Journal of Electrical Engineering and Technology

  • 제12권3호
  • /
  • Pages.1257-1261
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  • 2017
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  • 1975-0102(pISSN)
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  • 2093-7423(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
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Simple Analysis Method for the Interrupting Capability of a Contact System in a Molded Case Circuit Breaker

  • 투고 : 2016.07.20
  • 심사 : 2017.02.20
  • 발행 : 2017.05.01
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초록

This paper focuses on understanding the interrupting capability of an arc contact system in a molded case circuit breaker (hereafter MCCB). We selected four types of MCCBs and analyzed the magnetic flux density distributions in the contact systems caused by the fault currents. We ascertained that the magnetic flux density profile varies according to the shape of the contact system and was asymmetric at both the ends of an arc, perpendicular to the arc column because of the magnetic grid installed in the contact system. The asymmetric difference creates a magnetic force that pushes the arc current outwards and provides an interrupting capability. We have introduced a simple analysis method for determining the interrupting capability of the contact system for an MCCB by the arc-driving magnetic flux density.

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참고문헌

  1. Jong-Suk Ro, Hyeon-Jeong Bak, Hyun-Kyo Jung, "Characteristic Analysis and Design of a Novel Lorentz Force Driving Actuator for a Molded Case Circuit Breaker," IET Electr. Power Appl., Vol. 9, Iss.1, pp. 1-9, 2015. https://doi.org/10.1049/iet-epa.2013.0314
  2. Li, X., Chen, D., Wang, Y., Wang, Q., Geng, Y., "Analysis of the Interruption Process of Molded Case Circuit Breakers," IEEE Trans. Compon. Packag. Technol., vol. 30, no. 3, pp. 375-382, Sep. 2007. https://doi.org/10.1109/TCAPT.2007.900051
  3. John J. Shea, Xin Zhou, "Contact Material and Arc Current Effect on Post-Current Zero Contact Surface Temperature," IEEE Trans. Components and Packaging Technologies, vol. 29, no. 2, pp. 286-293, Jun. 2006. https://doi.org/10.1109/TCAPT.2006.875881
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  5. Mitsugu Takahashi, Takao Mitsuhashi, Yuuichi Wada, Sinji Yamagata, "Building up the Arc Driving Magnetic Flux in the Contact System of MCCB," SP-95-56 Published by Japanese Institute of Electrical Engineers, pp. 171-180, 1995.
  6. Special Issue, "New Circuit Breakers & Earth Leakage Circuit Breakers," Mitsubishi Denki Giho, vol. 69, no. 4, 1995.
  7. Special Issue, "New MCCB, ELCB," Fuji Electric Journal, pp. 124-177, 1990.