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Method for monitoring wear of circuit breaker contact, and circuit breaker

A contact wear and circuit breaker technology, which is applied in the field of circuit breaker contact wear monitoring, can solve problems such as inaccuracy, achieve simple structure, realize online contact wear monitoring, and achieve the effect of low cost

Inactive Publication Date: 2015-09-02
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this method is not accurate enough, because in the process of opening and closing, due to the different influencing factors such as closing time and breaking current, the loss of contacts is not the same for each closing. The contact wear caused by each closing is the same, which is out of the actual situation

Method used

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  • Method for monitoring wear of circuit breaker contact, and circuit breaker
  • Method for monitoring wear of circuit breaker contact, and circuit breaker
  • Method for monitoring wear of circuit breaker contact, and circuit breaker

Examples

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Embodiment Construction

[0018] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0019] The contact system in the circuit breaker includes a static contact system, a moving contact system and a moving contact driving mechanism. During the opening and closing process, the moving contact driving mechanism drives the moving contact to switch between the opening position and the closing position. . After careful analysis, it can be found that in the state of contact wear, the position of the moving contact in the closed state will change relative to the position of the contact without wear, and the position change is positively related to the degree of wear of the contact, that is, the contact The greater the wear, the greater the change in the position of the moving contact in the closed state. Therefore, based on this point, online monitoring of contact wear can be realized by detecting the position and state of the moving contact. ...

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Abstract

The invention discloses a method for monitoring the wear of a circuit breaker contact. According to the invention, an auxiliary switch in mechanical coupling with a movable contact is provided, and is configured in a manner that the auxiliary switch is at a first on-off state under the condition that contact wear does not reach preset maximum safety wear when the movable contact is closed; the auxiliary switch is at a second on-off state under the condition that the contact wear reaches or exceeds the preset maximum safety wear when the movable contact is closed; and the on-line monitoring of the contact wear is carried out according to the closing / opening states of the circuit breaker and the on-off states of the auxiliary switch. The invention also discloses a circuit breaker. Compared with the prior art, the auxiliary switch can achieve the on-line monitoring of the contact wear, can carry out monitoring during closing / opening, is simple in structure, and is easy to implement.

Description

technical field [0001] The invention relates to a circuit breaker contact wear monitoring method and a circuit breaker, which belong to the technical field of low-voltage electrics. Background technique [0002] A circuit breaker (English name: circuit-breaker, circuit breaker) refers to a device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time switchgear. As a basic electrical component, circuit breakers are widely used in distribution networks. [0003] A circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a trip unit, and a housing. The contact system of a circuit breaker usually includes static contacts and moving contacts that cooperate with each other, and a driving mechanism for the moving contacts. The moving contact driving mechanism can drive the moving contact to make the moving conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H73/04
CPCH01H1/0015
Inventor 陆伟文谢心意陶涛
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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