Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1981-03-06
1982-07-27
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 85, H02H 326, H02H 726
Patent
active
043420648
ABSTRACT:
A distance protective relay employing phase angle comparator measurement is provided with an improved polarizing signal. In one embodiment, a phase distance relay is provided with a two-component polarizing signal which includes one component representative of a faulted transmission line voltage and a second component representative of the product of a predetermined constant and the positive sequence component of the faulted transmission line voltage. One preferred polarizing signal for a phase AB phase distance relay is V.sub.POL =V.sub.AB +KV.sub.AB1, where K is approximately 0.3. Such a polarizing signal results in improved relay operation under certain fault conditions, especially under steady state conditions. In another embodiment, a ground distance relay is provided with a two-component polarizing signal. For, example, one preferred polarizing signal for a phase A ground distance relay is V.sub.POL =V.sub.A +KV.sub.AJ, where K is approximately 0.3. 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
patent: 4092690 (1978-05-01), Wilkinson
patent: 4148087 (1979-04-01), Phadke
patent: 4161011 (1979-07-01), Wilkinson
S. B. Wilkinson et al., "Dynamic Characteristics of MHO Distance Relays," present to Pennsylvania Electric Association Relay Committee Winter Meeting, Philadelphia, Pa. Feb. 22-23, 1979.
Freedman William
General Electric Company
McMahon John P.
Salce Patrick R.
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