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배용채(Y. C. Bae),김희수(H. S. Kim),이두영(D. Y. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Water leak for the water-cooled generator stator windings affects seriously the availability and the reliability of power plants. Generally, water absorption test is conducted in the power plant during outage in order to confirm if leak part is in the bars or not. In this paper, it is described that the capacitance of winding bars is measured by using the developed water absorption instrument system and the water absorption of winding bars is evaluated by using the stochastic methods. The good results by proposed diagnosis technique can be got. It is expected that the reliability of diagnosis for water absorption is increased if the proposed methods are applied to evaluate the water absorption of stator winding bars.
500㎿급 화력 발전기 냉각수 온도에 따른 고정자 권선 절연재의 흡습 특성에 관한 실험적 연구
裵容彩(Yong-Chae Bae),金希洙(Hee-Soo Kim),李斗寧(Doo-Young Lee),李旭倫(Wook-Ryun Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.8
The mechanical integrity of generator stator windings is one of the critical point because the electric power is generated and conducted to power system through these windings. De-mineralized water is used to cool stator bars during the normal operation of generator in large power plants because the water cooled method has highest cooling efficient. Water absorption of bar insulation is progressed by several causes such as generation of water leak path by corrosion, delamination of insulation by vibration, and inadequate water treatment, etc.. Reliable water absorption diagnostics of generator stator bar is important to ensure the availability of power plant and to reduce maintenance cost by generator accident. It is described that the water absorption characteristics for generator stator bar insulation used in 500㎿ capacity standard fossil power plant by cooling water temperature. It is verified that the management of stator cooling water temperature is one of the important factors to decrease water absorption rate of generator stator bars.
배용채(Yong-Chae Bae),김희수(Hee-Soo Kim),이두영(Doo-Young Lee),이현(Hyun Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An unwanted outage of power unit can be occurred by significant insulation damage due to water absorption for generator stator bars. Reliable absorption test and diagnostics of water cooled generator stator bars are important to ensure the availability of power plant and to reduce maintenance cost by generator accident. It is described that the test method and the several stochastic evaluation methods for generator stator bar absorption. It is evaluated that the suggested methods can be used for reliable water absorption diagnosis of bar insulation by analysing the actual test result for generator stator bars in power plant.