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Ground distance relay Compensation based on fault resistance calculation

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1 Author(s)
Eissa, M.M. ; Dept. of Electr. Eng., Helwan Univ., Cairo

The fault resistance introduces an error in the fault distance estimate, and hence may create an unreliable operation of a distance relay. A new compensation method based on fault resistance calculation is presented. The fault resistance calculation is based on monitoring the active power at the relay point. The compensated fault impedance measures accurately the impedance between the relay location and the fault point. The relay has shown satisfactory performances under various fault conditions especially for the ground faults with high fault resistance. This new compensation method avoids the under-reach problem in ground distance relays

Published in:

Power Delivery, IEEE Transactions on  (Volume:21 ,  Issue: 4 )