Ratio ground relays

Details Ratio ground relays Ratio ground relays

1981-03-20

1982-11-02

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

361 77, 361 85, H02H 326

Patent

active

043576443

ABSTRACT:
Ratio ground induction disc relays for detecting open phases and phase-to-ground faults. An operating torque is applied to the induction disc which varies as a function of the zero sequence current. The phase currents are utilized in different arrangements to provide a restraining torque which varies as a function of predetermined different parameters, such as the sum of certain phase currents, the positive sequence current, or the positive sequence current minus the negative sequence current.

REFERENCES:
patent: 1702454 (1929-02-01), Todd
patent: 1883839 (1932-10-01), Webb
patent: 3172012 (1965-03-01), Gafford
patent: 4297740 (1981-10-01), Hagberg
Pages 1190-1200 IEEE Transactions on Power Apparatus and Systems, vol. PAS-90, No. 3, May/Jun. 1971.
Instruction Leaflet 41-1107 A K CW A.
Innovative Relay Methods for Detecting High Impedance Faults on Distribution Circuits--American Power Conf. Apr. 23-26, 1979, L. A. Kilar et al.
Improved Relay Schemes for Detection of Fallen Conductors on 30, Four Wire, Dist. Ckts., Kilar, Rosado, Shankle and Lee.
Summary and Status Report on Research To Detect and De-Energize High Imp. Faults on 30, Fourwire Dist. Ckts., Kilar and Lee.
It's Tough to Relay High-Impedance Faults, R. F. Wolff, Electrical World, Aug. 1, 1979, pp. 32, 33.

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