Protective relaying apparatus

Details Protective relaying apparatus Protective relaying apparatus

1979-02-05

1981-10-27

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 82, 361 84, H02H 328

Patent

active

042977401

ABSTRACT:
A protective relaying system for detecting and clearing high impedance faults on a polyphase electrical distribution circuit. First and second ratio ground relays are located at first and second circuit breakers, respectively. The first circuit breaker is located at the substation, and the second circuit breaker is remote from the substation, usually operating with a reclosing relay. A zero sequence directional relay, located at the second circuit breaker, coordinates the ratio ground relays by adjusting the trip delay time of the second circuit breaker according to the flow direction of a zero sequence quantity at the second circuit breaker.

REFERENCES:
patent: 2516025 (1950-07-01), Sunnemann
patent: 3673425 (1972-06-01), Plichta
"Operational Amplifier Circuits for Relay Applications" by R. W. Gonnam, May 22, 1975, Westinghouse.
"Low Burden Sensing Units for Directional Comparison Systems" by Hinman et al., Apr. 12, 1976, Westinghouse.
IEEE Transactions on Power Apparatus and Systems, vol. PAS-90, No. 3, May/Jun. 1971, pp. 1190-1200.
Westinghouse Instruction Leaflet 41-1107 Akcwa "Type Sig-1H, Positive Sequence Restrained Ground Overcurrent Relay."

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