Bridge circuits for sensing currents in a three-phase A.C. circu

Details Bridge circuits for sensing currents in a three-phase A.C. circu Bridge circuits for sensing currents in a three-phase A.C. circu

1977-03-24

1978-12-26

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, H02H 308

Patent

active

041319290

ABSTRACT:
A bridge circuit including an eight-leg full wave rectifier bridge connected to rectify the phase and neutral currents produced by three wye-connected current transformers magnetically coupled to respective phases of a three-phase electric power circuit, and used with one or more resistive elements to provide instantaneous D.C. voltage outputs at least once every current cycle, proportional to the highest and/or lowest peak phase current and to the peak neutral or ground current of the power circuit, for operating or preventing the operation of a circuit interrupter in the power circuit being measured.

REFERENCES:
patent: 3345539 (1967-10-01), Ashenden et al.
patent: 3689801 (1972-09-01), Engel et al.
patent: 3974423 (1976-08-01), Ulyanitsky et al.
patent: 4060844 (1977-11-01), Davis et al.

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