Title :
A preliminary study of oil-polypropylene insulating system
Author :
Xiao-Chun, Chi ; Ding Li-Jian ; Jia-xiang, Yang
Author_Institution :
Dept. of Electr. Mater. Eng., Harbin Inst. of Electr. Technol., Harbin, China
Abstract :
In this paper, the creeping discharge of oil-polypropylene insulating systems has been studied using an experimental model with flowing oil under AC voltage. The AC creeping discharge inception voltage of the oil-polypropylene system has been tested under varied conditions. According to the experimental results, all of the oil temperature, the oil flow rate and the position of polypropylene film can influence the AC creeping discharge inception voltage of the oil-polypropylene system. The AC inception voltage of this system increases along with the increase of oil temperature and oil flow rate. Moreover, the AC inception voltage is higher at a position near to the oil entrance than that at a position far from the oil entrance. Considering the experimental results, a new composite insulating system is put forward for reducing the negative effects of streaming electrification in large power transformers with forced-oil cooling systems
Keywords :
composite insulating materials; electric breakdown; insulation testing; organic insulating materials; polymer films; power transformer insulation; power transformer testing; transformer oil; AC creeping discharge inception voltage; composite insulating system; forced-oil cooling systems; insulation breakdown tests; oil flow rate; oil temperature; oil-polypropylene insulating system; polypropylene film; power transformers; streaming electrification; Circuits; Dielectric devices; Dielectrics and electrical insulation; Electrodes; Oil insulation; Petroleum; System testing; Temperature; Valves; Voltage;
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.1996.549454
