Abstract
Aimed at common insulators in the ±660kV Yin-Dong lines, one-year natural fouling test is implemented to summarize the rules for changes of non-uniformity coefficient at the upper and lower surface of the insulators with different models, and its ash salt ratio and other parameters. AutoCAD software is used to establish the physical 3D models for USSOBP/240H porcelain bell jar insulator and FXBZW-±660/300 composite insulators. Meanwhile, they are also led to Fluent, a fluid mechanics simulation software, to simulate gas solid two-phase flow, analyse distribution of surface static pressure and surrounding air velocity of the insulators, study surface collision characteristics of pollution particles and insulators, and summarize the rules for affecting surface pollution collision rate of insulators by wind speed, diameter of pollution particles, wind declination angle and electric field force and others. Numerical simulation results show that static pressure at windward side of the insulator is greater than the leeward side and airflow velocity can be quickly reduced to be close to zero upon approaching the surface of the insulator. It can be known from this that it’s easy to accumulate pollutions at boundary layer formed at surface of the insulator by ±660kV Yin-Dong lines.
