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G. Stojcic, L. Stankovic, G. Joksimovic, M. Vasak, N. Peric, T. Wolbank:
"Increasing Sensitivity of Stator Winding Short Circuit Fault Indicator in Inverter Fed Induction Machines";
Poster: International Conference on Power Electronics and Motion Control, EPE-PEMC, Novi Sad, Serbien; 04.09.2012 - 06.09.2012; in: "Proceedings of Power Electronics and Motion Control Conference, EPE-PEMC 2012 ECCE Europe, Novi Sad, Serbia", (2012), ISBN: 978-1-4673-1972-0; S. 1 - 6.

The inverter fed induction machine is becoming one of the most important drive application due to
speed variability, dynamics, and robustness. These advantages are possible by the development of high-power
transistors. On the other side these fast switching components lead to steep voltage rises and high stress on the
winding insulation of the machine. Faults in the winding system of a machine can cause a dramatic damage due to
their fast developing behaviour. An early detection of winding faults can reduce the consequences. In this paper a
method is investigated to detect stator winding faults in their early stage. The method is based on voltage pulse
excitation done by inverter switching. Current response measurements and subsequent signal processing lead to a
fault indicator with high precision and low dependence on the machine point of operation. Measurements on a
specially designed machine are carried out to determine the sensitivity of the fault indicator to early stage faults.

http://publik.tuwien.ac.at/files/PubDat_210718.pdf