A New Scheme of Frequency Variation Protection Resisting Current Transformer Saturation
Jin Neng1, Xing Jiawei1,2, Lin Xiangning1, Chen Dunhui3, Liu Shiming4
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China; 2. China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan 430074 China; 3. Electric Power Research Institute of Guizhou Power Grid Co. Ltd Guiyang 550007 China; 4. School of Electrical Engineering Shandong University Ji’nan 250061 China;
Abstract Current transformer (CT) saturation will lead to the failure to operate for traditional power frequency variation protection when a fault occurs on line, in order to solve this problem, this paper analyzes the relationship between the frequency variation protection working voltage and system impedance, fault current variation and effect of current transformer saturation on power frequency variation protection operation characteristics, and a novel scheme based on the system maximum and minimum setting impedance power frequency variation protection scheme resisting CT saturation is proposed. Theoretical analysis and PSCAD based simulation verification show that the algorithm can not only maintain the operation performance of the original power frequency variation, but also can act accurately operate under CT saturation.
Jin Neng,Xing Jiawei,Lin Xiangning等. A New Scheme of Frequency Variation Protection Resisting Current Transformer Saturation[J]. Transactions of China Electrotechnical Society, 2018, 33(zk1): 213-220.
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2018, Vol. 33 
