Phase relay for AC power transmission line protection

Details Phase relay for AC power transmission line protection Phase relay for AC power transmission line protection

1982-07-29

1983-12-13

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 80, 361 67, H02H 326, H02H 726

Patent

active

044207883

ABSTRACT:
A phase relay utilizes improved polarizing and operating signals in order to provide discrimination between internal faults within a protected zone of an AC power transmission line and external faults than can appear as internal faults due to transients induced by capacitive voltage transformers or series capacitors. A zero sequence restraint signal is used to block operation of the phase relay on close-in single line to ground faults. A filter is used in a by-pass circuit to attenuate high frequency transients which might delay, and possibly prevent a trip output on an internal fault. A high set by-pass circuit, including zero suppression to preclude an output on an external fault, is employed to provide faster operating times on severe internal faults. Forward offset and/or zero suppression of the polarizing signal is used to reduce the characteristic timer setting and therefore increase the speed of the phase relay operation.

REFERENCES:
patent: 3374399 (1968-03-01), Dewey
patent: 3992651 (1976-11-01), Hodges
patent: 4034269 (1977-07-01), Wilkinson
patent: 4148087 (1979-04-01), Phadke
patent: 4161011 (1979-07-01), Wilkinson
patent: 4222085 (1980-09-01), Mesmaeker
patent: 4296451 (1981-10-01), Wilkinson
patent: 4342062 (1982-07-01), Hodges
Paper by S. B. Wilkinson and C. A. Mathews, "Dynamic Characteristics of MHO Distance Relays", presented to Pennsylvania Electric Assn. Relay Committee, Winter Meeting, Philadelphia, Pa., Feb. 22, 1979.

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