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Transient thermal variation in stator winding of nuclear power turbo-generator with the inner sudden water brake

Transient thermal variation in stator winding of nuclear power turbo-generator with the inner sudden water brake

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For nuclear power turbo-generators, the transient thermal variation of its winding and its insulation is one of the important performance indices. For a long time, there have been some occasional accidents at nuclear power stations such as hydrogen and fuel rod leakage. These accidents affect the economy and the safety of people. In this study, a transient temperature variation mechanism of stator winding strands and insulation with a stator water brake has been researched. On account of the stator slot being an open structure, the resistance and reactance are different along the radial direction of the slot. It results in the heat source being different for different strands in the stator slot. The resistance enhancement coefficient of the stator strands is calculated based on the analysis of the eddy-current of magnetic field. A transient fluid-thermal coupled model of a 1000 MW nuclear power turbo-generator stator is established regarding the resistance enhancement coefficient. Calculation results of the insulation temperature are compared with the test data of the turbo-generator that is used at a nuclear power plant.

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