Understanding the impacts of moisture and thermal ageing on transformer's insulation by dielectric response and molecular weight measurements

Saha, T. K. and Purkait, P. (2008) Understanding the impacts of moisture and thermal ageing on transformer's insulation by dielectric response and molecular weight measurements. IEEE Transactions On Dielectrics And Electrical Insulation, 15 2: 568-582. doi:10.1109/TDEI.2008.4483479


Author Saha, T. K.
Purkait, P.
Title Understanding the impacts of moisture and thermal ageing on transformer's insulation by dielectric response and molecular weight measurements
Journal name IEEE Transactions On Dielectrics And Electrical Insulation   Check publisher's open access policy
ISSN 1070-9878
Publication date 2008-04-01
Year available 2008
Sub-type Article (original research)
DOI 10.1109/TDEI.2008.4483479
Open Access Status DOI
Volume 15
Issue 2
Start page 568
End page 582
Total pages 15
Editor R. Hackam
Place of publication Piscataway, NJ
Publisher The Institute of Electrical and Electronics Engineers
Language eng
Subject C1
0906 Electrical and Electronic Engineering
850603 Energy Systems Analysis
Abstract Properties of oil and paper in a transformer degrade primarily due to thermal ageing and moisture ingress. Dielectric diagnostic tests, such as Recovery Voltage (RV), and Polarizations and Depolarization Current (PDC) measurement are currently being explored as potential tools for insulation condition assessment. A modern chemical analysis tool for paper molecular weight (MW) measurement, Gel Permeation Chromatography (GPC) or the more accurately described Size Exclusion Chromatography (SEC) promises to be useful in assessing ageing condition. However, the issue of separately assessing the impacts of ageing and moisture on oil and paper has been a key issue for many years. In the current research project, a series of experiments have been performed under controlled laboratory conditions with preset moisture content, and at controlled high temperature ageing. Whereas RV and PDC measurement results were found to be more sensitive to the moisture content of the oil and paper insulation, the MW distribution measurement by SEC provided a trend of insulation thermal ageing. This paper first provides a brief description of RVM, PDC and SEC procedures followed by a description of the experimental techniques adopted. Results are then analysed with the view of separately understanding the impacts of thermal ageing and moisture on the condition of oil and paper insulation in a transformer.
Keyword Transformer
Ageing
moisture
Thermal Ageing
Dielectric Response
molecular weight measurement
Engineering, Electrical & Electronic
condition monitoring
gel permeation chromatography
moisture content
moisture related degradation
molecular weight
polarization and depolarization current
return voltage
size exclusion chromatography
thermal ageing
transformer condition assessment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Sun, 05 Apr 2009, 18:51:55 EST by Donna Clark on behalf of School of Information Technol and Elec Engineering