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SF6 circuit breaker arc contact failure detection method

A detection method and arc contact technology, applied in the field of power transmission and transformation testing, can solve problems such as arc contact erosion, and achieve the effect of accurate reflection

Inactive Publication Date: 2017-04-05
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For capacitor bank circuit breakers, the arcing contact erosion is more serious due to the presence of the closing inrush current

Method used

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  • SF6 circuit breaker arc contact failure detection method
  • SF6 circuit breaker arc contact failure detection method
  • SF6 circuit breaker arc contact failure detection method

Examples

Experimental program
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Embodiment Construction

[0022] A SF6 circuit breaker arc contact failure detection method, the SF6 circuit breaker arc contact includes a moving arc contact and a static arc contact, and the moving arc contact is a moving arc contact finger with 8 fingers (a finger with a hole set), the static arcing contact is a columnar structure; the moving arcing contact finger and the static arcing contact are in contact with each other, and the failure of the arcing contact of the SF6 circuit breaker includes the contact resistance of the arcing contact being greater than the set resistance threshold and the contacting of the arcing contact The stroke reduction threshold; the erosion threshold is set directly according to the length of the contact used, and its setting has no effect on the contact resistance of the arcing contact. The contact resistance of the head is mainly related to the radial erosion degree of the static arc contact. Therefore, the set resistance threshold is obtained by the radial auxiliary...

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Abstract

The invention discloses an SF6 circuit breaker arc contact failure detection method. SF6 circuit breaker arc contacts comprise a moving arc contact and a static arc contact. The moving arc contact and the static arc contact are in sleeving contact. The SF6 circuit breaker arc contact failure comprises conditions in which the arc contact contact resistance is larger than a set resistance threshold and an arc contact contact travel reduction threshold respectively. The set resistance threshold is acquired by a radial auxiliary measurement and verification method, and the set contact travel reduction threshold is verified by an axial auxiliary measurement and verification method. The failure of the circuit breaker arc contact can be accurately judged; according to dynamic contact resistance analysis and by adopting a method of comparison before and after erosion, the contact travel of the circuit breaker arc contact is evaluated; and according to experimental data of the method, a maintenance decision for the circuit breaker is guided to be made.

Description

technical field [0001] The invention belongs to power transmission and transformation testing, and particularly relates to a method for detecting failure of an arc contact of an SF6 circuit breaker. The method can accurately evaluate the state of the arc contact eroded by electric arc and mechanical friction and wear. Background technique [0002] The SF6 circuit breaker has a main contact and an arc contact, the main contact undertakes the task of passing the current, and the arc contact undertakes the task of connecting the arc. When the circuit breaker is closed, the arcing contacts are connected before the main contacts to generate a pre-breakdown arc. When the circuit breaker is opened, the arcing contacts are separated behind the main contacts to generate a breaking arc. Due to the ablation of the arc, material loss occurs at the end of the arc contact, and the surface morphology changes; when closing, the static arc contact at high temperature after arc ablation is in...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/3271
Inventor 傅中李志兵王刘芳刘北阳程登峰杨为杨景刚刘媛
Owner CHINA ELECTRIC POWER RES INST
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