FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Mineral oils are employed as liquid dielectric insulators in many high voltage transformers. It is recognised that the dielectric properties of these oils degrade over time with continued exposure to high voltages and thermal stress. This breakdown can be monitored using FTIR spectroscopy or electrical techniques. In this work the mineral oils have been thermally stressed by exposure to 120°C over a prolonged time period with changes to the electrical breakdown voltage and FTIR spectra measured at frequent intervals. Different samples of oil were prepared with some exposed to Kraft paper, copper or a combination of the two. The ratio of oil: copper: Kraft paper was consistent with that commonly found in transformers. Results show that the growth of the carboxylic acid peak can be correlated with a total acid number (TAN) through a calibration process which is less time consuming, won't overestimate TAN and is an alternative to titration.
Original languageEnglish
Title of host publication2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)
PublisherIEEE
ISBN (Electronic)9781728117188
ISBN (Print)9781728117195
DOIs
Publication statusPublished - 15 Aug 2019
EventIEEE 20th International Conference on Dielectric Liquids - Roma, Italy
Duration: 23 Jun 201927 Jun 2019
https://www.icdl2019.org/ (Link to conference website)

Publication series

NameProceedings of IEEE International Conference on Dielectric Liquids
PublisherIEEE
ISSN (Print)2153-3725
ISSN (Electronic)2153-3733

Conference

ConferenceIEEE 20th International Conference on Dielectric Liquids
Abbreviated titleIEEE ICDL 2019
Country/TerritoryItaly
CityRoma
Period23/06/1927/06/19
Internet address

Keywords

  • dielectric liquids , electric breakdown , Fourier transform spectra , infrared spectra , minerals , paper , power transformer insulation , thermal stresses , transformer oil

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