低温等离子体表面改性电极材料对液体电介质电荷注入的影响

doi:10.19595/j.cnki.1000-6753.tces.181732

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Abstract The space charge is injected into the liquid by the electrode materials under a strong electric field, which causes electric field distortion and affects the insulation properties of the liquid. In this paper, in order to investigate the effect of surface-modified electrode by low temperature plasma on charge injection of liquid dielectric, the surface of aluminum, copper and stainless steel was sprayed with TiO₂ by vacuum sputtering coating method. The breakdown voltage of the liquid dielectric was tested and the distribution of space charge in the liquid dielectric was also measured by Kerr electro-optic effect before and after modification. The results show that the breakdown voltage of the liquid dielectric increases after the surface modification of aluminum, copper and stainless steel, the increase rates are 6.7%, 4.1% and 9.0%, respectively. The sputtered titanium dioxide film increases the surface shielding layer of the aluminum and copper electrodes, which weakens the electric field distortion of the cathode, resulting in a reduction in the amount of space charge injected into the liquid. Furthermore, the liquid dielectric under the stainless-steel electrode forms a bipolar charge injection, because the particles generated during the sputtering process hit the electrode to change the microstructure of the electrode surface.

Key words： Surface modification electrode material space charge Kerr electro-optical effect

Received: 09 November 2018 Published: 02 September 2019

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TM214

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	Wu Shilin
	Yang Qing
	Shao Tao

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Wu Shilin,Yang Qing,Shao Tao. Effect of Surface-Modified Electrode by Low Temperature Plasma on Charge Injection of Liquid Dielectric[J]. Transactions of China Electrotechnical Society, 2019, 34(16): 3494-3503.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181732 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I16/3494

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