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A novel on-line technique for monitoring the insulation condition of AC machine stator windings is proposed in this paper. The concept is to measure the differential leakage currents of each phase winding from the terminal box in a non-invasive manner to assess the insulation condition during motor operation. The conventional differential CTs used for phase fault protection can be replaced with high...
Condition monitoring of electric machines is of increasing importance. The continuous assessment of the machine performance allows to schedule appropriately maintenance operations, thus increasing machine operating life and reducing repair cost. The input current spectrum is a wide spread procedure for non-invasive diagnosis of induction machines. Information on rotor variables are available only...
This paper presents a novel high frequency driven induction motor. Its rotor conductor structure, which has only single-phase winding, is different from the squirrel-cage rotor. Its single-phase short-circuit rotor windings exhibit different inductance distribution at different rotor position corresponding to stator winding. This phenomenon is similar with the reluctance machine. In order to start...
The development of cost-effective maintenance strategies requires diagnostic tools which detect any defects as early as possible to enable the determination and selective planning of the requisite repair measures. The sensitive partial discharge (PD) measurement method enables the detection of individual weak points developing in generator high voltage stator insulation in their initial stages. However,...
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