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The paper presents an approach to modeling of shorted turns in rotor field winding of synchronous generator using finite element method. It enables detailed analysis of magnetic field at several operating conditions under healthy and faulty states which are difficult or even impossible to carry out by available measurement methods in industrial environment. Modeling of field winding faults are performed...
This paper deals with detection of inter-coil short circuits in the synchronous machine armature winding, for the machines having the armature winding with coils, based on the analysis of the magnetic field present in the machine. Applying FEM (finite element method) to the generator model, magnetic field wave forms in the machine have been calculated for every point of interest, under correct and...
This paper reports on the study of winding asymmetries in small synchronous generators. These types of generator are commonly used in diesel generator or back-up systems and are usually no more than a few or few tens of kilowatts with two, four or six salient poles. The 3-phase winding is 120 deg pitched but often lap windings are not used, rather a hybrid of concentric winding and double layering...
Flux monitoring via air gap flux probes is a proven technology used for many years in synchronous machines to determine the presence of turn-to-turn shorts in a rotor winding. This information is critical in planning maintenance outages and in augmenting on-line vibration analysis. Traditionally, flux measurements have been done using flux probes installed on a stator wedge and a portable or permanently...
The work considers the issues connected with application of non-overlapping coils in the homopolar inductor machines. The calculation and analysis are performed for the magnetic field in the tooth zone of such a machine, and, based on the results, recommendations are given on the choice of optimal parameters of the tooth zone. The sample under study is a 32 kW experimental inductor generator.
Multi turn coils utilizing Global Vacuum Pressure Impregnation (GVPI) technology for solid dielectric insulation of high voltage armature windings in the range of 20 to 35 MVA rating turbine generator is well established practice and number of machines are successfully operating in power sectors. This paper presents design development and manufacture of higher capacity machine in 4 pole category with...
This paper presents a fault detection system based on multilayer feedforward artificial neural network (ANN) for detection of one or several broken parallel coils of a small generator. This fault type cannot visibly influence on machinepsilas normal performance and since the performance of a faulty machine with broken coils is similar to that of a healthy one with unbalance load, therefore detection...
The on-line fault diagnosis technique based on search coil method for detecting inter-turn short circuits in turbo-generator rotor winding is used. Based on completely different properties of induced electric potential signals in the air gap and noise characteristic of the generator operated in different conditions is analyzed, wavelet transform and Mallatpsilas local maximum de-noising algorithm...
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