Strength Verification Calculation of the Explosion-Proof Vacuum Circuit Breaker Enclosure THCDPN-660 (1140) for Underground Coal Mines

Abstract

In the design of electrical equipment intended for use in underground coal mines where explosive gas and dust atmospheres may be present, the flameproof enclosure plays a critical role. The enclosure shall comply with all applicable requirements of type of protection “d” (flameproof enclosure) in accordance with IEC 60079 and the corresponding Vietnamese standard TCVN 7079. Therefore, the design process requires conformity with enclosure construction requirements in combination with mechanical strength verification calculations.

This paper presents the technical requirements for the flameproof enclosure of a vacuum switch, together with the methodology and results of strength verification performed during the design stage. The research methods, design procedure, and results presented in this paper can be generally applied to the design of flameproof enclosures for electrical equipment intended for use in underground coal mines.