PERFORMANCE OF PARALLEL SURGE ARRESTERS

The operation of parallel surge arresters can improve energy absorption capability if the are similar and installed close to each other. However, it has been reported that any small difference in individual V-I characteristics lead unbalance current sharing. When some distance away from other, travelling wave effects modify effectiveness for overvoltage protection and, this case, detailed simulations required ascertain level protection. Such a situation occurs practice with large substations or short underground cable connections. Various studies have shown requirement two-arrester is closely dependent upon type length used. In case overhead lines, distances much bigger main objective line reduce flashover rates due overvoltages. This especially relevant lines located regions high lightning activity, compact/uprated design where phase-to-phase phase-to-earth air clearances reduced. paper, we present study considering separation their application lines. scenarios configurations were considered levels calculated case. Assessment performance also conducted number conditions. A calculation techniques used compared.