Experimental Study on the Characteristic of Insulators' Surface Pollution Distribution under Natural Pollution

Abstract

The characteristic of surface pollution on insulators is the crucial factor in causing flashover. A natural pollution accumulation platform that contains porcelain, glass and double-umbrella insulators is built to study the Equivalent Salt Deposit Density (ESDD) and Non Soluble Deposit Density (NSDD) characteristics as well as particle size distribution characteristics on such insulators. The tests indicate that: The glass insulator has higher ESDD and NSDD than the porcelain insulator both on upper surface and lower surface, the double-umbrella insulator also has higher ESDD and NSDD than the porcelain insulator on the upper surface while that on the lower surface is similar. As for the pollution particle size distribution, it can be affected by the insulator's aerodynamic shape, but the influence of the insulator's material can be ignored.