Title :
Studies on compatibility of silicone oil with pressboard insulation
Author :
Viswanatha, C. ; Dwarakanath, K. ; Kumar, V. Sathyanaga
Author_Institution :
Central Power Res. Inst., Bangalore, India
Abstract :
The paper oil insulation system is an integral and essential part of large power transformers. The failure of power transformers under combined stresses and fast transients has made it necessary to look for an alternate liquid insulant. In this study, silicone oil was investigated for use as a liquid insulant. The samples of pressboard are subjected to dielectric tests like electric strength, surface electric strength under AC, DC and combined AC/DC voltages, dielectric dissipation factor and others. The variation of dielectric constant, dissipation factor of silicone oil has been studied over a range of frequency. The surface electric strengths of cellulosic insulation with silicone oil and with mineral oils have been compared. Some very interesting results on the performance of silicone oils have been observed and discussed
Keywords :
electric strength; insulation testing; power transformer insulation; power transformer testing; silicone insulation; transformer oil; dielectric constant; dielectric dissipation factor; dielectric tests; dissipation factor; electric strength; fast transients; paper oil insulation system; power transformers; pressboard insulation; silicone oil compatibility; stresses; surface electric strength; Dielectric constant; Dielectrics and electrical insulation; Frequency; Oil insulation; Petroleum; Power transformer insulation; Power transformers; Stress; Testing; Voltage;
Conference_Titel :
Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on
Conference_Location :
Himeji
Print_ISBN :
4-88686-053-2
DOI :
10.1109/ISEIM.2001.973816
