CONTROL AND DIAGNOSIS OF ENCAPSULATION OF HOLLOW CONDUCTORS OF TURBOGENERATOR STATOR WINDING RODS OF TVB-1000-2U3 TYPE
Keywords:
turbogenerator, stator winding, mathematical model, encapsulation of the hollow conductors, temperature fields.Abstract
The method, mathematical models and algorithms for calculating the three-dimensional temperature field of the stator windings of the turbogenerator type TVV-1000-2U3 in stationary and transient modes of operation are given. The program for realization on the computer of finding of distribution of a three-dimensional temperature field in cores of stator windings of the specified turbogenerator in stationary and transient operating modes is developed. For comparison with the experimental data, calculations of nonstationary and stationary heating of the stator winding rods of the turbogenerator were performed. Comparison of calculated and experimental data showed that they differ by less than 5%. This indicates the reliability of the developed methods, mathematical models and algorithms. Calculations of three-dimensional temperature fields of the stator winding during start-up when the load of the turbogenerator changes from zero to nominal in the presence of complete and partial blockages of hollow conductors in the rods of this winding are performed. The calculated temperature - time dependences of the heating of the copper hollow conductor and the resistance thermometer (located under the wedge) in the groove of the upper rod of the stator winding are processed depending on the presence of defects when starting the turbogenerator. Diagnostic features are determined, with the help of which it is possible to reliably and effectively diagnose the appearance and development of a defect in the rods of the stator winding.
References
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