Title :
Effect of temperature on surface discharge in oil
Author :
Niasar, M. Ghaffarian ; Clemence, R. ; Wang, X. ; Nikjoo, R. ; Edin, H.
Author_Institution :
Sch. of Electr. Eng., KTH R. Inst. of Technol., Stockholm, Sweden
Abstract :
In this paper surface discharge along the oil-pressboard interface was investigated. Surface discharges were measured both in time domain by means of an oscilloscope and as phase resolve patterns. The effect of temperature from 20 °C to 90 °C on surface discharge inception, extinction and surface flashover voltage were investigated. Trend of number and maximum magnitude of PD was compared for 20 °C and 90 °C over time. The effect of voltage rise and surface flashover on number and maximum magnitude of PD were investigated. The results show that PD inception voltage is lower for higher temperature but surface flashover voltage is higher for higher temperature. However for 90 °C the final damage due to surface discharge is much severe compared to 20 °C.
Keywords :
flashover; oscilloscopes; power transformer insulation; surface discharges; time-domain analysis; transformer oil; PD inception voltage; PD magnitude; oil surface discharge; oil-pressboard interface; oscilloscope; phase resolve patterns; surface discharge extinction; surface discharge inception; surface flashover; surface flashover voltage; temperature 20 degC to 90 degC; temperature effect; time domain; voltage rise; Discharges (electric); Flashover; Partial discharges; Surface discharges; Surface treatment; Temperature; Temperature measurement;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2012 Annual Report Conference on
Conference_Location :
Montreal, QC
Print_ISBN :
978-1-4673-1253-0
Electronic_ISBN :
0084-9162
DOI :
10.1109/CEIDP.2012.6378731
