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Abstract
The stator main insulation is the key component of turbo-generator, which is related to the thermal aging of turbo-generator. It is vital to accurately judge the generator aging by calculating the temperature distribution under main insulation normal operation and fault operation. In this paper, taking a 150 MW air-cooled turbo-generator as an example, the temperature field of the main insulation was studied after the stator main insulation shelling. Based on the finite element method, the stator temperature field after the main insulation shelling was calculated. The main insulation position of maximum temperature drop and the temperature distribution of the stator main insulation along the circumference and the axial direction were analyzed. At the same time, with the shelling gap of main insulation increases, the temperature distribution between shelling gap δ = 0.5 mm and δ = 1.0 mm was compared. The results can provide a theory for fault monitoring and diagnostics of the large-scale turbine generator.
Highlights
Under the influence of electric, thermal, vibration and mechanical stresses, the stator and rotor main insulation of the generator may be caused serious faults such as aging, shelling and discharging.Many specialists make researches about generator insulation failure mechanism, discharging and fault monitoring after insulation aging [1–10]
A 150 MW air-cooled turbo-generator is taken as an example to study the stator main insulation temperature field of the air-cooled turbo-generator after the main insulation shelling in this paper, which can provide a theory for the diagnosis of the generator after the fault operation
With the increase of the shelling gap, the main insulation temperature drop of the shelling side becomes smaller, and the temperature drop of the un-shelling becomes larger, which can lead to bilateral shelling of main insulation considering the thermal aging
Summary
Under the influence of electric, thermal, vibration and mechanical stresses, the stator and rotor main insulation of the generator may be caused serious faults such as aging, shelling and discharging. Many specialists make researches about generator insulation failure mechanism, discharging and fault monitoring after insulation aging [1–10]. It can be defined that main insulation occurs delamination and shelling by evaluating the insulation conditions after thermal cycling test. C. Stone made a comprehensive research on electrical insulation for rotating machines, especially in design, evaluation, aging, testing and repair [13–17]. A 150 MW air-cooled turbo-generator is taken as an example to study the stator main insulation temperature field of the air-cooled turbo-generator after the main insulation shelling in this paper, which can provide a theory for the diagnosis of the generator after the fault operation
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