H - Electricity – 02 – G
Patent
H - Electricity
02
G
H02G 1/00 (2006.01) H02H 7/26 (2006.01) H02H 11/00 (2006.01)
Patent
CA 2413525
Protection is provided for servicing a distribution bus by grounding the line side of a circuit breaker through which the distribution bus is fed and then closing the circuit breaker. The trip unit of the circuit breaker includes logic, in addition to the normal protection logic, which opens the circuit breaker main contacts without delay if current is detected upon closing of the grounded circuit breaker. However, if the grounded circuit breaker has been closed for a selected period of time and then current is detected, the distribution bus is kept at zero potential by not operating the breaker. A breaker auxiliary switch with a mechanical delay provides the indication of the selected time interval after closing the circuit breaker.
Davies Norman
Johnson Richard Arthur
Lagree James L.
Marchand Francois J.
Matsko Joseph Jacob
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Corporation Eaton
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