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A Study on the Thermal Degradation Properties of Epoxy Resin for Cast Resin Transformer  

Lim, Kyung-Bum (한국소방안전협회)
Nam, Ki-Dong (경기지방 중소기업청)
Kim, Ki-Hwan (한국소방안전협회)
Park, Su-Hong (㈜유닉스 전자)
Hwang, Myung-Hwan (인천대학교 안전공학과)
Publication Information
Fire Science and Engineering / v.22, no.2, 2008 , pp. 44-48 More about this Journal
Abstract
In this paper, we measured a contact angle, surface resistivity and XPS to study the thermal aging characteristics of the epoxy resin for cast resin transformer. As a result of this experiment, we found that the contact angle increases up to $200^{\circ}C$ as it causes a re-crosslinking on the surface, but starts decreasing at $250^{\circ}C$ as it causes heat condensation. As a result of examining the oxygen/carbon peaks through the XPS analysis, we obtained a higher oxygen peak vs. carbon in the first untreated sample, but it showed the opposite trend after heat treatment. That rise in the carbon peak continued up to $200^{\circ}C$, but decreased again at the temperatures above. That's because it kept forming a stable surface structure up to $200^{\circ}C$ but its carbon combination got destroyed due to a rapid oxidization at $250^{\circ}C$. And a conduction path was formed easily with the hydrophile property caused by rapid surface activation.
Keywords
Cast resin transformer; Thermal aging; Surface structure; XPS;
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