Loss of potential determination for use in protective relays for

Details Loss of potential determination for use in protective relays for Loss of potential determination for use in protective relays for

1996-07-26

1999-03-16

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

307125, 361 58, 361 59, 361 76, 361 79, 361 85, G08B 2100

Patent

active

058835784

ABSTRACT:
The positive sequence voltage on the power line is measured at a given time, i.e. the present time, and also for one cycle earlier, and the ratio thereof is then compared against a threshold value of 0.9. There are four other supervisory tests which also must be true for a loss of potential condition to be indicated. These include determination of change in positive sequence current and angle and zero sequence current and angle. If the change in those values is smaller than selected thresholds, then a loss of potential condition is indicated.

REFERENCES:
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patent: 4210948 (1980-07-01), Waltz
patent: 4366474 (1982-12-01), Loewenstein
patent: 4795983 (1989-01-01), Crockett et al.
patent: 5041737 (1991-08-01), Schweitzer, III et al.
patent: 5300924 (1994-04-01), McEachern et al.
patent: 5642249 (1997-06-01), Kuznetsov

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