CN218242996U - Improved circuit for closing loop of generator outlet circuit breaker - Google Patents

Abstract

The embodiment of the application provides an improved circuit for generator outlet circuit breaker combined floodgate return circuit, includes: the GCB control cabinet comprises a GCB control cabinet and a plug-in box, wherein the plug-in box comprises a double-position relay FJ, a closing relay HJ and an opening relay TJ. And the closing relay HJ and the opening relay TJ are respectively connected with the double-position relay FJ in parallel, and an auxiliary node of the closing relay HJ is connected with a closing loop in the GCB control cabinet. The embodiment of the application cancels the operation box and changes the operation box into the plug-in box. And a switching-on instruction is sent to the plug-in box, a double-position relay and a switching-on relay in the plug-in box are started, an auxiliary node of the switching-on relay is sent to a GCB switching-on loop to realize GCB switching-on, and a node after the double-position relay is switched on is used for a GCB equipment accident total signal loop to realize GCB equipment accident total signal uploading.

Description

Improved circuit for closing loop of generator outlet circuit breaker

Technical Field

The application relates to the technical field of electrical control, in particular to an improved circuit for a closing loop of a generator outlet circuit breaker.

Background

At present, a plurality of domestic large-scale thermal power generating units, particularly nuclear power generating units and hydraulic units, protect generators and transformers by arranging generator outlet circuit breakers (GCBs). However, manufacturers in China have no capability of producing GCB matched with large-capacity units, and only a few foreign manufacturers have the capability of producing GCB. In 5.1.2 and 4 of DLT5136-2012 ' technical specification of secondary wiring design of thermal power plant and transformer substation ' 5.1.2, an electrical locking device for preventing ' jumping ' of a circuit breaker is suitable for using an anti-jumping loop in a circuit breaker mechanism ', at the moment, attention needs to be paid to the matching problem of an anti-jumping relay in a mechanism and a monitoring module of a closing loop in a circuit breaker control cabinet at the outlet of a generator and an in-operation box positioning monitoring relay.

The high-temperature gas cooled reactor demonstration engineering generator outlet circuit breaker adopts a GCB control cabinet complete set of equipment of Switzerland ABB manufacturers, an operation box adopts Nanrui CZX-12S of Nanjing, and two problems occur in the matching: firstly, when the GCB is switched on, switching-on is carried out again, and the GCB cannot realize normal operation function; secondly, the accident total signal uploading of the GCB equipment cannot be realized.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an improved circuit for a generator outlet circuit breaker closing circuit, which is used for solving the problem that GCB can not be repeatedly switched on and switched off and realizing the uploading of accident total signals of GCB equipment. The technical scheme is as follows:

the embodiment of the application provides an improved circuit for generator outlet circuit breaker combined floodgate return circuit, includes: the GCB control cabinet comprises a GCB control cabinet and a plug-in box, wherein the plug-in box comprises a double-position relay FJ, a closing relay HJ and an opening relay TJ, and the closing relay HJ and the opening relay TJ are respectively connected with the double-position relay FJ in parallel; and the auxiliary node of the closing relay HJ is connected with a closing loop in the GCB control cabinet.

Optionally, after a closing instruction is received, the dual-position relay FJ and the closing relay HJ are electrified, and a normally open node of the dual-position relay FJ and a normally open node of the closing relay HJ are closed.

Optionally, during a period that the normally open node of the closing relay HJ is closed and the GCB is closed, the anti-tripping relay K1 in the GCB control cabinet is electrified.

Optionally, when a normally open node of the closing relay HJ is disconnected, the anti-tripping relay K1 in the GCB control cabinet loses power, and a normally closed node of the K1 connected in series in the closing loop is closed.

Optionally, when a protection trip instruction occurs and the GCB is switched off, the total accident signal is sent from the two-position relay FJ to the S0 normally-closed node, and the total GCB accident signal is correctly sent.

The beneficial effects of the above technical scheme of this application are:

the embodiment of this application provides an improve circuit for generator exit circuit breaker combined floodgate return circuit, includes: the GCB control cabinet comprises a GCB control cabinet and a plug-in box, wherein the plug-in box comprises a double-position relay FJ, a closing relay HJ and an opening relay TJ. And the closing relay HJ and the opening relay TJ are respectively connected with the double-position relay FJ in parallel, and an auxiliary node of the closing relay HJ is connected with a closing loop in the GCB control cabinet. The embodiment of the application aims at the problems that the existing GCB is switched on and then switched off, the high-temperature gas cooled reactor cannot be switched on again and the GCB equipment accident total signal uploading cannot be realized. And a switching-on instruction is sent to the plug-in box, a double-position relay and a switching-on relay in the plug-in box are started, an auxiliary node of the switching-on relay is sent to a GCB switching-on loop to realize GCB switching-on, and a node after the double-position relay is switched on is used for a GCB equipment accident total signal loop to realize GCB equipment accident total signal uploading.

Drawings

FIG. 1 is a schematic diagram of a GCB closing circuit in the prior art;

FIG. 2 is a schematic diagram of a total accident signal circuit in the prior art;

FIG. 3 is a schematic diagram of a GCB closing circuit in the embodiment of the present application;

fig. 4 is a schematic diagram of a total accident signal loop in the embodiment of the present application.

In the drawings:

TWJ: position-separated monitoring relay

SHJ: hand-operated relay

STJ: hand trip relay

KKJ: double-position relay

REM: remote control

LOC: in situ control

Q81 point: generator side ground knife brake

Q82 is divided into: main transformer side earthing switch

Q9 in combination: closing switch of isolating switch

Q9 is as follows: disconnecting switch opening

HJ: closing relay

TJ: opening relay

FJ: double-position relay

Detailed Description

To make the technical problems, technical solutions and advantages to be solved by the present application clearer, the following detailed description is made with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the embodiments of the present application be fully understood. Accordingly, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present application, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

In the GCB closing circuit (closing circuit for short) in the prior art, an open position monitoring relay (TWJ) and an anti-tripping relay K1 are unreasonably matched to cause a parasitic circuit, so that after GCB closing and opening, closing faults can not occur, and meanwhile, accident total signals are generated in a wrong mode. Referring to fig. 1, the applicant analyzed the specific cause of the problem as follows:

when a closing instruction is received, the 1SHJ and the KKJ are electrified, the 1SHJ normally-open node is closed, and the KKJ normally-open node is closed. And meanwhile, corresponding normally open nodes in the GCB control cabinet are controlled to be closed, and corresponding circuit loops are as follows: the power supply is positive → 1SHJ normally open node → SHJ (manual relay) → Q81 division → Q82 division → Q9 combination → K1 normally closed node (tripping relay K1 loses power, the node is closed) → S0 normally closed node (GCB is in a dividing position, the node is closed) → K2 (spring pressure is normal, the node is closed) → K3 (SF 6 pressure is normal, the node is closed) → S0 normally closed node (GCB is in a dividing position, the node is closed) → closing coil → REM of S2 (S2 is in a far position, the circuit is selected) → power supply is negative, so that the closing coil is electrified, and GCB closing is realized.

After the GCB is switched on, the S0 normally-open node is closed, and the S0 normally-closed node is opened. The corresponding circuit loops at this time are: positive power supply → TWJ (relay for monitor in partial position) → Q81 division → Q82 division → Q9 combination → S0 normally open node → K1 anti-skip relay → negative power supply.

Because the position-dividing monitoring relay TWJ and the anti-tripping relay K1 are both voltage type relays, the internal resistances of the two relays are matched to determine the voltage distribution when the two relays are connected in series. Because the high-temperature gas cooled reactor is unreasonable in matching, the position-division monitoring relay TWJ and the anti-tripping relay K1 are electrified simultaneously, and the auxiliary node is changed in position, namely the K1 normally-open node is closed, the K1 normally-closed node is opened, and the TWJ normally-open node is closed.

The accident total signal loop comprises a KKJ normally-open node → a TWJ normally-open node, namely the accident total signal is sent out wrongly (the accident total signal is not sent out at the moment, the accident total signal is correctly sent out, namely the accident total signal is correctly uploaded only when a protection tripping command exists after GCB is switched on).

Further, after receiving a manual opening command (called a manual opening command for short), the GCB opens the gate. After the GCB is switched off, the S0 normally-open node is disconnected, and the S0 normally-closed node is closed. The corresponding circuit loops at this time are: the power supply positive → TWJ (separating position monitoring relay) → Q81 division → Q82 division → Q9 combination → K1 normally open node → anti-jump relay K1 → power supply negative, namely the anti-jump relay K1 is still electrified at the moment, so that the K1 normally closed node connected in series in a closing loop is disconnected, and at the moment, a GCB closing instruction exists, and the GCB cannot be closed any more.

In view of the above, the embodiment of the present application provides an improved circuit for a closing loop of a generator outlet circuit breaker, which is changed into a plug-in box instead of an operation box, that is, a tap monitoring relay TWJ, a closing instruction self-holding relay, and the like are removed in the prior art. The plug-in box comprises a double-position relay FJ, a closing relay HJ and an opening relay TJ, wherein the closing relay HJ and the opening relay TJ are respectively connected with the double-position relay FJ in parallel, and an auxiliary node of the closing relay HJ is connected with a closing loop in a GCB control cabinet.

In the embodiment of the invention, the closing relay HJ and the opening relay TJ are both high-power relays. In fig. 3, a loop including the closing relay HJ above the double-position relay FJ is a starting loop, and a loop including the opening relay TJ below the double-position relay FJ is a resetting loop.

In the practical application process of the application, after a closing instruction is received, the double-position relay FJ and the closing relay HJ are electrified, and a normally open node of the double-position relay FJ and a normally open node of the closing relay HJ are closed. And simultaneously controlling the corresponding normally open node in the GCB closing loop to close, wherein the obtained circuit loop is as follows: the power supply is positive → REM of S2 (S2 is far away, the circuit is selected) → Q81 is divided → Q82 is divided → Q9 is combined → K1 normally closed node (the tripping relay K1 loses power, the node is closed) → S0 normally closed node (GCB is in a dividing position, the node is closed) → K2 (the spring pressure is normal, the node is closed) → K3 (SF 6 pressure is normal, the node is closed) → S0 normally closed node (GCB is in a dividing position, the node is closed) → closing coil → REM of S2 (S2 is far away, the circuit is selected) → power supply is negative, closing coil is electrified, and GCB is closed.

During the period that the normally open node of the closing relay HJ is closed and the GCB is closed, the corresponding circuit loop is as follows: the power supply plus → REM of S2 (S2 is in a far place, the loop is selected) → Q81 fen → Q82 fen → Q9 HE → S0 normally open node → anti-tripping relay K1 → power supply minus, namely, the anti-tripping relay K1 is electrified, if a protection tripping instruction exists at the moment, the GCB cannot be switched on again after the GCB is tripped, and the anti-tripping relay K1 is electrified to prevent the GCB from adhering to a switching instruction and have the phenomenon of switching on and switching off to and fro when the protection tripping instruction exists.

When a normally open node of the closing relay HJ is disconnected, the anti-tripping relay K1 in the GCB control cabinet loses power, the K1 normally closed node connected in series in a closing loop is closed, and at the moment, a GCB closing instruction exists, the GCB is closed again, so that the problem that the GCB cannot be closed again after closing and opening of the existing high-temperature gas cooled reactor is effectively solved.

If a protection tripping instruction occurs, after the GCB is switched off, the accident total signal loop is conducted by the FJ normally open node → the S0 normally closed node, and the GCB accident total signal alarm is correctly sent out.

The utility model provides an improve circuit that is used for generator outlet circuit breaker combined floodgate return circuit, include: the GCB control cabinet comprises a GCB control cabinet and a plug-in box, wherein the plug-in box comprises a double-position relay FJ, a closing relay HJ and an opening relay TJ. And the closing relay HJ and the opening relay TJ are respectively connected with the double-position relay FJ in parallel, and an auxiliary node of the closing relay HJ is connected with a closing loop in the GCB control cabinet. The embodiment of the application aims at the problem that the GCB can not be switched on after switching on and switching off in the high-temperature gas cooled reactor, an operation box is cancelled, namely a switching-off monitoring relay TWJ, a switching-on instruction self-holding relay and the like are cancelled, and a plug-in box is changed. And a closing instruction is sent to the plug-in box, a double-position relay FJ and a closing relay HJ in the plug-in box are started, an auxiliary node of the closing relay HJ is sent to a GCB closing loop to realize GCB closing, and a closed node of the double-position relay is used for a GCB equipment accident total signal loop to realize GCB equipment accident total signal uploading. The embodiment of the application realizes the repeated switching-on and switching-off function in the normal operation of the GCB; the accurate alarm of the total accident signal of the GCB equipment is realized. In addition, the embodiment of the application keeps the principle that the loop in the GCB control cabinet at the inlet is not repaired, and prevents the parasitic loop of the GCB closing loop from being generated.

The foregoing is a preferred embodiment of the present application and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle described in the present application and should be considered as the scope of protection of the present application.

Claims (1)

1. An improved circuit for a generator outlet circuit breaker closing circuit, comprising: the GCB control cabinet comprises a GCB control cabinet and a plug-in box, wherein the plug-in box comprises a double-position relay FJ, a closing relay HJ and an opening relay TJ, and the closing relay HJ and the opening relay TJ are respectively connected with the double-position relay FJ in parallel; and the auxiliary node of the closing relay HJ is connected with a closing loop in the GCB control cabinet.

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