Development of Pearl-chain-type Electrical Tree in Silicone Gel under Modified AC Voltage

Abstract

The development of electrical tree is one factor that the breakdown occur in solid insulator. So, the study concerning the tree has been proceeded. When the silicone rubber gel made by changing the degree of cross-linking agent was used as a sample, the tree named pearl-chain-type was generated. The pearl-chain-type tree consisted of two parts: string and bubble. Branching occurred at bubble parts. In this study, the pattern of pearl-chain-type tree was observed under different frequency of applied voltage using a high speed camera. Main branche and side branch was also considered.