H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 3/08 (2006.01) H02H 3/44 (2006.01) H02H 7/26 (2006.01) H02H 7/30 (2006.01) H02H 3/093 (2006.01)
Patent
CA 2080673
An arrangement to coordinate protective devices is provided by defining operation of the instantaneous characteristic portion of an upstream protective device to coordinate with a downstream current-limiting fuse based on the peak let-through current of the downstream current-limiting device, with instantaneous operation being set to occur only above the peak let-through current of the downstream current-limiting fuse. Accordingly, for fault currents which are seen by both the instantaneous device and the current-limiting device and that are within the ratings of the current-limiting device, the upstream device will not respond and the downstream current-limiting fuse will interrupt the fault, as intended.
Osler Hoskin & Harcourt Llp
S&c Electric Company
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