The influence of water membrane on charge accumulation characteristics of insulating dielectric film

The charge will accumulate on the surface of agricultural greenhouse, and then make the ground-level electric field distorted when the HVDC transmission lines cross over the agricultural green house. But the situation is short of research that there is water membrane on the surface of the insulating film. In this paper, the uniform ion flow is produced by a parallel-plate ion flow generator to make surface charge accumulation on insulating film. The ground-level electric field is measured by electric field mill, and surface charge is calculated from surface potential which is measured by Electrostatic Voltmeter. Through the experiment results, surface charge distribution is influenced by upper-surface water membrane mainly, while ground-level electric film is influenced by lower-surface water membrane mainly.