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154 kV급 변압기 절연물 앵글링과 캡의 최적성형 기술 개발
서왕벽,김종원,유정수,배동호,Suh, Wang-Byuck,Kim, Jong-Won,Ryu, Jung-Soo,Bae, Dong-Ho 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.11
The Angle Ring and Cap which is called pressboard are settled at the primary and secondary coil winding of 154 kV transformer that can reduce effectively distance of insulation. As it has not manufactured pressboard of Angle Ring and Cap for high voltage grade, insulation components industry especially high voltage transformer has not participate in a competition with worldwide yet. That's why is difficult to make an specialized shape of insulation components of high voltage grade. Therefore it has finally completed to make an deformation manufacturing utility using an bellowed special analysis tools. This study that uses various analysis program determining optimum shape about insulation of Angle Ring and Cap which is related life of high voltage transformer. In addition to develop forming equipment with an specialized five steps pressing. That is also based on the mechanical strength evaluation and test, it is investigated optimized processing components.
와전류 손실을 적용한 금형으로 제조된 초고압 변압기의 프레스보드의 절연 특성 연구
서왕벽,Suh, Wang-Byuck 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.8
Some insulating materials are tested and analyzed with variables to obtain the reliable pressboard which is located to core and coil of high voltage transformer. The high voltage transformer is used in electrical power system and operating reliability. Optimization possibility of pressboard shape including electrical insulation performance could be achieved by analysis simulation. Using insulating pressboard, which is made by mold applied eddy current loss, it could be measured the influences of moisture content for electrical properties. As a result, it is to contribute to improve the performance and ensure the reliability of the pressboard by investigating electrical strength according to the variation oil temperature. In addition pressboard thickness is important design factor to ensure electrical strength in high voltage transformer.
SiO<sub>2</sub>와 Al<sub>2</sub>O<sub>3</sub>를 충진재료로 사용하는 초고압 GIS용 에폭시 절연물 베리어의 전기적 및 기계적 특성에 관한 연구
서왕벽,배동호,Suh, Wang-Byuck,Bae, Dong-Ho 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.6
Some insulating materials are organized and analyzed with variables to obtain the optimized profile of encapsulated three phase of epoxy barrier which is applied to gas compartment and supporting conductors for high voltage GIS (gas insulated switchgear). The high voltage GIS is used in electrical power system and operating reliability. In this paper, optimization possibility of barrier shape including both electrical insulation performance and mechanical strength, premised on that condition minimizing volume and light weight should be kept for high voltage GIS, could be achieved by analysis simulation. As a result, filling material which is lower permittivity such as $SiO_2$ instead of $Al_2O_3$ properly to the epoxy material, can be improved to increase the electrical insulation performance and mechanical strength for an optimized profile barrier of a high voltage GIS.
서왕벽,Suh, Wang Byuck 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.10
In this study, an epoxy insulation barrier for high voltage GIS was developed using epoxy and a filler with a Young's modulus of 11 GPa. The material was investigated using a simulation of the principal stress, displacement, and safety factors while optimizing the profile shape. The simulation showed that thelarger Young's modulus of the $Al_2O_3$ filler compared to the $SiO_2$ in the epoxy insulation can contribute to an increase in resistance to mechanical fracturing for theoptimized profile barrier in high voltage GIS. In addition, the safety factor was improved by 10%. It can be concluded that the mechanical fracturing properties of the insulation barrier can be enhanced by increasing the content of the elastic filler, $Al_2O_3$, for high voltage GIS applications.
온도와 습도에 따른 초고압 변압기용 앵글링 프레스보드 특성
서왕벽 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.1
In this study, to develop angle ring pressboards for high voltage transformers, the radius and thickness are modified under the conditions of temperature and humidity. In particular, a pressboard with a thickness of 6 mm and a radius at the angled part were investigated based on the simulation of the principal stress from the angled optimization profile shape. As a result, by the appropriate application of a higher temperature, the solid insulation can be improved to reduce the moisture content for an optimized profile angle of a high voltage transformer. This also results in the improvement of the safety factor by 25%. It is determined that the electrical insulation properties of pressboards in high voltage transformers can be enhanced by improving their properties. 본 연구에서는 초고압 변압기용 앵글 링 프레스 보드를 개발하기 위해 온도와 습도 조건에서 곡률반경과 두께를 개선 하였다. 특히 6mm 두께의 프레스 보드는 굴곡진 최적화 프로파일 형태의 주요 응력 해석 시뮬레이션을 사용하여 연구되었다. 결과적으로, 초고압 변압기의 최적화 형상의 각도에 대한 흡습률 특성을 감소시키기 위해 고체 절연체에 대한 적절한 온도로 개선 될 수있다. 안전성 또한 25 % 향상되었다. 초고압 변압기에서보다 개선 된 프레스 보드의 전기 절연 특성도 향상시킬 수 있다.
개방 속도를 증가하기 위한 전자석 조작기 가동부 설계 특성에 관한 연구
서왕벽,김대업 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.2
In this study, magnetic characteristics of two models of permanent magnet actuator applied and used in the Recloser were studied, and the new model design was verified using numerical analysis on the operation and current characteristics of the magnet actuator accordingly. Such as the Recloser require fast operation characteristics to open the fault current, so when the moving and fixed contacts of a magnet actuator with permanent magnets that generate holding force come into contact, a high holding force is required, and when it open to circuit, the magnetic force is rapidly reduced. It demands very high performance. Therefore, the speed characteristics and current characteristics of the contact points of the magnet actuator for which the design was completed were compared.
Development of a press-forming technology of the pressboard for a 154 kV transformer
서왕벽,Jae Yun Yim,배동호 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.7
A pressboard consisting of an angle ring and a cap is installed at the primary and secondary coil windings of a transformer. This pressboard is related to transformer durability. Since transformer capacities are increasing, it is necessary to develop a pressboard of high voltage grade (above 150 kV). In this study, a press-forming technology was developed for the pressboard of a 154 kV transformer. To determine the optimum shape of the pressboard, the press-forming factors were experimentally evaluated through the mechanical tensile strength and AC withstand voltage tests under wet conditions. From the results, the optimum size and shape of the pressboard was found to be R15~R20 mm under a forming pressure of 10 MPa. When the relative humidity (RH) was less than 50%, the moisture absorption rate in oil decreased by 25~40% compared to that in air. However, when RH exceeded 50%, the difference in the moisture absorption rate between the cases of oil and air was just 8~10%. The AC withstand voltage of the pressboard was weak against moisture. The average AC withstand voltage at 40°C and RH of less than 50% decreased by about 15% compared to the dried condition, and the maximum value decreased by 30% at 40°C and RH of more than 50%.
승용차용 히터 코어 및 증발기의 성능 개선을 위한 메타모델 기반 최적화 연구
김대업,서왕벽 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.3
In this study, optimizations were carried out for a heater core and an evaporator installed in a passenger car. The main geometric parameters of each component were selected as design variables, and the main performances examined were the outlet temperature and the pressure drop. In addition, the sensitivity analysis was performed to grasp the dominant design variable. The thermal flow analysis for each component was performed using the commercial program STAR CCM+. On the other hand, EasyDesign, a commercial program based on DOE and metamodel-based optimization, was used as an optimization tool. The optimized performances of the heater core were compared with performance target, and finally, the improved designs of the heater and the evaporator were presented.