When the shield lines are not grounded, the electric field is much more less, and it is decided by the angle of protection and the height to ground. But now, there is a certain potential in the shield lines.
计算结果表明:避雷线接地时,其表面有较高的场强,电场强度主要受避雷线半径、保护角及距导线高度影响;避雷线不接地时表面电场较小,但有一定的感应电位,场强和电位大小主要由避雷线保护角及距导线高度决定。
参考来源 - ±800kV特高压直流输电线路导线电场计算方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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