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《Proceedings of the Csee》 2003-01
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STUDY ON THE NEW ADAPTIVE MHO RELAY

LI Yan , CHEN De-shu , YIN Xiang-gen,ZHAN Yi, HU Yu-feng ( Huazhong University of Science and Technology,Wuhan 430074, China)  
In this paper, a new mho relay based on adaptive principle is proposed. The adaptive mho relay uses the adaptive control method to modify the mho relay that uses remembered voltage polarization. The modified relay can adapt to different earth resistance. The protective zone of the new relay is changed with the different earth-fault resistance adaptively. Thus the adaptive mho relay can reflect the earth-fault up to a super high resistance with high reliability. The simulations show that the new adaptive mho relay has excellent performance, and it can reflect the single- phase-to-earth-fault with resistance more than 800?on a long transmission line of 500kV.
【CateGory Index】: TM588
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