Solution of the Inverse Problem of “Low-Frequency Overvoltage Excitation to Response” for Electromagnetic Potential Transformers
Yang Ming1, Xiong Zhao1, Sima Wenxia1, Li Yongfu2, He Dongsheng3, Zou Binyang1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400030 China; 2. State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute Chongqing 401123 China; 3. China National Quality Supervision and Testing Center for Smart Grid Transmission and Distribution Equipment Dongguan 523325 China
Abstract：Electromagnetic potential transformer（PT）is a piece of critical voltage measurement equipment widely used in power systems. However, low-frequency electromagnetic transient voltages may excite the core of PT to be saturated, resulting in a significant increase in measurement error. By solving the inverse problem of “low-frequency overvoltage excitation to response” of PT, its primary excitation voltage can be calculated based on the secondary response voltage. Based on the principle of electromagnetic duality, a forward circuit model considering the deep saturation of the iron core and its parameters extraction method are proposed in this paper, then an inverse mathematical model is constructed, which solves the inverse problem of “low-frequency overvoltage excitation to response” of PT. The proposed method is validated by simulations and experiments on a 10kV PT. Results show that the proposed method can significantly decrease the error of the PT from 65.6% to 10%, when it suffers from deep saturation caused by low-frequency transients. The proposed method solves the problem of distortion of the secondary voltage of the PT under the excitation of low-frequency transients.
杨鸣, 熊钊, 司马文霞, 李永福, 何东升, 邹滨阳. 电磁式电压互感器“低频过电压激励-响应”逆问题求解[J]. 电工技术学报, 2021, 36(17): 3605-3613.
Yang Ming, Xiong Zhao, Sima Wenxia, Li Yongfu, He Dongsheng, Zou Binyang. Solution of the Inverse Problem of “Low-Frequency Overvoltage Excitation to Response” for Electromagnetic Potential Transformers. Transactions of China Electrotechnical Society, 2021, 36(17): 3605-3613.
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2021, Vol. 36 
