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access icon free Performance analysis of epoxy nanocomposites due to water droplet-initiated discharges under AC and DC voltages and localisation of discharges

© The Institution of Engineering and Technology
Received 15/03/2018, Accepted 03/10/2018, Revised 29/07/2018, Published 08/10/2018

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.

Inspec keywords: corona; drops; nanocomposites; plasma diagnostics; filled polymers; epoxy insulation; contact angle; surface charging; resins; plasma temperature

Other keywords: incipient discharge localisation; LIBS; threshold fluence; cross recurrence plot; ultrahigh frequency signal; titania filled epoxy nanocomposite; epoxy resin; plasma temperature; contact angle; frequency 0.8 GHz to 1.0 GHz; laser-induced breakdown spectroscopy; ion trapping particle; supply voltage frequency; noniterative technique; AC voltages; corona inception voltage; elemental composition; decay time constant; water droplet-initiated discharges; surface charge accumulation; TiO2; water droplet-initiated corona activity; DC voltages

Subjects: Fluid surface energy (surface tension, interface tension, angle of contact, etc.); Dielectric breakdown and discharges; Plasma temperature and density; Glow and corona discharges; Organic insulation; Gaseous insulation, breakdown and discharges; Static electrification; Optical (ultraviolet, visible, infrared) plasma diagnostic techniques

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