Application of nonlinear finite element method in electric field calculation of composite insulation structure of transformer outlet

被引：0
|
作者：
Zhang S. [1 ]
机构：
[1] Chongqing Electric Power Research Institute of State Grid Chongqing Electric Power Company, Chongqing
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2020年 / 40卷 / 04期
关键词：
Composite insulation; Converter transformer; Converter transformer's outlet system; Nonlinear finite element method; Polarity reversal; Transient electric field;
D O I：
10.16081/j.epae.202004014
中图分类号：
学科分类号：
摘要：
The polarity reversal is a special state of composite insulation in converter transformer's outlet system, which can lead to electric field distortion within insulating dielectric and at the interface of insulating dielectric due to space charge effect. On the other hand, the electrical property parameters of insulating dielectric are function of temperature, thus, the changes of electrical parameters caused by temperature gra-dient will affect transient electric field distribution of insulation structure in process of polarity reversal. On this basis, to accurately simulate the polarity reversal transient electric field of composite insulation structure with temperature gradient, it is proposed to apply the nonlinear finite element method in the coup-led analysis of the above two affecting factors of transient electric field. Firstly, the relationship between electrical parameters of composite insulation dielectric of oil-immersed paper and temperature is investigated. Then, the flowchart of transient electric field calculation based on the nonlinear finite element method is introduced in detail and verified by the double coaxial composite insulation structure model. Finally, a 2D simulation model of oil impre-gnated paper insulating dielectric of actual converter transformer's outlet system is established to simulate and analyze the transient electric field during polarity reversal considering the nonlinear characteristics of materials, which shows that the results of traditional simulation are quite diffe-rent from those considering material non-linearity, and a local high electric field strength area easily appears during polarity reversal process. © 2020, Electric Power Automation Equipment Press. All right reserved.
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页码：218 / 224
页数：6
相关论文
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