Fay, Sharpe, Beall, Fagan, Minnich & McKee
Gas insulated switchgear insertion resistor and main contacts operating mechanism having time delay feature
 A gas circuit breaker having a resistance circuit breaking portion connected in parallel with a main circuit breaking portion includes a main circuit breaking portion actuating mechanism and a resistance circuit breaking portion actuating mechanism. The resistance circuit breaking portion actuating mechanism is provided with a first delaying mechanism mechanically coupled to the main circuit breaking portion actuating mechanism, and a second delaying mechanism, independent from the first delaying mechanism, which is operated by an electrical command signal relating to either a making or an interrupting electrical signal to the main circuit breaking portion actuating mechanism. The otherwise possible thermal break-down of a resistor connected in series with the resistance circuit breaking portion is prevented. 
Hitachi, Ltd.
H H
H01H H01H
inventional additional
Hideo Masatomo Hitoshi Manabu
Kawamoto Ohno Yamada Takamoto