Environmental Factors Affecting Resist ance to Tracking of Polymeric Insulating Materials
DU Boxue, MA Li (School of Electrical Engineering & Automation, Tianjin University, Tianjin, 300 072, China)
There is no internationally recommended test m ethod for determine resistance to tracking under unusual environmental condition s. This paper summarizes the studies of the effects of UV-rays, atmospheric pre ssure, gamma-ray irradiation, and high temperature on the resistance to trackin g based on IEC 60112 and IEC 60587. The test results show that the time to diele ctric breakdown is shortened by UV-ray irradiation for EX, the CTI is increased for PC and decreased for PET under decreased pressure, as the total gamma-ray irradiation increases the CTI increases for PBN and decreases for PBT, the CTI o f PC increases with increasing the sample temperature, PS behaves quite well in mild acid rain conditions. These findings are important in determining suitable materials in various unusual environmental conditions.
【CateGory Index】： TM852