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혼합송전계통에서 지중선로구간이 GIL 또는 XLPE 케이블의 경우 해석을 통한 특성비교 및 평가
장화윤(Hwa-youn Jang),이종범(Jong-beom Lee),정채균(Chae-Kyun Jung) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper describes the domestic GIL (Gas Insulated Transmission Lines) System to introduce of the actual system 345㎸ GIL for the development and application of research. so, compared with the results of the system mixed overhead line and XLPE power cable.
GIL-가공송전선로 혼합운용시 과도 특성 해석 및 평가
장화윤(Hwa-youn Jang),이종범(Jong-beom Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper describes the domestic GIL (Gas Insulated Transmission Lines) System to introduce the actual system 345㎸ GIL for the development and application of research. so, analyzed results of the system mixed overhead line power cable and the lighting overvoltage are also discussed according to surge arrester installation in combined transmission systems when the lighting strikes on the phase conductor.
345㎸급 GIL이 연계된 혼합송전선로의 뇌서지해석 및 평가
장화윤(Hwa-Youn Jang),이종범(Jong-Beom Lee),김용갑(Yong-Kap Kim),정채균(Chae-Kyun Jung) 대한전기학회 2010 전기학회논문지 Vol.59 No.11
This paper describes the characteristic and effectiveness of combined GIL transmission line through lightning surge analysis. In addition the XLPE cable is analyzed in the same condition to compare with GIL. Lighting surge analysis is carried out by EMTP/ATP-Draw to obtain overvoltage of GIL and XLPE cable at service-point and load-out area of underground line. Propagation velocity is calculated in combined transmission lines with GIL and XLPE cable. The overvoltage is also analyzed on GIL and XLPE cable with or without arrester operation. The Analysis results show that overvoltage of GIL is occurred higher than XLPE cable at the same condition. Therefore it is evaluated that the application of GIL at the field should be considered cautiously when more detailed transient analysis, another electrical testes and economic evaluations are implemented.
345kV급 가공송전선로와 GIL이 연계된 혼합송전계통에서 개폐과전압 해석 및 검토
장화윤(Hwa-Youn Jang),이종범(Jong-Beom Lee),김용갑(Yong-Kap Kim),장태인(Tae-In Jang) 대한전기학회 2011 전기학회논문지 Vol.60 No.10
This paper describes switching surge analysis for reclosing decision in 345kV combined transmission line with GIL. Reclosing operation should be decided based on the detailed technical analysis in combined transmission line because this line includes power cable section which is week on insulation. Insulation of power cable can be breakdown at the week point in case of reclosing moment. Therefore the detailed analysis has to be carried out by considering several conditions such as charging rate, inserting resistance, arrester, length ratio of power cable section, grounding resistance, etc. Analysis is performed by EMTP/ATP.
22.9kV 지중배전 케이블 선로에서 종단 변압기 연계에 따른 부분방전 전파특성 연구
정석산(Seok-San Jeong),장화윤(Hwa-Youn Jang),이종범(Jong-Beom Lee),김정태(Jeong-Tae Kim) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.10
This paper studies on the validity about a partial discharge of power cable to develop a transient analysis program on power system by using 3 PARD technics. Because an experiment of partial discharge on the power cable is too difficult to realize various cases about pulse characteristics. There fore this study comprises cable modeling which is difficult to realize on the real power system and calculates the characteristic impedance, propagation velocity and decrement constant using EMTP/ATPDraw. This paper studies on pulse characteristic both a installation of transformer and a removal of transformer at the terminal of cable.
혼합배전계통에서 순환전류 저감을 위한 개선된 중성선 접지방식
정석산(Seok-San Jeong),장화윤(Hwa-Youn Jang),이종범(Jong-Beom Lee) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.10
In 22.9 Combined distribution system, power cable are provided with multiple-point ground in which each neutral line of the distribution cable(A, B, C phases) and three-wire common grounded at every connecting section, But in such grounding methods, circulating current flows between the neutral wire and grounding wire. And power loss due to circulating current also occurs in all conductors. Therefore it is getting necessary reducing circulating current in Combined ground system. This paper presents improved grounding method to overcome such problems. The proposed grounding method eliminates circulating current in the neutral line effectively and is verified that there is no electrical problem or any ineffectiveness of operating protection systems. These analyses are carried out by EMTP/ATPDraw to compare each grounding methods in steady and transient state. This grounding method suggested in this paper can be applied on real distribution system after field tests considering elimination of circulating current was implemented.