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Effect of Al2O3 nanorods on the performance of oil-impregnated pressboard insulation

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Abstract

The mineral oil (MO) in conjunction with paper is the main insulation components in oil-immersed transformers; their insulation properties play a significant role in the safe and stable operation of power transformers. To strengthen the insulation level of ultra-high voltage transformer and to reduce its size and weight, it is imminent to enhance the insulating performance of transformer oil and oil-impregnated cellulose. Recently, a unique novel effort of suspension of nanorods (NRs) into MO has been carried out and the results have exhibited improved insulation characteristics of transformer oil. The Al2O3 NRs with favorable features were prepared in our laboratory to develop transformer oil/paper insulation system with better insulation performance. The transformer oil-based nanofluids (NFs) were prepared with nanorod shape, oleic acid surface modification and 0.8 g/L concentration of NRs. The impregnated pressboards were prepared by impregnating them into dried oil and NF under vacuum beneath 1 kPa at 80 °C for almost 48 h to obtain the oil-impregnated pressboard (OIP) and nanofluid-impregnated pressboard (NIP), respectively. The interface at solid/liquid is considered weak link and is the main reason of oil-filled transformer collapse. The effect of Al2O3 NRs on creeping discharge and flashover traits of oil/pressboard (OP) interface under AC and impulse voltages were studied. Partial discharge and creeping flashover test of OIPs and NIPs were conducted. TSDC and PEA tests were applied to examine the space charge properties of OP interface before and after suspension of Al2O3 NRs.

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Acknowledgements

The authors gratefully acknowledge monetary assistance for this study from the National Natural Science Foundation of China under Contract Number 51337003, and from the Chinese Ministry of Education Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. Beijing Key Laboratory of High Voltage and EMC, School of Electric and Electronic Engineering, North China Electric Power University, Beijing, 102206, China

    Muhammad Rafiq, Yuzhen Lv & Chengrong Li

  2. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China

    Yuzhen Lv & Qian Sun

  3. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, China

    Muhammad Rafiq, Yuzhen Lv & Chengrong Li

  4. Electrical Engineering Department, University of Engineering and Technology, Taxila, 47080, Pakistan

    Muhammad Rafiq

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  1. Muhammad Rafiq
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Correspondence to Muhammad Rafiq.

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Rafiq, M., Lv, Y., Li, C. et al. Effect of Al2O3 nanorods on the performance of oil-impregnated pressboard insulation. Electr Eng 102, 715–724 (2020). https://doi.org/10.1007/s00202-019-00907-5

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