Factors Influencing the Interrupting Ability of SF6 Puffer Breaker and Development of 300kV-50kA One-Break Circuit Breaker

The factors to be considered at the design stage of the extinction chamber of a SF6 puffer gas circuit breaker (GCB) have been examined numerically and analytically. It has been shown that an extinction chamber which satisfies both Short Line Fault (SLF) and Breaker Terminal Fault (BTF) conditions simultaneously is not economical and a capacitor parallel to it should be used. On the basis of the above analysis, a 300kV-5OkA one-break chamber has been developed successfully.