PROJECT TITLE :
Evaluation of ultraviolet ageing, pollution and varistor degradation effects on harmonic contents of surge arrester leakage current
Metal-oxide surge arresters are one in all the foremost important equipments for power system protection against switching and lightning over-voltages. Surge arresters leakage currents increase by the operating time. In this study, the important factors on leakage current variations such as surface contamination, ultraviolet ageing and varistor degradation are studied. To accomplish this purpose, experimental tests have been performed on numerous polymer housed surge arresters. Fast Fourier rework analysis has been performed on measured leakage currents. Results show that ultraviolet radiation and varistor degradation affect resistive harmonic components, especially the third and fifth harmonics. Moreover, it is observed that surface contamination has influence on basic harmonic variation additional than ultraviolet ageing. Further, combination of ultraviolet radiation and pollution had additional impact on leakage currents. The investigation and the discussion of the results can be used to easily analyse arresters condition leading to effective schedule maintenance.
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