Apparatus for fault direction-comparison protection

Details Apparatus for fault direction-comparison protection Apparatus for fault direction-comparison protection

H - Electricity

02

H

324/58.4

H02H 3/18 (2006.01) G01R 31/08 (2006.01) H02H 3/38 (2006.01) H02H 7/26 (2006.01) H04B 3/46 (2006.01)

Patent

CA 1139371

6506 INVENTORS: IVAN DE MESMAEKER and PETER M?LLER CAN INVENTION: APPARATUS FOR FAULT DIRECTION-COMPARISON PROTECTION ABSTRACT OF THE DISCLOSURE With heretofore known directional comparison protection systems working with fault direction detectors at both ends of a line section which is to be protected and data transmission between both end stations as well as trans- mitters and receivers and comparison-evaluation devices for narrowing or sectionalizing the location of the fault site with resepct to the line section to be protected, the reliability of such sectionalizing procedure, especially in the case of faults near to an end station, when working with series capac- itors or capacitance, is dependent upon the response of the protective gap of such capacitors. With non-response there are produced transient oscillations which can falsify the dir- ectional determination. The invention solves this problem by using distance protective relays as the fault direction detectors with line replica or image impedance, which can be switched in the sense of a zone staggering protection. The image im- pedance for the directional comparison protection is set greater than the impedance of the line section to be protected, prefer- ably is approximately equal to the forward network impedance of the relevant station.

342516

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