Electrical Tree Characteristics in Winding Insulation for Inverter-fed Traction Motor Under Repetitive Impulse Voltages

被引：0
|
作者：
Tang Y. [1 ,2 ]
Liu X. [1 ]
Wang J. [1 ]
Guo Y. [1 ]
Liu Y. [3 ]
Li D. [3 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an
[2] Guangzhou Power Supply Company, Guangdong Power Grid Corporation, Guangzhou
[3] CRRC Yongji Electric Co., Ltd., Xi’an
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 06期
关键词：
electrical tree; inverter-fed traction motor; polybutadiene resin; repetitive impulse voltage; silicone resin;
D O I：
10.13336/j.1003-6520.hve.20220688
中图分类号：
学科分类号：
摘要：
The inverter-fed traction motor plays an important role in the rapidly developing railway transportation, and needs to withstand the impact of high-frequency pulse voltage; moreover, its temperature rise of winding insulation during operation is high, which requires a composite insulation system composed of high heat-resistant insulating impregnating varnish and insulating tape. In this paper, two commonly used impregnating varnishes with the thermal class of C are selected, and three kinds of insulating tapes are composed to prepare different layered composite insulation samples of electrical tree. In order to study the electrical tree characteristics and failure mechanism in different composite insulations, the initiation and morphological characteristics and growth process of electrical tree under the bipolar square wave impulse voltage with different repetitive rates were experimentally investigated and observed with a real-time microscope digital imaging system. By comparison of experiments and research analysis, it is shown that the initiation time of electrical trees in polybutadiene impregnating varnish is much longer than that of the silicone impregnating varnish, and the radial growth rate is significantly faster. The electrical trees in silicone impregnating varnish are more easy to initiate, however, their growth rates after the initiation are slower. With the increase of the impulse voltage repetitive rate, the electrical trees are more easy to initiate and the radial growth rate is faster, whereas, the morphological changes of the electrical trees in two impregnating varnishes are different. The three kinds of insulating tapes have excellent interfacial hindering effect on the growth of electrical trees. Among them, the glass cloth reinforced mica tape, compared with the polyimide film and polyimide film reinforced mica tape, has the most prominent inhibitory effect on the growth of electrical tree, so it is more suitable to be used for the insulation system of the inverter-fed traction motor or high-frequency transformer, which endures the high repetitive impulse voltage. © 2023 Science Press. All rights reserved.
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页码：2625 / 2633
页数：8
相关论文
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