Turbine generator stator slot thermal conductivity

Thermal power dissipation from vacuum pressure impregnated stator coils to the stator core in turbine generators is a topic of technical importance. In order to increase turbine generator MVA output by increasing current through the coil wire strands, there must be improved thermal conductivity in the stator slot to improve thermal power dissipation capability. A benchmark study of vacuum pressure impregnation (VPI) and global vacuum pressure impregnation (GVPI) stator coil groundwall insulation has been investigated in a previous paper (1997). This paper builds on the model showing a relationship between the stator coil groundwall insulation composition and thermal conductivity. This paper looks at improving the stator slot thermal conductivity by increasing the thermal conductivity of the stator coil groundwall insulation and the region between the stator coil and the core. The models generated provide a design tool which can estimate the thermal conductivity in the stator slot, from the coil wire strands to the core.