Abstract
This paper describes the influence of sample temperatures on tracking breakdown of organic insulating materials by IEC Publ. 112 Method. Trackuig phenomenon is a kind of surface deterioration of organic insulating materials. The mechanism of tracking is not intensively investigated under conditions such as higher temperature environments. According to spread of the systems of transmission and supplying electricity, many electrical and electronic apparatus have been used at higher temperature environments. in this research, phenolic-paper laminates and polycarbonate with and without flame-retardant have been employed to study the influence of test condition on tracking failure. Tests have been carried out in the temperature range of 25 to 150°C with brass electrodes. The results of phenolic-paper laminates and polycarbonate show that with increasing the amount of flame-retardant, the comparative tracking index(CTI)are getting smaller. When sample temperatures are raised higher, the difference of CTI values becomes gradually samll.
