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Your search keyword '"Desai, B M Ashwin"' showing total 6 results
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6 results on '"Desai, B M Ashwin"'

2. Understanding of Incipient discharges in Transformer Insulation by reconstruction of Digital Twins for the discharges using Generative Adversarial Networks

Author

Mahidhar, G. D. P., Kumar, B. Aneesh, Sarathi, R., Taylor, Nathaniel, Edin, Hans Ezz, Desai, B. M. Ashwin, Mahidhar, G. D. P., Kumar, B. Aneesh, Sarathi, R., Taylor, Nathaniel, Edin, Hans Ezz, and Desai, B. M. Ashwin

Abstract

Partial discharge (PD) monitoring is one of the diagnostic technique adopted for identifying the variety of defects in transformer insulation. Ultra high frequency (UHF) technique is gaining importance in PD monitoring applications of transformer due to various advantages. Different type of incipient discharges arose from defects in transformer insulation that needs to be identified. In an actual test site there can be noises that can hinder data acquisition and defect identification can become difficult. By using artificially reconstructed signals of known practically occurring defect models, the loss in data can be overcome. In the present study, Deep Convolutional Generative Adversarial Networks (DCGAN) technique is adopted to reconstruct the UHF partial discharge signals with high fidelity. Time-Frequency characteristics of the signals were used to build the DCGAN network and the reconstructed UHF signals are evaluated by studying the frequency characteristics of the generated signal., QC 20220421part of book ISBN 978-1-6654-1564-4

Published
2021
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6. Performance analysis of epoxy nanocomposites due to water droplet-initiated discharges under AC and DC voltages and localisation of discharges.

Author

Mishra, Palash, Desai, B. M. Ashwin, Sarathi, Ramanujam, and Takahiro Imai

Subjects
*EPOXY compounds, *NANOCOMPOSITE materials, *DIRECT current circuits, *ELECTRIC potential, *SURFACE roughness
Abstract

Corona inception voltage (CIV) due to water droplet sitting over the surface of epoxy nanocomposite material depends on supply voltage frequency, the conductivity of water droplet and the contact angle of the test specimens. The contact angle of the specimen and CIV due to water droplet has a direct correlation. It is realised that the CIV is high under negative DC and the least under AC voltages. Surface charge accumulation studies indicate that the accumulated charge and its decay time constant reduces in the damage-caused zone due to corona activity. The ultra-high frequency (UHF) signal generated due to water droplet-initiated corona activity has frequency content in the range of 0.8-1 GHz. The localisation of incipient discharges is demonstrated by using the non-iterative technique and the cross recurrence plot (CRP) technique is used to estimate the time difference of arrival (TDOA) of UHF signals generated due to water droplet-initiated discharge. Laser-induced breakdown spectroscopy (LIBS) depicts the elemental composition and reveals the difference in plasma temperature and threshold fluence between all the test specimens. In short, the performance of ion trapping particle filled epoxy nanocomposite performance is found to be best followed by titania filled epoxy nanocomposite and the base epoxy resin. [ABSTRACT FROM AUTHOR]

Published
2019
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