Michael Hausmann (1), Norbert Grass (2)
(1) GSO University of Applied Sciences Nuremberg, Kesslerplatz 12, 90489 Nuremberg, Michael.Hausmann@ohm-hochschule.de
(2) GSO University of Applied Sciences Nuremberg, Kesslerplatz 12, 90489 Nuremberg, Norbert.Grass@ohm-hochschule.de
Abstract
In this paper, theoretical and experimental studies on the influence of higher frequencies of the load current on the power dissipation of NH gG fuse-links will be presented. By means of a power electronic converter, currents with variable frequencies and amplitude were fed thru NH gG fuse-links and model fuse-links with up to four parallel fusible conductors. The power dissipation and the pre-arcing times of the fuse-links have been compared at 50 Hz, 400 Hz and 1.000 Hz. Based on the power dissipation at different current frequencies, reduction factors for the fuse-link rated currents have been calculated, to obtain time-current characteristics similar to 50 Hz rated frequency currents. The pre-arcing times are shown in a time-current characteristic diagram of a standard fuse-link. The results are particularly gaining relevance due to increasing contents of harmonic currents in public grids and industrial plants.
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