Factors affecting polarization and depolarization current measurements on insulation of transformers

Polarization and depolarization current measurements are promising on-site, off-line, non-destructive, non-invasive diagnostic tool for condition assessment of paper-oil insulation of transformers. Interpretation of the results of polarization and depolarization current is complex and hence not prac...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2017-02, Vol.24 (1), p.619-629
Main Authors: Flora, S. Daisy, Divekar, Mohan S., Rajan, J. Sundara
Format: Article
Language:English
Subjects:
Current measurement
Delays
Moisture
noise
Oil insulation
paper-oil insulation
polarization and depolarization current
Power transformer insulation
Resistance
Resistors
temperature
transformer
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Summary:Polarization and depolarization current measurements are promising on-site, off-line, non-destructive, non-invasive diagnostic tool for condition assessment of paper-oil insulation of transformers. Interpretation of the results of polarization and depolarization current is complex and hence not practiced as a routine diagnostic method for condition monitoring of transformers. This paper discusses various factors affecting polarization and depolarization current measurements with a deeper insight into the theoretical and practical aspects of this technique. Some of the concerns of PDC measurement are explained with support from simulation and experimental studies on paper oil insulation of a laboratory model transformer. Few case studies are discussed to highlight the difficulties in interpretation of results.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2016.005944