Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the DC and Impulse Breakdown Performances of PPLP Insulation in Liquid Nitrogen for DC Applications

  • Kim, W.J. (Department of Electrical Engineering, Gyeongsang National University and Engineering Research Institute) ;
  • Kim, H.J. (Superconductivity Research Center, Korea Electrotechnology Research Institute) ;
  • Cho, J.W. (Superconductivity Research Center, Korea Electrotechnology Research Institute) ;
  • HwangBo, S. (Department of Electronic and Photonic Engineering, Honam University) ;
  • Kim, S.H. (Department of Electrical Engineering, Gyeongsang National University and Engineering Research Institute)
  • Received : 2012.09.28
  • Accepted : 2012.11.14
  • Published : 2012.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

A high-$T_c$ superconducting (HTS) DC application has advantages such as the ultimately lower loss, more compact dimensions, and large capacity compared to AC application. In order to optimize the insulation design of a HTS DC machines, it is important to understand the high voltage insulation and materials at cryogenic temperature. Polypropylene laminated paper (PPLP) has been widely used as an insulating material for HTS AC machines. However, the fundamental data under DC voltage have not been revealed satisfactorily until now. In this paper, we will discuss mainly on the breakdown and dielectric characteristics of PPLP in liquid nitrogen ($LN_2$). The polarity effects of DC and impulse voltage were studied by using the semi-rod to cylindrical electrode. The volume resistivity of PPLP in $LN_2$ was studied. Also, the space charge distribution at room temperature was studied. However, it is necessary to study this topic at cryogenic temperature in the near future.

Keywords

References

  1. S. Mukoyama, M. Yagi, T. Yonemura, T. Nomura, N. Fujiwara, Y. Ichikawa, Y. Aoki, T. Saitoh, N. Amemiya, A. Ishiyama, and N. Hayakawa, "Model Cable Tests for a 275kV 3kA HTS Power Cable", IEEE Trans. Appl. Supercond., vol. 21, no. 3, pp. 976-979, 2011. https://doi.org/10.1109/TASC.2011.2117411
  2. J. F. Maguire, J. Yuan, W. Romanosky, F. Schmidt, R. Soika, S. Bratt, F. Durand, C. King, J. McNamara, and T. E. Welsh, "Progress and Status of a 2G HTS Power Cable to be Installed in the Long Island Power Authority (LIPA) Grid", IEEE Trans. Appl. Supercond., vol. 21, no. 3, pp. 961-966, 2011. https://doi.org/10.1109/TASC.2010.2093108
  3. J. W. Cho, J. H. Bae, H. J. Kim, K. D. Sim, S. H. Kim, H. M. Jang, C. Y. Lee, D. W. Kim, "Development of a Single-Phase 30m HTS Power Cable", Cryogenics, vol. 46, pp. 333-337, 2006. https://doi.org/10.1016/j.cryogenics.2005.11.025
  4. Y. Murakami, S. Mitsumoto, M. Fukuma, N. Hozumi, and M. Nagao, "Space Charge Formation and Breakdown in Polyethylene Influenced by the Interface with Semiconducting Electrodes", T. IEE Japan, vol. 120-A, pp. 930-935, 2000. https://doi.org/10.1541/ieejfms1990.120.10_930
  5. A. Bradwell, "Conduction in Polyethylene with Strong Electric Fields and the Effect of Pressing on the Electric Strength", Processing of I.E.E., vol. 18, pp. 247-254, 1971.
  6. D. S. Kwag, H. G. Cheon, J. H. Choi, H. J. Kim, J. W. Choi, and S.H. Kim, "Research on the Insulation Design of a 154kV Class HTS Power Cable and Termination", IEEE Trans. Appl. Supercond., vol. 17, no. 2, pp. 1938-1942, 2007.
  7. J. H. Choi, J. W. Choi, S. M. Baek, and S. H. Kim, "The Insulation Design of 154kV HTS Transformer and on Load Tap Changers", IEEE Trans. Appl. Supercond., vol. 19, no. 3, pp. 1972-1975, 2009 https://doi.org/10.1109/TASC.2009.2017755
  8. S. Hwangbo, D. S. Shin, D. H. Yun, and M. K. Han, "Effects of Space Charge on the Electrical Conduction Characteristics in a LDPE with Semi conductive Electrodes", Trans. KIEE Korea, vol. 46, no. 8, pp. 1240-1248, 1997.
  9. K. Tsuyuki, S. Washida, O. Tanda, T. Masuda, K. Kato, T. Nakajima, and S. Mukoyama, "Study on the Electrical Insulation of High-Tc Superconducting DC Power Cable", Cryogenic Engineering of Japan, vol. 35, no. 7, pp.350-356, 2000. https://doi.org/10.2221/jcsj.35.350
  10. T. Nakagawa, "Measurement of Space Charge Accumulation in PPLP", Proceedings of 13th International Conference on Dielectric Liquids (ICDL '99), Japan, pp.533-536, July 20-25, 1999.