In the present study an attempt has been made to understand the characteristics of corona/arcing discharges from water droplet under high electric field, in epoxy nanocomposites, adopting Ultra high frequency (UHF) measurement technique and by Acoustic Emission (AE) technique. The exfoliated/intercalated properties of the nanocomposites were analyzed through transmission electron microscopy (TEM) studies. The hydrophobicity of the material characterized through contact angle measurement.

Ramanujam Sarathi

Department of Electrical Engineering

Acoustic emission testing

Acoustic emissions

Angle measurement

Building materials

contact angle

Drop formation

Drops

Electric fields

Insulating materials

Transmission electron microscopy

DESTRUCTIVE TECHNIQUES

Epoxy nanocomposites

High electric fields

Measurement techniques

ULTRA HIGH FREQUENCIES

Water droplets

Nanocomposites

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Understanding discharge activity due to water droplet on epoxy nanocomposites adopting non-destructive techniques

Proceedings of the International Symposium on Electrical Insulating Materials

Mica sheets are an important component of electrical machine insulation. Although great attention was given to partial discharges and related aspects of such an insulation, relatively little attention was paid to surface discharges. This paper investigates various factors affecting the behavior of water droplets on mica sheets under the influence of uniform electric fields. © 2018 IEEE.

ICHVE 2018 - 2018 IEEE International Conference on High Voltage Engineering and Application

Factors affecting the water droplet behavior on mica sheets under the influence of homogeneous electric fields

In the present work, epoxy nano composite samples of different clay content are subjected to water droplet initiated discharge tests using controlled harmonic content high voltage supply. The effect of a clay additive up to 1% by weight is shown to increase droplet contact angle by 8% with a subsequent reduction beyond this content. Using a UHF technique to identify the corona inception voltage, it is difficult to identify correlation with harmonic content. However, it was found that the corona inception factor (CIF) and the peak factor of the applied AC/harmonic AC voltages showed an inverse relationship. The rise time of the current pulse due to water droplet initiated corona discharge under AC/harmonic AC voltage was found to be about 700 ps and from FFT analysis, the corresponding UHF generated signal has a dominant frequency of about 1 GHz. The characteristics of the captured UHF signals are similar for all investigated clay contents and harmonic AC voltages. It was found that the discharges caused damage near the high voltage electrode and that the surface carbonization is related to the accumulated dissipated energy during the discharge process. Analysis of the voltage, current signals and phase resolved partial discharge (PRPD) studies indicate that discharges occur around the voltage peak and also when the rate of rise of voltage is high. The number of discharges is higher in the positive half cycle compared with the negative half cycle. © 1994-2012 IEEE.

IEEE Transactions on Dielectrics and Electrical Insulation

Understanding water droplet initiated discharges on epoxy nanocomposites under harmonic AC voltages adopting uhf technique

Surface degradation of polyamide nanocomposites caused by partial discharges using IEC (b) electrodes

Polymer nanocomposites as dielectrics and electrical insulation-perspectives for processing technologies, material characterization and future applications

Mathematics

MATHEMATICS: A Second Start, 2 nd edition

Materials Science and Engineering: R: Reports

Polymer-layered silicate nanocomposites: preparation, properties and uses of a new class of materials

Macromolecular Chemistry and Physics

Morphology and toughness/stiffness balance of nanocomposites based upon anhydride-cured epoxy resins and layered silicates

Journal	Proceedings of the International Symposium on Electrical Insulating Materials
Open Access	No