高压直流电缆接头稳态与暂态电场分布特征

发布时间：2018-05-15 07:07

本文选题：高压直流电缆 + 电缆接头　；参考：《高电压技术》2017年11期

【摘要】：为探索高压直流电缆接头内部电场分布规律,特别是增强绝缘非线性特征对电缆接头内部电场分布的影响,在制备纳米硅橡胶复合材料基础上,借助有限元仿真研究了高压直流电缆接头内部电场分布特征。通过对不同温度梯度、施加电压、极性反转时间及增强绝缘电导特征等因素下电场分布特征的研究,得出如下结论:电场强度最大值位置随温度梯度与施加电压的变化在应力锥根部与导体屏蔽管端部间转移。应力锥根部电场强度受接头绝缘材料热活化能、非线性相关系数的调控效应显著。在极性反转过程中,电缆绝缘与导体屏蔽管端部电场强度最大值与极性反转时间近似为指数函数关系;然而,应力锥根部电场强度最大值不受影响。在正极性雷电脉冲下,应力锥根部电场强度最大值随热活化能的减小或非线性相关系数的增大而减小;在负极性雷电脉冲作用下,应力锥根部电场强度最大值随热活化能的减小或非线性相关系数的增大而增加。
[Abstract]:In order to explore the distribution of electric field in the joint of HVDC cable, especially the influence of the nonlinear characteristics of the reinforced insulation on the electric field distribution in the cable joint, the nanosized silicone rubber composite was prepared. The internal electric field distribution characteristics of HVDC cable joint are studied by finite element simulation. The characteristics of electric field distribution under different temperature gradient, applied voltage, polarity reversal time and enhanced insulation conductivity were studied. It is concluded that the maximum position of electric field intensity changes with temperature gradient and applied voltage between the root of stress cone and the end of conductor shielded tube. The electric field strength at the root of the stress cone is affected by the thermal activation energy of the insulating material and the effect of the nonlinear correlation coefficient is significant. In the process of polarity reversal, the maximum value of electric field intensity at the end of cable insulation and conductor shield pipe and the reversal time of polarity are approximately exponential function, however, the maximum electric field intensity at the root of stress cone is not affected. Under the positive lightning pulse, the maximum electric field intensity at the root of the stress cone decreases with the decrease of the thermal activation energy or the increase of the nonlinear correlation coefficient, and under the action of the negative lightning pulse, the maximum electric field intensity decreases with the decrease of the thermal activation energy or the increase of the nonlinear correlation coefficient. The maximum electric field intensity at the root of the stress cone increases with the decrease of the thermal activation energy or the increase of the nonlinear correlation coefficient.
【作者单位】：哈尔滨理工工程电介质及其应用教育部重点实验室;上海起帆电线电缆有限公司;南方电网科学研究院有限责任公司;
【基金】：国家自然科学基金(51337002) 中国南方电网有限责任公司科技项目(KY2014-502)~~
【分类号】：TM247;TM75

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