Composite circuit breaker system

Details Composite circuit breaker system Composite circuit breaker system

1988-11-04

1989-10-24

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 63, H02H 308

Patent

active

048766259

ABSTRACT:
A composite circuit breaker includes a plurality of circuit breaker modules inserted in paralleled branches of the main conductor. The branch phase currents associated with each breaker module and a signal representative of the total currents in the main conductor are auctioneered to select the largest of the current for application to the trip circuit of the breaker to provide protection for the individual breakers against current hogging while composite protection is provided for the load/source. The signal representative of each phase of the total current is generated by a primary current transformer which feeds series connected auxiliary current transformers each of which is associated with one of the individual breakers.

REFERENCES:
patent: 3689801 (1972-09-01), Engel et al.
patent: 3852660 (1974-12-01), Maier et al.
patent: 3924160 (1975-12-01), Maier et al.
patent: 4439803 (1984-03-01), Baba
patent: 4476511 (1984-10-01), Saletta et al.
patent: 4541031 (1985-09-01), Ibbetson
Network Balancing Transformer, by R. E. Powers, The Electric Journal, Feb. 1932, pp. 89-92.

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