Electrical converter-cable-machine systems, such as those in renewable source interfaces and transport drives, are operated with increasingly fast and high-performance converters. Their effects on the stator insulation and, in particular, on the turn insulation, need be understood in detail. A dynamic/FEM model is used to simulate the maximum voltages stressing the turn-to-turn and phase-to-ground insulation. The results show the role of rise time in the generation of overshoots and uneven voltage distribution. For machine to be fed with wide-bandgap converters, the limitations of PD testing using conventional surge generators are highlighted. Besides, the limits of the rise time definition and its role in the IEC60034-18-41/42 standards are discussed with reference to non-ideal waveforms acquired from a SiC bipolar converter.
Insights into the definition of converter surge rise time and its influence on turn/turn electrical stress / Rumi, A.; Marinelli, J. G.; Pastura, M.; Barater, D.; Cavallini, A.. - (2021), pp. 272-276. (Intervento presentato al convegno 2021 IEEE Workshop on Electrical Machines Design, Control and Diagnosis, WEMDCD 2021 tenutosi a ita nel 2021) [10.1109/WEMDCD51469.2021.9425648].
Insights into the definition of converter surge rise time and its influence on turn/turn electrical stress
Pastura M.;Barater D.;
2021
Abstract
Electrical converter-cable-machine systems, such as those in renewable source interfaces and transport drives, are operated with increasingly fast and high-performance converters. Their effects on the stator insulation and, in particular, on the turn insulation, need be understood in detail. A dynamic/FEM model is used to simulate the maximum voltages stressing the turn-to-turn and phase-to-ground insulation. The results show the role of rise time in the generation of overshoots and uneven voltage distribution. For machine to be fed with wide-bandgap converters, the limitations of PD testing using conventional surge generators are highlighted. Besides, the limits of the rise time definition and its role in the IEC60034-18-41/42 standards are discussed with reference to non-ideal waveforms acquired from a SiC bipolar converter.
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