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| Effects of Beating and Hot-pressing Effects on the Pore Structure and Performance of Insulating Paper |
| Received:January 16, 2026 Revised:March 19, 2026 |
| DOI：10.11980/j.issn.0254-508X.2026.07.011 |
| Key Words:insulating paper beating hot-pressing pore structure electrical performance |
| Fund Project:国家电网有限公司总部科技项目（5216A0250024-423-ZN）。 |
| Author Name | Affiliation | Postcode | | Wang Jie* | 1School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | Cui Huize | 2China Electric Power Research Institute Co., Ltd., Beijing, 100192 | 100192 | | Gu Wenwen | 2China Electric Power Research Institute Co., Ltd., Beijing, 100192 | 100192 | | Zhao Zhehui | 2China Electric Power Research Institute Co., Ltd., Beijing, 100192 | 100192 | | Qian Liying | 1School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | Li Junrong* | 1School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:In this study, a series of insulating paper was prepared from softwood pulp under different beating degrees (13~66 °SR) and hot-pressing processes. The effects of different process conditions on the pore structure of insulating paper were explored, and the effects of pore structure changes on the mechanical, impregnation and electrical properties of insulating paper were analyzed. The results showed that with the increase of beating degree from 13 °SR (unbeated) to 66 °SR, the average pore size of unhot-pressed insulating paper decreased from 7.31 µm to 1.13 µm, and the maximum pore size decreased from 18.43 µm to 1.78 µm. The hot-pressing treatment further changed the pore size of the insulating paper to a smaller scale interval. When the beating degree was 66 °SR, the average and maximum pore sizes of the hot-pressed insulating paper were reduced to 0.45 and 0.99 μm, respectively. And the hot-pressing had a more significant effect on changing the pore size of the insulating paper with a low beating degree. After beating and hot-pressing treatment, the pore size of the insulating paper decreased and the distribution narrowed, and the mechanical and electrical properties were improved. However, due to the limited transmission and storage of insulating oil, its oil absorption performance decreased. When the beating degree was 66 °SR, the direct current and alternating current breakdown field strengths of the hot-pressed insulating paper after oil immersion reached 125.2 and 65.8 kV/mm, compared to the paper without beating increased 52.1% and 86.4%, respectively. |
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