CN107919243A - A kind of improved structure and control method in disconnecting switch electric blocking circuit - Google Patents

Abstract

The invention relates to an improved structure and control method of an electric blocking circuit of a disconnector. One end of the positive female isolating switch 1G is connected to the AC 220V main operating power supply, the other end of the positive female isolating switch 1G is connected to the common end of the circuit breaker DL through the line side grounding isolating switch 3GD1 of the circuit breaker, and the normally open contact DL of the circuit breaker DL ‑2 Connect to the control circuit of the main mother isolating switch and the auxiliary mother isolating switch control circuit through the parallel circuit of the main mother isolating switch 1G and the auxiliary mother isolating switch 2G. The normally closed contact DL‑1 of the circuit breaker DL is connected to one end of the line grounding isolating switch 3GD2, the other end of the line grounding isolating switch 3GD2 is connected to the control circuit of the line isolating switch, and the normally closed contact DL‑1 of the circuit breaker DL is connected to the positive The control circuit of the parent isolating switch is connected with the control circuit of the auxiliary mother isolating switch. The invention not only realizes the locking requirement of the isolating switch, but also effectively reduces the layout of auxiliary nodes and cables, simplifies the secondary circuit, reduces the workload of operation and maintenance, saves engineering materials, and reduces costs.

Description

An improved structure and control method of an electrical blocking circuit of an isolating switch

technical field

The invention relates to an electrical locking circuit of a disconnector, in particular to an improved structure and a control method of the electrical locking circuit of a disconnector which reduces cable laying and simplifies a secondary circuit.

Background technique

The 220kV substation undertakes the main power supply task in the local power grid, and there are many equipments in the substation, which put forward higher requirements for the correct operation of the operators. Therefore, no matter from the perspective of safe operation of power grid equipment or the personal safety of operators, it is an important content of substation design to design and improve equipment anti-misoperation locking measures. At present, most of the isolating switches in 220kV substations are electrically operated. Therefore, designing and installing a reliable electrical anti-misoperation locking circuit can effectively avoid the misoperation of the isolating switch.

At present, the common isolating switch locking circuits are mostly independent, that is, each isolating switch adopts an independent locking circuit, and the locking circuits are connected in series in their respective control circuits. Although this connection method can achieve the basic requirements of preventing false locking, However, there are the following disadvantages: more auxiliary contacts are required, cables need to be laid separately, and cable consumption is relatively large; the number of loops is large and complicated, which increases the difficulty of daily operation and maintenance.

Contents of the invention

In order to solve the above technical problems, the present invention provides an improved structure and control method of the electrical locking circuit of the disconnector, which can effectively reduce the amount of cable laying and the usage of auxiliary nodes, simplify the secondary circuit, and reduce the workload of daily operation and maintenance. Save engineering materials and reduce costs.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: an improved structure of a disconnector electrical locking circuit of the present invention, comprising a circuit breaker DL, a positive mother isolating switch 1G, an auxiliary mother isolating switch 2G, a circuit breaker The grounding isolation switch 1GD on the busbar side and the grounding isolation switch 3GD1 on the line side of the circuit breaker. One end of the positive bus isolation switch 1G is connected to the AC 220V main operating power supply. The common terminal A of the circuit breaker DL is connected, and the normally open contact DL-2 of the circuit breaker DL is connected to the control circuit of the main mother isolating switch and the auxiliary mother isolating switch through the parallel circuit of the main mother isolating switch 1G and the auxiliary mother isolating switch 2G.

As a preference, the improved structure of the isolating switch electrical locking circuit includes a line isolating switch 3G and a line grounding isolating switch 3GD2, the normally closed contact DL-1 of the circuit breaker DL is connected to one end of the line grounding isolating switch 3GD2, and the line grounding isolating The other end of the switch 3GD2 is connected to the control loop of the line isolating switch, and the normally closed contact DL-1 of the circuit breaker DL is connected to the control loop of the positive and secondary isolating switches.

As a preference, in the 220KV line interval primary system with 220KV double busbar wiring, one end of the circuit breaker DL is connected to the 220KV main busbar through the main bus isolating switch 1G, and the other is connected to the 220KV auxiliary busbar through the auxiliary bus isolating switch 2G. One path is grounded through the grounding isolating switch 1GD on the bus side of the circuit breaker, the other end of the circuit breaker DL is connected to the power line through the line isolating switch 3G, and the other path is grounded through the grounding isolating switch 3GD1 on the line side of the circuit breaker, and the line isolating switch 3G and The connection end of the power line is then grounded through the line grounding isolation switch 3GD2.

As a preference, the main bus isolating switch 1G, auxiliary bus isolating switch 2G and line isolating switch 3G are all electric operation mode switches, and the circuit breaker bus side grounding isolating switch 1GD, circuit breaker line side grounding isolating switch 3GD1 and Line grounding disconnector 3GD2 is a manual operation mode switch.

According to the control method of the improved structure of the isolating switch electrical locking circuit of the present invention, for the positive and female isolating switch 1G, when one of the following two conditions is met, the unlocking operation can be performed:

1) The grounding isolation switch 1GD on the busbar side of the circuit breaker, the grounding isolation switch 3GD1 on the line side of the circuit breaker and the normally closed contact DL-1 of the circuit breaker DL are all in position;

2) The ground isolating switch 1GD on the bus side of the circuit breaker and the grounding isolating switch 3GD1 on the line side of the circuit breaker are in the off position, the normally open contact DL-2 of the circuit breaker DL is in the close position, and the auxiliary bus isolating switch 2G is in the close position;

For the auxiliary mother isolating switch 2G, when one of the following two conditions is met, the unlocking operation can be performed:

1) The grounding isolation switch 1GD on the busbar side of the circuit breaker, the grounding isolation switch 3GD1 on the line side of the circuit breaker and the normally closed contact DL-1 of the circuit breaker DL are all in position;

2) The grounding isolation switch 1GD on the busbar side of the circuit breaker and the grounding isolation switch 3GD1 on the line side of the circuit breaker are in the off position, the normally open contact DL-2 of the circuit breaker DL is in the closing position, and the positive mother isolating switch 1G is in the closing position.

As a preference, the control method of the improved structure of the isolating switch electrical locking circuit includes: for the line isolating switch 3G, when the circuit breaker bus side grounding isolating switch 1GD, circuit breaker line side grounding isolating switch 3GD1, line grounding isolating switch 3GD2 And when the normally closed contact DL-1 of the circuit breaker DL is in the sub-position, the control circuit of the line isolation switch can be connected.

The beneficial effects of the present invention are: through the improvement of the electrical locking circuit of the isolating switch, not only the locking requirements of the isolating switch can be realized, but also the layout of auxiliary nodes and cables can be effectively reduced, the secondary circuit can be simplified, and the workload of daily operation and maintenance can be reduced. , save engineering materials and reduce costs.

Description of drawings

Fig. 1 is a schematic diagram of a connection structure of the present invention.

Fig. 2 is a system diagram of the 220KV line interval of the 220KV double bus connection in the present invention.

In the figure 1. AC 220V total operating power supply, 2. Main bus isolating switch control circuit, 3. Auxiliary bus isolating switch control circuit, 4. Line isolating switch control circuit, 5.220KV main busbar, 6.220KV auxiliary busbar, 7. Power consumption line.

Detailed ways

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment: The improved structure of the electrical locking circuit of a disconnector in this embodiment, in the 220KV line interval primary system with 220KV double busbar wiring, as shown in Figure 2, includes circuit breaker DL, positive mother isolating switch 1G, auxiliary busbar Isolating switch 2G, line isolating switch 3G, circuit breaker bus side grounding isolating switch 1GD, circuit breaker line side grounding isolating switch 3GD1 and line grounding isolating switch 3GD2, one end of circuit breaker DL, one way passes through the main bus isolating switch 1G and 220KV main bus 5 is connected, the other is connected to the 220KV auxiliary bus 6 through the auxiliary bus isolating switch 2G, and the other is grounded through the grounding isolating switch 1GD on the bus side of the circuit breaker, and the other end of the circuit breaker DL is connected to the line isolating switch 3G and the power line 7 The other road is grounded through the grounding isolation switch 3GD1 on the line side of the circuit breaker, and the connection end of the line isolation switch 3G and the power line 7 is grounded through the line grounding isolation switch 3GD2. The main bus isolating switch 1G, auxiliary bus isolating switch 2G and line isolating switch 3G are all electric operation mode switches, the circuit breaker bus side grounding isolating switch 1GD, circuit breaker line side grounding isolating switch 3GD1 and line grounding isolating switch 3GD2 are all manually operated mode switch.

The improved structure of the electrical locking circuit of the isolating switch in this embodiment, as shown in Figure 1, one end of the main female isolating switch 1G is connected to the AC 220V total operating power supply 1, and the other end of the positive female isolating switch 1G is grounded and isolated through the circuit breaker line side The switch 3GD1 is connected to the common terminal A of the circuit breaker DL, and the normally open contact DL-2 of the circuit breaker DL passes through the parallel circuit of the main mother isolating switch 1G and the auxiliary mother isolating switch 2G, the main mother isolating switch control circuit 2 and the auxiliary mother isolating switch The control loop 3 is connected. The normally closed contact DL-1 of the circuit breaker DL is connected to one end of the line grounding isolating switch 3GD2, the other end of the line grounding isolating switch 3GD2 is connected to the control circuit 4 of the line isolating switch, and the normally closed contact DL-1 of the circuit breaker DL is connected to It is connected with the control circuit 2 of the isolating switch of the positive mother and the control circuit 3 of the isolating switch of the auxiliary mother.

The control method of the improved structure of the above-mentioned isolating switch electrical blocking circuit is as follows:

For the main and female isolating switch 1G, when one of the following two conditions is met, the unlocking operation can be performed:

1) The grounding isolation switch 1GD on the busbar side of the circuit breaker, the grounding isolation switch 3GD1 on the line side of the circuit breaker and the normally closed contact DL-1 of the circuit breaker DL are all in position;

2) The grounding isolation switch 1GD on the bus side of the circuit breaker and the grounding isolation switch 3GD1 on the line side of the circuit breaker are in the off position, the normally open contact DL-2 of the circuit breaker DL is in the closing position, and the auxiliary bus isolating switch 2G is in the closing position.

For the auxiliary mother isolating switch 2G, when one of the following two conditions is met, the unlocking operation can be performed:

1) The grounding isolation switch 1GD on the busbar side of the circuit breaker, the grounding isolation switch 3GD1 on the line side of the circuit breaker and the normally closed contact DL-1 of the circuit breaker DL are all in position;

2) The grounding isolation switch 1GD on the busbar side of the circuit breaker and the grounding isolation switch 3GD1 on the line side of the circuit breaker are in the off position, the normally open contact DL-2 of the circuit breaker DL is in the closing position, and the positive mother isolating switch 1G is in the closing position.

For the line isolating switch 3G, when the grounding isolating switch 1GD on the busbar side of the circuit breaker, the grounding isolating switch 3GD1 on the line side of the circuit breaker, the 3GD2 on the line grounding isolating switch and the normally closed contact DL-1 of the circuit breaker DL are all in position, the The line isolation switch control loop 4 can be connected.

In the locking requirements, the circuit breaker cannot be regarded as an obvious disconnection point. Therefore, the electric operation locking requirements for the main mother isolating switch 1G, the auxiliary mother isolating switch 2G, and the line isolating switch 3G are as follows:

1) Close the circuit breaker DL, and electrically lock the main mother isolating switch 1G, the auxiliary mother isolating switch 2G and the line isolating switch 3G.

2) The 1G isolating switch of the main mother is closed, and the 2G operation of the isolating switch of the auxiliary mother can be opened without judging the position of the circuit breaker DL.

3) When the 2G isolating switch of the auxiliary mother is closed, the main mother isolating switch 1G can be opened for operation without judging the position of the circuit breaker DL.

4) Close grounding isolation switch 3GD1 on the line side of the circuit breaker, and electrically lock the main mother isolation switch 1G, auxiliary mother isolation switch 2G and line isolation switch 3G.

5) Close the line ground isolation switch 3GD2, and block the line isolation switch 3G.

6) The grounding isolation switch 1GD on the bus side of the circuit breaker is closed, and the main bus isolation switch 1G, the auxiliary bus isolation switch 2G and the line isolation switch 3G are electrically locked.

This embodiment can meet the on-site electrical locking requirements of the isolating switch. The required number of cable cores is 19 cores, and the number of auxiliary nodes used is 7. However, the required number of cable cores for the traditional isolating switch electrical locking circuit is 30 cores. , the number of auxiliary nodes used is 12.

After adopting the invention, not only can the isolation switch be locked, but also can effectively reduce the layout of auxiliary nodes and cables, simplify the secondary circuit, reduce the workload of daily operation and maintenance, save engineering materials and reduce costs.

Claims (6)

1. An improved structure of the electrical locking circuit of a disconnector, characterized in that it comprises a circuit breaker DL, a positive mother disconnector 1G, a secondary mother disconnector 2G, a circuit breaker bus side ground disconnector 1GD and a circuit breaker line side ground disconnector 3GD1 , one end of the positive female isolating switch 1G is connected to the AC 220V main operating power supply (1), the other end of the positive female isolating switch 1G is connected to the common terminal A of the circuit breaker DL through the circuit breaker line side grounding isolating switch 3GD1, and the circuit breaker DL The normally open contact DL-2 is connected to the control circuit (2) of the main mother isolating switch and the control circuit (3) of the main mother isolating switch and the auxiliary mother isolating switch (3) through the parallel circuit of the main mother isolating switch 1G and the auxiliary mother isolating switch 2G. 2. The improved structure of a disconnector electrical locking circuit according to claim 1, characterized in that it comprises a line disconnector 3G and a circuit ground disconnector 3GD2, the normally closed contact DL-1 of the circuit breaker DL and the circuit ground isolation One end of the switch 3GD2 is connected, the other end of the line grounding isolation switch 3GD2 is connected with the line isolation switch control circuit (4), and the normally closed contact DL-1 of the circuit breaker DL is in turn connected with the positive female isolation switch control circuit (2) It is connected with the auxiliary mother isolating switch control circuit (3). 3. The improved structure of a kind of isolating switch electrical blocking circuit according to claim 2, characterized in that in the 220KV line interval primary system of 220KV double busbar wiring, one end of the circuit breaker DL passes through the positive bus isolating switch 1G and The 220KV main busbar (5) is connected, the other is connected to the 220KV auxiliary busbar (6) through the auxiliary bus isolating switch 2G, and the other is grounded through the grounding isolating switch 1GD on the bus side of the circuit breaker, and the other end of the circuit breaker DL is isolated through the line Switch 3G is connected with power line (7), and another road is grounded through circuit breaker line side grounding isolating switch 3GD1, and the connecting end of line isolating switch 3G and power line (7) is grounded through line grounding isolating switch 3GD2. 4. According to claim 2 or 3, the improved structure of the electrical blocking circuit of a disconnector is characterized in that the main disconnector 1G, the auxiliary disconnector 2G and the line disconnector 3G are all electric operation mode switches , the grounding isolation switch 1GD on the busbar side of the circuit breaker, the grounding isolation switch 3GD1 on the line side of the circuit breaker and the grounding isolation switch 3GD2 on the line side are all manual operation mode switches. 5. A control method for an improved structure of an isolating switch electrical locking circuit, characterized in that for the positive mother isolating switch 1G, when one of the following two conditions is met, the unlocking operation can be performed: 1) The grounding isolation switch 1GD on the busbar side of the circuit breaker, the grounding isolation switch 3GD1 on the line side of the circuit breaker and the normally closed contact DL-1 of the circuit breaker DL are all in position; 2) The ground isolating switch 1GD on the bus side of the circuit breaker and the grounding isolating switch 3GD1 on the line side of the circuit breaker are in the off position, the normally open contact DL-2 of the circuit breaker DL is in the close position, and the auxiliary bus isolating switch 2G is in the close position; For the auxiliary mother isolating switch 2G, when one of the following two conditions is met, the unlocking operation can be performed: 1) The grounding isolation switch 1GD on the busbar side of the circuit breaker, the grounding isolation switch 3GD1 on the line side of the circuit breaker and the normally closed contact DL-1 of the circuit breaker DL are all in position; 2) The grounding isolation switch 1GD on the busbar side of the circuit breaker and the grounding isolation switch 3GD1 on the line side of the circuit breaker are in the off position, the normally open contact DL-2 of the circuit breaker DL is in the closing position, and the positive mother isolating switch 1G is in the closing position. 6. The control method of the improved structure of a kind of isolating switch electric blocking circuit according to claim 5, characterized in that the improved structure of the isolating switch electric blocking circuit comprises line isolating switch 3G and line grounding isolating switch 3GD2, circuit breaker DL The normally closed contact DL-1 is connected to one end of the line grounding isolating switch 3GD2, the other end of the line grounding isolating switch 3GD2 is connected to the control circuit (4) of the line isolating switch, and the normally closed contact DL-1 of the circuit breaker DL is connected to the circuit breaker DL. The control loop (2) of the isolating switch of the main busbar and the control loop (3) of the isolating switch of the auxiliary busbar are connected; the control method of the improved structure of the electrical locking circuit of the isolating switch includes: Switch 1GD, circuit breaker line side grounding isolating switch 3GD1, line grounding isolating switch 3GD2 and normally closed contact DL-1 of circuit breaker DL are all in position, the line isolating switch control circuit (4) can be connected.