Electricity: electrical systems and devices – Safety and protection of systems and devices – With phase sequence network analyzer
Patent
1981-03-20
1982-08-31
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
043475426
ABSTRACT:
A ratio ground induction disc 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 the positive sequence current I.sub.1 minus the negative sequence current I.sub.2. The restraint quantity is provided by an electromagnetic having first and second outer legs and an inner leg. Electrical windings are disposed on only the first and second outer legs, arranged and energized by the three phase currents to provide equal length flux paths, and thus equal torques, regardless of the faulted phase.
REFERENCES:
patent: 1702454 (1929-02-01), Todd
patent: 4297740 (1981-10-01), Hagberg
Summary and Status Report on Research to Detect and De-Energize High Imp. Faults on 3.phi., 4 Wire, Dist. CKTS; Kilar and Lee.
It's Tough to Relay High-Imp. Faults, Wolff, Electrical World, Aug. 1, 1979; pp. 32, 33.
pp. 1190-1200, IEEE Transactions on Power Apparatus and Systems, vol. PAS-90, No. 3, May/Jun. 1971.
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., Wire, Dist. CKTS, Kilar, Rosado, Shankle & Lee.
Eisenzopf Reinhard J.
Lackey D. R.
Westinghouse Electric Corp.
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