Solid state inverse overcurrent relay

Details Solid state inverse overcurrent relay Solid state inverse overcurrent relay

H - Electricity

02

H

348/26

H02H 3/08 (2006.01) H02H 1/00 (2006.01) H02H 3/093 (2006.01)

Patent

CA 1089073

SOLID STATE INVERSE OVERCURRENT RELAY Abstract of the Disclosure A solid state inverse overcurrent relay having a long slender wire connected to respond to a current which is proportional to the line current in a power system. An infra- red detector or phototransistor is positioned to sense a predetermined color of radiation from the wire and is connected to fire a silicon controlled rectifier which is connected in series with a trip coil for a circuit breaker. The trip coil and silicon controlled rectifier connected to an independent DC power source. The long slender wire on energization responds to the current which is proportional line current with the same time current characteristic as a fuse. In an alternate embodiment of the invention the relay is connected to the power system through a bridge rectifier which provides the DC current for operating both the heat responsive wire as well as the infrared detector.

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