Title :
Studies on the dielectric strength of transformer oil under oscillatory impulse voltages
Author :
Venkataseshaiah, C. ; Sarathi, R. ; Aleyas, M.V.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol., Madras, India
Abstract :
In this paper, the results of investigations carried out on the breakdown characteristics of transformer oil subjected to oscillatory impulse voltage (unidirectional and bidirectional) stresses in the frequency range of 10-100 kHz using a needle-plane electrode configuration are presented. For the purpose of comparison, experimental results obtained under AC, lightning and switching impulse voltages are also provided. The effect of gap spacing, frequency, field nonuniformity and polarity on the breakdown characteristics are discussed
Keywords :
electric breakdown; electric strength; impulse testing; insulation testing; power transformer insulation; power transformer testing; transformer oil; 10 to 100 kHz; AC impulse voltage; bidirectional stress; breakdown characteristics; dielectric strength; field nonuniformity; frequency; gap spacing; insulation breakdown testing; lightning impulse voltage; needle-plane electrode; oscillatory impulse voltages; polarity; switching impulse voltage; transformer oil testing; unidirectional stress; Breakdown voltage; Dielectric breakdown; Electric breakdown; Electrodes; Frequency; Lightning; Oil insulation; Petroleum; Power transformer insulation; Voltage-controlled oscillators;
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.1996.549405
