Distinguishing polymeric insulators PD sources through RF PD measurement

Abedini-Livari, Ali; Firuzi, Keyvan; Vakilian, Mehdi

doi:10.1049/iet-gtd.2020.0099

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…The Morse wavelet was parametrized with gamma equal to 3 and a time-bandwidth product of 120. Furthermore, Abedini-Livari et al [75] used phase-resolved partial discharge patterns to examine the effects of contaminated layer and housing-erosion on partial discharges at the insulator surface. The CWT and GMWs were used on the partial discharge signals to identify polluted insulators used on power grids.…”

Section: Electrical Engineeringmentioning

confidence: 99%

Applications of the Generalized Morse Wavelets: A Review

et al. 2023

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The study of signals, processes, and systems has motivated the development of different representations that can be used to analyze and understand them. Classical ways of studying the behavior of signals are the time domain and frequency domain representations. For the analysis of non-stationary signals, time-frequency representations have become an essential tool to understand how the frequency content of signals changes with time. A common time-frequency technique employed in the literature is the wavelet transform. Nevertheless, selecting an adequate mother wavelet to perform the wavelet transform has become challenging due to the diverse available wavelet families. This paper reviews the applications and uses of a particular class of wavelet basis known as the Generalized Morse Wavelets. This class of wavelet family provides a systematic framework to choose and generate a wavelet for general-purpose use. This study reviews the application of Generalized Morse Wavelets in biomedical engineering, dynamical systems analysis, electrical engineering, geophysics, and communication systems. Moreover, the parameters of the Generalized Morse Wavelets used in each study are presented. The results of this study reveal that Generalized Morse Wavelets have proven helpful in studying signals, systems, and processes in areas ranging from biomedical engineering to geophysics. Nonetheless, the parameters of the Generalized Morse Wavelets are yet to be chosen through a rigorous methodology and argumentation. Therefore, there is an opportunity to generate methods for selecting the parameters of the Generalized Morse Wavelets based on the characteristics of the signals, systems, or processes under research.INDEX TERMS Generalized Morse wavelets, mother wavelet selection, continuous wavelet transform, applications, time-frequency analysis.

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Section: Electrical Engineeringmentioning

confidence: 99%

Applications of the Generalized Morse Wavelets: A Review

et al. 2023

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“…PDs emit light, heat, sound waves and radio waves and may be characterized by the flow of leakage current along the surface of the insulator. Based on these, PD detection can be achieved through different measurement techniques ranging from the use of High Frequency Current Transformers (HFCT), electro-optical sensors, Infra-red camera, ultrasonic sensors, Radio Frequency (RF) antennas and superficial resistance measurement [14,15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

A Study of the Cleansing Effect of Precipitation and Wind on Polluted Outdoor High Voltage Glass Cap and Pin Insulator

2022

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In this work, the extent of natural cleansing effect of rainfall, wind and fog or a combination of these on an insulator string were investigated. Results showed that pollution losses progress with time with a considerable fraction of losses occurring within 15 minutes of testing. While wind alone played little or no role in surface cleansing, it increases the extent of cleansing by rainfall. The topsides of insulators were found to be more affected by natural cleansing compared to the underside. Equivalent Salt Deposit Density (ESDD) and Non-Soluble Deposit Density (NSDD) measurements were carried out. ESDD was found to be higher in the lower disc irrespective of the weather condition the insulator string has been subjected to. NSDD measurements established no pattern on how natural cleansing was impacted by disc position on a string, demonstrating the random nature of pollution-cleansing cycle of outdoor insulators. Insulator performance was assessed by high voltage AC tests and monitoring of partial discharge events using Radio Frequency antennas and a High Frequency Current Transformer (HFCT). Measured output by the HFCT showed that leakage current decreases uniformly with time, and the speed at which this occurs is an indication of the intensity of natural cleansing activity.

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Distinguishing polymeric insulators PD sources through RF PD measurement

Cited by 2 publications

References 26 publications

Applications of the Generalized Morse Wavelets: A Review

Applications of the Generalized Morse Wavelets: A Review

A Study of the Cleansing Effect of Precipitation and Wind on Polluted Outdoor High Voltage Glass Cap and Pin Insulator

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