CN218216671U - Circuit breaker control circuit and circuit breaker anti-tripping module - Google Patents

Abstract

The utility model provides a circuit breaker control circuit and a circuit breaker anti-jump module, belonging to the technical field of high-voltage electrical appliances. The circuit breaker anti-jumping module includes a current type relay and two voltage type relays; after the coil of the current type relay is connected in series with the first normally closed contact of the first voltage type relay, they are connected in series in the closing circuit of the circuit breaker; the current The coil of the type relay, the first normally closed contact of the first voltage type relay, the circuit breaker contact and the branch circuit formed by the closing coil are used as the first branch; the normally open contact of the current type relay and the second voltage type relay The coil is connected in series with the first branch; the normally open contact of the second voltage type relay is connected in parallel with the normally open contact of the current type relay; the normally closed contact of the current type relay is connected in series with the coil of the first voltage type relay The coils of the second voltage type relay are connected in parallel. The circuit breaker anti-jump module uses a current-type relay to start the anti-jump relay, which effectively solves the problem of failure of the anti-jump circuit to start.

Description

Circuit breaker control circuit and circuit breaker anti-trip module

technical field

The utility model relates to a circuit breaker control circuit and a circuit breaker anti-jump module, belonging to the technical field of high-voltage electrical appliances.

Background technique

High-voltage circuit breakers play a pivotal role in the operation of the entire power grid. They can effectively cut off faults such as grounding and phase-to-phase short circuits, and ensure safe and reliable operation of lines. During the closing operation of the circuit breaker, if the line is in a fault state, the protection will issue an opening command, and the circuit breaker will perform the opening operation. After closing, because the closing circuit command still exists or the closing exit circuit is still charged due to adhesion, the relay will perform the closing operation again. Due to the closing fault, the protection opening command is still there, and the circuit breaker will perform the opening operation again. The switching time of the auxiliary switch contacts of the circuit breaker mechanism is shown in Figure 1, and the opening and closing time of the auxiliary switch of the circuit breaker mechanism is 56-60ms. The repeated opening and closing action of the circuit breaker is called "jumping" of the circuit breaker, which will cause the circuit breaker to burn or explode due to continuous breaking of short-circuit current in a short period of time, causing the accident to expand.

In order to avoid the above problems, an anti-jump circuit is currently designed in the control circuit of the circuit breaker. The schematic diagram of the existing anti-jump circuit is shown in Figure 4. A single voltage type relay is used as the anti-jump relay KV, and the anti-jump relay KV and The normally open auxiliary contacts 41 and 43 of the circuit breaker QF1 cooperate to form an anti-jump circuit. In the on state, the normally open auxiliary contacts 41 and 43 of the circuit breaker QF1 are closed at this time. If the closing and opening transition time of the normally open auxiliary contacts 41 and 43 of QF1 is greater than the pull-in time of the anti-jump relay KV, the anti-jump relay is successfully started , so that the coil of the anti-jump relay KV is electrified, and then the normally open auxiliary contacts 13 and 14 of the anti-jump relay KV are closed, and the coil of the anti-jump relay KV forms a self-holding circuit, while the normally closed auxiliary contact 21 of the anti-jump relay KV, 22 is disconnected, the closing circuit of the circuit breaker is disconnected, and the anti-jumping circuit plays a role. At this time, even if the protection device opens the remote circuit breaker before the closing command is released, since the anti-trip relay has been activated and the closing command has not been released, the coil of the anti-trip relay KV will always be charged, thereby preventing The normally closed auxiliary contacts 21 and 22 of the tripping relay KV will always disconnect the closing circuit of the circuit breaker, and the circuit breaker will not close again after it is opened, thereby preventing the phenomenon of "jumping" of the circuit breaker.

However, since the anti-jump relay KV uses a voltage-type relay, compared with the current-type relay, the start-up pulse required by the voltage-type relay is larger and the required start-up time is longer. As shown in Figure 2, the parameters of the voltage-type relay 1 The pull-in time under the given rated voltage is no more than 50ms, but due to the dispersion of the actual pull-in time of the anti-jump relay, the time may be deviated, so that the product’s own anti-jump circuit may work in a critical state, making the Circuit breaker operation is in an unsafe state. If the on-off switching time of the normally open auxiliary contacts 41, 43 of the circuit breaker QF1 is less than the pull-in time of the anti-jump relay KV, the anti-jump relay cannot be activated, and the anti-jump circuit will fail, unable to play the role of preventing the circuit breaker from "jumping". effect. Therefore, the key to starting the existing anti-jump circuit is that the on-off switching time of the normally open auxiliary contacts 41, 43 of the circuit breaker QF1 is greater than the pull-in time of the anti-jump relay KV. Although the pull-in time of the voltage-type relay can be made as short as possible through device selection, as shown in Figure 3, the pull-in time at the rated voltage given in the parameter 1 of the voltage-type relay is not greater than 20ms, although the parameters meet Circuit breaker anti-jump circuit design requirements, but limited by the operating conditions of the power grid, the actual pickup time of the anti-trip relay is scattered, and the time may be deviated. If the closing time of the auxiliary contacts 41 and 43 is less than the pull-in time of the anti-jump relay KV, there is a risk of failure of the anti-jump circuit; in addition, a line fault may also cause the normally open auxiliary contacts 41 and 43 of the circuit breaker QF1 to close The time is short, and the circuit breaker QF1 opens again when the anti-jump relay KV has not been activated. At this time, the circuit breaker will close because the circuit breaker closing command has not been released, and then the circuit breaker will open again because the fault still exists. , During this period, the anti-jump relay KV does not start, and the anti-jump circuit does not work, and the circuit breaker will still "jump", causing serious power failures.

In addition, there is currently a jump monitoring circuit in the circuit breaker control circuit. As shown in Figure 1, the existing circuit breaker jump monitoring circuit needs to be connected in series with the normally closed auxiliary contacts 74 and 76 of the circuit breaker QF1 to realize. When the on-off switching time of the normally open auxiliary contacts 41, 43 of the circuit breaker QF1 is less than the pull-in time of the anti-jump relay KV, the circuit breaker has actually been closed, and the normally closed auxiliary contacts 31, 32 of the anti-trip relay KV are still closed. If it does not operate, the original monitoring closing circuit becomes a monitoring anti-jumping circuit, resulting in the opening indicating device not operating and showing the opening state, which will mislead the circuit breaker background monitoring system and cause hidden dangers in power operation.

To sum up, the existing circuit breaker control circuit has the following problems: (1) The start-up of the existing circuit breaker anti-jump circuit depends on the cooperation of the switching time of the auxiliary contact of the circuit breaker and the pull-in time of the anti-jump relay. When the on-off switching time of the auxiliary contact of the circuit breaker is less than the pull-in time of the anti-jump relay, the anti-jump relay cannot be started, resulting in the failure of the anti-jump circuit; Points, more wiring, higher error-prone rate.

Utility model content

The purpose of the utility model is to provide a circuit breaker control circuit and a circuit breaker anti-jump module, which can effectively solve the problem of failure of the existing anti-jump circuit.

In order to achieve the above object, the utility model provides a circuit breaker control circuit, including a circuit breaker anti-jump module and a circuit breaker closing circuit, the circuit breaker closing circuit includes a closing switch, a circuit breaker contact and closing coil, the circuit breaker anti-jumping module includes a current type relay and two voltage type relays; wherein,

After the coil of the current-type relay is connected in series with the first normally closed contact of the first voltage-type relay, they are connected in series in the closing circuit of the circuit breaker; the coil of the current-type relay and the first voltage-type relay The branch formed by the first normally closed contact, the circuit breaker contact and the closing coil is used as the first branch;

After the normally open contact of the current type relay is connected in series with the coil of the second voltage type relay, it is connected in parallel with the first branch;

The normally open contact of the second voltage type relay is connected in parallel with the normally open contact of the current type relay;

The normally closed contact of the current type relay is connected in parallel with the coil of the second voltage type relay after being connected in series with the coil of the first voltage type relay.

The beneficial effect of the circuit breaker control circuit is: the circuit breaker anti-jumping module of the circuit breaker control circuit adopts the close cooperation of the voltage type and the current type relay, and the current type relay is connected in series in the circuit breaker closing circuit as the starting relay, and the action time Short, can respond quickly to start; the first voltage type relay is used as an anti-jump relay, and the second voltage type relay is used as a self-holding relay, wherein, when the current type relay is energized, the self-holding relay starts quickly, and then the current type relay is de-energized, The anti-jump relay starts quickly, and the circuit breaker anti-jump module plays a role in protecting the circuit breaker; that is, the circuit breaker anti-jump module uses a current-type relay to start the anti-jump relay, replacing the original circuit breaker auxiliary contact to start, so that the anti-jump relay The start of the circuit breaker is not limited by the action time of the auxiliary contact of the circuit breaker. It overcomes the problem that the anti-jump relay cannot be started due to the insufficient closing and opening time of the auxiliary contact of the circuit breaker, thus effectively solving the problem of the failure of the anti-jump circuit to start, and can avoid power failure. The occurrence of accidents improves the reliability level of power supply; moreover, the electrical wiring is simple, the action is reliable, the control circuit of the circuit breaker is optimized, and the stability of the circuit breaker operation is significantly improved.

Further, in the above circuit breaker control circuit, the circuit breaker anti-jumping module further includes two diodes, and the two diodes are connected in parallel with the coil of the current source relay after being connected in series.

The beneficial effect of this is that the voltage on both sides of the current-mode relay can be stabilized by using the two diodes, thereby stabilizing the working current of the current-mode relay.

Further, in the above circuit breaker control circuit, the first voltage type relay also includes a second normally closed contact, and the second normally closed contact of the first voltage type relay is used to be connected in series in the circuit breaker trip monitoring circuit middle.

The beneficial effect of this is: by connecting the normally closed contact of the anti-jump relay (that is, the first voltage type relay) in series in the jump monitoring circuit, the jump monitoring function is realized, so that the jump monitoring circuit does not need the auxiliary contact of the circuit breaker. points, can reduce electrical connections and improve circuit breaker control reliability.

The utility model also provides a relay anti-jump module, the circuit breaker anti-jump module includes a current type relay and two voltage type relays; wherein,

After the coil of the current type relay is connected in series with the first normally closed contact of the first voltage type relay, it is used to be connected in series in the closing circuit of the circuit breaker; the closing circuit of the circuit breaker includes closing switches connected in series sequentially , the circuit breaker contact and the closing coil, the branch formed by the coil of the current type relay, the first normally closed contact of the first voltage type relay, the circuit breaker contact and the closing coil as the first branch;

The normally open contact of the current type relay is connected in parallel with the first branch after being connected in series with the coil of the second voltage type relay;

The normally open contact of the second voltage type relay is connected in parallel with the normally open contact of the current type relay;

The normally closed contact of the current type relay is connected in parallel with the coil of the second voltage type relay after being connected in series with the coil of the first voltage type relay.

The beneficial effect of the relay anti-jumping module is: the current type relay is used as the starting relay, the first voltage type relay is used as the anti-jumping relay, and the second voltage type relay is used as the self-holding relay, wherein, when the current type relay is energized, the self-holding The relay starts quickly, and then the current-type relay is powered off, the anti-jump relay starts quickly, and the circuit breaker anti-jump module plays a role in protecting the circuit breaker; the relay anti-jump module uses a current-type relay to start the anti-jump relay (that is, the first voltage type relay), Replace the start of the original auxiliary contact of the circuit breaker, so that the start of the anti-jump relay is not limited by the operation time of the auxiliary contact of the circuit breaker, and overcome the problem that the anti-jump relay cannot be started due to insufficient closing and opening time of the auxiliary contact of the circuit breaker, thus It effectively solves the problem of start-up failure of the anti-jump circuit, avoids the occurrence of electric accidents, and improves the reliability level of power supply; moreover, the electrical wiring is simple, the action is reliable, the control circuit of the circuit breaker is optimized, and the stability of the operation of the circuit breaker is significantly improved.

Further, in the above circuit breaker anti-trip module, the circuit breaker anti-trip module further includes two diodes, and the two diodes are connected in parallel with the coil of the current-mode relay after being connected in series.

The beneficial effect of this is that the voltage on both sides of the current-mode relay can be stabilized by using the two diodes, thereby stabilizing the working current of the current-mode relay.

Further, in the above-mentioned circuit breaker anti-jumping module, the first voltage type relay also includes a second normally closed contact, and the second normally closed contact of the first voltage type relay is used for serial connection in the circuit breaker trip monitoring in the loop.

The beneficial effect of this is: by connecting the normally closed contact of the anti-jump relay (that is, the first voltage type relay) in series in the jump monitoring circuit, the jump monitoring function is realized, so that the jump monitoring circuit does not need the auxiliary contact of the circuit breaker. points, can reduce electrical connections and improve circuit breaker control reliability.

Description of drawings

Figure 1 is a schematic diagram of the switching time of the auxiliary switch contact of the circuit breaker mechanism;

Fig. 2 is a schematic diagram of the first pull-in time of the existing anti-jump relay;

Fig. 3 is a schematic diagram of the second pull-in time of the existing anti-jump relay;

Fig. 4 is a schematic diagram of a circuit breaker control circuit in the prior art;

Fig. 5 is a schematic diagram of the circuit breaker control circuit in the circuit breaker control circuit embodiment of the utility model.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Example of circuit breaker control loop:

As shown in Figure 5, the circuit breaker control circuit of the present embodiment includes a circuit breaker anti-jump module and a circuit breaker closing circuit, wherein the circuit breaker closing circuit comprises closing switches connected in series in sequence (as shown in Figure 5, closing The brake switch includes a close-controlled closing switch and a remote-controlled closing switch. In actual work, according to who issues the closing order, it is determined whether the closing switch here is a close-controlled closing switch or a remote-controlled closing switch), circuit breaker contacts ( Including the normally closed contacts 54, 56 of the circuit breaker QF1 and the normally closed contacts 66, 68 of the circuit breaker QF1) and the closing coil YC1.

The anti-jumping module of the circuit breaker in this embodiment includes a current type relay and two voltage type relays. In the following, KA represents the current type relay, KV represents the first voltage type relay, and KV1 represents the second voltage type relay.

It can be seen from Figure 5 that the coils A1-A2 of KA are connected in series with the first normally closed contacts 21 and 22 of KV and then connected in series in the circuit breaker closing circuit. In this embodiment, the coils of KA and the first normally closed contacts of KV are connected in series. The series connection position of the points is between the closing switch and the circuit breaker contact. As other implementations, the series connection position can be adjusted according to actual needs. For example, the series connection position can also be between the circuit breaker contact and the closing coil.

For the sake of simplification, the branch composed of the coils A1-A2 of KA, the first normally closed contacts 21, 22 of KV, the circuit breaker contacts and the closing coil YC1 is taken as the first branch; the normally open contact 13 of KA , 14 is connected in series with the coil A1-A2 of KV1 and then connected in parallel with the first branch; the normally open contacts 13 and 14 of KV1 are connected in parallel with the normally open contacts 13 and 14 of KA; the normally closed contacts 21 and 22 of KA are connected with KV After the coils A1-A2 of KV1 are connected in series, they are connected in parallel with the coils A1-A2 of KV1.

The working principle of the circuit breaker anti-jump module of this embodiment is as follows:

(1) After the closing switch is turned on, before the circuit breaker QF1 is not closed:

The closing circuit of the circuit breaker is in the conduction state, the coil A1-A2 of the current type relay KA is energized, and then the normally open contacts 13 and 14 of KA are closed, and the normally closed contacts 21 and 22 of KA are disconnected, so that the second voltage type The coils A1-A2 of the relay KV1 are energized, and then the normally open contacts 13 and 14 of the KV1 are closed, and the coil of the KV1 is self-maintained.

At this time, the coil of the current type relay KA is energized, so that the coil of the first voltage type relay KV is in a ready state.

(2) When the circuit breaker QF1 is closed:

The normally closed contacts 54 and 56 of the circuit breaker QF1 are disconnected, causing the circuit breaker closing circuit to be de-energized, the coil of the current relay KA loses power, the normally open contacts 13 and 14 of KA are disconnected, and the normally closed contacts 21, 22 is closed, because the closing command has not been released at this time, the closing switch is still connected, the coil of KV1 is self-maintaining, so that the normally open contacts 13 and 14 of KV1 are still in the closed state, and the normally closed contacts 21 and 22 of KA are still in the closed state. Closed, so that the coil of the first voltage relay KV is electrified, the first voltage relay KV works, the normally closed contacts 21 and 22 of KV are disconnected, and the closing circuit of the circuit breaker is disconnected.

If the line fault protection device remotely opens the circuit breaker before the closing command is released, then 54 and 56 of the circuit breaker QF1 are closed again. If there is no anti-jump device, the circuit breaker closing circuit will be in the In the conduction state, the circuit breaker will open and close repeatedly, but with the circuit breaker anti-jump module of this embodiment, the circuit breaker will not close again after opening, because before the closing command is released, the circuit breaker of this embodiment The coil of the first voltage type relay KV will always be charged, so that the normally closed contacts 21 and 22 of KV will always disconnect the circuit breaker closing circuit, and the closing pulse (about 150ms) will pass through the normally open contact of KV1. The circuit composed of points 13, 14, the coil of KV1, the normally closed contacts 21, 22 of KA, and the coil of KV is released until the closing command is released.

That is to say, in this embodiment, the current relay KA is used to start the first voltage relay KV. When KA is energized, KV is ready, and when KA is de-energized, KV starts to work. Jump circuit startup time to ensure stable operation of the switch.

As can be seen from Figure 5, the circuit breaker anti-jump module of this embodiment also includes two diodes, which are connected in parallel with the coils A1-A2 of the current relay KA after being connected in series; the function of these two diodes is to stabilize KA The voltage on both sides is used to stabilize the working current of KA; as another implementation, in practical applications, the number of diodes used can be determined according to the actual working current of the current-mode relay.

It can also be seen from Fig. 5 that the first voltage relay KV of this embodiment also includes second normally closed contacts 31, 32, and the second normally closed contacts 31, 32 of the first voltage relay KV are used for series connection In the circuit breaker trip monitoring circuit, by connecting the KV normally closed contacts 31 and 32 in series in the circuit breaker trip monitoring circuit, the action state of the switch can be accurately captured without depending on the auxiliary contact of the circuit breaker.

The jump position monitoring circuit is connected in series with the auxiliary contacts 31 and 32 of KV, which can accurately capture the action state of the switch, and does not depend on the auxiliary contact of the circuit breaker mechanism to start. As long as the switch is closed, the contacts 31 and 32 of KV can Act in time, the jump monitoring is disconnected, and the switch is displayed. If you still rely on the auxiliary contact QF1 of the circuit breaker to start KV at this time, when the opening and closing time of the auxiliary switch QF1 of the circuit breaker is less than the action time of the anti-jump relay KV, the circuit breaker has actually been closed, and the auxiliary contact of the anti-jump relay 31 and 32 of point KV did not operate, and the original monitoring closing circuit became a monitoring anti-jumping circuit, resulting in the opening indicating device not operating and showing the opening state, which in turn misled the background monitoring system of the circuit breaker and caused hidden dangers in power operation.

As other implementations, the circuit breaker anti-jump module of this embodiment can adopt a modular design, and the module adopts an external interface, including a positive input terminal, a negative terminal, a serial connection interface of the closing circuit, and a serial connection interface of the jump monitoring circuit. The integrated design and solidification of internal relays can improve the reliability of switch operation and assembly efficiency, and save installation space.

To sum up, the circuit breaker control loop of this embodiment has the following advantages:

1) The anti-jumping module of the circuit breaker adopts the close cooperation of the voltage type and the current type relay, and the current type relay is connected in series in the closing circuit of the circuit breaker as the starting relay, and the diode is used to clamp the voltage of the current type relay to make it self-adaptive to the closing circuit The change of the medium current, the action time is short, and it can respond quickly to start; the first voltage type relay is used as an anti-jump relay, and the second voltage type relay is used as a self-holding relay, wherein the self-holding relay is energized by the current type relay, 3 It starts within milliseconds, and then the current relay is powered off, the anti-jump relay starts quickly, and the anti-jump module plays a role in protecting the circuit breaker;

Since this embodiment uses a current-type relay to start the anti-jump relay, instead of starting the original auxiliary contact of the circuit breaker, the start of the anti-jump relay is not limited by the operation time of the auxiliary contact of the circuit breaker, and overcomes the problem of opening and closing of the auxiliary contact of the circuit breaker. Insufficient time causes the problem that the anti-jump relay cannot be started, thus effectively solving the problem of the failure of the anti-jump circuit to start, avoiding the occurrence of electric accidents, and improving the reliability of power supply; moreover, the electrical wiring is simple, the action is reliable, and the circuit breaker is optimized. The control loop significantly improves the stability of the circuit breaker operation;

2) The circuit breaker anti-jumping module connects the normally closed contact of the anti-jumping relay in series to the jumping position monitoring circuit to realize the jumping position monitoring function, so that the jumping position monitoring circuit does not need the auxiliary contact of the circuit breaker, which can reduce the electrical connection and improve the circuit breaker. Controller control reliability;

3) Modular design is adopted to solve the problem that the life of the secondary components is short and cannot be consistent with the switch body, which improves the overall operating life of the switch, and is convenient for installation and maintenance, avoiding problems such as electromagnetic resonance and cumbersome installation;

4) Involving the integrated design of voltage type relay, current type relay, etc. Jump position monitoring function;

5) The portable installation method is adopted, the installation of the anti-jump module of the circuit breaker is simple, the space occupied is small, the installation man-hour is shortened, the manufacturing cost is reduced, and the problems of multiple wiring of the original anti-jump relay contacts and large space occupation are solved;

6) Realize the integration and modular design of circuit breaker anti-jumping modules, reduce the failure rate of components, reduce product maintenance costs, enhance market competitiveness, improve the reliability of switch operation, and improve the reliability of power grid operation.

Embodiment of circuit breaker anti-jump module:

The circuit breaker anti-jumping module in this embodiment is the same as the circuit breaker anti-jumping module in the embodiment of the circuit breaker control loop, and will not be repeated here.

Claims (6)

1. A circuit breaker control circuit comprises a circuit breaker anti-tripping module and a circuit breaker closing circuit, wherein the circuit breaker closing circuit comprises a closing switch, a circuit breaker contact and a closing coil which are sequentially connected in series; wherein,

after a coil of the current type relay is connected with a first normally closed contact of a first voltage type relay in series, the coil of the current type relay is connected in a closing loop of the circuit breaker in series; a branch formed by a coil of the current type relay, a first normally closed contact of the first voltage type relay, a breaker contact and a closing coil is used as a first branch;

the normally open contact of the current type relay is connected in series with the coil of the second voltage type relay and then connected in parallel with the first branch circuit;

the normally open contact of the second voltage type relay is connected with the normally open contact of the current type relay in parallel;

and the normally closed contact of the current type relay is connected in series with the coil of the first voltage type relay and then connected in parallel with the coil of the second voltage type relay.

2. The circuit breaker control circuit of claim 1, wherein the circuit breaker trip prevention module further comprises two diodes connected in series and in parallel with the coil of the current-type relay.

3. The circuit breaker control circuit of claim 2 wherein the first voltage source relay further comprises a second normally closed contact, the second normally closed contact of the first voltage source relay for series connection in the circuit breaker trip monitoring circuit.

4. The circuit breaker anti-tripping module is characterized by comprising a current type relay and two voltage type relays; wherein,

after a coil of the current type relay is connected with a first normally closed contact of a first voltage type relay in series, the coil is used for being connected in a closing loop of the circuit breaker in series; the circuit breaker closing circuit comprises a closing switch, a circuit breaker contact and a closing coil which are sequentially connected in series, and a branch consisting of a coil of the current type relay, a first normally closed contact of the first voltage type relay, the circuit breaker contact and the closing coil is used as a first branch;

the normally open contact of the current type relay is connected in series with a coil of a second voltage type relay and then is used for being connected in parallel with the first branch circuit;

the normally open contact of the second voltage type relay is connected with the normally open contact of the current type relay in parallel;

and the normally closed contact of the current type relay is connected in series with the coil of the first voltage type relay and then connected in parallel with the coil of the second voltage type relay.

5. The circuit breaker trip prevention module of claim 4 further comprising two diodes connected in series and in parallel with the coil of the current mode relay.

6. The circuit breaker trip prevention module of claim 5 wherein the first voltage source relay further comprises a second normally closed contact, the second normally closed contact of the first voltage source relay for series connection in a circuit breaker trip monitoring circuit.

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