2026-05-20T04:57:38Zhttps://keep.lib.asu.edu/oai/requestoai:keep.lib.asu.edu:node-2013012025-05-06T22:43:47Zoai_pmh:repo_items201301
https://hdl.handle.net/2286/R.2.N.201301
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All Rights Reserved
2025
2027-05-01T17:45:55
201 pages
Doctoral Dissertation
Academic theses
en
Faruqe, Omar
Park, Chanyeop
Bailey, Christopher
Ranjram, Mike
Mantooth, Alan
Arizona State University
Partial requirement for: Ph.D., Arizona State University, 2025
Field of study: Electrical Engineering
As high-power equipment becomes more compact, there is an increasing need for effective insulating materials to ensure reliability. High-voltage systems often face issues with uneven electric fields, especially at ”triple points” where metal, dielectric, and gas meet, leading to material degradation and failure risks. Additionally, advanced semiconductor technology introduces higher voltage demands, which challenge dielectric integrity in power electronics, causing frequent partial discharges (PD) and surface flashovers. Square wave voltages, in particular, produce higher magnitude PD events that accelerate insulation aging more than sinusoidal voltages.This Ph.D. project investigates ways to mitigate these electric stresses in high-voltage insulation. First, nonlinear field grading (NLRFG) materials are studied for their ability to reduce electric field stress in equipment like cable joints, and results are modeled in finite element analysis (FEA). Next, capacitive field grading composites (FCFGCs) are tested for PD reduction in motor windings under rapid power electronic pulses. Finally, the effectiveness of NLRFG and FCFGC in mitigating stress on direct bonded copper (DBC) substrates is evaluated, alongside the impact of electret films on reducing PD in liquid metal polymer composites (LMPCs).
Electrical Engineering
Composites
electric field
Finite Element Analysis
Partial discharge (PD)
power converter
surface flashover
Addressing Dielectric Challenges in Power Dense Systems Utilizing Field Grading Materials