高电压技术2016，Vol.42Issue(3)：923-930,8.DOI:10.13336/j.1003-6520.hve.20160308029
温度梯度下油纸绝缘空间电荷特性的数值仿真
Numerical Simulation of Space Charge Property in Oil-paper Insulation Space Under Temperature Gradient
摘要
Abstract
As a main insulation material in high voltage DC power equipment, such as convertor transformer, oil-paper is influenced heavily by space charge under DC voltage.At the same time, the oil-paper insulation always undertakes temperature differences from inside to outside.However, it is still unknown that how the temperature differences affect space charge property of oil-paper insulation.On the basis of former experimental study, we developed a transport model based on bipolar charge transportation and trapping level of materials to simulate space charge property in oil-paper insulation.The temperature gradient effect, namely, the heterocharges accumulating near lower temperature side and further distort local electric field, was gotten by simulation in both single and double layers oil impregnated papers.By comparing calculation results and experimental results, we concluded that the simulation model was reliable.Using this model, the effects of mobility of carriers, thickness of oil impregnated paper, and the temperature of lower temperature electrode were further studied.The results show that the increase of the mobility of oil impregnated paper and the injection rate of electrodes with the increase of temperature is mainly responsible for temperature gradient effect.And the temperature gradient effect turns to be more severe with the increase of mobility of carriers and the decrease of thickness of oil impregnated paper and the temperature of lower temperature electrode.关键词
油纸绝缘/空间电荷/温度梯度/双极性载流子/陷阱/电荷输运仿真Key words
oil-paper insulation/space charge/temperature gradient/bi-polar charge carrier/trap/simulation of charge transport引用本文复制引用
朱庆东,吴锴,朱文兵,李杰..温度梯度下油纸绝缘空间电荷特性的数值仿真[J].高电压技术,2016,42(3):923-930,8.基金项目
国家自然科学基金(51477128).Project supported by National Natural Science Foundation of China (51477128). （51477128）
