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발전소 전력계통 계기용변압기(VT) 신뢰성 향상을 위한 연구
김순용(Soon-Yong Kim),박진엽(Jin-Yeub Park),정필범(Pil-Bum Jeong) 대한전기학회 2020 전기학회논문지 P Vol.69 No.1
Voltage Transformer supplies Low Voltage Signals that are step downed from High Voltage to Voltage Meters and Protective Relays. The failures of Voltage Transformers cause to occur Trip events in Power Plants. This study analyzes the failure mechanism and possibility in the VT Design & Manufacturing process . And also, this study reviews the effects of the Switching Surge and Ferro Resonance that are occurred when the Circuit Breakers are opening/ closing in the operating environments. and then proposes an improved methods to make the Voltage Transformer with high reliability.
발전소 고압배전계통 계기용변압기 Fuse 손상 메커니즘 및 대책
김순용(Soon-Yong Kim),박진엽(Jin-Yeub Park),정필범(Pil-Bum Jeong) 대한전기학회 2020 전기학회논문지 Vol.69 No.10
Power Fuses that are installed to protect for Voltage Transformer had been burnt out by operating environments, the characteristic of fuse and aging in power plants. To analyzes the root causes of fuse failures, this study reviews the appropriateness of the fuse selection according to the VT rating and capacity, the effects of inrush current that may occur during VT power up and the possibility of resonance due to poor VT excitation characteristics. In addition, the internal condition and the blown-off melt shape of the burned-out fuse were confirmed by the industrial X-ray, the electron microscope, and the material analysis.
김순용 ( Soon Yong Kim ) 한국부동산분석학회 2016 不動産學硏究 Vol.22 No.2
In this study, research is being conducted to better understand changes of the dynamic factors in rent-price ratio. To implement Campbell and Shiller``s dynamic Gordon growth model, the Vector Autoregressive Model(VAR) is used to estimate the expected future rent growth and real interest rate. Applying the dynamic Gordon growth model to the housing market allows the rent-price ratio at each date to be decomposed into the expected present discounted values of rent growth, interest rate and risk premium over real rates, and identify shares of these factors volatility in rent-price rato total volatility. As a result, real economic factors such as actual rents rather than finance factors such as the risk-free interest rate and risk premium were more important in house price fluctuations. Changing internal and external conditions such as the global financial crisis in the housing market contributes to change the covariances among the three components - expected risk-free interest rate, expected risk premium, expected rent growth.