Practical Problems on SF6 Gas Circuit Breakers

The SF6 gas circuit breaker is getting a major position in the field of circuit breakers because of its excellent performance. On the way to putting them to practical use the authors made investigations to solve the several problems encountered, such as the control of moisture content in the gas, liquefaction, control of gas leakage, selection of O-ring materials, etc. This paper describes the results of these investigations and presents the solutions and counter- measures applied in practice.