CN220107565U

CN220107565U - Circuit for preventing circuit breaker control circuit disconnection false alarm

Info

Publication number: CN220107565U
Application number: CN202320915352.4U
Authority: CN
Inventors: 杨维胜; 侯小虎; 任丽先; 郭文; 夏建华; 肖江滔; 张舸
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2023-04-21
Filing date: 2023-04-21
Publication date: 2023-11-28
Anticipated expiration: 2033-04-21

Abstract

A circuit for preventing the false alarm of the broken line of the control circuit of the circuit breaker, the circuit includes the monitor circuit of closing a floodgate, break brake monitor circuit and trouble alarm circuit; the switching-on monitoring loop comprises a switching-on loop monitoring relay TWJ exciting coil and a breaker normally closed switch S1 which are connected in series, and two ends of the switching-on monitoring loop are connected with a direct current anode and a direct current cathode; the brake-separating monitoring loop comprises a brake-separating loop monitoring relay HWJ exciting coil and a breaker normally open switch S2 which are connected in series, and two ends of the brake-separating monitoring loop are connected with a direct current anode and a direct current cathode; the fault alarm loop comprises a normally closed switch of a switching-off loop monitoring relay HWJ, a normally closed switch of a switching-on loop monitoring relay TWJ and a delay relay TB which are connected in series, and two ends of the fault alarm loop are connected with a monitoring system T1. The occurrence of false alarm of disconnection of a control loop in the operation process of the circuit breaker can be prevented; and the original circuit breaker control loop can not be changed, and only a time relay is needed to be added in the control loop disconnection alarm loop.

Description

Circuit for preventing circuit breaker control circuit disconnection false alarm

Technical Field

The utility model relates to the technical field of power plant equipment, in particular to a circuit for preventing a circuit breaker control loop from being broken and giving false alarms.

Background

Circuit breakers are important primary devices in power systems, and are of great importance for the monitoring of their control loops. When the control loop is broken, the alarm is given in time, and the failure of the circuit breaker can be avoided.

As shown in fig. 1 and 2, the conventional control loop disconnection warning circuit is composed of a HWJ opening loop monitoring relay and a TWJ closing loop monitoring relay which are connected in series by normally closed contacts. When the breaker is in a closing position, the HWJ opening circuit monitoring relay is excited, the HWJ normally-closed contact is opened, and the control circuit disconnection warning circuit is not conducted. When the breaker is at the opening position, the TWJ closing circuit monitors the excitation of the relay, the normally closed contact of the TWJ is opened, and the control circuit disconnection alarming circuit is not conducted.

When the breaker is at the closing position, the TWJ closing circuit monitoring relay is not excited any more, and the normally closed contact of the TWJ is conducted. If the opening circuit is broken, the HWJ opening circuit monitoring relay is not excited any more, the HWJ normally closed contact is also conducted, and the control circuit opening alarm circuit is conducted to alarm.

When the breaker is in the opening position, the HWJ opening circuit monitoring relay is not excited any more, and the HWJ normally-closed contact is conducted. If the closing loop is broken, the TWJ closing loop monitoring relay is not excited any more, the normally closed contact of the TWJ is also conducted, and the control loop broken line alarming circuit conducts and alarms.

The existing defects are that: when the circuit breaker is in the operation process, because the overturning of the circuit breaker body contact, there is a short time, the HWJ opening circuit monitoring relay and the TWJ closing circuit monitoring relay are not excited, and the HWJ normally-closed contact and the TWJ normally-closed contact are all conducted, so that the control circuit disconnection alarming circuit alarms by mistake and causes interference to operation and maintenance personnel.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a circuit for preventing the false alarm of the disconnection of a circuit breaker control loop, which can avoid the false alarm of the disconnection of the circuit breaker control loop.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a circuit for preventing the false alarm of the broken line of the control circuit of the circuit breaker, the circuit includes the monitor circuit of closing a floodgate, break brake monitor circuit and trouble alarm circuit;

the switching-on monitoring loop comprises a switching-on loop monitoring relay TWJ exciting coil and a breaker normally closed switch S1 which are connected in series, and two ends of the switching-on monitoring loop are connected with a direct current anode and a direct current cathode;

the brake-separating monitoring loop comprises a brake-separating loop monitoring relay HWJ exciting coil and a breaker normally open switch S2 which are connected in series, and two ends of the brake-separating monitoring loop are connected with a direct current anode and a direct current cathode;

the fault alarm loop comprises a normally closed switch of a switching-off loop monitoring relay HWJ, a normally closed switch of a switching-on loop monitoring relay TWJ and a delay relay TB which are connected in series, and two ends of the fault alarm loop are connected with a monitoring system T1.

The circuit for preventing the circuit breaker control loop from being broken in false alarm can prevent the circuit breaker from being broken in false alarm in the operation process; and the original circuit breaker control loop can not be changed, and only a time relay is needed to be added in the control loop disconnection alarm loop.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic diagram of a monitoring circuit of the present utility model;

FIG. 2 is a schematic diagram of a conventional fault alarm circuit according to the present utility model;

FIG. 3 is a schematic diagram of a modified fault alarm circuit.

In the figure: the circuit breaker normally closed switch S1, the circuit breaker normally open switch S2, the opening loop monitoring relay HWJ, the closing loop monitoring relay TWJ, the delay relay TB and the monitoring system T1.

Detailed Description

As shown in fig. 1-3, a circuit for preventing a circuit breaker control loop from breaking a line and false alarming comprises a closing monitoring loop, a breaking monitoring loop and a fault alarming loop;

Examples:

1-2, a circuit for preventing the false alarm of the disconnection of a control loop of a circuit breaker is mainly formed by a TWJ closing loop monitoring relay and a normally closed contact TWJ of the TWJ closing loop monitoring relay, wherein the normally closed contact HWJ of the HWJ opening loop monitoring relay and the HWJ opening loop monitoring relay are as shown in figures 1-3: 1-2, a time relay TB.

The TWJ closing circuit monitoring relay is connected in parallel to the closing circuit of the circuit breaker and monitors the closing circuit. When the breaker is at the opening position, a normally closed contact S1 of a breaker body mechanism is conducted, an interlocking loop is conducted when normal, if the closing control loop does not have a broken line condition, the TWJ closing loop monitoring relay is excited, a normally closed contact TWJ of the TWJ closing loop monitoring relay is 1-2 disconnected, and the broken line of the breaker control loop does not alarm.

When the breaker is at the opening position, the normally open contact S2 of the breaker body mechanism is disconnected, and at the moment, the HWJ opening circuit monitoring relay is not excited, and the HWJ opening circuit monitoring relay normally closed contact HWJ:1-2 is conducted. If the closing control loop is broken, the TWJ closing loop monitoring relay is not excited any more, the TWJ normally closed contacts TWJ 1-2 are also conducted, and the control loop breaking alarm circuit conducts and alarms after the time relay TB delays.

HWJ brake release circuit monitoring relays are connected in parallel to the brake release circuit of the circuit breaker, and monitor the brake release circuit. When the breaker is at the closing position, the normally open contact S2 of the breaker body mechanism is conducted, the interlocking loop is conducted when normal, if the breaking control loop does not have the broken line condition, at the moment, the HWJ breaking loop monitoring relay is excited, the HWJ breaking loop monitoring relay normally closed contact HWJ:1-2 is disconnected, and the breaking of the breaker control loop does not alarm.

When the breaker is at a closing position, a normally-closed contact S1 of a breaker body mechanism is disconnected, at the moment, the TWJ closing circuit monitoring relay is not excited, and a normally-closed contact TWJ of the TWJ closing circuit monitoring relay is conducted 1-2. If the time-division brake control loop is broken, the HWJ brake-division brake loop monitoring relay is not excited any more, the HWJ normally closed contact is also conducted, and the time relay TB delays, so that the control loop broken line alarm circuit conducts and alarms.

Normally-closed contacts TWJ of TWJ closing circuit monitoring relay 1-2, HWJ opening circuit monitoring relay normally-closed contact HWJ:1-2 and a time relay TB are connected in series to form a circuit for preventing the circuit breaker control loop from false alarm.

The time relay TB is a modularized time delay relay, and in a circuit for preventing the circuit breaker control loop from being broken and giving false alarm, when the normally closed contact TWJ of the TWJ closing loop monitoring relay is 1-2 and HWJ, the normally closed contact HWJ of the TWJ closing loop monitoring relay is: after 1-2 is conducted, the time relay TB starts to count, the time can be set, the setting of the time setting value is considered according to the duration time of avoiding the intermediate state that the body contacts S1 and S2 are both disconnected in the operation process of the circuit breaker, (for example, 50ms is set), the time relay TB can be turned into a conducting state after 50ms, and a circuit for preventing the circuit breaking false alarm of the circuit breaker control circuit can be conducted.

The TWJ closing circuit monitors normally closed contacts TWJ 1-2 of the relay, and a terminal TWJ 1 of the normally closed contacts TWJ is connected to a public end of the monitoring system. Normally-closed contact TWJ:2 terminal is connected to HWJ opening circuit monitoring relay normally-closed contact HWJ:1 terminal. HWJ opening circuit monitoring relay normally closed contact HWJ: the 2 terminal is connected to the time relay TB: a1 terminal, time relay TB: the L terminal is connected with the negative electricity end of the monitoring system and defines an alarm signal as follows: the circuit breaker control loop breaks.

When the breaker is in operation, the body contacts S1 and S2 will turn over, and there will be about 30ms of intermediate state, at this time, the body contacts S1 and S2 are both in the off state, and the conventional control loop disconnection alarm loop will alarm, resulting in false alarm. In the utility model, as the time relay TB is added, a delay loop is formed, and the intermediate state that the contacts S1 and S2 of the body are disconnected in the operation process of the circuit breaker is avoided by setting delay time of 50 ms. When the operation of the circuit breaker is finished, the contacts S1 or S2 of the circuit breaker body are conducted, the TWJ closing circuit monitoring relay or the HWJ opening circuit monitoring relay is excited, and the normally closed contacts TWJ are 1-2 or the normally closed contacts HWJ:1-2 can be disconnected, and a circuit for preventing the circuit breaking false alarm of the circuit breaker control loop is not conducted in the whole operation process, so that the false alarm is avoided.

Working principle:

when the breaker is in operation, the body contacts S1 and S2 will turn over, and there will be about 30ms of intermediate state, at this time, the body contacts S1 and S2 are both in the open state, and the circuit will give an alarm for the traditional control circuit disconnection alarm circuit. In the utility model, as the time relay TB is added, a delay loop is formed, and the intermediate state that the contacts S1 and S2 of the body are disconnected in the operation process of the circuit breaker is avoided by setting delay time of 50 ms. When the operation of the circuit breaker is finished, the contacts S1 or S2 of the circuit breaker body are conducted, the TWJ closing circuit monitoring relay or the HWJ opening circuit monitoring relay is excited, and the normally closed contacts TWJ are 1-2 or the normally closed contacts HWJ:1-2 can be disconnected, and a circuit for preventing the circuit breaking false alarm of the circuit breaker control loop is not conducted in the whole operation process, so that the false alarm is avoided.

When the breaker is at the opening position, the normally open contact S2 of the breaker body mechanism is disconnected, and at the moment, the HWJ opening circuit monitoring relay is not excited, and the HWJ opening circuit monitoring relay normally closed contact HWJ:1-2 is conducted. If the switching-on control loop is broken, the TWJ switching-on loop monitoring relay is not excited any more, the normally closed contact of the TWJ is also conducted, and the circuit conduction alarm of the circuit breaking false alarm of the circuit breaker control loop is prevented through the delay of the time relay TB.

When the breaker is at a closing position, a normally-closed contact S1 of a breaker body mechanism is disconnected, at the moment, the TWJ closing circuit monitoring relay is not excited, and a normally-closed contact TWJ of the TWJ closing circuit monitoring relay is conducted 1-2. If the breaking control loop is broken, the HWJ breaking loop monitoring relay is not excited any more, the HWJ normally closed contact is also conducted, and the circuit conduction alarm for preventing the breaking false alarm of the breaker control loop is prevented after the time relay TB delays.

Claims

1. A circuit for preventing circuit breaker control circuit disconnection false alarm is characterized in that: the circuit comprises a closing monitoring loop, a separating monitoring loop and a fault alarm loop;