Distance relay apparatus

Details Distance relay apparatus Distance relay apparatus

2007-06-19

2007-06-19

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

C361S094000, C702S059000

Reexamination Certificate

active

10614832

ABSTRACT:
A distance relay apparatus includes a directional relay element which performs computation to detect a fault, which occurs in the forward direction from an installing point of the relay apparatus, based on a voltage and a current which are received from an object to be protected, a zone-1distance relay element which performs computation to detect a fault within a predetermined zone, a fault detecting relay element which performs computation to detect a fault within a zone that is narrower than that of the zone-1distance relay element in terms of data time length which is shorter than that used for the computation of the zone-1distance relay element, and a logic element which outputs a relay signal in accordance with a detecting operation of the zone-1distance relay element, the fault detecting relay element, and the directional relay element.

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patent: 4774621 (1988-09-01), Andow
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patent: 3-270634 (1991-12-01), None
Protection Relay, IEEJ, pp. 110-115.
IEEJ Technical Report No. 641, Jul. 1997, pp. 83-87.

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