System for detection of transients from a coupling capacitor vol

Details System for detection of transients from a coupling capacitor vol System for detection of transients from a coupling capacitor vol

1995-10-20

1997-12-30

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 80, H02H 338

Patent

active

057037450

ABSTRACT:
The voltage and current conditions on a power transmission line are monitored to determine the coincidence of a low voltage condition and a lack of a high current condition. The coincidence of those two conditions is indicative of a CCVT transient, and the tripping action from zone 1 distance elements is delayed for a period of 1.375 cycles. The tripping delay is supervised by a fault impedance determination, which, if a threshold is exceeded, the remaining portion of the time delay is eliminated, so that a trip is allowed if the time delay period has not expired.

REFERENCES:
patent: 4821137 (1989-04-01), Wilkinson
patent: 5349490 (1994-09-01), Roberts et al.
Electric Machinery, A.E. Fitzerald et al., 4th edition, 1983, McGraw-Hill Book Company, USA, pp. 499-500, 528-530, 1983.

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