摘要
油纸绝缘作为换流变压器的主绝缘介质,其内部电场的分布受外加电压以及空间电荷的影响,而传统的数值方法无法准确计算空间电荷的影响。提出一种基于电极肖特基发射理论和瞬态上流元法(TUFEM)求解载流子输运方程的方法,计算了考虑注入势垒、载流子迁移率、陷阱捕获系数以及载流子复合系数等参数影响下的单层油纸绝缘介质内部空间电荷运动分布特性。与试验结果对比表明瞬态上流元法的有效性。研究典型油纸绝缘介质结构内部合成电场强度畸变程度随温度梯度变化的特性。同时,计算得到极性反转电压下不同时刻的电荷运动和电场分布规律。该方法可推广在(特)高压直流换流变压器内绝缘电场计算和优化设计。
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.
作者
连启祥
杜志叶
杨知非
金硕
阮江军
Lian Qixiang;Du Zhiye;Yang Zhifei;Jin Shuo;Ruan Jiangjun(School of Electrical Engineering Wuhan University Wuhan 430072 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2017年第20期53-61,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51477120
51741708)
特高压工程技术(昆明
广州)国家工程实验室开放基金(CSGTRC[2015]Q1543B14)资助项目
关键词
油纸绝缘
空间电荷
瞬态上流元法
温度梯度
极性反转
Oil-paper insulation
space charge
transient upstream finite element method
temperature gradient
polarity reversal
作者简介
连启祥，男，1993年生，硕士研究生，研究方向为电磁场数值计算等。E-mail: Leventlqx@126.com（通信作者）;杜志叶，男，1974年生，博士，副教授，研究方向为电磁场数值计算、特高压直流输电关键技术等。E-mail: Duzhiye@126.com
