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Adaptive relay setting for stand-alone digital distance protection

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3 Author(s)
Xia, Y.Q. ; Tianjin Univ., China ; Li, K.K. ; David, A.K.

Reach accuracy of a distance relay on transmission lines is adversely affected by fault resistance combined with remote-end infeed which is not measurable at the relaying point. Different network conditions correspond to different remote-end infeed behaviour and in conventional setting a safety margin is necessary so as to avoid maloperation. In this paper an adaptive setting concept which can overcome this disadvantage is proposed. A microprocessor based distance relay with this new technique can respond to network conditions that change from time to time and computer simulation has confirmed the validity of this new concept

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Power Delivery, IEEE Transactions on  (Volume:9 ,  Issue: 1 )