Study Status and Prospect of Natural Contamination Component on Insulator Surface

In order to learn the influence of natural contamination component on contamination evaluation and contamination flashover voltage,the study status of natural contamination component on insulators surface was researched.The component,classification and measurement methods of natural contamination were summed up.Sources of main natural contamination component,relationships between contamination evaluation and natural contamination component,and between contamination flashover voltage and natural contamination component were studied.It was found out that main domestic natural contamination component came from the soot type air pollution;contamination evaluation with equivalent salt deposit density(ESDD) was insufficient.The relationship between contamination flashover voltage and insolubility contamination granularity was found out.Finally,some advises about studying natural contamination component are given out.It is necessary to focus on studying the influence of organic contamination and establish a new contamination evaluation system.