A new proposal to determine the humidity correction factor for lightning impulse tests and application to commercial configurations

Author

de Salles, C. ; Pennacchi, J.P. ; Martinez, M.L.B.

Author_Institution

Power Syst. Dept., Fed. Univ. of Itajuba, Minas Gerais, Brazil

Volume

2

fYear

2003

fDate

23-26 June 2003

Abstract

The correction of the humidity effects of the results of lightning impulse tests is carried out according to a standard international procedure. However, this procedure is not suitable to application to short distance air gaps, common on of medium voltage apparatus. This paper deals with a new proposal to define a humidity correction procedure suitable to application on medium voltage apparatus. The developed procedure is based in testing results obtained with sphere - sphere and rod - rod gaps and has been applied, with some degree of success, to commercial systems. All present data were obtained at the high voltage laboratory of Federal University at Itajuba using a 450 kV - 1.25 kJ impulse voltage generator.

Keywords

air gaps; atmospheric humidity; impulse testing; lightning; pulse generators; statistical analysis; 1.25 kJ; 450 kV; Federal University; Itajuba; air gaps; atmospheric correction factor; commercial systems; high voltage laboratory; humidity correction factor; impulse voltage generator; lightning impulse tests; medium voltage apparatus; rod - rod gaps; sphere - sphere gaps; statistical methods; Electrodes; Humidity; IEC standards; Impulse testing; Insulation; Laboratories; Lightning; Medium voltage; Proposals; System testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Tech Conference Proceedings, 2003 IEEE Bologna

Print_ISBN

0-7803-7967-5

Type

conf

DOI

10.1109/PTC.2003.1304654

Filename

1304654