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이상봉(Sang-Bong Rhee),김철환(Chul-Hwan Kim),서훈철(Hun-Chul Seo),고윤태(Yun-Tae Ko),김규호(Kyu-Ho Kim),김재철(Jae-Chul Kim),현옥배(Ok-Bae Hyun) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper presents a asymmetry fault current reduction scheme with recloser operation during transient period. The principle of asymmetry current nature is reviewed and asymmetry components reduction with recloser operation is explained. Throughout the simulation, results verifies the proposed scheme for recloser operation and its effectiveness.
Fischer-Tropsch 반응용 Fe계 압출성형촉매 제조에서의 바인더의 영향
서정환 ( Jeong Hwan Seo ),채호정 ( Ho Jeong Chae ),김태완 ( Tae Wan Kim ),정광은 ( Kwang Eun Jeong ),김철웅 ( Chul Ung Kim ),이상봉 ( Sang Bong Lee ),정순용 ( Soon Yong Jeong ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.6
F-T 반응이 공업적으로 활용되기 위해서는 촉매의 대량 합성 및 성형체의 기계적 강도가 매우 중요한 변수로 적용될 수 있다. 따라서 본 논문에서는 F-T 합성반응용 촉매로 잘 알려진 Fe 계열 촉매의 성형체 제조를 위한 바인더의 영향을 알아보기 위한 연구를 수행하였다. 촉매 바인더로는 무기바인더와 유기바인더를 사용하여 촉매 성형체를 제조하였다. 무기바인더 및 유기바인더의 종류와 함량에 따른 성형촉매의 물리화학적 특성을 XRD, BET, PSD, TPR, UTM으로 분석하였으며, F-T 합성 반응성에 대한 영향을 관찰함으로써 최적의 성형 촉매 제조 조성을 확립할 수 있었다. The technology enabling the large-scale production of catalysts by extrusion is very important for the commercialization of the Fischer-Tropsch process. In this study, the influence of the binder on the extrudate of Fe-based catalyst well known as FT catalysts has been studied. Inorganic binders such as kaolin, bentonite, alumina sol and silica sol and organic binders were added during extrudate preparation. The extrudates have been prepared with various compositions, and the physicochemical properties of the extrudates have been examined by XRD, BET, PSD, TPR and UTM. The optimum binder composition of extrudate was established by comparing the FT reaction activity.
초전도 한류기를 고려한 재폐로 차단기 동작 scheme 개발
고윤태(Yun-Tae Ko),서훈철(Hun-Chul Seo),이상봉(Sang-Bong Rhee),김철환(Chul-Hwan Kim),김재철(Jae-Chul Kim),현옥배(Ok-Bae Hyun) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper proposes the new reclosing scheme considering the recovery time of SFCL in distribution systems which is based on variable dead time control. The main idea is that it uses the carrier signal to distinguish whether the fault is instantaneous or permanent following initial recloser opening. The system and SFCL is modeled by using Electromagnetic Transient Program(EMTP) and the validity of the reclosing scheme represented in this paper is analyzed according to the value of the fault resistance and the time of the fault removal.
Carrier 신호를 이용한 배전계통의 새로운 재폐로 방식
고윤태(Yun-Tae Ko),서훈철(Hun-Chul Seo),이상봉(Sang-Bong Rhee),김철환(Chul-Hwan Kim),김재철(Jae-Chul Kim),현옥배(Ok-Bae Hyun) 대한전기학회 2009 전기학회논문지 Vol.58 No.11
This paper proposes the new reclosing scheme considering the recovery time of SFCL in distribution systems which is based on variable dead time control. The main idea is that it uses the carrier signal to distinguish whether the fault is instantaneous or permanent after tripping the line by recloser. The system and SFCL is modeled by using Electromagnetic Transient Program(EMTP) and the validity of the reclosing scheme presented in this paper is analyzed according to the fault resistance, the recovery time of SFCL and the fault clearing time.
분산전원 연계 계통에 초전도한류기 적용 시 보호협조 분석
서훈철(Hun-Chul Seo),고윤태(Yun-Tae Ko),이상봉(Sang-Bong Rhee),김철환(Chul-Hwan Kim),김재철(Jae-Chul Kim),현옥배(Ok-Bae Hyun) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
The increasing of fault current by introducing of the distributed generation(DG) in distribution system disrupts the protective coordination. Therefore, this paper applies the superconducting fault current limiter(SFCL) to solve this problem. The distribution system with DG and SFCL is modeled by EMTP. According to various size of the DG, the fault is simulated and the operating time of overcurrent relay is investigated accoring to the resistance of SFCL.