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Intelligent circuit breaker online monitoring and electrical endurance evaluation method

A technology of intelligent circuit breaker and life evaluation, applied in circuit breaker testing and other directions, can solve problems such as affecting the reliability and life of circuit breakers, lack of monitoring and loss of arc signals, shortening arcing time, improving reliability, Predict accurate performance

Pending Publication Date: 2020-10-23
XJ ELECTRIC +5
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AI Technical Summary

Problems solved by technology

[0003] As an important primary equipment in power transmission and distribution, the circuit breaker will cause heavy losses if it fails. The arc generated during the breaking process of the circuit breaker can ablate the contacts, affecting the reliability and life of the circuit breaker. It has been monitoring its operation for a long time During the voltage and current signals, there is a lack of monitoring of the arc signal during the breaking process of the circuit breaker

Method used

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  • Intelligent circuit breaker online monitoring and electrical endurance evaluation method
  • Intelligent circuit breaker online monitoring and electrical endurance evaluation method
  • Intelligent circuit breaker online monitoring and electrical endurance evaluation method

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Experimental program
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Effect test

Embodiment

[0053] The key parameters of circuit breakers are monitored and calculated online. Table 1 shows the online monitoring and calculated data of six circuit breakers.

[0054] Table 1 Measured circuit breaker data

[0055]

[0056] Set the evaluation set as V={YP LP Z CP JP GP}, where YP means excellent product, LP means good product, Z means average product, CP means poor product, JP means inferior product, GP means extremely poor product, and the corresponding integer universe

[0057] N={-4,-3,-2,-1,0,1,2,3,4}

[0058] The distribution factor of the first opening phase is defined as t=max(c a ,c b ,c c )

[0059] where c i is the distribution coefficient of the first opening phase, no i is the number of times that the first open phase appears in a certain phase, n i One-third of the total number of breaks. Because of the judging factor P i Each variable mainly changes linearly, so P i Transform according to the triangular membership function, and its membership...

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Abstract

The invention relates to an intelligent circuit breaker online monitoring and electrical endurance evaluation system and a control method. Voltage sensors are connected to the upper end and the lowerend of a fracture of a circuit breaker. In the opening process of the circuit breaker, the voltages at the two ends of the fracture can be monitored, subtraction is conducted on the voltages at the two ends through a differentiator, and voltage changes at the two ends of an electric arc in the opening process of the circuit breaker can be obtained. Meanwhile, the circuit breaker is also connectedwith a current sensor, current changes in the on-off arcing process can be obtained, a voltage sensor and the current sensor are connected into feeder terminal equipment, the arcing time can be obtained through the wave recording function of the feeder terminal equipment, and then the operation life of the circuit breaker can be intelligently evaluated according to the three monitored parameters,namely, the arc voltage, the arc current and the arcing time. The feeder terminal equipment monitors the current change of the line on line, can control the circuit breaker mechanism to execute the on-off operation at the current zero crossing point, shortens the arcing time, improves the reliability of the circuit breaker, and prolongs the service life of the circuit breaker.

Description

technical field [0001] The invention relates to the technical field of power equipment monitoring, in particular to an intelligent circuit breaker online monitoring and electrical life evaluation system and control method. Background technique [0002] The ubiquitous power Internet of Things is the core task of implementing the national grid's "three-type, two-network, world-class" strategic goal, which requires power transmission and distribution equipment to be able to achieve comprehensive awareness of operating status and full penetration of services. This requires deep integration of primary and secondary equipment to comprehensively monitor the online operation status of primary equipment. [0003] As an important primary equipment in power transmission and distribution, the circuit breaker will cause heavy losses if it fails. The arc generated during the breaking process of the circuit breaker can ablate the contacts, affecting the reliability and life of the circuit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 宁昕张凯吴小钊李瑞生徐铭铭李俊豪张文凯姚德贵白维正马建伟崔宇张艳晓姜亚军陈明孙芊董轩
Owner XJ ELECTRIC
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