Multiple range inverse time overcurrent relay

Details Multiple range inverse time overcurrent relay Multiple range inverse time overcurrent relay

1979-01-11

1980-08-26

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361103, H02H 308

Patent

active

042198593

ABSTRACT:
A relay for tripping a circuit breaker in a high voltage power line, the relay including a current transformer having first and second turns ratios, a heat radiation circuit including a plurality of lamps connected to the current transformer and a sensing circuit including a phototransistor which responds to heat radiation from one of said lamps, the turns ratios and lamps being selectively connectable to provide different minimum trip current levels of the relay.

REFERENCES:
patent: 4054934 (1977-10-01), Riebs
patent: 4156262 (1979-05-01), Eller et al.

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