高电压技术2011，Vol.37Issue(4)：823-827,5.
温度梯度效应对油纸绝缘材料空间电荷分布特性的影响
Effect of Temperature Gradient on Space Charge Distribution in Oil Impregnated Papers
摘要
Abstract
Temperature gradient existing in the oil impregnated papers insulation such as converting transformer or DC bushing will strongly impact on the space charge distribution. Consequently, the space charge profiles and field distributions in single layer of oil impregnated papers was measured by the pulsed electro-acoustic (PEA) method under different temperature differences (△θ=0~40℃), and DC stresses of 10, 20 and 40 kV/mm, respectively. The test results show that the heterocharge always exists near both electrodes under different applied DC stresses and different temperature gradients, suggesting that the ionization of the impurity may play an important role in space charge accumulation. Moreover, the higher the temperature difference, the more the heterocharges at the low temperature side of the sample, which results in the greater field distortion there. However, the maximal field distortion factor decreases with the increase of stress. The results will be useful for the optimum design of the oil impregnated papers insulation in the converting transformer.关键词
油纸绝缘/电声脉冲法(PEA)/空间电荷/温度梯度/电场畸变/异极性电荷Key words
oil impregnated papers/ pulsed electro-acoustic (PEA)/ space charge/ temperature gradient/ electric stress distortion/ heterocharges分类
信息技术与安全科学引用本文复制引用
吴锴,朱庆东,陈曦,王霞,成永红..温度梯度效应对油纸绝缘材料空间电荷分布特性的影响[J].高电压技术,2011,37(4):823-827,5.基金项目
国家重点基础研究发展计划(973计划)(2011CB209404) （973计划）
国家自然科学基金(50907050). （50907050）
