Overcurrent trip device

Details Overcurrent trip device Overcurrent trip device

H - Electricity

01

H

348/26

H01H 47/18 (2006.01) H02H 3/093 (2006.01)

Patent

CA 1036704

OVERCURRENT TRIP DEVICE ABSTRACT OF THE DISCLOSURE A static overcurrent trip device for sensing line and/or ground faults with improved timing circuits provided to operate a circuit breaker for protecting an electrical system in response to signals. The energy to operate the tripping device is obtained solely from the circuit being protected. Current transformers, one per phase, provide a signal to the static trip device proportional to the primary current. These are toroidal current transformers or hereinafter known as tripping transformers and establish the maximum continuous current rating of the breaker that it is associated with. The static trip device receives the signal from the tripping transformers, monitors the signal, senses overloads and faults, and determines the required action in accordance with preselected control settings. When the static trip device senses a circuit condition that requires the circuit breaker to open, it produces an output that is fed to the tripping actuator. The actuator then causes the circuit breaker contacts to open and isolate the circuit.

174968

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