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The existing IEC standard prescribes humidity correction method of disruptive discharge voltage of standard sphere gaps, which is derived from experimental data under absolute humidity between 5 g/m3 and 12 g/m3. However, higher humidity is experienced in summer in Japan and also all over a year in tropical countries. In the present study, validity of the existing correction method is discussed for...
This paper presents the main results regarding the presence of corona on 138 kV lines. Although the study and analysis was mainly focused on the obtention of corona activity through a UV camera, results stemming from an IR camera will also be presented. The substitution of suspected flawed insulators represent to most of the distribution utilities one of the causes of major concern. The results performed...
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