FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics

G.M. Smith; A.S. Holmes-Smith; S.G. McMeekin

doi:10.1109/ICDL.2019.8796785

FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics

G.M. Smith, A.S. Holmes-Smith, S.G. McMeekin

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)
Publisher	IEEE
ISBN (Electronic)	9781728117188
ISBN (Print)	9781728117195
DOIs	https://doi.org/10.1109/ICDL.2019.8796785
Publication status	Published - 15 Aug 2019
Event	IEEE 20th International Conference on Dielectric Liquids - Roma, Italy Duration: 23 Jun 2019 → 27 Jun 2019 https://www.icdl2019.org/ (Link to conference website)

Publication series

Name	Proceedings of IEEE International Conference on Dielectric Liquids
Publisher	IEEE
ISSN (Print)	2153-3725
ISSN (Electronic)	2153-3733

Conference

Conference	IEEE 20th International Conference on Dielectric Liquids
Abbreviated title	IEEE ICDL 2019
Country/Territory	Italy
City	Roma
Period	23/06/19 → 27/06/19
Internet address	https://www.icdl2019.org/ (Link to conference website)

Keywords

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

Documents and Links

10.1109/ICDL.2019.8796785

Cite this

@inproceedings{90f0762386b04a48ae60ff6284398da7,

title = "FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics",

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.",

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

author = "G.M. Smith and A.S. Holmes-Smith and S.G. McMeekin",

note = "Acceptance and AAM requested. ST 29/04/21; IEEE 20th International Conference on Dielectric Liquids, IEEE ICDL 2019 ; Conference date: 23-06-2019 Through 27-06-2019",

year = "2019",

month = aug,

day = "15",

doi = "10.1109/ICDL.2019.8796785",

language = "English",

isbn = "9781728117195",

series = "Proceedings of IEEE International Conference on Dielectric Liquids",

publisher = "IEEE",

booktitle = "2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)",

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}

Smith, GM, Holmes-Smith, AS & McMeekin, SG 2019, FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics. in 2019 IEEE 20th International Conference on Dielectric Liquids (ICDL). Proceedings of IEEE International Conference on Dielectric Liquids, IEEE, IEEE 20th International Conference on Dielectric Liquids, Roma, Italy, 23/06/19. https://doi.org/10.1109/ICDL.2019.8796785

FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics. / Smith, G.M.; Holmes-Smith, A.S.; McMeekin, S.G.

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL). IEEE, 2019. (Proceedings of IEEE International Conference on Dielectric Liquids).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics

AU - Smith, G.M.

AU - Holmes-Smith, A.S.

AU - McMeekin, S.G.

N1 - Acceptance and AAM requested. ST 29/04/21

PY - 2019/8/15

Y1 - 2019/8/15

N2 - 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.

AB - 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.

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

U2 - 10.1109/ICDL.2019.8796785

DO - 10.1109/ICDL.2019.8796785

M3 - Conference contribution

SN - 9781728117195

T3 - Proceedings of IEEE International Conference on Dielectric Liquids

BT - 2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)

PB - IEEE

T2 - IEEE 20th International Conference on Dielectric Liquids

Y2 - 23 June 2019 through 27 June 2019

ER -

FTIR-spectroscopic and electrical analysis of thermally stressed liquid dielectrics

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Keywords

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