Title :
A thermohydraulic modelling for the stator bars of large turbogenerators: development, validation by laboratory and on site tests
Author_Institution :
Direction des Etudes et Recherches, Electr. de France, Clamart, France
fDate :
3/1/1997 12:00:00 AM
Abstract :
This paper presents a thermohydraulic model of stator bars in large turbogenerators. From the losses dissipated in a bar and considering the heat transfer by conduction and convection, it calculates the hot spot temperatures in it and the slot thermocouple temperature, for a clean or polluted stator. This model has been validated by laboratory tests made on individual bars and also by on site measurements made on a 900 MW turbogenerator. It shows the difficulty for the detection of hot spots by a slot thermocouple, and its systematic detection by the water temperature measurement at the bar outlet end. The modelling may be applicable for water-cooled machines ranging from 600 MW up to 1500 MW
Keywords :
convection; cooling; heat conduction; losses; machine theory; stators; thermal analysis; thermocouples; turbogenerators; 600 to 1500 MW; bar outlet end; clean stator; conduction; convection; heat transfer; hot spot temperatures; hot spots detection; losses dissipation; on site measurements; polluted stator; slot thermocouple temperature; stator bars; thermohydraulic modelling; turbogenerators; water temperature measurement; water-cooled machines; Contact resistance; Copper; Electric resistance; Stator bars; Surface resistance; Temperature; Thermal conductivity; Thermal resistance; Turbogenerators; Water heating;
Journal_Title :
Energy Conversion, IEEE Transactions on
