Investigation Of Polarization And Depolarization: Current Measurements For The Assessment Of Oil-Paper Insulation Of Aged Transformers

Saha, Tapan K. and Purkait, Prithwiraj (2004) Investigation Of Polarization And Depolarization: Current Measurements For The Assessment Of Oil-Paper Insulation Of Aged Transformers. IEEE Transactions on Dielectrics and Electrical Insulation, 11 1: 144-154. doi:10.1109/TDEI.2004.1266329

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Author Saha, Tapan K.
Purkait, Prithwiraj
Title Investigation Of Polarization And Depolarization: Current Measurements For The Assessment Of Oil-Paper Insulation Of Aged Transformers
Journal name IEEE Transactions on Dielectrics and Electrical Insulation   Check publisher's open access policy
ISSN 1070-9878
Publication date 2004-02-01
Sub-type Article (original research)
DOI 10.1109/TDEI.2004.1266329
Open Access Status File (Author Post-print)
Volume 11
Issue 1
Start page 144
End page 154
Total pages 11
Place of publication Piscataway, NJ
Publisher The Institute of Electrical and Electronics Engineers
Language eng
Subject 290901 Electrical Engineering
C1
660301 Electricity transmission
660304 Energy systems analysis
Abstract Moisture and ageing strongly influence the dielectric properties of oilrpaper insulation system of power transformer. Moisture measurement in oil sample generally gives inconclusive information since oilrpaper moisture equilibrium is temperature dependent and takes a long time to be in equilibrium. Direct moisture measurement of paper sample is not practicable for in-service transformers. The measurement and evaluation of the 'dielectric response'and conductivity is one possible way of diagnosing a transformer insulation condition. In a recent research project, polarization and depolarization current measurement has been used for assessing the condition of oilrpaper insulation. The polarization and depolarization current PDC analysis is a non-destructive dielectric testing method for determining the conductivity and moisture content of insulation materials in a transformer. On the basis of this analysis it is possible to take further actions like oilrefurbishment, drying or replacement of the winding of the transformer. This paper presents a description of the PDC technique with the physical and mathematical background and some results of PDC measurements on several transformers. Analyses and interpretation of the field test data are also presented in this paper.
Keyword transformer
oil-paper insulation
aging
moisture content
dielectric response
conductivity
polarization current
depolarization current
Power Transformer
Degradation
Engineering, Electrical & Electronic
Physics, Applied
Q-Index Code C1
Additional Notes Originally published as Saha, Tapan K. and Purkait, Prithwiraj (2004) Investigation Of Polarization And Depolarization: Current Measurements For The Assessment Of Oil-Paper Insulation Of Aged Transformers. IEEE Transactions on Dielectrics and Electrical Insulation 11(1):144-154. Copyright 2004 IEEE. All rights reserved.

 
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Created: Mon, 21 Feb 2005, 10:00:00 EST by Tapan Kumar Saha on behalf of Library Technology Service