Electrical switching device or trip unit acquiring...

Details Electrical switching device or trip unit acquiring... Electrical switching device or trip unit acquiring...

H - Electricity

02

H

H02H 3/02 (2006.01) H02H 3/00 (2006.01) H02H 7/26 (2006.01)

Patent

CA 2271443

A first trip unit for interconnection with a second trip unit includes current transformers and potential transformers for sensing current, voltage and frequency conditions of a circuit breaker's separable contacts. A microprocessor-based trip mechanism provides a trip signal, which is employed by the circuit breaker's operating mechanism to open the separable contacts as a function of the sensed electrical conditions and related predetermined operating values. The microcomputer's transceiver communicates with the second trip unit over a passive two-wire communication cable to acquire the predetermined settings of the second trip unit. The microcomputer includes a firmware routine which employs the acquired predetermined settings as its predetermined values.

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