Title :
Light emission study in transformer oil and along oil/cellulose interface using a spark-gap system
Author :
Liu, Rongsheng ; Jaksts, Albert ; Walfridsson, Lars
Author_Institution :
ABB Corp. Res., Vasteras, Sweden
Abstract :
Interfaces between oil and oil-impregnated-pressboard are known to weaken insulation system strength. The work here describes differences in the observed discharges in transformer oils and along oil/oil-impregnated-pressboard interfaces. Oil breakdown in a uniform electric field was initiated by triggering a spark gap either at the anode or at the cathode using a liquid trigatron. Light emission during the breakdown processes was detected using a photomultiplier tube. Breakdown voltage, time to breakdown, streamer propagation speed and polarity effect were seen to differ in a transformer oil and along an oil/oil-impregnated pressboard interface
Keywords :
anodes; cathodes; composite insulating materials; discharges (electric); gas-discharge tubes; insulation testing; optical variables measurement; photomultipliers; power transformer insulation; power transformer testing; spark gaps; transformer oil; anode; breakdown voltage; cathode; discharges; insulation system strength weakening; light emission study; liquid trigatron; oil breakdown; oil-impregnated-pressboard; oil/cellulose interface; oil/oil-impregnated-pressboard interfaces; photomultiplier tube; polarity effect; spark gap triggering; spark-gap system; streamer propagation speed; time to breakdown; transformer oil; uniform electric field;
Conference_Titel :
Electrical Insulation Conference, 1997, and Electrical Manufacturing & Coil Winding Conference. Proceedings
Conference_Location :
Rosemont, IL
Print_ISBN :
0-7803-3959-2
DOI :
10.1109/EEIC.1997.651192
