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In recent years, the demand of electric power has enlarged considerably. To satisfy this demand, electrical companies have to improve the efficiency of their transmission lines.The efficiency of the system is based mainly on the continuity of the service, avoiding fault that suppose economical losses for companies and users. To maintain this continuity one of the main problems that have been found is the effect produced by pollution on insulators of electric lines.All insulators, regardless of their material, are exposed to various electrical, mechanical and environmental stresses. The electrical stresses are the consequences of regular voltages and over voltages. The mechanical stresses are related to the presence of various loads, e.g. the weight of conductors and hardware, wind load, ice loads etc. The environmental stresses of prime importance are the many forms of precipitation and pollution.The performance of these high voltage ceramic and non-ceramic insulators is important for...

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