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《CHINESE SOCIETY FOR ELECTRICAL ENGINEERING》 1994-06
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A New Digital Impedance Relay with Improved Performance

Zhang Zhe ; Chen Deshu (Huazhong University of Science & Technology Wuhan 430074)  
This paper describes the design of a new digital impedance relay in which some adaptive principles are applied in order to obtainimproved performance. Two major innovatians are considered in the design. The first is to design the relay with adaptive speedmost needed.The second is to adjust the operating criterion of the relay on-line according to the real earth-fault conditions.Thus laboratory environment.Results of the test are also presented in this paper.
【CateGory Index】: TM773
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