Abstract
Epoxy resin is the main insulating material used in power equipment. In this paper, in view of the problem of high temperature, strong electric field, and high-order harmonics in the operation of insulation equipment, cycloaliphatic epoxy resin is selected to modify the performance of bisphenol A epoxy resin (DGEBA). The dielectric properties of the modified resin system are studied. It is found that the cycloaliphatic epoxy resin has little effect on the dielectric properties of DGEBA at low temperature. However, when the temperature rises to near the glass transition temperature (T <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</inf> ) of resins, the addition of cycloaliphatic epoxy resin can significantly decrease the permittivity and dielectric loss of the epoxy resin system. The cross-linking density and energy level distribution are discussed to explain the permittivity and conductivity properties of DGEBA and cycloaliphatic epoxy resin. It is concluded that the addition of cycloaliphatic epoxy resin can make higher crosslinking density and larger forbidden band width, which leads to lower dielectric and conductivity loss under high temperature.
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