ZHANG Hao1, XIE Qiu hui1, CAI Chun hao1, FU Pei gang1, ZHAO Yong1, ZHU Ming lei2,JUN Hongquan1, WU Fei1, ZHENG Lun1

(1. Shanghai Entry\|Exit Inspection and Quarantine Bureau,Shanghai 200002, China;

2. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

 

Abstract: Aiming at the problems of high power consumption, short equipment life and low automatic level in the traditional equipments large\|current characteristic measuring process of low voltage circuit breaker, a general survey report about equipments used in Chinese production enterprises and quality inspection agencies was done. Based on summaries of relevant national testing standards and enterprise testing process, great significance of large\|current testing was proposed to inspection of low voltage circuit breakers. After the analysis of electrical circuit diagram and mechanical design, two kinds of electrical scheme were proposed, the one was based on voltage regulator and the other was electronic power supply separately.Advantages of the electronic power supply scheme were discussed and both advantages and disadvantages of large current test fixture structure were discussed in mechanical design. The advantages and disadvantages of the two schemes were presented in terms of power consumption, commonality, cost and automation. The research results indicate that the electronic power supply scheme is worth to apply to related equipments within the industy, it is conducive to reducing the power consumption of equipment, prolonging the life of equipment and improving the automation level.

Key words: delayed tripping characteristic of low voltage circuit breakers; large current testing; inspection equipment