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Citations since 2017
5 Research Items
A concept for the application of a magnetocaloric device in energy-efficient air conditioners is introduced. In order to evaluate this concept, a test stand has been developed equipped with a magnetic field source providing about a 1.5-T flux density change into which different regenerator geometries can be implemented and evaluated. A processing r...
This paper presents a simplified method to compute the frequency dependent coupling resistances inside high current instrument transformers (HCTs). The solution of the one-dimensional Helmholtz equation is used to estimate the losses inside the winding layers dependent on the frequency of the exciting current. The resistive couplings inside the HCT...
In this paper an analytical method is presented to compute the frequency dependent magnetization inductance and iron losses resistance of the conventional equivalent circuit of current instrument transformers. This model takes into account the effect of eddy currents which are more pronounced at higher frequencies. Furthermore, this model considers...
The feasibility of accurate monitoring a high voltage is investigated, which based on measuring a current through a capacitor, which is already installed in the grid. A current clamp based measuring system with high-resolution digitizer was developed. In order to adapt the system for different capacitors, the current clamp sensor is designed for a....
In this paper a measuring system is presented to determine the frequency dependent transmission behaviour of high current instrument transformers (HCTs). Due to its high requirements, several components have been specially designed. These special requirements and the applied technical solutions are presented in this paper. Power amplifiers generate...