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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.
진동 해석을 통한 300 MW급 저압터빈 블레이드의 손상 원인 규명
배용채(Bae, Yong-Chae),이현(Lee, Hyun),김희수(Kim, Hee-Soo) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.9
The failure of blades frequently happened in the 300 MW LP(low pressure) turbine until now and they are maintaining the blades periodically during outage. So the blade-disk system is analysed by FEM in order to identify the main cause of failure of blade row. It is found that the stress of root's hole is highest in comparison with other parts from the result of the steady stress analysis. Also, the two dangerous frequencies which is related to the resonance condition are found in the interference diagram. One is 1,316 Hz. The other is 2,981 Hz which is related to the 1 nozzle passing frequency. The dynamic stress analysis is performed to identify more accurate root cause for failure of blade row It is confirmed that the dynamic stress of the former is higher than one of the latter From these results, it is concluded that the former has deeply something to do with the failure of blades more than the tatter. Based on versatile investigation and deliberation, the change of blade's grouping is determined to avoid the resonance condition with the operating speed. After the blade grouping is changed, the former frequency vanish completely but the latter is still in existence in the interference diagram. Fortunately, It is confirmed that the dynamic stress of the new blade grouping is lower than one of the old blade grouping. 2 years has passed since modification and the LP turbine is operated well without failure so far.