Suonan Jiale,Liang Zhenfeng,Kang Xiaoning,Luo Yunzhao
(School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,¡¡China)
Abstract:Transverse differential current protection based on fault component has better performance compared with the conventional ones, however,traditional fault component extraction approach can only satisfy the practical demand 2 or 3 cycles after fault inception.Since the coupling double-circuit transmission lines may be decomposed into decoupling the same directional component mode net and the circumfluent component mode net,the analysis demonstrates that the positive and negative sequence current distribution coefficient in the same directional component mode net coincides with that in the circumfluence component mode net,which motivates to propose a novel approach of fault component extraction.With the aid of the approach,the fault components are extracted correctly during the whole process without the influences of load components and network parameters.The digital simulation verifies its validity.
Keywords:double-circuit transmission lines;fault component;transverse differential current protection