苯硫醚聚酰亚胺电极覆膜材料合成及直流应力下对金属微粒运动特性的抑制作用

doi:10.19595/j.cnki.1000-6753.tces.180708

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摘要

金属微粒的有效治理是关乎直流气体绝缘输电线路（GIL）绝缘设计的重要问题。通过溶液缩聚-热酰亚胺化法制备含有苯硫醚结构的聚酰亚胺薄膜,同时利用红外光谱、热失重、差示扫描量热、介电谱和接触角等测试方法对聚酰亚胺薄膜的结构与性能进行表征,并构建金属微粒运动观测实验平台,测试直流应力下薄膜材料对金属微粒运动特性的抑制作用。结果表明,引入苯硫醚结构,可在保证热稳定性的同时有效提升聚酰亚胺薄膜与铝合金电极的粘附功,因而改性聚酰亚胺可作为直流GIL无胶电极覆膜材料,以提升其运行稳定性。当电极涂覆改性的聚酰亚胺薄膜时,可显著提高金属微粒在直流电场中的启举电压,这缘于引入的苯硫醚结构提高了薄膜的介电常数以及金属微粒与薄膜间的粘附功,使得金属微粒所受的粘附力和静电吸附力均有所提升,进而抑制了微粒在直流电应力下的运动行为。

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	黄旭炜
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关键词 ：直流气体绝缘输电线路, 苯硫醚, 聚酰亚胺, 粘附功, 热稳定性, 电极覆膜, 金属微粒启举

Abstract：

Free particle suppression is a key issue to be addressed in insulation design of DC gas insulated transmission line (GIL). A polyimide containing phenyl thioether group was synthesized by solution polycondensation-thermal imidization based methodology to realize effective control of the free metal particles moving in UHV DC GIL and ensure long-term stable operation. The structure and properties of the polyimide films were characterized by means of Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dielectric spectroscopy and contact angles. A test platform for metal particle moving observation was further constructed as to test the suppressing effect of the polyimide films on the motion behavior of the metal particles under the DC stresses. The observed results show that, inclusion of the phenyl thioether can effectively enhance the adhesion of the polyimide film and the DC GIL electrode. Therefore, the modified polyimide film is a preferable choice to be non-adhesive coating material with the DC GIL electrodes as to improve the operational stability. Further, the DC lifting voltage of the metal particles can be improved with the modified polyimide-coating film attached to the electrode, which dues to the fact that the introduced phenyl thioether increases the dielectric constant of the film and the adhesion strength between the metal particles and the film. Consequently, the adhesion force and the electrostatic adsorption force incurred by the metal particles were improved. Hence, the moving behavior of the metal particles under DC stresses were suppressed effectively with the proposed coating materials.

Key words： DC gas insulated transmission line phenyl thioether polyimide adhesion work thermal stability electrode coating metal particle lifting

收稿日期: 2018-04-26 出版日期: 2018-10-30

PACS:

TM215.3

基金资助:

国家自然科学基金（51737005和51628701）、北京市自然科学基金（3172035）、中央高校基本科研业务费专项资金（2017XS004）和国家留学基a金资助项目

作者简介: 黄旭炜男,1992年生,博士研究生,主要从事新型电介质材料的开发与性能调控工作。E-mail: huangxw@ncepu.edu.cn; 李庆民男,1968年生,教授,博士生导师,主要从事新型特高压直流输变电装备与绝缘技术的研究工作。E-mail: lqmeee@ncepu.edu.cn（通信作者）

引用本文:

黄旭炜, 倪潇茹, 王健, 李庆民, 林俊, 王忠东. 苯硫醚聚酰亚胺电极覆膜材料合成及直流应力下对金属微粒运动特性的抑制作用[J]. 电工技术学报, 2018, 33(20): 4712-4721. Huang Xuwei, Ni Xiaoru, Wang Jian, Li Qingmin, Lin Jun, Wang Zhongdong. Synthesis of Phenyl-Thioether Polyimide as the Electrode Coating Film and Its Suppression Effect on Motion Behavior of the Metal Particles under DC Stresses. Transactions of China Electrotechnical Society, 2018, 33(20): 4712-4721.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.180708 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I20/4712

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