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Energies 2016, 9(5), 367; doi:10.3390/en9050367

Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

1
Département Génie Électrique et Électronique, Institut National Polytechnique Houphouët Boigny (INP-HB), BP 1093 Yamoussoukro, Ivory Coast
2
Research Chair on the Aging of Power Network Infrastructure (ViAHT), Université du Québec à Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, QC G7H 2B1, Canada
3
Ecole Centrale de Lyon, Université de Lyon, Ampère CNRS UMR 5005, 36 Avenue Guy de Collongue, 69134 Ecully, France
*
Author to whom correspondence should be addressed.
Academic Editor: Enrico Sciubba
Received: 23 March 2016 / Revised: 23 April 2016 / Accepted: 3 May 2016 / Published: 13 May 2016
(This article belongs to the Special Issue Power Transformer Diagnostics, Monitoring and Design Features)
View Full-Text   |   Download PDF [864 KB, uploaded 13 May 2016]   |  

Abstract

A power transformer outage has a dramatic financial consequence not only for electric power systems utilities but also for interconnected customers. The service reliability of this important asset largely depends upon the condition of the oil-paper insulation. Therefore, by keeping the qualities of oil-paper insulation system in pristine condition, the maintenance planners can reduce the decline rate of internal faults. Accurate diagnostic methods for analyzing the condition of transformers are therefore essential. Currently, there are various electrical and physicochemical diagnostic techniques available for insulation condition monitoring of power transformers. This paper is aimed at the description, analysis and interpretation of modern physicochemical diagnostics techniques for assessing insulation condition in aged transformers. Since fields and laboratory experiences have shown that transformer oil contains about 70% of diagnostic information, the physicochemical analyses of oil samples can therefore be extremely useful in monitoring the condition of power transformers. View Full-Text
Keywords: power transformers; insulating oil/paper; diagnostics; color/visual examination; particle count; inhibitor content; moisture; DGA; acidity; interfacial tension; viscosity; DP; furan; HPLC; gas chromatography-mass spectrometry coupling; FTIR spectroscopy; UV/visible spectroscopy; dissolved decay products; turbidity; methanol; free radicals power transformers; insulating oil/paper; diagnostics; color/visual examination; particle count; inhibitor content; moisture; DGA; acidity; interfacial tension; viscosity; DP; furan; HPLC; gas chromatography-mass spectrometry coupling; FTIR spectroscopy; UV/visible spectroscopy; dissolved decay products; turbidity; methanol; free radicals
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

N’cho, J.S.; Fofana, I.; Hadjadj, Y.; Beroual, A. Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers. Energies 2016, 9, 367.

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