Title :
The influence of SF6 and SF6/N2 gas pressure to the breakdown performance of polyester film
Author :
Peihong, Zhang ; Guoli, Gong ; Guangyu, Dong ; Zhenhua, Dong
Author_Institution :
Dept. of Electr. Mater., Harbin Univ. of Sci. & Technol., China
Abstract :
SF6 has been widely used as the gas insulating medium in gas insulated transformers, and polyester film used as the turn insulation and other insulating materials. In this paper, the insulation strength of SF6/N2-film turn insulation is tested when the SF6 is replaced by SF6/N2 mixed gas, and also compared with that of SF6-film. The results show that the power frequency breakdown voltage and breakdown stress of SF6/N2-film is lower than that of SF6-film under the same pressure and for the same film thickness, the mean value of the former is about 91% of the latter. In order to reach the same level of turn insulation strength in the operation range, the gas pressure must be increased by 0.05 Mpa
Keywords :
SF6 insulation; electric breakdown; electric strength; gas insulated transformers; insulation testing; nitrogen; organic insulating materials; polymers; power transformer insulation; power transformer testing; transformer windings; SF6; SF6-N2; SF6/N2 film insulation; breakdown stress; film thickness; gas insulated transformer; insulation breakdown tests; insulation strength; polyester film; power frequency breakdown voltage; turn insulation; windings; Cable insulation; Copper; Dielectrics and electrical insulation; Electric breakdown; Frequency; Gas insulation; Insulation testing; Power transformer insulation; Sulfur hexafluoride; Temperature sensors;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549414
