1974-11-01
1976-08-10
Miller, J D
317 27R, H02H 300
Patent
active
039744230
ABSTRACT:
A differential current protective device comprising a responsive unit, current transformers feeding a polyphase bridge rectifier, a single-phase bridge rectifier connected to the secondary of a differential transformer, a circuit including two resistors connected across the responsive unit, one of said resistors being connected to the single-phase bridge rectifier pole terminals and the other to the polyphase bridge rectifier pole terminals, and a single half-bridge.
The device is distinguished from the prior art in that the single half-bridge is connected in a parallel opposed relationship to the polyphase bridge rectifier via a resistor of equal resistance in each arm.
REFERENCES:
patent: 3573552 (1971-04-01), Forfod
Belichenko Vladimir Ivanovich
Mikhailov Vladimir Vladimirovich
Streltsov Vladimir Semenovich
Ulyanitsky Evgeny Mefodievich
Miller J D
Moose Jr. Harry E.
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