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A Study on the Analysis of Heat and Metallurgical Structure of Connection Parts for Residual Current Protective Devices  

Choi Chung-Seog (전기안전연구원)
Shong Kil-Mok (전기안전연구원)
Kim Dong-Ook (전기안전연구원)
Kim Dong-Woo (전기안전연구원)
Kim Young-Seok (전기안전연구원)
Publication Information
Fire Science and Engineering / v.18, no.4, 2004 , pp. 57-63 More about this Journal
Abstract
We investigated heat properties of connection terminal in residual current protective devices(RCD) according to contact pressure for low voltage appliance. And we analyzed voltage and current waveform and oxide propagation when the poor-contact happened between terminal and wire. When contact pressure between terminal and connection wire was not applied, the heat was generated and an oxide was formed on the surface of the wire. The temperature of the insulation surrounding terminal was ascended sharply by poor-contact, micro-sparks and continuous arc sound happened in interior terminal. When the poor-contact by vibration occurred inner conductor of terminal and wire, an oxide was propagated on contact surface and the temperature was increased at 869℃. Thus, we found that the risk of electrical disaster is high in terminal and connection wire parts.
Keywords
Terminal; Poor-contact; Heat; Oxidation propagation;
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