Influence of free charges on flashover of silicone rubber surface with droplet covered
Source abstract
Abstract
Due to the excellent hydrophobicity and transfer property, the flashover performance of silicone rubber composite insulators is considerably higher than that of porcelain and glass insulators. To investigate the flashover process on a water-droplet-covered hydrophobic surface, a water droplet was put on the hydrophobic surface, which was subjected to a uniform AC electric field strength. The dynamics of the micro-water droplet were observed using a high-speed camera. With the increase in the electric field, the state of the water droplet changed from static to a symmetric oscillation. However, with the electric field increased further, free charges were generated by corona discharge. With the presence of free charges, the strong Coulomb force played a critical role in the flashover process on the water-droplet-covered hydrophobic surface. It would not only change the oscillation of water droplets into an asymmetrical pattern but also dramatically elongate the water droplet, which favored the occurrence of flashover. This explains well that flashover normally occurs for a few cycles after the start of asymmetric oscillation.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: High voltage insulation and dielectric phenomena · Surface Modification and Superhydrophobicity · Advanced Surface Polishing Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Tsinghua Shenzhen International Graduate School, Tsinghua University 1 , 518055 Shenzhen,
Inner Mongolia Extra-high Voltage Power Supply Bureau 2 , 010080 Hohhot,
School of Mechanical and Electrical Engineering, Guangzhou University 3 , 510006 Guangzhou,
Funding
Inner Mongolia Electric Power Co., Ltd.
References (27)
Show source-provided references
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