Research On Tracking Characteristics Of Organic Insulating Materials

Organic insulating materials subjected to high voltage suffers the well-knowndegradation by tracking. Tracking arises as the result of the formation of conductivecarbon path due to thermal decomposition. In this paper, the processes of theformation are distinguished by computing the fractal dimension. It is revealed thatthe fractal dimension decreases with the growth of carbon path.In recent years, there is an increasing need for electrical devices in variouscomplex environments, which include high temperature and low atmospheric pressure.According, it is necessary to investigate the influence of change environments onorganic insulating materials. The paper makes an investigation of the influences ofhigh temperature and low atmospheric on breakdown strengths, discharge energyassociated with discharge occurring on surface of organic insulating materials byusing a printed circuit board. The experimental results reveal that the environmentalfactors have a great influence on the breakdown strengths.Today, most of organic insulating materials that are used in electric insulation areadded by flame retardant for the sake of the need of fireproofing. Accordingly, it isimportant to investigate whether the flame retardant influences the electric strength ofthe polymers or not. This paper makes a research into the effects of the flameretardant on tracking resistance of polymer insulating surface in high temperature byusing polycarbonate. The results show that the discharge energy increases and thecomparative tracking index (CTI) decreases with increasing the content of flameretardant. The discharge energy decreases and CTI increases with increasing thetemperature.