Electrical switching device or trip unit acquiring predetermined

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

1998-05-11

1999-12-21

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 66, 361 68, H02H 300

Patent

active

060057572

ABSTRACT:
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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