Title :
Surface flashover strength of different insulating materials in N 2-SF6 gas mixtures under combined AC/DC voltages
Author :
Rajan, J. Sundara ; Dwarakanath, K. ; Srinivasan, N.
Author_Institution :
Central Power Res. Inst., Bangalore, India
Abstract :
Performance of insulating spacers in SF6-N2 gas mixture will be an important design factor in deciding the choice of spacer materials. In this study, 5 different polymers have been comparatively evaluated for surface flashover strengths in SF6-N2 gas mixtures of different proportions. The effect of AC, DC and combined AC/DC voltages on these spacer materials has been discussed. Compatibility of two different materials in terms of flashover behavior is also discussed. Though cycloaliphatic resin spacers show good performance, other spacer materials have distinct advantages in terms of surface tracking, bulk failure, and breakdown under combined and composite AC/DC voltages
Keywords :
SF6 insulation; flashover; insulation testing; nitrogen; polymers; surface discharges; N2-SF6; SF6-N2 gas mixture insulating spacers; bulk failure; combined AC/DC voltages; cycloaliphatic resin spacers; design factor; flashover behavior; insulating performance; insulation breakdown testing; materials compatibility; surface flashover strength; surface tracking; Breakdown voltage; Cable insulation; Composite materials; Conducting materials; Conductors; Contamination; Dielectrics and electrical insulation; Flashover; Gas insulation; Sulfur hexafluoride;
Conference_Titel :
Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on
Conference_Location :
Himeji
Print_ISBN :
4-88686-053-2
DOI :
10.1109/ISEIM.2001.973641
