摘要
为研究运行中的电缆接头内部电场分布情况,改善绝缘性能,对电缆接头电场与温度场进行了仿真研究。在综合分析电缆接头内部热源的基础上,从介质损耗基本公式出发,建立基于等效电容的电场—温度场耦合分析的数值计算公式。采用有限元分析软件——ANSYS对110 kV电缆中间接头进行了电场和温度场的仿真,分析了110 kV电缆中间接头在正常工作、绝缘层出现老化和绝缘层中存在杂质时的温度场和电场分布特性。研究表明:对于运行中的电缆接头,在有些情况下,由于绝缘材料老化与杂质的影响可导致接头内部温度升高,使得结构内部电场分布特性偏离结构原有的设计电场,严重时可导致产品发生热击穿或电击穿。
Aiming at studying the inner electric field distribution of the operating cable joint and improving the performance of the insulation,the simulation research of electric field and temperature field of the power cable joint is carried out.On the basis of analysis of the inner thermal sources of cable joint,the formula which is based on distributed capacitance is deduced from the basic formula of dielectric loss,which is used for analyzing the coupling relationship between the electric field and temperature field.The electric and temperature field of the 110kV power cable joint is simulated by ANSYS software and the different distribution characteristics of the fields when the 110kV cable joint in various conditions such as normal condition,aged condition,or containing impure matters are analyzed.The studies show that in some cases,the aged insulation and the existence of the impure matter can cause the joint temperature increase,which could make the distribution characteristic of the inner electric field of the operating joint deviate from that of design.Under some worse conditions,it can result in thermal or electric breakdown of the products.
出处
《传感器与微系统》
CSCD
北大核心
2011年第8期15-17,21,共4页
Transducer and Microsystem Technologies
