Journal ArticleDOI
Leakage current patterns on contaminated polymeric surfaces
TLDR
In this article, the authors present measurements of low-level leakage current (LC) patterns on naturally aged insulators and artificially contaminated material samples as well as insulaton, and possible causes for this behavior are discussed and its relations to surface hydrophobicity and electric stress are described.Abstract:
This paper presents measurements of low-level leakage current (LC) patterns on naturally aged insulators and artificially contaminated material samples as well as insulaton. A nonlinear behaviorof the LC has been observed. Possible causes for this behavior are discussed and its relations to surface hydrophobicity and electric stress are described. In addition, neural networks are trained to recognize the LC patterns as well as to estimate their harmonic contents.read more
Citations
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Journal ArticleDOI
Fundamental and low frequency harmonic components of leakage current as a diagnostic tool to study aging of RTV and HTV silicone rubber in salt-fog
TL;DR: In this paper, a correlation has been found between the fundamental and low frequency harmonic components of leakage current and different forms of aging, where erosion could be associated with an increase in the level of both the low frequency and fundamental components.
Journal ArticleDOI
Frequency characteristics of leakage current waveforms of a string of suspension insulators
TL;DR: In this article, the leakage current waveforms and the frequency characteristics of a string of 120-kN suspension insulators were investigated with artificial contamination tests and field tests, and it was found that leakage currents become nearly the symmetrical wave when strong local arcs occur; hence, the intensity of the odd order of harmonic components, e.g., 50, 150, and 250 Hz, is high.
Journal ArticleDOI
Ageing of silicone rubber insulators in coastal and inland tropical environment
TL;DR: In this paper, the performance of silicone rubber composite and hybrid silicone-ceramic insulators was evaluated in laboratory by measurements of leakage currents under clean fog conditions and of wet flashover voltage.
Journal ArticleDOI
Leakage current characterization for estimating the conditions of ceramic and polymeric insulating surfaces
Seiji Kumagai,Noboru Yoshimura +1 more
TL;DR: In this paper, a wavelet transform was used to detect the zero-cross point of the base current at 50 Hz without the need for voltage information, and the source information regarding the distortion level of the current half-wave separated by the zerocross point and a time lag to onset in current attributable to arcs were used in order to obtain the above three components.
Journal ArticleDOI
Aging evaluation of silicone rubber insulators using leakage current and flashover voltage analysis
Iman Ahmadi-Joneidi,Alireza Majzoobi,Amir Abbas Shayegani-Akmal,Hossein Mohseni,Jouya Jadidian +4 more
TL;DR: In this article, the authors present the artificial UV radiation effects on three types of 20 kV silicone rubber (SiR) insulators in a chamber with nine UV-C lamps (50 W/m2) for up to 5000 hours.
References
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AC clean fog tests on nonceramic insulating materials and a comparison with porcelain
R.S. Gorur,J.W. Chang +1 more
TL;DR: In this article, a clean fog test was performed on nonceramic materials used for outdoor high voltage insulators, namely, room and high temperature vulcanizing (RTV and HTV) silicone rubber, and ethylene propylene rubber (EPR), with porcelain used as the reference.
Journal ArticleDOI
Neural networks to analyze surface tracking on solid insulators
TL;DR: In this article, a BPN (back propagation network) type NN (neural network) is trained with different signal types and the system works on a real time basis and warns the user with the first indication of severe damage on the surface and can protect the insulator from excessive damage.
Journal ArticleDOI
Electrical performance of non-ceramic insulators in artificial contamination tests. Role of resting time
R.S. Gorur,J.T. Burnham +1 more
TL;DR: In this article, the electrical performance of artificially contaminated non-ceramic insulators was investigated as a function of resting time. Resting time is defined as the time interval between the application of contamination and start of testing, while contamination severity and resting time were varied as parameters.
Journal ArticleDOI
Surface discharges on polymeric insulator shed surfaces
P. Blackmore,David Birtwhistle +1 more
TL;DR: In this article, the authors describe results of an experimental investigation into surface discharges occurring on the surface of polymeric insulators and show that these discharges are stable atmospheric-pressure glow discharges.
Proceedings ArticleDOI
Leakage current patterns on artificially polluted composite insulators
TL;DR: In this article, a neural network is trained to recognize the leakage current waveforms and evaluate their third harmonic content, and the results are compared with fast Fourier transform (FFT) analyses of the patterns.