Title :
Dielectric characteristic of insulating paper - Ice composite material in liquid nitrogen
Author :
Kawashima, T. ; Kunmoto, M. ; Murakami, Yasutaka ; Nagao, Masaru
Author_Institution :
Toyohashi Univ. of Technol., Toyohashi, Japan
Abstract :
Paper-liquid nitrogen (LN2) composite system has been used as one of the insulating systems of the high-temperature superconducting cable. In this system, partial discharge may occur inside the N2 gas bubbles due to the gasification of LN2 in the paper. We have been suggesting the paper-ice composite material as one of the candidates for the insulating system with LN2 in high-temperature superconducting cables. The paper-ice composite material is an insulating paper filled with ice and it could inhibit the partial discharge inside the microscopic N2 gas bubbles remained in the paper. This research investigated capacitance and dielectric loss tangent of the paper-ice composite material with changing field strength. Finally, we clarified that the paper-ice composite material could provide lower capacitance system to paper-LN2 composite insulating system for high temperature superconducting cables.
Keywords :
bubbles; composite insulating materials; dielectric losses; high-temperature superconductors; nitrogen; paper; partial discharges; superconducting cables; N2; capacitance system; dielectric characteristic; dielectric loss tangent; field strength; high-temperature superconducting cable; insulating paper; insulating systems; liquid nitrogen; microscopic gas bubbles; paper-LN2 composite insulating system; paper-ice composite material; paper-liquid nitrogen composite system; partial discharge; capacitance; dielectric loss tangent; liquid nitrogen; paper-ice composite material;
Conference_Titel :
Electrical Insulating Materials (ISEIM), Proceedings of 2011 International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-4-88686-074-3
DOI :
10.1109/ISEIM.2011.6826362
