Uv Resistance Of Epoxy Resin Insulators In Outdoor Ultra-high Voltage Lines

Epoxy resin epoxy resin insulator is widely used in medium and low voltage power distribution, and its excellent mechanical strength and electrical performance are recognized by the industry. However, in the actual operating environment of outdoor ultra-high voltage transmission lines, high voltage epoxy resin faces severe challenges. Strong ultraviolet radiation can cause the molecular chains of epoxy resin to break, resulting in aging phenomena such as powdering and cracking on the surface, directly affecting the stability of insulation performance.

Ultra-high voltage lines exposed to high altitudes or low latitudes for extended periods can experience ultraviolet radiation intensity several times that of plains areas. Under ultraviolet light with a wavelength of 280-400 nm, the organic matrix of Epoxy resin high voltage standoff undergoes a photo-oxidation reaction. This irreversible chemical change causes microcracks to form on the material surface, allowing moisture and contaminants to penetrate into the interior, accelerating the degradation of electrical performance.