The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2007
Filed:
Jul. 09, 2003
Takahiro Kase, Tachikawa, JP;
Hidenari Amo, Fuchu, JP;
Tetsuo Matsushima, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
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-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-distance relay element in terms of data time length which is shorter than that used for the computation of the zone-distance relay element, and a logic element which outputs a relay signal in accordance with a detecting operation of the zone-distance relay element, the fault detecting relay element, and the directional relay element.