Circuit breaker reactive to three time-overcurrent characteristi

Details Circuit breaker reactive to three time-overcurrent characteristi Circuit breaker reactive to three time-overcurrent characteristi

1987-07-27

1989-03-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 361 94, 361 87, H02H 334, H02H 3093

Patent

active

048149357

ABSTRACT:
A circuit breaker having three level discriminating circuits and time-current operating circuits, respectively corresponding to an instantaneous releasing, a short time characteristic releasing and a long time characteristic releasing of disconnectable contacts.

REFERENCES:
patent: 3440491 (1969-04-01), Tenenbaum et al.
patent: 3633073 (1972-01-01), Day et al.
patent: 3786311 (1974-01-01), Hobson, Jr. et al.
patent: 3846675 (1974-11-01), Shimp
patent: 4246623 (1981-01-01), Sun
patent: 4377836 (1983-03-01), Elms et al.
patent: 4694373 (1987-09-01), Demeyer
E. Schweitzer and A. Aliaga, "Digital Programmable Time-Parameter Relay Offers Versatility and Accuracy", IEEE Transactions on Power Apparatus and Systems, vol. PAS-99, No. 1 (Jan./Feb. 1980).

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