Numerical simulation on molecular displacement and DC breakdown of LDPE

Min, Daomin; Li, Shengtao; Ohki, Yoshimichi

doi:10.1109/tdei.2015.005402

Cited by 74 publications

(70 citation statements)

References 46 publications

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“…Therefore, it was deduced that in the ternary system nanocomposite could distinctively enlarge the intermolecular forces and thus benefit to the dc BDS. This can be well understood by the interaction between the molecular displacement and charge transportation process . The displacement of molecular chains enlarges a local free volume, even leading to small cavities.…”

Section: Discussionmentioning

confidence: 99%

“…This can be well understood by the interaction between the molecular displacement and charge transportation process. 36 The displacement of molecular chains enlarges a local free volume, even leading to small cavities. Meanwhile, the displacement allows a cooperative detrapping of deep trapped charges as suggested in Lovell's model for current multiplication.…”

Section: Discussionmentioning

confidence: 99%

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Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO₂ ternary system

Cheng

Liu

et al. 2019

J of Applied Polymer Sci

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Extensive research studies have been carried out to enhance the energy storage density of polypropylene (PP) films for power capacitor application to cater to the development of power system. However, most of the research studies failed to balance the energy storage density and dielectric loss which generates heat and threatens the operation of power capacitor. In the present study, we proposed a ternary system composited of PP, maleic anhydride‐grafted PP (PP‐g‐MAH), and nano‐ZrO2 with totally 25 compositions in an orthogonal ingredient system. Direct current (dc) breakdown test and dielectric spectra were measured and showed that the largest enhancement of 30.2% of energy storage density was achieved with both increased dielectric constant and dc breakdown strength (BDS), while the dielectric loss kept the same level of neat PP. This on the one hand was attributed to the orientation polarization, ionic polarization, and deep traps introduced by PP‐g‐MAH and nano‐ZrO2, evidenced by the thermal stimulated depolarization current test results. On the other hand, the results of dynamic mechanical analysis indicated that the compatibility of each phases was largely improved in the ternary system so that a high dc BDS was obtained due to the restricted segmental molecular motion. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48211.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO₂ ternary system

Cheng

Liu

et al. 2019

J of Applied Polymer Sci

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“…A set of self-consistent drift-diffusion equations are utilized to calculate the transport and accumulation of space charges and the distribution of electric field inside silicone rubber, and the conduction current through the material. The self-consistent drift-diffusion equations consist of charge conduction equation, charge continuity equation, and Poisson's equation [5,6].…”

Section: Self-consistent Drift-diffusion Equationsmentioning

confidence: 99%

“…The trapping-detrapping-recombination dynamics for mobile electrons Seμ, trapped electrons Set, mobile holes Shμ, and trapped holes Sht are described by the following equations [5,6].…”

Section: Charge Trapping-detrapping-recombination Dynamic Equationsmentioning

confidence: 99%

“…It is of interest to investigate the space charge formation and accumulation properties in silicone rubber under high dc electric field via a bipolar charge injection and transport model. Figure 1 illustrates the schematic of bipolar charge injection and transport model in a polymeric material [5,6]. A polymeric material with a thickness of d is clamped by two electrodes, and a voltage is applied to the material.…”

Section: Introductionmentioning

confidence: 99%

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Space Charge Accumulation in Silicone Rubber Influenced by Poole-Frenkel Effect

et al. 2018

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With the rapid increase of electrical energy consumption in metropolises, more and more power cables are utilized in power grid or urban power network to transmit and distribute electrical energy. Silicone rubber is widely used as polymeric insulating materials of power cable accessories due to their excellent electrical and thermal performances. However, under high dc electric field space charges can accumulate inside the silicone rubber, which will distort the electric field in the bulk of the material, influencing the reliability and safety of operation. A bipolar charge injection and transport model is adopted to investigate the accumulation of space charges and distortion of electric field in silicone rubber. It is found that when charge injection rate is higher than the charge migration rate, space charges will accumulate in the material and the accumulation increases with an increase in electric field. The influence of the Poole-Frenkel effect is then studied. It is found that stronger Poole-Frenkel effect can enhance the nonlinearity of effective carrier mobility of silicone rubber, reducing the accumulation of space charges. This indicates that tuning the nonlinearity of effective carrier mobility by nano-doping can suppress space charges, improving the reliability of power cable accessories.

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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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Numerical simulation on molecular displacement and DC breakdown of LDPE

Cited by 74 publications

References 46 publications

Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO₂ ternary system

Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO₂ ternary system

Space Charge Accumulation in Silicone Rubber Influenced by Poole-Frenkel Effect

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

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Numerical simulation on molecular displacement and DC breakdown of LDPE

Cited by 74 publications

References 46 publications

Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO2 ternary system

Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO2 ternary system

Space Charge Accumulation in Silicone Rubber Influenced by Poole-Frenkel Effect

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

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Product

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Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO₂ ternary system

Enhanced energy storage properties of polypropylene/maleic anhydride‐grafted polypropylene/nano‐ZrO₂ ternary system