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Control circuit for preventing tripping and closing coil of circuit breaker from being burnt out

A technology for controlling circuits and circuit breakers, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as waste of bureau assets, manpower, and material resources, and achieve the effects of saving equipment, preventing burnout, and saving human resources.

Inactive Publication Date: 2021-08-27
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It continues to cause a lot of waste of manpower and material resources to the bureau's assets every year

Method used

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  • Control circuit for preventing tripping and closing coil of circuit breaker from being burnt out
  • Control circuit for preventing tripping and closing coil of circuit breaker from being burnt out
  • Control circuit for preventing tripping and closing coil of circuit breaker from being burnt out

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: as Figure 2-Figure 3 As shown, a control circuit for preventing circuit breaker tripping and closing coils from burning out includes a tripping circuit and a closing circuit. Both the tripping circuit and the closing circuit are respectively connected in series to a circuit connected in parallel by a time relay TV and its auxiliary normally closed node.

[0018] For the closing circuit of the 10kV outlet interval circuit breaker, after node 11 (closing holding node), the normally closed auxiliary node TV_F1 of the time relay TV1 is connected in series, and the time relay TV1 is connected in parallel at node 11 (such as image 3 shown). For the tripping circuit of the 10kV outlet interval circuit breaker, connect the normally closed auxiliary node TV_F2 of the time relay TV2 in series after node 17 (trip holding node), and connect the time relay TV2 in parallel at node 17 (such as image 3 shown).

[0019] Preferably, the above-mentioned time relay is fi...

Embodiment 2

[0022] Embodiment 2: A kind of control method of the control circuit that prevents the circuit breaker from tripping and closing the coil burns out is: in the circuit breaker control loop, connect a link connected in parallel by the time relay and its normally closed node in series, set the setting of the time relay The fixed time is 100ms. When the circuit breaker is normally opened and closed, the current duration is about 50ms~60ms, and the time relay will not act. The auxiliary node is opened, the control circuit is cut off, and the circuit breaker tripping coil is prevented from burning out due to the long duration of the current.

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PUM

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Abstract

The invention discloses a control circuit for preventing a tripping and closing coil of a circuit breaker from being burnt out. The control circuit comprises a tripping loop and a closing loop, wherein the tripping loop and the closing loop are respectively connected in series into a loop formed by connecting a time relay and an auxiliary normally-closed node thereof in parallel. The circuit breaker tripping and closing coil can be prevented from being burnt out due to overlong current duration time, so that equipment is saved, the workload of a power transformation maintenance group, a relay protection group and a high-voltage test group of a power transformation management station can be greatly reduced, human resources are saved, and the working efficiency is improved.

Description

technical field [0001] The invention relates to a control circuit for preventing circuit breaker tripping and closing coils from burning out, and belongs to the technical field of preventing circuit breaker tripping and closing coils from burning out. Background technique [0002] For power grid operation, substation line operation plan, line fault handling, etc., all depend on the operation of the circuit breaker, and this operation is based on the secondary control loop of circuit breaker tripping and closing. At present, the secondary control circuit of the circuit breaker, taking the trip circuit as an example, such as figure 1 As shown, when the relay protection cuts off the fault or the operator operates the circuit breaker, it is easy to continue to supply power to the control circuit, which will cause the tripping coil to be excited for a long time and burn out (the normal tripping coil excitation requires about 60ms of power supply time. , when the power supply las...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
CPCH02H7/222
Inventor 张朝学丁宇洁李为平贾先平张天卫邱玉涛郭成蛟赵海刘军吴英帅张彬王晟杨波缪高策李佳睿
Owner GUIZHOU POWER GRID CO LTD