基于有限体积法的超高压电缆接头绝缘性能研究

发布时间：2018-04-02 20:37

本文选题：超高压电缆接头　切入点：有限体积法　出处：《高电压技术》2014年12期

【摘要】：超高压(EHV)电缆接头内部存在的缺陷将造成电场集中,局部温度升高,达到一定程度即发生闪络或击穿,影响其安全可靠运行。为研究影响电缆接头内部电场和温度场分布的主要因素,利用有限体积法对电缆接头进行了电场-温度场耦合仿真,研究了电缆接头在正常工作状态、绝缘材料存在杂质颗粒、应力锥表面存在毛刺突起、硅橡胶绝缘材料老化等情况下的电场-温度场分布特性。研究结果表明:接头与绝缘界面、导体屏蔽管两端等位置是绝缘的薄弱环节,容易发生沿面闪络或绝缘击穿;接头绝缘中微小的杂质颗粒可能导致局部温度超过绝缘材料的耐受温度,加速绝缘老化;老化到一定程度时,温度和电场强度又将大幅度升高,对接头安全运行造成严重隐患。该研究结果对电缆接头的结构优化设计和绝缘材料的选择具有一定的参考意义。
[Abstract]:The defects inside the EHVV cable connector will lead to the concentration of electric field and the increase of local temperature. To a certain extent, flashover or breakdown will occur, which will affect its safe and reliable operation.In order to study the main factors that affect the distribution of electric field and temperature field in cable joint, the coupling simulation of electric field and temperature field of cable joint is carried out by using finite volume method. It is studied that the cable joint is in normal working state and impurity particles exist in insulation material.The distribution of electric field and temperature field on the surface of stress cone is characterized by burr protruding and aging of silicone rubber insulating material.The results show that the interface between the joint and the insulation, the two ends of the conductor shield tube are the weak links of the insulation, and it is easy to flashover or break down along the surface.The tiny impurity particles in joint insulation may cause local temperature to exceed the withstand temperature of insulation material, and accelerate insulation aging. When aging to a certain extent, temperature and electric field strength will increase by a large margin, which will cause serious hidden danger to safety operation of joint.The results can be used as a reference for the optimum design of cable joints and the selection of insulating materials.
【作者单位】：武汉大学电气工程学院;中国电力科学研究院;三峡大学电气与新能源学院;
【基金】：国家自然科学基金(51207081)~~
【分类号】：TM75

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