The 150 kV Koto Panjang – Payakumbuh transmission line has a length of 86 km with 249 towers, and the occurrence back-flashover in their is 74%, indicated by high tower footing resistance as that >3 ohms. type rock on location 79% hilly or mountainous terrains, are among factors can cause an increase value. results this study indicate level affects value considering number electrode installatio...

In the traditional designs against contamination of transmission line insulators, maximum insulator severity and surface wetting are assumed as most severe conditions. Then, required number units per string is determined, where a safety margin unit(s) usually allowed based on knowledge obtained at sites in laboratory tests. Other may be created by considering probabilistic distributions factors...

A suitable, non-standard method for artificial pollution testing using simulated acid rain in a laboratory was developed this work. The is applicable to wide range of climatic conditions and acidities. established adopts the solid layer principle preparation application various severities test insulators. Glass cap pin insulators were contaminated, assembled into strings two discs flashover tes...

Aiming to improving the insulator resistance in polluted media, a new proposed model consisting of an insulating surface coated by non-linear conductive film has been studied. There are two important roles film. At low voltage gradient, very small current passes. This leakage tends raise temperatures slightly above ambient and retards dew deposition, which contributes many flashovers. high i.e....

Abstract The causes of flashover on UHVDC transmission lines due to lightning strikes are analyzed. Then, after the introduction characteristics caused by strikes, types and discrimination method, calculation method performance, methods identification faults, preventive measures proposed.