直流GIL绝缘子环氧树脂/碳纳米管复合涂层关键物理性能的分子动力学模拟

doi:10.19595/j.cnki.1000-6753.tces.180811

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Abstract

The surface charge accumulation on the basin insulators is the main reason for the long-term operation of DC gas insulated metal-enclosed transmission line (DC-GIL). It is an effective measure to improve the electric field distribution by coating the insulator surface. There are many repetitive tests for designing composite coating materials. In this paper, based on the molecular dynamics simulation method, nanoparticles were designed and doped in a targeted way. Epoxy resin and four kinds of carbon nanotubes (uncapped, semi-capped, all-capped, and amido-amine functionalized) composite models were established. According to the models, the vital physical properties including mechanical properties, dielectric constant, thermal diffusivity (thermal conductivity, specific heat capacity), and glass transition temperature were calculated under LAMMPS. The results show that the physical properties of the epoxy composites can be enhanced by doping the carbon nanotubes. The composites doped with amido-amine functionalized carbon nanotubes show the most obvious improvement in mechanical properties, dielectric constant and thermal diffusivity, including inhibition of the damage of temperature rise to mechanical properties, reduction of the dielectric constant reduced by 24.8% and the increase of thermal diffusivity by 96.98%. The composites doped with all-capped carbon nanotubes only maximize the glass transition temperature of 25.7K, while the other properties are not significantly improved. In terms of the computed results, it is concluded that the selection of amido-amine functionalized carbon nanotubes as the doped particles of epoxy resin is more suitable for the suppression of surface charge accumulation in practical engineering.

Key words： Epoxy resin carbon nanotubes molecular dynamics simulation dielectric constant thermal diffusivity

Received: 11 May 2018 Published: 30 October 2018

PACS:

TM215.9

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	Han Zhiyun
	Zou Liang
	Xin Zhe
	Zhao Tong
	Zhang Li

Cite this article:

Han Zhiyun,Zou Liang,Xin Zhe等. Molecular Dynamics Simulation of Vital Physical Properties of Epoxy/Carbon Nanotube Composite Coatings on DC GIL Insulators[J]. Transactions of China Electrotechnical Society, 2018, 33(20): 4692-4703.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180811 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I20/4692

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