No.9（2014）3.Lightning impulse withstand current capability evaluation method for SPD disconnector

Taiju Kurosawa

  An SPD (Surge protective device) is used for lightning protection for low voltage power supply circuit. The MOV (Metal oxide varistor) is used for a standard power supply SPD . MOV may fail due to the short circuit caused by the deteroration due to the repeated surge. In order to protect power supply from the SPD failure, the installation of the device such as a fuse or a circuit breaker required for disconnecting the SPD from the power system is defined in the Japanese Industrial Standards JIS C5381-11:2014 and -12:2014⁽¹⁾⁽²⁾. With regard to the fuse used as a SPD disconnector, the standard of Japan Electronics and Information Technology Industries Association was established JEITA RC-4501 and RC-4502 in December, 2013. However, there is no specific selection and test methods at present for the circuit breakers used as an SPD disconnector.
  In this study, a verification has been made on the behaviors and damages of the circuit breaker caused by the lightning impulse current, for developing an evaluation method of the lightning impulse withstand current capability for the breakers for wiring used as a SPD disconnector.
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Keywords
Lightning impulse current, SPD disconnector, MCCB, JIS C5381, SPD

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