The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON SYSTEMS
Transactions ID Number: 32-363
Full Name: Dr Suwarno
Position: Associate Professor
Age: ON
Sex: Male
Address: School of Electrical Engineering and Informatics Institut Teknologi Bandung
Country: INDONESIA
Tel: +62-22-250-2260
Tel prefix:
Fax: +62-22-253-4222
E-mail address: suwarno@ieee.org
Other E-mails: suwarno@hq.ee.itb.ac.id
Title of the Paper: Effects of Humidity and fog conductivity on the Leakage Current Waveforms of Ceramics for Outdoor Insulators
Authors as they appear in the Paper: Suwarno and J. Parhusip
Email addresses of all the authors: suwarno@ieee.org
Number of paper pages: 11
Abstract: Since long time ago, ceramic insulators are widely being used in power systems. The performances of the insulators such as surface resistance and flash over voltages greatly affected by environmental conditions such as pollution and humidity. The pollution may arise in the form of fogs. 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. This paper reports the experimental results on the effects of humidity and fog conductivity on leakage current characteristics of ceramics. 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 magnitudes as well as harmonic content of the LC were analyzed. The experimental re!
sults indicated that under clean fog, LC magnitude almost linearly increased with applied voltage at low and medium RH. At high RH, LC magnitude drastically increased compared to those of low RH. At low RH the dominant harmonics number are 5th , 3 rd and 7th with relatively large amplitude while at medium and high RH the dominant harmonic components of the LC waveforms are 5th and 3rd with smaller amplitude compared to it fundamentals resulting in smaller THD. Under fog condition, LC magnitude increase with fog conductivity. Compared to the LC magnitude under clean fog, the LC magnitude under salt fog was much higher than those from clean fog. At high fog conductivity the oscillation behaviour of LC magnitude dependence on applied voltage was observed due to the wetting effect of sample surface by the fog and drying effect caused by the higher LC. The THD of leakage current under salt fog increased with the applied voltage. LC amplitude increases with applied voltage!
and RH. LC waveforms distortion significantly decreased with the s
alt fog conductivity resulting in smaller THD. At given applied voltage the harmonic components decrease with the increase of fog conductivity.
Keywords: Ceramic insulator, Clean fog, Salt fog, Humidity, Conductivity, Leakage current, Waveform, Harmonics
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