| 摘要 |
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- 1 distance 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- 1 distance relay element in terms of data time length which is shorter than that used for the computation of the zone- 1 distance relay element, and a logic element which outputs a relay signal in accordance with a detecting operation of the zone- 1 distance relay element, the fault detecting relay element, and the directional relay element.
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