Apparatus for providing distance protection and distance measure

Details Apparatus for providing distance protection and distance measure Apparatus for providing distance protection and distance measure

1988-11-14

1989-09-19

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 63, 361 65, 361 78, 324522, 364483, H02H 316

Patent

active

048687049

ABSTRACT:
a protective relay for detecting faults in electrical power distribution system generates a signal .DELTA.i(t) which is substantially equal to the magnitude of the power distribution system current i measured at a first time subtracted from the magnitude of the power distribution system current i measured at a second time, the second time occurring later than the first time. The signal .DELTA.i(t) is utilized to generate measurement of the distance of a fault to the relay and is also utilized to generate operate signals if the fault occurs within the zone protected by the relay.

REFERENCES:
patent: 4034269 (1977-07-01), Wilkinson
patent: 4293886 (1981-10-01), Church et al.
patent: 4405966 (1983-09-01), Cavero
patent: 4420788 (1983-12-01), Wilkinson et al.
patent: 4686601 (1987-08-01), Alexander et al.

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