Abstract
Leakage magnetic field from the rotor end windings affects obviously the electromagnetic losses and temperature of end components in the turbine generator end zone with magnetic screen. As the capacity of turbine generator increases, this effect of rotor end windings has become more prominent. To investigate influence of the extension length of rotor end windings on the electromagnetic and thermal fields in the turbine generator end zone with magnetic screen, three-dimensional transient electromagnetic field model of 1250 MW turbine generator end zone is given. Leakage magnetic field and losses of end components are compared and studied in the end zone under the different extension lengths of rotor end windings. Based on the calculation results of electromagnetic losses (heat sources) and flow network (boundary conditions), three-dimensional fluid-thermal coupling field is calculated in the turbine generator end zone with magnetic screen. Distribution of complex fluid velocity in the end zone is obtained. Influence of the different extension lengths of rotor end windings on the stator-end copper coil, screen plate, finger plate, press plate, magnetic screen, and stator end core is researched in the turbine generator end zone. The accuracy of calculation results is validated by experimental values.
Highlights
Size of the end windings has a great effect on the electromagnetic losses and temperature rise of end components in the turbine generator end zone with magnetic screen
Influence of the different extension lengths of rotor end windings on the electromagnetic losses and temperature distribution of the end components is studied in the large turbine generator end zone with magnetic screen, which could provide the important reference for the optimization design of the turbine generator end zone
When the extension length of rotor end windings increases from H=45 mm to H=205 mm, the change of flux density at position F is large and it is 0.16T
Summary
Size of the end windings has a great effect on the electromagnetic losses and temperature rise of end components in the turbine generator end zone with magnetic screen. Reasonable design of the extension length of rotor end windings could reduce effectively the losses and temperatures of the end metal components, which improves obviously the heat resistance of the large turbine generator. Some other experts studied the multi-physics field of turbine generator [11]–[14], but very few focused on the influence of the extension length of rotor end windings on the electromagnetic losses, fluid flow, and thermal field in the large turbine generator end zone with magnetic screen. Influence of the different extension lengths of rotor end windings on the electromagnetic losses and temperature distribution of the end components is studied in the large turbine generator end zone with magnetic screen, which could provide the important reference for the optimization design of the turbine generator end zone
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