交联聚乙烯绝缘高压直流电缆电场分布计算

发布时间：2018-08-29 19:09

【摘要】：为设计交联聚乙烯(XLPE)绝缘高压直流电缆的结构,在实验基础上总结出进口高压直流电缆XLPE绝缘材料的电导特性方程,利用COMSOL Multiphysics软件通过电场和热场耦合仿真计算了电缆在不同负荷下的电场分布。研究表明,在电场强度较低和较高时,进口高压直流电缆XLPE绝缘材料的电导率随温度变化明显,电场强度变化几乎不对其产生影响;在某一电场强度范围内,温度和电场强度的改变均会使XLPE的电导率发生明显变化,该场强范围随温度而变化;所设计高压直流电缆在两种敷设环境下100%负荷时电场分布均匀;在电缆传输电流较大时,电缆XLPE绝缘内的温度梯度增大,电缆绝缘外表面处电场强度最大。基于有限元法的多物理场耦合仿真计算是研究XLPE绝缘高压直流电缆电场分布的有效手段。
[Abstract]:In order to design the structure of XLPE (XLPE) insulated HVDC cable, the conductance equation of imported HV DC cable XLPE insulation material is summarized on the basis of experiment. The electric field distribution of the cable under different loads is simulated by COMSOL Multiphysics software through the coupling of electric field and thermal field. The results show that when the electric field intensity is low and high, the conductivity of XLPE insulation material of imported HVDC cable varies obviously with temperature, and the change of electric field intensity has little effect on it, and in a certain range of electric field intensity, The change of temperature and electric field intensity will make the conductivity of XLPE change obviously, the field intensity range varies with temperature, the electric field distribution of the designed HVDC cable under 100% load in two kinds of laying environment is uniform, and the electric field distribution is uniform when the transmission current of the cable is large. The temperature gradient in cable XLPE insulation increases, and the electric field intensity at the outer surface of cable insulation is the largest. Multi-physical field coupling simulation based on finite element method is an effective method to study the electric field distribution of XLPE insulated HVDC cable.
【作者单位】：宁波东方电缆股份有限公司;哈尔滨理工大学电气与电子工程学院工程电介质及其应用教育部重点实验室;山东电力集团公司日照供电公司;
【基金】：国家自然科学基金重点项目(51337002) 国家863计划项目课题(2013AA050102) 哈尔滨市科技创新人才研究专项资金项目(优秀学科带头人)(2012RFXXG079)
【分类号】：TM247

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