Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable
Main Article Content
Abstract
Polypropylene laminated paper (PPLP) and Kraft paper have been studied as multi-layer insulation for high temperature superconducting cable. The experiment was examined with AC and impulse voltages. Short-term and long-term breakdown of insulation samples were investigated. It was found from the experimental results that the breakdown voltage becomes smaller in the order of PPLP, PPLP/Kraft and Kraft, but the lifetime index increases with the presence of Kraft layer in the multi-layer insulation. In addition, the position of PPLP layers has a significant effect on the breakdown voltage of PPLP/Kraft samples under positive impulse voltage. Finally, breakdown mechanism of PPLP/Kraft composite insulation was suggested. Partial discharges in butt-gaps and in the porous structure of insulation layers combined with electric discharges on the surface of these layers are considered to be main factors causing the puncture of multi-layer insulation.
Keywords:
Breakdown voltage, lifetime, insulation, superconducting, cable.
References
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[5] A. Bulinski, J. Densley, High Voltage Insulation for Power Cables Utilizing High Temperature Superconductivity, IEEE Electrical Insulation Magazine, Vol. 15, No. 2, 1999, pp. 14-22, https://doi.org/10.1109/57.753927.
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[8] C. Peng, Y. Wang, S. Dai, Q. Yang, M. Liu, H. Chen, M. Wang, Y. Hu, Insulation Characteristics of Dielectric Material for CD HTS Cable, IEEE Trans. Applied Superconductivity, Vol. 29, No. 2, 2019, pp. 1-5, https://doi.org/10.1109/TASC.2018.2885780.
[9] ASTM, Standard Practice for Preparation of Insulating Paper and Board Impregnated with a Liquid Dielectric, ASTM D2413-16, https://www.astm.org/Standards/D2413.htm, 2020 (accessed on: September 14th, 2020).
[10] ASTM, Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies, ASTM D149-20, https://www.astm.org/Standards/D149.htm, 2020 (accessed on: September 14th, 2020).
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[12] M. Nagao, M. Kurimoto, R. Takahashi, T. Kawashima, Y. Murakami, T. Nishimura, Y. Ashibe, T. Masuda, Dielectric Breakdown Mechanism of Polypropylene Laminated Paper in Liquid Nitrogen, IEEE Conference on Electrical Insulation and Dielectric Phenomena, IEEE, 2011, pp. 419-422.
[13] K. Saitoh, Y. Kawakami, M. Murata, The Effect of The Polypropylene Film on The Impulse Breakdown Strength of The Laminated Oil-Impregnated Papers, IEEE Int. Symp. Electrical Insulation, IEEE, 1992, pp. 209-212.
[14] W. J. Kim, H. J. Kim, J. W. Cho, H. Lee, Y. S. Choi, S. H. Kim, Insulation Characteristics of PPLP and Design of 250 kV Class HTS DC Cable, IEEE Trans. Applied Superconductivity, Vol. 25, No. 3, 2015, pp. 1-4, https://doi.org/10.1109/TASC.2015.2389150.
[15] V. D. Nguyen, J. M. Joung, S. M. Baek, C. H. Lee, S. H. Kim, Ageing Characteristics of Cryogenic Insulator for Development of HTS Cable, Cryogenics, Vol. 45, No. 1, 2005, pp. 57-63, https://doi.org/10.1016/j.cryogenics.2004.09.002.
[16] B. W. Lee, W. Choi, Y. M. Choi, Y. H. Kim, J. Y. Koo, Comparison between PD Inception Voltage and BD Voltage of PPLP in LN2 Considering HTS Insulation, IEEE Trans. Applied Superconductivity, Vol. 23, No. 3, 2013, pp. 1-4, https://doi.org/10.1109/TASC.2013.2240031.
[17] H. G. Cheon, D. S. Kwag, J. H. Choi, H. J. Kim, J. W. Cho, S. H. Kim, A Study on Thickness Effect of HTS Cable for Insulation Design, 7th European Conference on Applied Superconductivity, IOP science, 2006, pp. 889-892.
[18] H. Suzuki, K. Ishihara, S. Akira, Dielectric Insulation Characteristics of Liquid-Nitrogen-Impregnated Laminated Paper-Insulated Cable, IEEE Trans. Power Delivery, Vol. 7, No. 4, 1992, pp. 1677-1680, https://doi.org/10.1109/61.156965.
[19] M. Murata, M. Saito, K. Nakata, Influence of Insulating Paper Formation on the Dielectric and Tensile Breakdown of Oil-impregnated Paper, International Conference on Electrical Insulation, IEEE, 1978, pp. 58-62.