The ESDD correction was made taking consideration of CaSO4 content in site pollutant which considerably effects on pollution withstand voltage and disposition of polluted external insulation for 1 000 kV substation post and hollow insulators was given,e.

In order to put forward the linear correction factor under different contamination distribution condition,this paper presents the results of study on the contamination characteristics of porcelain insulators under uniform and non-uniform contamination distribution conditions in high altitude areas.

The feasibility of examining electrical porcelain insulator(EPI) with creeping wave probe was stu-(died,) and a special test block was made for the experiment.

By means of investigation on flashover shutdown accident of 110 kV Daxin line,it is analyzed that flashover shutdown causes occurred in the tension pole double bunch dope porcelain insulator.

It is suggested that proper winding angle should be choiced depending on application of composite hollow insulator to enhance its performance price ratio.

Experiments have proved that an improved bentonite used as a plasticizing agent in the body of electrical porcelain insulators can greatly plasticize the body.