Title :
Studies of impulse creepage discharge in transformer oil
Author :
Nakao, Y. ; Itoh, Hayato ; Sakai, Y. ; Tagashira, H.
Author_Institution :
Dept. of Electr. & Electron. Eng., Muroran Inst. of Technol., Japan
fDate :
8/1/1991 12:00:00 AM
Abstract :
The propagation process of a creepage discharge on the surface of a solid insulator in transformer oil was investigated in detail when impulse voltages with various rates of rise Tf of the wave front are applied to a point electrode. The shape and size of the Schlieren figures agree well with dust figures. The propagation of density changes (steamer-like density changes) corresponds to the current and the charge waveform. The effect of Tf on their propagation is also discussed
Keywords :
electric breakdown of liquids; impulse testing; insulating oils; insulation testing; schlieren systems; surface discharges; Schlieren figures; charge waveform; creepage discharge; current waveform; dust figures; impulse voltages; insulating surface; point electrode; solid insulator; steamer-like density changes; transformer oil; wave front; Delay effects; Dielectrics and electrical insulation; Electrodes; Oil insulation; Optical surface waves; Power transformer insulation; Pulse amplifiers; Solids; Surface discharges; Voltage;
Journal_Title :
Electrical Insulation, IEEE Transactions on
