Browsing NTNU Open by Author "Jonsson, Erik"
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Ageing of Technical Air and Technical Air with 7.5% C5-Fluoroketone by Free-Burning Arcs
Subhana, Arik; Støa-Aanensen, Nina Sasaki; Gammelsæter, Marte; Jonsson, Erik; Mauseth, Frank (Journal article; Peer reviewed, 2023)This paper reports on the effect of ageing by free-burning arcs in 7.5% C5-fluoroketone (C5-FK) with 92.5% technical air in comparison to that in technical air (80% N2, 20% O2) at 1.3bar absolute pressure. The gases are ... -
Arc Voltage Characteristics in Ultrahigh-Pressure Nitrogen Including Supercritical Region
Abid, Fahim; Niayesh, Kaveh; Jonsson, Erik; Støa-Aanensen, Nina Sasaki; Runde, Magne (Journal article; Peer reviewed, 2017)A supercritical (SC) fluid is formed when both pressure and temperature of a fluid exceed the critical point, where distinct gas and liquid phases no longer exist. SC fluids demonstrate combined properties of gas and liquid, ... -
Effect of Filling Pressure on Post-Arc Gap Recovery of N2
Abid, Fahim; Niayesh, Kaveh; Viken, Egil; Støa-Aanensen, Nina Sasaki; Jonsson, Erik; Meyer, Hans Kristian Hygen (Peer reviewed; Journal article, 2020)Experimental investigation of the effect of filling pressure on the post-arc dielectric recovery characteristics of nitrogen is reported in this paper. A half-cycle arc current duration of 540 μs followed by a 10 kV pulse ... -
Experimental investigation on ablation-assisted current interruption - Experimental setup and preliminary results
Taxt, Henning; Niayesh, Kaveh; Jonsson, Erik; Runde, Magne (Chapter, 2016)This paper presents a flexible setup to investigate ablation-assisted interruption of load currents. The electrical test circuit is grid connected with a transformer secondary voltage from 6.9 kV to 24 kV. The applied ... -
Load Current Interruption in Air for Medium Voltage Ratings
Jonsson, Erik (Doktoravhandlinger ved NTNU, 1503-8181; 2014:83, Doctoral thesis, 2014)Load break switches (LBSs) are common inside metal clad switchgear assemblies where space is a limiting factor. SF6 is usually used in this application due to its superior electrical characteristics, but is unfortunately ...