Effects of high temperature and high electric field on the space charge behavior in epoxy resin for power modules

Li, Jin; Kong, Xiaoxiao; Sato, Kosuke; Konishi, Soichiro; Tanaka, Yasuhiro; Miyake, Hiroaki; Takada, Tatsuo

doi:10.1109/tdei.2020.008737

Cited by 34 publications

(33 citation statements)

References 15 publications

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“… Wang et al (2019 )studied the problem of interface polarization in epoxy-impregnated paper insulation materials and proposed a method to evaluate the interface charge and electric field distribution under the action of different frequency voltages. Li et al (2020 ) studied the space charge characteristics of epoxy materials at high temperatures and high field strengths and found that the ionization of an unreacted curing agent and electrode charge injection are the main sources of space charge. Awais et al (2021) studied the epoxy composites suitable for high-frequency and high-temperature applications and found that the composite materials suitable for high-frequency and high-temperature environments can be obtained by controlling the stoichiometric ratio of epoxy and added nanofillers.…”

Section: Introductionmentioning

confidence: 99%

Space Charge Dynamics in Epoxy Resins Under the Influence of a Long-Term High Electric Field at Various Temperatures

Zhang

Jin

et al. 2022

Front. Chem.

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As the main insulating material of an ultra-high voltage (UHV) resin impregnated paper (RIP) bushing, epoxy resin accumulates space charge under the DC voltage, which would affect the insulation properties of the bushing. In this article, the evolution of space charge accumulation and dissipation within the epoxy resin samples was measured under the influence of a long-term (24 h) electric field of 60 kV/mm at 40°, 60°, 80°, and 100°C. The experimental results show that the space charge transport in the epoxy sample was a long-time dynamic process. When the temperature was not greater than 60°C, only homocharge accumulation was observed within the samples, and the space charge distribution did not reach a stable state even after 24 h of voltage application. When the temperature was not lower than 80°C, the positive heterocharge accumulation was observed at the interface between cathode and epoxy. Through analysis by fitting and numerical simulation, it was verified that the positive heterocharge accumulation was caused by the limitation of the hole extraction, and the transport of holes within the samples obeyed the jump conductance model.

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Section: Introductionmentioning

confidence: 99%

Space Charge Dynamics in Epoxy Resins Under the Influence of a Long-Term High Electric Field at Various Temperatures

Zhang

Jin

et al. 2022

Front. Chem.

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“…In the case of hybrid composites (i.e., containing both micro and nanofillers), the micro‐nano (SiO 2 ‐Al 2 O 3 ) particles addition to epoxy can significantly suppress the carrier migration and accumulation at high temperature 17 . It was found that hetero charges are accumulated at a high electric field or temperature 18 . However, the main reason still needs to be explored.…”

Section: Introductionmentioning

confidence: 99%

“…17 It was found that hetero charges are accumulated at a high electric field or temperature. 18 However, the main reason still needs to be explored. Furthermore, the reported studies do not consider the simultaneous high electric field and hightemperature environments.…”

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confidence: 99%

Space charge performance of epoxy composites with improved thermal property at high temperature under high electric field

Dai

Zhu

Tanaka

et al. 2021

J of Applied Polymer Sci

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This article investigates the high-temperature space charge dynamics of epoxy composites consisting of micro and nano-AlN fillers under a high electric field.The test temperatures are selected for the space charge measurement based on the glass transition temperature. An indigenously designed pulse electroacoustic system measures the space charge distribution up to 150 C. The stepwise-increasing field is applied to the test samples from 20 to 100 kV/mm at the rate of 20 kV/mm. The epoxy hybrid composites show negligible space charge accumulation at room temperature and low electric fields, which increases at high temperatures and high electric fields. The hybrid composite with 1 wt% nanoparticle has a dielectric breakdown at 100 and 150 C under 100 kV/mm with an evident amount of accumulated charges. In the hybrid composites with 3 and 5 wt% nanofillers, the breakdown is observed under 80 and 100 kV/mm, respectively, at 150 C. Notably, the micro-nano filler addition significantly improves the thermal conductivity of the epoxy resin. The uniform dispersion of the fillers affects the electrical and thermal properties of the epoxy. The charge dynamics-related mechanism is proposed on the basis of morphological characterization and thermal properties of epoxy and its composites.

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“…8 The accumulated space charges distort the local electric field inside the materials. 9 This causes the degradation of polymeric composites or even insulation failures. 10 The addition of graphene oxide (GO), 11 alumina (Al 2 O 3 ), 12 nano-silica (SiO 2 ), 13,14 and other fillers 15,16 can suppress the space charge accumulation in the sample.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The space charges appear in the sample bulk due to the charge injection from the electrode under the high electric field . The accumulated space charges distort the local electric field inside the materials . This causes the degradation of polymeric composites or even insulation failures .…”

Section: Introductionmentioning

confidence: 99%

Effect of Dopamine-Functionalized Nano-h-BN on the Charge Dynamics and Thermal Properties of Epoxy Resins at High Temperatures for Potential Power Module Encapsulation Application

Dai

Tanaka

Awais

et al. 2021

ACS Appl. Electron. Mater.

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This paper investigates the charge dynamics and thermal properties of epoxy and its nanocomposites [(10 and 20 wt % of nano-hexagonal-boron nitride (h-BN)]. Two indigenously developed setups of the integrated charge [Q(t)] measurement and high-temperature space charge measurement are used to analyze the charge dynamics of the prepared samples under different testing conditions. The dispersion of dopamine-functionalized nano-h-BN is characterized by transmission electron microscopy and scanning electron microscopy. The thermal properties are measured using differential scanning calorimetry and thermal conductivity measurements. The results show that the charge property of the 10 wt % EP nanocomposite is the best under all testing conditions. The uniform dispersion of nano-h-BN can improve both the electrical and thermal properties of epoxy. A proposed mechanism explains the effect of the dopaminefunctionalized nano-h-BN particles on the enhancement of nanocomposite properties.

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Effects of high temperature and high electric field on the space charge behavior in epoxy resin for power modules

Cited by 34 publications

References 15 publications

Space Charge Dynamics in Epoxy Resins Under the Influence of a Long-Term High Electric Field at Various Temperatures

Space Charge Dynamics in Epoxy Resins Under the Influence of a Long-Term High Electric Field at Various Temperatures

Space charge performance of epoxy composites with improved thermal property at high temperature under high electric field

Effect of Dopamine-Functionalized Nano-h-BN on the Charge Dynamics and Thermal Properties of Epoxy Resins at High Temperatures for Potential Power Module Encapsulation Application

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