Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Patent
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.
Jennings Derek S.
Pellinen A. D.
The Electricity Council
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