外加电压及绝缘温差对XLPE直流电缆电场分布的影响

为了明确交联聚乙烯绝缘直流电缆电场随外加电压和绝缘温差的分布规律,基于有限元仿真分析方法,对±500 kV交联聚乙烯绝缘直流海缆进行了不同外加电压和绝缘温差下的电场分布研究,并与拉普拉斯场强计算方法进行对比。结果表明,通过拉普拉斯场强计算方法得到的直流电缆绝缘场强呈稳定分布,而有限元仿真情况下可见随着绝缘温差升高直流电缆绝缘场强会出现场强翻转情况,并且场强分布同时受绝缘温差和外加电压影响,外加电压增大将导致场强翻转对应的绝缘温差降低。

Influence of Applied Voltage and Insulation Temperature Drop on Electric Field Distribution of XLPE DC Cable

In order to clarify the distribution law of the electric field of XLPE insulated DC cable with the applied voltage and insulation temperature drop,based on the finite element simulation analysis method,the electric field distribution of±500 kV XLPE insulated DC cable under different applied voltage and insulation temperature drop was studied and compared with the Laplace field strength calculation method.Results showed that the DC cable insulation obtained by Laplace field strength calculation method of field intensity distribution was stable,and the reversal of electric field would happen with the increase of temperature drop according to the finite element simulation,and the field intensity distribution affected by the insulation temperature drop and the applied voltage at the same time,the value of temperature drop of the reversal of electric field would decreased when applied voltage increased.