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This paper discusses the partial discharge (PD) resistant mechanism of nanocomposite enamel wires under repetitive surge voltage condition for inverter-fed motors. We focused on the reduction of deterioration depth and the surface condition of nanocomposite enamel wires after repetitive surge voltage application with successive PD. Experimental results revealed that the longer lifetime of breakdown...
The addition of nanoscale metal oxide fillers to polymers has been shown, in many cases, to lead to an improvement in the dielectric breakdown strength and voltage endurance. In this paper, dielectric properties for silica- and alumina-filled polyamideimide (PAI) thin films are reported as a function of particle loading. The dispersion and thermal behavior are quantified. Experiments were also conducted...
Polyethylene oxide (PEO) has been used for several years as an electrolyte solvent in lithium polymer cells. One beneficial quality is its high viscosity, that remains high up to temperatures just short of its solid-state Tm, allowing the production of thin electrolyte layers. PEO batteries are sometimes preferred over lithium ion due to their greater power/weight ratio. PEO is a polar polymer and...
Polymeric nanocomposite materials have shown a big potential for an impact in wire wound rotating machine stator insulation. Small wire wound machines, in fact, have a mainly organic stator winding insulation which is easily degraded by partial discharge (PD) activity. In this kind of equipment, then, the presence of PD activity leads to failure in a very short time. Nanofilled polymeric materials,...
To understand basic electric properties of nano-sized magnesium oxide (MgO) / low-density polyethylene (LDPE) nanocomposite materials, the temperature dependence of breakdown strength and the space charge up to the breakdown has been investigated under DC ramp field. At temperatures at which these investigations were carried out, DC breakdown strength of the sample with the MgO nano-filler (hereafter,...
A nano-composite material is attracting many researchers' attention in the field of dielectric and electrical insulation. The purpose of this study is to investigate the influence of MgO filler size on electrical properties of MgO/LDPE nanocomposite. The volume resistivity, DC breakdown strength and the impulse breakdown strength of low-density polyethylene (LDPE) containing nano-filler or micro-filler...
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