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|Title: ||Leakage Current, Hydrophobicity and Flashover Characteristics of Ceramics for Outdoor Insulators under Artificially-Simulated Pollutions|
|Authors: ||Suwarno, Suwarno|
|Issue Date: ||3-May-2012|
|Abstract: ||Abstract: - Ceramic insulators are now widely used in power systems at medium, high and extra high voltage levels. For outdoor
application, the insulation may severe a certain degree of pollution which may reduce their surface resistance and flash over voltages.
Under these conditions a large leakage current (LC) may flow on the surface and degradation may take place. In long term the
degradation may lead to the flash over of the insulators. In this paper experimental results on the leakage current characteristics of
ceramics under various simulated environmental conditions are reported. The samples used are blocks of ceramics with dimension of
250 x 50 x 20 mm3. The samples were made from same materials for outdoor ceramic insulators. The samples were put in a test chamber
with controlled humidity and artificial pollution conditions. AC voltage with frequency of 50 Hz was applied. The tests were conducted
according to IEC 60-1 (1989) , IEC 507 (fog test) and IEC 587 (inclined plane test). The LC waveforms up to flash over were measured.
The magnitudes as well as harmonic content of the LC were analyzed. The correlation between LC waveforms and dry band arching
phenomenon was elaborated. Visual observation of the arc on the sample surfaces was observed using a video camera. The
hydrophobicity of the materials at different conditions was investigated by measuring the contact angle. The influences of surface
condition and contact angles is also reported.|
|Appears in Collections:||E-Journal Teknologi Industri|
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