Diagnosis of Moisture in Oil/Paper Distribution Cables, Part I: Estimation of Moisture Content Using Frequency Domain Spectroscopy

Author

Neimanis, Roberts ; Eriksson, Roland

Author_Institution

Programma Electric AB; Royal Institute of Technology

Volume

22

Issue

9

fYear

2002

Firstpage

59

Lastpage

59

Abstract

Dielectric spectroscopy (dielectric response measurements) has been applied for nondestructive estimation of humidity in oil-paper cable insulation. The experiments have been based upon two field-aged cables, 20 and 50 years old. Paper samples from these cables have been characterized and subjected to environments with differeat relative humidity. Dielectric loss and capacitance have been measured in a frequency range 1 mHz to 1 kHz and related to the moisture content determined by Karl Fisher titration. A method has been verified where the moisture content is correlated to the minimum value of loss tangent (tans). Field measurements have been performed where the method has been applied to estimate the moisture content in the distribution cables.

Keywords

Cable insulation; Dielectric loss measurement; Dielectric measurements; Dielectrics and electrical insulation; Electrochemical impedance spectroscopy; Frequency domain analysis; Frequency estimation; Humidity measurement; Moisture measurement; Petroleum; Karl Fischer titration; Mass impregnated cable; dielectric response; moisture content; oil paper insulation;

fLanguage

English

Journal_Title

Power Engineering Review, IEEE

Publisher

ieee

ISSN

0272-1724

Type

jour

DOI

10.1109/MPER.2002.4312592

Filename

4312592