Performance of nanofillers in medium voltage magnet wire insulation under high frequency applications

The paper presents the experimental results on accelerated aging of enameled wires with and without nanofiller in the coating under partial discharge (PD) activity. The residual life of the wires, and the surface roughness as measured by a scanning electron microscope (SEM), are used to evaluate the...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2007-04, Vol.14 (2), p.417-426
Main Authors: Haq, S.U., Jayaram, S.H., Cherney, E.A.
Format: Article
Language:English
Subjects:
Cable insulation
Coatings
Electric wire
Electrical insulation
Erosion
Frequency
High frequencies
Mathematical models
Medium voltage
Nanocomposites
Nanomaterials
Nanostructure
Partial discharges
Rough surfaces
Scanning electron microscopy
Studies
Surface discharges
Surface roughness
Wire
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Summary:The paper presents the experimental results on accelerated aging of enameled wires with and without nanofiller in the coating under partial discharge (PD) activity. The residual life of the wires, and the surface roughness as measured by a scanning electron microscope (SEM), are used to evaluate the effects of the nanofiller. The surface erosion in the specimens without nanofiller is considerably greater, which is 1120-1270 nm, under pulse aging; whereas, in specimens with ~1%, by wt, fumed silica (SiO 2 ) nanofiller it was measures to be 230-250 nm. An evaluation of the residual life of the wires, aged under high frequency AC waveforms, reveal that the wires with SiO 2 achieved a life that is twice the life of conventional wires. The two-parameter Weibull distribution of dielectric strength data show that the value of the shape parameter, beta, increases from 2.6 to 11.4 for the coatings with nanofillers indicating that the material becomes more homogeneous and exhibits fewer defects. Finally, the paper discusses possible reasons for the reduction in surface erosion and improvements in breakdown strength of enameled wires filled with various types and concentrations of nanofillers
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2007.344622