Joanne Ronzello

Joanne Ronzello
University of Connecticut | UConn · Institute of Materials Science

About

16
Publications
1,127
Reads
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315
Citations
Citations since 2017
9 Research Items
125 Citations
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2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
Introduction
Skills and Expertise

Publications

Publications (16)
Article
Full-text available
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...
Article
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...
Article
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...
Article
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...
Article
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...
Article
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...
Article
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...
Article
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...
Article
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)....
Conference Paper
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...
Conference Paper
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...
Conference Paper
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

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