• Title/Summary/Keyword: 345kV power system

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A study on SFCL application for 154kV power system interconnection of 345kV S/S in Korean power system (국내 345kV 변전소 하위 154kV 계통 연계지점 SFCL 적용방안에 관한 연구)

  • Lee, Seung-Ryul;Kim, Jong-Yul;Yoon, Jae-Young
    • Proceedings of the KIEE Conference
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    • 2005.11b
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    • pp.340-343
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    • 2005
  • This paper is for studying the feasibility of SFCL application for the interconnection operation of 154kV power systems under 345kV S/S in Korean power system. All Korean 154kV power systems are constructed as loop systems in downtown. However, the present 154kV systems are operated with separated systems around 345kV S/S because of fault current and overload problems. In this study, we investigate the structure and operation of 154kV power system in Seoul and study the feasibility of interconnection operation of 154kV systems under 345kV systmes by applying SFCLs to 154kV bus-tie.

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A study on SFCL application for the interconnection operation of 154kV power systems under 345kV S/S in Korean power system

  • Lee Seung Ryul;Kim Jong Yul;Yoon Jae Young
    • Progress in Superconductivity and Cryogenics
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    • v.7 no.2
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    • pp.47-51
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    • 2005
  • This paper is for studying the feasibility of SFCL application for the interconnection operation of 154kV power systems under 345kV S/S in Korean power system. All Korean 154kV power systems are constructed as loop systems in downtown. However, the present 154kV systems are operated with separated systems around 345kV S/S because of fault current and overload problems. In this study, we investigate the structure and operation of 154kV power system in Seoul and study the feasibility of interconnection operation of 154kV systems under 345kV systmes by applying SFCLs to 154kV bus-tie.

EMTP simulation of 345kv Substation in large network using newly developed Thevenin equivalent network (345kv 미금 변전소 외부 계통의 등가축약 기법을 이용한 EMTP 모델링에 관한 연구)

  • Jeong, Ki-Seok;Baek, Young-Sik
    • Proceedings of the KIEE Conference
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    • 2008.11a
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    • pp.244-246
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    • 2008
  • EMTP-RV is the very powerful program to analyze the dynamic operation of the power system. To use this package in the large complex power system, it is very important to simplify the power system to simple equivalent network. In our study the 100 MVA STATCOM is placed at 345kV "MIGUM" which is the one of the 345kV substations of the Korean Electric Power System that is consist of more than 1000 bus. MIGUM substation is connected with 7 separated transmission lines to main Korean Electric power system. We developed a new method to simplify the network except the substation that we want to analysis. The power system outside the 345kV substation is modeled into the equivalent network. The loop network outside the substation can be modeled to simplified Thevenin equivalent network. The proposed method is applied to IEEE-14 Reliability Test System and the results shows the effectiveness of the method.

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Unbalanced Power System Analysis in 765/345kV Parallel Transmission Line by Using EMTDC (EMTDC를 이용한 765/345kV 병가선로의 불평형 계통 해석)

  • Kim, Jong-Yul;Yoon, Jae-Young;Choi, Heung-Kwan;Lee, Woon-Hee
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.199-201
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    • 2003
  • Because of Korean power system characteristics and increasing power demand, the need of 765kV transmission line is growing gradually. Now a days, KEPCO's 765kV transmission line has been tested and stands for commercial operation. During the first stage, 765kV transmission line will be operated with two voltage grades of 765kV and 345kV, which results the unbalance of power system. So unbalanced current such as zero sequence current flows in the transmission line. In this paper, we describes the simulation study of 765/345kV parallel transmission line by using EMTDC program.

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The Calculation of Lightning Flashover rate of 345kV/154kV Transmission Tower (345kV 및 154kV 송전철탑의 뇌사고율 예측계산)

  • Shim, E.B.;Woo, J.W.;Kwak, J.S.;Min, B.W.;Hwang, J.I.
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.452-454
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    • 2001
  • This paper described the calculation results of lightning flashover rate on the 345kV and 154kV transmission system of KEPCO. The back-flashover rate and shielding failure rate was calculated by FLASH(lightning flashover rate calculation program from IEEE) and KEPRI's own program which is based on the EGM(Electro Geometrical Model) method. The estimated lightning flashover late of 345kV transmission system of double circuit was 1.0 flash per 100km-year, and the lightning flashover rate of 154kV transmission line was 2.0 flash Per 100km-year approximately.

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EMTP Simulation of 345kV Substation in Large Network Using Newly Developed Thevenin Equivalent Network (345kv 미금 변전소 외부 계통의 등가축약 기법을 이용한 EMTP 모델링에 관한 연구)

  • Kwon, Ki-Jin;Jeong, Ki-Seok;Seo, Gyu-Seok
    • Journal of the Korean Society of Industry Convergence
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    • v.14 no.3
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    • pp.121-125
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    • 2011
  • EMTP-RV is the very powerful program to analyze the dynamic operation of the power system. To use this package in the large complex power system, it is very important to simplify the power system to simple equivalent network. In our study the 100 MVA STATCOM is placed at 345kV "MIGUM" which is the one of the 345kV substations of the Korean Electric Power System that is consist of more than 1000-bus. MIGUM substation is connected with 7 separated transmission lines to main Korean Electric power system. We developed a new method to simplify the network except the substation that we want to analysis. The power system outside the 345kV substation is modeled into the equivalent network. The loop network outside the substation can be modeled to simplified Thevenin equivalent network. The proposed method is applied to IEEE-14 Reliability Test System and the results shows the effectiveness of the method.

Over-Excitation Protection Relaying using the 345kV Power System Modeling Data (345kV 계통 모델링 데이터를 활용한 과여자 보호계전기법)

  • Park, Chul-Won;Ban, Yu-Hyeon
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.60 no.4
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    • pp.175-180
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    • 2011
  • A large AC generator is an important component of the power system. It is a need for research of AC generator protection relay for the next-generation ECMS and an efficient operation of protection control system. However, most of protection and control systems used in power plants have been still imported as turn-key and operated in domestic. This may cause the lack of the correct understanding on the protection systems and methods, and thus have difficulties in optimal operation. In this paper, over-excitation protection relaying is one of the protective factors in generator protection IED was presented. The cause and protection principles were dealt and, DFT-based gain compensation algorithm was adopted for the frequency measurement. The Republic of Korea 345kV modeling data by EMTP-RV was used for performance evaluation.

Development of Oil Filled Power Cable for 345kV Line (345 kV OF cable의 개발)

  • Han, K.M.;Choi, M.K.;Lee, I.H.
    • Proceedings of the KIEE Conference
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    • 1988.11a
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    • pp.224-228
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    • 1988
  • Extensive development work which was carried out by Gold Star Cable Co., Ltd. has led to the optimal design, manufacture and test of fully engineered cable system for 345 kV self- contained oil filled (OF) underground cable. Details of design criteria and of tests are given. development of 345kV OF cable results in sucessful operations for ultra-high voltage power transmission requirement.

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Determining the Reference Voltage of 345 kV Transmission System Considering Economic Dispatch of Reactive Power (무효전력 경제급전을 고려한 345㎸ 송전계통의 기준 전압 설정 방법)

  • Hwang, In-Kyu;Jin, Young-Gyu;Yoon, Yong-Tae;Choo, Jin-Boo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.5
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    • pp.611-616
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    • 2018
  • In the cost based pool market in Korea, there is no compensation of reactive power because the fuel cost for reactive power is relatively low compared to that of active power. However, the change of energy paradigm in the future, such as widespread integration of distributed renewable energy source, will prevent the system operator from mandating the reactive power supply without any compensation. Thus, in this study, we propose the reference voltage of the 345 kV transmission system that minimizes the reactive power supply. This is closely related to the economic dispatch of reactive power aiming at minimizing the compensation cost for the reactive power service. In order to verify the effectiveness of the proposed reference voltage, the simulations are performed using the IEEE 14 bus system and the KEPCO real networks. The simulation results show that a voltage lower than the current reference value is recommended to reduce the reactive power supply and also suggest that the current voltage specification for the 345 kV system needs to be reviewed.

Present Development Trends of 345kV XLPE Cables (345kV XLPE 케이블의 개발 현황)

  • Kim, Y.;Park, K.R.;Lee, S.H.;Heo, K.D.;Lee, S.H.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1881-1883
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    • 2002
  • Recently, 345kV XLPE Cable and Accessories have been developed and will be applied for Youngseo$\sim$Youngdeungpo project in Korea. So, let this project and the process of development introduce on this paper. The cable type and length of this project is 345kv XLPE 1C*$2000mm^2$ 66km and all cable will be pulled on cable tunnel. The diameter of cable insulation was designed as 27mm, we could reduce it by appling for hi-tech and super-clean system. Joints were developed by a pre-fabricated type which considered high safety and economic issues. We had also done Pre-Qualification test for verifying the reliance of cable and accessories before construction. As we developed this 345kV XLPE cable system including its accessories at the same time, we can have higher technologies and contribute safe power in transmission lines. In adtionally, we can have a stable status for suppling EHV cable systems to a variety foreign customers by ourselves.

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