《机电工程》杂志社科技期刊核心期刊论文投稿机电一体化机械、仪表电工自动化、计算机浙江大学主办

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Novel measuring method for over current characteristic of low voltage circuit breakers

Published:2015-04-08 author:ZHANG Hao，XIE Qiu-hui，Cai Chun-hao，FU Pei-gang，ZHAO Yong，ZHENG Lun Browse: 3534 Check PDF documents

Novel measuring method for over current characteristic of

low voltage circuit breakers

ZHANG Hao，XIE Qiu-hui，Cai Chun-hao，FU Pei-gang，ZHAO Yong，ZHENG Lun

（Shanghai Entry-Exit Inspection and Quarantine Bureau，Shanghai 200002，China）

Abstract：Aiming at the problems of poor stability，short service life and high power consumption in the traditional equipments

measuring over- current characteristic for low voltage circuit breaker，the digital controlled power supply technology and a novel

machinery structure was investigated. Based on two technology above，a novel measuring method for over current characteristic test was

proposed. After the analysis of electrical circuit diagram，the relationship between the scheme and the mathematical model was

established and a method base on digital root mean square algorithm for current regulation was presented. The novel machinery structure

was proposed for low power consumption. The equipment designed by the proposed measuring method were evaluated on the two aspects

above：power supply technology and machinery structure. A few diagrams of experimental waveforms，a picture of the hardware circuit and

an engineering drawings of machinery structure were given. The over current inspection test of low voltage circuit breakers was tested by

the proposed equipment. The experimental results indicate that the accuracy，stability and life time of the proposed equipment are better

than the traditional ones.

Key words：delayed tripping characteristic of low voltage circuit breakers；digital controlled power supply

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