초록

A short circuit protection system is disclosed in which a trip-free circuit breaker is combined with at least one current limiting fuse whereby to provide full range short circuit clearing capacity in voltage ranges in which full range fuses are not available or economical.

대표청구항 ▼

A short circuit protection system for a high voltage alternating current distribution system, comprising: current limiting fuse means adapted to be connected in circuit in a high voltage power line extending between said high voltage alternating current distribution system and a source of high volta

A short circuit protection system for a high voltage alternating current distribution system, comprising: current limiting fuse means adapted to be connected in circuit in a high voltage power line extending between said high voltage alternating current distribution system and a source of high voltage alternating current power; vacuum circuit breaker means, including solenoid-operated tripping means, adapted to be connected in series with said current limiting fuse means between said distribution system and said source of power; overload current detecting means for detecting fault currents in said distribution system and providing a tripping signal to trip said vacuum circuit breaker means; winding means inductively coupled to at least one conductor of said power line and insulated from said power line; rectifying means for rectifying an alternating current voltage derived from said winding means and producing a unidirectional current; electrical energy storage means for storing electrical energy derived from said uni-directional current; and circuit means for energizing the solenoid means of said solenoid-operated tripping means from said electrical energy storage means under the control of said overload current detecting means.