The electric field imposes a significant effect on ice accretion on the insulator. The impact of an AC electric field on insulator icing in an artificial climate chamber has been addressed. Compared with AC, DC electric field exerts an attraction on supercooled water droplets, which is more detrimental to the power system. Moreover, the icing on energised insulators is rarely studied in the natural environment. In the present research, an electrical, fluid coupled-field simulation was carried out on the insulator. The force characteristics and motion deviation features of water droplets at different positive DC electric field strengths were studied. On this basis, rime icing on the insulator energised with different positive DC voltages was investigated in the field. Results show that the charged droplet shifts along the electric field line under a positive DC voltage. The deviation degree of the droplet increases with the increment of the voltage and droplet size and decreases with an increase in wind speed. As the voltage rises, the surface roughness, icing amount and icing length of rime ice-covered insulator increase. Consequently, compared with that without energisation, the local collision coefficient, icing amount and icing length increase by 17.6%, 46.4% and 63.9%, respectively, under a 40 kV DC voltage.

中文翻译：

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自然环境下正直流电场对绝缘子雾凇覆冰的影响及实验验证

电场对绝缘体上的积冰有显着影响。交流电场对人工气候室中绝缘体结冰的影响已经得到解决。与交流相比，直流电场对过冷水滴产生吸引力，对电力系统的危害更大。此外，在自然环境中很少研究带电绝缘子上的结冰。在本研究中，对绝缘子进行了电、流体耦合场模拟。研究了不同正直流电场强度下水滴的受力特性和运动偏差特征。在此基础上，对不同正直流电压下绝缘子上的霜冻现象进行了现场研究。结果表明，带电液滴在正直流电压下沿电场线移动。液滴的偏离程度随着电压和液滴尺寸的增大而增大，随着风速的增大而减小。随着电压的升高，雾冰覆盖绝缘子的表面粗糙度、覆冰量和覆冰长度均增大。结果表明，与未通电时相比，在40 kV直流电压下，局部碰撞系数、结冰量和结冰长度分别增加了17.6%、46.4%和63.9%。