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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.
이동전화 서비스 환경에서의 무선데이터 품질평가 방법에 관한 연구
김순용(Soon Yang Kim),김상영(Sang Young Kim),황선명(Sun Myung Whang) 한국컴퓨터정보학회 2004 韓國컴퓨터情報學會論文誌 Vol.9 No.4
최근 이동전화의 대중화로 이동전화 서비스를 제공받고자 하는 이동전화 인구는 폭발적으로 증가하고 있는 추세이다. 또한 CDMA와 같은 휴대용 단말기의 소형화와 경량화, 휴대용 전화를 통한 이동전화 서비스의 필요성이 증가함에 따라 이에 필요한 평가항목 개발과 시험환경 구축이 시급한 실정이다. 본 논문에서는 이에 이동전화 서비스 환경의 필수적인 단말기에 대한 시험원리에 대한 소개와 무선망상에서 사용 되는 시험호인 무선데이터에 대한 전반적인 설명을 하면서 무선데이터를 이용한 품질평가 방법 형태에 대하여 현황과 앞으로의 전망에 대하여 알아보고자 한다.<br/> Recently, Mobile phone became a great member of people. It is increased an use of mobile phone a population. According to mobile phone service. Also a carrying along like CDMA terminal became a small size, a light weight. A phone increased in an environment mobile phone service. For the reason it is demand as necessary evaluation iterms development and test environment construct. In this thesis, mobile phone service an environment is necessary an test principal and interest. wireless network is used Wireless Data. To recommand a Wireless Data quality evaluation method and to look upon next generation.<br/>