Title :
The characteristics of insulation resistance of transformers
Author :
Naiqing Wang ; Fa Chang
Author_Institution :
Electr. Power Res. Inst., Beijing
Abstract :
It has been demonstrated that a double-layered dielectric model could approximately describe and explain the absorption phenomena of the oil-paper insulation of a transformer after data measured with a Megger-meter was fitted to curves. Some insulation is shown to have high insulation resistance but low absorption ratio (R60"/R15") owing to its long absorption process. In this case, the polarization index (R10\´/R1\´) is recommended as a better criterion
Keywords :
composite insulating materials; insulation testing; maintenance engineering; organic insulating materials; power transformers; transformer insulation; absorption phenomena; absorption ratio; characteristics; double-layered dielectric model; insulation resistance; megohmmeter measurements; oil-paper insulation; polarization index; Computer errors; Current measurement; Dielectric measurements; Dielectrics and electrical insulation; Electrical resistance measurement; Equations; Equivalent circuits; Oil insulation; Power transformer insulation; Temperature;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of
Conference_Location :
Beijing
DOI :
10.1109/ICPADM.1988.38434
