Browse > Article
http://dx.doi.org/10.5207/JIEIE.2006.20.2.068

Operating Characteristics of Molded Case Circuit Breakers by Harmonic Currents  

Jeon, Jeong-Chay (한국전기안전공사 전기안전연구원)
Yoo, Jae-Geun (한국전기안전공사 전기안전연구원)
Lee, Sang-Ick (한국전기안전공사 전기안전연구원)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.20, no.2, 2006 , pp. 68-74 More about this Journal
Abstract
Malfunction and nuisance tripping of molded case circuit breaker(MCCB) caused by harmonic currents have been reported. But no data is available on the behavior of MCCB under harmonic currents. This paper tested the effects of harmonic currents on four common types of MCCB(thermal, thermal magnetic, magnetic and electronic types). Results of experiment detected no nuisance tripping with any of the breakers tested under test currents, included harmonic current, below rated currents. Additionally it was found that varying harmonic loading conditions did not affect manufacturer specified trip times for thermal only and thermal magnetic circuit breakers. However, under overloaded conditions, trip times of the magnetic only circuit breakers were gradually slowed according to increasing of harmonic currents, and it could cause hazardous overheating of cables. So, the use of magnetic only circuit breakers in the place harmonic currents we serious must be avoided.
Keywords
Malfunction; Nuisance tripping; Molded case circuit breakers; Harmonic currents;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J. P. Brozek, 'The Effects of Harmonics on Overcurrent Protection Devices,' Proc. 1990 IAS, 1990, pp. 1965- 1967
2 Aaron Reynose of Solidone Corporation 'Use of electronics for over-current protection' August 26, 2003
3 KSC 8321 : 배선용 차단기(2002)
4 KSC/IEC 60947-2 : 저전압 개폐 장치 및 제어장치- 제2 부 : 차단기. - 부속서 F(규정) : 전자식 과전류 보호 차단기에 대한 추가 요구사항. - 부속서 J(참고) : 전자기 호환성(EMC)-차단기에 대한 요구사항 및 실험방법
5 IEEE Std 141-1993, 'IEEE Recommended Practice for Electric Power Distribution for Industrial Plants'