Protective relaying system comprising numerical comparator-based

Details Protective relaying system comprising numerical comparator-based Protective relaying system comprising numerical comparator-based

1995-12-18

1998-08-18

Kemper, Melanie

Boots, shoes, and leggings

364483, 361 78, H02H 300, G06F 1900

Patent

active

057966290

ABSTRACT:
Disclosed is a protective relaying system that trips a local circuit breaker (BL) connected to a transmission line by providing a trip signal ("TRIP.sub.-- BL") to the circuit breaker. The system comprises a local filter operatively coupled to the transmission line, and a local relay operatively coupled to the filter. The local filter receives inputs indicative of phase currents on the transmission line and provides an output ("VFL.sub.k ") derived from the inputs. The local relay (1) receives the output (VFL.sub.k) of the local filter, (2) receives an output ("VFR1.sub.k ", "VFR2.sub.k ") of at least one remote filter, and (3) generates the trip signal. The local filter and relay preferably employ substantially all digital electronic circuitry to generate the trip signal.

REFERENCES:
patent: 4208687 (1980-06-01), Sun et al.
patent: 4725914 (1988-02-01), Garity
patent: 4968960 (1990-11-01), Bouhenguel et al.
patent: 5576618 (1996-11-01), Calero

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