Residual Flux Measurement Method of Power Transformer Based on Extreme Value of Transient Current Difference
Ren Yuzhan1,2, Wu Shipu1,2, Wang Youhua1,2, Liu Chengcheng1,2, Huo Cailing1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China
Abstract：When a transformer is energized under no-load conditions, the magnetizing inrush current will have adverse effects on the power grid and equipment. In order to effectively weaken the residual flux density in the iron core to reduce the occurrence probability of magnetizing inrush current, it is necessary to measure the magnitude and direction of the residual flux density. Based on the electromagnetic transient characteristics of magnetic materials, a method for measuring the residual flux density of applied DC voltage was proposed in this paper. The residual flux density led to different transient current waveforms in the winding under positive and negative voltage. Combined with the field-circuit coupling analysis method, the relationship between the residual flux density and the extreme value of the transient current difference was established. In order to improve the accuracy of the measurement, the square core to be tested was modeled and analyzed, and suitable test circuit parameters were selected. According to the results of finite element calculation, the empirical formula between the residual flux density and the extreme value of the transient current difference was obtained, which laid a foundation for quantitative test of the residual flux density. Finally, a measurement platform was built, and the iron core to be tested was studied by experiments. The measurement results verify the feasibility and accuracy of the proposed method.
任于展, 武仕朴, 汪友华, 刘成成, 火彩玲. 基于暂态电流差极值的电力变压器剩磁测量方法[J]. 电工技术学报, 2022, 37(5): 1088-1097.
Ren Yuzhan, Wu Shipu, Wang Youhua, Liu Chengcheng, Huo Cailing. Residual Flux Measurement Method of Power Transformer Based on Extreme Value of Transient Current Difference. Transactions of China Electrotechnical Society, 2022, 37(5): 1088-1097.
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