Title :
A study of phase angle distribution of partial discharges in oil pressboard insulation systems
Author :
Raja, E. ; Narayanachar, M.N. ; Nema, R.S.
Author_Institution :
Dept. of High Voltage Eng., Indian Inst. of Sci., Bangalore, India
Abstract :
In electrical power transformers, composite insulation consisting of oil-pressboard insulation is widely used. For optimum design of such insulation systems, partial discharge (PD) behaviour is an important design criterion. A computer-aided PD measuring system which permits a time sequential data acquisition and phase resolved pulse height analysis has been developed. Using this system, PD in a representative oil-pressboard system has been measured. The effect of stress level, their duration and the test procedure on the discharges have been studied. The discharge data is analysed using Gumbel and Weibull statistics. An attempt is made to correlate the Weibull and derived PD parameters of each phase with their counter-parts in the cycle
Keywords :
Weibull distribution; automatic test equipment; data acquisition; electric breakdown; insulation testing; paper; partial discharges; power transformer insulation; power transformer testing; transformer oil; Gumbel statistics; Weibull statistics; composite insulation; computer-aided PD measuring system; design criterion; discharge data; electrical power transformers; insulation breakdown tests; oil pressboard insulation systems; partial discharges; phase angle distribution; phase resolved pulse height analysis; test automation; time sequential data acquisition; Dielectrics and electrical insulation; Oil insulation; Partial discharge measurement; Partial discharges; Petroleum; Phase measurement; Power transformer insulation; Power transformers; Pulse measurements; Time measurement;
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.1996.549286
