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Studies of dielectric breakdown under pulsed power conditions

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/10807

Studies of dielectric breakdown under pulsed power conditions

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Title: Studies of dielectric breakdown under pulsed power conditions
Author: Castro, Palmarin Jr
Advisor(s): Schamiloglu, Edl
Committee Member(s): Gilmore, Mark
Christodoulou, Christos
Department: University of New Mexico. Dept. of Electrical and Computer Engineering
Subject(s): dielectrics
breakdown
pulsed power
ceramics
solids
LC Subject(s): Breakdown (Electricity)
Pulsed power systems
Titanium dioxide--Electric properties
Ceramic-matrix composites--Electric properties
Electric insulators and insulation--Epoxy resins
Degree Level: Masters
Abstract: In an effort to develop transmission lines with higher energy storage capabilities for compact pulsed power applications, the electrical breakdown strength (BDS) of ceramic dielectrics, particularly titanium oxide and ceramic/epoxy composite materials, are being characterized and studied. Results of research to-date show that the dense titania ceramics with nanocrystalline grain size (~200 nm) exhibit significantly higher electrical BDS as compared to ceramics made using coarse grain (micron grain size) materials when tested under DC conditions. We have performed pulsed testing under similar electric field stresses and found comparable behavior. Furthering the research has led to find the electrical BDS of materials such as ceramic/epoxy composites. These materials seem to be more flexible, robust, and might have increased electrical BDS as compared to dense titania ceramics. The powders are available with nominal particle sizes of 50 nm to 400 nm. The crystalline ceramic powders have uniform spherical morphology, precise stoichiomtery, Ba to Ti ratio, and high ceramic purity. The effects of rise time and fall time of high voltage pulsed power on the breakdown of the ceramic/epoxy composite material will also be the focus of interest. The purpose of this study was to describe test results, review the statistics that are used to analyze the data, and relate the understanding to what has been accumulated in the literature to-date in the context of dielectric breakdown and electrical BDS in such types of materials.
Graduation Date: May 2010
URI: http://hdl.handle.net/1928/10807

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