A study on the surface change and dielectric properties of epoxy insulator by water degradation

In examining the polymer application as electrical insulators, it is very important to perform the simulation of accelerated aging test substituted for the process of long-term degradation in actual application on polymer insulators. The purpose of this study is to examine the properties of water degradation which affect on the efficiency of epoxy insulator. To do this, the surface properties on epoxy insulaor have been investigated after long-time accelerated degradation in boiling water condition. The experimental results showed the contact angle and surface resistivity of the treated samples were decreased as a function of exposed time. In dielectric properties, dielectric constant was increased as accelerated degradation developed with water treatments.