Static overcurrent relay

Details Static overcurrent relay Static overcurrent relay

1974-09-27

1976-03-02

Miller, J. D.

317 33SC, 317 22, 317 13B, H02H 308, H02H 706

Patent

active

039420744

ABSTRACT:
A solid state protective device is disclosed which protects electrical apparatus from heat damage due to overcurrents, particularly one which protects electrical generators from damage caused by heat due to excessive negative phase sequence currents. The device includes a novel reset feature such that the time required for the device to take protective action after an overcurrent is detected is reduced by a period of time which is a linear function of the heat remaining in the protected apparatus due to any prior overcurrents.

REFERENCES:
patent: 2897407 (1959-07-01), Morris
patent: 3154737 (1964-10-01), Hodges
patent: 3317794 (1967-05-01), Kotheimer
patent: 3531689 (1970-09-01), Horn
patent: 3662220 (1972-05-01), Riebs
patent: 3808503 (1974-04-01), Hentschel
patent: 3849706 (1974-11-01), Johnson et al.
"Negative Sequence Current Protection - ", by Hossbo et al., pp. 197-198, Asea Journal, 1971, Vol. 44, No. 6.

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