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발전기 고정자 권선 절연재 흡습 특성에 관한 실험적 연구
배용채(Y. C. Bae),이대성(D. S. Lee),김희수(H. S. Kim),김연환(Y. H. Kim),이현(H. Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Leaking water coolant into stator electrical insulation is a growing concern for the aging water-cooled generator since leaks in the generator water-cooled stator winding can affect machine availability and insulation life. But a domestic techniques of such field are insufficient and depend wholly on GE or TOSHIBA technique. Therefore this paper introduces measuring principle and developed measuring system, which has been used to detecting wet absorption. We accomplished the experiment with a stator promotion of virtue which is used in actual power plant. Also, Experimental method of generator stator winding, which is investigated into wet absorption test.
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.
여러 가지 확률분포를 이용한 발전기 고정자 권선의 흡습 시험에 관한 연구
김희수,배용채,김희정,나명환,Kim, Hee-Soo,Bae, Y.C.,Kim, Hee-Jeong,Na, Myung-Hwan 한국통계학회 2009 응용통계연구 Vol.22 No.5
Water absorption in water-cooled generator stator windings can cause serious accidents such as insulation breakdown and it brings a generator to the unexpected sudden outage. Accordingly, it is important to diagnose the water absorption of them in the effective operation of power plant. Especially, the capacitance value which is measured for diagnosis is very small so the special diagnosis methods like stochastic theory are needed. KEPRI developed the water absorption test equipment and diagnosis technology for them. In this paper we propose that water absorption test of generator stator windings using probability distributions. The proposed diagnosis technology is applied to the real system and the results of water absorption test for stator windings are agreed to them of water leak test. 발전기 고정자 권선의 냉각수 누수는 발전기 운전 중 절연 파괴를 발생시켜 발전소 불시정지를 발생시킬 뿐만 아니라 권선 손상에 따른 정비 기간 및 비용이 매우 많이 소요된다. 따라서 발전기 고정자 권선의 냉각수 누수가 발생하였을 때 재앙이 일어나기 전에 고정자 권선 절연물의 흡습 상태를 진단하는 것은 예방 정비 측면에서 매우 효과적인 정비 방안이라고 할 수 있겠다. 본 논문에서는 발전기 고정자 권선에 흡습여부를 알아보기 위하여 여러 가지 확률분포를 이용하여 판정기준값을 유도하였다. 또한, 유도된 판정기준값을 바탕으로 실제 관측된 자료를 이용하여 흡습여부를 판단하였다.
Design and Construction of 10 kWh Class Flywheel Energy Storage System
정세용,한상철,한영희,박병준,배용채,이욱륜,Jung, S.Y.,Han, S.C.,Han, Y.H.,Park, B.J.,Bae, Y.C.,Lee, W.R. The Korean Superconductivity Society 2011 Progress in superconductivity Vol.13 No.1
A superconductor flywheel energy storage system (SFES) is an electro-mechanical battery which transforms electrical energy into mechanical energy for storage, and vice versa. A 10 kWh class flywheel energy storage system (FESS) has been developed to evaluate the feasibility of a 35 kWh class SFES with a flywheel $I_p/I_t$ ratio larger than 1. The 10 kWh class FESS is composed of a main frame, a composite flywheel, active magnetic dampers (AMDs), a permanent magnet bearing, and a motor/generator. The flywheel of the FESS rotates at a very high speed to store energy, while being levitated by a permanent magnetic bearing and a pair of thrust AMDs. The 10 kWh class flywheel is mainly composed of a composite rotor assembly, where most of the energy is stored, two radial and two thrust AMD rotors, which dissipate vibration at critical speeds, a permanent magnet rotor, which supports most of the flywheel weight, a motor rotor, which spins the flywheel, and a central hollow shaft, where the parts are assembled and aligned to. The stators of each of the main components are assembled on to housings, which are assembled and aligned to the main frame. Many factors have been considered while designing each part of the flywheel, stator and frame. In this study, a 10 kWh class flywheel energy storage system has been designed and constructed for test operation.