In this paper,the core components of the main hoist GJH1-200/6 high-voltage vacuum commutator in the course of day-to-day work of the failure to carry out an analysis,summarize the main reason for failure and improve,using non-contact point contact,instead of contact point,to avoid contact with the occurrence of faults,fully improved production efficiency.

In view of the problems for high voltage vacuum contactor in use,the solution methods are proposed.

According to production practice in Angang Steel Works and the comparisen be-tween oil switch , vacuum circuit breaker with high voltage vacuum contactor, the high voltage vacuum contactor was selected which makes production running smoothly and failure rate reduct-ed,thus it is a best way to make profits through reducing consumption in metallurgical enterpris-es.

The research and application of HV vacuum circuit breaker in past 40 forty years has been reviewed in this paper.

This paper introduces the HV explosion-proof switch in coalmine power-supply system,analyzes the advantages/disadvantages and performances of the HV vacuum circuit breakers with spring actuator,electromagnetic actuator and permanent magnetic actuator,and analyzes the social and economic benefits of HV vacuum circuit breaker with permanent magnetic actuator.

The electric insulation was extraordinary important for a high-voltage vacuum apparatus.

Development of pulsed aging test bench for high-voltage vacuum devices;