High speed, selective protective relays

Details High speed, selective protective relays High speed, selective protective relays

1999-01-21

2000-10-24

Ballato, Josie

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 94, 361 937, H02H 318

Patent

active

061376663

ABSTRACT:
A protective relay receives current and voltage inputs, digitizes them and reduces the effects of high and low frequency noise. In the case of a distance relay, incorporated in the relay is a signal generator which generates "operate" and "restraint" sinusoidal signals. In the case of a current or voltage relay, operate is a digitized version of current (voltage) and restraint is a pre-specified constant. In all cases, a magnitude comparator, implemented using short (two sample) data window algorithms, compares the magnitude of the operate and restraint signals and outputs a trip condition signal. The trip condition output is limited to a finite number of values by a limiter system and sent to an adaptive trip counter system. The adaptive trip counter system employs trip counter processing, which determines whether a trip signal will be initiated, immediately or after a period of delay.

REFERENCES:
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patent: 4825327 (1989-04-01), Alexander et al.
patent: 4868704 (1989-09-01), Cavero
patent: 4873602 (1989-10-01), Wilkinson
patent: 5453903 (1995-09-01), Chow
patent: 5576618 (1996-11-01), Calero
patent: 5659242 (1997-08-01), Calero

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