交直流叠加电场下油纸绝缘的油流带电特性

发布时间：2018-04-21 14:11

本文选题：油纸绝缘 + 交直流叠加电场　；参考：《中国电机工程学报》2014年15期

【摘要】：为研究叠加电场作用下油纸绝缘的油流带电特性,在实验室搭建了同轴圆柱电极结构的油纸绝缘模型,利用密闭油循环系统开展了叠加电场下油流带电的试验研究,并探讨了外施电压幅值、直流分量比例和油流速度对油流带电的影响。试验结果表明,流速和外施电压幅值对冲流电流的影响与温度有关。在低温下冲流电流随流速和外施电压幅值线性增加,提高直流分量比例会促进冲流电流;在高温下冲流电流随流速指数增加,随外施电压幅值提高出现峰值,峰值电压随直流分量比例提高而下降。理论分析表明:较低温度下油中冲流电流大小取决于纸中负离子的迁移和扩散速度;而在较高温度下该冲流电流取决于油流剥离正离子的速度和外电极处电荷泄放的速率;温度通过影响绝缘中离子迁移速度和电场分布而影响油流带电特性。
[Abstract]:In order to study the oil-flow electrification characteristics of oil-paper insulation under superposition electric field, a oil-paper insulation model with coaxial cylindrical electrode structure was set up in the laboratory, and an experimental study on oil-flow electrification under superimposed electric field was carried out by using closed oil circulation system. The effects of applied voltage amplitude, DC component ratio and oil flow velocity on oil flow electrification are discussed. The experimental results show that the effect of flow velocity and amplitude of applied voltage on the current is related to temperature. At low temperature, the flushing current increases linearly with the velocity of flow and the amplitude of applied voltage, and the ratio of DC component increases with the increase of flow rate, while at high temperature, the flushing current increases with the flow rate exponent, and the peak value appears with the increase of the amplitude of applied voltage. The peak voltage decreases with the increase of DC component ratio. The theoretical analysis shows that the magnitude of the scour current in the oil at lower temperature depends on the migration and diffusion rate of the negative ions in the paper, but at higher temperature the current depends on the velocity of the oil flow stripping of positive ions and the rate of charge discharge at the external electric poles. Temperature affects the charged characteristics of oil flow by influencing ion migration speed and electric field distribution in insulation.
【作者单位】：工程电介质及其应用教育部重点实验室(哈尔滨理工大学);
【基金】：国家自然科学基金项目(51277047) 黑龙江省杰出青年基金资助项目(JC2010-09)~~
【分类号】：TM855

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