Power system switch incorporating a positive-sequence fundamenta

Details Power system switch incorporating a positive-sequence fundamenta Power system switch incorporating a positive-sequence fundamenta

1995-08-22

1997-06-24

Martin, David S.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 307105, 361 76, 361 80, 361 81, 363 1, 363 39, 327555, H02M 112

Patent

active

056420030

ABSTRACT:
A power switching apparatus includes a positive-sequence fundamental signal magnitude detector. The positive-sequence fundamental signal magnitude detector derives a positive-sequence fundamental signal from a three-phase voltage signal carried by a power line; it also generates a switch firing command when the positive-sequence fundamental signal exceeds a predetermined threshold value indicative of a fault condition on the power line. The power switching apparatus also includes a solid state switch connected to the power line and the positive-sequence fundamental signal magnitude detector. The solid state switch bloch power on the power line in response to the switch firing command.

REFERENCES:
patent: Re30134 (1979-10-01), McClain et al.
patent: 4210948 (1980-07-01), Waltz
patent: 4811236 (1989-03-01), Brennen et al.
patent: 5166887 (1992-11-01), Farrington et al.
patent: 5367426 (1994-11-01), Schweitzer, III
patent: 5384696 (1995-01-01), Moran et al.
patent: 5513090 (1996-04-01), Bhattacharya et al.

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