CN1812226A

CN1812226A - Adaptive master variable, parent connection and connecting line stand-by dispensing device and realizing method

Info

Publication number: CN1812226A
Application number: CN 200510045753
Authority: CN
Inventors: 刘忠政; 刘少宇
Original assignee: LIAONING ELECTRIC POWER CO Ltd LIAOYANG POWER SUPPLY Co
Current assignee: LIAONING ELECTRIC POWER CO Ltd LIAOYANG POWER SUPPLY Co
Priority date: 2005-01-25
Filing date: 2005-01-25
Publication date: 2006-08-02

Abstract

The invention includes screen cabinet and current detection return circuit and control circuit set on the screen cabinet. Its technical key point: control circuit includes voltage detection return circuit; on-off closed return circuit; starting loop and backup power automatic switch control return circuit. The said current detection return circuit consists of ten loops at most. Each loop collects one current analog quantity, therein, two analog quantities are used for two main transformers to detect non-current latching; two analog quantities are used for representing the two main transformers overloading; the other analog quantities are used for reflecting less than six connecting lines overloading after outomatic switching. The realization of varies backup power automatic switching in arrangement is along with one change of system running mode to automatic change its automatic switching mode. It resolves the configuration problem of 220KV power substation backup power automatic switch device.

Description

Adaptive master variable, female connection and interconnection backup auto-activating device and implementation method

(1) technical field

The present invention relates to 220KV and the main transformer of following electric substation, female connection and interconnection backup auto-activating device in the electric power system.

(2) background technology

Backup auto-activating device is used commonplace in the following electric substation of 66KV; the backup auto-activating device that is suitable for 220KV electric substation is not then found as yet; prepared auto restart from present each manufacturer's production; all be to take the equipment of 66KV to copy mechanically and apply indiscriminately toward the electric substation of 220KV; all having ignored 220KV electric substation low-pressure side is double-bus; interconnection is arranged; small power supply is arranged; normally operate to these characteristics of paired running; particularly when running into different faults and abnormal conditions; the prepared auto restart mode is single; in case locking is all lockings just; locking; jumping is explained and interconnection does not have selectivity; what this closed does not conform to; the jumping that should not jump is explained; usually cause unnecessary power failure phenomenon; in addition; owing to backup auto-activating device does not design for 220KV specially; therefore; backup auto-activating device is complex structure not only; and cost is also very high; each Utilities Electric Co. all selects the microcomputer prepared auto restart for use at present; but the Microcomputer Protection disadvantage is that program is made mistakes and caused deadlock sometimes, and its reliability is had a greatly reduced quality, and the analog quantity of backup auto-activating device and uncomplicated; it is simple current/voltage; do not need complicated calculating, when microcomputer realized that protection goes wrong, the field adjustable personnel can not in time handle; must wait the messenger of producer, maintenance is handled very inconvenient.

(3) summary of the invention

The technical scheme that the object of the present invention is to provide a kind of adaptive master variable, female connection and interconnection backup auto-activating device to adopt is:

Adaptive master variable, female connection and interconnection backup auto-activating device, comprise the screen cabinet and be arranged on interior current detection circuit and the control circuit of screen cabinet, control circuit comprises the voltage detecting loop, the circuit breaker lock loop, start loop and prepared auto restart control loop, its technical essential is: described current detection circuit, constitute by ten loops at most, a current analog amount is gathered in each loop, wherein, two analog quantitys are used for two main transformers and detect the locking of nothing stream, also have two analog quantitys to be used to reflect two main transformer overloads, other analog quantity is used to reflect six overloads of following interconnection after hauling oneself willingly into; Described voltage detecting loop, constitute by eight loops, a voltage analog is gathered in each loop, the voltage of per two voltage analog quantitative response main transformer high and low pressure sides, and eight voltage analogs are not all directly taken from busbar voltage, and must be after the main transformer disconnecting link closes, with the busbar voltage of main transformer knife switch secondary contact control; Described switching value locked loop is gathered five switching values, and promptly main transformer first and second switch and bus connection switch are selected two locked loops for use, and promptly hand is jumped locking, external fault locking, and it is the total locking of device that hand is jumped locking, the lockable part prepared auto restart of external fault locking; Described start loop adopts two cover loops, the analog quantity that the first cover loop reflection #1 becomes and the variable quantity of switch, and analog quantity and switch change amount that the second cover loop reflection #2 becomes, this two covers start loop all works to different prepared auto restarts; Described prepared auto restart control loop comprises main transformer prepared auto restart control loop, female connection prepared auto restart control loop, interconnection prepared auto restart control loop; The realization of three kinds of prepared auto restarts can realize its corresponding function automatically with the primary system changes of operating modes in the described control loop, and when adapting to main secondary and bus connection switch tripping to the influence of prepared auto restart.

Dispose in the above-mentioned control loop and jump the small power supply loop;

Dispose overload connection switchback road in the above-mentioned control loop;

Dispose main secondary switch tripping in the above-mentioned control loop and jump female connection loop;

Dispose a plurality of signal circuits in the above-mentioned control loop;

Dispose in the above-mentioned control loop and be used for the loop that telemechanical apparatus is controlled four road voltages and controlled direct current broken string, prepared auto restart initiating signal;

The prepared auto restart implementation method:

1, hauls oneself willingly into function

Two main transformer paired runnings, a main transformer generation internal short circuit fault, the both sides switch of fault main transformer all disconnects, and realizes the interconnection prepared auto restart, does not jump small power supply.

Two main transformer paired runnings, a main transformer generation internal short circuit fault, the tripping of fault main transformer master secondary switch, after the prepared auto restart starting, jump fault bus small power supply earlier, before closing interconnection, the tripping bus connection switch, the interconnection that is connected on non-fault bus is carried out prepared auto restart, and the interconnection that is connected on fault bus is by locking;

Two main transformer paired runnings, main transformer low-pressure side fault, main transformer backup protection action, at first excise bus connection switch, excise the both sides switch of fault bus side main transformer again, after the prepared auto restart starting, the small power supply of tripping fault bus side, locking fault bus side interconnection, non-fault side interconnection is carried out prepared auto restart;

Two main transformer paired runnings, main transformer low-pressure side fault, the bus connection switch tripping, two main transformer protections all move, each side switch of tripping, because prepared auto restart receives block signal, prepared auto restart is by locking, electric substation's full cut-off;

Two main transformers division operation, a main transformer generation internal fault, the both sides switch all disconnects, and prepared auto restart starting back tripping fault bus side small power supply is carried out female connection and interconnection prepared auto restart;

Two main transformers division operation, a main transformer generation internal fault, the tripping of main secondary switch, after the prepared auto restart starting, tripping fault main transformer side small power supply, female connection prepared auto restart is by locking, the interconnection that is connected on fault main transformer side is also by locking, and non-fault main transformer side interconnection is carried out prepared auto restart.

Two main transformers division operation, main transformer low-pressure side generation external fault, main transformer backup protection action excision both sides switch, after the prepared auto restart starting, the result of generation is the same.

A main transformer operation, another main transformer stand-by heat.Operation main transformer generation internal fault, after the prepared auto restart starting, all small power supplies of tripping are carried out the main transformer prepared auto restart;

A main transformer operation, another main transformer stand-by heat.Operation main transformer generation internal fault, the tripping of main secondary switch, after the prepared auto restart starting, all small power supplies of tripping, through short time delay tripping bus connection switch, after standby main transformer is hauled oneself willingly into the load of non-fault side bus;

A main transformer operation, another main transformer stand-by heat.Operation main transformer low-pressure side generation external fault, backup protection action excision bus connection switch and main transformer both sides switch, after the prepared auto restart starting, all small power supplies of tripping, after standby main transformer is hauled oneself willingly into the load of non-fault side bus.

A main transformer operation, another main transformer stand-by heat.Operation main transformer generation external fault, the backup protection action, the bus connection switch tripping, the excision of main transformer two switches, all small power supplies of prepared auto restart starting back tripping, standby main transformer are by locking, electric substation's full cut-off;

A main transformer operation, another main transformer maintenance.Operation main transformer generation internal short-circuit accident, main transformer both sides switch is disconnected, and after the prepared auto restart starting, all small power supplies of tripping are carried out the interconnection prepared auto restart;

A main transformer operation, another main transformer maintenance.Operation main transformer generation internal fault, the tripping of main secondary switch, after the prepared auto restart starting, all small power supplies of tripping, time-delay excision bus connection switch, fault main transformer side interconnection are by locking, and non-fault side interconnection is hauled oneself willingly into the band portion load.

A main transformer operation, another main transformer maintenance.Operation main transformer low-pressure side generation external fault, backup protection excision both sides switch and bus connection switch, after the prepared auto restart starting, all small power supplies of tripping, fault main transformer side interconnection are by locking, and non-fault side interconnection is hauled oneself willingly into the band portion load.

A main transformer operation, another main transformer maintenance.Operation main transformer low-pressure side generation external fault, backup protection excision both sides switch and bus connection switch, after the prepared auto restart starting, all small power supplies of tripping, fault main transformer side interconnection are by locking, and non-fault side interconnection band portion is loaded.

The tripping of above-mentioned fault bus connection switch, interconnection are respectively hauled oneself willingly into by locking, electric substation's full cut-off.

Under the various operational modes, main transformer first and second switch takes place steal jumping, action behavior is with the normal condition of main transformer internal fault.

When the main transformer of various operational modes, because primary system breaks down, make once to lose power supply, respectively haul oneself willingly into delayed firing, realize the interconnection prepared auto restart.

Hand trip(ping), prepared auto restart is inoperative.

When busbar fault, selective excision, with the main transformer external fault, it is not inoperative not have when selection prepared auto restart.

Not charged backup auto-activating device, even the criterion of starting conditions occurred, prepared auto restart is inoperative.

2, charge circuit criterion

Main first and second switch is closing the position, and high and low pressure side all has voltage, and no hand is jumped block signal, then device charging, and realize self-sustaining.Have only hand trip(ping) hand to occur and jump after locking amount or prepared auto restart finish the work, could remove maintenance.

3, start loop criterion and course of action

3.1 under the intact prerequisite of charging, no hand is jumped the locking amount, main transformer no current, main transformer high-pressure side or low-pressure side non-transformer, the tripping operation outlet of delayed firing prepared auto restart.

3.2 under the intact prerequisite of charging, no hand is jumped the locking amount, the main transformer no current, and main transformer high-pressure side or low-side switch are in disconnected position, and the tripping operation of Fast starting prepared auto restart exports.

3.3 after tripping operation outlet action, promptly start the prepared auto restart time component.

3.4 after the prepared auto restart tripping operation outlet action, jump this side high and low pressure side switch.

3.5 the small power supply outlet is jumped in the short time delay starting by time component.

3.6 after the time, element reached setting time, make the starting element action.

3.7 two cover start loops are all identical.

4, main transformer prepared auto restart criterion

Precondition: a main transformer operation, another main transformer is at hot stand-by duty.

Criterion 1: standby main transformer is uncharged, but there is voltage this main transformer high-pressure side, bus connection switch is in disconnected position, prepared auto restart starts, two sections equal no-voltages of bus of main transformer low-pressure side, its wiper-type contact starts the combined floodgate outlet of standby main transformer high-pressure side, and time-delay contact starts the outlet of standby main transformer low-pressure side combined floodgate, and sends main transformer prepared auto restart actuating signal.

Criterion 2: standby main transformer is uncharged, but there is voltage this main transformer high-pressure side, no external fault locking, the not tripping of former operation main transformer master secondary switch, prepared auto restart starts, and two sections equal no-voltages of bus of main transformer low-pressure side, its wiper-type contact start the combined floodgate outlet of standby main transformer high-pressure side, time-delay contact starts the outlet of standby main transformer low-pressure side combined floodgate, and sends main transformer prepared auto restart actuating signal.

5, female connection prepared auto restart criterion

Precondition: two main transformers division operation.

Criterion: two cover prepared auto restart bulk charges, bus connection switch is in disconnected position, no external fault locking, after the first cover prepared auto restart starting device action, #1 becomes low-pressure side no-voltage, the not tripping of main secondary switch, or after the second cover prepared auto restart starting device action, #2 becomes low-pressure side no-voltage, the not tripping of main secondary switch, then female connection outlet is closed in starting, and sends female connection prepared auto restart signal.

6, interconnection prepared auto restart criterion

Precondition: (1) two main transformer paired running;

(2) two main transformers division operation:

(3) single main transformer operation (not having the maintenance of standby main transformer or another main transformer).

These three kinds of operational modes all can realize the interconnection prepared auto restart.

Criterion: the another set of uncharged but equal no-voltage of main transformer high-pressure side no-voltage or two main transformer high-pressure sides of two cover prepared auto restart bulk charges, a cover charging, these several conditions satisfy then arbitrarily:

Criterion (1): the first cover starting element action, there is not outside block signal, #1 becomes the not tripping of main secondary switch, and the starting interconnection is connected on the combined floodgate outlet that #1 becomes low-pressure side, and sends I section interconnection from voted signal;

Criterion (2): the first cover starting element action, no external fault locking, #1 becomes the not tripping of main secondary switch, and starting #2 becomes the combined floodgate outlet of low-pressure side interconnection, and sends II section interconnection from voted signal;

Criterion (3): the first cover starting element action, bus connection switch are in disconnected position, and starting #2 becomes the combined floodgate outlet of low-pressure side interconnection, and sends II section interconnection from voted signal;

Criterion (4): the second cover starting element action, bus connection switch are in disconnected position, and starting #1 becomes the combined floodgate outlet of low-pressure side interconnection, and sends I section interconnection from voted signal;

Criterion (5): the second cover starting element action, no external fault locking, #2 becomes the not tripping of main secondary switch, and starting #1 becomes the combined floodgate outlet of low-pressure side interconnection, and sends I section interconnection from voted signal;

Criterion (6): the second cover starting element action, no external fault locking, #2 becomes the not tripping of main secondary switch, and starting #2 becomes the combined floodgate outlet of low-pressure side interconnection, and sends II section interconnection from voted signal.

The contact prepared auto restart is two sections bus no-voltages of inspection main transformer low-pressure side when single main transformer moves, and during fanout operation, the corresponding low-pressure side bus no-voltage of starting component action inspection or not voltage during paired running.

7, jump the small power supply criterion

Two main transformer master secondary switches all close position, bus connection switch in disconnected position, a cover prepared auto restart is uncharged, two cover prepared auto restarts are uncharged, have external fault locking, these several conditions to form or behind the door, then:

Criterion (1): I cover prepared auto restart trip component and closing time short time delay are connected, i.e. starting is jumped #1 and become the outlet of low-pressure side small power supply, and sends I section small power supply trip signal.Uncharged as II cover prepared auto restart, also start #2 and become low-pressure side small power supply tripping operation outlet, and send II section small power supply trip signal;

Criterion (2): II cover prepared auto restart trip component and closing time short time delay are connected, i.e. starting is jumped #2 and become low-pressure side small power supply tripping operation outlet, and sends II section small power supply trip signal.Uncharged as I cover prepared auto restart, also start #1 and become low-pressure side small power supply tripping operation outlet, and send I section small power supply trip signal.

8, the overload connection is cut criterion

Two main transformer electric currents and six electric current contacts that interconnection attracts, form or door and main transformer prepared auto restart actuating signal, female connection prepared auto restart actuating signal, interconnection prepared auto restart actuating signal, form or door, the contact recomposition of the contact of electric current and signal and door, the arbitrary electric current contact action and the arbitrary signal contact action all starting the in the back overload time relay.The tripping operation outlet is taken turns in first time limit starting one, and sends the overload connection and jump signal, and the tripping operation outlet is taken turns in second time limit starting two.

9, female connection criterion is jumped in main secondary switch tripping

I cover prepared auto restart is jumped small power supply outlet starting, and #1 becomes main secondary switch and jumps small power supply outlet starting closing position or II cover prepared auto restart, and #2 becomes main secondary switch and closing the position, and these two conditions are arbitrary to be satisfied and promptly jump bus connection switch, sends out the switch tripping simultaneously and jumps female connection signal.

The explanation of relevant loop effect

1, hand is jumped the realization and the involution of locking

Hand is jumped locking and is jumped the relay starting by master's first and second hand of two main transformers, starting when female difference does not have the action of selection, and the bus connection switch tripping when two cover prepared auto restarts all start, also rises and starts to jump locking.After two cover prepared auto restarts are finished the work, start to jump locking by rising total reset time, after hand is jumped block action, two charge circuits are removed self-sustaining.Which overlaps pairing main transformer not at run location, and the charge circuit that is about to prepared auto restart disconnects, and complete atresia should the cover prepared auto restart, have only the pairing main transformer recovery of this cover prepared auto restart to send electricity after, could charge automatically.

2, the realization of external fault locking and involution

The condition that the external fault locking realizes has two:

One: the backup protection by two main transformers is started:

Its two: when double-bus is moved,, after the action of backup protection blocking relay, realize self-sustaining by itself self-sustaining contact by bus protection starting.After prepared auto restart is finished the work, by in the device whole group reset time relay the coil of termination contact short circuit backup protection blocking relay it is returned.When the backup protection locking is returned, must guarantee the involution of the whole group of device, prevent to break away from locking and the false switching that causes.

3, the effect of diverter switch

In 220KV electric substation, the main transformer low-pressure side is double-bus, and which bar bus interconnection and small power supply are connected on, and influence is very big in the work of prepared auto restart.In the action situation of prepared auto restart, I describe in detail.Address this problem, the interlock contact switching with the bus disconnecting link can realize automatic control, as the female difference of microcomputer.But the electric substation that has does not have condition to realize, so install diverter switch and transfer strip on the device additional.By operations staff's manual switchover, on terminal board, added the reservation terminal, can accomplish that auto-manual is optional.

4, the effect of several contacts of control interconnection prepared auto restart start loop power supply

The charge relay of two covering devices is formed and door, has solved main transformer effect of throwing interconnection with the division operation arranged side by side.

I cover charge relay and #2 change high-pressure side no-voltage are formed and door, solve the effect of #1 change operation, #2 change maintenance starting interconnection prepared auto restart.

II cover charge relay and #1 change high-pressure side no-voltage are formed and door, solve the effect of #2 change operation, #1 change maintenance starting interconnection prepared auto restart.

The equal no-voltage in two main transformer high-pressure sides has solved 220KV system high pressure side generation permanent fault, by the problem of contact tape electric substation load.

5, the effect of each contact of small power supply loop is jumped in control

These several contacts are all disconnected when the main transformer paired running, have solved main transformer internal fault both sides switch and have all disconnected the problem of not jumping small power supply.

Two main transformer master secondary closing positions are formed and door, have solved main transformer internal fault when the main transformer paired running, and the problem of small power supply is jumped in main secondary switch tripping.

Bus connection switch has solved the problem of division operation jumping small power supply in disconnected position.

I cover or II cover are uncharged, have solved the problem that single main transformer is jumped small power supply.

The contact of backup protection has solved main transformer paired running generation external fault and has jumped the problem of small power supply under the situation of bus connection switch tripping.

6, jump the effect that small power supply adds time-delay in 0.2 second

Because fault or steal to jump when disconnecting earlier, the prepared auto restart inspection position of the switch and Fast starting are when promptly reflecting the outlet action of prepared auto restart tripping operation and reflect that the position of this side master secondary switch does not disconnect when high side switch.Do not add time-delay in 0.2 second, will jump small power supply in above-mentioned situation prepared auto restart starting back mistake, after jumping small power supply outlet action in 0.2 second, as not tripping of switch, main secondary switch bit is equipped with time enough and returns, and helps judging the switch tripping.’

7, the implementation method of female difference locking

During the double-bus operation, female differential work is formed by the charge relay normal opened contact of two main transformers and is started the external fault blocking element behind the door, the action effect of prepared auto restart is with the main transformer external fault, when single main transformer or two prepared auto restarts all start, rise and start to jump locking, the problem when non-selection tripping operation of female difference and the reliable locking of bus connection switch tripping prepared auto restart has been guaranteed in this measure, has prevented that various prepared auto restart modes from closing a floodgate to the fault point when busbar fault.Before changing property of bus fault, send out closing pulse.After prepared auto restart closed a switch, by the excision once more of mother's difference, prepared auto restart was inoperative, and evolved fault took place before prepared auto restart closes a floodgate, immediately the locking prepared auto restart.

8, the selection of total two periods of involution

First time limit rose and starts to jump locking and make the total locking of device, and the second time limit short circuit external fault blocking relay coil returns it, had prevented too early unlocking and installed and do not have enough time to return the false switching that causes.

9, the time of starting jumping small power supply does not add the effect of maintenance

The self-cleaning contact of the closing time of prepared auto restart was adjusted 0.2 second, and contact is connected the back because the time continues to walk about, and contact promptly disconnects, up to the involution of the whole group of device.I.e. starting is jumped the contact connection of small power supply and is had only the very short time.This has solved following problem: the interconnection that has is normally in running status, in the prepared auto restart starting process, do not make interconnection be in malfunction its excision, and excision is afterwards according to after the prepared auto restart differentiation, can power with this interconnection, it must be closed, be to realize the interconnection prepared auto restart as not only sending out the tripping operation pulse but also sending out closing pulse.

This principle of device

Self adaptation is the most outstanding characteristics of this device, the criterion that it adopts is according to the decision of the operational mode of primary system, especially the main transformer running status that adopts of the charging criterion of prepared auto restart, this lays a good foundation for differentiating various prepared auto restart modes later on, when paired running, apparatus features is two cover prepared auto restart bulk charges, and bus connection switch is closing the position; During fanout operation, two cover prepared auto restart bulk charges, but female switch is in disconnected position; The operation of main transformer, another main transformer stand-by heat then moves the pairing backup auto-activating device of main transformer and charges, and the reflection of the backup auto-activating device of the main transformer correspondence of stand-by heat is that backup auto-activating device is uncharged, but there is voltage the high-pressure side; A main transformer operation, another main transformer maintenance, the prepared auto restart of prepared auto restart reflection maintenance main transformer is uncharged, main transformer high-pressure side no-voltage.

Find out owing to adopt reasonable criterion from above, thereby when having realized the primary system changes of operating modes, prepared auto restart promptly changes it and hauls oneself willingly into mode, this is very favourable to system safety operation.These three kinds of prepared auto restarts are as using hand control, and the one, cut mistake easily, second can only fix wherein a kind of, as carry out female connection prepared auto restart, just do not carry out the interconnection prepared auto restart.

This device advantage:

1, guarantees three decisive criterions of self adaptation prepared auto restart.

2, the interconnection prepared auto restart adopts six criterions, two outlets of closing a floodgate, and the combined floodgate of interconnection is selective, not blindly locking.

3, control is jumped small power supply and is adopted 5 criterions, and 2 tripping operation outlets accomplish that can not jump small power supply does not then jump, and can protect half and just protect half, and worse comes to worst jumps entirely again.

4, jump small power supply and add time-delay in 0.2 second, solved high side switch and stolen jumping or main transformer high-pressure side and go wrong and do not jump the small power supply problem.

5, female connection is jumped in main secondary switch tripping, when having solved electric substation's 66KV side and being unkitted failure protection, the tripping of main secondary switch occurs and has avoided electric substation's full cut-off.

6, main transformer charges under running status, lays a good foundation for realizing self adaptation.

7, the locking of female difference is selective, has promptly prevented electric substation's full cut-off, has also avoided causing prepared auto restart to close a floodgate to the fault point when non-selection fault.

8, the voltage of prepared auto restart is to be subjected to control of main transformer disconnecting link or artificial control, has created condition for realizing self adaptation.

9, two cover prepared auto restarts all start the locking prepared auto restart, and this measure is during to the bus connection switch tripping, and it is the most effective to prevent that the stand-by power supply mistake from closing the fault point.

10, hand is jumped locking releasing earlier, and the backup protection locking is just removed then.

11, jump the outlet loop that closes interconnection and jump small power supply, control the operation characteristic that this meets double-bus through transfer strip.

12, various prepared auto restarts are in that to prevent that bus connection switch tripping and the tripping of main secondary switch from being taked with effective measures, and criterion can obviously be found out from the various prepared auto restarts.

13, externally when fault and the tripping of internal fault master secondary switch, the bus connection switch role is not fully exerted, not random in brief locking.

(4) description of drawings

Fig. 1 is the front layout plan of screen cabinet.

Fig. 2 is the back side layout plan of screen cabinet.

Fig. 3 is current detection circuit figure.

Fig. 4 is signal circuit figure.

Fig. 5 is a prepared auto restart high side voltage loop diagram.

Fig. 6 is prepared auto restart low-pressure side voltage circuit figure.

Fig. 7 is voltage circuit figure.

Fig. 8 is prepared auto restart switching value locked loop figure.

Fig. 9 is prepared auto restart control loop figure.

Figure 10 is that prepared auto restart starts loop diagram.

Figure 11 is prepared auto restart node contact figure.

(5) embodiment

Female connection of adaptive master variable of the present invention and interconnection backup auto-activating device mainly comprise the screen cabinet and are arranged on interior current circuit, signal circuit, voltage circuit, circuit breaker lock loop, start loop and the prepared auto restart control loop of screen cabinet.10 current relay 1-10LJ, 8 voltage relay 1-8YJ, 6 time relay 1-6SJ, 9 block signal relay 1-9XJ, 4 diverter switch 1-4QK, 2 charging indicator light 1-2HD, 36 pressing plate 1-36LP, 12 switching pressing plate 1-12QP are installed in the front of screen cabinet, the back side of screen cabinet is installed 44 little centres of sealing, on screen top 4 three-phase automatic switch 1-4ZK, a single-phase DC automatic switch is installed.Cashier's office in a shop each arrangements of elements is corresponding to the side that is of #1 change for screen, and corresponding to the side that is of #2 change, the wiring of terminal board also is like this.

Current circuit is gathered 10 electric current simulate amounts, is finished by 1-10LJ, and wherein current relay 1LJ, 3LJ reflect 1# main transformer electric current, current relay 2LJ and 4LJ reflection 2# main transformer electric current, the overload of 6 interconnections of current relay 5-10LJ reflection.

Signal circuit is gathered 9 semaphores, and 1-9XJ finishes by signal relay, and wherein, 1XJ is a prepared auto restart unification varying signal; 2XJ is that prepared auto restart closes varying signal No. two; 3XJ is that prepared auto restart closes 1 section interconnection; 4XJ is that prepared auto restart closes II section interconnection; 5XJ is that prepared auto restart is jumped I section small power supply; 6XJ is that prepared auto restart is jumped II section small power supply; 7XJ is that prepared auto restart closes female connection, 8XJ is that prepared auto restart is jumped female connection; 9XJ is that the overload connection is cut signal.The contact that closes with current relay 1LJ control 1YJ, 2YJ, 5YJ, 6YJ, 1ZJ, purpose is when main transformer moves, main transformer has electric current, then the 1LJ normal opened contact is connected, and this moment, then 1-2YJ, 5-6YJ or 1ZJ close point were connected as voltage broken string or direct current broken string, send out signal corresponding, as not adding 1LJ contact control, then when having a power failure, above-mentioned signal long hair.Signal principle with 2LJ control is the same.

Voltage circuit is gathered 8 voltage analogs, is finished by 8 voltage relay 1-8YJ.Wherein, 1-4Yma, 1-4Ymb, 1-4Ymc reflect 220KV mother I, mother II, mother 66KVI, the female voltage of II respectively; 1-4ZK is an automatic switch, controls four busbar voltages respectively, and the 1QK diverter switch is cut the female position of I, 1QHJ action.Then the female voltage of 1-2YJ reflection 220KV I is cut in the female position of II as the 1QK diverter switch, 3QHJ action, the female voltage of 1-2YJ reflection 220KV II.The equal connecting terminal row of each side of 1QK diverter switch, purpose is to select for use disconnecting link to automatically switch as this electric substation's voltage, the interlock contact of disconnecting link can be connected on this position.The contact that closes with 3QHJ is controlled 1QHJ and is controlled 3QHJ with the contact that closes of 1QHJ, and is to prevent in the disconnecting link handoff procedure, 1QHJ, 3QHJ is moved simultaneously cause voltage arranged side by side.

The switching value locked loop, gather five switching values, 1-5ZJ finishes by relay, 1-5ZJ reflects the master first and second of two main transformers and the position of bus connection switch respectively, switch is when closing, the 1-5ZJ excitation, why 3-4ZJ selects two, is because contact is not enough, and relay 1-4YZJ reflects the heavily moving middle of two sections voltages of 220KV and two sections voltages of 66KV respectively, when this section bus no-voltage, i.e. action in the middle of it is heavily moving accordingly is an example with 1YZJ, when 220KVI mother no-voltage, two of 1YJ, 2YJ close contact and all connect, and make the 1YZJ action.1BSJ is that hand is jumped blocking relay, also is the total blocking relay of device, and when master's first and second switch of two main transformers was carried out hand trip(ping), promptly 1STJ, 2STJ or 1STJ`, 2STJ` contact were connected, and made the 1BSJ action.When device is finished the work, make the 1BSJ excitation, promptly whole group re-setting device after connecting by the self-cleaning contact of the whole group of device 6ST reset time.1TJ, 2TJ contact are formed and are started 1BSJ behind the door, and target is when the bus connection switch cabinet is moving, and two cover prepared auto restarts all start, and 1TJ, 2TJ contact are all connected, and the locking prepared auto restart prevents that the prepared auto restart power supply from closing a floodgate to the fault point immediately.MCJ is the contact of bus differential protection, and when busbar fault, this contact is connected.1CDJ ₂, 2CDJ ₂Close the contact that contact is the device charge relay, these two any one connections of contact illustrate that main transformer is single main transformer operation.When single main transformer moves, do not consider selectivity, under such operational mode, busbar fault occurs, immediately the locking prepared auto restart.MCJ passes through 1CDJ ₁, 2CDJ ₁The normal opened contact starting 2BSJ of these two chargers ₁, 2BSJ ₂, target is 1CDJ when two main transformers move ₁, 2CDJ ₁All actions.Busbar fault appears in promptly two main transformers when moving, starting backup protection locking relay 2BSJ ₁, 2BSJ ₂Accomplish optionally locking.2BSJ ₁, 2BSJ ₂Why using two, is because contact is not enough.2BSJ ₁, 2BSJ ₂Starting when being two main transformer backup protection actions.Promptly realize self-sustaining after the action by itself normal opened contact.1QDJ, 2QDJ are respectively the starter relay of two cover prepared auto restarts, and after the device starting, corresponding contact is connected, and make the whole group of device 6SJ reset time action, and the short time delay starting 1BSJ of 6SJ makes the involution of the whole group of device.The long delay short circuit 2BSJ of 6SJ ₁Coil returns it, so that after package unit is deactivated, just removes the backup protection locking, ahead relieving locking when preventing external fault.

Start loop, the criterion that realizes the prepared auto restart charging is: there is voltage the main transformer both sides, main first and second switch is closing the position, and no hand is jumped locking, after the charging, promptly realize self-sustaining by its this normal opened contact, after the device charging, charging indicator light is bright, have only hand to jump block action after, charge relay is returned, and is example with I cover prepared auto restart:

1# becomes main switch and is closing the position, and the 1ZJ contact is connected, and main secondary switch is closing a 3ZJ contact connection, and main transformer both sides disconnecting link closes, and two side bus have voltage, and 1YZJ, 3YZJ close contact and connect, no locking amount, and 1BSJ closes contact and connects, and then starts 1CDJ ₁, 1CDJ ₂1CDJ ₁, 1CDJ ₂By 1CDJ ₁Normal opened contact is realized self-sustaining.

When hand jumping or the involution of the whole group of device,, remove 1CDJ because 1BSJ closes the contact disconnection ₁, 1CDJ ₂Self-sustaining.

The second cover charge circuit implementation method is identical therewith.

This charge circuit is to charge during for running status at main transformer, and adopting pendulum mode to charge with other producer has obvious difference.

The start loop criterion is:

Criterion 1:

No hand is jumped locking, and device charges main transformer no current, main transformer high-pressure side or low-pressure side no-voltage, delayed firing prepared auto restart.

With I cover prepared auto restart start loop is the example explanation:

1BSJ closes contact and connects, 1CDJ ₁Normal opened contact is connected, and 1LJ closes contact and connects, and 1YZJ or 3YZJ normal opened contact are connected, and makes the 1SJ action, and positive electricity closes contact by 1BSJ then, 1CDJ ₁Open contact, 1SJ time-delay contact starting 1TJ.After the 1TJ action, starting 3SJ.The time-delay of 3SJ contact is connected, and makes to start middle 1QDJ action.

Criterion 2:

No hand is jumped locking, and device charges, the main transformer no current, main once or main secondary switch at disconnected position, transient starting prepared auto restart.

With I cover prepared auto restart is the example explanation:

1BSJ closes contact and connects, 1CDJ ₁Open contact and connect, 1LJ closes contact and connects, and 1ZJ or 3ZJ close contact and connect, and promptly start 1TJ.After the 1TJ action, starting 3SJ, 3SJ time-delay contact are connected, and make to start middle 1QDJ action.

II cover prepared auto restart start loop principle is the same

When device whole group involution or hand jumping locking, 1BSJ closes the maintenance that contact has promptly disconnected charge circuit, has also disconnected the startup loop, has solved the problem that the locking amount makes device deactivate immediately to occur.

Work for main transformer, female connection, interconnection prepared auto restart all influences owing to main transformer loses function of supplying power, and therefore, the common activation loop is correct.

Start loop is subjected to charge relay 1CDJ ₁Contact control solved backup auto-activating device only when main transformer move, the phenomenon that main transformer loses function of supplying power occurred, just starts prepared auto restart as the variation of not having the pressure and the position of the switch.This has prevented disorderly starting of prepared auto restart.

The prepared auto restart control loop

(1) main transformer prepared auto restart,

The characteristics that realize the main transformer prepared auto restart are: a main transformer operation, another main transformer stand-by heat.Characteristics for stand-by heat are, the charge relay of corresponding stand-by heat main transformer is uncharged, but because disconnecting link closes, and main once should have voltage, becomes operation with 2#, and the 1# heating is standby to be the example explanation.

Criterion 1:

I cover prepared auto restart is uncharged, and 1# becomes the high-pressure side voltage, the disconnected again position of mother's connection beginning, and prepared auto restart starts, the equal no-voltage of main transformer low-pressure side bus, then transient starting closes the outlet of 1# change high side switch.Delayed startup closes 1# and becomes the low-side switch outlet, and sends prepared auto restart and close the 1# varying signal.

Specific implementation method:

Opening contact with 3YZJ, 4YZJ is linked to be and controls main transformer prepared auto restart positive supply behind the door.

1. 1CDJ ₂Close contact and connect, 1YZJ closes contact and connects, and 5ZJ closes contact and connects, and makes 1HJ action, 1HJ action promptly close 1# after the 4SJ wiper-type contact is connected and becomes high side switch.

2. 1CDJ ₂Close contact and connect, 1YZJ closes contact and connects, and 5ZJ closes contact and connects, and 2QDJ opens contact and connects, and by 1XJ starting 3HJ, promptly closes 1# after the 3HJ action and becomes low-side switch.1XJ action back is sent out prepared auto restart and is closed the 1# varying signal.

Criterion 2

The I cover is thrown uncharged fully, and there is voltage the high-pressure side, no external fault locking, and 2# becomes the not tripping of main secondary switch, and the then instantaneous 1# that closes becomes high side switch after the prepared auto restart starting, and low-side switch is closed in time-delay.

Specific implementation method:

1. 1CDJ ₂Close contact and connect, 1YZJ closes contact and connects, 2BSJ ₂Close contact, 4ZJ ₂Close contact, after the 4SJ normal opened contact is connected, make the 1HJ action.

2. positive electricity passes through 1CDJ ₂Close contact, 1YZJ ₂Close contact, 2BSJ ₂Close contact, 4ZJ ₂Close contact, 2QDJ opens contact and starts 3HJ by 1XJ.

When two main transformers move, 1CDJ ₂Close contact and disconnect, when 1# became maintenance, 1YZJ closed contact and disconnects, and makes main transformer prepared auto restart control loop lose positive supply, and these two contacts are the decisive criterions that realize the main transformer prepared auto restart.

The operating principle that the 1# change moves, the 2# heating is standby is the same.

(2) female connection prepared auto restart

The characteristics of carrying out female connection prepared auto restart primary system are: two main fanout operations.

Criterion: two cover prepared auto restart bulk charges, bus connection switch is in disconnected position, no external fault locking, when the starting of I cover prepared auto restart, the 1# step-down is pressed side bus no-voltage, the not tripping of main secondary switch, and when the starting of II cover prepared auto restart, the 2# step-down is pressed side bus no-voltage, the not tripping of main secondary switch, then the female connection of starting prepared auto restart closes a floodgate and exports, and sends female connection prepared auto restart switching signal.

Specific implementation method:

1, positive electricity passes through 1CDJ ₁, 2CDJ ₂Open contact, 5ZJ closes contact, 2BSJ ₁Close contact, 1QDJ opens contact, 3ZJ ₂Close contact, 7XJ and make the 7HJ action.

2, positive electricity passes through 1CDJ ₁, 2CDJ ₂, 5ZJ closes contact, 2BSJ ₁Close contact, 2QDJ opens contact, 4ZJ ₂Close contact, 7XJ signal and make the 7HJ action.

When single main transformer moves, 1CDJ ₁, 2CDJ ₁Two contacts can not be connected simultaneously, and during the main transformer paired running, 5ZJ closes contact and should disconnect, so these three contacts are the decisive criterions that realize female connection prepared auto restart.

(3) interconnection prepared auto restart

The characteristics of practicable interconnection prepared auto restart primary system:

Two main transformer paired runnings, two main transformer fanout operations, single main transformer operation (a main transformer operation, another main transformer maintenance) primary system decompression.

At the control loop of carrying out the interconnection prepared auto restart, four contact controls positive supply, i.e. 1CDJ are arranged ₁, 2CDJ ₁, 1YZJ, 2YZJ.

1CDJ ₁, 2CDJ ₁Form and door the arranged side by side and apportion (can cancel) of reflection as not allowing the electromagnetism networking;

1CDJ ₁, 2YZJ forms and door, reflection 1# becomes operation, 2# becomes maintenance;

1YZJ, 2CDJ ₁Form and door, reflection 2# becomes operation, and 1# becomes maintenance;

1YZJ, 2YZJ form and door, reflection primary system decompression.

These four contacts are decisive criterions of carrying out the interconnection prepared auto restart.These four contacts have also determined can not realize the interconnection prepared auto restart when realizing the main transformer prepared auto restart.

After possessing the condition that realizes the interconnection prepared auto restart, then: open contact with 3YZJ, 4YZJ and control single main transformer operation, realize interconnection prepared auto restart positive supply, two main transformer operations, 1CDJ ₁, 2CDJ ₁Positive supply control with cross-line, 1QZJ action is controlled by 3YZJ, the 3YZJ contact also meets 5UP, the 2QDJ action is subjected to 4YZJ control, 4YZJ contact and meets 8LP, 5LP, 8LP connect when paired running.

Criterion 1:

The starting of I cover prepared auto restart, no external fault locking, 1# becomes the not tripping of main secondary switch, and the outlet of I section interconnection is closed in starting, and sends and close I section order wire signal.

Concrete enforcement: the 1QDJ action, this contact is connected, and passes through 2BSJ ₂Close contact 3ZJ ₂Close and connect, 3XJ starts 5HJ.

Criterion 2:

The starting of I cover prepared auto restart, no external fault locking, 1# becomes the not tripping of main secondary switch, and the outlet of II section interconnection is closed in starting, and sends and close II section order wire signal.

Concrete enforcement: the 1QDJ action, this contact is connected, and passes through 2BSJ ₂Close contact, 3ZJ ₂Close contact, 4XJ starts 6HJ.

Criterion 3:

The first cover starting element action, bus connection switch in disconnected position, starting 2# becomes the combined floodgate outlet of low-pressure side interconnection, and sends II section interconnection from voted signal.

Concrete enforcement: the 1QDJ action, close contact by 5ZJ, 4XJ starts 6HJ.

Criterion 4:

The second cover starting element action, bus connection switch are in disconnected position, and starting 1# becomes the combined floodgate outlet of low-pressure side interconnection, and sends one section interconnection from voted signal.

Concrete enforcement: the 2QDJ action, close contact by 5ZJ, 3XJ starts 5HJ.

Criterion 5:

The second cover starting element action, no external fault, 2# become the not tripping of main secondary switch, and starting 1# becomes the combined floodgate outlet of low-pressure side interconnection, and sends I section interconnection from voted signal.

Concrete enforcement: the 2QDJ action, pass through 2BSJ ₂, 4ZJ ₂, 3XJ starts 5HJ.

Criterion 6:

The second cover starting element action, no external fault locking, 2# becomes the not tripping of main secondary switch, and starting 2# becomes the combined floodgate outlet of low-pressure side interconnection, and sends II section interconnection from voted signal.

Concrete enforcement: the 2QDJ action, pass through 2BSJ ₂, 4ZJ ₂, 4XJ starts 6HJ.

The interconnection prepared auto restart has been selected six criterions for use with two outlets of closing a floodgate, and has guaranteed the selectivity of interconnection prepared auto restart.

(4) jump small power supply

3ZJ ₁, 4ZJ ₁Contact is formed and door.During the main transformer paired running, internal fault takes place, the tripping of main secondary switch, then 3ZJ ₁Or 4ZJ ₁Contact does not return, and has connected the positive supply of jumping small power supply.

5ZJ connects when fanout operation, guarantees fanout operation jumping small power supply.

1CDJ ₂, 2CDJ ₂A connection when moving, single main transformer is arranged.

2BSJ ₁Externally connect during fault, when guaranteeing two main transformer paired runnings, external fault takes place jump small power supply.

These several contacts are in paired running generation internal fault, and main transformer both sides switch all disconnects or switch is stolen reasons such as jumping, and contact is all disconnected, and disconnected the positive supply of jumping small power supply, do not jump small power supply.

1CDJ ₂With 2CDJ ₂Close that contact is formed or door, cross-over connection is jumped between two groups of starting roads of small power supply, has solved the problem that the small power supply non-selectivity is jumped in single main transformer operation, during because of single main transformer operation, and 1CDJ ₂Or 2CDJ ₂A connection must be arranged.

Jump small power supply criterion 1:

I cover prepared auto restart trip component and closing time short time delay are connected, i.e. starting is jumped 1# and become the outlet of low-pressure side small power supply, and sends I section small power supply trip signal, and is uncharged as II cover prepared auto restart, also start 2# and become low-pressure side small power supply tripping operation outlet, and send 2 sections small power supply trip signals.

Concrete enforcement: the 1TJ action, through the 3SJ self-cleaning contact, 5XJ starts 3TJ ₁, 3TJ ₂Or the 1TJ action, through 3SJ self-cleaning contact, 2CDJ ₂, 6XJ starts 4TJ ₁, 4TJ ₂

Jump small power supply criterion 2

II cover prepared auto restart trip component and closing time short time delay are connected, i.e. starting is jumped 2# and become low-pressure side small power supply tripping operation outlet, and sends II section small power supply trip signal, and is uncharged as I cover prepared auto restart, also start 1# and become low-pressure side small power supply tripping operation outlet, and send I section small power supply trip signal.

Concrete enforcement: 2TJ moves through the 4SJ self-cleaning contact.6XJ starts 4TJ ₁, 4TJ ₂Or the 2TJ action is through 4SJ self-cleaning contact, 1CDJ ₂, 5X starts 3TJ ₁, 3TJ ₂

(5) the overload connection is cut

Two main transformer electric currents and six electric current contact composition or doors that interconnection attracts, haul oneself willingly into the magnetic retaining contact of actuating signal, female connection prepared auto restart actuating signal, interconnection prepared auto restart actuating signal forms or door with main transformer, the contact recomposition of the contact of electric current and signal and door, any one signal contact action all starting overload time relay of any one electric current contact action and back, the tripping operation outlet is taken turns in first time limit starting one, and send the overload connection and cut signal, the tripping operation outlet is taken turns in second time limit starting two.

Concrete enforcement: the parallel connection of 5-10LJ contact, in parallel with the 7XJ contact again after the parallel connection of 1-4XJ contact, electric current contact is connected in series back starting 5SJ with signal contact then, the 5SJ self-cleaning contact starts 5TJ, 5SJ by 9XJ and stops contact starting 6TJ.

(6) female connection is jumped in main secondary switch tripping

The action of I cover prepared auto restart jumping small power supply outlet signal wiper-type contact, 1# becomes main secondary switch in the wiper-type contact action of closing position or II cover prepared auto restart jumping small power supply outlet signal, and 2# becomes main secondary switch and is closing the position, this

Two conditions are arbitrary to be satisfied and promptly jumps bus connection switch, sends out the switch tripping simultaneously and jumps female connection signal.

Claims

1, adaptive master variable, female connection and interconnection backup auto-activating device, comprise the screen cabinet and be arranged on interior current detection circuit and the control circuit of screen cabinet, control circuit comprises voltage detecting loop, circuit breaker lock loop, start loop and prepared auto restart control loop, it is characterized in that:

A, described current detection circuit, constitute by ten loops at most, a current analog amount is gathered in each loop, wherein, two analog quantitys are used for two main transformers and detect the locking of nothing stream, also have two analog quantitys to be used to reflect two main transformer overloads, other analog quantity is used to reflect six overloads of following interconnection after hauling oneself willingly into;

B, described voltage detecting loop, constitute by eight loops, a voltage analog is gathered in each loop, the voltage of per two voltage analog quantitative response main transformer high and low pressure sides, and eight voltage analogs are not all directly taken from busbar voltage, and must be after the main transformer disconnecting link closes, with the busbar voltage of main transformer knife switch secondary contact control;

C, described switching value locked loop are gathered five switching values, i.e. main transformer first and second switch and bus connection switch, select two locked loops for use, be that hand is jumped locking, external fault locking, it is the total locking of device that hand is jumped locking, the lockable part prepared auto restart of external fault locking;

D, described prepared auto restart control loop comprise main transformer prepared auto restart control loop, female connection prepared auto restart control loop, interconnection prepared auto restart control loop;

E, described start loop, adopt two cover loops, the analog quantity that the first cover loop reflection #1 becomes and the variable quantity of switch, analog quantity and switch change amount that the second cover loop reflection #2 becomes, this two covers start loop all works to different prepared auto restarts, the realization of three kinds of prepared auto restarts can realize its corresponding function automatically with the primary system changes of operating modes in the control loop, and when adapting to main secondary and bus connection switch tripping to the influence of prepared auto restart;

2, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device is characterized in that disposing in the described control loop jumping small power supply loop.

3, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device is characterized in that disposing in the described control loop overload connection switchback road.

4, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device is characterized in that disposing in the described control loop main secondary switch tripping and jump female connection loop.

5, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device is characterized in that disposing in the described control loop a plurality of signal circuits.

6, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device is characterized in that disposing in the described control loop and are used for the loop that telemechanical apparatus is controlled four road voltages and control direct current broken string, prepared auto restart initiating signal;

7, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device, it is characterized in that described current circuit, gather 10 electric current simulate amounts, finish by 1-10LJ, wherein current relay 1LJ, 3LJ reflect 1# main transformer electric current, current relay 2LJ and 4LJ reflection 2# main transformer electric current, the overload of 6 interconnections of current relay 5-10LJ reflection.

8, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device, it is characterized in that described voltage circuit, finish by 8 voltage relay 1-8YJ, wherein, 1-4Yma, 1-4Ymb, 1-4Ymc reflect 220KV mother I, mother II, 66KV mother I, the female voltage of II respectively; 1-4ZK is an automatic switch, controls four busbar voltages respectively, and the 1QK diverter switch is cut the female position of I, 1QHJ action.Then the female voltage of 1-2YJ reflection 220KV I is cut in the female position of II as the 1QK diverter switch, 3QHJ action, the female voltage of 1-2YJ reflection 220KV II.The equal connecting terminal row of each side of 1QK diverter switch.

9, adaptive master variable according to claim 1, female connection and interconnection backup auto-activating device, it is characterized in that described switching value locked loop, gather five switching values, 1-5ZJ finishes by relay, and 1-5ZJ reflects the master first and second of two main transformers and the position of bus connection switch respectively, and switch is when closing, the 1-5ZJ excitation, relay 1-4YZJ reflects the heavily moving middle of two sections voltages of 220KV and two sections voltages of 66KV respectively, when this section bus no-voltage, and i.e. action in the middle of it is heavily moving accordingly.

10, adaptive master variable, female connection and interconnection prepared auto restart implementation method is characterized in that:

1, hauls oneself willingly into function

Hand trip(ping), prepared auto restart is inoperative.

2, charge circuit criterion

3, start loop criterion and course of action

3.7 two cover start loops are all identical.

4, main transformer prepared auto restart criterion

Criterion 1: standby main transformer is uncharged, but there is voltage this main transformer high-pressure side, and bus connection switch is in disconnected position, prepared auto restart starts, its wiper-type contact starts the combined floodgate outlet of standby main transformer high-pressure side, and time-delay contact starts the outlet of standby main transformer low-pressure side combined floodgate, and sends main transformer prepared auto restart actuating signal.

Criterion 2: standby main transformer is uncharged, but there is voltage this main transformer high-pressure side, no external fault locking, the not tripping of former operation main transformer master secondary switch, prepared auto restart starts, its wiper-type contact starts the combined floodgate outlet of standby main transformer high-pressure side, and time-delay contact starts the outlet of standby main transformer low-pressure side combined floodgate, and sends main transformer prepared auto restart actuating signal.

5, female connection prepared auto restart criterion

Precondition: two main transformers division operation.

Criterion: two cover prepared auto restart bulk charges, bus connection switch is in disconnected position, no external fault locking, after the first cover prepared auto restart starting device action, #1 becomes the not tripping of main secondary switch, or after the second cover prepared auto restart starting device action, #2 becomes the not tripping of main secondary switch, then female connection outlet is closed in starting, and sends female connection prepared auto restart signal.

6, interconnection prepared auto restart criterion

Precondition: (1) two main transformer paired running;

(2) two main transformers division operation:

7, jump the small power supply criterion

8, the overload connection is cut criterion

9, female connection criterion is jumped in main secondary switch tripping

The explanation of relevant loop effect

1, hand is jumped the realization and the involution of locking

2, the realization of external fault locking and involution

The condition that the external fault locking realizes has two:

One: the backup protection by two main transformers is started:

3, the effect of diverter switch

5, the effect of each contact of small power supply loop is jumped in control

6, jump the effect that small power supply adds time-delay in 0.2 second

7, the implementation method of female difference locking

8, the selection of total two periods of involution