Abstract
Modelling the Leakage Current Behaviour of Polluted Ceramic Insulators by Using Acoustic Emissions and Relative Humidity
Highlights
The most commonly used insulators in power transmission lines and substations are ceramic, glass and porcelain as their dielectric properties help avoid ground faults
This paper presented an leakage current (LC) model obtained from acoustic emission (AE) and relative humidity (RH) that allows identifying circuit outage risk
The study was conducted for dry periods, which are the critical conditions for ceramic insulators under severe pollution, representing well the changes as repetitive cycles influenced by the atmospheric variables
Summary
The most commonly used insulators in power transmission lines and substations are ceramic, glass and porcelain as their dielectric properties help avoid ground faults. When these materials are exposed to severe environmental conditions, such as high marine pollution, industrial pollution and desert pollution, the dielectric properties are affected [1]. When ceramic insulators are used in coastal zones, they are continually subjected to pollutants that change the insulators’ dielectric properties and frequent washing is required to mitigate the risk of failure. Electrical lines and substations require frequent maintenance while the system is energized, which involves using treated water (resistivity >1500 Ω⋅cm or 591 Ω⋅inch) at pressures specified by national and international laws [4, 5]. One study has revealed the low effectiveness of washing insulators with treated water [6], which motivates the continuing search for better alternatives
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