Details
| Original language | English |
|---|---|
| Title of host publication | 2019 IEEE 20th International Conference on Dielectric Liquids, ICDL 2019 |
| Subtitle of host publication | Proceedings |
| Number of pages | 4 |
| ISBN (electronic) | 978-1-7281-1718-8 |
| Publication status | Published - Jun 2019 |
| Event | 20th IEEE International Conference on Dielectric Liquids, ICDL 2019 - Roma, Italy Duration: 23 Jun 2019 → 27 Jun 2019 |
Publication series
| Name | Proceedings of IEEE International Conference on Dielectric Liquids |
|---|---|
| Volume | 2019-June |
| ISSN (Print) | 2153-3725 |
| ISSN (electronic) | 2153-3733 |
Abstract
Under normal operating conditions hermetically sealed power transformers undergo load cycles resulting in pressure and temperature variation. With decreasing pressure, the dissolved gases diffuse out of the insulation liquid and accumulate in gas phase. This gas leakage may be diagnosed as a fault in transformer by monitoring systems. However, it should be differentiated from a fault decomposing the insulation material. It is known that the conventional insulating liquid exhibit to some extent a different degassing behavior in comparison to the new alternatives. In addition to the erroneous fault indication, the gassing properties as well as the solubility of gasses influence the accuracy of the dissolved gas analysis. By determining the concentration of key gases and specific ratios among them, the type of fault can be classified. The gassing behavior of various liquids depends on many factors, such as pressure, temperature and of course the type of the insulation liquid. Therefore, the specification of the gassing and degassing behavior of new alternative insulating fluids is of critical importance.In this study, two different test vessels were built to determine the different gassing characteristics under laboratory conditions. On the one hand a simple arrangement with glass vessels was constructed to represent a kind of gas trap and on the other hand a scaled model of the transformer tank with a long diffusion way and a small contact to the gas phase above the liquid. The tests were performed at different pressure and temperature values by using a vacuum oven. To analyze the influence of these parameters on the gassing behavior, the pressure was kept at three different values: 800 mbar, 900 mbar and 950 mbar. Furthermore, the measurements were performed at various temperatures namely, 40C and 80C. A synthetic ester, an uninhibited mineral oil and a gas-to-liquid (GtL) oil were investigated. Before and after each test a dissolved gas analysis was performed. Moreover, the time, in which gas bubbles appeared, were registered.
Keywords
- DGA, Degassing, Dissolved gas, Ester, Gassing, GtL oil, Mineral oil, Undissolved gas
ASJC Scopus subject areas
- Chemistry(all)
- Electrochemistry
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
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2019 IEEE 20th International Conference on Dielectric Liquids, ICDL 2019: Proceedings. 2019. 8796796 (Proceedings of IEEE International Conference on Dielectric Liquids; Vol. 2019-June).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Investigation on Gassing Behavior of Various Insulation Liquids in Power Transformers
AU - Homeier, Kristin Janine
AU - Imani, Mohammad Taghi
AU - Kuhnke, Moritz
AU - Kinkeldey, Tobias
AU - Werle, Peter
PY - 2019/6
Y1 - 2019/6
N2 - Under normal operating conditions hermetically sealed power transformers undergo load cycles resulting in pressure and temperature variation. With decreasing pressure, the dissolved gases diffuse out of the insulation liquid and accumulate in gas phase. This gas leakage may be diagnosed as a fault in transformer by monitoring systems. However, it should be differentiated from a fault decomposing the insulation material. It is known that the conventional insulating liquid exhibit to some extent a different degassing behavior in comparison to the new alternatives. In addition to the erroneous fault indication, the gassing properties as well as the solubility of gasses influence the accuracy of the dissolved gas analysis. By determining the concentration of key gases and specific ratios among them, the type of fault can be classified. The gassing behavior of various liquids depends on many factors, such as pressure, temperature and of course the type of the insulation liquid. Therefore, the specification of the gassing and degassing behavior of new alternative insulating fluids is of critical importance.In this study, two different test vessels were built to determine the different gassing characteristics under laboratory conditions. On the one hand a simple arrangement with glass vessels was constructed to represent a kind of gas trap and on the other hand a scaled model of the transformer tank with a long diffusion way and a small contact to the gas phase above the liquid. The tests were performed at different pressure and temperature values by using a vacuum oven. To analyze the influence of these parameters on the gassing behavior, the pressure was kept at three different values: 800 mbar, 900 mbar and 950 mbar. Furthermore, the measurements were performed at various temperatures namely, 40C and 80C. A synthetic ester, an uninhibited mineral oil and a gas-to-liquid (GtL) oil were investigated. Before and after each test a dissolved gas analysis was performed. Moreover, the time, in which gas bubbles appeared, were registered.
AB - Under normal operating conditions hermetically sealed power transformers undergo load cycles resulting in pressure and temperature variation. With decreasing pressure, the dissolved gases diffuse out of the insulation liquid and accumulate in gas phase. This gas leakage may be diagnosed as a fault in transformer by monitoring systems. However, it should be differentiated from a fault decomposing the insulation material. It is known that the conventional insulating liquid exhibit to some extent a different degassing behavior in comparison to the new alternatives. In addition to the erroneous fault indication, the gassing properties as well as the solubility of gasses influence the accuracy of the dissolved gas analysis. By determining the concentration of key gases and specific ratios among them, the type of fault can be classified. The gassing behavior of various liquids depends on many factors, such as pressure, temperature and of course the type of the insulation liquid. Therefore, the specification of the gassing and degassing behavior of new alternative insulating fluids is of critical importance.In this study, two different test vessels were built to determine the different gassing characteristics under laboratory conditions. On the one hand a simple arrangement with glass vessels was constructed to represent a kind of gas trap and on the other hand a scaled model of the transformer tank with a long diffusion way and a small contact to the gas phase above the liquid. The tests were performed at different pressure and temperature values by using a vacuum oven. To analyze the influence of these parameters on the gassing behavior, the pressure was kept at three different values: 800 mbar, 900 mbar and 950 mbar. Furthermore, the measurements were performed at various temperatures namely, 40C and 80C. A synthetic ester, an uninhibited mineral oil and a gas-to-liquid (GtL) oil were investigated. Before and after each test a dissolved gas analysis was performed. Moreover, the time, in which gas bubbles appeared, were registered.
KW - DGA
KW - Degassing
KW - Dissolved gas
KW - Ester
KW - Gassing
KW - GtL oil
KW - Mineral oil
KW - Undissolved gas
UR - http://www.scopus.com/inward/record.url?scp=85071506679&partnerID=8YFLogxK
U2 - 10.1109/icdl.2019.8796796
DO - 10.1109/icdl.2019.8796796
M3 - Conference contribution
SN - 978-1-7281-1719-5
T3 - Proceedings of IEEE International Conference on Dielectric Liquids
BT - 2019 IEEE 20th International Conference on Dielectric Liquids, ICDL 2019
T2 - 20th IEEE International Conference on Dielectric Liquids, ICDL 2019
Y2 - 23 June 2019 through 27 June 2019
ER -