Part of #STATOR COOLING ANALYSIS OF LARGE TURBO GENERATORS# :
Publishing year : 2013
Conference : Fifth Fluid Dynamics Conference (Fluid)
Number of pages : 11
Abstract: The present paper deals with the investigation of flow parameters and thermal characteristics of the stator of large air-cooled turbo generators. As the first step to modulate the complex geometry of the stator cooling system, the flow part is analyzed by specifying the uniform nodes along the stator airgap. Calculate the fl ow resistances which are due to friction and minor losses, and then determine the pressure drop and flowrates. For thethermal analysis, flowrates are employed, and the thermal network method is applied byconsidering the nodes along the stator windings and core in the radial direction. Thermal resistancesand electro-mechanical losses are calculated and consequently by employing iterativesolution, the temperature distribution on windings and stator core is obtained. The results show that the maximum temperature is at windings where there are losses due to electric current. Moreover, the stator core temperature decreases in radial direction. Also, based on the predicted temperature rise of stator windings, the insulation class of stator windings has been specified. This necessitates the need for further optimizing the insulation materials. Results are in good agreement with available experimental data.