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Publications
Publications (16)
Thermally conductive polymers are highly desired as electrical insulation material in power-electronic and electrical machines towards high power density and payload efficiencies. This paper investigates the thermal conductivity of hybrid...
Here, based on the dielectric response analysis, we report the charge transport dynamics as related to space charge accumulation for three model XLPE composites with 2D platelet silicate fillers. Dynamics of charge transport and the interplay between polarization and space charge are revealed by the equivalent circuit analysis with the Dissado-Hill...
Fundamental studies of potential candidates for DC electric power transmission in high temperature environment, including ETFE, FEP, PTFE, PI and PEEK, are carried out and presented in form of series papers containing space charge and conduction as part I, partial discharge as part II, and the degradation and surface breakdown as part III. In this...
Due to excellent thermal, mechanical and dielectric properties, high temperature materials have been extensively used as insulation for power cables and electronic circuit boards in applications such as high-temperature turbine-generators, electric propulsion systems in air- and space-craft, marine and rail transportations. The first two parts in t...
Utilizing hybrid electric propulsion systems in next generation of aircrafts with elevated DC voltage level has raised the concern about the degradation of insulation subjected to partial discharge at high altitude and harsh environment. In this work, the surface discharge behavior of commonly used high-temperature insulation materials in aviation...
The silicone-based coating applied to 345 kV post insulators in a
substation on the shore of Long Island Sound has depolymerized over a
period of about 7 years although no in-service failures have occurred.
However, the increasing rate of depolymerization suggests that the
coatings will have to be renewed in the near future. This paper reports
comp...
Analysis using gas chromatography/mass spectroscopy (GC/MS) was
performed for evaluation of surface degradation of silicone insulating
materials. Silicones are used as coatings for porcelain insulators and
shed material for high voltage composite insulators. A comparison
between virgin silicone rubber and aged silicone rubber samples, which
were ag...
Silicone-based materials for outdoor insulators have the advantage
that low molecular weight (LMW) components migrate through the material
and coat the surface, thereby restoring hydrophobicity over a period of
hours. By measuring the IR absorption of siloxane migrating to the
silicone surface through a thin carbon coating, the time constant for
mi...
An RTV silicone rubber coating applied to insulators in a 345 kV
switchyard located near Long Island Sound has depolymerized and become
putty-like after six years of service. Coating samples were taken from
high creep insulators which were energized and weathered, weathered but
not energized, and neither weathered or energized (warehouse storage)....
Thermogravimetric analysis (TGA) was used to evaluate the surface
degradation of polymer insulators designed for outdoor high voltage
applications. Such insulators are usually formed as a composite of
silicone matrix and inorganic materials, such as aluminum trihydrate
(ATH) filler and/or fumed silica. However, the surface of insulators is
subject...
Silicone-based materials for outdoor insulators have the advantage that low molecular weight (LMW) components migrate through the material and coat the surface, thereby restoring hydrophobicity over a period of hours. By measuring the infrared (IR) absorption of siloxane migrating to the silicone surface through a thin carbon coating, the aspect of...
The present contribution describes an analytical technique which
can be used to investigate degradation phenomena of silicones and
provide a quantitative evaluation of surface degradation. The technique
employed in the present investigation is based on the use of gas
chromatography/mass spectrometer (GC/MS) methods
