Dielectric behavior of insulating liquids at very low frequency

authored by

Amir Abbas Shayegani Akmal, H. Borsi, E. Gockenbach, V. Wasserberg, H. Mohseni

Abstract

Dielectric spectroscopy in the wide frequency range of 1 mHz to 1 kHz has been used to study the polarization and conduction phenomena in insulating liquids. The dielectric spectroscopy of mineral oil and ester oil at different conditions, i.e. temperatures and electric fields, has been measured. It came out that at low frequencies, space charge polarization changes the permittivity of insulating liquid and at very low frequencies, the consideration of a RC parallel model for the dielectric behavior of insulating liquids is not adequate. The results indicate that the permittivity of insulating liquid increases with aging duration and therefore it can be used as a diagnosis parameter for insulating liquids. The calculation of the activation energy of the conduction process shows that consideration of single activation energy for compensation of temperature effect on dielectric loss for dielectric spectroscopy in the wide frequency range is not perfect.

Organisation(s)

High Voltage Engineering and Asset Management Section (Schering Institute)

External Organisation(s)

University of Tehran

Type

Article

Journal

IEEE Transactions on Dielectrics and Electrical Insulation

Volume

13

Pages

532-538

No. of pages

7

ISSN

1070-9878

Publication date

06.2006

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electrical and Electronic Engineering

Electronic version(s)

https://doi.org/10.1109/TDEI.2006.1657965 (Access: Closed)