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Studies on Phase-Selector Based on Modal Transformation and Fault Component

Lin Xiangning Liu Pei Liu Shiming(Huazhong University of Science and Technology 430074 China)Yang Chunming(Group of Dong Fang Electronic Information Industry Inc 264001 China)  
The behavior of a modal transformation based on fault component phase selector are discussed in detail with regard to the changes of the system parameters and fault types.In contrast to the phase selector using superimposed line current,it is figured out in this paper that this phase selector still can't attain the theoretic selectivity for a real fault,furthermore,the sensitivity still may be deficient when the relay is located on the side of weak source.However,the integral performance of this phase selector is slightly better than that of the phase selector based on superimposed line current.Thereby,a new scheme of phase selection is proposed.The effectiveness of the scheme is verified with the EMTP simulation.
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