DYNAMICALLY DISCONNECTED SINGLE-PHASE AC CIRCUIT BREAKER Russian patent published in 2000 - IPC

FIELD: circuit-opening devices for ac tractive equipment of electrified railways. SUBSTANCE: circuit breaker has current sensor 10 whose input is connected to movable contact of vacuum arc-control device 3; terminal leads of current sensor 10 are connected to input of rectifier unit 11 whose output is connected to mean-current storage unit 12; output of the latter is connected to coil of circuit breaker 6; polarity of signal is same as that of circuit-breaker OFF-signal coming from circuit-breaker control unit. EFFECT: fast response to overload and short-circuit currents; provision for dynamic disconnection of load current depending on its magnitude. 4 dwg