Phase selection for ground fault

Details Phase selection for ground fault Phase selection for ground fault

1993-02-23

1995-02-14

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 76, 361 65, 361 85, 324 86, 324108, H02H 326, H02H 340

Patent

active

053900677

ABSTRACT:
A method and a device for phase selection for single-pole tripping of high-impedance ground faults in direct grounded power networks. Starting from the ratio of the negative-sequence voltage to the zero-sequence current (U2/I0) and the ratio of the negative-sequence voltage to the positive-sequence voltage (U2/U1), two criteria with different conditions are formed, each of which indicating a faulted phase, and if both criteria indicate the same phase as faulted, single-pole tripping can take place.

REFERENCES:
patent: 4148087 (1979-04-01), Phadke
ASEA Relay Division; #RK556-300E; Nov. 1974; pp. 1-7.
ASEA Relay Division; #RK556-301E; Feb. 1979; pp. 1, 3, 5 & 7.
Ungrad et al.; Schutztechnik in Elektroenergiessystemen; p. 117. Jan. 1991.
GE Appl'n Guide, 1977; Sections 4-4.2.
BB Review 2-81; Progress in the Protection of Series-Compensated Lines and in the Determination of Very High Earth Fault Resistances; Baden; p. 102 and Appendix.
IEEE Proc., vol. 129, Pt. C, No. 3, May '82; Degenes; Micro-Processor-Implemented Digital Filters for the Calculation of Symmetrical Components; pp. 111-118.

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