Ground fault signal circuit for circuit breaker trip unit

Details Ground fault signal circuit for circuit breaker trip unit Ground fault signal circuit for circuit breaker trip unit

1977-05-06

1978-10-17

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, 361 97, H02H 328

Patent

active

041212690

ABSTRACT:
Separate current transformers sense the individual currents flowing in each conductor of a distribution circuit. A full wave rectifying network includes a plurality of parallel pairs of like poled, series diodes connected between a pair of buses. One corresponding side of each transformer secondary is connected to the junction between a different diode pair. A series circuit consisting of an additional pair of like poled diodes and a burden resistor is also connected between the buses. The corresponding other sides of the transformer secondaries are connected in common to the junction between the additional diode pair. A voltage is developed across the burden resistor only upon the existence of an imbalance in the currents flowing in the distribution circuit.

REFERENCES:
patent: 3328638 (1967-06-01), Reis
patent: 3329870 (1967-07-01), DeViney et al.
patent: 3713005 (1973-01-01), Engel
patent: 3786311 (1974-01-01), Hobson, Jr. et al.
patent: 3959695 (1976-05-01), Shimp

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