The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON POWER SYSTEMS
Transactions ID Number: 27-564
Full Name: Suwarno Harjo
Position: Associate Professor
Age: ON
Sex: Male
Address: School of Electrical Engineering and Informatics ITB Jl. Ganesha 10 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: Investigation on Leakage Current Waveforms and Flashover Characteristics of Ceramics for Outdoor Insulators under Clean and Salt Fogs
Authors as they appear in the Paper: Suwarno Juniko P.
Email addresses of all the authors: suwarno@ieee.org,suwarno@hq.ee.itb.ac.id
Number of paper pages: 10
Abstract: Outdoor insulators play an important role in high voltage transmission lines. Since long time ago, ceramic insulators are widely being used in power systems at medium, high and extra high voltage levels. During operation, the insulators may severe a certain degree of pollution which may reduce their performances such as 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. This paper reports the experimental results on the leakage current characteristics of ceramics under various simulated environmental conditions. 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) and IEC 507 (fog 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 also elaborated. Experimental results showed that for clean insulators leakage current was much smaller than polluted insulators. The waveform distortion was observed particularly at positive half cycle when applied voltage was increased to higher than 20 kV. This indicated that electric discharges initiated from air proximity of the sample surface. For kaolin-salt polluted insulators, the LC amplitude was much higher than clean insulators. LC waveform distortion started at 10 kV. Unbalance distortion of LC waveforms was observed similar to those of clean samples. However, for kaolin-salt polluted samples, the distortion was observed mainly at negative half cycles which indicated !
that the electric discharges were initiated from the salt-kaolin layer
embedded on the sample surface. Observation of LC waveforms during the process of flashover revealed that THD of increased with the applied voltage.
Keywords: outdoor insulator, ceramics, leakage current, harmonic, dry band, flashover
EXTENSION of the file: .doc
Special (Invited) Session: Study on Leakage Current Waveforms and Flashover of Ceramic for Outdoor Insulators under Artificially-Simulated Pollutions
Organizer of the Session: 590-266
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