Characteristics of Current Distribution Under the Transposition Structure in Low Voltage Helical Winding of Power Transformer

被引：0
|
作者：
Zhao Y. [1 ]
Wen T. [1 ]
Ni H. [1 ]
Chen W. [2 ]
Zhang Q. [1 ]
Fu Z. [3 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
[2] State Grid Corporation of China, Beijing
[3] State Grid Anhui Electric Power Co., Ltd. Electric Power Research Institute, Hefei
来源：
Gaodianya Jishu/High Voltage Engineering | 2021年 / 47卷 / 09期
关键词：
Current difference between conductors; Electromagnetic force; Helical winding; Short-circuit current; Transposition structure;
D O I：
10.13336/j.1003-6520.hve.20200696
中图分类号：
学科分类号：
摘要：
The transposition structures are widely used in low voltage (LV) helical windings. However, circulating current in these transformers can not be completely eliminated. Analysis of the current distribution is the basis of studying the distribution of the short-circuit electromagnetic force, whereas it is usually ignored in previous studies. In this paper, the winding transposition structure is taken into consideration, and the current distributions of two typical 110 kV transformers are studied. The ratio of the current difference between conductors to the average peak current can reach up to 8.67%. The main reason of uneven current distributions is that the change of winding structure may lead to leakage inductance difference. Besides, the distribution of electromagnetic force on conductors in each LV winding is positively related to the unevenness degree of current distribution. And the maximum ratio is up to 5.9%. The ratio of the current difference between conductors to the average peak current is defined as uneven distribution coefficient Ku, and the Ku is found to be bigger when increasing the conductor height hc or the conductor radial width wc. By comparing the electromagnetic force distribution characteristics of the two LV windings, suggestions are made for the helical winding structure design. The results can provide references for the selection of structural parameters and the verification of windings short-circuit stability in the transformer design process. © 2021, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3218 / 3225
页数：7
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