The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS
Transactions ID Number: 32-312
Full Name: Dr Suwarno
Position: Associate Professor
Age: ON
Sex: Male
Address: School of Electrical Engineering and Informatics ITB, Jl. Ganesha 10 bandung 40132
Country: INDONESIA
Tel: +622225-2260
Tel prefix: 62
Fax: +62222534222
E-mail address: suwarno@ieee.org
Other E-mails: suwarno@hq.ee.itb.ac.id
Title of the Paper: Electrical Equivalent Circuit of Ceramic Insulators with RTV Silicone Rubber Coating and Computer Simulation of Leakage Currents
Authors as they appear in the Paper: Suwarno and Fari Pratomosiwi
Email addresses of all the authors: suwarno@ieee.org, suwarno@hq.ee.itb.ac.id
Number of paper pages: 10
Abstract: During operation, high voltage insulators may severe a certain degree of pollution which may reduce their performances. RTV silicone rubber coating was proposed to improve the performances of outdoor ceramic insulators especially in highly polluted areas. This paper reports experimental results on the leakage current (LC) on RTV silicone rubber-coated ceramic insulators. The samples used were 20 kV post-pin ceramic insulators. The samples were coated by RTV silicone rubber from Dow Corning. There were 2 kinds of samples. The first one is clean and the second one is kaolin-salt polluted. The sample was put in a climate chamber under certain condition of fog. AC voltage of 50 Hz was applied to the sample and the leakage current flowed on the insulator surface was measured by measuring the voltage across a series resistance using a Digital Oscilloscope with sampling rate of 1 GS/s. The digital data was transferred to a personal computer trough a GPIB for fur!
ther analysis. The experimental results showed that LC waveforms of RTV-coated insulators in general are distorted from sinusoidal applied voltage. The LC waveforms are symmetrical for positive and negative half cycles and no flashover was observed for applied voltage up to 60 kV. The THD as well as magnitude of the LC increased with applied voltage for both clean and kaolin-salt polluted samples.. From the experimental results, electrical equivalent circuit models are proposed. Using the proposed model computer simulation of leakage current waveforms was done using APT/EMTP under various conditions and applied voltages. The simulation was done by choosing appropriate values of capacitances, non linearity and arc models. The simulated LC waveforms were compared to those obtained from experiment. The similarity of the LC waveforms was determined by comparing the LC magnitude, THD, dominant harmonic components and symmetry. The results indicated that simulated leakage c!
urrent waveforms were similar to those obtained from experiment. These
revealed the validity of the proposed model.
Keywords: Ceramic insulator, RTV coating, Equivalent circuit, Leakage current, Harmonics, Computer simulation
EXTENSION of the file: .doc
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