Structural Characteristics Of Epoxy Resin Insulators

In the insulation application of power distribution equipment, high voltage epoxy resin adopts a closed solid structure design, which is different from the liquid encapsulation of traditional oil-immersed products. This structure is widely used in key components such as post insulators, wall bushings, and solidified poles.

Epoxy resin, as a high-molecular polymer, possesses high cohesiveness and a compact molecular structure. During manufacturing, it is molded using an APG process to form a monolithic, sealed solid insulator. This avoids leakage problems that may occur with liquid oil during operation, resulting in a high surface finish and a mechanical strength reaching a breakdown field strength of 20 kV/mm.

The high voltage standoff surface features a corrugated or deep trench design to extend creepage distances and improve insulation levels. Epoxy resin products of the same voltage rating have significantly reduced volume and weight, facilitating integration into equipment such as distribution cabinets, circuit breakers, and switchgear. Products with various voltage ratings from 3 kV to 40.5 kV can be manufactured using solid dielectric casting to meet diverse engineering requirements.