Details
| Original language | English |
|---|---|
| Title of host publication | 2019 IEEE 20th International Conference on Dielectric Liquids, ICDL 2019 |
| Subtitle of host publication | Proceedings |
| Publisher | IEEE Computer Society |
| Number of pages | 4 |
| ISBN (electronic) | 978-1-7281-1718-8 |
| ISBN (print) | 978-1-7281-1719-5 |
| 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 - IEEE International Conference on Dielectric Liquids |
|---|---|
| Volume | 2019-June |
| ISSN (Print) | 2153-3725 |
| ISSN (electronic) | 2153-3733 |
Abstract
The formation of solid wax-like ageing products in mineral oil under high voltage stress is known for almost a century. It was observed in oil-impregnated cables, bushings and capacitors. Its formation was generally attributed to high field strength and partial discharges. Since these types of equipment do not rely on oil flow for cooling the wax formation was seen as a sign of wear and not by itself as threat to the equipment.With the improvement of materials and design tools, the field strength in transformers increased. In recent years there was a significant number of outages in distribution transformers, which were related to partial discharges and wax formation. The purpose of this research is to understand how this wax is formed and how different insulation liquids behave in regard to the wax formation. Observations from the investigation of faulty transformers are compared to a lab experiment. A scaled model of the high voltage insulation of a distribution transformer was designed and build to investigate the influence of temperature and partial discharges on the generation of waxlike substances in the laboratory. Different insulation fluids, such as synthetic and natural esters and silicone fluids are investigated as well as a mineral oil for comparison. They are stressed with partial discharges for a duration of 200h. The partial discharges are monitored to allow a comparison between the PD energy and the amount of wax formed during the experiment. The tests are performed at different temperatures, as previous investigations have shown a significant influence of the temperature.
Keywords
- Liquid, Solid ageing products, Transformer, X-wax
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. IEEE Computer Society, 2019. 8796699 (Proceedings - 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 - Comparison of X-Wax Formation in Different Insulation Liquids
AU - Kuhnke, Moritz
AU - Homeier, Kristin
AU - Werle, Peter
N1 - The authors would like to thank Mr. Sven Gallas, B.Sc. for his help with the practical experiments.
PY - 2019/6
Y1 - 2019/6
N2 - The formation of solid wax-like ageing products in mineral oil under high voltage stress is known for almost a century. It was observed in oil-impregnated cables, bushings and capacitors. Its formation was generally attributed to high field strength and partial discharges. Since these types of equipment do not rely on oil flow for cooling the wax formation was seen as a sign of wear and not by itself as threat to the equipment.With the improvement of materials and design tools, the field strength in transformers increased. In recent years there was a significant number of outages in distribution transformers, which were related to partial discharges and wax formation. The purpose of this research is to understand how this wax is formed and how different insulation liquids behave in regard to the wax formation. Observations from the investigation of faulty transformers are compared to a lab experiment. A scaled model of the high voltage insulation of a distribution transformer was designed and build to investigate the influence of temperature and partial discharges on the generation of waxlike substances in the laboratory. Different insulation fluids, such as synthetic and natural esters and silicone fluids are investigated as well as a mineral oil for comparison. They are stressed with partial discharges for a duration of 200h. The partial discharges are monitored to allow a comparison between the PD energy and the amount of wax formed during the experiment. The tests are performed at different temperatures, as previous investigations have shown a significant influence of the temperature.
AB - The formation of solid wax-like ageing products in mineral oil under high voltage stress is known for almost a century. It was observed in oil-impregnated cables, bushings and capacitors. Its formation was generally attributed to high field strength and partial discharges. Since these types of equipment do not rely on oil flow for cooling the wax formation was seen as a sign of wear and not by itself as threat to the equipment.With the improvement of materials and design tools, the field strength in transformers increased. In recent years there was a significant number of outages in distribution transformers, which were related to partial discharges and wax formation. The purpose of this research is to understand how this wax is formed and how different insulation liquids behave in regard to the wax formation. Observations from the investigation of faulty transformers are compared to a lab experiment. A scaled model of the high voltage insulation of a distribution transformer was designed and build to investigate the influence of temperature and partial discharges on the generation of waxlike substances in the laboratory. Different insulation fluids, such as synthetic and natural esters and silicone fluids are investigated as well as a mineral oil for comparison. They are stressed with partial discharges for a duration of 200h. The partial discharges are monitored to allow a comparison between the PD energy and the amount of wax formed during the experiment. The tests are performed at different temperatures, as previous investigations have shown a significant influence of the temperature.
KW - Liquid
KW - Solid ageing products
KW - Transformer
KW - X-wax
UR - http://www.scopus.com/inward/record.url?scp=85071465534&partnerID=8YFLogxK
U2 - 10.1109/icdl.2019.8796699
DO - 10.1109/icdl.2019.8796699
M3 - Conference contribution
AN - SCOPUS:85071465534
SN - 978-1-7281-1719-5
T3 - Proceedings - IEEE International Conference on Dielectric Liquids
BT - 2019 IEEE 20th International Conference on Dielectric Liquids, ICDL 2019
PB - IEEE Computer Society
T2 - 20th IEEE International Conference on Dielectric Liquids, ICDL 2019
Y2 - 23 June 2019 through 27 June 2019
ER -