer, the second transformer is electrified and put into operation, when the current of the first transformer is reduced to the set value, the circuit breaker QF2 is reset, the second transformer is withdrawn from operation, and the following problems exist:

firstly, a bus voltage parallel starting loop has no forced locking measure, a primary bus can be disconnected from parallel at any time without being limited by whether the secondary operation of a bus PT is in parallel or not, and the method has obvious defects, often has operation conditions which do not accord with a normal operation procedure for the parallel disconnection of the bus PT and brings hidden danger to the safe and stable power supply of a power system; when the bus voltage secondary circuit is in a parallel state, the tripping circuit of the corresponding bus tie or the sectionalized circuit breaker is not forcibly locked, and only the tripping pressing plate is manually disconnected in a management mode, so that the risk that the primary system fault firstly disconnects the primary parallel circuit and then disconnects the bus voltage secondary parallel circuit and the secondary equipment and the circuit are burnt by short-circuit current exists.

Disclosure of Invention

The invention provides a bus voltage parallel loop based on intelligent operation and maintenance, which can prevent the defect of wrong parallel of buses PT.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a bus voltage parallel loop based on intelligent operation and maintenance comprises a microcomputer five-prevention lock BS, a microcomputer five-prevention main machine, a disconnecting switch 1G auxiliary contact, a disconnecting switch 2G auxiliary contact, a transfer switch QK, a segmented or bus-coupled breaker FDL auxiliary contact and a bus PT parallel relay BLJ, wherein the bus PT parallel relay BLJ is a double-position relay and comprises a starting coil and a return coil, and when only the starting coil is electrified, the bus PT parallel relay BLJ acts and is kept in a starting state; when only the return coil is electrified, the bus PT parallel relay BLJ returns and keeps in a return state, the first bus is parallel to the second bus through the isolating switch 1G auxiliary contact, the subsection or bus tie breaker FDL auxiliary contact and the isolating switch 2G auxiliary contact, wherein:

one end of the microcomputer five-prevention lock BS is connected with a positive power supply, the other end of the microcomputer five-prevention lock BS is electrically connected with one end of an auxiliary contact of a disconnecting switch 1G, the other end of the auxiliary contact of the disconnecting switch 1G is electrically connected with one end of an auxiliary contact of a sectional or bus-coupled circuit breaker FDL, the other end of the auxiliary contact of the sectional or bus-coupled circuit breaker FDL is electrically connected with one end of an auxiliary contact of a disconnecting switch 2G, the other end of the auxiliary contact of the disconnecting switch 2G is electrically connected with a contact 1 of a selector switch QK, a contact 2 of the selector switch QK is electrically connected with one end of a starting coil of a bus PT parallel relay BLJ, and the other end of the starting coil of the bus PT parallel relay BLJ is connected with a negative power supply;

the utility model discloses a computer five-prevention host computer, including change over switch QK, common measurement and control device of 5 contacts and 6 contacts switch-on of change over switch QK, the on-state of 5 contacts and 6 contacts of change over switch QK is the same with the on-state of 1 contact and 2 contacts of change over switch QK, common measurement and control device is with the on-state of change over switch QK and is sent microcomputer five-prevention host computer, intelligent five-prevention host computer and intelligent fortune dimension host computer.

Preferably, the five-prevention handheld key further comprises a five-prevention handheld key of the microcomputer, and the five-prevention handheld key of the microcomputer controls the communication state of the two ends of the five-prevention lock BS of the microcomputer through the five-prevention host of the microcomputer.

Preferably, the bus PT parallel relay BLJ is provided with 8 normally open contacts BLJ-1 to BLJ-8 which are respectively connected with different voltage windings of the bus PT, so that the parallel function of the different voltage windings of the bus PT is realized.

Preferably, the bus PT parallel relay BLJ is provided with 1 normally open contact BLJ-9, the normally open contact BLJ-9 is connected and connected into a public measurement and control device of the public measurement and control device to obtain information of 'bus PT secondary parallel middle' and the information is uploaded to the microcomputer five-prevention host, the intelligent five-prevention host and the intelligent operation and maintenance host.

Preferably, bus PT parallel relay BLJ is equipped with 2 normally open contact BLJ-12 and BLJ-13, inserts and is used for realizing respectively shutting sectional circuit breaker tripping 1 and shutting sectional circuit breaker tripping 2's return circuit through the normally open contact switch-on, bus PT parallel relay BLJ is equipped with 2 normally closed contact BLJ-14 and BLJ-15, inserts and is used for realizing respectively shutting sectional circuit breaker tripping 1 and shutting sectional circuit breaker tripping 2's return circuit through the normally closed contact disconnection.

Preferably, the bus PT parallel relay BLJ is provided with 2 normally open contacts BLJ-10 and BLJ-11 which are respectively connected with a power supply air switch for respectively realizing the tripping of the segmented interval circuit breaker control circuit 1 and a power supply air switch for respectively realizing the tripping of the segmented interval circuit breaker control circuit 2 through the normally open contact.

Preferably, one end of the return coil of the bus bar PT parallel relay BLJ is electrically connected to the negative power supply, the other end of the return coil of the bus bar PT parallel relay BLJ is electrically connected to the 4-contact of the switch QK, and the 3-contact of the switch QK is electrically connected to the other end of the auxiliary contact of the disconnector 2G;

the utility model discloses a computer five-prevention host computer, including change over switch QK, the public measurement and control device of 7 contacts and 8 contacts switch-on of change over switch QK, the switch-on state of 7 contacts and 8 contacts of change over switch QK is the same with the switch-on state of 3 contacts and 4 contacts of change over switch QK, public measurement and control device is with the switch-on state of change over switch QK send computer five-prevention host computer, intelligent five-prevention host computer and intelligent fortune dimension host computer to.

Preferably, the system also comprises a first bus PT (potential transformer) interval measurement and control device, a second bus PT interval measurement and control device and a bus coupler or subsection measurement and control device, wherein the bus coupler or subsection measurement and control device acquires states of a 1G auxiliary contact of an isolating switch, a 2G auxiliary contact of the isolating switch and a subsection or bus coupler circuit breaker FDL (fully drawn load) auxiliary contact, the first bus PT interval measurement and control device acquires first bus PT three-phase voltage information, first bus PT-1G auxiliary contact information and first bus PT three-phase voltage monitoring relay DYJ1 contact information, the second bus PT interval measurement and control device acquires second bus PT three-phase voltage information, second bus PT-2G auxiliary contact information and second bus PT three-phase voltage monitoring relay DYJ2 contact information, and the first bus interval measurement and control device, the second bus interval PT measurement and control device and the bus coupler or subsection measurement and control device transmit the acquired information to the microcomputer five-prevention host The intelligent five-prevention host and the intelligent operation and maintenance host.

Preferably, the intelligent five-prevention host computer is further included, a 9 contact of the change-over switch QK is electrically connected with one end of the five-prevention microcomputer lock BS, a 10 contact of the change-over switch QK is electrically connected with the other end of the five-prevention microcomputer lock BS, a 13 contact of the change-over switch QK is electrically connected with the other end of the 2G auxiliary contact of the isolating switch, a 14 contact of the change-over switch QK is electrically connected with one end of a ZNBL normally open contact of the common measurement and control device and one end of a ZNJL normally open contact of the common measurement and control device respectively, the other end of the ZNBL normally open contact of the common measurement and control device is electrically connected with one end of a starting coil of the bus PT parallel relay BLJ, and the other end of the ZNJL normally open contact of the common measurement and control device is electrically connected with the other end of a return coil of the bus PT parallel relay BLJ;

the utility model discloses a five protection intelligent main engine, including change over switch QK, the public measurement and control device of 11 contact and the public measurement and control device of 12 contact switch-on of change over switch QK, the on-state of 11 contact and the 12 contact of change over switch QK is the same with the on-state of 9 contacts and 10 contacts, 13 contacts and 14 contacts of change over switch QK, public measurement and control device is with the on-state of change over switch QK upward send intelligent five protection main engine.

Preferably, the system also comprises an intelligent operation and maintenance host and an upper-level intelligent operation and maintenance system, wherein information collected by the public measurement and control device, the bus joint or subsection measurement and control device, the first bus PT interval measurement and control device and the second bus PT interval measurement and control device is transmitted to the intelligent five-prevention host through an Ethernet in the station; the intelligent five-prevention host is connected with the intelligent operation and maintenance host through the Ethernet in the station, so that the intelligent five-prevention judgment and permission of the control command of the intelligent operation and maintenance host are realized, and the control command of the intelligent operation and maintenance host can be sent to a corresponding device in the station only after the permission of the intelligent five-prevention host; the intelligent operation and maintenance host is connected with the superior intelligent operation and maintenance system through a special communication interface and a special network channel, receives the control command of the superior intelligent operation and maintenance system operator on one hand, and feeds back the control operation result to the superior intelligent operation and maintenance system on the other hand.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

according to the circuit, a microcomputer five-prevention locking circuit is added in a parallel starting circuit at the bus PT secondary time, so that the bus PT parallel relay BLJ can be powered on and started after the bus or the sectional interval primary operation is carried out to the closing position; the two ends of the microcomputer five-prevention coding lock BS are communicated by an operator through a microcomputer five-prevention handheld key, so that the aim of starting the bus PT parallel relay BLJ after artificial confirmation is fulfilled, the defect of wrong parallel of the bus PT is effectively overcome, and the requirement of sequence of confirming once correct parallel and then carrying out secondary parallel is met. By adding the information of 'bus PT secondary parallel middle' automatically judged by a 'microcomputer five-prevention system' and locking the tripping operation of the segmented circuit breaker, the accident that secondary forced secondary equipment is burnt out after splitting the primary system caused by the bus PT is effectively prevented. By adopting the bus PT parallel relay BLJ with double positions, the bus PT parallel relay BLJ can be kept at the current position, an effective solution is provided for the microcomputer five-prevention loop to be used in an electric secondary loop, and meanwhile, the accident that the PT parallel five-prevention is caused when a direct-current power supply disappears is also prevented. Through adopting bus PT parallel relay BLJ action, automatic tripping control power air switch at segmentation interval realizes effectively cooperating with the intelligent control of intelligence fortune dimension, provides effective solution for the comprehensive use widely of intelligence fortune dimension. The characteristics of the existing bus-tie or sectionalized interval circuit breaker operation circuit are fully considered, and the requirements of the intelligent operation and maintenance transformer substation are well met. The upgrading and modifying work of the existing bus voltage parallel circuit is fully considered, the existing bus PT parallel start is slightly modified, and the upgrading and modifying work can be finished by the microcomputer five-prevention coding lock of the circuit and the addition of the contact of the corresponding relay and the change-over switch in the existing operation.

Drawings

Fig. 1 is a schematic structural diagram of a bus voltage parallel loop based on intelligent operation and maintenance.

FIG. 2 is a schematic diagram of the output contacts and function of the bus PT parallel relay BLJ.

Fig. 3 is a schematic diagram of information acquisition and transmission related to five preventions in the invention.

Fig. 4 is a diagram of an intelligent bus voltage secondary parallel and split junction output circuit.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent;

for the purpose of better illustrating the present embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;

it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Example 1

The embodiment provides a bus voltage parallel loop based on intelligent operation and maintenance, as shown in fig. 1 to 4, which is composed of six parts:

a first part: intelligent bus PT secondary parallel start-up circuit based on microcomputer five-prevention: the circuit consists of a microcomputer five-prevention coding lock BS, a selector switch QK, a segmented or bus-coupled breaker on-position auxiliary contact, an isolating switch 1G auxiliary contact, an isolating switch 2G auxiliary contact and a starting coil of a bus PT parallel relay BLJ. The bus PT parallel relay BLJ is a two-position relay, is provided with a starting coil and a return coil, and acts and keeps in a starting state after only the starting coil is electrified; when only the return coil is electrified, the relay returns and keeps in a return state; the design can prevent the power supply voltage-loss bus PT from being misclassified for the second time.

The working principle of the loop is explained as follows:

firstly, when a segmented or bus-coupled circuit breaker, an auxiliary contact of a disconnecting switch 1G and an auxiliary contact of a disconnecting switch 2G are in a closed position, the fact that a bus of a section I and a bus of a section II in an electrical primary system are in parallel is explained, the closed auxiliary contact of the segmented or bus-coupled circuit breaker, the auxiliary contact of the disconnecting switch 1G and the auxiliary contact of the disconnecting switch 2G are in a connected state, and a loop can perform bus PT secondary parallel;

if the changeover switch QK is switched to the position allowing parallel connection, namely parallel connection points are allowed to be connected, and when the changeover switch QK is switched to the position allowing parallel connection, the 1-2 contact point and the 5-6 contact point of the changeover switch QK are both in a connected state; after the 5-6 contact of the change-over switch QK is connected, the public measurement and control device transmits the information to the microcomputer five-prevention host computer through the network; meanwhile, after the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are connected, the sectional or bus tie measurement and control device transmits the information to the microcomputer five-prevention host computer through a network; the microcomputer five-prevention host machine receives the information and judges that: the primary system has paralleled the buses, and the change-over switch is switched to the 'parallel allowing' position after the manual confirmation that the primary buses are paralleled normally, so that the buses PT can be allowed to be paralleled for the second time; when the microcomputer five-prevention host sends the information of allowing the bus PT to be secondarily parallel to the microcomputer five-prevention handheld key, an operator enables two ends of the microcomputer five-prevention coding lock BS to be communicated by using the microcomputer five-prevention handheld key, then a negative power supply is connected with 1-2 contact points of a selector switch QK, an auxiliary contact point of a disconnecting switch 2G, an auxiliary contact point of a segmented or bus-connected circuit breaker FDL and an auxiliary contact point of a disconnecting switch 1G to one end of the microcomputer five-prevention coding lock BS through a bus PT parallel relay BLJ starting coil, the other end of the microcomputer five-prevention coding lock BS is connected with a positive power supply, and the action of the bus PT parallel relay BLJ is kept in an action state. And the bus PT is successfully paralleled for the second time.

Thirdly, when the bus PT parallel relay BLJ acts, on one hand, the relay BLJ is switched on by 8 normally open contacts BLJ-1 to BLJ-8, and the parallel function of different voltage windings of the bus PT is realized; on the other hand, bus PT parallel relay BLJ has 1 normally open auxiliary contact BLJ-9 (bus PT secondary on parallel and segmented opening operation blocked signal), the auxiliary contact BLJ-9 is connected and connected with a public measurement and control device, the public measurement and control device obtains the information of 'secondary parallel connection of the bus PT', and the information is uploaded to a microcomputer five-prevention host, after the microcomputer five-prevention host obtains the information, the fact that the bus PT secondary forbids 'tripping of a section switch' in parallel is judged, at the moment, a 'trip signal of the section switch is allowed' cannot be obtained at the microcomputer five-prevention host through a microcomputer five-prevention handheld key, namely, two ends of a microcomputer five-prevention coded lock DL-BS in a section breaker trip operation loop cannot be in short circuit through the microcomputer five-prevention handheld key, the section breaker operation loop cannot obtain a positive power supply, and the section breaker trip operation locking is achieved.

When the bus PT parallel relay BLJ acts, the bus PT parallel relay BLJ is provided with 2 normally open auxiliary contacts BLJ-12 which are communicated with BLJ-13 contacts, and a loop which is used for respectively realizing the tripping 1 of the blocking subsection circuit breaker and the tripping 2 of the blocking subsection circuit breaker is accessed through the normally open contacts; on the other hand, the bus PT parallel relay BLJ is provided with 2 normally closed auxiliary contacts BLJ-14 which are disconnected with BLJ-15 contacts, and a loop for realizing the tripping 1 and the tripping 2 of the blocking section breaker respectively through the disconnection of the normally closed contacts is accessed.

When the bus PT parallel relay BLJ acts, the bus PT parallel relay BLJ is provided with 2 normally open auxiliary contacts BLJ-10 which are connected with BLJ-11 contacts and respectively connected with a power supply air switch for respectively realizing tripping of a sectionalized interval circuit breaker control circuit 1 and a power supply air switch for tripping of a sectionalized interval circuit breaker control circuit 2 through the normally open contacts; and the circuit breaker is tripped off at the subsection interval to control the air switch of the power supply of the circuit, so that the circuit breaker is controlled to be powered off, and the purpose of locking the opening of the subsection circuit breaker is realized. The design has the advantages of meeting the requirements of intelligent operation and maintenance intelligent control and locking all the tripping commands at one time, including locking of local manual brake-separating commands.

A second part: intelligent bus PT secondary separation circuit based on microcomputer five-prevention: the circuit consists of a microcomputer five-prevention coding lock BS, a selector switch QK, a segmented (or bus-coupled) circuit breaker on auxiliary contact, an isolating switch 1G auxiliary contact, an isolating switch 2G auxiliary contact and a return coil of a bus PT parallel relay BLJ.

The working principle of the loop is explained as follows:

firstly, when a segmented or bus-coupled circuit breaker, an auxiliary contact of a disconnecting switch 1G and an auxiliary contact of a disconnecting switch 2G are all in closed position, the I section bus and the II section bus in an electric primary system are still in parallel, the closed auxiliary contact of the segmented or bus-coupled circuit breaker, the auxiliary contact of the disconnecting switch 1G and the auxiliary contact of the disconnecting switch 2G are all in a connected state, and a loop can perform secondary disconnection operation of a bus PT;

if the selector switch QK is switched to the position of 'allowing the disconnection', namely, the disconnection contact is allowed to be connected, and when the selector switch QK is switched to the position of 'allowing the disconnection', the 3-4 contact and the 7-8 contact of the selector switch QK are both in a connected state; after the 7-8 contact of the changeover switch QK is connected, the public measurement and control device transmits the information to the microcomputer five-prevention host computer through the network; meanwhile, after the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are connected, the sectional or bus tie measurement and control device transmits the information to the microcomputer five-prevention host computer through a network; the microcomputer five-prevention host machine receives the information and judges that: the primary system is still in parallel, and after the fact that the primary buses operate in parallel in a normal state is manually confirmed, the change-over switch is switched to a position allowing disconnection, and the buses PT can be allowed to be disconnected for the second time; when the microcomputer five-prevention host sends the information of 'allowing bus PT to be secondarily split' to the microcomputer five-prevention handheld key, an operator communicates two ends of the microcomputer five-prevention coding lock BS by using the microcomputer five-prevention handheld key, then a negative power supply returns to a coil through a bus PT parallel relay BLJ, a 3-4 contact of a switch QK, an isolation switch 2G auxiliary contact, a subsection or bus-coupled circuit breaker FDL auxiliary contact and an isolation switch 1G auxiliary contact to one end of the microcomputer five-prevention coding lock BS, the other end of the microcomputer five-prevention coding lock BS is connected with a positive power supply, and the bus PT parallel relay BLJ returns to be kept in a return state.

After the bus PT parallel relay BLJ returns, on one hand, the relay BLJ has 8 normally open contacts BLJ-1 to BLJ-8 to be disconnected, and the disconnection function of different voltage windings of the bus PT is realized; on the other hand, the bus PT parallel relay BLJ is provided with 1 normally open auxiliary contact BLJ-9, the auxiliary contact BLJ-9 is disconnected and connected into a public measurement and control device, the public measurement and control device obtains information that 'bus PT secondary is disconnected', the information is uploaded to a microcomputer five-prevention host, the microcomputer five-prevention host judges that the bus PT secondary is disconnected after obtaining the information and does not prohibit the section switch from tripping, at the moment, a 'trip signal of the section switch is allowed' can be obtained at the microcomputer five-prevention host through a microcomputer five-prevention handheld key, namely, two ends of a microcomputer five-prevention coding lock DL-BS in a section breaker trip operation loop are short-circuited through the microcomputer five-prevention handheld key, and the section breaker trip operation loop can obtain a positive power supply and cannot lock the section breaker trip operation.

After the bus PT parallel relay BLJ returns, the bus PT parallel relay BLJ has 2 normally open auxiliary contacts BLJ-12 and BLJ-13 which are disconnected, and the circuits for respectively locking the tripping 1 and 2 of the sectional circuit breaker can not be switched on through the normally open contacts; on the other hand, bus PT parallel relay BLJ has 2 normally closed auxiliary contacts BLJ-14 and BLJ-15 which are connected, and does not open the circuit of blocking section breaker trip 1 and blocking section breaker trip 2, respectively, through the normally closed contacts.

When the bus PT parallel relay BLJ returns, the bus PT parallel relay BLJ has 2 normally open auxiliary contacts BLJ-10 and BLJ-11 which are disconnected, the power supply air switch of the section interval circuit breaker control circuit 1 and the power supply air switch of the section interval circuit breaker control circuit 2 can not be respectively switched off through the normally open contacts, and the purpose of locking the section circuit breaker and separating the brake can not be achieved through the switching off of the section interval circuit breaker control circuit power supply air switch.

DYJ1 is expressed as: the I bus PT three-phase voltage monitoring relay is characterized in that I bus PT secondary voltage is connected between an I bus PT secondary circuit breaker 1DK and an I bus PT isolating switch PT-1G auxiliary contact; DYJ1 the action condition of the three-phase voltage monitoring relay is that when the three-phase voltage is less than the setting value U1, the DYJ1 relay judges that the bus voltage disappears, the normally closed contact is connected, and the normally open contact is disconnected; when one phase voltage of the three-phase voltage is greater than the setting value U2, the DYJ1 relay judges that the bus has voltage, the normally open contact of the bus is connected, and the normally closed contact of the bus is disconnected.

When the I mother PT is put into operation, the auxiliary contact of the isolating switch PT-1G is connected, and at the moment, if the I mother PT secondary three phases are all normally put into operation, namely the I mother PT secondary circuit breaker 1DK is in an on-position, the three-phase voltage monitoring relay DYJ1 judges that the I mother PT secondary has voltage, the DYJ1 normally open contact is closed, and the normally closed contact is opened; when the I mother PT secondary three phases are not normally put into operation, namely the I mother PT secondary circuit breaker 1DK is in a separated position, but the II mother PT secondary three phases are normally put into operation, the bus PT parallel relay BLJ acts and the contact is switched on, the three-phase voltage monitoring relay DYJ1 judges that the I mother PT secondary has voltage, the DYJ1 normally open contact is closed, and the normally closed contact is opened;

when the I mother PT does not run, the auxiliary contact of the isolating switch PT-1G is disconnected, if the I mother PT secondary three-phase circuit breaker 1DK is in an on position or in a off position, and the voltage access position of the three-phase voltage monitoring relay DYJ1 has no voltage, the three-phase voltage monitoring relay DYJ1 judges that the I mother PT secondary is free of voltage, the DYJ1 normally closed contact is closed, and the normally open contact is opened;

when the I bus PT is put into operation, the auxiliary contact of the isolating switch PT-1G is switched on, the I bus PT secondary three-phase circuit breaker 1DK is in an on position, when no power supply is connected to the bus for the first time, the voltage connection position of the three-phase voltage monitoring relay DYJ1 has no voltage, the three-phase voltage monitoring relay DYJ1 judges that the I bus PT secondary is voltage-free, the DYJ1 normally closed contact is closed, and the normally open contact is opened;

DYJ2 is expressed as: the II bus PT three-phase voltage monitoring relay is characterized in that II bus PT secondary voltage is connected between an II bus PT secondary circuit breaker 2DK and an isolation switch PT-2G auxiliary contact of II bus PT; DYJ2 the action condition of the three-phase voltage monitoring relay is that when the three-phase voltage is less than the setting value U1, the DYJ2 relay judges that the bus voltage disappears, the normally closed contact is connected, and the normally open contact is disconnected; when one phase of three-phase voltage is greater than the setting value U2, the DYJ2 relay judges that the bus has voltage, and the normally open contact of the bus is connected and the normally closed contact of the bus is disconnected.

When the II mother PT is put into operation, the auxiliary contact of the isolating switch PT-2G is switched on, and if the II mother PT secondary three-phase is normally put into operation, namely the II mother PT secondary circuit breaker 2DK is in an on-position, the three-phase voltage monitoring relay DYJ2 judges that the I mother PT secondary has voltage, the DYJ2 normally open contact is closed, and the normally closed contact is opened; at the moment, if the II mother PT secondary three phases are not normally put into operation, namely the II mother PT secondary circuit breaker 2DK is in a position division state, but the I mother PT secondary three phases are normally put into operation, the bus PT parallel relay BLJ acts and the contact is switched on, the three-phase voltage monitoring relay DYJ2 judges that the II mother PT secondary has voltage, the DYJ2 normally open contact is closed, and the normally closed contact is opened;

when the II mother PT does not run, the auxiliary contact of the isolating switch PT-2G is disconnected, and if the II mother PT secondary three-phase circuit breaker 2DK is in an on position or in a off position, and the voltage access position of the three-phase voltage monitoring relay DYJ2 has no voltage, the three-phase voltage monitoring relay DYJ2 judges that the II mother PT secondary is voltage-free, the DYJ2 normally closed contact is closed, and the normally open contact is disconnected;

when the II mother PT is put into operation, the auxiliary contact of the isolating switch PT-2G is switched on, the secondary three-phase circuit breaker 2DK of the II mother PT is in an on position, when no power supply is connected to the bus for the first time, the voltage connection position of the three-phase voltage monitoring relay DYJ2 has no voltage, the three-phase voltage monitoring relay DYJ2 judges that the II mother PT has no voltage for the second time, the DYJ2 normally closed contact is closed, and the normally open contact is opened;

when the bus PT parallel relay BLJ acts, the microcomputer allows the operation of 'bus PT secondary splitting' only when the three-phase voltage monitoring relays DYJ1 and DYJ2 of the two-section buses judge that the three phases have voltage or judge that the three phases have no voltage.

And a third part: five-prevention anti-misoperation lockout part of the microcomputer:

the microcomputer five-prevention information acquisition and basic judgment part comprises:

the relevant information acquisition device of this scheme is respectively: the device collects information and transmits the information to the microcomputer five-prevention host through the Ethernet in the station, the microcomputer five-prevention host sends the judged five-prevention result to the microcomputer five-prevention handheld key through the special communication interface, and an operator can switch on the microcomputer five-prevention lock at an allowable operation position through the microcomputer five-prevention handheld key. The information acquisition and processing method of each device is as follows:

public measurement and control device:

the bus PT secondary parallel middle signal is 'bus PT parallel relay BLJ' normally open auxiliary contact BLJ-9, after said contact is connected, the public measurement and control device can judge that the output is 'bus PT secondary in parallel', after said contact is disconnected, the public measurement and control device can judge that the output is 'bus PT secondary disconnection success';

the PT secondary permission parallel signal of the Utility bus is a 5-6 contact of a change-over switch QK, after the contact is connected, the public measurement and control device judges that the output is 'PT secondary permission parallel' of the bus, and after the contact is disconnected, the public measurement and control device judges that the output is 'PT secondary permission parallel' of the bus;

the PT secondary permission splitting signal of the Utility bus is a 7-8 contact of a change-over switch QK, after the contact is connected, the output of the public measurement and control device is judged as 'PT secondary permission splitting' of the bus, and after the contact is disconnected, the output of the public measurement and control device is judged as 'PT secondary permission parallel' of the bus;

the secondary permission remote operation signal of the PT bus is an 11-12 contact of a selector switch QK, after the contact is connected, the public measurement and control device judges that the output is 'bus PT secondary permission remote operation (namely: remote paralleling or disconnection)', and after the contact is disconnected, the public measurement and control device judges that the output is 'bus PT secondary prohibition';

after the contact is connected, the public measurement and control device judges that the intelligent operation and maintenance system device replaces a change-over switch QK which artificially confirms that the primary device is normally closed and the bus PT secondary remote operation is allowed to be normally connected, and then outputs the result as the bus PT secondary remote operation (namely, the bus PT secondary remote operation is forbidden) (namely, the bus PT secondary remote operation is parallel or disconnected) after the public measurement and control device judges that the intelligent operation and maintenance system device replaces the intelligent operation and maintenance system device to artificially confirm that the primary device is abnormally closed, and then outputs the result as the bus PT secondary remote forbidden operation (namely, the bus PT secondary remote parallel or disconnection).

Bus-tie or segmentation measurement and control device:

the closing position signal of the combined or segmented circuit breaker is a normally open auxiliary contact of an FDL auxiliary contact of the circuit breaker, after the contact is connected, the segmented measurement and control device judges that the output is that the bus or the segmented circuit breaker is in a closing state, and after the contact is disconnected, the segmented measurement and control device judges that the output is that the bus or the segmented circuit breaker is in an opening state;

the opening position signal of the combined or segmented circuit breaker is a normally closed auxiliary contact of an FDL auxiliary contact of the circuit breaker, after the contact is connected, the segmented measurement and control device judges that the output is that the bus or the segmented circuit breaker is in an opening state, and after the contact is disconnected, the segmented measurement and control device judges that the output is that the bus or the segmented circuit breaker is in a closing state;

the switching-on position signal of the Customs-gang or segmented 1G isolating switch is a normally-opened auxiliary contact of a 1G isolating switch auxiliary contact, after the contact is switched on, the segmented measurement and control device judges that the output is that a bus or a segmented 1G isolating switch is in a switching-on state, and after the contact is switched off, the segmented measurement and control device judges that the output is that the bus or the segmented 1G isolating switch is in a switching-off state;

the 1G disconnecting switch opening position signal of the Uygur bus coupler or the subsection 1G disconnecting switch is a 'normally closed auxiliary contact' of the 1G disconnecting switch, after the contact is connected, the subsection measurement and control device judges that the output is 'the bus or the subsection 1G disconnecting switch is in the opening state', and after the contact is disconnected, the subsection measurement and control device judges that the output is 'the bus or the subsection 1G disconnecting switch is in the closing state';

the switching-on position signal of the Customs-gang or segmented 2G disconnecting switch is a '2G disconnecting switch auxiliary contact' normally-opened auxiliary contact, after the contact is switched on, the segmented measurement and control device judges that the output is 'the bus or the segmented 2G disconnecting switch is in a switching-on state', and after the contact is switched off, the segmented measurement and control device judges that the output is 'the bus or the segmented 2G disconnecting switch is in a switching-off state';

the switch-off position signal of the Customs-gang or segmented 2G isolating switch is a ' 2G isolating switch auxiliary contact ' normally-closed auxiliary contact ', after the contact is switched on, the segmented measurement and control device judges that the output is ' the bus or the segmented 2G isolating switch is in a switch-off state ', and after the contact is switched off, the segmented measurement and control device judges that the output is ' the bus or the segmented 2G isolating switch is in a switch-on state ';

female PT interval measurement and control device of I:

the PT three phases of the I bus have voltage signals, which are normally open contacts of an I bus PT three-phase voltage monitoring relay DYJ1, after the contacts are switched on, the I bus PT measurement and control device judges that the output is that the PT three phases of the I bus have voltage, and after the contacts are switched off, the I bus PT measurement and control device judges that the output is that the PT three phases of the I bus have no voltage;

the PT three phases of the I bus have no voltage signal, and are normally closed contacts of an I bus PT three-phase voltage monitoring relay DYJ1, after the contacts are switched on, the I bus PT measurement and control device judges that the output is that the PT three phases of the I bus have no voltage, and after the contacts are switched off, the I bus PT measurement and control device judges that the output is that the PT three phases of the I bus have voltage;

the closing signal of the PT isolating switch of the I bus is a normally open auxiliary contact of a closing auxiliary contact PT-1G of the PT isolating switch of the I bus, after the contact is closed, the PT measuring and controlling device of the I bus judges that the output is that the PT isolating switch of the I bus is in the putting position, if the secondary open and close signals of the bus are effective, the PT three-phase of the I bus is judged to have voltage; after the contact is disconnected, the I bus PT measurement and control device judges that the output is that the I bus PT isolating switch is in an exit state, and then the I bus PT three-phase is judged to have no voltage;

the I bus PT isolating switch position dividing signal is a normally closed auxiliary contact of 'I bus PT isolating switch PT-1G position dividing auxiliary contact', after the contact is switched on, the I bus PT measuring and controlling device judges that the output is that the I bus PT isolating switch is in the exit state, and then it is judged that 'I bus PT three-phase is all free of voltage'; after the contact is disconnected, the I bus PT measurement and control device judges that the output is that the I bus PT isolating switch is in the input position, and if the secondary idle opening of the bus is effective in the on-position signal, the I bus PT three-phase voltage is judged;

the PT secondary three-phase air switch on-off of the I bus is an 'normally open auxiliary contact series signal of normally open auxiliary contacts of PT secondary air switches of the I bus', and after the contacts are switched on, the PT measurement and control device of the I bus judges that the PT secondary three-phase air switch on-off signals of the I bus are effective; after the contact is disconnected, the I bus PT measurement and control device judges that the output signals are invalid when the I bus PT secondary three-phase air switches are both in the on-position;

the PT secondary three-phase air switch of I bus is in a separate signal, which is a normally closed auxiliary contact of a normally closed auxiliary contact series signal of PT secondary air switches of I bus, after the contact is switched on, the PT measuring and controlling device of I bus judges that the PT secondary air switches of I bus are in a quit state; after the contact is disconnected, the I bus PT measurement and control device judges that the output signals are that the I bus PT secondary air switches are all in the position-dividing signals and are invalid.

II, mother PT interval measurement and control device:

the PT three phases of the II bus have voltage signals, and are normally open contacts of a PT three-phase voltage monitoring relay DYJ2 of the II bus, after the contacts are switched on, the PT measurement and control device of the II bus judges that the PT three phases of the II bus have voltage, and after the contacts are switched off, the PT measurement and control device of the II bus judges that the PT three phases of the II bus have no voltage;

PT three phases of II bus have no voltage signal, and the PT three phases of II bus are normally closed contact of "PT three-phase voltage monitoring relay DYJ 2" of II bus, after said contact is switched on, the PT measuring and controlling device of II bus can judge that the output is "PT three phases of II bus have no voltage", and after said contact is switched off, the PT measuring and controlling device of II bus can judge that the output is "PT three phases of II bus have voltage";

the PT isolating switch on-position signal of II bus is a normally open auxiliary contact of 'PT-2G on-position auxiliary contact of II bus PT isolating switch', after said contact is switched on, the PT measuring and controlling device of II bus can judge that the output is that the PT isolating switch of II bus is in the input position, if the secondary idle opening of said bus is effective in on-position signal, it can judge that 'PT three-phase of II bus has voltage'; after the contact is disconnected, the II bus PT measurement and control device judges that the output is that the II bus PT isolating switch is in an exit state, and then judges that 'no voltage exists in the II bus PT three phases';

the II bus PT isolating switch potential dividing signal is a normally closed auxiliary contact of a PT-2G potential dividing auxiliary contact of a II bus PT isolating switch, and after the contact is switched on, the II bus PT measuring and controlling device judges that the output is that the II bus PT isolating switch is in an exit state, and then judges that the II bus PT three-phase has no voltage; after the contact is disconnected, the II bus PT measurement and control device judges that the output is that the II bus PT isolating switch is in the input position, and if the secondary idle opening of the bus is effective in the on-position signal, the II bus PT three-phase voltage is judged;

II bus PT secondary three-phase air switches are all in the on-position signal, and are normally open auxiliary contacts of a normally open auxiliary contact series signal of the II bus PT secondary air switches, and after the contacts are switched on, the II bus PT measurement and control device judges that the output signals are that the II bus PT secondary three-phase air switches are all in the on-position signal; after the contact is disconnected, the II bus PT test control device judges that the output signals are invalid when the II bus PT secondary three-phase air switches are both in the on-position;

II bus PT secondary three-phase air switch is in a level-dividing signal, and is a normally closed auxiliary contact of 'II bus PT secondary air switch normally closed auxiliary contact series signal', after the contact is switched on, II bus PT measuring and controlling device judges that all air switches of II bus PT secondary are in exit state; after the contact is disconnected, the II bus PT measurement and control device judges that the output signals of the II bus PT secondary air switches are invalid in the position-dividing signals.

The five-prevention blocking logic of the opening microcomputer of the control loop of the bus-coupled or segmented circuit breaker is as follows:

when the information that the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain the information that the bus PT secondary selector switch QK is in the allowed parallel position through the Ethernet by the public measurement and control device is established, the next judgment is carried out; when the information that the bus PT secondary transfer switch QK is in the allowed parallel row position obtained by the microcomputer five-prevention host computer through the Ethernet by the public measurement and control device is not satisfied, judging that the switching-off operation condition of the sectionalized breaker is forbidden to be satisfied, and restarting the judgment;

the next step is: when the information of 'signals of the bus PT secondary in parallel' obtained by the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host through the Ethernet by the public measurement and control device is established, the next judgment is carried out; when the information that the bus PT secondary in-parallel signal acquired by the microcomputer five-prevention host through the Ethernet by the public measurement and control device is not true, judging that the switching-off operation condition of the segmented circuit breaker is forbidden to be met, and restarting the judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain the information that the PT three phases of the I bus have all voltage from the PT interval measurement and control device of the I bus through the Ethernet, the operation of the segmented circuit breaker is judged to be forbidden, and if the information that the PT three phases of the I bus have all voltage is obtained, the next judgment is carried out;

the next step is: and when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain the information that the PT three phases of the II bus have all voltage from the PT interval measurement and control device of the II bus through the Ethernet, judging that the switching-off operation of the sectional breaker is forbidden, and if the information that the PT three phases of the II bus have all no voltage is obtained, judging that the switching-off operation condition of the sectional breaker is forbidden to be met, and restarting the judgment.

And the closing microcomputer five-prevention locking logic of the control loop of the bus-coupled or segmented circuit breaker:

when the information that the bus PT secondary change-over switch QK is in the allowed parallel position, which is obtained by the microcomputer five-prevention host computer through the Ethernet by the public measurement and control device, is not satisfied, judging that the switching-on operation condition of the sectionalized breaker is forbidden to be satisfied, and restarting the judgment; when the information that the bus PT secondary change-over switch QK is in the allowed parallel position is obtained by the microcomputer five-prevention host machine through the Ethernet by the public measurement and control device, the next judgment is carried out;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire 'the sectional breaker is located at a switching-on position signal' information through the Ethernet by the sectional measurement and control device, judging that the switching-on operation condition of the sectional breaker is forbidden to be met, and restarting the judgment; and if the 'signal that the sectional breaker is positioned at the opening position' is obtained, judging that the closing operation of the sectional breaker is forbidden.

Bus PT secondary permission parallel microcomputer five-prevention locking logic:

when the microcomputer five-prevention host machine obtains the information that the bus PT secondary selector switch QK is at the allowable splitting position through the Ethernet by the public measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the information that the bus PT secondary selector switch QK is at the allowable parallel position is obtained, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'position signal of the sectional breaker at the opening' through the Ethernet by the sectional measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the 'position signal of the sectional breaker at the closing' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'signal of the disconnecting switch at the opening position at the sectional interval 1G' through the Ethernet by the sectional measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the 'signal of the disconnecting switch at the closing position at the sectional interval 1G' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'on-off position signal of the sectionalized interval 2G disconnecting switch' through the Ethernet by the sectional measurement and control device, the judgment that the parallel condition is not met is restarted, and if the 'on-off position signal of the sectionalized interval 2G disconnecting switch' is acquired, the judgment that the bus PT secondary parallel operation is allowed is carried out.

The bus PT secondary permission is separated the microcomputer five-prevention lockout logic:

when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information that the bus PT secondary change-over switch QK is at the allowable parallel position through the Ethernet by the public measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the information that the bus PT secondary change-over switch QK is at the allowable disconnection position is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'opening position signal of the sectional breaker' through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if acquiring the 'opening position signal of the sectional breaker', performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'on-off position signal of the sectionalized interval 1G isolating switch' through the Ethernet by the sectional measurement and control device, judging that the splitting condition is not met, restarting the judgment, and if the 'on-off position signal of the sectionalized interval 1G isolating switch' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'on-off position signal of the sectionalized interval 2G isolating switch' through the Ethernet by the sectional measurement and control device, judging that the splitting condition is not met, restarting the judgment, and if the 'on-off position signal of the sectionalized interval 2G isolating switch' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information meeting the requirement that the three phases of the bus I and the bus PT are all provided with pressure through the bus I and the bus PT spacing measurement and control device through the Ethernet, performing next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information meeting the requirement that the PT three phases of the II bus have all pressure through the II bus PT interval measurement and control device by the Ethernet, judging that the output allows the secondary splitting operation of the bus PT;

when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information that the 'PT three-phase all pressure of the I bus' is not satisfied by the PT interval measurement and control device of the I bus through the Ethernet, carrying out next judgment; on the other hand, if the microcomputer five-prevention host computer obtains judgment information that the condition that the three phases of the bus I PT are all no voltage is not met through the bus I PT interval measurement and control device by the Ethernet, the judgment information that the splitting condition is not met is judged, and the program returns to restart the judgment; on the other hand, if the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information meeting the requirement that the three phases of the bus PT are all no voltage through the bus PT interval measurement and control device by the Ethernet, the next judgment is carried out, namely the judgment that the three phases of the bus PT are all no voltage is carried out;

when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information that the PT three phases of the II bus are all pressed by the PT interval measurement and control device of the II bus through the Ethernet, the next judgment is carried out; on the other hand, if the microcomputer five-prevention host computer obtains judgment information that the condition that the three phases of the PT of the II bus are all no voltage is not met through the II bus PT interval measurement and control device by the Ethernet, the judgment information that the splitting condition is not met is judged, and the program returns to restart the judgment; on the other hand, if the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information meeting the requirement that the three phases of the II bus PT are all no voltage through the II bus PT interval measurement and control device through the Ethernet, judging that the output allows the secondary splitting operation of the bus PT;

the fourth part: intelligent bus PT secondary parallel start-up circuit based on intelligent five prevention of intelligence fortune dimension: the circuit consists of 9-10 contacts (allowing a remote operation contact 1) of a transfer switch QK, a segmented (or bus-coupled) breaker on-position auxiliary contact, an isolating switch 1G auxiliary contact, an isolating switch 2G auxiliary contact, 13-14 contacts (allowing a remote operation contact 2) of the transfer switch QK, an I-II bus PT remote intelligent parallel contact (ZNBL normally open contact output by a common measurement and control device) of common measurement and control output and a starting coil of a bus PT parallel relay BLJ.

The working principle of the loop is explained as follows:

firstly, when a segmented or bus-coupled circuit breaker, an isolating switch 1G auxiliary contact and an isolating switch 2G auxiliary contact are all in a closed position, the fact that a bus in a section I and a bus in a section II in an electrical primary system are in parallel is explained, at the moment, the segmented or bus-coupled circuit breaker closed position auxiliary contact, the isolating switch 1G auxiliary contact and the isolating switch 2G auxiliary contact are all in a connected state, and a loop can perform bus PT secondary parallel;

if the changeover switch QK is switched to the position of allowing remote operation, namely allowing the remote parallel contacts to be switched on, and when the changeover switch QK is switched to the position of allowing remote operation, the 9-10 contact, the 13-14 contact and the 11-12 contact of the changeover switch QK are all in a switching-on state; after the 11-12 contacts of the transfer switch QK are connected, the public measurement and control device transmits the information to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; if the intelligent judgment result of the intelligent operation and maintenance system is that the section interval primary equipment is normally switched on, the output normally open contact of the intelligent operation and maintenance system intelligently judges that the primary equipment is normally switched on is connected and is connected to the common measurement and control device, and the common measurement and control device judges that the intelligent operation and maintenance system replaces the artificial confirmation of the normal switching on of the primary equipment and transmits the information to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; meanwhile, the subsection or bus tie breaker FDL auxiliary contact, the isolating switch 1G auxiliary contact and the isolating switch 2G auxiliary contact are all connected, and then subsection or bus tie) measurement and control devices send the information to the intelligent five-prevention host and the intelligent operation and maintenance host through a network; the intelligent five-prevention host and the intelligent operation and maintenance host receive the information and then judge that: the primary system has paralleled the buses, and the intelligent operation and maintenance replaces the artificial confirmation that the primary buses are paralleled normally and the change-over switch is switched to the position of allowing remote operation, so that the secondary intelligent paralleling of the buses PT can be allowed; at the moment, if the upper-level intelligent operation and maintenance system judges that the remote intelligent paralleling is allowed and sends a 'bus PT secondary intelligent paralleling' task to the substation intelligent operation and maintenance host machine through the communication network, the substation intelligent operation and maintenance host machine judges that the intelligent paralleling is allowed and applies for the judgment to the intelligent five-prevention host machine in the substation and allows the 'bus PT secondary intelligent paralleling', the intelligent five-prevention host machine sends 'bus PT secondary intelligent paralleling' information to the intelligent operation and maintenance host machine according to the judgment results, the intelligent operation and maintenance host machine informs the public measurement and control device through the network to start the ZNBL relay to output an 'I-II bus PT remote intelligent paralleling' contact, when the public measurement and control device starts the BL relay to enable the 'I-II bus PT remote intelligent paralleling' contact to be connected, the negative power source starts a coil through a bus paralleling relay BLJ, ZNBL relay contact, 13-14 contact of the change-over switch QK, 2G closing auxiliary contact, FDL closing auxiliary contact, 1G closing auxiliary contact and 9-10 contact of the change-over switch QK are connected to the positive power supply, and the 'bus PT parallel relay BLJ' acts. And secondary remote intelligent paralleling of the bus PT of the intelligent operation and maintenance system is realized.

After the bus PT parallel relay BLJ acts, on one hand, the relay BLJ is provided with 8 normally open contacts BLJ-1 to BLJ-8 to be switched on, so that the parallel function of different voltage windings of the bus PT is realized; on the other hand, the bus PT parallel relay BLJ has 1 normally open auxiliary contact BLJ-9, the auxiliary contact BLJ-9 is connected and connected with a public measurement and control device, the public measurement and control device obtains the information of 'secondary parallel middle of bus PT', and sends the information to the intelligent five-prevention host and the intelligent operation and maintenance host and the superior intelligent operation and maintenance system, after the information is obtained by the intelligent five-prevention host and the intelligent operation and maintenance host, the secondary parallel middle of bus PT is judged to be forbidden to 'carry out section switch tripping', at the moment, the superior intelligent operation and maintenance system forbids to send a 'carry out section switch tripping' task command to the intelligent operation and maintenance host of the transformer substation through a communication network, the intelligent operation and maintenance host of the transformer substation forbids to send a 'carry out section switch tripping' task command to the section measurement and control device in the transformer substation through the network, and the intelligent five-prevention host forbids to apply for 'carrying out section switch tripping' permission, the intelligent operation and maintenance system trip operation function of the forbidding the sectional circuit breaker is realized through multiple locking, and the requirements of high reliability for preventing errors and attacks are met.

When the bus PT parallel relay BLJ acts, the bus PT parallel relay BLJ is provided with 2 normally open auxiliary contacts BLJ-12 which are communicated with BLJ-13 contacts, and a loop which is used for respectively realizing the tripping 1 of the blocking subsection circuit breaker and the tripping 2 of the blocking subsection circuit breaker is accessed through the normally open contacts; on the other hand, bus PT parallel relay BLJ has 2 normally closed auxiliary contacts BLJ-14 and BLJ-15 which are disconnected, and is connected with a loop for respectively realizing blocking section breaker tripping 1 and blocking section breaker tripping 2 through normally closed contact disconnection (note: the blocking non-blocking mechanism box of the section is locally and manually opened.)

When the bus PT parallel relay BLJ acts, the bus PT parallel relay BLJ is provided with 2 normally open auxiliary contacts BLJ-10 which are connected with BLJ-11 contacts and respectively connected with a power supply air switch for respectively realizing tripping of a sectionalized interval circuit breaker control circuit 1 and a power supply air switch for tripping of a sectionalized interval circuit breaker control circuit 2 through the normally open contacts; and the sectionalized interval circuit breaker is tripped to control the air switch of the loop power supply, so that the circuit breaker controls the loop to be powered off, and the purpose of locking the opening of the sectionalized circuit breaker is realized. The design has the advantages of meeting the requirement of intelligent operation and maintenance intelligent control and locking all the tripping commands at one time, including locking of local manual opening commands.

A fifth part: intelligent bus PT secondary separation return circuit based on intelligent operation and maintenance intelligent five-prevention:

intelligent bus PT secondary separation return circuit based on intelligent operation and maintenance intelligent five-prevention: the circuit consists of 9-10 contacts (allowing a remote operation contact 1) of a switch QK, a sectionalized (or bus-coupled) breaker on-position auxiliary contact, a disconnecting switch 1G auxiliary contact, a disconnecting switch 2G auxiliary contact, 13-14 contacts (allowing a remote operation contact 2) of the switch QK, an I-II bus PT remote intelligent disconnection contact (ZN normally open contact output by a common measurement and control device) of common measurement and control output and a disconnection return coil of a bus PT parallel relay BLJ.

The working principle of the loop is explained as follows:

firstly, when a segmented or bus-coupled circuit breaker, an auxiliary contact of a disconnecting switch 1G and an auxiliary contact of a disconnecting switch 2G are all in closed positions, it is indicated that a bus of a section I and a bus of a section II in an electrical primary system are in parallel, the closed auxiliary contact of the segmented or bus-coupled circuit breaker, the auxiliary contact of the disconnecting switch 1G and the auxiliary contact of the disconnecting switch 2G are all in a connected state, and a loop can perform secondary parallel disconnection operation on a bus PT;

if the changeover switch QK is switched to the position of allowing remote operation, namely allowing the remote parallel contacts to be switched on, and when the changeover switch QK is switched to the position of allowing remote operation, the 9-10 contact, the 13-14 contact and the 11-12 contact of the changeover switch QK are all in a switching-on state; after the 11-12 contacts of the transfer switch QK are connected, the public measurement and control device transmits the information to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; if the intelligent judgment result of the intelligent operation and maintenance system is that the section interval primary equipment is normally switched on, the output normally open contact of the intelligent operation and maintenance system intelligently judges that the primary equipment is normally switched on is connected and is connected to the common measurement and control device, and the common measurement and control device judges that the intelligent operation and maintenance system replaces the artificial confirmation of the normal switching on of the primary equipment and transmits the information to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; meanwhile, after the sectional or bus tie breaker FDL auxiliary contact, the isolating switch 1G auxiliary contact and the isolating switch 2G auxiliary contact are connected, the sectional or bus tie measurement and control device transmits the information to an intelligent five-prevention host computer through a network to carry out a task order of 'sectional switch tripping'; the intelligent five-prevention host computer performs a task of 'tripping a section switch' so as to judge that the received information is that: the intelligent operation and maintenance replaces the manual confirmation that the primary system buses are in parallel and the change-over switch is switched to the position allowing remote operation, so that the buses PT can be allowed to be intelligently disconnected for the second time; at this time, if the superior intelligent operation and maintenance system judges that the secondary intelligent disconnection of the bus PT can be allowed and sends a task command of ' performing secondary intelligent disconnection of the bus PT ' to the intelligent operation and maintenance host computer of the transformer substation through the communication network, the intelligent operation and maintenance host computer of the transformer substation judges that the secondary intelligent disconnection of the bus PT can be allowed and applies for judgment to the intelligent five-prevention host computer in the transformer substation and allows ' intelligent disconnection of the bus PT secondary ', therefore, the intelligent five-prevention host computer sends information of ' allowing secondary intelligent disconnection of the bus PT ' to the intelligent operation and maintenance host computer according to the judgment results, the intelligent operation and maintenance host computer informs the public measurement and control device through the network that the ZNJL relay can be started to output a ' intelligent disconnection ' contact of the bus PT between I and II, and after the public measurement and control device starts the JL relay to enable a remote intelligent disconnection ' contact of the bus PT between I and II to be switched on, the negative power supply returns to a disconnection coil through the parallel bus PT BLJ, ZNJL relay contact, 13-14 contact of transfer switch QK, 2G closes a position auxiliary contact, FDL closes a position auxiliary contact, 1G closes a position auxiliary contact, 9-10 contact of transfer switch QK are connected to the positive power supply, bus PT parallels relay BLJ action, realize intelligent fortune dimension system bus PT secondary long-distance intelligence and separate the row, realize bus PT secondary long-distance intelligence through multiple judgement promptly and separate the row operation function, satisfy the high reliable mistake of preventing and prevent the attack requirement.

After the bus PT parallel relay BLJ returns, on one hand, the relay BLJ has 8 normally open contacts BLJ-1 to BLJ-8 to be disconnected, and the disconnection function of different voltage windings of the bus PT is realized; on the other hand, the bus PT parallel relay BLJ is provided with 1 normally-open auxiliary contact BLJ-9, the auxiliary contact BLJ-9 is disconnected and connected into a public measurement and control device, the public measurement and control device obtains information that bus PT secondary is already disconnected, the information is uploaded to an intelligent five-prevention host and an intelligent operation and maintenance host, after the intelligent five-prevention host and the intelligent operation and maintenance host obtain the information, the bus PT secondary is judged to be disconnected, and the 'tripping of a section switch' is not forbidden, at the moment, the intelligent five-prevention host and the intelligent operation and maintenance host both judge that the bus PT secondary is not in parallel and judge that the section switch is not forbidden 'to trip' when the upper intelligent operation and maintenance system judges that the bus PT secondary is not in parallel and send a 'task command of tripping of the section switch' to the intelligent operation and maintenance host of the transformer substation through a communication network, the intelligent operation and maintenance host of the transformer substation judges that the bus PT secondary is not in parallel and applies for judgment and allows 'entering' to the intelligent five-prevention host When the line section switch is tripped ' to permit, the intelligent five-prevention host judges and sends a ' section switch trip signal is not forbidden ' to the intelligent operation and maintenance host, and then the intelligent operation and maintenance system of the section breaker can be tripped.

After the action of the bus PT parallel relay BLJ, the microcomputer five-prevention and intelligent five-prevention allow the operation of 'bus PT secondary disconnection' only after the three-phase voltage monitoring relays DYJ1 and DYJ2 of the two sections of buses judge that the three phases have voltage or judge that the three phases have no voltage.

A sixth part: the five intelligent prevention information acquisition and anti-misoperation locking part:

the intelligent five-prevention information acquisition and basic judgment part comprises the following steps:

the relevant information acquisition device of this scheme is respectively: the system comprises a public measurement and control device, a bus coupler or subsection measurement and control device, a bus PT interval measurement and control device I and a bus PT interval measurement and control device II, wherein information collected by the devices is transmitted to an intelligent five-prevention host computer through an Ethernet in a station; the intelligent five-prevention host is connected with the intelligent operation and maintenance host through the Ethernet in the station, so that the intelligent five-prevention judgment and permission of the control command of the intelligent operation and maintenance host are realized, and the control command of the intelligent operation and maintenance host can be sent to a corresponding device in the station only after the permission of the intelligent five-prevention host; the intelligent operation and maintenance host is connected with the superior intelligent operation and maintenance system through a special communication interface and a special network channel, on one hand, the intelligent operation and maintenance host receives a control command of an operator of the superior intelligent operation and maintenance system, and on the other hand, the intelligent operation and maintenance host feeds back a control operation result to the superior intelligent operation and maintenance system. The information acquisition and processing method of each device is as follows:

public measurement and control device:

the bus PT secondary parallel middle signal is a bus PT parallel relay BLJ normally open auxiliary contact BLJ-9, after the contact is connected, the public measurement and control device judges that the output is 'bus PT secondary in parallel', and after the contact is disconnected, the public measurement and control device judges that the output is 'bus PT secondary disconnection success';

the bus PT secondary permission remote operation signal is an 11-12 contact of a selector switch QK, after the contact is connected, the public measurement and control device judges that the output is 'bus PT secondary permission remote operation (namely remote parallel or disconnection)', and after the contact is disconnected, the public measurement and control device judges that the output is 'bus PT secondary prohibition remote operation (namely remote parallel or disconnection)';

the intelligent operation and maintenance system intelligently judges that the output sectionalized interval primary equipment is normally switched on, namely, a contact of the intelligent operation and maintenance system intelligently judges that the primary equipment is normally switched on is switched on, after the contact is switched on, the public measurement and control device judges that the output is bus PT secondary remote operation permission (namely, remote parallel or disconnection) after the intelligent operation and maintenance system replaces artificial confirmation of the normal switching on of the primary equipment, and after the contact is switched off, the public measurement and control device judges that the intelligent operation and maintenance system replaces artificial confirmation of the abnormal switching on of the primary equipment, the output is bus PT secondary remote operation prohibition (namely, remote parallel or disconnection).

Bus-tie or segmentation measurement and control device:

female PT interval measurement and control device of I:

PT secondary three-phase air switches of the I bus are all in the on-position signals, the PT secondary three-phase air switches of the I bus are normally-opened auxiliary contacts of a normally-opened auxiliary contact series signal, and after the contacts are switched on, the PT measuring and controlling device of the I bus judges that the output signals are effective in the on-position signals of the PT secondary three-phase air switches of the I bus; after the contact is disconnected, the I bus PT measurement and control device judges that the output signals are invalid when the I bus PT secondary three-phase air switches are both in the on-position;

PT secondary three-phase air switches of the I bus are all in a position-dividing signal, namely a normally closed auxiliary contact of a normally closed auxiliary contact series signal of PT secondary air switches of the I bus, and after the contact is switched on, the PT measuring and controlling device of the I bus judges that the PT secondary air switches of the I bus are all in an exit state; after the contact is disconnected, the I bus PT measurement and control device judges that the output signals are that the I bus PT secondary air switches are all in the position-dividing signals and are invalid.

II, mother PT interval measurement and control device:

PT three phases of II bus have voltage signals, which are normally open contacts of PT three-phase voltage monitoring relay DYJ2 of II bus, after the contacts are switched on, the PT measuring and controlling device of II bus judges that the output is that PT three phases of II bus have voltage, and after the contacts are switched off, the PT measuring and controlling device of II bus judges that the output is that PT three phases of II bus have no voltage;

II bus PT secondary three-phase air switch all-closing signal is 'II bus PT secondary air switch normally-open auxiliary contact series signal' normally-open auxiliary contact, after said contact is connected, II bus PT measuring and controlling device can judge that the output is II bus PT secondary three-phase air switch all-closing signal is effective; after the contact is disconnected, the II bus PT test control device judges that the output signals are invalid when the II bus PT secondary three-phase air switches are both in the on-position;

II bus PT secondary three-phase air switches are all in a position-dividing signal, and are normally closed auxiliary contacts of a normally closed auxiliary contact series signal of II bus PT secondary air switches, and after the contacts are connected, the II bus PT measurement and control device judges that all air switches of II bus PT secondary are in an exit state; after the contact is disconnected, the II bus PT measurement and control device judges that the output signals of the II bus PT secondary air switches are invalid in the position-dividing signals.

Separating intelligent five-prevention blocking logic and intelligent operation and maintenance anti-misoperation logic of a control loop of the bus-coupled or segmented circuit breaker:

when the information that the 'intelligent five-prevention host computer' obtains the 'bus PT secondary switch QK at the position allowing remote operation' through the Ethernet by the public measurement and control device is established, the next judgment is carried out; when the information that the bus PT secondary change-over switch QK is at the remote operation position allowed by the intelligent five-prevention host computer is not established, the intelligent operation and maintenance system is judged to be forbidden to carry out on the condition that the operation condition of the section breaker is not met, and the judgment is restarted;

the next step is: the next step is: when the information of 'signals of the bus PT in parallel for the second time' is obtained by the public measurement and control device through the Ethernet, the intelligent five-prevention host and the intelligent operation and maintenance host carry out the next judgment; when the information that the signals of the bus PT secondary in parallel are obtained by the intelligent five-prevention host and the intelligent operation and maintenance host through the Ethernet by the public measurement and control device is not true, judging that the operation condition for switching off the segmented circuit breaker by the intelligent operation and maintenance system is forbidden is not met, and restarting the judgment;

the next step is: when the microcomputer five-prevention host and the intelligent operation and maintenance host acquire the information that the PT three phases of the I bus have all voltage from the PT interval measurement and control device of the I bus through the Ethernet, the operation of opening the section breaker is judged to be forbidden, and if the information that the PT three phases of the I bus have all voltage is acquired, the next judgment is carried out;

the next step is: when the microcomputer five-prevention host and the intelligent operation and maintenance host acquire the information of 'II bus PT three-phase uniform voltage' from the II bus PT interval measurement and control device through the Ethernet, the operation of opening the section breaker is judged to be forbidden, if the information of 'II bus PT three-phase uniform voltage' is acquired, the operation condition of forbidding the operation of opening the section breaker is judged not to be met, and the judgment is restarted;

the intelligent five-prevention closing logic and the intelligent operation and maintenance anti-misoperation logic of the bus-tie or section circuit breaker control loop are as follows:

when the system change-over switch QK is switched to a 'bus PT secondary change-over switch QK is at a position allowing remote operation', when the bus tie or the sectionalized interval isolating switch and the circuit breaker are both in a closed position, the bus PT secondary parallel cannot be automatically carried out by mistake, so that an intelligent five-prevention system is not used for carrying out closing locking and corresponding judgment on the bus tie or the sectionalized interval circuit breaker;

the bus PT secondary allows parallel intelligent five-prevention locking logic and intelligent operation and maintenance anti-misoperation logic:

when the information that the bus PT secondary change-over switch QK is at the position allowing the remote operation is not obtained by the intelligent five-prevention host and the intelligent operation and maintenance host through the Ethernet by the public measurement and control device, judging that the parallel condition is not satisfied, restarting the judgment, and if the information that the bus PT secondary change-over switch QK is at the position allowing the remote operation is obtained, performing the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the position signal of the sectionalized circuit breaker at the opening through the Ethernet by the sectional measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the information of the position signal of the sectionalized circuit breaker at the closing position is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'signal of the disconnecting switch at the opening position at the sectional interval 1G' by the sectional measurement and control device through the Ethernet, the judgment that the parallel condition is not met is started again, and if the 'signal of the disconnecting switch at the closing position at the sectional interval 1G' is acquired, the next step of judgment is carried out;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'sectional interval 2G disconnecting switch on-off position signal' from the sectional measurement and control device through the Ethernet, the judgment that the parallel condition is not met is restarted, and if the 'sectional interval 2G disconnecting switch on-off position signal' is acquired, the next step of judgment is carried out;

the next step is: when the information that the intelligent operation and maintenance system intelligently judges that the primary equipment at the interval of the subsections is normally switched on is obtained by the intelligent operation and maintenance system through the public measurement and control device through the Ethernet, the parallel condition is judged to be not satisfied, the judgment is restarted, and if the information that the intelligent operation and maintenance system intelligently judges that the primary equipment at the interval of the subsections is normally switched on is obtained, the bus PT secondary parallel operation is judged to be allowed;

the intelligent five-prevention locking logic and the intelligent operation and maintenance anti-misoperation logic of the bus PT secondary permission splitting are as follows:

the intelligent five-prevention host and the intelligent operation and maintenance host acquire information that the bus PT secondary selector switch QK is at the remote operation allowed position from the public measurement and control device through the Ethernet, judge that the splitting condition is not satisfied, and restart the judgment, and if the information that the bus PT secondary selector switch QK is at the remote operation allowed position is obtained, perform the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the position signal of the sectionalized circuit breaker at the opening through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the information of the position signal of the sectionalized circuit breaker at the closing, performing the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'signal of the disconnecting switch at the opening position at the sectional interval 1G' through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the 'signal of the disconnecting switch at the closing position at the sectional interval 1G' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'signal of the sectionalized isolation switch at the opening position at the sectionalized interval 2G' through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the 'signal of the sectionalized isolation switch at the closing position at the sectionalized interval 2G' is acquired, performing the next judgment;

the next step is: judging that the parallel condition is not satisfied if the information that the intelligent operation and maintenance system intelligently judges that the primary equipment at the interval of the subsections is normally closed is not obtained by the intelligent operation and maintenance system and the intelligent operation and maintenance host through the public measurement and control device through the Ethernet, restarting the judgment, and judging the next step if the information that the intelligent operation and maintenance system intelligently judges that the primary equipment at the interval of the subsections is normally closed is obtained;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information meeting the requirement that the three phases of the PT of the I bus have all pressure through the I bus PT interval measurement and control device by the Ethernet, carrying out next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information meeting the requirement that the PT three phases of the II bus have all pressure through the II bus PT interval measurement and control device by the Ethernet, judging that the output allows the secondary disconnection operation of the bus PT;

when the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information that the PT three phases of the I bus are all pressurized from the PT interval measurement and control device of the I bus through the Ethernet, carrying out next judgment; on the other hand, if the judgment information that the three phases of the I bus PT are not equal to the voltage is not met is obtained by the I bus PT interval measurement and control device through the Ethernet by the intelligent five-prevention host and the intelligent operation and maintenance host, the disconnection condition is judged to be not met, and the program returns to restart the judgment; on the other hand, if the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information meeting the requirement that the three phases of the bus I and the bus PT are all non-pressure through the bus I and the bus PT interval measurement and control device through the Ethernet, the next step of judgment is carried out, namely the judgment that the three phases of the bus II and the bus PT are all non-pressure is carried out;

when the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information that the PT three phases of the II bus are all pressurized from the PT interval measurement and control device of the II bus through the Ethernet, the judgment of the next step is carried out; on the other hand, if the judgment information that the PT three phases of the II bus are not uniformly pressurized is obtained by the II bus PT interval measurement and control device through the Ethernet by the intelligent five-prevention host and the intelligent operation and maintenance host, the disconnection condition is judged to be not satisfied, and the program returns to restart the judgment; on the other hand, if the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information meeting the requirement that the three phases of the II bus PT are all no voltage through the II bus PT interval measurement and control device through the Ethernet, the judgment information is output to allow the bus PT secondary splitting operation.

The same or similar reference numerals correspond to the same or similar parts;

the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;

it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. It will be apparent to those skilled in the art that other variations and modifications can be made on the basis of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A bus voltage parallel loop based on intelligent operation and maintenance is characterized by comprising a microcomputer five-prevention lock BS, a microcomputer five-prevention host, a disconnecting switch 1G auxiliary contact, a disconnecting switch 2G auxiliary contact, a selector switch QK, a remote intelligent parallel contact ZNBL, a remote intelligent disconnection contact ZNJL, a sectional or bus-coupled breaker FDL auxiliary contact and a bus PT parallel relay BLJ, wherein the bus PT parallel relay BLJ is a double-position relay and comprises a starting coil and a return coil, and when only the starting coil is electrified, the bus PT parallel relay BLJ acts and is kept in a starting state; when only the return coil is electrified, the bus PT parallel relay BLJ returns and keeps in a return state, the first bus is parallel to the second bus sequentially through an isolating switch 1G auxiliary contact, a subsection or bus tie breaker FDL auxiliary contact and an isolating switch 2G auxiliary contact, wherein:

the connection state of the 5 contact and the 6 contact of the change-over switch QK is the same as that of the 1 contact and the 2 contact of the change-over switch QK, and the common measurement and control device transmits the connection state of the change-over switch QK to the microcomputer five-prevention host, the intelligent five-prevention host and the intelligent operation and maintenance host;

when the sectional or bus tie circuit breaker, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are all in the closed position, it is indicated that the I section bus and the II section bus in the primary electrical system are parallel, at the moment, the sectional or bus tie circuit breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are all in the connected state, and the loop can perform bus PT secondary parallel;

if the changeover switch QK is switched to the position of allowing parallel connection, namely the parallel connection contact is allowed to be connected, and when the changeover switch QK is switched to the position of allowing parallel connection, the 1-2 contact and the 5-6 contact of the changeover switch QK are both in a connected state; after the 5-6 contact of the change-over switch QK is connected, the public measurement and control device transmits the information of connecting the 5-6 contact of the change-over switch QK to the microcomputer five-prevention host computer through the network; meanwhile, after the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are connected, the sectional or bus tie measurement and control device transmits information of the connection of the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact to the microcomputer five-prevention host computer through a network; the microcomputer five-prevention host machine receives the information and judges that: the primary system has paralleled the buses, and the change-over switch is switched to the 'parallel allowing' position after the manual confirmation that the primary buses are paralleled normally, so that the buses PT can be allowed to be paralleled for the second time; when the microcomputer five-prevention host machine sends the information of allowing bus PT to be in secondary parallel to the microcomputer five-prevention handheld key, an operator enables two ends of a microcomputer five-prevention lock BS to be communicated by using the microcomputer five-prevention handheld key, then a negative power supply passes through a bus PT parallel relay BLJ starting coil, a 1-2 contact of a selector switch QK, an isolation switch 2G auxiliary contact, a subsection or bus-coupled circuit breaker FDL auxiliary contact and an isolation switch 1G auxiliary contact to one end of the microcomputer five-prevention lock BS, the other end of the microcomputer five-prevention lock BS is connected with a positive power supply, the bus PT parallel relay BLJ acts and is kept in an action state, and the bus PT is in secondary parallel successfully;

when a bus PT parallel relay BLJ acts, a public measurement and control device obtains information of 'bus PT secondary parallel middle' and sends the information to a microcomputer five-prevention host, the microcomputer five-prevention host obtains the information and judges that the bus PT secondary forbids 'section switch tripping' in parallel, at the moment, a microcomputer five-prevention handheld key cannot obtain 'section switch tripping allowing signals' at the microcomputer five-prevention host, namely, two ends of a microcomputer five-prevention lock BS in a section breaker tripping operation loop cannot be short-circuited through the microcomputer five-prevention handheld key, the section breaker operation loop cannot obtain a positive power supply, and the section breaker tripping operation locking is realized.

2. The intelligent operation and maintenance-based bus voltage parallel circuit as claimed in claim 1, further comprising a microcomputer five-prevention handheld key, wherein the microcomputer five-prevention handheld key controls the communication state of two ends of the microcomputer five-prevention lock BS through the microcomputer five-prevention host.

3. The intelligent operation and maintenance-based bus voltage parallel circuit as claimed in claim 2, wherein the bus PT parallel relay BLJ is provided with 8 normally open contacts BLJ-1 to BLJ-8, which are respectively connected with different voltage secondary windings of the bus PT, so as to realize the parallel function of the different voltage secondary windings of the bus PT.

4. The intelligent operation and maintenance-based bus voltage parallel circuit as claimed in claim 3, wherein the bus PT parallel relay BLJ is provided with 1 normally open contact BLJ-9, the normally open contact BLJ-9 is connected and connected to a common measurement and control device, the common measurement and control device obtains information of 'bus PT secondary parallel middle' and sends the information to the microcomputer five-prevention host, the intelligent five-prevention host and the intelligent operation and maintenance host.

5. The intelligent operation and maintenance-based bus voltage parallel circuit according to claim 4, wherein the bus PT parallel relay BLJ is provided with 2 normally open contacts BLJ-12 and BLJ-13, and is connected with a circuit for respectively realizing the tripping 1 and the tripping 2 of the blocking section breaker through the normally open contacts, and the bus PT parallel relay BLJ is provided with 2 normally closed contacts BLJ-14 and BLJ-15, and is connected with a circuit for respectively realizing the tripping 1 and the tripping 2 of the blocking section breaker through the normally closed contacts.

6. The intelligent operation and maintenance-based bus voltage parallel circuit as claimed in claim 5, wherein the bus PT parallel relay BLJ is provided with 2 normally open contacts BLJ-10 and BLJ-11, which are respectively connected to a power air switch for respectively realizing tripping on the sectionalized interval circuit breaker control circuit 1 and a power air switch for tripping on the sectionalized interval circuit breaker control circuit 2 through the normally open contacts.

7. The intelligent operation and maintenance-based bus voltage parallel circuit according to any one of claims 1 to 6, wherein one end of the return coil of the bus PT parallel relay BLJ is electrically connected with a negative power supply, the other end of the return coil of the bus PT parallel relay BLJ is electrically connected with a 4-contact of a switch QK, and a 3-contact of the switch QK is electrically connected with the other end of an auxiliary contact of a disconnecting switch 2G;

the switch-on state of the 7 contact and the 8 contact of the change-over switch QK is the same as the switch-on state of the 3 contact and the 4 contact of the change-over switch QK, and the common measurement and control device sends the switch-on state of the change-over switch QK to the microcomputer five-prevention host, the intelligent five-prevention host and the intelligent operation and maintenance host;

when the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are all in the closed position, it indicates that the I section bus and the II section bus in the primary electrical system are still in parallel, at the moment, the sectional or bus tie breaker closed position FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are all in the connected state, and the loop can perform the bus PT secondary disconnection operation;

if the selector switch QK is switched to the "disconnection permission" position, that is, the disconnection permission contact is turned on, and if the selector switch QK is switched to the "disconnection permission" position, the contacts 3 to 4 and the contacts 7 to 8 of the selector switch QK are both in the on state; after the 7-8 contact of the change-over switch QK is connected, the public measurement and control device transmits the information of connecting the 7-8 contact of the change-over switch QK to the microcomputer five-prevention host computer through the network; meanwhile, after the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are connected, the sectional or bus tie measurement and control device transmits information of the connection of the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact to the microcomputer five-prevention host computer through a network; the microcomputer five-prevention host machine receives the information and judges that: the primary system is still in parallel, and after the fact that the primary bus runs in parallel in a normal state is artificially confirmed, the change-over switch is switched to a position allowing disconnection, so that the bus PT can be allowed to be disconnected for the second time; when the microcomputer five-prevention host machine sends the information of allowing the bus PT to be secondarily split to the microcomputer five-prevention handheld key, an operator enables two ends of a microcomputer five-prevention lock BS to be communicated by using the microcomputer five-prevention handheld key, then a negative power supply returns to a coil through a bus PT parallel relay BLJ, a 3-4 contact of a switch QK, an isolation switch 2G auxiliary contact, a subsection or bus-coupled circuit breaker FDL auxiliary contact and an isolation switch 1G auxiliary contact to one end of the microcomputer five-prevention lock BS, the other end of the microcomputer five-prevention lock BS is connected with a positive power supply, and the bus PT parallel relay BLJ returns to and is kept in a return state;

after the bus PT parallel relay BLJ returns, on one hand, the relay BLJ has 8 normally open contacts BLJ-1 to BLJ-8 to be disconnected, and the splitting function of different voltage windings of the bus PT is realized; on the other hand, the bus PT parallel relay BLJ is provided with 1 normally-open auxiliary contact BLJ-9, the auxiliary contact BLJ-9 is disconnected and connected into a public measurement and control device, the public measurement and control device obtains information that 'the bus PT secondary is disconnected', the information is uploaded to a microcomputer five-prevention host, the microcomputer five-prevention host judges that the bus PT secondary is disconnected after obtaining the information, the tripping of the sectional switch is not forbidden, at the moment, a 'trip signal of the sectional switch is allowed' can be obtained at the microcomputer five-prevention host through a microcomputer five-prevention handheld key, namely, two ends of a microcomputer five-prevention lock BS in a tripping operation circuit of the sectional circuit breaker can be short-circuited through the microcomputer five-prevention handheld key, the operation circuit of the sectional circuit breaker can obtain a positive power supply, and the tripping operation of the sectional circuit breaker cannot be locked;

after the bus PT parallel relay BLJ returns, the bus PT parallel relay BLJ has 2 normally open auxiliary contacts BLJ-12 and BLJ-13 which are disconnected, and a loop for respectively locking the tripping 1 of the segmented circuit breaker and the tripping 2 of the segmented circuit breaker cannot be switched on through the normally open contacts; on the other hand, the bus PT parallel relay BLJ is provided with 2 normally closed auxiliary contacts BLJ-14 which are connected with BLJ-15 contacts, and the circuits for respectively locking the tripping 1 and 2 of the sectional circuit breakers cannot be disconnected through the normally closed contacts;

after the bus PT parallel relay BLJ returns, the bus PT parallel relay BLJ has 2 normally open auxiliary contacts BLJ-10 and BLJ-11 which are disconnected, the power supply air switch of the control circuit 1 of the tripping segmented interval circuit breaker and the power supply air switch of the control circuit 2 of the tripping segmented interval circuit breaker can not be switched on through the normally open contacts, and the purpose of locking the opening of the segmented circuit breaker can not be achieved through the power supply air switch of the control circuit of the tripping segmented interval circuit breaker;

DYJ1 is expressed as: the relay is connected with I bus PT secondary voltage between an I bus PT secondary circuit breaker 1DK and an I bus PT isolation switch PT-1G auxiliary contact; DYJ1 the action condition of the three-phase voltage monitoring relay is that when the three-phase voltage is less than the setting value U1, the DYJ1 relay judges that the bus voltage disappears, the normally closed contact is connected, and the normally open contact is disconnected; when one phase voltage of the three-phase voltage is greater than a setting value U2, the DYJ1 relay judges that the bus has voltage, the normally open contact of the bus is connected, and the normally closed contact of the bus is disconnected;

when the I mother PT is put into operation, the auxiliary contact of the isolating switch PT-1G is switched on, and at the moment, if the I mother PT secondary three phases are all normally put into operation, namely the I mother PT secondary circuit breaker 1DK is in an on position, the three-phase voltage monitoring relay DYJ1 judges that the I mother PT secondary has voltage, the DYJ1 normally open contact is closed, and the normally closed contact is opened; at the moment, if the I mother PT secondary three phases are not normally put into operation, namely the I mother PT secondary circuit breaker 1DK is in a separated position, but the II mother PT secondary three phases are normally put into operation, the bus PT parallel relay BLJ acts and the contact is switched on, the three-phase voltage monitoring relay DYJ1 judges that the I mother PT secondary has voltage, the DYJ1 normally open contact is closed, and the normally closed contact is opened;

when the I mother PT does not run, the auxiliary contact of the isolating switch PT-1G is disconnected, and if the I mother PT secondary circuit breaker 1DK is in an on position or in a off position, and the voltage access position of the three-phase voltage monitoring relay DYJ1 has no voltage, the three-phase voltage monitoring relay DYJ1 judges that the I mother PT secondary is free of voltage, the DYJ1 normally closed contact is closed, and the normally open contact is opened;

when the I bus PT is put into operation, the auxiliary contact of the isolating switch PT-1G is switched on, the I bus PT secondary circuit breaker 1DK is in an on position, when the bus is not connected with a power supply for the first time, the voltage connection position of the three-phase voltage monitoring relay DYJ1 does not have voltage, the three-phase voltage monitoring relay DYJ1 judges that the I bus PT secondary circuit does not have voltage, the DYJ1 normally closed contact is closed, and the normally open contact is opened;

DYJ2 is expressed as: the II bus PT three-phase voltage monitoring relay is characterized in that II bus PT secondary voltage is connected between an II bus PT secondary circuit breaker 2DK and an isolation switch PT-2G auxiliary contact of II bus PT; DYJ2 the action condition of the three-phase voltage monitoring relay is that when the three-phase voltage is less than the setting value U1, the DYJ2 relay judges that the bus voltage disappears, the normally closed contact is connected, and the normally open contact is disconnected; when one phase of three-phase voltage is greater than a setting value U2, the DYJ2 relay judges that the bus has voltage, and a normally open contact of the bus is connected and a normally closed contact of the bus is disconnected;

when the II mother PT is put into operation, the auxiliary contact of the isolating switch PT-2G is switched on, and if the II mother PT secondary three phases are normally put into operation, namely the II mother PT secondary circuit breaker 2DK is in an on position, the three-phase voltage monitoring relay DYJ2 judges that the I mother PT secondary has voltage, the DYJ2 normally open contact is closed, and the normally closed contact is opened; at the moment, if the II mother PT secondary three phases are not normally put into operation, namely the II mother PT secondary circuit breaker 2DK is in a separated position, but the I mother PT secondary three phases are normally put into operation, the bus PT parallel relay BLJ acts and the contact is switched on, the three-phase voltage monitoring relay DYJ2 judges that the II mother PT secondary has voltage, the DYJ2 normally open contact is closed, and the normally closed contact is opened;

when the II mother PT does not run, the auxiliary contact of the isolating switch PT-2G is disconnected, and if the II mother PT secondary circuit breaker 2DK is in an on position or in a off position, and the voltage access position of the three-phase voltage monitoring relay DYJ2 has no voltage, the three-phase voltage monitoring relay DYJ2 judges that the II mother PT secondary is free of voltage, the DYJ2 normally closed contact is closed, and the normally open contact is opened;

when the II mother PT is put into operation, the auxiliary contact of the isolating switch PT-2G is switched on, and the 2DK of the II mother PT secondary circuit breaker is in an on position, when the bus is not connected with a power supply for the first time, the voltage access position of the three-phase voltage monitoring relay DYJ2 has no voltage, the three-phase voltage monitoring relay DYJ2 judges that the II mother PT secondary is free of voltage, the DYJ2 normally closed contact is closed, and the normally open contact is opened;

when the bus PT parallel relay BLJ acts, the microcomputer five-prevention allows the operation of 'bus PT secondary disconnection' only when the three-phase voltage monitoring relays DYJ1 and DYJ2 of the two sections of buses judge that three phases have voltage or judge that three phases have no voltage.

8. The intelligent operation and maintenance-based bus voltage parallel loop according to claim 7, further comprising a first bus PT interval measurement and control device, a second bus PT interval measurement and control device and a bus coupler or section measurement and control device, wherein the bus coupler or section measurement and control device acquires states of a 1G auxiliary contact of the disconnecting switch, a 2G auxiliary contact of the disconnecting switch and an FDL auxiliary contact of a section or bus coupler circuit breaker, the first bus PT interval measurement and control device acquires first bus PT three-phase voltage information, first bus PT-1G auxiliary contact information and first bus PT three-phase voltage monitoring relay DYJ1 contact information, the second bus PT interval measurement and control device acquires second bus PT three-phase voltage information, second bus PT disconnecting switch PT-2G auxiliary contact information and second bus PT three-phase voltage monitoring relay DYJ2 contact information, first generating line PT interval measurement and control device, second generating line PT interval measurement and control device and mother ally oneself with or segmentation measurement and control device will acquire information on send to computer five prevention host computer, intelligent five prevention host computer and intelligent fortune dimension host computer, wherein:

the information acquisition and processing method of each device is as follows:

public measurement and control device:

the secondary remote operation permission signal of PT of the Utility bus is 11-12 contact points of the change-over switch QK, after the contact points are switched on, the public measurement and control device judges that the output is 'the secondary remote operation permission of PT of the bus', and after the contact points are switched off, the public measurement and control device judges that the output is 'the secondary remote operation prohibition of PT of the bus';

after the contact is connected, the public measurement and control device judges that the intelligent operation and maintenance system device replaces a change-over switch QK which artificially confirms that the primary device is normally switched on and bus PT secondary remote operation is allowed to be normally connected, and then the public measurement and control device judges that the intelligent operation and maintenance system device replaces a change-over switch QK which artificially confirms that the primary device is normally switched on and the bus PT secondary remote operation is allowed to be normally connected, and then the public measurement and control device outputs the intelligent operation and maintenance system device as bus PT secondary remote operation forbidden after the contact is disconnected;

bus-tie or segmentation measurement and control device:

the switching-on position signal of the 1G isolating switch in the Utility model or the subsection is a normally-open auxiliary contact of the 1G isolating switch auxiliary contact, after the contact is switched on, the subsection measurement and control device judges that the output is that the bus or the subsection 1G isolating switch is in a switching-on state, and after the contact is switched off, the subsection measurement and control device judges that the output is that the bus or the subsection 1G isolating switch is in a switching-off state;

the 1G isolating switch opening position signal of the Uighur bus coupler or the subsection 1G isolating switch is a normally closed auxiliary contact of a 1G isolating switch auxiliary contact, after the contact is connected, the subsection measurement and control device judges that the output is that a bus or the subsection 1G isolating switch is in an opening state, and after the contact is disconnected, the subsection measurement and control device judges that the output is that the bus or the subsection 1G isolating switch is in a closing state;

the switching-on position signal of the Customs-gang or segmented 2G isolating switch is a '2G isolating switch auxiliary contact' normally-open auxiliary contact, after the contact is switched on, the segmented measurement and control device judges that the output is 'the bus or the segmented 2G isolating switch is in a switching-on state', and after the contact is switched off, the segmented measurement and control device judges that the output is 'the bus or the segmented 2G isolating switch is in a switching-off state';

the switch-off position signal of the Customs-gang or segmented 2G isolating switch is a normally closed auxiliary contact of a 2G isolating switch auxiliary contact, after the contact is switched on, the segmented measurement and control device judges that the output is that a bus or a segmented 2G isolating switch is in a switch-off state, and after the contact is switched off, the segmented measurement and control device judges that the output is that the bus or the segmented 2G isolating switch is in a switch-on state;

female PT interval measurement and control device of I:

the PT three phases of the I bus have voltage signals, which are normally open contacts of an I bus PT three-phase voltage monitoring relay DYJ1, after the contacts are switched on, the I bus PT measurement and control device judges that the output is the I bus PT three-phase voltage, and after the contacts are switched off, the I bus PT measurement and control device judges that the output is the I bus PT three-phase voltage;

the closing signal of the PT isolating switch of the I bus is a normally open auxiliary contact of a closing auxiliary contact PT-1G of the PT isolating switch of the I bus, after the contact is closed, the PT measuring and controlling device of the I bus judges that the output is that the PT isolating switch of the I bus is in the putting position, and if the secondary open and close signals of the I bus are effective, the PT three phases of the I bus are judged to have voltage; after the contact is disconnected, the I bus PT measurement and control device judges that the output is that the I bus PT isolating switch is in an exit state, and then the I bus PT three-phase is judged to have no voltage;

the I bus PT isolating switch potential dividing signal is a normally closed auxiliary contact of an I bus PT isolating switch PT-1G potential dividing auxiliary contact, and after the contact is switched on, the I bus PT measuring and controlling device judges that the output is that the I bus PT isolating switch is in an exit state, and then judges that all three phases of the I bus PT are voltage-free; after the contact is disconnected, the I bus PT measurement and control device judges that the output is that the I bus PT isolating switch is in the input position, and if the secondary idle opening of the bus is effective in the on-position signal, the I bus PT three-phase voltage is judged;

the PT secondary three-phase air switches of the I bus are all in the on-position signals, which are normally open auxiliary contacts of normally open auxiliary contact series signals of all air switches of the PT secondary air switches of the I bus, and after the contacts are switched on, the PT measuring and controlling device of the I bus judges that the output signals are effective when the PT secondary three-phase air switches of the I bus are all in the on-position signals; after the contact is disconnected, the I bus PT measurement and control device judges that the output signals are invalid when the I bus PT secondary three-phase air switches are both in the on-position state;

after the contact is connected, the I bus PT measurement and control device judges that the output is that all the air switches of the I bus PT secondary are in exit state; after the contact is disconnected, the I bus PT measurement and control device judges that the output signals of all the secondary air switches of the I bus PT are invalid in the position dividing signals;

II, mother PT interval measurement and control device:

PT three phases of II bus have voltage signal, it is "PT three-phase voltage of II bus monitors the normally open contact of relay DYJ 2", after the contact is put through, the female PT measuring and controlling device of II judges that the output is "PT three phases of II bus have voltage", after the contact is broken, the female PT measuring and controlling device of II judges that the output is "PT three phases of II bus have no voltage";

PT three phases of II bus have no voltage signal, and the PT three-phase voltage monitoring relay DYJ2 is a normally closed contact, after said contact is switched on, the PT measuring and controlling device of II bus can judge that the output is "PT three phases of II bus have no voltage", and after said contact is switched off, the PT measuring and controlling device of II bus can judge that the output is "PT three phases of II bus have voltage";

the PT isolating switch on-position signal of II bus is a normally open auxiliary contact of 'PT-2G on-position auxiliary contact of II bus PT isolating switch', after said contact is switched on, the PT measuring and controlling device of II bus can judge that the output is that the PT isolating switch of II bus is in the input position, if the secondary idle opening of said bus is effective in on-position signal, it can judge that 'PT three-phase of II bus has voltage'; after the contact is disconnected, the II bus PT measurement and control device judges that the output is that the II bus PT isolating switch is in an exit state, and then the II bus PT three-phase is judged to have no voltage;

II bus PT secondary three-phase air switches are all in on-position signals, which are normally open auxiliary contacts of normally open auxiliary contact series signals of all air switches of II bus PT secondary, after the contacts are switched on, the II bus PT measurement and control device judges that the output signals are effective when the II bus PT secondary three-phase air switches are all in on-position signals; after the contact is disconnected, the II bus PT measurement and control device judges that the output signals are invalid when the II bus PT secondary three-phase air switches are both in the on-position state;

II bus PT secondary three-phase air switches are all in a position-dividing signal, namely a normally closed auxiliary contact of a normally closed auxiliary contact series signal of all air switches of II bus PT secondary, after the contact is connected, the II bus PT measurement and control device judges that output is that all air switches of II bus PT secondary are in an exit state; after the contact is disconnected, the II bus PT measurement and control device judges that the output signals of II bus PT secondary air switches are invalid in the position dividing signals;

the five-prevention blocking logic of the opening microcomputer of the control loop of the bus-coupled or sectional circuit breaker is as follows:

when the information that the bus PT secondary change-over switch QK is in the allowed parallel position is obtained by the microcomputer five-prevention host machine through the public measurement and control device through the Ethernet, the next judgment is carried out; when the information that the bus PT secondary transfer switch QK is in the allowed parallel position obtained by the microcomputer five-prevention host computer through the Ethernet by the public measurement and control device is not satisfied, judging that the switching-off operation condition of the sectionalized breaker is forbidden to be satisfied, and restarting the judgment;

the next step is: when the information that the bus PT secondary in-parallel signal is obtained by the microcomputer five-prevention host machine through the Ethernet by the public measurement and control device is established, the next judgment is carried out; when the information that the bus PT secondary in-parallel signal acquired by the microcomputer five-prevention host through the Ethernet by the public measurement and control device is not true, judging that the operation condition for forbidding the opening of the sectional breaker is not met, and restarting the judgment;

the next step is: when the microcomputer five-prevention host machine obtains the information that the PT three phases of the I bus have all voltage through the I bus PT interval measurement and control device by the Ethernet, the microcomputer five-prevention host machine judges that the switching-off operation of the segmented circuit breaker is forbidden, and if the information that the PT three phases of the I bus have all voltage is obtained, the microcomputer five-prevention host machine judges the next step;

the next step is: when the microcomputer five-prevention host machine obtains the information of II bus PT three-phase all voltage from the II bus PT interval measurement and control device through the Ethernet, the microcomputer five-prevention host machine judges that the switching-off operation of the sectional breaker is forbidden, if the information of II bus PT three-phase all voltage is obtained, the judgment is restarted when the switching-off operation condition of the sectional breaker is forbidden to be met;

the closing microcomputer of the control loop of the bus-coupled or sectional circuit breaker is a five-prevention locking logic:

the next step is: when the microcomputer five-prevention host machine obtains 'the sectional breaker is located at a switching-on position signal' information through the Ethernet by the sectional measurement and control device, judging that the switching-on operation condition of the sectional breaker is forbidden to be met, and restarting the judgment; if the 'signal that the sectional breaker is located at the opening position' is obtained, judging that the closing operation of the sectional breaker is forbidden;

the bus PT secondary allows the parallel microcomputer five-prevention locking logic:

when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire information that the bus PT secondary selector switch QK is at the allowable splitting position through the Ethernet by the public measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the information that the bus PT secondary selector switch QK is at the allowable parallel position is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'sectional interval 2G disconnecting switch on-off position signal' through the Ethernet by the sectional measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the 'sectional interval 2G disconnecting switch on-off position signal' is acquired, judging that the bus PT secondary parallel operation is allowed;

and the bus PT secondary permission splitting microcomputer five-prevention locking logic:

when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information that the bus PT secondary selector switch QK is at the allowable parallel position through the Ethernet by the public measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the information that the bus PT secondary selector switch QK is at the allowable parallel position is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'position signal of the segmented circuit breaker at the opening' through the Ethernet by the segmented measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the 'position signal of the segmented circuit breaker at the closing' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'on-off position signal of the sectionalized interval 1G isolating switch' through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the 'on-off position signal of the sectionalized interval 1G isolating switch' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host acquire the information of the 'on-off position signal of the sectionalized interval 2G isolating switch' through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the 'on-off position signal of the sectionalized interval 2G isolating switch' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information meeting the requirement that the three phases of the I bus PT are all provided with pressure through the I bus PT interval measurement and control device through the Ethernet, carrying out next judgment;

when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information that the PT three phases of the I bus are all pressed, which does not meet the requirement, from the PT interval measurement and control device of the I bus through the Ethernet, the next judgment is carried out; on the other hand, if the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information that the condition that the three phases of the I bus PT are all no voltage is not met through the I bus PT interval measurement and control device by the Ethernet, the disconnection condition is judged to be not met, and the program returns to restart the judgment; on the other hand, if the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information meeting the requirement that the three phases of the bus PT are all no voltage through the bus PT interval measurement and control device by the Ethernet, the next judgment is carried out, namely the judgment that the three phases of the bus PT are all no voltage is carried out;

when the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information that the condition that the pressure of the PT three phases of the II bus is not satisfied by the PT interval measurement and control device of the II bus through the Ethernet, carrying out next judgment; on the other hand, if the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information that the condition that the PT three phases of the II bus are not pressure-equalized through the II bus PT interval measurement and control device by the Ethernet, the disconnection condition is judged to be not met, and the program returns to restart the judgment; on the other hand, if the intelligent five-prevention host, the intelligent operation and maintenance host and the microcomputer five-prevention host obtain judgment information meeting the requirement that the three phases of the II bus PT are all no voltage through the II bus PT interval measurement and control device through the Ethernet, the judgment output allows the bus PT secondary splitting operation.

9. The intelligent operation and maintenance-based bus voltage parallel loop as claimed in claim 8, further comprising an intelligent five-prevention host, wherein the 9 contact of the transfer switch QK is electrically connected with one end of the microcomputer five-prevention lock BS, the 10 contact of the transfer switch QK is electrically connected with the other end of the microcomputer five-prevention lock BS, the 13 contact of the transfer switch QK is electrically connected with the other end of the isolation switch 2G auxiliary contact, the 14 contact of the transfer switch QK is electrically connected with one end of the ZNBL normally open contact of the common measurement and control device and one end of the ZNJL normally open contact of the common measurement and control device respectively, the other end of the ZNBL normally open contact of the common measurement and control device is electrically connected with one end of the start coil of the bus PT parallel relay BLJ, and the other end of the ZNJL normally open contact of the common measurement and control device is electrically connected with the other end of the return coil of the bus PT parallel relay BLJ;

the connection state of the 11 contact and the 12 contact of the change-over switch QK is the same as that of the 9 contact and the 10 contact, and the 13 contact and the 14 contact of the change-over switch QK, and the public measurement and control device uploads the connection state of the change-over switch QK to the intelligent five-prevention host;

when the sectional or bus tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are all in the on position, the fact that the I section bus and the II section bus in the primary electrical system are parallel is shown, at the moment, the sectional or bus tie breaker on position auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are all in the on state, and the loop can perform bus PT secondary parallel;

if the switch QK is switched to the position of allowing remote operation, namely allowing the remote parallel contacts to be connected, and when the switch QK is switched to the position of allowing remote operation, the 9-10 contacts, the 13-14 contacts and the 11-12 contacts of the switch QK are all in a connected state; after the 11-12 contacts of the change-over switch QK are connected, the public measurement and control device transmits the information of the connection of the 11-12 contacts of the change-over switch QK to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; if the intelligent judgment result of the intelligent operation and maintenance system indicates that the switching-on of the primary equipment at the interval of the subsections is normal, the output normally-open contact of the intelligent operation and maintenance system intelligently judges that the switching-on of the primary equipment is normal is connected and is connected to the public measurement and control device, and the public measurement and control device judges that the intelligent operation and maintenance system equipment replaces the manual confirmation that the switching-on of the primary equipment is normal and sends the information that the switching-on of the primary equipment is normal to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; meanwhile, after the FDL auxiliary contact of the sectional or bus-coupled circuit breaker, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are connected, the sectional or bus-coupled circuit breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are connected, and information of the connection of the sectional or bus-coupled circuit breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact is sent to the intelligent five-prevention host and the intelligent operation and maintenance host through a network by the measurement and control device; the intelligent five-prevention host and the intelligent operation and maintenance host receive the information and then judge that: the primary system has paralleled the buses, and the intelligent operation and maintenance substitute human to confirm that the primary buses are paralleled normally and switch the change-over switch to the position of allowing remote operation, so that the secondary intelligent paralleling of the buses PT can be allowed; at the moment, if the upper intelligent operation and maintenance system judges that the remote intelligent paralleling is allowed and sends a 'bus PT secondary intelligent paralleling' task order to the intelligent operation and maintenance host machine of the transformer substation through the communication network, the intelligent operation and maintenance host machine of the transformer substation judges that the intelligent paralleling is allowed and applies for the judgment to the intelligent five-prevention host machine in the transformer substation and allows the 'bus PT secondary intelligent paralleling', the intelligent five-prevention host machine sends 'bus PT secondary intelligent paralleling' information to the intelligent operation and maintenance host machine according to the judgment results, the intelligent operation and maintenance host machine informs the public measurement and control device through the network to start the ZNBL relay to output an 'I-II bus remote intelligent paralleling' contact, when the public measurement and control device starts the ZNBL relay to enable the 'I-II bus PT secondary intelligent paralleling' contact to be connected, the negative power supply starts a coil, the remote intelligent paralleling contact via the bus PT BLJ relay, the ZNBL contact, 13-14 contact of the switch QK, 2G closing auxiliary contact, FDL closing auxiliary contact, 1G closing auxiliary contact and 9-10 contact of the switch QK are connected with the positive power supply, and the 'bus PT parallel relay BLJ' acts to realize secondary remote intelligent parallel of the buses PT of the intelligent operation and maintenance system;

after the bus PT parallel relay BLJ acts, on one hand, the relay BLJ is provided with 8 normally open contacts BLJ-1 to BLJ-8 to be switched on, so that the parallel function of different voltage windings of the bus PT is realized; on the other hand, the bus PT parallel relay BLJ has 1 normally open auxiliary contact BLJ-9, the auxiliary contact BLJ-9 is connected and connected with the public measurement and control device, the public measurement and control device obtains the information of 'secondary parallel middle of bus PT', and sends the information to the intelligent five-prevention host and the intelligent operation and maintenance host and the superior intelligent operation and maintenance system, after the intelligent five-prevention host and the intelligent operation and maintenance host obtain the information, the secondary of bus PT is judged to be forbidden to 'jump off the section switch' in parallel, at this time, if the superior intelligent operation and maintenance system forbids to send 'jump off the section switch' task command to the intelligent operation and maintenance host of the transformer substation through the communication network, the intelligent operation and maintenance host of the transformer substation forbids to apply the judgment and allow 'jump off the section switch', the intelligent five-prevention host judges and sends a 'trip signal of a forbidding sectional switch' to the intelligent five-prevention host, namely, the function of forbidding the trip operation of the intelligent operation and maintenance system of the sectional breaker is realized through multiple locking, and the requirements of high reliability for preventing errors and attacks are met;

when the bus PT parallel relay BLJ acts, the bus PT parallel relay BLJ is provided with 2 normally open auxiliary contacts BLJ-12 which are communicated with BLJ-13 contacts, and is connected with a loop which is used for respectively realizing the tripping 1 of the blocking sectional breaker and the tripping 2 of the blocking sectional breaker through the normally open contacts; on the other hand, the bus PT parallel relay BLJ is provided with 2 normally closed auxiliary contacts BLJ-14 which are disconnected with BLJ-15 contacts, and is connected into a loop for respectively realizing the tripping 1 and the tripping 2 of the blocking section breaker through the disconnection of the normally closed contacts;

when the bus PT parallel relay BLJ acts, the bus PT parallel relay BLJ is provided with 2 normally open auxiliary contacts BLJ-10 which are connected with BLJ-11 contacts and respectively connected with a power supply air switch for respectively realizing the tripping of a sectionalized interval circuit breaker control circuit 1 and a power supply air switch for respectively realizing the tripping of a sectionalized interval circuit breaker control circuit 2 through the normally open contacts; tripping the sectionalized interval circuit breaker to control the air switch of the circuit power supply, so that the circuit breaker control circuit is powered off, and the purpose of locking the sectionalized circuit breaker to open the brake is realized;

when the sectionalized or bus-coupled circuit breaker, the isolating switch 1G auxiliary contact and the isolating switch 2G auxiliary contact are all in the closed position, the condition that the I section bus and the II section bus in the primary electrical system are parallel is shown, at the moment, the sectionalized or bus-coupled circuit breaker closed position auxiliary contact, the isolating switch 1G auxiliary contact and the isolating switch 2G auxiliary contact are all in the connected state, and the loop can carry out the secondary parallel-disconnection operation of a bus PT;

if the switch QK is switched to the position of allowing remote operation, namely allowing the remote parallel contacts to be connected, and when the switch QK is switched to the position of allowing remote operation, the 9-10 contacts, the 13-14 contacts and the 11-12 contacts of the switch QK are all in a connected state; after the 11-12 contacts of the change-over switch QK are connected, the public measurement and control device transmits the information of the connection of the 11-12 contacts of the change-over switch QK to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; if the intelligent judgment result of the intelligent operation and maintenance system is that the section interval primary equipment is normally switched on, the output normally open contact of the intelligent operation and maintenance system intelligently judges that the primary equipment is normally switched on is connected and is connected to the common measurement and control device, and the common measurement and control device judges that the intelligent operation and maintenance system replaces the manual confirmation that the primary equipment is normally switched on and sends the information that the primary equipment is normally switched on to the intelligent five-prevention host and the intelligent operation and maintenance host through the network; meanwhile, after the sectional or bus-tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact are connected, the sectional or bus-tie measurement and control device transmits information of the connection of the sectional or bus-tie breaker FDL auxiliary contact, the disconnecting switch 1G auxiliary contact and the disconnecting switch 2G auxiliary contact to an intelligent five-prevention host computer for 'carrying out sectional switch tripping' task order through a network; the intelligent five-prevention host computer carries out the task of 'jumping off the section switch', and after receiving the information, the task is judged as follows: the intelligent operation and maintenance substitute human confirms that the primary buses are in parallel and normal and switches the selector switch to the position allowing remote operation, so that the secondary intelligent disconnection of the bus PT can be allowed; at the moment, if the superior intelligent operation and maintenance system judges that the secondary intelligent disconnection of the bus PT can be allowed and sends a task command of 'performing secondary intelligent disconnection of the bus PT' to the intelligent operation and maintenance host computer of the transformer substation through the communication network, the intelligent operation and maintenance host computer of the transformer substation judges that the secondary intelligent disconnection of the bus PT can be allowed and applies for judgment to the intelligent five-prevention host computer in the transformer substation and allows the secondary intelligent disconnection of the bus PT, therefore, the intelligent five-prevention host computer sends information of 'allowing secondary intelligent disconnection of the bus PT' to the intelligent operation and maintenance host computer according to the judgment results, the intelligent operation and maintenance host computer informs the public measurement and control device through the network that the ZNJL relay can be started to output a 'I-II remote intelligent disconnection' junction, and when the public measurement and control device starts the ZNJL relay to enable the 'I-II remote intelligent disconnection' junction to be connected, the negative power supply returns to the disconnection coil through the bus PT parallel BLJ, ZNJL relay contact, 13-14 contact of the transfer switch QK, 2G closing auxiliary contact, FDL closing auxiliary contact, 1G closing auxiliary contact and 9-10 contact of the transfer switch QK are connected to a positive power supply, and the bus PT parallels the action of the relay BLJ to realize secondary remote intelligent disconnection of the bus PT of the intelligent operation and maintenance system, namely the secondary remote intelligent disconnection operation function of the bus PT is realized through multiple judgments, and the requirements of high reliability for preventing errors and attacks are met;

after the bus PT parallel relay BLJ returns, on one hand, the relay BLJ has 8 normally open contacts BLJ-1 to BLJ-8 to be disconnected, and the splitting function of different voltage windings of the bus PT is realized; on the other hand, the bus PT parallel relay BLJ is provided with 1 normally-open auxiliary contact BLJ-9, the auxiliary contact BLJ-9 is disconnected and connected into a public measurement and control device, the public measurement and control device obtains information that bus PT secondary is split, the information is uploaded to an intelligent five-prevention host and an intelligent operation and maintenance host, the intelligent five-prevention host and the intelligent operation and maintenance host judge that the bus PT secondary is split and do not prohibit 'section switch tripping' after obtaining the information, at the moment, the intelligent five-prevention host and the intelligent operation and maintenance host judge that the bus PT secondary is not in parallel and do not prohibit 'section switch tripping' when judging that the bus PT secondary is not in parallel by a superior intelligent operation and maintenance system and sending 'section switch tripping' task command to the intelligent operation and maintenance host of the transformer substation through a communication network, the intelligent operation and maintenance host of the transformer substation judges that the bus secondary is not in parallel and applies for judgment and permits 'section switch tripping' to the intelligent five-prevention host in the transformer substation " When the intelligent five-prevention operation and maintenance host machine permits, the intelligent five-prevention host machine judges and sends an 'forbidden section switch tripping signal' to the intelligent five-prevention operation and maintenance host machine, namely, the tripping operation of the intelligent operation and maintenance system of the section breaker can be realized;

after the bus PT parallel relay BLJ returns, the bus PT parallel relay BLJ has 2 normally open auxiliary contacts BLJ-10 and BLJ-11 contacts to be disconnected, the power supply air switch of the sectionalized interval circuit breaker control circuit 1 and the power supply air switch of the sectionalized interval circuit breaker control circuit 2 can not be respectively tripped through the normally open contact, and the purpose of shutting the sectionalized circuit breaker by tripping the power supply air switch of the sectionalized interval circuit breaker control circuit can not be achieved.

10. The intelligent operation and maintenance-based bus voltage parallel loop according to claim 9, further comprising an intelligent operation and maintenance host and a superior intelligent operation and maintenance system, wherein information collected by the common measurement and control device, the bus tie or segmented measurement and control device, the first bus PT interval measurement and control device and the second bus PT interval measurement and control device is transmitted to the intelligent five-prevention host and the intelligent operation and maintenance host through an in-station Ethernet; the intelligent five-prevention host is connected with the intelligent operation and maintenance host through the Ethernet in the station, so that the intelligent five-prevention judgment and permission of the control command of the intelligent operation and maintenance host are realized, and the control command of the intelligent operation and maintenance host can be sent to a corresponding device in the station only after the permission of the intelligent five-prevention host; the intelligent operation and maintenance host is connected with the superior intelligent operation and maintenance system through a special communication interface and a special network channel, receives the control command of the superior intelligent operation and maintenance system operator on one hand, and feeds back the control operation result to the superior intelligent operation and maintenance system on the other hand, and the method specifically comprises the following steps:

the separating brake intelligent five-prevention locking logic and the intelligent operation and maintenance anti-misoperation logic of the bus-coupled or segmented circuit breaker control circuit:

when the information that the bus PT secondary change-over switch QK is at the remote operation position allowed by the intelligent five-prevention host computer is established, the intelligent five-prevention host computer carries out next judgment through the public measurement and control device via the Ethernet; when the information that the bus PT secondary transfer switch QK is at the remote operation position allowed by the intelligent five-prevention host computer is not established, the intelligent five-prevention host computer judges that the operation condition for switching off the segmented circuit breaker by the intelligent operation and maintenance system is forbidden is not met, and starts judging again;

the next step is: when the information of 'signals of the bus PT in parallel for the second time' is obtained by the public measurement and control device through the Ethernet, the intelligent five-prevention host and the intelligent operation and maintenance host carry out the next judgment; when the information that the signals of the bus PT secondary in parallel acquired by the intelligent five-prevention host and the intelligent operation and maintenance host through the Ethernet by the public measurement and control device is not true, judging that the operation condition for switching off the segmented circuit breaker by the intelligent operation and maintenance system is forbidden is not met, and restarting the judgment;

the next step is: when the microcomputer five-prevention host and the intelligent operation and maintenance host acquire the information that the PT three phases of the I bus have all voltage through the I bus PT interval measurement and control device through the Ethernet, the operation of opening the section breaker is judged to be forbidden, and if the information that the PT three phases of the I bus have all voltage is acquired, the next judgment is carried out;

the next step is: when the microcomputer five-prevention host and the intelligent operation and maintenance host obtain the information that the PT three phases of the II bus are all provided with voltage through the II bus PT interval measurement and control device through the Ethernet, the operation of opening the section breaker is judged to be forbidden, if the information that the PT three phases of the II bus are all provided with voltage is obtained, the operation condition that the section breaker is forbidden to be opened is judged to be not met, and the judgment is restarted;

when the system change-over switch QK is switched to a 'bus PT secondary change-over switch QK is at a position allowing remote operation', when the bus tie or the sectionalized interval isolating switch and the circuit breaker are in a closed position, the bus PT secondary parallel cannot be automatically carried out by mistake, so that an intelligent five-prevention system is not used for carrying out closing locking and corresponding judgment on the bus tie or the sectionalized interval circuit breaker;

when the information that the bus PT secondary change-over switch QK is at the position allowing remote operation is not obtained by the intelligent five-prevention host and the intelligent operation and maintenance host through the Ethernet by the public measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the information that the bus PT secondary change-over switch QK is at the position allowing remote operation is obtained, judging the next step;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'signal of the disconnecting switch at the opening position at the sectional interval 1G' by the sectional measurement and control device through the Ethernet, judging that the parallel condition is not met, restarting the judgment, and if the 'signal of the disconnecting switch at the closing position at the sectional interval 1G' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'sectional interval 2G disconnecting switch on-off position signal' through the Ethernet by the sectional measurement and control device, judging that the parallel condition is not met, restarting the judgment, and if the 'sectional interval 2G disconnecting switch on-off position signal' is acquired, performing the next judgment;

the intelligent five-prevention host and the intelligent operation and maintenance host acquire information that the bus PT secondary selector switch QK is at the remote operation allowed position from the public measurement and control device through the Ethernet, judge that the splitting condition is not satisfied, restart the judgment, and perform the next judgment if the information that the bus PT secondary selector switch QK is at the remote operation allowed position is obtained;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the position signal of the sectionalized circuit breaker at the opening through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the position signal of the sectionalized circuit breaker at the closing position is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'signal of the disconnecting switch at the opening position at the sectional interval 1G' by the sectional measurement and control device through the Ethernet, judging that the disconnection condition is not met, restarting the judgment, and if the 'signal of the disconnecting switch at the closing position at the sectional interval 1G' is acquired, performing the next judgment;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host acquire the information of the 'signal of the sectionalized gap 2G isolating switch at the opening position' through the Ethernet by the sectional measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the 'signal of the sectionalized gap 2G isolating switch at the closing position' is acquired, performing the next judgment;

the next step is: when the information that the intelligent operation and maintenance system intelligently judges that the primary equipment at the interval of the subsections is normally switched on is obtained by the intelligent operation and maintenance system through the public measurement and control device through the Ethernet, the parallel condition is judged to be not satisfied, the judgment is restarted, and if the information that the intelligent operation and maintenance system intelligently judges that the primary equipment at the interval of the subsections is normally switched on is obtained, the next judgment is carried out;

the next step is: when the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information meeting the requirement that the PT three phases of the II bus have all pressure through the II bus PT interval measurement and control device by the Ethernet, judging that the output allows the secondary splitting operation of the bus PT;

when the intelligent five-prevention host and the intelligent operation and maintenance host obtain judgment information that the pressure of the PT three phases of the I bus is not satisfied by the PT interval measurement and control device of the I bus through the Ethernet, carrying out next judgment; on the other hand, if the judgment information that the three phases of the I bus PT are not equal to the voltage is not met is obtained by the I bus PT interval measurement and control device through the Ethernet in the aspects of an intelligent five-prevention host and an intelligent operation and maintenance host, the disconnection condition is judged to be not met, and the program returns to restart the judgment; on the other hand, if the judgment information that the three phases of the bus PT are equal to or less than the voltage of the bus I is obtained by the bus I PT interval measurement and control device through the Ethernet in the manner of an intelligent five-prevention host and an intelligent operation and maintenance host, the next judgment is carried out, namely the judgment that the three phases of the bus PT are equal to or less than the voltage of the bus II is carried out;

when the judgment information that the PT three phases of the II bus are all pressed is not satisfied is obtained by the PT interval measurement and control device of the II bus through the Ethernet, the next judgment is carried out; on the other hand, if the judgment information that the PT three phases of the II bus are not uniformly pressurized is obtained by the PT interval measurement and control device of the II bus through the Ethernet in the aspects of an intelligent five-prevention host and an intelligent operation and maintenance host, the disconnection condition is judged not to be satisfied, and the program returns to restart the judgment; on the other hand, if the judgment information that the 'II bus PT three-phase equal voltage is met' is obtained by the II bus PT interval measurement and control device through the Ethernet by the 'intelligent five-prevention host' and the 'intelligent operation and maintenance host', the judgment output allows the bus PT secondary splitting operation.