Performance Of Epoxy Resin Insulators In Humid Environments

Epoxy resins belong to a three-dimensional cross-linked polymer network. This structure itself has a natural barrier effect against water molecule penetration, keeping the material's water absorption rate at a low level. The low water absorption characteristic means that even in high humidity environments, the dielectric constant and resistivity of high voltage epoxy resin will not change significantly due to water intrusion.

Surface corona and tracking phenomena, which are prone to occur in humid environments, are also suppressed in high voltage standoff. Some formulations, through optimization of the curing system and micro-filler distribution, give the material surface a certain degree of hydrophobicity, which helps to reduce water film formation and thus reduce the growth trend of surface leakage current.