| 1. |
- Murdany, Deni, 1983, et al.
(författare)
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Electrical treeing in polyethylene-alumina-filled nanocomposites for HVDC applications
- 2015
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Ingår i: Proceedings - 5th International Conference on Electrical Engineering and Informatics. - 9781467373197 ; , s. 213-216
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Konferensbidrag (refereegranskat)abstract
- Electrical tree formations under DC pre-stress followed by an application of voltage pulses of opposite polarities were observed in low density polyethylene and its nanocomposite filled with 1.0 wt% and 3.0 wt% alumina nanoparticles. A special wire-plane electrode geometry were manufactured for the test. The obtained experimental results indicate that the addition of the nanoparticles has a positive impact on the resistance to electrical treeing. In addition to the reported above results, a thermal ageing and electro-thermal experiment is presently being conducted and the results comparing the treeing behavior after it will also be presented.
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| 2. |
- Pasquini, Luca, et al.
(författare)
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Magnesium- and intermetallic alloys-based hydrides for energy storage : modelling, synthesis and properties
- 2022
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Ingår i: Progress in Energy. - : Institute of Physics Publishing (IOPP). - 2516-1083. ; 4:3
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Forskningsöversikt (refereegranskat)abstract
- Hydrides based on magnesium and intermetallic compounds provide a viable solution to the challenge of energy storage from renewable sources, thanks to their ability to absorb and desorb hydrogen in a reversible way with a proper tuning of pressure and temperature conditions. Therefore, they are expected to play an important role in the clean energy transition and in the deployment of hydrogen as an efficient energy vector. This review, by experts of Task 40 'Energy Storage and Conversion based on Hydrogen' of the Hydrogen Technology Collaboration Programme of the International Energy Agency, reports on the latest activities of the working group 'Magnesium- and Intermetallic alloys-based Hydrides for Energy Storage'. The following topics are covered by the review: multiscale modelling of hydrides and hydrogen sorption mechanisms; synthesis and processing techniques; catalysts for hydrogen sorption in Mg; Mg-based nanostructures and new compounds; hydrides based on intermetallic TiFe alloys, high entropy alloys, Laves phases, and Pd-containing alloys. Finally, an outlook is presented on current worldwide investments and future research directions for hydrogen-based energy storage.
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| 3. |
- Azhari, Rian Hafiizh, 1984, et al.
(författare)
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Dielectric properties of graphene nanoplatelets filled LDPE
- 2016
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Ingår i: 5th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2016, Chengdu, China, 19-22 September 2016. - 9781509004966 ; 16, s. A-4-1-
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Konferensbidrag (refereegranskat)abstract
- This work presents studies on electricalproperties of nanocomposites of low density polyethylene(LDPE) filled with graphene nanoplatelets (GnP) ofdifferent content. As compared to pure LDPE, significantreductions of the conductivity are found for the compositesat relatively low electric fields (below 20 kV/mm). Acrossover effect is however seen at higher fields (above 20kV/mm), where a strong field dependent non-linearbehavior dominates, yielding higher conduction currentsthat increase with increasing filler content. Results ofinvestigations of dielectric response confirm the differencesfound in polarization currents during the measurements ofdc conductivity.
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| 4. |
- Chen, Xiangrong, 1982, et al.
(författare)
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AC and DC Pre-stressed Electrical Trees in LDPE and its Aluminum Oxide Nanocomposites
- 2016
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Ingår i: IEEE Transactions on Dielectrics and Electrical Insulation. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-4135 .- 1070-9878. ; 23:3, s. 1506-1514
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Tidskriftsartikel (refereegranskat)abstract
- Resistance of pure low density polyethylene (LDPE) and its aluminum oxide nanocomposites (up to 3.0 wt%) to degradation by electrical treeing under AC stress and DC pre-stress is analyzed. The experiments were carried out on wire-plane electrode specimens before and after exposure to thermal and DC electro-thermal ageing at 80 °C. The obtained results showed enhanced resistance of the nanocomposites to electrical tree inception under AC stress and the tree inception voltage (TIV) increased with nanoparticles content. It has been shown that there was an improved partial discharge (PD) resistance in the nanocomposites compared to the unfilled LDPE. The results also showed that the AC TIV in the nanocomposites consistently increased with the ageing and especially the DC electro-thermally aged specimens had about 30% higher the AC TIV as compared to the unaged material. This effect is attributed to significantly reduced mobility of charge carriers in the nanocomposites. The DC pre-stressed electrical trees generated in the investigated materials were of filamentary-branch structure and the branch channels content increases with the addition of nanoparticles. The mean tree number of the DC pre-stressed electrical trees decreased in the LDPE and its nanocomposites while the mean maximum tree length increased with the ageing treatments. It is postulated that material recrystallization and a very high electric field level on the wire electrode during the DC pre-stressed electrical tree test are the main reasons for the observed effects.
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