Next Article in Journal
A Novel Grouping Method for Lithium Iron Phosphate Batteries Based on a Fractional Joint Kalman Filter and a New Modified K-Means Clustering Algorithm
Previous Article in Journal
Software-Based Wireless Power Transfer Platform for Various Power Control Experiments
Article Menu

Export Article

Open AccessArticle
Energies 2015, 8(8), 7690-7702; doi:10.3390/en8087690

Measurement of the Relative Free Radical Content of Insulating Oils of Petroleum Origin

1
Canada Research Chair on Insulating Liquids and Mixed Dielectrics for Electrotechnology (ISOLIME), University of Quebec at Chicoutimi, 555 Boulevard de l'université, Chicoutimi, QC G7H 2B1, Canada
2
Insoil Canada Ltd., 231 Hampshire Place NW, Calgary, AB T3A 4Y7, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Paul L. Chen
Received: 31 May 2015 / Revised: 15 July 2015 / Accepted: 21 July 2015 / Published: 28 July 2015
View Full-Text   |   Download PDF [395 KB, uploaded 28 July 2015]   |  

Abstract

Oil/paper insulation degradation in transformers involves chemical and physical changes in the materials. Some of the chemical reactions involve very reactive intermediates called free radicals. Free radicals play a major role in a wide variety of ageing processes. The detection of these reactive species in oil may, in principle, provide useful information for monitoring oil degradation. This manuscript details a laboratory technique, which determines the relative content of free radicals in insulating oils of petroleum origin by a spectrophotometric method. Free radicals may be formed in oils under operating or test conditions. The procedure enables the determination of the relative concentration of free radicals, which can act as the precursors of decay products such as charge carriers, oxidized molecules, as well as polymerization products. The technique involves using a reactive free radical reagent, 2,2-diphenyl-1-picrylhydrazyl (DPPH), added to oil to assess free radical concentration. This method is applicable to new, reclaimed, or used oils as well as naturally or artificially oxidized oil (the cause of aging can be chemical, physical, or electrical). In this contribution, free radicals were assessed following electrical discharge application in oil. View Full-Text
Keywords: free radicals; insulating oil; reaction kinetics free radicals; insulating oil; reaction kinetics
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).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Fofana, I.; Sabau, J.; Betie, A. Measurement of the Relative Free Radical Content of Insulating Oils of Petroleum Origin. Energies 2015, 8, 7690-7702.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top