Study on conductive ions distribution in icicles of ice-covered insulators

摘要

Flashover of ice-covered insulators seriously affect the safe operation of transmission lines. Researches show that the conductive ions distribution in icicles is an important factor affecting the flashover of ice-covered insulators. Therefore, insulator icing test with blue copper sulfate solution under energized and un-energized conditions was conducted in this paper. The distribution of copper ions was determined by analyzing the icicle color through the color acquisition software and HSL model. The results show that the conductive ions distribution in icicles is closely related to the icing process. The conductive ions are mostly concentrated in a cylinder region with the same diameter as the icicle tip by icing method 1, while in the icicle tip by icing method 2. The other parts of the icicle are light blue with relatively uniform distribution of conductive ions. The electric field has obvious influence on the conductive ions distribution. When energized icing, the icicle is blue and white as a whole, and the conductive ions in the icicle are much less than those with un-energized icing. Based on the simulation results and solidification theory, the conductive ions distribution in icicles was analyzed theoretically. The analysis results are consistent with the experimental phenomena, and would provide theoretical basis for flashover model of ice-covered insulators.