Remote protection of three phase distribution transformers

Details Remote protection of three phase distribution transformers Remote protection of three phase distribution transformers

1987-09-17

1988-05-17

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 65, 361 76, 361 80, 361 83, 361 85, 364483, H02H 7045

Patent

active

047455128

ABSTRACT:
It is desirable to provide remote digital protection of distribution transformers. This specification discloses a protection system able to measure and compare increases in both negative and positive phase reference currents on a distribution cable feeding a transformer and to trigger a circuit breaker to isolate the cable only if the negative sequence current increase exceeds a predetermined proportion of any simultaneous positive sequence current increase. Consequently, engergizing with a 12.5% unbalance current has been found possible without false tripping.

REFERENCES:
patent: 4261038 (1981-04-01), Johns et al.
patent: 4293886 (1981-10-01), Church et al.
patent: 4405966 (1983-09-01), Cavero
patent: 4408246 (1983-10-01), Roy
patent: 4541058 (1985-09-01), Andow et al.
patent: 4669024 (1987-05-01), Stacey
patent: 4686601 (1987-08-01), Alexander et al.

Affiliated with

Also associated with

Rating

Remote protection of three phase distribution transformers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Remote protection of three phase distribution transformers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Remote protection of three phase distribution transformers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1885285