CN213547100U - Bus voltage parallel loop based on intelligent operation and maintenance - Google Patents

Abstract

The utility model discloses a busbar voltage parallel circuit based on intelligence fortune dimension, this return circuit is by higher level's intelligence fortune dimension system, intelligence fortune dimension host computer, intelligence five prevent the host computer, the host computer is prevented five to the computer, measurement and control device, the five coding locks BS of preventing of computer, change over switch QK, segmentation or mother ally oneself with circuit breaker closed position auxiliary contact, first isolator normally opens auxiliary contact 1G, second isolator normally opens auxiliary contact 2G, generating line PT parallel relay BLJ, first isolator normally closes auxiliary contact 3G, second isolator normally closes auxiliary contact 4G, segmentation or mother ally oneself with circuit breaker normally closed auxiliary contact FDL2, unusual verifier YCJ and unusual verifier YCJ contact are constituteed. The bus PT parallel relay BLJ is a double-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 energized, the relay returns to and remains in the return state. The utility model discloses can prevent that power decompression generating line PT secondary from splitting by mistake.

Description

Bus voltage parallel loop based on intelligent operation and maintenance

Technical Field

The utility model relates to an electric power system protection technical field, more specifically relates to a busbar voltage parallel circuit based on intelligence fortune dimension.

Background

A 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, and then connect it to the devices of protection, measurement and control, safety device, instrument and meter to make collection or measurement. The primary voltage of a voltage transformer is generally set to 57.7 volts or 100 volts regardless of the voltage of the primary side, and the secondary voltage is generally set to supply the voltage required by a voltage coil of an automatic device such as a related meter and 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 guaranteed.

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 of one section of bus to be out of operation when the bus PT is abnormal or in fault or needs to be maintained and repaired, so that a voltage signal of the section of bus is lost, the bus voltage parallel device is used for enabling a bus PT secondary of another section of bus to be in parallel connection with the bus PT secondary of the section of bus, the bus voltage parallel device is used for supplying the voltage of the other section of bus to secondary equipment connected with the bus section, and therefore the equipment using the bus PT secondary voltage can work normally. 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 is parallelly connected, namely, the disconnecting switch and the breaker of the bus coupler or the sectionalized interval are closed to ensure the reliable connection of the two buses, then the bus coupler or the sectionalized interval protection tripping pressing plate is withdrawn, and then the bus PT secondary parallel handle is switched to the parallel position to realize the 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: there are two cases:

the first method comprises the following steps: firstly, confirming that two sections of buses PT in parallel are all in the input position once, confirming that a system is in a parallel state, namely, a bus-coupled or sectionalized isolating 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 short-circuit impedance per unit 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 to be 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:

the bus voltage parallel starting circuit has no forced locking measure, a primary bus can be disconnected from parallel at any time without being limited by whether the secondary PT of the bus is in parallel or not, obvious defects exist, the operation condition that the normal operation procedure of bus PT parallel disconnection does not meet is frequently generated, and hidden danger is brought to safe and stable power supply of a power system; and secondly, when the bus voltage secondary circuit is in a parallel state, the tripping circuit of the corresponding bus-tie or sectionalized interval circuit breaker is not forcibly locked, and the tripping pressing plate is manually disconnected only by a management mode, so that the risk that the primary parallel circuit is disconnected firstly when a primary system fault occurs, and then the bus voltage secondary parallel circuit is disconnected, and the secondary equipment and the circuit are burnt by short-circuit current is caused. And thirdly, when the actions of the first disconnecting switch, the second disconnecting switch and the FDL auxiliary contact of the circuit breaker are abnormal in bus coupling or sectional interval, the secondary circuit of the bus voltage cannot be automatically prevented from being started and paralleled.

SUMMERY OF THE UTILITY MODEL

The utility model provides a busbar voltage side by side return circuit based on intelligence fortune dimension prevents the defect that generating line PT mistake parallels.

In order to solve the technical problem, the technical scheme of the utility model as follows:

a bus voltage parallel loop based on intelligent operation and maintenance comprises a microcomputer five-prevention lock BS, a microcomputer five-prevention host, a first isolating switch normally-open auxiliary contact 1G, a second isolating switch normally-open auxiliary contact 2G, a transfer switch QK, a segmented or bus-coupled breaker normally-open auxiliary contact FDL1, a bus PT parallel relay BLJ, a first isolating switch normally-closed auxiliary contact 3G, a second isolating switch normally-closed auxiliary contact 4G, a segmented or bus-coupled breaker normally-closed auxiliary contact FDL2, an abnormity verifier YCJ and an abnormity verifier YCJ contact, wherein the bus PT parallel relay BLJ is a double-position relay and comprises a starting coil and a return coil; when only return coil circular telegram back, bus PT parallel relay BLJ returns and keeps returning the state, and first bus is successively through first isolator normally open auxiliary contact 1G, segmentation or bus tie circuit breaker normally open auxiliary contact FDL1 and second isolator normally open auxiliary contact 2G and second bus are parallel to each other, wherein:

the first end of the five-prevention microcomputer locking BS is connected with a positive power supply, the second end of the five-prevention microcomputer locking BS is electrically connected with one end of a normally-open auxiliary contact 1G of a first isolating switch, the other end of the normally-open auxiliary contact 1G of the first isolating switch is electrically connected with one end of a normally-open auxiliary contact FDL1 of a sectional or bus-coupled circuit breaker, the other end of the normally-open auxiliary contact FDL1 of the sectional or bus-coupled circuit breaker is electrically connected with one end of a normally-open auxiliary contact 2G of a second isolating switch, the other end of the normally-open auxiliary contact 2G of the second isolating switch 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 second end of the microcomputer five-prevention lock BS is respectively connected with one end of a first isolating switch normally-closed auxiliary contact 3G, one end of a second isolating switch normally-closed auxiliary contact 4G and one end of a sectional or bus-coupled breaker normally-closed auxiliary contact FDL2, the other end of the first isolating switch normally-closed auxiliary contact 3G, the other end of the second isolating switch normally-closed auxiliary contact 4G and the other end of a sectional or bus-coupled breaker normally-closed auxiliary contact FDL2 are electrically connected with a 15 contact of a selector switch QK, a 16 contact of the selector switch QK is electrically connected with an abnormality verifier YCJ and then connected with a negative power supply, and the contact of the abnormality verifier YCJ is connected between a 2 contact of the selector switch QK and a starting coil of a bus-coupled parallel relay BLJ;

the utility model discloses a five protection microcomputer host computer, including change over switch QK, common measurement and control device is put through to change over switch QK's 5 contact and 6 contact, the on-state of change over switch QK's 5 contact and 6 contact is the same with the on-state of change over switch QK's 1 contact and 2 contact, common measurement and control device is with the on-state of change over switch QK and is sent the five protection microcomputer host computer.

Preferably, the five-prevention handheld key also 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, and the normally open contact BLJ-9 is connected and connected into a common measurement and control device.

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 sectionalized interval circuit breaker control circuit 1 and a power supply air switch for respectively realizing the tripping of the sectionalized 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 second isolator normally-open auxiliary contact 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 the public measurement and control device of 8 contact switch-on of change over switch QK, the on-state of 7 contacts and the 8 contacts of change over switch QK is the same with the on-state of 3 contacts and 4 contacts of change over switch QK, public 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, still include 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, mother ally oneself with or segmentation measurement and control device acquires the state that first isolator normally opens auxiliary contact 1G, second isolator normally opens auxiliary contact 2G and segmentation or mother and ally oneself with circuit breaker normally opens auxiliary contact FDL1, first generating line PT interval measurement and control device acquires first generating line PT three-phase voltage information and first generating line PT isolator PT-1G auxiliary contact information and first generating line PT three-phase voltage monitor relay DYJ1 contact information, second generating line PT interval measurement and control device acquires second generating line PT three-phase voltage information and second generating line PT isolator PT-2G auxiliary contact information and second generating line PT three-phase voltage monitor 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 and send the information that acquires to microcomputer five prevent to prevent that five are connected to Host computer, intelligent five prevent host computer and intelligent fortune dimension host computer.

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 normally-open auxiliary contact 2G of the second isolating switch, a 14 contact of the change-over switch QK is electrically connected with one end of the normally-open contact ZNBL of the common measurement and control device and one end of the normally-open contact ZNJL of the common measurement and control device respectively, the other end of the normally-open contact ZNBL of the common measurement and control device is electrically connected with one end of the starting coil of the bus PT parallel relay BLJ, and the other end of the normally;

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 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, the public measurement and control device is with the on-state of change over switch QK to be sent 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 acquired by the public measurement and control device, the bus connection or segmentation 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, 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.

Compared with the prior art, the utility model discloses technical scheme's beneficial effect is:

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 electrified and started after the bus or a subsection interval primary operation is carried out to be closed; 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 firstly confirming once correct parallel and then carrying out secondary parallel is met. By adding the information of ' automatic judgment of bus PT secondary parallel in ' microcomputer five-prevention system ' and locking the tripping operation of the segmented circuit breaker, the accident that secondary forced secondary and secondary equipment burnt out due to the fact that the bus PT is firstly disconnected by mistake and the primary system is disconnected by mistake 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 changed, and the upgrading and modifying work can be finished by the microcomputer five-prevention coded 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 of the present invention;

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

fig. 3 is a schematic diagram of the acquisition and transmission of the information related to the five prevention devices of the present 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 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 will be further explained with reference to the accompanying drawings and examples.

Example 1:

the embodiment provides a bus voltage parallel circuit based on intelligent operation and maintenance, which comprises a microcomputer five-prevention lock BS, a microcomputer five-prevention host, a first isolating switch normally-open auxiliary contact 1G, a second isolating switch normally-open auxiliary contact 2G, a transfer switch QK, a segmented or bus-coupled breaker normally-open auxiliary contact FDL1, a bus PT parallel relay BLJ, a first isolating switch normally-closed auxiliary contact 3G, a second isolating switch normally-closed auxiliary contact 4G, a segmented or bus-coupled breaker normally-closed auxiliary contact FDL2, an abnormality verifier YCJ and an abnormality verifier YCJ contact, wherein the bus PT parallel relay BLJ is a two-position relay and comprises a starting coil and a return coil; when only return coil circular telegram back, bus PT parallel relay BLJ returns and keeps returning the state, and first bus is successively through first isolator normally open auxiliary contact 1G, segmentation or bus tie circuit breaker normally open auxiliary contact FDL1 and second isolator normally open auxiliary contact 2G and second bus are parallel to each other, wherein:

the first end of the five-prevention microcomputer locking BS is connected with a positive power supply, the second end of the five-prevention microcomputer locking BS is electrically connected with one end of a normally-open auxiliary contact 1G of a first isolating switch, the other end of the normally-open auxiliary contact 1G of the first isolating switch is electrically connected with one end of a normally-open auxiliary contact FDL1 of a sectional or bus-coupled circuit breaker, the other end of the normally-open auxiliary contact FDL1 of the sectional or bus-coupled circuit breaker is electrically connected with one end of a normally-open auxiliary contact 2G of a second isolating switch, the other end of the normally-open auxiliary contact 2G of the second isolating switch 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 second end of the microcomputer five-prevention lock BS is respectively connected with one end of a first isolating switch normally-closed auxiliary contact 3G, one end of a second isolating switch normally-closed auxiliary contact 4G and one end of a sectional or bus-coupled breaker normally-closed auxiliary contact FDL2, the other end of the first isolating switch normally-closed auxiliary contact 3G, the other end of the second isolating switch normally-closed auxiliary contact 4G and the other end of a sectional or bus-coupled breaker normally-closed auxiliary contact FDL2 are electrically connected with a 15 contact of a selector switch QK, a 16 contact of the selector switch QK is electrically connected with an abnormality verifier YCJ and then connected with a negative power supply, and the contact of the abnormality verifier YCJ is connected between a 2 contact of the selector switch QK and a starting coil of a bus-coupled relay BLJ.

The normally open auxiliary contact 1G and the normally closed auxiliary contact 3G of the first isolating switch are auxiliary contacts of the same primary device; the normally-open auxiliary contact 2G and the normally-closed auxiliary contact 4G of the second isolating switch are auxiliary contacts of the same primary device; the breaker normally open auxiliary contact FDL1 and the breaker normally closed auxiliary contact FDL2 are auxiliary contacts of the same primary equipment. When the first isolating switch, the circuit breaker and the second isolating switch are closed, the secondary voltages of the first bus PT and the second bus PT are allowed to be parallel.

If the normally open auxiliary contact 1G of the first isolating switch is in the closed position, the normally open contact is in the closed position, and the normally closed contact is in the open position, so that the normally open contact is in the closed position and the normally closed contact is no longer in the open position, the auxiliary contact is abnormal, and the normally open contact is mistakenly connected or the normally closed contact is mistakenly connected, so that the PT is allowed to be parallel only by the normally open contact, and the wrong parallel accident is possible, and measures must be taken to prevent the accident; that is, when the normally open contacts of the normally open auxiliary contact 1G of the first isolating switch, the auxiliary contact of the circuit breaker FDL and the normally open contact 2G of the second isolating switch are all switched on, and the normally closed contacts of the normally closed auxiliary contact 3G of the first isolating switch, the normally closed auxiliary contact FDL2 of the segmented or bus-coupled circuit breaker and the normally closed auxiliary contact 4G of the second isolating switch are all switched off, the secondary parallel operation of the bus PT is allowed.

If the QK change-over switch is switched to the state of allowing parallel connection, when at least one normally open contact of the first isolating switch normally open auxiliary contact 1G, the breaker FDL auxiliary contact and the second isolating switch normally open auxiliary contact 2G is in the on position, the abnormal verifier YCJ contact acts, on one hand, the normally closed contact of the abnormal verifier YCJ contact breaks the PT parallel relay BLJ to enable the parallel relay to be incapable of realizing parallel connection, and on the other hand, the normally open contact is connected after the abnormal verifier YCJ contact acts, and the QK change-over switch allows the parallel contact to send out a 'contact abnormal PT secondary incapable of parallel connection alarm signal'.

In addition, a bus voltage parallel circuit based on intelligent operation and maintenance, as shown in fig. 1 to 4, 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 transfer switch QK, a segmented or bus-coupled breaker on-position auxiliary contact, a first isolating switch normally-open auxiliary contact 1G, a second isolating switch normally-open auxiliary contact 2G 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 disconnected by mistake for the second time.

The working principle of the loop is explained as follows:

when a segmented or bus-coupled circuit breaker, a first isolating switch normally-open auxiliary contact 1G and a second isolating switch normally-open auxiliary contact 2G are in a closed position, it is indicated that a section I bus and a section II bus in an electrical primary system are in parallel, at the moment, the segmented or bus-coupled circuit breaker closed position auxiliary contact, the first isolating switch normally-open auxiliary contact 1G and the second isolating switch normally-open auxiliary contact 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 normally-open auxiliary contact FDL1, the first isolating switch normally-open auxiliary contact 1G and the second isolating switch normally-open auxiliary contact 2G are switched on, 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 machine sends the information of allowing the bus PT to be in secondary 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 passes through a bus PT parallel relay BLJ starting coil, a 1-2 contact of a selector switch QK, a second isolating switch normally-open auxiliary contact 2G, a segmented or bus-coupled breaker normally-open auxiliary contact FDL1, a first isolating switch normally-open auxiliary contact 1G 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 the positive power supply, and the bus PT parallel relay BLJ acts. And the bus PT is successfully paralleled for the second time.

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 is provided with 1 normally open auxiliary contact BLJ-9 (signals are blocked when bus PT secondary is in parallel and sectional opening operation), the auxiliary contact BLJ-9 is connected and connected into a public measurement and control device, the public measurement and control device obtains information of 'bus PT secondary parallel in' and sends the information to a microcomputer five-prevention host, after the microcomputer five-prevention host obtains the information, the microcomputer five-prevention host judges that the bus PT secondary is prohibited from 'sectional switch tripping' in parallel, at the moment, a 'trip signal of a sectional 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 sectional breaker trip operation loop cannot be in short circuit through the microcomputer five-prevention handheld key, the sectional breaker operation loop cannot obtain a positive power supply, and the sectional 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 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 realizing the tripping 1 and the tripping 2 of the blocking section breaker respectively 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; and the circuit breaker control loop power supply air switch is tripped off at the subsection interval, so that the circuit breaker control loop is powered off, and the purpose of locking the subsection circuit breaker and opening the brake is realized. The design has the advantages of meeting the requirement of intelligent operation and maintenance intelligent control and locking all the trip commands at one time, including locking of local manual brake opening 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 transfer switch QK, a segmented (or bus-coupled) breaker on auxiliary contact, a first isolating switch normally-open auxiliary contact 1G, a second isolating switch normally-open auxiliary contact 2G 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, a first isolating switch normally-open auxiliary contact 1G and a second isolating switch normally-open auxiliary contact 2G are all in closed positions, it is indicated that a section I bus and a section II bus in an electrical primary system are still in parallel, at the moment, the segmented or bus-coupled circuit breaker closed auxiliary contact, the first isolating switch normally-open auxiliary contact 1G and the second isolating switch normally-open auxiliary contact 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 normally-open auxiliary contact FDL1, the first isolating switch normally-open auxiliary contact 1G and the second isolating switch normally-open auxiliary contact 2G are switched on, 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 primary bus is manually confirmed to run in a normal state in parallel, the change-over switch is switched to the position of 'allowing disconnection', so that the bus PT can be allowed to be disconnected for the second time; when the microcomputer five-prevention host sends the information of allowing the 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, a normally open auxiliary contact 2G of a second isolating switch, a normally open auxiliary contact FDL1 of a segmented or bus-coupled breaker, a normally open auxiliary contact 1G of a first isolating switch 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.

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 '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 coding lock DL-BS in a tripping operation circuit of the sectional breaker can be in short circuit through the microcomputer five-prevention handheld key, the operation circuit of the sectional breaker can obtain a positive power supply, and the tripping operation of the sectional 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, 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.

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.

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 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, 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 free of 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 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 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, 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 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, 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 five-prevention allows the operation of 'bus PT secondary disconnection' only when the three-phase voltage monitoring relays DYJ1 and DYJ2 of the two-section bus judge that the three-phase voltage is present or that the three-phase voltage is absent.

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 the person to confirm that the primary device is normally closed, and then outputs the result as bus PT secondary remote operation permission (namely, remote paralleling or disconnection), and after the contact is disconnected, the public measurement and control device judges that the intelligent operation and maintenance system device replaces the person to confirm that the primary device is abnormally closed, and then outputs the result as bus PT secondary remote operation prohibition (namely, remote paralleling 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 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 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, 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, the PT secondary air switches of the I bus are normally open auxiliary contacts of a normally open 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 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;

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

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 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, 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 secondary air switches output by the II bus PT measurement and control device are judged to be 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 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 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 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: and 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 microcomputer five-prevention host machine judges that the switching-off operation condition of the sectional breaker is forbidden to be met, and the microcomputer five-prevention host machine starts to judge again.

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 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; 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 microcomputer five-prevention host machine obtains the information of the position signal of the sectional breaker at the opening position 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 sectional breaker at the closing position is obtained, carrying out the next judgment;

the next step is: when the microcomputer five-prevention host machine obtains information of 'the disconnecting position signal of the disconnecting switch 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 information of 'the disconnecting position signal of the disconnecting switch at the sectional interval 1G' is obtained, carrying out the next judgment;

the next step is: when the microcomputer five-prevention host machine obtains the information of the 'on-brake position signal of the sectionalized interval 2G isolating switch' through the Ethernet by the sectionalized measurement and control device, the parallel condition is judged to be not met, the judgment is restarted, and if the 'on-brake position signal of the sectionalized interval 2G isolating switch' is obtained, the bus PT secondary parallel operation is judged to be allowed.

The bus PT secondary allows the microcomputer five-prevention locking logic of splitting:

when the microcomputer five-prevention host machine obtains 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 splitting condition is not met, restarting the judgment, and if the information that the bus PT secondary selector switch QK is at the allowable splitting position is obtained, performing the next judgment;

the next step is: when the microcomputer five-prevention host machine obtains 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 splitting condition is not met, restarting the judgment, and if the 'position signal of the sectionalized circuit breaker at the closing' is obtained, performing the next judgment;

the next step is: when the microcomputer five-prevention host machine obtains information of 'the position signal of the isolating switch at the opening position of the sectionalized interval 1G' through the Ethernet by the sectionalizing 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 isolating switch at the opening position of the sectionalized interval 1G' is obtained, carrying out the next judgment;

the next step is: when the microcomputer five-prevention host machine obtains information of 'the position signal of the sectional interval 2G isolating switch at the opening' through the Ethernet by the sectional measurement and control device, judging that the splitting condition is not met, restarting the judgment, and if the information of 'the position signal of the sectional interval 2G isolating switch at the closing' is obtained, performing the next judgment;

the next step is: when the microcomputer five-prevention host machine obtains judgment information meeting the requirement that the three phases of the I bus PT are all pressed by the I bus PT interval measurement and control device through the Ethernet, the next judgment is carried out;

the next step is: when the microcomputer five-prevention host machine obtains judgment information that the condition 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 is met, judging that the output allows the secondary splitting operation of the bus PT;

when the microcomputer five-prevention host machine obtains judgment information that the three phases of the bus I and the bus PT are all provided with pressure but not met by the bus I and the bus PT interval measurement and control device 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 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 microcomputer five-prevention host machine obtains judgment information meeting the requirement that the three phases of the bus I and the bus PT are all non-voltage through the Ethernet by the bus I and the bus PT interval measurement and control device, the next judgment is carried out, namely the judgment that the three phases of the bus II and the bus PT are all non-voltage;

when the microcomputer five-prevention host machine obtains judgment information that the condition that the three phases of PT of the II bus are all pressed by the II bus PT interval measurement and control device through the Ethernet is not met, 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 microcomputer five-prevention host machine obtains judgment information meeting the requirement that the three phases of the II bus PT are all non-voltage through the II bus PT interval measurement and control device by the Ethernet, the judgment output allows the bus PT secondary splitting operation;

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 closing auxiliary contact, a first disconnecting switch normally-open auxiliary contact 1G, a second disconnecting switch normally-open auxiliary contact 2G, 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:

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

if the selector switch QK is switched to the position of allowing remote operation, namely allowing the remote parallel contacts to be switched on, and when the selector 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 selector 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 computer through the network; if the intelligent judgment result of the intelligent operation and maintenance system indicates that the primary equipment is normally switched on at the interval of the sections, the output ' intelligent operation and maintenance system intelligently judges that the primary equipment is normally switched on ' normally open contact is switched on ' and is connected to a common measurement and control device, and the common measurement and control device judges that the intelligent operation and maintenance system equipment replaces the mode that the primary equipment is normally switched on artificially and sends the information to an ' intelligent five-prevention host ' through a network; meanwhile, the normally-open auxiliary contact FDL1 of the segmented or bus-coupled circuit breaker, the normally-open auxiliary contact 1G of the first isolating switch and the normally-open auxiliary contact 2G of the second isolating switch are all segmented or bus-coupled after being switched on) measurement and control devices transmit the information to the intelligent five-prevention host computer through a network; the intelligent five-prevention host machine judges that the information is received as follows: 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 this time, if the superior intelligent operation and maintenance system sends a 'bus PT secondary intelligent parallel' task order 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 applies for judgment to the intelligent five-prevention host computer in the transformer substation and allows the 'bus PT secondary intelligent parallel', the intelligent five-prevention host computer sends 'bus PT secondary intelligent parallel' information allowed to be sent 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 to start the ZNBL relay to output 'I-II female PT remote intelligent parallel' contact, when the public measurement and control device starts the ZNBL relay to enable the 'I-II female PT remote intelligent parallel' contact to be connected, the negative power supply passes through a bus PT relay parallel BLJ starting coil, a ZNBL relay contact, a 13-14 contact of a switching switch QK, a 2G on auxiliary contact, FDL closing auxiliary contact, 1G closing auxiliary contact and 9-10 contacts of the change-over switch QK are connected to the positive power supply, and a 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 bus PT secondary is blocked in parallel and sectional opening operation), the auxiliary contact BLJ-9 is connected and connected into the public measurement and control device, the public measurement and control device obtains information of 'bus PT secondary parallel in middle' and sends the information to the intelligent five-prevention host, after the intelligent five-prevention host obtains the information, the intelligent five-prevention host judges that the bus PT secondary is forbidden to 'carry out sectional switch tripping' in parallel, at the moment, after the superior intelligent operation and maintenance system sends a 'carry out sectional 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 applies for judgment and allows 'carry out sectional switch tripping' permission, the intelligent five-prevention host judges and sends a 'trip forbid sectional switch signal' to the intelligent five-prevention host, namely, the tripping operation function of the intelligent operation and maintenance system of the sectionalized circuit breaker is forbidden.

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, 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 can not be blocked by the blocking box of the section and the local manual brake-off.)

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; and the circuit breaker control loop power supply air switch is tripped off at the subsection interval, so that the circuit breaker control loop is powered off, and the purpose of locking the subsection circuit breaker and opening the brake is realized. The design has the advantages of meeting the requirement of intelligent operation and maintenance intelligent control and locking all the trip commands at one time, including locking of local manual brake opening commands.

The fifth part is that: 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 transfer switch QK, a sectionalized (or bus-coupled) breaker closing auxiliary contact, a first disconnecting switch normally-open auxiliary contact 1G, a second disconnecting switch normally-open auxiliary contact 2G, 13-14 contacts (allowing a remote operation contact 2) of the transfer switch QK, an I-II bus PT remote intelligent disconnection contact (ZNJL 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, a first isolating switch normally-open auxiliary contact 1G and a second isolating switch normally-open auxiliary contact 2G are all in closed positions, it is indicated that a section I bus and a section II bus in an electrical primary system are parallel, at the moment, the segmented or bus-coupled circuit breaker closed auxiliary contact, the first isolating switch normally-open auxiliary contact 1G and the second isolating switch normally-open auxiliary contact 2G are all in a connected state, and a loop can perform secondary parallel-disconnection operation on a bus PT;

if the selector switch QK is switched to the position of allowing remote operation, namely allowing the remote parallel contacts to be switched on, and when the selector 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 selector 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 computer through the network; if the intelligent judgment result of the intelligent operation and maintenance system indicates 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 to the intelligent five-prevention host computer through the network; meanwhile, after the sectional or bus tie breaker normally-open auxiliary contact FDL1, the first isolating switch normally-open auxiliary contact 1G and the second isolating switch normally-open auxiliary contact 2G are switched on, the sectional or bus tie measurement and control device transmits the information to the intelligent five-prevention host computer through a network; the intelligent five-prevention host machine judges that the information is received as follows: when the primary system buses are already in the parallel position, the intelligent operation and maintenance substitute for artificially confirming that the primary buses are in parallel and normal and switching the selector switch to the position allowing remote operation, so that the secondary intelligent disconnection of the buses PT can be allowed; at this time, if the superior intelligent operation and maintenance system sends a task command of 'performing secondary intelligent disconnection of bus PT' to the intelligent operation and maintenance host computer of the transformer substation through a communication network, the intelligent operation and maintenance host computer of the transformer substation applies for judgment to the intelligent five-prevention host computer in the transformer substation and allows 'secondary intelligent disconnection of bus PT', therefore, the intelligent five-prevention host computer sends 'secondary intelligent disconnection of bus PT' information allowed 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 to start the ZNJL relay to output a 'I-II bus PT remote intelligent disconnection' contact, when the public measurement and control device starts the ZNJL relay to enable the 'I-II bus PT remote intelligent disconnection' contact to be connected, the negative power supply returns to the disconnection coil, the ZNJL relay contact, the 13-14 contact of the switching switch QK, the 2G on-position auxiliary contact through the bus PT parallel relay BLJ, FDL closes position auxiliary contact, 1G closes position auxiliary contact, 9-10 contact to the positive power connection of change over switch QK, and bus PT parallels relay BLJ action. And secondary remote intelligent splitting of the intelligent operation and maintenance system bus PT is realized.

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 'the bus PT secondary is disconnected', the information is uploaded to an intelligent five-prevention host, the intelligent five-prevention host judges that the bus PT secondary is disconnected and does not prohibit 'the section switch from jumping', at the moment, the intelligent five-prevention host judges that the bus PT secondary is not in parallel and judges that 'the section switch from jumping' is not prohibited ', at the moment, if an upper-level intelligent operation and maintenance system sends' the section switch from jumping 'task order 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 applies for judgment and allows' the section switch from jumping 'to be permitted, the intelligent five-prevention host judges and sends' an 'the section switch from jumping' signal to the intelligent five-prevention host, the tripping operation of the intelligent operation and maintenance system of the segmented circuit 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-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, 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.

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.

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 the devices collect information and send the information 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 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 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)';

after the contact is connected, the public measurement and control device judges that the intelligent operation and maintenance system device replaces the person to confirm that the primary device is normally closed, and then outputs the result as bus PT secondary remote operation permission (namely, remote paralleling or disconnection), and after the contact is disconnected, the public measurement and control device judges that the intelligent operation and maintenance system device replaces the person to confirm that the primary device is abnormally closed, and then outputs the result as bus PT secondary remote operation prohibition (namely, remote paralleling 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 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 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, 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, the PT secondary air switches of the I bus are normally open auxiliary contacts of a normally open 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 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;

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

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 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, 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 secondary air switches output by the II bus PT measurement and control device are judged to be invalid in the position-dividing signals.

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

when the information that the bus PT secondary change-over switch QK is at the remote operation position allowed is obtained by the public measurement and control device through the Ethernet, the intelligent five-prevention host machine carries out next judgment; when the information that the bus PT secondary transfer switch QK is at the remote operation allowing position obtained by the intelligent five-prevention host computer through the Ethernet by the public measurement and control device is not established, 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 information of the bus PT secondary in-parallel signal acquired by the intelligent five-prevention host computer 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 intelligent five-prevention host computer through the Ethernet by the public measurement and control device is not true, judging that the condition for forbidding the intelligent operation and maintenance system to carry out the switching-off operation of the segmented circuit breaker is not met, and restarting the judgment;

the next step is: when the microcomputer five-prevention host machine obtains the information that the three phases of the bus I and the bus PT are all provided with voltage through the bus I and the bus PT interval measurement and control device through the Ethernet, the step of switching-off operation of the segmented circuit breaker is judged to be forbidden, and if the information that the three phases of the bus I and the bus PT are all provided with voltage is obtained, the next step of judgment is carried out;

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

The intelligent five-prevention closing logic of the control loop of the bus coupler or the sectional circuit breaker is as follows:

when the system change-over switch QK is switched to the bus PT secondary change-over switch QK at the position allowing remote operation, when the bus tie or the sectionalized interval isolating switch and the circuit breaker are both closed, the bus PT secondary paralleling cannot be automatically carried out by mistake, therefore, the 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, and the design has one of the advantages.

Bus PT secondary permission parallel intelligent five-prevention lockout 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 computer 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 the remote operation is obtained, performing the next judgment;

the next step is: when the intelligent five-prevention host machine obtains the information of the position signal of the sectional breaker at the opening of the switch 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 sectional breaker at the closing of the switch is obtained, carrying out the next judgment;

the next step is: when the intelligent five-prevention host computer obtains the information of the position signals of the sectionalized disconnecting switches at the sectionalizing intervals 1G through the Ethernet by the sectionalized measurement and control device, judging that the parallel conditions are not met, restarting the judgment, and if the information of the position signals of the sectionalized disconnecting switches at the sectionalizing intervals 1G is obtained, carrying out the next judgment;

the next step is: when the intelligent five-prevention host computer obtains the information of the position signals of the sectionalized gap 2G disconnecting switches at the opening position through the Ethernet by the sectionalized measurement and control device, judging that the parallel conditions are not met, restarting the judgment, and if the information of the position signals of the sectionalized gap 2G disconnecting switches at the closing position is obtained, carrying out 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 is normally switched on is obtained by the public measurement and control device through the Ethernet, the intelligent five-prevention host judges that the parallel condition is not met, and starts judging again, and if the information that the intelligent operation and maintenance system intelligently judges that the primary equipment at the interval is normally switched on is obtained, the intelligent operation and maintenance system judges that the secondary parallel operation of the bus PT is allowed.

And fourthly, intelligent five-prevention lockout logic for bus PT secondary permission of separation:

when the intelligent five-prevention host computer obtains the information that the bus PT secondary selector switch QK is at the position allowing remote operation through the Ethernet by the public measurement and control device, the splitting condition is judged not to be met, the judgment is restarted, and if the information that the bus PT secondary selector switch QK is at the position allowing remote operation is obtained, the next judgment is carried out;

the next step is: when the intelligent five-prevention host machine obtains the information of the position signal of the sectionalized circuit breaker at the opening through the Ethernet by the sectionalized measurement and control device, judging that the splitting condition is not satisfied, 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 computer obtains the information of the position signals of the sectionalized disconnecting switches at the sectionalizing intervals 1G through the Ethernet by the sectionalized measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the information of the position signals of the sectionalized disconnecting switches at the sectionalizing intervals 1G is obtained, carrying out the next judgment;

the next step is: when the intelligent five-prevention host computer obtains the information of the position signals of the sectionalized gap 2G disconnecting switches on the switching-on position through the Ethernet by the sectionalized measurement and control device, judging that the disconnection condition is not met, restarting the judgment, and if the information of the position signals of the sectionalized gap 2G disconnecting switches on the switching-on position is obtained, 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 public measurement and control device through the Ethernet, the situation that the parallel condition is not met is judged, 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 machine obtains judgment information meeting the requirement that the three phases of the I bus PT have all pressure through the I bus PT interval measurement and control device by the Ethernet, the next judgment is carried out;

the next step is: when the intelligent five-prevention host machine obtains judgment information that the condition 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 is met, judging that the output allows the secondary splitting operation of the bus PT;

when the intelligent five-prevention host machine obtains judgment information that the three phases of the PT of the I bus are all pressurized from the PT interval measurement and control device of the I bus through the Ethernet, the judgment is carried out in the next step; on the other hand, if the intelligent five-prevention host obtains judgment information that the three-phase voltage of the I bus PT 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 obtains judgment information meeting the requirement that the three phases of the PT of the I bus are all non-pressure through the I 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 PT of the II bus are all non-pressure is carried out;

when the intelligent five-prevention host machine obtains 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 information is judged in the next step; on the other hand, if the intelligent five-prevention host computer obtains judgment information that the condition that the PT three phases of the II bus are not all pressure from the PT interval measurement and control device of the II bus through the Ethernet, the disconnection condition is judged not to be met, and the program returns to restart the judgment; on the other hand, if the intelligent five-prevention host obtains judgment information meeting the requirement that the PT three phases of the II bus are all non-pressure through the II bus PT interval measurement and control device by the Ethernet, the judgment output allows the secondary splitting operation of the bus PT;

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 is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light 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 (9)

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 first isolating switch normally-open auxiliary contact 1G, a second isolating switch normally-open auxiliary contact 2G, a transfer switch QK, a segmented or bus-coupled breaker normally-open auxiliary contact FDL1, a bus PT parallel relay BLJ, a first isolating switch normally-closed auxiliary contact 3G, a second isolating switch normally-closed auxiliary contact 4G, a segmented or bus-coupled breaker normally-closed auxiliary contact FDL2, an abnormality verifier YCJ and an abnormality verifier YCJ contact, wherein the bus PT parallel relay BLJ is a double-position relay and comprises a starting coil and a return coil; when only return coil circular telegram back, bus PT parallel relay BLJ returns and keeps returning the state, and first bus is successively through first isolator normally open auxiliary contact 1G, segmentation or bus tie circuit breaker normally open auxiliary contact FDL1 and second isolator normally open auxiliary contact 2G and second bus are parallel to each other, wherein:

the first end of the five-prevention microcomputer locking BS is connected with a positive power supply, the second end of the five-prevention microcomputer locking BS is electrically connected with one end of a normally-open auxiliary contact 1G of a first isolating switch, the other end of the normally-open auxiliary contact 1G of the first isolating switch is electrically connected with one end of a normally-open auxiliary contact FDL1 of a sectional or bus-coupled circuit breaker, the other end of the normally-open auxiliary contact FDL1 of the sectional or bus-coupled circuit breaker is electrically connected with one end of a normally-open auxiliary contact 2G of a second isolating switch, the other end of the normally-open auxiliary contact 2G of the second isolating switch 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 second end of the microcomputer five-prevention lock BS is respectively connected with one end of a first isolating switch normally-closed auxiliary contact 3G, one end of a second isolating switch normally-closed auxiliary contact 4G and one end of a sectional or bus-coupled breaker normally-closed auxiliary contact FDL2, the other end of the first isolating switch normally-closed auxiliary contact 3G, the other end of the second isolating switch normally-closed auxiliary contact 4G and the other end of a sectional or bus-coupled breaker normally-closed auxiliary contact FDL2 are electrically connected with a 15 contact of a selector switch QK, a 16 contact of the selector switch QK is electrically connected with an abnormality verifier YCJ and then connected with a negative power supply, and the contact of the abnormality verifier YCJ is connected between a 2 contact of the selector switch QK and a starting coil of a bus-coupled parallel relay BLJ;

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.

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 a normally-open auxiliary contact 2G of a second isolating switch;

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 the public measurement and control device of 8 contact switch-on of change over switch QK, the on-state of 7 contacts and the 8 contacts of change over switch QK is the same with the on-state of 3 contacts and 4 contacts of change over switch QK, public 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.

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 obtains the states of a first isolating switch normally open auxiliary contact 1G, a second isolating switch normally open auxiliary contact 2G, and a section or bus coupler circuit breaker normally open auxiliary contact FDL1, the first bus PT interval measurement and control device obtains first bus PT three-phase voltage information, first bus PT isolating switch 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 obtains second bus PT three-phase voltage information, second bus PT isolating switch PT-2G auxiliary contact information, and second bus PT three-phase voltage monitoring relay DYJ2 contact information, and the first bus PT interval measurement and control device, the second bus PT interval 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.

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

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 segmentation or female allies oneself with circuit breaker normally open auxiliary contact FDL1, first isolator normally open auxiliary contact 1G, second isolator normally open auxiliary contact 2G all when closing the position, then explain that I section generating line and II section generating line have realized paralleling in the electric primary system, segmentation or female allies oneself with circuit breaker closed position auxiliary contact this moment, first isolator normally open auxiliary contact 1G, second isolator normally open auxiliary contact 2G all is at the on-state, the return circuit can carry out the generating line PT secondary and parallels.

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