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

Volume

1

fYear

1996

fDate

16-19 Jun 1996

Firstpage

75

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on

Conference_Location

Montreal, Que.

ISSN

1089-084X

Print_ISBN

0-7803-3531-7

Type

conf

DOI

10.1109/ELINSL.1996.549286

Filename

549286