| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lehtonen, Matti
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Investigation of soil resistivity impacts on the electrodes of grounding system subjected to lightning strikescitations
- 2023A Novel Polyester Varnish Nanocomposites for Electrical Machines with Improved Thermal and Dielectric Properties Using Functionalized TiO2 Nanoparticlescitations
- 2023Condition Assessment of Natural Ester–Mineral Oil Mixture Due to Transformer Retrofilling via Sensing Dielectric Propertiescitations
- 2020PVC nanocomposites for cable insulation with enhanced dielectric properties, partial discharge resistance and mechanical performancecitations
- 2020PVC nanocomposites for cable insulation with enhanced dielectric properties, partial discharge resistance and mechanical performancecitations
- 2020Recent advances in polymer nanocomposites based on polyethylene and polyvinylchloride for power cablescitations
- 2020Recent advances in polymer nanocomposites based on polyethylene and polyvinylchloride for power cablescitations
- 2019Development of industrial scale PVC nanocomposites with comprehensive enhancement in dielectric propertiescitations
- 2018Multiple enhancement of PVC cable insulation using functionalized SiO2 nanoparticles based nanocompositescitations
- 2018Experimental measurements of partial discharge activity within LDPE/TiO2 nanocompositescitations
- 2018Impact of Nanoparticles Functionalization on Partial Discharge Activity within PVC/SiO2 Nanocompositescitations
- 2017Enhancement of dielectric and mechanical properties of Polyvinyl Chloride nanocomposites using functionalized TiO2 nanoparticlescitations
Places of action
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article
Condition Assessment of Natural Ester–Mineral Oil Mixture Due to Transformer Retrofilling via Sensing Dielectric Properties
Abstract
<p>Mineral oil (MO) is the most popular insulating liquid that is used as an insulating and cooling medium in electrical power transformers. Indeed, for green energy and environmental protection requirements, many researchers introduced other oil types to study the various characteristics of alternative insulating oils using advanced diagnostic tools. In this regard, natural ester oil (NEO) can be considered an attractive substitute for MO. Although NEO has a high viscosity and high dielectric loss, it presents fire safety and environmental advantages over mineral oil. Therefore, the retrofilling of aged MO with fresh NEO is highly recommended for power transformers from an environmental viewpoint. In this study, two accelerated aging processes were applied to MO for 6 and 12 days to simulate MO in service for 6 and 12 years. Moreover, these aged oils were mixed with 80% and 90% fresh NEO. The dielectric strength, relative permittivity, and dissipation factor were sensed using a LCR meter and oil tester devices for all prepared samples to support the condition assessment performance of the oil mixtures. In addition, the electric field distribution was analyzed for a power transformer using the oil mixtures. Furthermore, the dynamic viscosity was measured for all insulating oil samples at different temperatures. From the obtained results, the sample obtained by mixing 90% natural ester oil with 10% mineral oil aged for 6 days is considered superior and achieves an improvement in dielectric strength and relative permittivity by approximately 43% and 48%, respectively, compared to fresh mineral oil. However, the dissipation factor was increased by approximately 20% but was at an acceptable limit. On the other hand, for the same oil sample, due to the higher molecular weight of the NEO, the viscosities of all mixtures were at a higher level than the mineral oil.</p>