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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (3 ): 20-    DOI: 10.1631/jzus.2007.A0453
    
Research on the overload protection reliability of moulded case circuit-breakers and its test device
LI Kui, LU Jian-guo, WU Yi, QIN Zhi-jun, YAO Dong-mei
Electrical Apparatus Institute, Hebei University of Technology, Tianjin 300130, China
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Abstract  This paper analyzed the reliability and put forward the reliability index of overload protection for moulded case circuit breaker. The success rate was adopted as its reliability index of overload protection. Based on the reliability index and the reliability level, the reliability examination plan was analyzed and a test device for the overload protection of moulded case circuit-breaker was developed. In the reliability test of overload protection, two power sources were used, which reduced the time of conversion and regulation between two different test currents in the overload protection test, which made the characteristic test more accurate. The test device was designed on the base of a Windows system, which made its operation simple and friendly.

Key words： Moulded case circuit breakers      Overload protection      Reliability      Test device     
Received: 19 December 2006     
CLC:  TB114.3  
  O224  
  O211.6  
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LI Kui
LU Jian-guo
WU Yi
QIN Zhi-jun
YAO Dong-mei
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LI Kui, LU Jian-guo, WU Yi, QIN Zhi-jun, YAO Dong-mei. Research on the overload protection reliability of moulded case circuit-breakers and its test device. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(3 ): 20-.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A0453     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I3 /20

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