CN218997677U - Safety control circuit of high-voltage circuit breaker - Google Patents

Abstract

The utility model relates to a safety control circuit of a high-voltage circuit breaker, which comprises a protection anti-jump loop, a switch body anti-jump loop, a parasitic elimination loop and a refusing action protection loop which are connected to the circuit breaker control loop; the parasitic elimination loop and the protection anti-jump loop are connected with the local anti-jump loop of the switch through the anti-action protection loop; the trip protection circuit is connected in series with the trip coil HQ circuit and the trip coil TQ circuit. The utility model realizes the simultaneous access of the anti-jump function of the protection anti-jump switch body and the integrity of the anti-jump protection of the switch; compared with the traditional technical scheme, the parasitic loop elimination measures are adopted, so that the parasitic loop in the control loop in the traditional scheme can be thoroughly eliminated, and the control of the circuit breaker is safer and more reliable; compared with the traditional technical scheme, the switch refusing protection driven by the time relay is additionally arranged, and the potential problem of burning loss of the switching-on/off coil when the switch refuses to operate is eliminated.

Description

Safety control circuit of high-voltage circuit breaker

Technical Field

The utility model relates to the technical field of electric power safety, in particular to a safety control circuit of a high-voltage circuit breaker.

Background

The high-voltage circuit breaker has an extremely important measure in the operation process of preventing the switch from jumping, wherein the switch jumping means that the switch is repeatedly opened and closed due to certain reasons, if the jump preventing measure is not adopted, the breaking capacity of the switch is possibly reduced, and the explosion of the switch is seriously caused, so that the personal safety and the equipment safety are endangered; the jump prevention means that the switch is locked at the tripping position to prevent the switch from jumping, and the jump of the switch has two conditions: the first is that when the switch is closed on a fault line (such as the line switch is closed on a grounding line), relay protection action causes the switch to trip, if the closing pulse is not released at this time, the switch is closed again, and thus the switch jumps repeatedly; the second is that when the switch mechanism has a problem (such as the trip of the mechanism, the occurrence of the jump) and the switch cannot be normally closed, if the switch closing pulse is not released at this time, the switch is repeatedly opened and closed, and the switch jumps, so how to solve the problem that the jump of the switch is needed to be considered at present.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and provides a safety control circuit of a high-voltage circuit breaker, which solves the problem caused by jumping of a switch.

The aim of the utility model is achieved by the following technical scheme: a safety control circuit of a high-voltage circuit breaker comprises a protection anti-jump loop, a switch body anti-jump loop, a parasitic elimination loop and a refusing protection loop which are connected to a circuit breaker control loop; the parasitic elimination loop and the protection anti-jump loop are connected with the local anti-jump loop of the switch through the anti-action protection loop; the trip protection circuit is connected in series with the trip coil HQ circuit and the trip coil TQ circuit.

The protection anti-tripping circuit comprises an HBJ closing latching relay, a TBJV tripping relay, two pairs of TBJV normally-closed contacts, a TBJV normally-open contact and a TBJ normally-open contact; two pairs of TBJV normally-closed contacts are connected in parallel and then connected in series with an HBJ closing latching relay, TBJ normally-open contacts are connected in parallel and then connected in series with a TBJV tripping relay, and the TBJV tripping relay is connected in parallel with the HBJ closing latching relay; the HBJ closing latching relay is connected with the refusing action protection loop.

The switch body anti-jump loop comprises an intermediate relay K1, a breaker sliding auxiliary contact DL, a first breaker normally-closed auxiliary contact DL, an intermediate relay K1 normally-open contact and two pairs of intermediate relay K1 normally-closed contacts; the sliding auxiliary contact DL of the circuit breaker is connected with the normally open contact of the intermediate relay K1 in parallel and then connected with the intermediate relay K1 in series; the normally closed auxiliary contacts DL of the first circuit breaker and the normally closed contacts of the two pairs of intermediate relays K1 are sequentially connected in series and then connected into a switching-on coil HQ loop, and are connected with the intermediate relays K1 in parallel; the other end of the normally closed auxiliary contact DL of the first breaker is connected with a refusing action protection loop.

The parasitic elimination loop comprises a second breaker auxiliary normally-closed contact DL and a second intermediate relay K1 normally-closed contact which are connected in series in a breaker control loop, and the other end of the second intermediate relay K1 normally-closed contact is connected with the first anti-action protection loop.

The refusing protection loop comprises a time relay SJ, wherein the first time relay SJ is used for disconnecting the normally closed contact in a delayed manner, and the second time relay SJ is used for disconnecting the normally closed contact in a delayed manner; the parasitic elimination loop and the protection anti-jump loop are connected with the switch body anti-jump loop through a first time relay SJ delay disconnection normally-closed contact, and are connected with a closing coil HQ loop through a first breaker normally-closed auxiliary node and two pairs of intermediate relays K1 normally-closed contacts which are connected in series; the second time relay SJ is connected in series with a circuit of the switching-on coil TQ by disconnecting the normally-closed contact in a delayed mode.

The utility model has the following advantages: the safety control circuit of the high-voltage circuit breaker realizes the simultaneous access of the anti-jump function of the protection anti-jump and the switch body, and realizes the integrity of the switch anti-jump protection; compared with the traditional technical scheme, the parasitic loop elimination measures are adopted, so that the parasitic loop in the control loop in the traditional scheme can be thoroughly eliminated, and the control of the circuit breaker is safer and more reliable; compared with the traditional technical scheme, the switch refusing protection driven by the time relay is additionally arranged, and the potential problem of burning loss of the switching-on/off coil when the switch refuses to operate is eliminated.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Accordingly, the following detailed description of the embodiments of the present application, provided in connection with the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application. The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1, the present utility model relates to a safety control circuit of a high voltage circuit breaker, comprising a protection anti-jump loop, a switch body anti-jump loop, a parasitic elimination loop and a reactive protection loop, which are connected to a circuit breaker control loop; the parasitic elimination loop and the protection anti-jump loop are connected with the local anti-jump loop of the switch through the anti-action protection loop; the trip protection circuit is connected in series with the trip coil HQ circuit and the trip coil TQ circuit.

Further, the protection anti-jump loop comprises an HBJ closing latching relay, a TBJV tripping relay, two pairs of TBJV normally-closed contacts, a TBJV normally-open contact and a TBJ normally-open contact; two pairs of TBJV normally-closed contacts are connected in parallel and then connected in series with an HBJ closing latching relay, TBJ normally-open contacts are connected in parallel and then connected in series with a TBJV tripping relay, and the TBJV tripping relay is connected in parallel with the HBJ closing latching relay; the HBJ closing latching relay is connected with the refusing action protection loop.

Further, the switch body anti-jump loop comprises an intermediate relay K1, a breaker sliding auxiliary contact DL, a first breaker normally-closed auxiliary contact DL, an intermediate relay K1 normally-open contact and two pairs of intermediate relay K1 normally-closed contacts; the sliding auxiliary contact DL of the circuit breaker is connected with the normally open contact of the intermediate relay K1 in parallel and then connected with the intermediate relay K1 in series; the normally closed auxiliary contacts DL of the first circuit breaker and the normally closed contacts of the two pairs of intermediate relays K1 are sequentially connected in series and then connected into a switching-on coil HQ loop, and are connected with the intermediate relays K1 in parallel; the other end of the normally closed auxiliary contact DL of the first breaker is connected with a refusing action protection loop.

Further, the parasitic cancellation loop comprises a second breaker auxiliary normally-closed contact DL and a second intermediate relay K1 normally-closed contact which are connected in series in the breaker control loop, and the other end of the second intermediate relay K1 normally-closed contact is connected with the first anti-operation protection loop.

Further, the refusing action protection loop comprises a time relay SJ, a normally closed contact which is opened by the first time relay SJ in a delay way and a normally closed contact which is opened by the second time relay SJ in a delay way; the parasitic elimination loop and the protection anti-jump loop are connected with the switch body anti-jump loop through a first time relay SJ delay disconnection normally-closed contact, and are connected with a closing coil HQ loop through a first breaker normally-closed auxiliary node and two pairs of intermediate relays K1 normally-closed contacts which are connected in series; the second time relay SJ is connected in series with a circuit of the switching-on coil TQ by disconnecting the normally-closed contact in a delayed mode.

The working process of the utility model is as follows:

1. and a parasitic loop elimination measure is adopted, a normally closed auxiliary contact of the circuit breaker is connected in series in the TWJ loop, and after the circuit breaker is closed, the normally closed auxiliary contact of the circuit breaker is disconnected, so that the parasitic loop is eliminated, and the defect that an opening and closing lamp is possibly lightened simultaneously after the switch is closed is avoided. The normally closed contact of the body anti-tripping relay K1 is connected in series in the TWJ loop, so that the problems that in the tripping process of the circuit breaker, the normally closed auxiliary contact of the circuit breaker and the auxiliary contact of the switch body anti-tripping are not well matched, a parasitic loop still appears, a K1 coil is electrified, and the switch cannot be closed again after the switch is opened are solved.

2. The switch driven by the time relay is added to refuse the protection, and the protection action process is as follows: when the switch is opened, the +KM-TBJ-DL-SJ-KM loop is connected, if the switch is refused to operate, the loop is always connected until the time relay SJ is set for a certain time, and the normally closed contact SJ of the time relay SJ is disconnected from the opening loop to protect the tripping coil.

When the switch is closed: the +KM-HBJ-DL-SJ-KM loop is connected, if the switch is refused, the loop is always connected until the SJ setting time is reached, and the normally closed contact SJ of the loop is disconnected to protect the closing coil.

When the switch protection anti-jump and the body anti-jump are matched, various defects are easy to generate due to the influence of a parasitic loop, and the matching between the two defects is well treated, so that the two anti-jump loop functions are fully exerted, and the safety of the circuit breaker is ensured; the potential problem that the switch refused to operate and burn the switching-on/off coil exists in the control loop is fully considered, and corresponding practical measures are adopted, so that the method has important theoretical and practical significance for safe operation of power system equipment.

The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims (5)

1. A safety control circuit for a high voltage circuit breaker, characterized by: the circuit breaker comprises a protection anti-jump loop, a switch body anti-jump loop, a parasitic elimination loop and a refusal operation protection loop which are connected to a circuit breaker control loop; the parasitic elimination loop and the protection anti-jump loop are connected with the local anti-jump loop of the switch through the anti-action protection loop; the trip protection circuit is connected in series with the trip coil HQ circuit and the trip coil TQ circuit.

2. A safety control circuit for a high voltage circuit breaker according to claim 1, characterized in that: the protection anti-tripping circuit comprises an HBJ closing latching relay, a TBJV tripping relay, two pairs of TBJV normally-closed contacts, a TBJV normally-open contact and a TBJ normally-open contact; two pairs of TBJV normally-closed contacts are connected in parallel and then connected in series with an HBJ closing latching relay, TBJ normally-open contacts are connected in parallel and then connected in series with a TBJV tripping relay, and the TBJV tripping relay is connected in parallel with the HBJ closing latching relay; the HBJ closing latching relay is connected with the refusing action protection loop.

3. A safety control circuit for a high voltage circuit breaker according to claim 1, characterized in that: the switch body anti-jump loop comprises an intermediate relay K1, a breaker sliding auxiliary contact DL, a first breaker normally-closed auxiliary contact DL, an intermediate relay K1 normally-open contact and two pairs of intermediate relay K1 normally-closed contacts; the sliding auxiliary contact DL of the circuit breaker is connected with the normally open contact of the intermediate relay K1 in parallel and then connected with the intermediate relay K1 in series; the normally closed auxiliary contacts DL of the first circuit breaker and the normally closed contacts of the two pairs of intermediate relays K1 are sequentially connected in series and then connected into a switching-on coil HQ loop, and are connected with the intermediate relays K1 in parallel; the other end of the normally closed auxiliary contact DL of the first breaker is connected with a refusing action protection loop.

4. A safety control circuit for a high voltage circuit breaker according to claim 1, characterized in that: the parasitic elimination loop comprises a second breaker auxiliary normally-closed contact DL and a second intermediate relay K1 normally-closed contact which are connected in series in a breaker control loop, and the other end of the second intermediate relay K1 normally-closed contact is connected with the first anti-action protection loop.

5. A safety control circuit for a high voltage circuit breaker according to claim 1, characterized in that: the refusing protection loop comprises a time relay SJ, wherein the first time relay SJ is used for disconnecting the normally closed contact in a delayed manner, and the second time relay SJ is used for disconnecting the normally closed contact in a delayed manner; the parasitic elimination loop and the protection anti-jump loop are connected with the switch body anti-jump loop through a first time relay SJ delay disconnection normally-closed contact, and are connected with a closing coil HQ loop through a first breaker normally-closed auxiliary node and two pairs of intermediate relays K1 normally-closed contacts which are connected in series; the second time relay SJ is connected in series with a circuit of the switching-on coil TQ by disconnecting the normally-closed contact in a delayed mode.

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