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The three-phase inconsistency of the circuit breaker body with monitoring function protects the anti-misoperation circuit

A circuit breaker body and anti-maloperation technology, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of protection circuit misoperation and refusal to operate, cannot meet the safe operation of the power grid, and the three-phase difference of the circuit breaker body. Achieve the effect of satisfying system stability, good independence and ensuring safe operation

Active Publication Date: 2021-06-01
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Connecting the contacts of the two outlet circuits directly in series will also lead to the problem of refusal of the protection circuit caused by a set of circuit failures
[0004] The existing three-phase inconsistency protection circuit of the circuit breaker body has frequent misoperation and refusal to operate, which cannot meet the needs of safe operation of the power grid

Method used

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  • The three-phase inconsistency of the circuit breaker body with monitoring function protects the anti-misoperation circuit
  • The three-phase inconsistency of the circuit breaker body with monitoring function protects the anti-misoperation circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0018] figure 1 It is a circuit topology diagram of a three-phase inconsistency protection anti-malfunction circuit of a circuit breaker body with a monitoring function provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the three-phase inconsistency protection anti-maloperation circuit of the circuit breaker body with monitoring function includes:

[0019] The first starting circuit 110, the second starting circuit 210, the first outlet circuit 120, the second outlet circuit 220, the first monitoring circuit 130, the second monitoring circuit 230, the first DC power supply and the second DC power supply; the first contact Combination 111, second contact combination 211, first time relay, second time relay, first tripping relay, second tripping relay, first monitoring relay and second monitoring relay; the first time relay includes first time relay coil KT1 -X, the first normally open contact KT1-1 of the first time relay and the second normally ope...

Embodiment 2

[0055] This embodiment is based on the above-mentioned embodiment, and an alarm circuit, a tripping coil and a resistor are added on the basis of the above-mentioned embodiment. figure 2 It is a circuit topology diagram of a circuit breaker body with a monitoring function for three-phase inconsistency protection anti-malfunction circuit provided by Embodiment 2 of the present invention, see figure 2 , explanations of terms that are the same as or corresponding to those in the foregoing embodiments will not be repeated in this embodiment.

[0056] The three-phase inconsistency protection anti-maloperation circuit of the circuit breaker body with monitoring function also includes: an alarm circuit 310; the first monitoring relay also includes the second normally closed contact SLJ1-2 of the first monitoring relay, and the second monitoring relay also includes the second The second normally closed contact SLJ2-2 of the second monitoring relay; the alarm circuit 310 includes the...

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Abstract

The invention discloses an anti-misoperation circuit for three-phase inconsistent protection of a circuit breaker body with a monitoring function. The circuit includes first and second starting circuits, first and second outlet circuits, first and second monitoring circuits, and first and second DC power sources; the starting circuit includes a combination of contacts and a time relay coil connected in series at both ends of the DC power source, connected in series with the DC power source. The two time relays at both ends of the power supply have a pair of normally open contacts and a trip relay coil respectively, and also include the normally closed contacts of the monitoring relay connected in parallel at both ends of the normally open contacts of the time relay; the outlet circuit includes the normally open contact group of the trip relay, The first end is connected to the first end of the DC power supply after the contact combination; the monitoring circuit is connected in parallel with both ends of the contact combination, including the monitoring relay coil. Compared with the prior art, even if the outlet circuit is misconnected, the present invention will not cause the outlet to trip by mistake, which can effectively prevent the switch from malfunctioning; the two sets of circuits are independent of each other, which can effectively prevent the switch from refusing to act.

Description

technical field [0001] The embodiment of the present invention relates to the field of circuit breaker technology, in particular to a three-phase inconsistency protection anti-misoperation circuit of a circuit breaker body with a monitoring function. Background technique [0002] In the power system, the three-phase inconsistent operation of the circuit breaker occurs frequently, which seriously affects the stability of the system. In order to avoid the damage to the system caused by the three-phase inconsistency of the circuit breaker body, the circuit breaker of 220kV and above must be equipped with the three-phase inconsistency protection of the body. [0003] The three-phase inconsistency protection circuit of the 220kV and above circuit breaker body currently in operation adopts the same circuit breaker configuration with the same two sets of body three-phase inconsistency protection circuit scheme. However, due to complex wiring and harsh operating environment, there ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H02H7/26
CPCH02H7/222H02H7/262H02H7/268
Inventor 倪苗升陈晓彬孙玉彤
Owner GUANGDONG POWER GRID CO LTD
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