Advances in Engineering Advances in Engineering features breaking research judged by Advances in Engineering advisory team to be of key importance in the Engineering field. Papers are selected from over 10,000 published each week from most peer reviewed journals.
Significance Statement
The concept demonstrated in the Applied Physics Letters publication has been used in additional studies. In particular,the focus was to develop a commercial dielectric liquid formulation which is both non-toxic and cost-effective. The application area of interest for these liquids are power transformers which demands additional stringent requirements on the liquid properties such as aging behaviors, viscosity, freezing point, flash point etc. We are able todemonstrate now that all requirements for a natural ester dielectric liquid formulation to be used in transformer application can be achieved with similar breakdown characteristics as demonstrated in our paper in Applied Physics Letters. These results will be presented at the IEEE International Conference on Dielectric Liquids 2014 in Bled, Slovenia.This opens the possibility to design environment-friendly power transformers at higher voltages and power ratings without a significant increase in the physical footprint of the transformer.
Appl. Phys. Lett. 102, 172905 (2013).
Mikael Unge, Santanu Singha, Nguyen Van Dung, Dag Linhjell, Stian Ingebrigtsen, Lars E. Lundgaard.
ABB Corporate Research, SE 72178 Västerås, Sweden and
Department of Electric Power Engineering, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway and
Department of Electric Power Engineering, SINTEF Energy Research, NO 7465 Trondheim, Norway.
Abstract
In this letter, we experimentally demonstrate that the lightning impulse breakdown characteristics of natural ester liquids can be significantly enhanced by dispersing molecular additives possessing lower values of both the ionization potential and 1st excitation energies as compared to the base liquid. One such additive contributed to an increase in the breakdown and acceleration voltage of the base liquid by 32% and 90%, respectively. Apart from the expected influence of the low ionization potential of the additives, results also indicate a positive effect of lower value of 1st excitation energy.
© 2013 AIP Publishing LLC
