The author describes a DC traction motor test regime which hasproven highly successful for Queensland Rail (QR), Australia, over thepast five years, being initially driven from the commercial view pointof preventing costly operational failures of traction machines. Thebenefits of this policy are now starting to be realised, however, it hasbeen a long process. Such developments are highly dependent on adetailed knowledge of the motor insulation and coil structure. Thisprocess of developing nonintrusive test indicators of traction machinesis now also being applied to the stator windings of the newerthree-phase asynchronous traction machines now starting service in QR.This basis for cost effective maintenance and minimisation ofoperational failures within QR continues. There is ongoing research intothe development of these indicators. Training of QR staff andcontractors, in testing for these indicators, observing unusual machinebehaviour/test results and deviation from normal operation, continues
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