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조용선(Yong-Sun Cho),최효상(Hyo-Sang Choi),정병익(Byoung-Ik Jung),고성필(Sung-Pil Go) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
The matrix-type superconducting fault current limiter (MSFCL) consists of the trigger and current-limiting parts. The trigger part with reactors connected in parallel improves the quenching characteristics by applying the external magnetic field into the superconducting units. The current-limiting part with superconducting units connected in parallel and shunt reactors connected in series limit the fault current when the fault occurs. We developed the integrated reactor with the trigger and the current-limiting parts to apply high external magnetic field into the superconducting units. This was composed of a superconducting unit for the trigger part and two superconducting units for the current-limiting parts. We confirmed that the external magnetic field generated in the MSFCL with an integrated reactor was larger than that of the MSFCL with the separated reactors. So the differences of voltages generated between superconducting units were decreased in the difference according to the increment of the applied voltage. The whole magnitude of the SFCL was reduced because the volume of an integrated reactor could be reduced by one-third than that of the separated reactors. We confirmed that the critical behavior between the superconducting units in the MSFCL with an integrated reactor was more improved than that of the MSFCL with the separated reactors.
피크전류 제한 기능을 갖는 초전도 한류기 도입에 따른 보호기기의 동작특성
조용선(Yong-Sun Cho),김명현(Myong-Hyon Kim),김진석(Jin-Seok Kim),임성훈(Sung-Hun Lim),김재철(Jae-Chul Kim) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.10
In the existing power distribution system, a resistive type SFCL was great burden from fault current and was required higher cooling cost. The suggested SFCL with a peak current limiting function, on the other hand, can overcome the shortcomings of the resistive type SFCL. In this paper, the characteristic of the protection devices due to the introduction of superconducting fault current limiter (SFCL) with a peak current limiting function was analyzed through the PSCAD/EMTDC modeling.
2차 권선과 초전도 사이의 중성선 유무에 따른 변압기형 초전도 한류기의 동작특성
조용선(Yong-Sun Cho),최효상(Hyo-Sang Choi),고성필(Sung-Pil Go) 대한전기학회 2011 전기학회논문지 Vol.60 No.6
The study on power capacity increase of superconducting fault current limiter (SFCL) is one of the most important researches to apply a SFCL in the power system. To achieve this, we thought that the unbalanced quenching problem generated in series connection of superconducting units should be solved. In this paper, we investigated the quenching characteristics of superconducting units in the transformer-type SFCL with or without the neutral line between secondary windings and superconducting units. In case of transformer-type SFCL without neutral line, the connection structure of superconducting units is identical to that of the resistive-type SFCL connected in series. Therefore, the unbalanced quenching was occurred by difference of critical current between superconducting units. However, in case of transformer-type SFCL with neutral line, the superconducting units with different critical current were simultaneously quenched. It was because the currents induced by secondary winding were separately flowed through the superconducting units. By these results, we confirmed that the resistances and consumption powers of the superconducting units were equally generated.
삼상 매트릭스형 초전도 한류기의 사고주기별 회복특성 분석
조용선(Yong-Sun Cho),정병익(Byung-Ik Jung),최효상(Hyo-Sang Choi),정동철(Dong-Chul Chung),유병화(Byoung-Hwa Yoo) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
초전도 한류기의 회복특성은 상전도 상테로 ?치된 초전도체가 다시 초전도 상태로 회복하는 시간을 나타내는 특성이다. 이러한 분석은 전력계통 내의 각종 시스템과의 보호협조를 결정하는 중요한 요소이다. 본 논문에서는 1×3구조를 갖는 삼상 매트릭스형 초전도 한류기를 구성하여 3선 지락사고의 주기에 따른 초전도체의 회복특성을 분석하였다. 사고 주기가 작아질수록 초전도체의 회복시간은 짧아진다는 것을 실험을 통해 확인하였다. 이는 사고 주기가 작을수록 초전도체가 받는 열에너지가 작아 회복시간도 작아진다는 것을 확인할 수 있었다.
조용선(Yong Sun Cho) 장로회신학대학교 세계선교연구원 2008 선교와 신학 Vol.22 No.-
교육 목회에 있어서 설교, 예배, 가르침, 선교, 봉사 등의 긴밀한 관계와 균형이 중요함에도 불구하고, 한국 교회는 말씀에 치우친 경향이 있었다. 이 논문은 특별히 교육과 선교의 관계와 역할에 초점을 두고 있다. 중세 경건주의는 하나의 좋은 예이다. 경건주의는 여러 형태로 나타났는데 슈페너와 루터 경건주의, 분리주의적 경건주의, 뷔템베르그 경건주의 등이다. 그 중에서 특히 프랑케의 할레 경건주의는 교육과 선교를 중시하였다. 프랑케는 인간은 교육을 받아야 하고, 자연적 상태에서 은혜의 상태로 옮겨 가야 한다고 강조한다. 그는 학교를 많이 세워서 습관화, 교리문답 교육, 학생의 삶에 맞는 방법 등을 통해 교육하였고, 학생들의 실천과 적용을 강조하였다. 학생들은 실제로 학업 중에 고아 학교 교사로 봉사하였다. 할레 대학에서 공부한 학생들 중에 많은 선교사들이 배출되었다. 프랑케의 영향력은 할레 대학, 독일 개신교를 넘어 세계로 뻗어 나갔다. 할레-덴마크 선교회는 선교사들을 인도, 러시아 등지로 파송하기에 이르렀다. 프랑케에게 있어서 교육과 선교의 목적은 하나님께 영광을 돌리는 일이며, 하나님의 사역이었다. 그는 ‘교육’ (디다케)을 통해 신앙과 삶의 변회를 실현하려 하였고, 이것은 국내외 선교의 장으로 자연스럽게 이어졌다. 할레 경건주의의 교육과 선교가 긴밀한 관계를 유지하며 사역의 열매를 맺은 것처럼, 이러한 중요한 연관성을 한국 교회도 인지해야 할 것이다. Even though it is important that an educational pastorate maintain harmony and balance in preaching, chapel, teaching, mission, and service, Korean churches have been putting uneven emphasis on sermon delivery (i.e. Kerygma). This thesis will especially focus on the function of education and mission, and their relationship with each other. Pietism of the Middle Ages is a great example that shows the importance of missionary work. There are several types of Pietism: Spener and Luther’s Pietism, Separateistic Pietism, and Wuerternberg’s Pietism. Among them, Halle-Pietism under Franke focused especially on education and mission. Franke emphasized how a human being should get educated to change himself from the natural state to the state of grace. He also claimed that it is important to take into consideration what a student went through his or her life. In addition, he argued that it is important to educate students on catechism, and make education habitual. To achieve this goal, he founded many schools in which practice and application were emphasized. Theology students were required to serve in schools for orphans. Many missionaries have been produced among those who studied at Halle University. Franke’s influence started from Halle and went beyond German Protestantism to the international sphere. Halle-Denmark Missionary Association sent missionaries to India, and Halle-Pietism expanded its territory of mission to Russia. There was an intimate relationship between Halle-Pietism’s education and mission which produced fruit of ministry. This important relationship should also be recognized in Korean churches.