Dielectric characterisation of epoxy nanocomposite with barium titanate fillers

Autor: Romana Zafar, Nandini Gupta
Jazyk: angličtina
Rok vydání: 2020
Předmět:
filled polymers
bushings
permittivity
electric breakdown
space charge
nanoparticles
pulsed electroacoustic methods
nanocomposites
resins
barium compounds
electric strength
dielectric polarisation
dielectric depolarisation
electrical conductivity
epoxy insulation
barium titanate nanofillers
high permittivity materials
high-voltage apparatus
energy storage systems
epoxy-based high permittivity nanocomposites
stress mitigation
as-received fillers
surface-functionalised nanoparticles
3-glycidoxypropyltrimethoxy-silane
complex permittivity
dc conductivity
space charge accumulation
high-voltage insulation
broadband dielectric spectroscopy
short-term ac breakdown strength tests
space charge density
epoxy resin
electric stress control
high-voltage equipment
dielectric characterisation
polarisation-depolarisation current measurements
power frequency
pulsed electroacoustic technique
frequency 50.0 hz
voltage 69.0 kv
frequency 1.0 mhz to 1.0 mhz
batio(3)
Materials of engineering and construction. Mechanics of materials
TA401-492
Zdroj: IET Nanodielectrics (2020)
Druh dokumentu: article
ISSN: 2514-3255
DOI: 10.1049/iet-nde.2019.0037
Popis: High permittivity materials are currently in use for mitigation of electrical stress in high-voltage apparatus and energy storage systems. In this work, epoxy-based high permittivity nanocomposites with Barium titanate (BaTiO(3)) nanofillers are considered, for the purpose of stress mitigation. Uniform dispersion of the fillers in the polymer up to 10% by volume is achieved. Apart from the use of as-received fillers, the effect of using surface-functionalised nanoparticles (with 3-glycidoxypropyltrimethoxy-silane) before use is also investigated. The nanocomposite is characterised in terms of its complex permittivity, DC conductivity, short-term AC breakdown strength and space charge accumulation, to gauge its suitability for use in high-voltage insulation. Complex permittivity is measured using broadband dielectric spectroscopy over a broad frequency range of 1 mHz to 1 MHz. DC conductivity is studied from polarisation–depolarisation current measurements. Short-term AC breakdown strength tests are performed at power frequency (50 Hz). Space charge density along the sample thickness is obtained using pulsed electro-acoustic technique. A computational case-study is presented to show the feasibility of using the high permittivity nanocomposite for electric stress control in high-voltage equipment (viz., at mounting flanges of 69 kV bushings).
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