Abstract：Based on the three-dimensional quasi-static electromagnetic field equation and the characteristics of magnetic field intensity distribution on the flitch plate surface of converter transformer, the approximate mathematical expression of flitch plate loss is derived. Through the analysis of the formula, the variation law of the loss and the difference of the frequency index of the loss are obtained under different current frequencies when the flitch plate is fully slotted and without slotted. In order to verify the correctness of the theoretical analysis and further determine the actual frequency index value of the flitch plate loss calculation, the one-eighth finite element simulation calculation of the flitch plate loss of an 800kV single-phase four-column UHV converter transformer was carried out. The results show that the frequency index of the flitch plate loss decreases with the increase of current frequency, whether the flitch plate is slotted or not. However, the slotting of the flitch plate significantly reduces the fundamental loss and also increases the high-order harmonic loss, so the frequency index of the loss will be far greater than the value of the non-slotted, and 1.5 is advisable in the calculation of the actual load loss of the converter transformer. When the flitch plate is not slotted, the value is 0.6, which is basically consistent with the value 0.5 given by theoretical derivation.
黄天超, 王泽忠. 特高压换流变压器拉板损耗的频率特性分析[J]. 电工技术学报, 2021, 36(19): 4132-4139.
Huang Tianchao, Wang Zezhong. Frequency Characteristic Analysis of Flitch Plate Losses in UHV Converter Transformer. Transactions of China Electrotechnical Society, 2021, 36(19): 4132-4139.
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2021, Vol. 36 
