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원자력발전소 전력계통 지락고장 해석 및 저전압계전기 보호협조
변상윤(Sang-Youn Byun),진수환(Soo-Hwan Chin),박진엽(Jin-Yeub Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
원자력 발전소에서는 안전과 관련되는 필수부하의 전원공급을 위한 안전모선이 구비되어 있으며 안전모선의 전압을 적절하게 유지하기 위해 저전압계전기가 설치되어 있다. 본 논문은 원자력발전소 고전압계통 고장사례에 대해 모사실험으로 전압강하를 분석하였으며 실제 고장 파형과 비교 분석하였다. 분석결과 모사실험 결과는 저전압계전기 보호협조 분석에 활용할 수 있으며 또한 고압 배전반에 설치되어 있는 저전압계전기 보호협조는 적절한 것으로 분석되었다.
변상윤(Sang-Youn Byun),김순용(Sun-Yong Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Motor bus transfer involves the process of transferring a bus that has several critical motors to an alternate source of power when the main normal power source feeding them is interrupted. Bus transfer is a time-critical application in which the transfer progress depends on various parameters such as the type of motor, load on the motor at the time of transfer, inertia of the motor, and the combined open-circuit time constant of various motors present on the bus at the time of transfer. This paper present the result of modeling and simulation of nuclear power motor bus using ETAP(Electrical Transient Analyzing Program) program for motor and motor bus residual voltage decay characteristics.
고무차륜형식 경전철(AGT) 대차의 구조해석 및 주파수 응답해석
변상윤(Byun Sang-Yun),유형선(Yoo Hyeong-Seon),윤성호(Yun Seong-Ho) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Rubber wheel-type AGT has two major kinds of bogie; one is the bogie type and the other and passenger loads. This paper deals with the statics analysis for two types of bogie frame subjected to combined external forces, as well as independent ones specified in DIC 515-4. Furthermore, the dynamics analysis is performed under vibrational loading conditions so as to compare dynamic characteristics, Numerical results by using commercial packages, I-DEAS and NASTRAN show that maximum stresses do not exceed the yielding level of material used for both bogies. From an overall viewpoint of strength, the bogie type turns out to be superior to the steering type except the case of a lateral loading. It is also observed that the steering type shows a be stiffened. It is strongly anticipated that vibrational fatigue analysis should be carried out under realistic loading conditions closely matching to situations such as running surface and lateral clearances along the guideway.