Magnetic Crosstalk Characteristic of Unclosed Fiber-Optic Current Transformers
Cheng Song1, Guo Zhizhong1, Zhang Guoqing1, Yu Wenbin1, Jin Shixin2
1.Department of Electrical Engineering Harbin Institute of Technology Harbin 150001 China 2.Electric Power Research Institute of State Grid Liaoning Electric Power Company Shenyang 110000 China
Abstract：The fiber sensing coil of all unclosed fiber-optic current transformers (FOCT) is susceptible to be interfered by magnetic crosstalk and proposes a method that improves the anti-interference ability of magnetic crosstalk.The UFOCT magnetic crosstalk mathematical model is established.The main factors of magnetic crosstalk characteristics contains the unclosed-extent,radius of sensing coil,winding turns of sensing coil and phase distance are obtained through theoretical research and simulation analysis.Meanwhile there are always two best azimuth angles which have UFOCT accuracy immunized magnetic crosstalk.Hereby a optimization method,which set the sensing coil of UFOCT at the best azimuth angle to improve the anti-interference ability of magnetic crosstalk,is proposed.Experimental results are consistent with theoretical analyses and verifies the correctness of the proposed method.The result shows that error induced by magnetic crosstalk reduced from -0.27% down -0.02% with the proposed method,which makes the UFOCT to achieve the 0.2-class standard.
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2017, Vol. 32 
