Zone selective interlock module for use with static trip circuit

Details Zone selective interlock module for use with static trip circuit Zone selective interlock module for use with static trip circuit

1982-11-01

1984-08-28

Goldberg, E. A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 66, 34082502, 34082506, 324424, H02H 300, H02H 700, H02H 320, G01R 2700

Patent

active

044687141

ABSTRACT:
A zone selective interlock module is interposed between a pair of upstream and downstream static trip circuit breakers for controlling the short-time and ground fault zone selective interlock functions of the breakers. When a signal is received from a downstream static trip breaker, the module transmits a low-level interlock signal to a static trip breaker upstream. The interlock signal, in turn, activates the programmer circuit of the upstream breaker causing a shift in the upstream programmer time delay characteristics. The module also provides an energy storage feature to ensure the integrity of the interlock function in the event that the control power is lost upon the occurrence of a fault.

REFERENCES:
patent: 3070728 (1962-12-01), Edmunds
patent: 3383562 (1968-05-01), Fuller et al.
patent: 3686531 (1972-08-01), Decker et al.

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