CN204835514U - Rebound way is prevented in cooperation suitable for dual operation case - Google Patents

Abstract

The utility model provides a rebound way is prevented in cooperation suitable for dual operation case. Its tripping operation that includes combined floodgate control switch KK, a cover trip protection export contact BCJ, the protection of B cover exports contact BCJ', prevents jumping relay coil TBIJ, normally closed contact DL, trip coil TC, wherein: the tripping operation export contact BCJ' of combined floodgate control switch KK, a cover trip protection export contact BCJ and the protection of B cover is parallelly connected back each other, more in proper order with prevent jumping relay coil TBIJ, NO -contact DL and trip coil TC series connection. The utility model provides a rebound way is prevented in cooperation suitable for dual operation case has solved the circuit breaker body does not have the rebound of preventing way to the matching problem. That prevents the rebound way during configuration dual operation case makes when the protection device who is chooseed for use the control box of preventing the rebound way to correspond withdraws from the operation, or this protection device trouble is during action export signal, and the electric protection device that continues prevents that it can normally exert to jump the function.

Description

A coordinated anti-jump circuit suitable for double operation boxes

technical field

The utility model belongs to the technical field of power transmission and transformation protection, in particular to a matching anti-jump circuit suitable for double operation boxes.

Background technique

In the work of the power system, it is very important to prevent the switch from jumping, and the anti-jump circuit has always been the focus of the annual inspection and acceptance of the relay protection department. The specific function of the anti-jump circuit is to prevent the circuit breaker from closing on the faulty line due to the failure of the manual closing control switch or the automatic reclosing contact to return, resulting in repeated tripping of the circuit breaker with short-circuit fault current. . If the circuit breaker jumps many times, it will cause the breaking capacity of the circuit breaker to decrease, and even cause an explosion accident.

The anti-jump circuit of the commonly used double operation box is shown in Figure 1. Under normal circumstances, the control switch KK (marked as 1 in the figure, the same below) or the automatic reclosing switch ZJ (2) returns after closing, if this When there is a fault in the line, the relay protection device operates, the contact BCJ (3) is closed, the trip circuit (T) is connected, and the circuit breaker trips.

And when the closing control switch KK (1) or the automatic reclosing switch ZJ (2) does not return when closing, the closing circuit (H) is charged all the time. At the same time, if there is a fault in the line, the relay protection device will act. In the trip circuit (T), the contact BCJ is closed (3), and the trip circuit (T) is connected to trip the circuit breaker. At the same time, the trip current also activates the anti-trip relay TBIJ (4). In the closing circuit (H), its normally open contact TBJ1 (5) is connected, and the relay TBUJ (6) is self-maintained, and at the same time, the normally closed contact TBJ2 (7) is disconnected from the closing circuit (H). Because of the self-holding function of the relay TBUJ (6), the closing circuit (H) can be cut off and will not be closed again, thereby realizing the anti-jumping function.

At present, the 220kV line protection of some 220kV substations has begun to be transformed. The original two sets of 220kV line protection equipment in the station have been upgraded, and the original operation box has been replaced. During the transformation process, only the protection device was replaced, and the old-fashioned circuit breaker of the corresponding line was not replaced, and the operation box of the protection device was changed from the original common set to a double set of operation boxes. Although this transformation method saved power outage time and transformation costs, it also left a series of problems in the coordination of the anti-jump circuit of the double-set operation box.

Since the original single-operation box has been changed into a double-operation box after the transformation of the protective device, there should be only one closing circuit (H) according to the relevant regulations of the company. If there are two sets of protection, A and B, when using set A to protect the closing circuit (H) in the operation box, then use set A to protect the anti-jump circuit (F) in the operation box. The closing circuit (H) of set B protection is not used, that is, although the BCJ' outlet of set B protection operates and the TBIJ in the trip circuit (T) starts, but the TBJ relay of the closing circuit is not connected to the circuit, so the operation box of set B corresponds to The anti-jump circuit (F) is also invalid.

In this wiring situation, if the A set of protection stops running or the A set of protection refuses to operate when the line fails, even if the B set of protection BCJ' exit operates at this time, because it does not have the anti-jump function, the circuit breaker will still jump.

Contents of the invention

In order to solve the above problems, the purpose of this utility model is to provide a matching anti-jump circuit suitable for double operation boxes.

In order to achieve the above purpose, the matching anti-jump circuit suitable for double operation boxes provided by the utility model includes: closing control switch KK, A set of protection trip outlet contact BCJ, B set of protection trip outlet contact BCJ', anti-jump relay coil TBIJ, normally closed contact DL, trip coil TC; among them: closing control switch KK, A set of protection trip outlet contact BCJ and B set of protection trip outlet contact BCJ' are connected in parallel with each other, and then sequentially connected with the anti-jump relay coil TBIJ, normal The open contact DL and the trip coil TC are connected in series.

The matching anti-jump circuit suitable for double operation boxes provided by the utility model solves the problem of cooperation of the anti-jump circuit when the circuit breaker body has no anti-jump circuit and is equipped with dual operation boxes. When the protection device is out of operation, or when the protection device fails and there is no action exit signal, the anti-jump function of the relay protection device can function normally.

Description of drawings

Fig. 1 is the anti-jump circuit wiring diagram of double operation box in the prior art;

Fig. 2 is the wiring diagram of the matching anti-jump circuit applicable to the double operation box provided by the utility model;

Figure 3 is a logical block diagram of the cooperation between the double operation box and the single anti-jump circuit;

Detailed ways

The matching anti-jump circuit suitable for double operation boxes provided by the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The matching anti-jump circuit suitable for double operation boxes provided by the utility model is to connect the signal of the tripping outlet contact BCJ' (8) of the B set to the tripping circuit (T) of the A set of protection operation box, that is, the tripping outlet contact of the B set of protection BCJ'(8) is connected in parallel with the trip outlet contact BCJ(3) of set A protection; in this way, when set A protection quits operation or line fault occurs, set A protection refuses to move, and set B protection exit acts. TBIJ (4) starts in the protective trip circuit (T) of set A, and in the protective closing circuit (H) of set A, its normally open contact TBJ1 (5) is connected, and the normally closed contact TBJ2 (7) is disconnected. And the TBUJ (6) is self-maintaining, thereby successfully realizing the anti-jump function.

As shown in Figure 2, the anti-trip circuit suitable for the double operation box with the anti-trip circuit includes: closing control switch KK (1), A set of protection trip outlet contact BCJ (3), B set of protection trip Exit contact BCJ'(8), anti-jump relay coil TBIJ(4), normally closed contact DL(9), trip coil TC(10); among them: closing control switch KK(1), A set of protection trip export contact BCJ (3) After being connected in parallel with the trip outlet contact BCJ'(8) of the B set of protection, it is connected in series with the anti-jump relay coil TBIJ(4), the normally open contact DL(9) and the trip coil TC(10) in sequence.

The working principle of the anti-jump circuit: connect the BCJ' signal of the B set protection to the trip circuit (T) of the A set protection operation box, when the A set protection stops running or the line fails, the A set protection refuses to move, and the B set protection exits action. TBIJ (4) starts in the protective trip circuit (T) of set A, and in the protective closing circuit (H) of set A, its normally open contact TBJ1 (5) is connected, and the normally closed contact TBJ2 (7) is disconnected. And the TBUJ (6) is self-maintaining, thereby successfully realizing the anti-jump function. Its principle is shown in Figure 3.

According to the above logic block diagram, we can determine the wiring situation, and introduce the hard wiring of the action outlet BCJ' of the B set of protection in the operation box of the A set of protection, thereby increasing the communication anti-jump circuit of the B set of protection. For the trip circuit (T) of the double protection, the two sets of protection action outlets are in the relationship of "or", so the outlet action signal of the B set of protection is connected to the A protection trip circuit (T) in parallel, which is very important for the relay protection. Action trip conditions have no effect.

Claims (1)

1. be applicable to a cooperation anti-jump loop for dual operation case, it is characterized in that: the described cooperation anti-jump loop being applicable to dual operation case comprises: the trip outlet contact BCJ ' of shutting-brake control K switch K, A cover trip protection outlet junctions BCJ, B cover protection, anti-trip relay coil TBIJ, normally closed contact DL, breaking coil TC; Wherein: shutting-brake control K switch K, A overlap the trip outlet contact BCJ ' of trip protection outlet junctions BCJ and B cover protection parallel with one another after, then to be connected in series with anti-trip relay coil TBIJ, normal opened contact DL and breaking coil TC successively.