Protective relay

Details Protective relay Protective relay

1981-03-20

1982-12-07

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 87, H02H 326

Patent

active

043630669

ABSTRACT:
A percent unbalance or ratio ground relay which detects open phase conductors on electrical distribution circuits, as well as single-phase-to-ground faults regardless of fault impedance, by providing an operating quantity responsive to zero sequence current, and a restraining quantity responsive to a pre-fault balanced phase current minus the zero sequence current. This restraint torque arrangement causes the relay to operate on true ratio unbalance, regardless of load.

REFERENCES:
patent: 1702454 (1929-02-01), Todd
patent: 4297740 (1981-10-01), Hagberg
IEEE Transactions on Power Apparatus and Systems, vol. PAS-90, No. 3, May/Jun. 1971, pp. 1190-1200.
Instruction Leaflet 41-1107A, K CW A.
Innovative Relay Methods for Det. High-Imp. Faults on Dist. Ckts., Amer. Power Conf., Apr. 23-26, 1979, L. A. Kilar et al.
Improved Relay Schemes for Det. of Fallen Conductors on 3.phi., 4 Wire Dist. Ckts., Kilar, Rosado, Shankle & Lee.
Summary and Status Report on Research to Det. and De-Energize High-Imp. Faults on 3.phi., 4 Wire Dist. Ckts., Kilar & Lee.

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