Fundamental investigation results of diagnostic technique for deteriorated polymer insulators

Abstract

Polymer insulators are widely used aU over the world, owing to their excellent contamination performance, light weight, anti-vandalism characteristics, etc. Ageing deterioration is, however, inevitable with these insulators due to organic materials used for the weather shed and core, and mechanical andlor electrical breakdown ofthese insulators are a point of ongoing concern. Diagnostic methods to detect deteriorated polymer insulators are not established yet, although ClGRE SC 22 reported various techniques. Some serious erosions and shed punctures were observed on some of the polymer insulators removed from a 110-kV transmission tine in China. Diagnostic tests were made on these insulators in an outdoor test station and the results were compared with those obtained in an artificial fog chamber.

Novel technique for estimating pollution-associated leakage current in high-voltage insulators based on adaptive filtering in long-term recording

“…Even so, insulator leakage current measurements in real-time applications depend not only on pollution deposits but also on environmental variables, which fluctuate over time [10,23]. Salam et al found that the leakage current increased as the wind speed increased in the range of 2-4 m s −1 [24] and other authors found that the leakage current increased when insulators lost their hydrophobicity [25][26][27][28][29]. Several studies have reported the relationship between leakage current and relative humidity [13,25,27], and others found that temperature changes had a minor effect on leakage currents [30].…”

Contribución al mantenimiento de aisladores de alta tensión en servicio basado en medidas de corrientes de fuga

“…En niebla fría, la corriente de fuga aumenta en mayor proporción que en lluvia, dado que la tasa de humedecido es lenta y con mayor absorción en la deposición [73]. Otros estudios hallaron que la corriente de fuga aumentaba cuando los aisladores pierden su hidrofobicidad [68,69,[75][76][77].…”