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G. Stojcic, T. Wolbank:
"Detecting High-Resistance Connection Asymmetries in Inverter Fed AC Drive Systems";
Vortrag: IEEE International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives SD, Valencia, Spain; 27.08.2013 - 30.08.2013; in: "Proceedings of 9th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives", (2013), ISBN: 978-1479900244; S. 1 - 6.

The wiring system between inverter and the
machine consists of different parts connected by metal-to-metal
joints. High load currents lead to an increase temperature of
the connections and higher material degradation. Basically,
these effects result in an increased resistance in one phase. If
such faults are not identified timely an unexpected outage of
the whole system can be a consequence. However, the degree of
reliability of the wiring system should not be less than that of
the machine or inverter. Detecting such small resistance
incensement provide the possibility to react timely on the
occurred fault. In this paper a method is presented to detect
open-circuit faults in the stator windings of an inverter fed
drive. The method gets along with the hardware already
present and doesn´t need additional sensors etc. By applying
voltage phasor steps to the machine terminals and measuring
the resulting current the phase resistance can be estimated. By
combination of the current direction with the phase resistance
value resistance phasors can introduced. With these phasors a
high sensitive fault indicator is generated able to detect
connection fault severity and position. Measurements on a
laboratory test stand for different fault configurations prove
the applicability and accuracy of the proposed method.

http://publik.tuwien.ac.at/files/PubDat_223893.pdf