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증기터빈 저압 L-1단 블레이드-디스크 연성 진동 특성 분석
이두영(Lee, Doo-Young),배용채(Bae, Yong-Chae),김희수(Kim, Hee-Soo),이욱륜(Lee, Yook-Ryun),김두영(Kim, Doo-Young) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.1
This paper studies causes of the L-1 blade damage of a low pressure turbine, which was found during the scheduled maintenance, in 500 MW fossil power plants. Many failures of turbine blades are caused by the coupling of aerodynamic forcing with bladed-disk vibration characteristics. In this study the coupled vibration characteristics of the L-1 turbine bladed-disk in a fossil power plant is shown for the purpose of identifying the root cause of the damage and confirming equipment integrity. First, analytic and experimental modal analysis for the bladed-disk at zero rpm as well as a single blade were performed and analyzed in order to verify the finite element model, and then steady stresses, natural frequencies and corresponding mode shapes, dynamic stresses were calculated for the bladed-disk under operation. Centrifugal force and steady steam force were considered in calculation of steady and dynamic stress. The proximity of modes to sources of excitation was assessed by means of an interference diagram to examine resonances. In addition, fatigue analysis was done for the dangerous modes of operation by a local strain approach. It is expected that these dynamic characteristics will be used effectively to identify the root causes of blade failures and to perform prompt maintenance.
36-펄스 전압원 컨버터로 구성된 Back-to-Back HVDC 시스템의 실험적 분석
박용희(Yong-Hee Park),조윤호(Yun-Ho Cho),이두영(Doo-Young Lee),이동근(Dong-Geun Lee),한병문(Byung-Moon Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
본 논문은 펄스 삽입 보조 회로를 갖고 있는 12-펄스 브리지 4대를 사용한 36-펄스 back-to-back 전압원 컨버터를 제안한다. 제안된 back-to-back 전압원 컨버터는 교류 연계점에서 유효전력과 무효전력의 독립적인 제어가 가능하다. 펄스 수를 증가하는 원리는 이론적 접근을 사용하여 분석되었다. 제안된 시스템의 동작 타당성은 PSCAD/EMTDC 소프트웨어의 시뮬레이션을 통해 검증되었다. 하드웨어 구현 타당성을 검증하기 위해 축소모형을 제작하고 실험에 의해 분석하였다. 제안된 back-to-back 전압원 컨버터는 HVDC와 FACTS 장치로 널리 사용될 수 있다.
크로스 커패시턴스를 이용한 발전기 고정자 권선 절연물 흡습 측정 센서
배용채(Yong-Chae Bae),김희수(Hee-Soo Kim),이두영(Doo-Young Lee),이욱륜(Wook-Ryun Lee),이래덕(Rae-Deok Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.10
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. To cool down the heat emitted from generator winding during its operation, a majority of generators use de-mineralized water characterized by high cooling efficiency. Contrary to such the excellent cooling efficiency, however, the damaged bar insulations attributed to the absorption of cooling water in the generator stator winding lead to highly time- and cost consuming efforts as well as to service deterioration due to unexpected forced outage of generator. It is described that the new design of water absorption sensor using cross capacitance for generator in power plant in order to increase the reliability of water absorption diagnostics for generator stator bar insulation.
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.
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),이욱륜(Wook Ryun Lee),이두영(Doo Young Lee),김봉수(Bong Soo Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.6
디젤엔진은 기동 정지 시간이 빠르고 내구성과 신뢰성이 높아 발전소의 비상 발전기뿐 아니라 제한된 도서지역의 발전용으로 유용하게 사용되고 있다. 그러나 디젤엔진에 고진동이 발생될 경우 엔진 구조물 자체의 손상뿐 아니라 운전 신뢰성을 저해하는 요소가 될 수 있다. 본 논문은 고 진동으로 인하여 수년간 출력을 감발하여 운전되었던 10㎿ 급 발전용 디젤엔진의 고 진동 원인을 분석하기 위하여 수행한 시험 및 해석과 대책 수립에 대하여 기술하였다. 진동의 원인으로는 발전기 축의 비틀림 가진으로 인한 엔진 구조물의 공진으로 분석되었으며 수립된 대책을 실제 발전소에 적용하여 양호한 결과를 얻을 수 있었다. Diesel engines are widely used as a power supply for an isolated island as well as an emergency power supply for a large-cap power plant because of its rapid response to operation, high reliability and durability. However, diesel engines are also vulnerable to having damages or degradation of reliability when a high level of vibration is generated into it. This paper shows experiments and analysis to determine causes of high vibration phenomena in a large-scale diesel engine which has been experienced various power decreasing for several years due to the high level of vibration. The main cause of the high vibration is identified to be a resonance created by torsional vibration of its crank axis and an appropriate countermeasures we have made worked well when it is applied to the field tests.
배용채(Yong Chae Bae),김희수(Hee Soo Kim),이욱륜(Wook Ryun Lee),이두영(Doo Young Lee),김봉수(Bong Soo Kim) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.10
디젤엔진은 기동 정지 시간이 빠르고 내구성과 신뢰성이 높아 대용량 발전소의 비상 발전기뿐 아니라 제한된 도서지역의 발전용으로 유용하게 사용되고 있다. 그러나 디젤엔진에 고진동이 발생될 경우 엔진 구조물 자체의 손상뿐 아니라 운전 신뢰성을 저해하는 요소가 될 수 있다. 본 논문은 고진동으로 인하여 수년간 출력을 감발하여 운전되었던 대형 발전용 디젤엔진의 고 진동 원인을 분석하기 위하여 수행한 시험 및 해석과 대책 수립에 대하여 기술하였다. 진동의 원인으로는 발전기 축의 비틀림 가진으로 인한 엔진 구조물의 공진으로 분석되었으며 수립된 대책을 시뮬레이션 후 실제 발전소에 적용하여 양호한 진동 저감 결과를 얻을 수 있었다. Diesel engines are widely used as power supplies for isolated islands as well as emergency power supplies for large-capacity power plants because of their rapid response to operation, high reliability, and good durability. However, diesel engines are also vulnerable to damage or degradation of reliability when high levels of vibration are generated in them. This paper shows experiments and analysis for the determination of the causes of high-vibration phenomena in large-scale diesel engines, which have experienced various power decreases over several years because of the high levels of vibration. The main cause of the vibration is identified as the resonance created by the torsional vibration of its crank axis, and the appropriate countermeasures that were designed worked well when applied in field tests.