绝缘纸板表面微纳Al<sub>2</sub>O<sub>3</sub>/PTFE复合功能层制备及其对空间电荷注入的影响

doi:10.19595/j.cnki.1000-6753.tces.191012

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Abstract The suppression of space charge injection and accumulation is of great significance for improving the stability of the oil-paper insulation system in converter transformer. The conventional method of decreasing the space charge amount is to modify the materials by nano doping. However, its modification effect is limited by the degree of nano particles. Surface modification has the advantages of simple craft and good reproducibility, and it can add some new property to the material without affecting other bulk properties. This paper successfully fabricated a micro/nano-structure Al₂O₃/PTFE composite functional film on the surface of the insulation pressboard using ratio frequency magnetron sputtering. The chemical composition and micro morphology were detected. Then the characteristic of space charge, DC breakdown and trap level distribution were analyzed by a comparative method. The results show that, the prepared functional film exists on the surface of the insulation pressboard in a form of micro/nano structure. The functional film can effectively suppress the space charge injection, thereby promoting the DC breakdown voltage. Compared to the untreated pressboard, the total charge amount decreases by 40% under the electric field strength of 15kV/mm, and the distortion of the electric field drops from 33.33% to 6.7%. The DC breakdown promotion of the pressboard increases by 5.3% for the direct breakdown test and 15% for the pre-stress test. The results of the thermal stimulated depolarization current (TSDC) test indicate that the introduction of numerous deep traps is the key factor to explain the space charge mitigation and the increase of DC breakdown voltage.

Key words： Oil-paper insulation magnetron sputtering micro-nano structure composite functional film space charge inhibition DC breakdown

Received: 06 August 2019

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	Li Yanqing
	Hao Jian
	Liu Cong
	Liao Ruijin
	Yang Lijun

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Li Yanqing,Hao Jian,Liu Cong等. Fabrication of the Micro/Nano-Structure Al₂O₃/PTFE Composite Functional Film on the Surface of Insulation Pressboard and Its Effect on Space Charge Injection[J]. Transactions of China Electrotechnical Society, 2020, 35(18): 3960-3971.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191012 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I18/3960

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