Study on corresponding development of pearl-chain-type electrical treeing to high electric field phenomena in dielectric liquids

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05942
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Ehime University
• Principal Investigator: Ihori Haruo 愛媛大学, 理工学研究科(工学系), 准教授 (70249861)
• Co-Investigator(Renkei-kenkyūsha): FUJII MASAHARU 愛媛大学, 理工学研究科, 教授 (00127911)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 電気トリー / カー効果 / 液体絶縁体 / シリコーンゲル

Outline of Final Research Achievements

In order to understand the growth mechanism of pearl-chain-type electrical trees in a polymer gel, and investigate about the relationship between the liquids and gels for the high electric field phenomena, the electric field distribution must be measured in the gel.
We investigated electric treeing in silicone gel under AC voltage. 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 branches and sub-branch was also considered.
We also studied on the measurement of the electric field strength in a certain gel using Kerr effect. It is interesting that Kerr constant of the gel depend on the weight percent of a solvent.

Free Research Field

電気電子材料