CN103887780A

CN103887780A - Hybrid networking network type protection method based on open-loop mode operation

Info

Publication number: CN103887780A
Application number: CN201410055383.2A
Authority: CN
Inventors: 黄小耘; 袁钦成; 李春光; 袁启洪; 王娟娟; 董良; 董旭柱; 于力; 彭飞进; 黄红远
Original assignee: Beijing Creative Distribution Automation Co ltd; Foshan Power Supply Bureau of Guangdong Power Grid Corp
Current assignee: Beijing Creative Distribution Automation Co ltd; Foshan Power Supply Bureau of Guangdong Power Grid Corp
Priority date: 2014-02-18
Filing date: 2014-02-18
Publication date: 2014-06-25
Anticipated expiration: 2034-02-18
Also published as: CN103887780B

Abstract

The invention discloses a hybrid networking network type protection method based on open-loop mode operation, which is used for a hybrid networking system of circuit breakers and load switches, and the system is operated in an open-loop mode. The networking system comprises a plurality of transformer substations and terminal units which are connected to the transformer substations, and is characterized in that each terminal unit comprises an intelligent controller and a communication module; each intelligent controller controls the circuit breaker or the load switch; the communication module in each terminal unit only communicates with the adjacent terminal unit; the intelligent controller in each terminal unit collects the voltage and the current of the circuit breaker or the load switch in the terminal unit and the current and fault information of the load switch or the circuit breaker in the adjacent terminal unit. The invention adopts the peer-to-peer communication network, enables the terminal units on the circuit to communicate with each other, collects fault information of adjacent switches, makes arbitration and realizes fast fault positioning and fault isolation.

Description

The network type guard method of the mixed networking based on open loop mode operation

Technical field

The present invention relates to a kind of guard method for intelligent electric power network, relate in particular to a kind of network type guard method of the mixed networking based on the operation of electrical network open loop mode.

Background technology

Power distribution automation is the important component part of intelligent grid, for improving power supply reliability, expand power supply capacity and realize the high-efficiency and economic operation of electrical network significant.Electric network fault processing is the core content of power distribution automation, and different according to the kind of the block switch of selecting and interconnection switch, the automation scheme of taking is also different.In traditional distribution system protection, in the time adopting on-load switch or breaker, any point fault on circuit, all needs transformer station's outlet breaker tripping operation, to remove fault.In the time of line end fault, also can make the unnecessary impact of the load in paired transmission line leading portion and stage casing.In the time adopting circuit breaker or automatic circuit, if protection can be worked in coordination, fault can be excised on the spot, and this is more satisfactory scheme.In service in open loop, because circuit distance is shorter, short circuit current is all large especially, and cascaded switch is many, and in order to realize selectivity, outlet protection may need to set very long time delay, and this is definitely unallowed in actual motion.In this case, the rapidity of protection and selectivity are a pair of implacable contradiction.Meanwhile, when turning for after occurring, differential the becoming oppositely on whole piece main ring, cannot accurately locate isolated fault when line failure.

The essence of traditional distribution system current protection is an independently cell protection, its only detect flow through the electric current of institute's monitoring switch and determine protection action whether and action delay, and be indifferent to the protection action situation of adjacent switch.If the scope of monitoring for protection is expanded to one group of switch that the switch that is connected is even connected by a point, the cooperation of the superior and the subordinate's protection can be understood as the internal coordination of protection.Pilot wire protection, the carrier current protection etc. of the bus differential protecting of transformer station inside, transformer differential protection, high-pressure system are in order to realize the coordination of protection; the electric current of exactly line of different location such as circuit both sides, transformer high-low-voltage both sides or three sides, bus etc. being located is delivered to an inspection center and is compared and differentiate, thereby realizes in district or the differentiation of external area error.If but by its application of principle to distribution line, will cause the complexity of power distribution protection and with high costs and lose Practical significance.

In the time breaking down on circuit, on-the-spot FTU delivers to control centre by fault message by communication port, control centre is according on off state, fault detect information, network topology analysis, failure judgement section, issue guidance command, carry out a series of automatic operations, reconstructed network, with the power supply of isolated fault and the non-fault section of recovery, this is so-called centralized intelligence.This scheme precise control, is applicable to various complication systems.But it need to have the computer soft and hardware system of reliable communication channel and control centre, and it is long to complete once " locating, isolate, turn confession " required time.

As China Patent No. CN200510024379.0 patent of invention, open day is on September 20th, 2006, a kind of electric power transmission network control method without main website is disclosed, described electric power transmission network control method comprises: failure detection steps: corresponding feeder terminal unit detection failure power supply, and send fault message to all feeder terminal units; Fault location step: feeder terminal unit, according to fault message, positions fault point; Fault Isolation step: fault point feeder terminal unit separating brake, and instruction downstream feeder terminal unit separating brake; Separating brake reporting step: fault point feeder terminal unit and downstream feeder terminal unit send state information; Service restoration step: open loop point closes a floodgate.Owing to not adopting master station computer in control method of the present invention, even if therefore indivedual feeder terminal units break down with communicating by letter of main website, control algolithm of the present invention also can minimize on use isolated fault, and can not cause whole network to recover.In such scheme, each current feed terminal need to send information to all current feed terminals, each current feed terminal all needs to set up the information table of all current feed terminals, thereby judging voluntarily to realize according to the state of all current feed terminals controls, this technical scheme is only suitable for open loop models, all current feed terminals communicate by letter to each other normal situation and full circuit breaker network model.Each current feed terminal need to send information to all current feed terminals, and each current feed terminal all needs to set up the information table of all current feed terminals, and the processing time is long, and the response time is slow.

Summary of the invention

Technical problem to be solved by this invention is to overcome the deficiency of above-mentioned prior art, and what provide a kind ofly responds that action is fast, terminal burden is light, the network type guard method of the mixed networking based on open loop mode operation of system stability.

According to the network type guard method of a kind of mixed networking based on open loop mode operation provided by the invention, for circuit breaker and the on-load switch mixed networking system of open loop mode operation, described group network system comprises the terminal unit that multiple transformer stations are connected with described transformer station, it is characterized in that: each described terminal unit comprises intelligent controller and communication module, each described intelligent controller control circuit breaker or on-load switch, each described terminal unit is only communicated by letter with the described terminal unit of next-door neighbour, intelligent controller in each described terminal unit is collected circuit breaker in this terminal unit or the voltage of on-load switch, electric current and fault message that on-load switch in the electric current of flowing through and adjacent terminal unit or circuit breaker are flowed through, for the terminal unit of controlling described circuit breaker, when intelligent controller in each described terminal unit detects fault current, communicate by letter with adjacent described terminal unit, do not have fault current to flow out during when there being fault current to flow into, illustrate that fault occurs in the switching range of this terminal unit control, intelligent controller in this terminal unit starts fast tripping protection function or overcurrent protection function and controls the circuit breaker trip in this terminal unit, in the time having fault current to flow into and fault current flows out, illustrate that fault does not occur in the switching range of this terminal unit control, the circuit breaker in this terminal unit of intelligent controller control in this terminal unit is in backup status, for the terminal unit of controlling described on-load switch, on-load switch self overcurrent, in the time that very short time, internal fault electric current disappeared again, communicate by letter with adjacent described terminal unit, do not have fault current to flow out when there being fault current to flow into, after described on-load switch self decompression defluidization, start separating brake, otherwise be failure to actuate.Very short time in this process is generally the time of higher level's circuit breaker excision fault.

Network type guard method according to a kind of mixed networking based on open loop mode operation provided by the invention also has following attached technical characterictic:

Preferred embodiment is: each described terminal unit has whole or several in following function: fast tripping protection function, overcurrent protection function, reclosing function, obtain electric coincidence function, successful reclosing latch-up protection function in short-term, be incorporated into quick tripping function after fault, fault current pulse detection function, on-load switch Fault Isolation function, obtain electric time-delay closing function, locking separating brake function in short-term after closing a floodgate successfully, be incorporated into separating brake blocking function after fault, interlocking dead electricity time delay separating brake blocking function, not blocking function of dead electricity time delay separating brake, residual voltage pulse separating brake blocking function, one-sided decompression time-delay closing function, the one-sided decompression time-delay closing of inspection locking function.

Preferred embodiment is: in the time that communication is normal; be close between the circuit breaker of described terminal unit of closed transformer station or on-load switch and closed transformer station and break down; and be close to closed transformer station described terminal unit control be described circuit breaker or on-load switch, protection action is as follows:

Wire-outgoing breaker in A, closed transformer station detects after fault current, starts fast tripping protection function or overcurrent protection function;

Wire-outgoing breaker in B, closed transformer station starts reclosing function subsequently;

Wire-outgoing breaker in C, closed transformer station detects after fault current again, fast trip;

D, the intelligent controller being close in the described terminal unit of closed transformer station start not blocking function and residual voltage pulse separating brake blocking function of dead electricity time delay separating brake, circuit breaker or on-load switch separating brake;

E, the intelligent controller that one of them is close in the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, on-load switch or breaker closing.

Preferred embodiment is: in communication, when normal, fault point is positioned at the described terminal unit of controlling described circuit breaker, and described in the next stage of this terminal unit terminal unit control be on-load switch or circuit breaker, protection action is as follows:

A, the intelligent controller that is positioned at the described terminal unit at fault point place detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker trip;

B, be positioned at fault point place described terminal unit intelligent controller start reclosing function and be incorporated into fault after quick tripping function, circuit breaker first closes a floodgate and trips afterwards;

C, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function, on-load switch or breaker open operation;

D, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, on-load switch or breaker closing.

Preferred embodiment is: in the time that communication is normal, fault point is positioned at the described terminal unit below of controlling described on-load switch, and protection action is as follows:

A, the described terminal unit that is arranged in fault point higher level's control circuit breaker detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker trip;

B, the intelligent controller that is positioned at the described terminal unit at fault point place start fault current pulse detection function and on-load switch Fault Isolation function, and on-load switch is separating brake under electroless state;

C, the described terminal unit that is arranged in fault point higher level's control circuit breaker start reclosing function and successful reclosing latch-up protection function in short-term, breaker closing;

D, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function, circuit breaker or on-load switch separating brake;

E, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, on-load switch or breaker closing.

Preferred embodiment is: in communication when normal, is close between the described terminal unit of other transformer stations in open loop point and next-door neighbour's described terminal unit and breaks down, and this terminal unit control is described circuit breaker, protect move as follows:

A, the intelligent controller that is positioned at the described terminal unit of fault point detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker trip;

B, be positioned at fault point described terminal unit intelligent controller start reclosing function and be incorporated into fault after quick tripping function, circuit breaker first closes a floodgate and trips afterwards;

C, the described terminal unit in open loop point that is positioned at fault point subordinate detect adjacent described terminal unit fault message, on-load switch or circuit breaker in described terminal unit in open loop point receive adjacent switch fault message, continue to keep gate-dividing state not close a floodgate.

Preferred embodiment is: in the time being arranged in the intelligent controller generation communication abnormality of described terminal unit of fault point; fault point is positioned at the described terminal unit control range of controlling described circuit breaker; and terminal unit control is on-load switch described in the next stage of this terminal unit, protection action is as follows:

A, the intelligent controller that is arranged in the described terminal unit of fault point detect that fault current flows into but can not receive the fault message of adjacent end unit, starts fast tripping protection function or overcurrent protection function, circuit breaker trip;

If terminal unit control is circuit breaker described in the higher level of B fault point, controls the intelligent controller of circuit breaker and detect that fault current flows into but can not receive the fault message of adjacent end unit, starts fast tripping protection function or overcurrent protection function, circuit breaker trip; Then be positioned at intelligent controller that fault point higher level controls circuit breaker and start to obtain latch-up protection function in short-term after electric coincidence function and successful reclosing;

If terminal unit control is on-load switch described in the higher level of C fault point, again described in higher level terminal unit control be circuit breaker, control the intelligent controller of circuit breaker and detect that fault current flows into but can not receive the fault message of adjacent circuit breaker terminal unit, start fast tripping protection function or overcurrent protection function, circuit breaker trip; The intelligent controller of control overhead switch starts fault current pulse detection function and on-load switch Fault Isolation function, without on-load switch separating brake in electric situation; Then the intelligent controller of controlling circuit breaker starts to obtain latch-up protection function in short-term after electric coincidence function and successful reclosing; The intelligent controller of control overhead switch starts to such an extent that electric time-delay closing also closes a floodgate successfully.

D, the intelligent controller that is arranged in the described terminal unit at fault point place start electric coincidence function and be incorporated into fault after quick tripping function, circuit breaker first closes a floodgate and trips afterwards;

E, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function and residual voltage pulse separating brake blocking function, on-load switch separating brake;

F, the intelligent controller that one of them is close in the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, and circuit breaker or on-load switch close a floodgate.

Preferred embodiment is: in the time being arranged in fault point higher level and controlling the intelligent controller generation communication abnormality of described terminal unit of described circuit breaker; fault point is positioned at the below of the described terminal unit of controlling described on-load switch; and terminal unit control is circuit breaker described in the next stage of this terminal unit, protection action is as follows:

A, the described terminal unit that is positioned at fault point higher level's control circuit breaker detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker trip;

B, the intelligent controller that is positioned at the described terminal unit at fault point place start fault current pulse detection function and on-load switch Fault Isolation function, without on-load switch separating brake in electric situation;

C, the described terminal unit that is positioned at fault point higher level's control circuit breaker start to obtain electric coincidence function, breaker closing;

D, the intelligent controller that is positioned at the described terminal unit at fault point place start to obtain electric time-delay closing function, and on-load switch closes a floodgate;

E, the described terminal unit that is positioned at fault point higher level's control circuit breaker start fast tripping protection function or overcurrent protection function, circuit breaker trip;

F, the intelligent controller that is positioned at the described terminal unit at fault point place start and are incorporated into separating brake blocking function after fault, on-load switch separating brake;

G, the described terminal unit that is positioned at fault point higher level's control circuit breaker start reclosing function, breaker closing;

H, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function, breaker open operation;

I, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, on-load switch or breaker closing.

Preferred embodiment is: when the on-load switch machinery in the described terminal unit at but fault point place normal in communication is failure to actuate extremely; fault point is positioned at the described terminal unit of controlling described on-load switch; and terminal unit control is circuit breaker described in the next stage of this terminal unit, protection action is as follows:

B, the intelligent controller that is positioned at the described terminal unit at fault point place start fault current pulse detection function and on-load switch Fault Isolation function, send separating brake order, because machinery is abnormal, and on-load switch tripping;

C, the described terminal unit that is positioned at fault point higher level's control circuit breaker receive that place, fault point states after the on-load switch tripping signal of terminal unit, lock-reclosing lock function;

D, the described terminal unit that is positioned at fault point next stage are received after the on-load switch tripping signal that is positioned at fault point place, start interlocking dead electricity time delay separating brake blocking function, separating brake;

Preferred embodiment is: when the breaker mechanical in the described terminal unit at but fault point place normal in communication is failure to actuate extremely; fault point is positioned at the described terminal unit below of controlling described circuit breaker; and described in the next stage of this terminal unit, terminal unit is in open loop point, and protection action is as follows:

A, the described terminal unit that is positioned at the control circuit breaker at fault point place detect after fault current, start fast tripping protection function or overcurrent protection function, send trip signal, because machinery is abnormal, and circuit breaker tripping;

B, the described terminal unit that is positioned at fault point higher level, control circuit breaker in backup status receive that place, fault point states after the circuit breaker tripping signal of terminal unit, circuit breaker trip;

The described terminal unit of the control overhead switch between the described terminal unit in described terminal unit and step B in C, steps A starts fault current pulse detection function and on-load switch Fault Isolation function, on-load switch separating brake;

D, be arranged in the described terminal unit that fault point higher level controls circuit breaker and start reclosing function and successful reclosing latch-up protection function in short-term, breaker closing;

E, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point receive that place, fault point states after the circuit breaker tripping signal of terminal unit, and on-load switch or circuit breaker do not close a floodgate in blocking.

According to the network type guard method of a kind of mixed networking based on open loop mode operation provided by the invention compared with prior art tool have the following advantages: the present invention adopts the communication network to equation; communication mutually between terminal unit on circuit; collect the fault message of adjacent switch; make arbitration, realize location fault and isolated fault fast.Possess following several large advantage: be 1. applicable to the mixed networking of circuit breaker and on-load switch, strong to power network switch apparatus adaptability; 2, speed is fast, impacts little to circuit.Because what the present invention adopted is proactive dissemination fault message, rather than the repeating query mode in the past adopting, thereby greatly saved the time.3. logical algorithm is simple and reliable.The logic criterion adopting only need be known the protection starting state of own and adjacent switch, simple and fast and very reliable.4. disobey rascal station.Because of without protection substation, dissolved that substation paralysis may bring risk.5. backup protection is provided.All switches of experiencing fault, if the own non-fault end of judgement proceeds to standby.Once end switch trips unsuccessfully, by back-up switch excision fault.6. strong adaptability.The electric network of electric pressures at different levels can easily be applicable to, and the syndeton of network and the operational mode of system needn't be worried.

Accompanying drawing explanation

Fig. 1 is networking reduced graph of the present invention.

Fig. 2 is another kind of networking reduced graph of the present invention.

Fig. 3 is another networking reduced graph of the present invention.

Embodiment

Referring to Fig. 1, in the network type guard method of a kind of mixed networking based on open loop mode operation provided by the invention, for circuit breaker and the on-load switch mixed networking system of open loop mode operation, described group network system comprises the terminal unit that multiple transformer stations are connected with described transformer station, each described terminal unit comprises intelligent controller and communication module, circuit breaker of each described intelligent controller control or an on-load switch, each described terminal unit is only communicated by letter with the described terminal unit of next-door neighbour by communication module, intelligent controller in each described terminal unit is collected circuit breaker in this terminal unit or the voltage of on-load switch, electric current and fault message that on-load switch in the electric current of flowing through and adjacent terminal unit or circuit breaker are flowed through.

For the terminal unit of controlling described circuit breaker, communicate by letter when normal or abnormal, when intelligent controller in each described terminal unit detects fault current, communicate by letter with adjacent described terminal unit, do not have fault current to flow out during when there being fault current to flow into, illustrate that fault occurs in the switching range of this terminal unit control, the intelligent controller in this terminal unit starts fast tripping protection function or overcurrent protection function and controls the circuit breaker trip in this terminal unit; In the time having fault current to flow into and fault current flows out, illustrate that fault does not occur in the switching range of this terminal unit control, the circuit breaker in this terminal unit of intelligent controller control in this terminal unit is in backup status.

For the terminal unit of controlling described on-load switch; in the time that communication is normal or abnormal; on-load switch self overcurrent; in the time that very short time, internal fault electric current disappeared again; communicate by letter with adjacent described terminal unit, do not have fault current to flow out when there being fault current to flow into, after described on-load switch self decompression defluidization; start separating brake, otherwise be failure to actuate.Very short time in this process is generally the time of higher level's circuit breaker excision fault.

The mixed networking that the present invention provides refers to that circuit breaker and on-load switch mix use.Wherein on-load switch is under rated voltage and rated current.Only allow to switch on and off load current, but do not allow interrupting short circuit.In the time that connection switch is on-load switch, he coordinates with higher level's circuit breaker, removes after fault at higher level's circuit breaker, starts separating brake.Circuit breaker is to carry or unloaded line and electric equipment for having switched on and off, and while being short-circuited, and disengagement failure or again close a floodgate automatically, can play the effect of control and protection two aspects.In the time that connection switch is circuit breaker, it can, after short trouble occurs, cut-off fault current, and requires to carry out one or many reclosing according to setting.In mixed networking, a circuit breaker can be with an on-load switch or multiple on-load switch.Each terminal unit can be controlled a circuit breaker or an on-load switch, also can be controlled at multiple circuit breakers or multiple on-load switch or circuit breaker and on-load switch mixed structure in this terminal unit, such as a ring main unit is set in each terminal unit, each terminal unit can be controlled all circuit breakers and the on-load switch in a ring main unit.Control principle and circuit breaker and on-load switch are similar, arrange according to identical control principle.Circuit breaker that the present invention is given and on-load switch are for convenience of description and understand, as the most basic control unit, be not limitation of the present invention, those of ordinary skills can be according to the most basic control unit, extends in the control unit of multiple switch compositions.In the present invention, so-called switch refers to the general designation of circuit breaker and on-load switch.

In actual applications, as long as same user only has a power supply to power and all can be considered open loop mode the time in office.As shown in Figure 3.The switch 12,16,21 that circuit breaker in Fig. 3 (or on-load switch) 17 left sides connect can be regarded a switches set (be circuit breaker entirely or be that on-load switch or circuit breaker mix with on-load switch entirely) as, and the switch 12,18,22 of right side connection also can be regarded a switches set (be circuit breaker entirely or be that on-load switch or circuit breaker mix with on-load switch entirely) as.In the time breaking down, as long as arbitrary circuit has fault current to flow into circuit breaker (or on-load switch) 17 in left-side switch group, just can be considered and have fault current to flow into; Right side in like manner.Be equivalent to the structure of the switch that the present invention provides, basis for estimation is still the given guard method of the present invention.

In Fig. 3

represent the switch in "on" position;

represent the switch in gate-dividing state.

The main criterion point of circuit breaker in the present invention: main criterion source is the fault current of circuit breaker itself and adjacent on-load switch or circuit breaker; that is: communicate by letter when normal or abnormal; in the time that this breaker protection detects short circuit current, communicate by letter with adjacent on-load switch or breaker protection.While thering is no large outflow of bus current (as opposite side switch protection does not detect protective current) when there being large electric current to flow into (as a side protection detects short circuit current); illustrate that fault occurs in this breaker protection district, start local protection quick-break or overcurrent protection tripping operation.Otherwise own only protection in support.

The main criterion point of on-load switch in the present invention: main criterion source is the fault current of on-load switch itself and adjacent circuit breaker or on-load switch, that is: in the time that communication is normal or abnormal, the on-load switch of fault end self overcurrent, in the time that very short time, internal fault electric current disappeared again, communicate by letter with adjacent circuit breaker or on-load switch protection, there is no large outflow of bus current (as opposite side switch protection does not detect fault current) when there being large electric current to flow into (as a side protection detects short circuit current); After self decompression defluidization, start separating brake.Otherwise be failure to actuate.Very short time in this process is generally the time of higher level's circuit breaker excision fault.

Terminal unit of the present invention is only communicated by letter with adjacent terminal unit, adopts distributed intelligence control mode, and the process information of each terminal unit reduces greatly, has alleviated the load of processor, the time under reach.Communication module in terminal unit in the present invention can be independent setting, can be to be also integrated in intelligent controller.

In the present invention, each described terminal unit has whole or several in following function: fast tripping protection function, overcurrent protection function, reclosing function, obtain electric coincidence function, successful reclosing latch-up protection function in short-term, be incorporated into quick tripping function after fault, fault current pulse detection function, on-load switch Fault Isolation function, obtain electric time-delay closing function, locking separating brake function in short-term after closing a floodgate successfully, be incorporated into separating brake blocking function after fault, interlocking dead electricity time delay separating brake blocking function, not blocking function of dead electricity time delay separating brake, residual voltage pulse separating brake blocking function, one-sided decompression time-delay closing function, the one-sided decompression time-delay closing of inspection locking function.

The concrete meaning of above-mentioned functions is:

1.1, fast tripping protection function

1) network type fast tripping protection function under normal circumstances:

Network service is normal-> self overcurrent and exceed quick-break definite value, and the left and right sides only has a side overcurrent, without " latch-up protection " mark-> switch automatic brake separating;

2) fast tripping protection backup protection function:

Network service is normal-> self overcurrent and exceed quick-break definite value, the equal overcurrent in the left and right sides, without " latch-up protection " mark-> fault current sustainable existence--> standby time delay is to rear switch automatic brake separating;

3) fault-tolerant fast tripping protection function:

Network service is abnormal-> self overcurrent and exceed quick-break definite value; the left and right sides finds that there is a side overcurrent or without overcurrent, without " latch-up protection " mark-> switch automatic brake separating--the fault-tolerant tripping operation flag set of >.

1.2, overcurrent protection function

1) network type overcurrent protection function under normal circumstances:

Network service is normal-> self overcurrent and exceed overcurrent definite value but be less than quick-break definite value, the left and right sides only has a side overcurrent, without arrive-> switch automatic brake separating of " latch-up protection " mark-> delay time;

2) overcurrent protection emergency function

Network service is normal-> self overcurrent and exceed overcurrent definite value but be less than quick-break definite value, the equal overcurrent in the left and right sides, adds that without " latch-up protection " mark-> overcurrent delay time standby delay time is to rear-> switch automatic brake separating;

3) fault-tolerant overcurrent protection function:

Network service is abnormal-> self overcurrent and exceed overcurrent definite value but be less than quick-break definite value; the left and right sides finds that there is a side overcurrent (or without overcurrent), without arrive-> switch automatic brake separating--the fault-tolerant fault trip flag set of > of " latch-up protection " mark-> delay time.

1.3, reclosing function

1) the reclosing function under normal condition

Communication under normal circumstances, after switch quick-break/overcurrent protection tripping operation, switch does not indicate without " lock-reclosing lock " at co-bit->, be more than or equal to 1 without " residual voltage pulse "-> " coincidence number of times ", arrive-> switch automatic closing of " fault trip " flag set-> delay time;

2) the reclosing function after backup protection action

Communication under normal circumstances; after switch quick-break/overcurrent backup protection tripping operation; switch does not indicate without " lock-reclosing lock " at co-bit->; be more than or equal to 1 without " residual voltage pulse "-> " coincidence number of times ", arrive-> switch automatic closing of " fault trip " flag set-> delay time.

1.4, obtain electric coincidence function

Reclosing function under fault-tolerant state:

Switch one side has pressure--and > switch is not in co-bit-> " fault-tolerant fault trip " flag set, without " locking obtains electric coincidence " mark, without " residual voltage pulse ", switch one side has arrive-> switch automatic closing of pressure-> delay time.

1.5, successful reclosing latch-up protection function in short-term

" reclosing " or " obtaining electric coincidence " successful reclosing-> " latch-up protection mark " set, the electric current that breaks down (the fault current duration is greater than protection time delay, is less than protection time delay+latch-up protection time delay in short-term)--arrive-> " latch-up protection mark " of be failure to actuate-> of > protection delay time removes.

1.6, be incorporated into quick tripping function after fault

After switch co-bit-> " reclosing " or " obtaining electric coincidence " overlap, detect that overcurrent-> sets arrive-> switch automatic brake separating of delay time.

1.7, fault current pulse detection function

Self overcurrent, fault disappears again within a certain period of time, down pulse set.

1.8, on-load switch Fault Isolation function

1) Fault Isolation under normal condition:

Switch co-bit-> communication is normal, > " separating brake locking " flag set that " down pulse " flag set--> communicates by letter with adjacent switch, and adjacent switch one side has overcurrent opposite side without overcurrent--> self decompression defluidization-> switch automatic brake separating locking--

2) Fault Isolation under fault-tolerant state

Switch co-bit-> communication abnormality (nothing communication or only a side have communication), > " not locking of separating brake " flag set that " down pulse " flag set--> communicates by letter with adjacent switch, and there is a side overcurrent (or completely without overcurrent) left and right sides--> self decompression defluidization-> switch automatic brake separating--

1.9, obtain electric time-delay closing function

Switch divides position-> without " residual voltage pulse ", " not locking of separating brake " flag set, and without separating brake locking mark, switch one side has arrive-> switch automatic closing of pressure-> delay time.

1.10, locking separating brake function in short-term after closing a floodgate successfully

Switch is in a point position, and--> obtains electric time-delay closing, and--> is setting in the time limit and fault current do not detected--> starts locking separating brake mark (delay time can be set)-> delay time in short-term and arrives rear--, and > removes " locking separating brake in short-term " mark.

1.11, be incorporated into fault separating brake blocking function

----> separating brake locking that > is setting in the time limit and fault current detected--> detects with no pressure without stream again--that > obtains electric time-delay closing that switch is in a point position.

1.12, interlocking dead electricity time delay separating brake blocking function

Normal (extremely)-> self the decompression defluidization of network service; receive that adjacent switch " protection fault trip " (or " on-load switch fault trip ") mark-> delay time arrives-> switch automatic brake separating locking, puts " separating brake locking " flag bit.

1.13, not blocking function of dead electricity time delay separating brake

Be generally used for the switch of next-door neighbour's power supply:

Self decompression defluidization-> delay time is to-not locking of > switch automatic brake separating.

1.14, residual voltage pulse separating brake blocking function

Switch divides position, detects that residual voltage pulse-> " not locking of separating brake " mark is converted to " separating brake locking " mark.

1.15, one-sided decompression time-delay closing function

Even if this functional requirement can not be confirmed adjacent switch fault-free, decompression turns confession after also can time delay:

Switch divides position-> switch one side to have pressure, without " locking turns confession " mark, and the undesired or arrive-> switch automatic closing of normal adjacent switch fault-free trip mark-> delay time of communicating by letter of communicating by letter.

1.16, the one-sided decompression time-delay closing of inspection locking function

This functional requirement only has the adjacent switch of confirmation fault-free mark just likely to turn confession:

Switch divide position-> network service normal-> switch one side has pressure, without " locking turns confession " mark, arrive-> switch automatic closing of adjacent switch fault-free trip mark-> delay time.

Below in conjunction with networking reduced graph, illustrate while breaking down guard method embodiment of the present invention:

Fig. 1 is the mixed networking reduced graph of open loop mode operation.S1, S3 are circuit breaker, and T2, T4 are on-load switch; S1, T2, S3 system are "on" position while normally operation; T4 is interconnection switch, is gate-dividing state when system is normally moved, thereby forms open loop mode; One station terminal (including two groups of PT) comprises communication module, intelligent controller and by intelligent controller control circuit breaker or on-load switch, between described terminal unit by switch information to each other alternately.In Fig. 1, provide Liao Liangge transformer station, the wire-outgoing breaker CB1 of transformer station, the CB2 reclosing function of adjusting No. 1 time.

Embodiment 1, in communication when normal, breaks down between the described terminal unit that is close to closed transformer station and closed transformer station, and be close to closed transformer station described terminal unit control be described circuit breaker, i.e. F1 place, fault point in Fig. 1, protect move as follows:

Wire-outgoing breaker CB1 in A, the closed ES1 of transformer station detects after fault current, starts fast tripping protection function or overcurrent protection function;

Wire-outgoing breaker CB1 in B, the closed ES1 of transformer station starts reclosing function subsequently;

Wire-outgoing breaker CB1 in C, the closed ES1 of transformer station detects after fault current again, fast trip; Complete the isolation of fault point.

D, the intelligent controller being close in the described terminal unit of the closed ES1 of transformer station start not blocking function and residual voltage pulse separating brake blocking function of dead electricity time delay separating brake, circuit breaker S1 separating brake;

E, the intelligent controller that one of them is close in the described terminal unit of the ES2 of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, and on-load switch T4 closes a floodgate.Realization turns power supply.

Embodiment 2, in communication, when normal, fault point is positioned at the described terminal unit of controlling described circuit breaker, and described in the next stage of this terminal unit terminal unit control be on-load switch, i.e. fault point F2 in Fig. 1, protection action is as follows:

A, the intelligent controller that is positioned at the described terminal unit at fault point place detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker S1 tripping operation;

B, be positioned at fault point place described terminal unit intelligent controller start reclosing function and be incorporated into fault after quick tripping function, circuit breaker S1 first closes a floodgate and trips afterwards;

C, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function, on-load switch T2 separating brake; Realize the isolation of fault point.

D, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, and on-load switch T4 closes a floodgate.Realization turns power supply.

Fault point higher level circuit breaker refers to the circuit breaker of traction fault point place on-load switch in the present invention, and fault point subordinate circuit breaker refers to the circuit breaker of traction fault point next stage on-load switch.Fault point next stage on-load switch refers to the on-load switch of the other side in fault point.Following examples are identical.

Embodiment 3, in the time that communication is normal, fault point is positioned at the described terminal unit of controlling described on-load switch, i.e. fault point F3 in Fig. 1, protection action is as follows:

A, the described terminal unit that is arranged in fault point higher level's control circuit breaker S1 detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker S1 tripping operation;

B, the intelligent controller that is positioned at the described terminal unit at fault point place start fault current pulse detection function and on-load switch Fault Isolation function, on-load switch T2 separating brake;

C, the described terminal unit that is arranged in fault point higher level's control circuit breaker S1 start reclosing function and successful reclosing latch-up protection function in short-term, and circuit breaker S1 closes a floodgate;

D, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function, circuit breaker S3 separating brake; Realize the isolation to fault point.

E, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, and on-load switch T4 closes a floodgate.Realization turns power supply.

Embodiment 4, in communication when normal, is close between the described terminal unit of other transformer stations in open loop point and next-door neighbour's described terminal unit and breaks down, and this terminal unit control is described circuit breaker, i.e. fault point F4 in Fig. 1, protect move as follows:

A, the intelligent controller that is positioned at the described terminal unit of fault point detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker S3 tripping operation;

B, be positioned at fault point described terminal unit intelligent controller start reclosing function and be incorporated into fault after quick tripping function, circuit breaker S3 first closes a floodgate and trips afterwards; Realize the isolation to fault point.

C, the described terminal unit in open loop point that is positioned at fault point subordinate detect adjacent described terminal unit fault message, and the on-load switch T4 in the described terminal unit in open loop point continues to keep gate-dividing state not close a floodgate.

Can find out by above-mentioned four embodiment, in the time breaking down, electric current and fault message that the present invention can flow through according to the on-load switch in the voltage of circuit breaker or on-load switch, the electric current of flowing through and adjacent terminal unit or circuit breaker, realize fast action, location isolated fault point, and turn power supply.

Embodiment 5; in the time being arranged in the communication module generation communication abnormality of described terminal unit of fault point; fault point is positioned at the described terminal unit below of controlling described circuit breaker; and described in the next stage of this terminal unit, terminal unit control is on-load switch; in Fig. 1, F2 point breaks down; the terminal unit generation communication abnormality at circuit breaker S1 place, protection action is as follows:

A, the intelligent controller that is arranged in the described terminal unit of fault point detect fault current, but can not receive the fault message of adjacent end unit, start fast tripping protection function or overcurrent protection function, circuit breaker S1 tripping operation;

B, the intelligent controller that is arranged in the described terminal unit at fault point place start electric coincidence function and be incorporated into fault after quick tripping function, circuit breaker S1 first closes a floodgate and trips afterwards; Circuit breaker S1 tripping operation-close a floodgate-tripping operation, is equivalent to produce a pulse signal.

C, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function and residual voltage pulse separating brake blocking function, on-load switch T2 separating brake; Realize the isolation to fault point.

D, the intelligent controller that one of them is close in the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, and on-load switch T4 closes a floodgate.Realization turns power supply.

Embodiment 6; in the time being arranged in fault point higher level and controlling the intelligent controller generation communication abnormality of described terminal unit of described circuit breaker; fault point is positioned at the described terminal unit below of controlling described on-load switch; and described in the next stage of this terminal unit, terminal unit control is circuit breaker; the F3 in Fig. 1 breaks down; the terminal unit generation communication abnormality at circuit breaker S1 place, protection action is as follows:

A, the described terminal unit that is positioned at fault point higher level's control circuit breaker S1 detect after fault current, start fast tripping protection function or overcurrent protection function, circuit breaker S1 tripping operation;

C, the described terminal unit that is positioned at fault point higher level's control circuit breaker S1 start to obtain electric coincidence function, and circuit breaker S1 closes a floodgate;

D, the intelligent controller that is positioned at the described terminal unit at fault point place start to obtain electric time-delay closing function, and on-load switch T2 closes a floodgate;

E, the described terminal unit that is positioned at fault point higher level's control circuit breaker S1 start fast tripping protection function or overcurrent protection function, circuit breaker S1 tripping operation;

F, the intelligent controller that is positioned at the described terminal unit at fault point place start and are incorporated into separating brake blocking function after fault, on-load switch T2 separating brake;

G, the described terminal unit that is positioned at fault point higher level's control circuit breaker S1 start reclosing function, and circuit breaker S1 closes a floodgate;

H, the intelligent controller that is positioned at the described terminal unit of fault point next stage start interlocking dead electricity time delay separating brake blocking function, circuit breaker S3 separating brake; Isolated fault point.

I, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, and on-load switch T4 closes a floodgate.Realization turns power supply.

Embodiment 7; when on-load switch machinery in the described terminal unit at but fault point place normal in communication is failure to actuate extremely; fault point is positioned at the described terminal unit of controlling described on-load switch; and described in the next stage of this terminal unit, terminal unit control is circuit breaker; in Fig. 1, F3 place breaks down; on-load switch T2 tripping, protection action is as follows:

B, the intelligent controller that is positioned at the described terminal unit at fault point place start fault current pulse detection function and on-load switch Fault Isolation function, send separating brake order, because machinery is abnormal, and on-load switch T2 tripping;

C, the described terminal unit that is positioned at fault point higher level's control circuit breaker S1 receive that place, fault point states after the on-load switch T2 tripping signal of terminal unit, lock-reclosing lock function;

D, the described terminal unit (being the terminal unit at circuit breaker S3 place) that is positioned at fault point next stage are received after the on-load switch T2 tripping signal that is positioned at fault point place, start interlocking dead electricity time delay separating brake blocking function, circuit breaker S3 separating brake;

E, the intelligent controller that one of them is close to the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or the one-sided decompression time-delay closing of inspection locking function, and on-load switch T4 closes a floodgate.

Embodiment 8; when breaker mechanical in the described terminal unit at but fault point place normal in communication is failure to actuate extremely; fault point is positioned at the described terminal unit below of controlling described circuit breaker; and described in the next stage of this terminal unit, terminal unit is in open loop point; in Fig. 1, F4 place breaks down; circuit breaker S3 tripping, protection action is as follows:

A, the described terminal unit that is positioned at the control circuit breaker S3 at fault point place detect after fault current, start fast tripping protection function or overcurrent protection function, send trip signal, because machinery is abnormal, and circuit breaker S3 tripping;

B, the described terminal unit that is positioned at fault point higher level, control circuit breaker S1 in backup status receive that place, fault point states after the circuit breaker S3 tripping signal of terminal unit, start fast tripping protection function or overcurrent protection function, circuit breaker S1 tripping operation;

The described terminal unit of control overhead switch T2 between described terminal unit in described terminal unit and step B in C, steps A starts fault current pulse detection function and on-load switch Fault Isolation function, on-load switch T2 separating brake;

D, be arranged in the described terminal unit that fault point higher level controls circuit breaker S1 and start reclosing function and successful reclosing latch-up protection function in short-term, circuit breaker S1 closes a floodgate;

E, one of them is close to the on-load switch T4 of the described terminal unit of other transformer stations in open loop point or circuit breaker and starts and receive that place, fault point states after the circuit breaker tripping signal of terminal unit, does not close a floodgate in blocking.

Referring to Fig. 2, the networking reduced graph of another open loop mode operation that the present invention provides.T1, T2, T3, T4 are on-load switch; T1, T2, T3 system are "on" position while normally operation; T4 is interconnection switch, is gate-dividing state when system is normally moved; One station terminal unit (including two groups of PT) comprises communication module, intelligent controller and by on-load switch of intelligent controller control, by switch information to each other alternately; The wire-outgoing breaker CB1 of transformer station, the CB2 reclosing function of adjusting No. 2 times.

The protection philosophy of the present embodiment is same as the previously described embodiments, and for example, in the time that communication is normal, F1 place, fault point breaks down, and course of action is as follows:

Wire-outgoing breaker CB1 in A, closed transformer station experiences after fault current, fast tripping protection action;

Wire-outgoing breaker CB1 reclosing action in B, closed transformer station;

Wire-outgoing breaker CB1 in C, closed transformer station is incorporated into after fault, fast trip;

Wire-outgoing breaker CB1 reclosing action in D, closed transformer station;

Wire-outgoing breaker CB1 in E, closed transformer station is incorporated into after fault, fast trip;

F, the intelligent controller being close in the described terminal unit of closed transformer station start not blocking function and residual voltage pulse separating brake blocking function of dead electricity time delay separating brake; On-load switch T1 separating brake;

G, the intelligent controller that one of them is close in the described terminal unit of other transformer stations in open loop point start one-sided decompression time-delay closing function or inspection locking one-sided decompression time-delay closing function (both only have and adjust), and on-load switch T4 closes a floodgate.

In the time that communication is normal, F2 place, fault point breaks down, and protection course of action is as follows:

Intelligent controller in the terminal unit at B, on-load switch T1 place starts fault current pulse detection function and on-load switch Fault Isolation function; On-load switch T1 separating brake;

Wire-outgoing breaker CB1 reclosing action in C, closed transformer station; Close a floodgate;

Intelligent controller in the terminal unit at D, on-load switch T2 place starts interlocking dead electricity time delay separating brake blocking function; On-load switch T2 separating brake;

Intelligent controller in the terminal unit at E, on-load switch T4 place starts one-sided decompression time-delay closing function or inspection locking one-sided decompression time-delay closing function (both only have and adjust), and on-load switch T4 closes a floodgate.

In the time that communication is normal, F3 place, fault point breaks down, and protection course of action is as follows:

Intelligent controller in the terminal unit at B, on-load switch T2 place starts fault current pulse detection function and on-load switch Fault Isolation function; On-load switch T2 separating brake;

Intelligent controller in the terminal unit at D, on-load switch T3 place starts interlocking dead electricity time delay separating brake blocking function; On-load switch T3 separating brake;

Communicate by letter when normal, F4 place, fault point breaks down, and protection course of action is as follows:

Intelligent controller in the terminal unit at B, on-load switch T3 place starts fault current pulse detection function and on-load switch Fault Isolation function; On-load switch T3 separating brake;

Intelligent controller in the terminal unit at D, on-load switch T4 place detects adjacent switch fault trip, does not close a floodgate in blocking;

In the time of the terminal unit generation communication abnormality at on-load switch T1 place, the F1 of fault point place breaks down, and protection course of action is as follows:

Wire-outgoing breaker CB1 reclosing action in B, closed transformer station;

Wire-outgoing breaker CB1 reclosing action in D, closed transformer station;

Intelligent controller in the terminal unit at F, on-load switch T1 place starts not blocking function and residual voltage pulse separating brake blocking function of dead electricity time delay separating brake; On-load switch T1 separating brake;

Intelligent controller in the terminal unit at G, on-load switch T2 place starts interlocking dead electricity time delay separating brake blocking function; Separating brake;

Intelligent controller in the terminal unit at H, on-load switch T4 place starts " one-sided decompression time-delay closing " function or " the one-sided decompression time-delay closing of inspection locking " function (both only have and adjust), and on-load switch T4 closes a floodgate;

Intelligent controller in the terminal unit at I, on-load switch T2 place starts to obtain electric time-delay closing function; Close a floodgate.

In the time of the terminal unit generation communication abnormality at on-load switch T1 place, F2 place, fault point breaks down, and protection course of action is as follows:

Intelligent controller in the terminal unit at D, on-load switch T1 place starts to obtain electric time-delay closing function; On-load switch T1 closes a floodgate.

Wire-outgoing breaker CB1 in E, closed transformer station experiences after fault current, fast tripping protection action;

Intelligent controller in the terminal unit at F, on-load switch T1 place starts and is incorporated into separating brake blocking function after fault; On-load switch T1 separating brake;

Wire-outgoing breaker CB1 reclosing action in G, closed transformer station; Close a floodgate;

Intelligent controller in the terminal unit at H, on-load switch T2 place starts interlocking dead electricity time delay separating brake blocking function and residual voltage pulse separating brake blocking function; On-load switch T2 separating brake;

Intelligent controller in the terminal unit at I, on-load switch T4 place starts one-sided decompression time-delay closing function or inspection locking one-sided decompression time-delay closing function (both only have and adjust), and on-load switch T4 closes a floodgate.

Communicate by letter when normal, F2 place, fault point breaks down, on-load switch T2 tripping, and protection course of action is as follows:

Intelligent controller in the terminal unit at D, on-load switch T2 place starts interlocking dead electricity time delay separating brake blocking function; Send out separating brake order; But because machinery is abnormal, on-load switch T2 tripping;

Intelligent controller in the terminal unit at E, on-load switch T3 place is received after the switch failure signal of on-load switch T2, starts interlocking dead electricity time delay separating brake blocking function; On-load switch T3 separating brake;

Intelligent controller in the terminal unit at F, on-load switch T4 place starts " one-sided decompression time-delay closing " function or " the one-sided decompression time-delay closing of inspection locking " function (both only have and adjust), and on-load switch T4 closes a floodgate.

Communicate by letter when normal, F3 place, fault point fault, on-load switch T3 tripping, protection course of action is as follows:

Intelligent controller in the terminal unit at D, on-load switch T3 place starts " locking of interlocking dead electricity time delay separating brake " function; Send out separating brake order; But because machinery is abnormal, on-load switch T3 tripping;

E, on-load switch T4 receive after the switch failure signal of on-load switch T3, do not close a floodgate in blocking.

In the above-mentioned enforcement providing in the present invention, each step can be repeatedly according to the integration number of times of setting, and some step is wherein synchronously to carry out, and also has the sequencing of some steps to exchange.Sequence of movement according to the power supply of power supply or electric and determine.What in the above-described embodiment providing in the present invention, start correlation function is all the intelligent controllers in terminal unit, and separating brake, tripping operation or combined floodgate is all circuit breaker or on-load switch.

Can clearly learn that by above-described embodiment the present invention is not only applicable to the protection under normal condition, and can also realize the protection when abnormal for communication failure and machinery.Locate fast flexibly the fault under all kinds of situations in quarantine networking.

Claims

1. the network type guard method of the mixed networking based on open loop mode operation, for circuit breaker and the on-load switch mixed networking system of open loop mode operation, described group network system comprises the terminal unit that multiple transformer stations are connected with described transformer station, it is characterized in that: each described terminal unit comprises intelligent controller and communication module, each described intelligent controller control circuit breaker or on-load switch, each described terminal unit is only communicated by letter with the described terminal unit of next-door neighbour, intelligent controller in each described terminal unit is collected circuit breaker in this terminal unit or the voltage of on-load switch, electric current and fault message that on-load switch in the electric current of flowing through and adjacent terminal unit or circuit breaker are flowed through.

For the terminal unit of controlling described circuit breaker, when intelligent controller in each described terminal unit detects fault current, communicate by letter with adjacent described terminal unit, do not have fault current to flow out during when there being fault current to flow into, illustrate that fault occurs in the switching range of this terminal unit control, the intelligent controller in this terminal unit starts fast tripping protection function or overcurrent protection function and controls the circuit breaker trip in this terminal unit; In the time having fault current to flow into and fault current flows out, illustrate that fault does not occur in the switching range of this terminal unit control, the circuit breaker in this terminal unit of intelligent controller control in this terminal unit is in backup status.

For the terminal unit of controlling described on-load switch, on-load switch self overcurrent, in the time that very short time, internal fault electric current disappeared again, communicate by letter with adjacent described terminal unit, do not have fault current to flow out when there being fault current to flow into, described on-load switch self decompression defluidization, starts separating brake, otherwise is failure to actuate.Very short time in this process is generally the time of higher level's circuit breaker excision fault.

2. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 1, it is characterized in that: each described terminal unit has whole or several in following function: fast tripping protection function, overcurrent protection function, reclosing function, obtain electric coincidence function, successful reclosing latch-up protection function in short-term, be incorporated into quick tripping function after fault, fault current pulse detection function, on-load switch Fault Isolation function, obtain electric time-delay closing function, locking separating brake function in short-term after closing a floodgate successfully, be incorporated into separating brake blocking function after fault, interlocking dead electricity time delay separating brake blocking function, not blocking function of dead electricity time delay separating brake, residual voltage pulse separating brake blocking function, one-sided decompression time-delay closing function, the one-sided decompression time-delay closing of inspection locking function.

3. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2; it is characterized in that: in the time that communication is normal; be close between the circuit breaker of described terminal unit of closed transformer station or on-load switch and closed transformer station and break down; and be close to closed transformer station described terminal unit control be described circuit breaker, protection action is as follows:

4. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2; it is characterized in that: in the time that communication is normal; fault point is positioned at the described terminal unit below of controlling described circuit breaker; and terminal unit control is on-load switch or circuit breaker described in the next stage of this terminal unit, protection action is as follows:

5. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2, is characterized in that: in the time that communication is normal, fault point is positioned at the described terminal unit of controlling described on-load switch, and protection action is as follows:

B, the intelligent controller that is positioned at the described terminal unit at fault point place start fault current pulse detection function and on-load switch Fault Isolation function, on-load switch separating brake;

6. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2; it is characterized in that: in the time that communication is normal; be close between the described terminal unit of other transformer stations in open loop point and next-door neighbour's described terminal unit and break down; and this terminal unit control is described circuit breaker, protection action is as follows:

C, the described terminal unit in open loop point that is positioned at fault point subordinate detect adjacent described terminal unit fault message, and the on-load switch in the described terminal unit in open loop point or circuit breaker continue to keep gate-dividing state not close a floodgate.

7. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2; it is characterized in that: in the time being arranged in the intelligent controller generation communication abnormality of described terminal unit of fault point; fault point is positioned at the described terminal unit of controlling described circuit breaker; and terminal unit control is on-load switch described in the next stage of this terminal unit, protection action is as follows:

A, the intelligent controller that is arranged in the described terminal unit of fault point detect fault current, but can not receive the fault message of adjacent end unit, start fast tripping protection function or overcurrent protection function, circuit breaker trip;

8. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2; it is characterized in that: in the time being arranged in fault point higher level and controlling the intelligent controller generation communication abnormality of described terminal unit of described circuit breaker; fault point is positioned at the described terminal unit below of controlling described on-load switch; and terminal unit control is circuit breaker described in the next stage of this terminal unit, protection action is as follows:

9. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2; it is characterized in that: when the on-load switch machinery in the described terminal unit at but fault point place normal in communication is failure to actuate extremely; fault point is positioned at the described terminal unit below of controlling described on-load switch; and terminal unit control is circuit breaker described in the next stage of this terminal unit, protection action is as follows:

10. the network type guard method of the mixed networking based on open loop mode operation as claimed in claim 2; it is characterized in that: when the breaker mechanical in the described terminal unit at but fault point place normal in communication is failure to actuate extremely; fault point is positioned at the described terminal unit below of controlling described circuit breaker; and described in the next stage of this terminal unit, terminal unit is in open loop point, and protection action is as follows: