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P.W. Nussbaumer, M. Vogelsberger, T. Wolbank:
"Exploitation of Induction Machine´s High-Frequency Behavior for Online Insulation Monitoring";
Vortrag: IEEE International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives SD, Valencia, Spain; 27.08.2013 - 30.08.2013; in: "Proceeding of 9th IEEE International Symposium on Diagnostics for Electrical Machines, Power Electronics&drives", (2013), ISBN: 978-1479900244; S. 1 - 7.

The trend to increased energy efficiency and
profitable capital expenditure leads to the operation of drive
systems at or near their rated values and to increased running
time. Thus, down time due to machine breakdown (e.g. in a
traction drive) leads to high economic losses for the operator.
Furthermore, the breakdown of safety-critical devices may lead
to dangerous situations. Due to the above stated reasons the
demand for operation reliability is constantly increasing.
The fast switching of the voltage source inverter (VSI) in
adjustable speed drives (ASD) leads to increased stress for the
winding insulation. Thus, it gets even more important to
monitor the condition of the insulation in inverter-fed drives.
Degradation of the insulation results in an alteration of the
machine´s high-frequency behavior. The proposed method is
capable of detecting such changes by evaluation of the transient
current reaction on inverter switching.

http://publik.tuwien.ac.at/files/PubDat_223889.pdf