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A New Strategy for Determining Fault Zones in Distance Relays

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3 Author(s)
Mahmoud Gilany ; Dept. of Electr. Eng., Coll. of Technol. Studies, Shuwaikh ; Ahmed Al-Kandari ; Jamal Madouh

A new strategy (denoted P-SS) for estimating the correct fault zone in distance relays is introduced. The main difference between the P-SS and conventional setting strategies is that the P-SS does not depend on fixed boundaries for backup zones. It depends on exchanging information between local relays in the same station in addition to a command from the remote end relay. With the proposed strategy, zone-1 covers the entire length of the protected line, zone-2 covers the entire length of any next line irrespective of its length, and zone-3 covers the entire length of any line next to zone-2. The governing rules for the proposed strategy are presented. The strategy is examined against a wide range of setting problems of a real part of a high-voltage network with real relay settings. The results confirm that the P-SS achieves the required accurate, sensitive, and selective relay operation.

Published in:

IEEE Transactions on Power Delivery  (Volume:23 ,  Issue: 4 )