Dependence of return voltage characteristics on change of insulation conductivity and polarization resistance

Author

Kozlovskis, Aldis

Author_Institution

Inst. of Power Eng., Riga Tech. Univ., Latvia

fYear

1999

fDate

6/21/1905 12:00:00 AM

Firstpage

103

Lastpage

106

Abstract

A demand for a reliable diagnostic method is growing by the increase of the age of equipment. The return voltage characteristics such as the maximum of return voltage, the initial slope of return voltage and the time to peak value dependencies on charging time are discussed in this paper. The analysis of these characteristics increases the information of the insulation properties of equipment. The increase of conductivity and decrease of polarization resistance are closely related with the ageing processes of insulation. The changes of these dielectric phenomena can be seen by the analysis of return voltage characteristics. The theoretical study of the polarization index particularly used for the assessment of insulation systems is given in paper

Keywords

ageing; electrical conductivity; insulation testing; polarisation; power apparatus; voltage measurement; HV equipment insulation; ageing processes; charging time; diagnostic method; dielectric phenomena; equipment insulation properties; insulation conductivity; polarization index; polarization resistance; return voltage characteristics; return voltage measurements; Conductivity; Dielectric loss measurement; Dielectric measurements; Dielectrics and electrical insulation; Electrical resistance measurement; Equivalent circuits; Loss measurement; Polarization; Power transformer insulation; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 1999. Proceedings

Conference_Location

Cincinnati, OH

ISSN

0362-2479

Print_ISBN

0-7803-5757-4

Type

conf

DOI

10.1109/EEIC.1999.826189

Filename

826189