硅橡胶电导特性对XLPE绝缘高压直流电缆终端电场分布的影响

发布时间：2018-09-04 07:19

【摘要】：交联聚乙烯(XLPE)绝缘高压直流电缆终端内各绝缘材料的电导率受温度和电场强度的影响差异较大,这是导致其电场分布复杂、研发难度大的关键因素之一。为此,利用多物理场耦合软件仿真计算了以不同性质硅橡胶为增强绝缘的高压直流电缆终端模型内的电场分布,分析了绝缘材料的电导特性对电场分布的影响与机理。研究结果表明:以高压交流电缆终端中常用的硅橡胶作为直流电缆终端的增强绝缘时,应力锥根部的硅橡胶内电场严重畸变,最大电场强度(简称场强)值约达到电缆本体平均场强的6.7倍;以具有合适非线性电导特性的硅橡胶做增强绝缘时,直流电缆终端内电场分布均匀,且最大场强点位于电缆XLPE绝缘内。说明应用电导非线性硅橡胶是解决XLPE绝缘高压直流电缆终端制造瓶颈问题的有效方法之一。
[Abstract]:The conductivity of each insulating material in (XLPE) insulated high voltage DC cable terminal is influenced by temperature and electric field strength, which is one of the key factors that lead to the complex electric field distribution and the difficulty of R & D. In this paper, the electric field distribution in the terminal model of HVDC cable with different properties of silicone rubber as reinforced insulation is simulated by using multi-physical field coupling software, and the influence and mechanism of the conductance characteristics of insulating material on the electric field distribution are analyzed. The results show that when silicone rubber, which is commonly used in high-voltage AC cable terminals, is used as the reinforced insulation of DC cable terminals, the electric field in the silicone rubber at the root of the stress cone is seriously distorted. The maximum electric field intensity is about 6.7 times of the average field strength of the cable body, and the electric field distribution in the terminal of DC cable is uniform when silicone rubber with suitable nonlinear conductance characteristics is used as reinforcement insulation. And the maximum field strength point lies in the cable XLPE insulation. The application of conductive nonlinear silicone rubber is one of the effective methods to solve the bottleneck problem of XLPE insulated HVDC cable terminal.
【作者单位】：哈尔滨理工大学工程电介质及其应用教育部重点实验室;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) 国家重点基础研究发展计划(973计划)(2014CB239504) 中国南方电网有限责任公司科技项目(KY2014-502)~~
【分类号】：TM247

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