Coordination arrangment for protective devices in electrical sys

Details Coordination arrangment for protective devices in electrical sys Coordination arrangment for protective devices in electrical sys

1992-09-18

1995-03-28

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 67, 361 62, H02H 300

Patent

active

054022991

ABSTRACT:
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.

REFERENCES:
patent: 4571658 (1986-02-01), Ruta
patent: 4605982 (1986-08-01), Horner et al.
Photo Sheet 441-700 dated Apr. 30, 1984, S&C Electric Company.

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