Abstract
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/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> and 12 g/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . 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 application up to 22 g/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> based on a series of experiments for several years under natural humidity condition.
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