Study on Transient Insulation Condition of Converter Transformer Based on Nonlinearity Between Temperature and Electric Field

被引：0
作者：
Yang F. [1 ]
Chi C. [1 ]
Liu G. [2 ]
Cheng L. [1 ]
Ou S. [3 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing
[2] Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding
[3] Baotou Power Supply Bureau of Inner Mongolia Electric Power Group Co. Ltd, Baotou
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2020年 / 35卷 / 23期
关键词：
Converter transformer; Nonlinearity; Polarity reverse; Three-electrode; Transient electric field;
D O I：
10.19595/j.cnki.1000-6753.tces.191610
中图分类号：
学科分类号：
摘要：
Converter transformer bears high voltage during operation, and the internal insulation system has high temperature, large electric field intensity and obvious coupling phenomenon. However, the traditional insulation design method does not consider the nonlinear insulation characteristics.. First, a three-electrode experimental platform is constructed to analyze the coupling phenomenon of insulating oil and oil-immersed paperboard at different temperatures and electric field intensities. Results indicate that the electrical conductivity of insulating materials is greatly affected by temperature and electric field intensity, in which the inflection point of insulating oil is 2kV/mm, and the electrical conductivity presents a U-shaped nonlinear curve that first decreases and then increases. Then, a practical converter transformer model is built with refine insulation layer, collar ring and spacer to calculate transient insulation condition with the effect of temperature and electric field. It indicates that converter transformer has larger temperature range and the maximum temperature growth can be up to 68.7K, meanwhile the concentrated temperature area is next to the larger electric field region, so a strong coupling phenomenon cannot be ignored. Under polarity reversal condition, the maximum value of pressboard electric field with U-type electric-dependence increases 1.7kV/mm compared with exponential variation, and reaction rate would decrease in taking nonlinearity between temperature and electric field into account. © 2020, Electrical Technology Press Co. Ltd. All right reserved.
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页码：4971 / 4979
页数：8
相关论文
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