Ground distance relay employing phase comparator measurement

Details Ground distance relay employing phase comparator measurement Ground distance relay employing phase comparator measurement

1978-02-21

1979-07-10

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 85, 324 83Q, H02H 326, H02H 726

Patent

active

041610113

ABSTRACT:
A ground distance relay employing phase angle comparator measurement is provided with additional input signals. In one embodiment, a two input ground distance relay is provided with two additional input signals. In this embodiment, the first two input signals comprise an OPERATE SIGNAL of the form IZ-V and a POLARIZING SIGNAL of quadrature shifted form. The third input signal comprises a #2 POLARIZING SIGNAL which is related to the zero sequence voltage at the relay. The fourth input signal comprises a CURRENT SUPERVISION SIGNAL which is related to the zero sequence current at the relay. These four input signals are directed to coincidence and timer circuitry. The presence of these four inputs provides improved relay security against undesirable relay operation for several existing problems. For example, additional security is provided for situations in which a single line to ground fault occurs at or just beyond the relay balance point where fault resistance may cause undesirable relay operation. Also, additional security is provided for situations in which double line to ground faults occur. Other embodiments are disclosed.

REFERENCES:
patent: 3374399 (1968-03-01), Dewey
patent: 3626281 (1971-12-01), Souillard
patent: 3898530 (1975-08-01), Perez-Cavero
patent: 4034269 (1977-07-01), Wilkinson
patent: 4091433 (1978-05-01), Wilkinson

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