Load selectivity system for use with electronic trip circuit bre

Details Load selectivity system for use with electronic trip circuit bre Load selectivity system for use with electronic trip circuit bre

1998-06-01

1999-05-18

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 68, 361 94, 361102, 307 39, H02H3/00

Patent

active

059056169

ABSTRACT:
A circuit breaker interconnect arrangement and a method for selective interruption of electrical circuits includes at least one upstream circuit breaker having an upstream electronic trip unit and a microprocessor and a plurality of downstream circuit breakers connected to the upstream circuit breaker. The microprocessor transmits a trip command signal to the downstream electronic trip units at the occurrence of a predetermined load condition, such as an overload condition, through the upstream circuit. One or more downstream circuit breakers are tripped after the predetermined time delay for tripping according to a predetermined priority until the load condition through the upstream circuit is reduced below the predetermined load condition whereby the upstream circuit breaker is deterred from interrupting current in the upstream circuit. In one embodiment of the present invention, at the occurrence of the overload condition through the upstream circuit, a determination is made as to whether the overload condition through the upstream circuit is due to an overload condition through one or more of the downstream circuits wherein the corresponding downstream circuit breakers are tripped. In another embodiment of the present invention, the downstream circuits are designated as critical or sheddable. At the occurrence of a predetermined load condition through the upstream circuit, the microprocessor transmits the trip command signal to the sheddable downstream circuit breakers first according to a predetermined priority.

REFERENCES:
patent: 4321681 (1982-03-01), Sackin et al.
patent: 4468714 (1984-08-01), Russell
patent: 5151842 (1992-09-01), DeBiasi et al.
patent: 5414640 (1995-05-01), Seem
patent: 5734576 (1998-03-01), Klancher

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