Investigations of temperature effects on the dielectric response measurements of transformer oil-paper insulation system

Saha, T. K. and Purkait, P. (2008) Investigations of temperature effects on the dielectric response measurements of transformer oil-paper insulation system. IEEE Transactions on Power Delivery, 23 1: 252-260. doi:10.1109/TPWRD.2007.911123


Author Saha, T. K.
Purkait, P.
Title Investigations of temperature effects on the dielectric response measurements of transformer oil-paper insulation system
Journal name IEEE Transactions on Power Delivery   Check publisher's open access policy
ISSN 0885-8977
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1109/TPWRD.2007.911123
Open Access Status DOI
Volume 23
Issue 1
Start page 252
End page 260
Total pages 9
Editor R. Iravani
Place of publication USA
Publisher IEEE Power and Energy Society
Language eng
Subject C1
0906 Electrical and Electronic Engineering
850603 Energy Systems Analysis
Abstract Dielectric testing techniques, in both time and frequency domains, are currently widely used by power utilities for assessment of the condition of transformer oil-paper insulation systems. However, it has been reported that results of these tests are highly influenced by the operating temperature during measurements. The distribution, migration and equilibrium of moisture between oil and paper in a complicated insulation system is highly temperature dependent. It requires adequate experience and proper understanding to interpret the dielectric response results in the presence of temperature variations and thermal instability. Proper analysis of the dielectric test result is only possible with an understanding of the physical behavior of the insulation system in response to temperature. A circuit model, which describes the dielectric behavior of the transformers main insulation system, has been investigated in this paper. The values of the parameters of the model have been identified from the dielectric tests. A correlation has been observed between the operating temperature and the equivalent model parameters that can be used as additional information for better interpretation of the dielectric test results. This paper thus reports a detailed study on the effects of temperature on dielectric measurements of a transformer under controlled laboratory conditions. Some results of practical on-site testing are also presented to demonstrate the possibility of errors that may be introduced in dielectric test results analysis unless temperature effects are taken into consideration.
Keyword dielectric response
Oil-paper Insulation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Sun, 05 Apr 2009, 18:45:47 EST by Donna Clark on behalf of School of Information Technol and Elec Engineering