Unraveling High Temperature-Induced Glass Transition Effect on Underlying Multitimescales Dynamic Mechanisms of Epoxy Resin Insulation in Power Electronic Applications

Xize Dai, Rumi Alberto, Andrea Cavallini, Claus Leth Bak, Jian Hao, Ruijin Liao, Huai Wang

Research output: Contribution to journalJournal articleResearchpeer-review

2 Citations (Scopus)

Abstract

Epoxy (EP) resins find widespread application in power electronic (PE) applications characterized by multifrequency electrical stresses. Transient thermal overloads are also not uncommon due to, for example, short circuits in the external circuit. This article investigates the influence of various temperatures on broadband dielectric properties of EP insulation, above and below the glass transition temperature (T g). The underlying multitimescale dynamic processes, conductivity, and relaxation mechanisms are revealed based on multiple spectroscopy techniques. In particular, the dependence on the frequency and amplitude of loss peaks on temperatures is modeled considering the potential use of this model in the multiphysics design of PE applications. Results show that the high temperature above T g substantially triggers noticeable low-frequency quasi-dc conductance behavior and multiple non-Debye relaxation processes in higher-frequency regions. Once the operating temperature exceeds the T g, the low-frequency (0.1-100 Hz), real permittivity and loss factor will increase by more than dozens of times. The low-frequency quasi-dc conductivity will increase by about six magnitudes from 25°C to 200°C. As a result of the findings in this article, future insulation circuit modeling and reliable insulation design will consider the underlying multitimescale physical mechanisms to support the multifrequency applications.

Original languageEnglish
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume31
Issue number5
Pages (from-to)2290-2298
Number of pages9
DOIs
Publication statusPublished - 2024

Keywords

  • Broadband Dielectric Properties
  • Conductivity
  • Dielectrics
  • Epoxy Resin
  • Glass
  • Glass Transition Temperature
  • High Temperature
  • Insulation
  • Permittivity
  • Power Electronics Applications
  • Power Electronics Applicatiosn
  • Temperature
  • Temperature measurement
  • power electronics (PEs) applications
  • Broadband dielectric properties
  • glass transition temperature
  • high temperature
  • epoxy (EP) resin

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