基于有限元分析方法,以COMSOL Multiphysics为求解工具,建立了320 kV XLPE高压直流电缆终端模型.分析了不同载流量作用时,直流电压和直流叠加冲击电压作用下电缆终端内部的电场分布,并对直流叠加冲击电压作用下XLPE绝缘屏蔽层的搭接长度对界面电场的影响进行了分析.结果表明:直流电压作用下,XLPE/SR界面的切向场强随载流量增大而增大,而且最大场强的位置由应力锥端部转移至应力锥根部;直流叠加冲击电压作用下,界面切向场强在绝缘屏蔽层搭接位置出现畸变,最大场强值位于屏蔽层顶部;同时随着搭接长度的增大,界面切向场强逐渐减小,为防止电缆终端内部出现空气击穿现象,建议屏蔽层的搭接长度至少为25 mm.
Based on the finite element analysis method, a model of 320 kV HVDC XLPE cable terminal was established using COMSOL Multiphysics. The electric field distribution in cable terminal under the effect of DC voltage and DC superimposed impulse voltage was studied under different current carrying capacity. Then the influence of lap length of XLPE insulation shielding layer on the interface field strength under DC superimposed impulse voltage was analyzed. The results show that under the effect of DC voltage, the tangential field strength of XLPE/SR interface increases with the increase of current carrying capacity, and the position of maximum electric field strength shifts from the end of stress cone to the root. Under the effect of DC superimposed impulse voltage, the tangential electric field distorts in the lap position of insulation shielding layer, and the maximum of tangential field strength appears on the top of shielding layer. With the increase of lap length, the interface tangential field strength decreases gradually. In order to prevent the air breakdown in the terminal, it is suggested that the lap length of shielding layer should be 25 mm at least.
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