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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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

Received: 26 April 2018 Published: 30 October 2018

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TM215.3

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	Articles by authors
	Huang Xuwei
	Ni Xiaoru
	Wang Jian
	Li Qingmin
	Lin Jun
	Wang Zhongdong

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Huang Xuwei,Ni Xiaoru,Wang Jian等. Synthesis of Phenyl-Thioether Polyimide as the Electrode Coating Film and Its Suppression Effect on Motion Behavior of the Metal Particles under DC Stresses[J]. Transactions of China Electrotechnical Society, 2018, 33(20): 4712-4721.

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

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