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배용채(Yongchae Bae),김희수(Heesoo Kim),이욱륜(Wookryun Lee),이두영(Dooyoung Lee),최홍일(Hongil Choi),연세흠(Seheum Yeon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
It is reported that the life of generator stator windings is expected about 30 years and a leak and water absorption phenomena can be progressed by fatigue, vibration, and corrosion. The water-cooled generator stator windings which were operated over 15 years are over 20 units and the mechanical problems such as leak and water absorption were found in the generator stator windings. In this paper, the systematic mechanical integrity evaluation methods which are applied to the water-cooled generator stator windings within the country are introduced.
수냉각 발전기 고정자 권선의 누수 시험을 위한 권선 내부 건조 판정 기준 설정에 관한 연구
김희수(Heesoo Kim),배용채(Yongchae Bae),이욱륜(Wookryun Lee),이두영(Dooyoung Lee),조성원(Sungwon Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The complete dryness of stator inside is a necessary and sufficient condition for leak test. Microcracks by high cycle fatigue due to operation are generated in stator windings and they are interrupted by water molecules during leak test. For this reason, during leak test, the wrong value is indicated as follows: There are no leaks in stator windings. Generator manufacturers presents unique dryness judgement criteria for leak test but actually any criteria never indicate accurate dryness point for leak test. The reason is that stator winding has a complexity of structure and absence of an effective dryness equipment in power plant. In this paper, dryness judgement criterion to judge if stator winding inside is dried completely is proposed and is testified experimentally.
최동권(Dongkwon Choi),한가람(Karam Han),김정면(JeongMyeon Kim),최병선(ByeongSeon Choi),송승헌(Seungheon Song),우주희(Joohee Woo),이욱륜(Wookryun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
As power generation methods based on renewable energy are distributed, the development of flexible operation technologies for existing thermal power generation is emerging. During flexible operation, life time reduction due to combustion instability and thermal fatigue is predicted and sufficient research is needed. In this study, the combustion according to the shape information of the boiler nozzle tip is analyzed, and the combustion point is analyzed by the thickness of the nozzle tip into two stage.