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P.W. Nussbaumer, T. Wolbank, M. Vogelsberger:
"Separation of Disturbing Influences on Induction Machine´s High-Frequency Behavior to Ensure Machine´s High-Frequency Behavior to Ensure";
Vortrag: IEEE Applied Power Electronics Conference, Long Beach, CA, USA; 17.03.2013 - 21.03.2013; in: "Proceeding of IEEE Aoolied Power Electronics Conference", (2013), S. 1 - 6.

The range of industrial applications requiring
adjustable speed drives (ASD) is continuously increasing.
Although generally highly reliable, a breakdown of an electrical
machine has to be prevented under any circumstance for certain
applications like safety-critical devices or industrial systems
with many drives installed. To increase efficiency and return-oninvestment
the drives are operated at or near their rated values.
High dynamics, overload and the fast switching of the inverter
cause additional stress for the different drive components. One
of the major causes for drive breakdown is insulation
deterioration. Before an actual breakdown of the insulation
system occurs, the machine´s high-frequency behavior is altered.
Therefore monitoring of the drive´s hf-behavior can be
employed to evaluate the insulation condition. However, other
drive components like cabling, grounding or the inverter may
change the drive´s hf-behavior as well. The possibility to
separate the different influences of the machine´s hf-behavior is
thus essential and will be shown by experimental results.

http://publik.tuwien.ac.at/files/PubDat_223898.pdf