Numerical Simulation Method of Electric Field in Oil-Paper Insulation

被引：0
|
作者：
Lian Q. [1 ]
Du Z. [1 ]
Yang Z. [1 ]
Jin S. [1 ]
Ruan J. [1 ]
机构：
[1] School of Electrical Engineering, Wuhan University, Wuhan
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2017年 / 32卷 / 20期
关键词：
Oil-paper insulation; Polarity reversal; Space charge; Temperature gradient; Transient upstream finite element method;
D O I：
10.19595/j.cnki.1000-6753.tces.170140
中图分类号：
学科分类号：
摘要：
The oil-paper insulation as the main insulating medium of the converter transformer, its distribution of electric field is influenced by applied voltage and space charge. The traditional numerical methods fail to figure up the influence of space charge accurately. In this paper, a method based on Schottky emission theory and transient upstream finite element method (TUFEM) was proposed to solve the carrier transport equations. The simulation of charge motion characteristics in single oil-paper insulation was carried out considering electrode implantation barrier, carrier mobility, trap coefficient and carrier recombination coefficient. Compared with the test results, the simulation results indicate this method has high accuracy. The effects of temperature gradient on the electric field intensity distortion in oil-paper insulation were studied. Moreover, the charge movement and electric distribution at different time moments under the polarity reversal voltage were calculated. This method can be applied to the calculation and optimization design of the insulation electric field in the high voltage DC converter transformer. © 2017, The editorial office of Transaction of China Electrotechnical Society. All right reserved.
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页码：53 / 61
页数：8
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