• Title, Summary, Keyword: EMTP/ATPDraw

Search Result 62, Processing Time 0.045 seconds

A Study on the Reduction Methods of Sheath Circulating Current using the Reduction Equipment in Underground Transmission Systems (지중송전계통에서 저감장치를 이용한 시스 순환전류 저감방안에 관한 연구)

  • Gang, Ji-Won;Yang, Hae-Won
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.51 no.9
    • /
    • pp.474-481
    • /
    • 2002
  • Sheath circulating current is increased in the change of sheath mutual impedance which is caused by unbalanced cable system, and different section length between joint boxes. If excessive current flows in sheath, sheath loss which is reduced the transmission capacity is produced. Recently, excessive sheath circulating current was partially measured in underground cable systems of KEPCO. Accordingly, actual schemes to reduce excessive sheath circulating current are urgently required for installed cable system as well as newly-installing cable systems. This paper describes the relation analysis of sheath circulating current and burying types. And also, various schemes to reduce excessive circulating current using EMTP/ATPDraw and applicable schemes are proposed through a detailed analysis regarding cable systems by considering various electrical and environmental factors. It is evaluated that the proposed reduction schemes can be effectively applied to reduce the excessive sheath circulating current with the minimized electrical problems. And reduction effect is Proved with sheath circulating current reduction equipment.

Modeling and Switching Overvoltage Analysis for Reclosing Analysis in Combined Transmission Systems (혼합송전계통에서 재폐로 해석을 위한 모델수립 및 개폐과전압해석)

  • Lim, Kwang-Sik;Lee, Jong-Beom;Kang, Ji-Won;Jung, Chae-Kyun
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.442-443
    • /
    • 2008
  • This paper describes modeling using the EMTP/ATPDraw for reclosing analysis in 154kV combined transmission systems, and analyzes switching overvoltage. Current transformer established at lead-in area and lead-out area in transmission line and circuit breaker were modeled using TACS in the EMTP/ATPDraw. And also MODELS was constructed by signal processing of the operating reclosing. The simulation was carried out the switching overvoltage according to the length of overhead and underground transmission line, overvoltage between sheath and earth, and voltage between joint boxes.

  • PDF

Modeling of Battery for EV using EMTP/ATPDraw

  • Kim, Jun-Hyeok;Lee, Soon-Jeong;Kim, Eung-Sang;Kim, Seul-Ki;Kim, Chul-Hwan;Prikler, Laszlo
    • Journal of Electrical Engineering and Technology
    • /
    • v.9 no.1
    • /
    • pp.98-105
    • /
    • 2014
  • As environmentally friendly energy takes center stage, interests for Electric Vehicles/Plug in Hybrid Electric Vehicles (EVs/PHEVs) are getting increase. With this trend, there is no doubt EVs will take large portion to penetrations of total cars. Therefore, accurate EV modeling is required. Battery is one of the main components with the power system view of aspect. Hence, in this paper, reviews and discussions of some types of batteries for EV are contained by considering energy density and weight of the batteries. In addition, simulations of Li-Ion battery are accomplished with various variables such as temperature, capacity fading and charge/discharge current. It is confirmed that temperature is the main factor of capacity fading. Validation of the modeled battery is also conducted by comparing it with commercialized battery.

Study of Short-Circuit Currents Around Dĕtmarovice Power Station

  • Ali, Shehab Abdulwadood
    • Transactions on Electrical and Electronic Materials
    • /
    • v.15 no.3
    • /
    • pp.117-124
    • /
    • 2014
  • The calculation of short-circuit currents is important for power systems operation and restoration, and for determining the means to protect human lives and properties. In this paper, a part of a power system network, around the D$\breve{e}$tmarovice power station in Czech Republic, was simulated by the well known program EMTP-ATPDraw (Electromagnetic Transients Program-Alternative Transient Program), and short-circuit currents and voltages were calculated at different points in the electric network and presented as a time function by the PlotXY program. Calculations were done just for phase-to-ground, and for the three-phase short-circuit at the Kun$\check{c}$ice substation. The results were important for determining the characteristics of the equipment required to withstand or break the short-circuit current; for this reason, the calculations were repeated using earth-fault resistances only for the case of busbar KUN shown in Figs. 5 and 6.

Effectiveness Evaluation According to Change of IJ Joint Box Location and Grounding System in Underground Transmission System (지중송전계통에서 절연접속함 위치 및 접지방식 변경의 효용성 평가)

  • Ko, Kwang-Man;Lee, Jong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.64 no.2
    • /
    • pp.247-253
    • /
    • 2015
  • Dielectric breakdown accidents have been mainly occurred in the vicinity of service entrance section in underground power transmission systems. One cause among them is due to the excessive component value of sheath located around service entrance of cable. In this paper, as one of the alternative to prevent these accidents, the change of cross bond grounding system and the location change of IJ(Insulation Joint) are suggested. Also, to evaluate effectiveness of this changing system, circulating current and induced voltage of sheath were analyzed in steady and transient state. By comparison of the analytical results for the several possible changing systems, a grounding system and location of IJ which has the smallest sheath component values is proposed. In this paper, analysis to evaluate the proposed system is carried out by EMTP/ATPDraw. It can be used as a valuable operational material to prevent accident of the service entrance section in underground power transmission system.

New Reclosing Technique in Distribution System with Battery Energy Storage System (BESS가 연계된 배전계통에서 새로운 재폐로 기법)

  • Seo, Hun-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.30 no.1
    • /
    • pp.21-27
    • /
    • 2016
  • The study concerning about the grid connection of the large-capacity battery energy storage system(BESS) is increasing. However, the protection study which is necessary to maintain the reliability of distribution system has been hardly performed. Therefore, this paper analyzes the effect of reclosing among protection issues in distribution system with BESS and proposes the new relcosing method. To verify the proposed method, the BESS, distribution system, and proposed method are modeled by using EMTP/ATPDraw and the various simulations according to the fault clearing time are performed. The simulation results show that the reclosing in distribution system with BESS is successfully performed by proposed method and the operation of BESS is not affected from reclosing.

Transient State Analysis of Faults Caused by Lightning Surge in Distribution Line (뇌서지에 의한 배전선로 고장 시 과도상태 분석)

  • Lim, Sung-Yong;Kim, Kyu-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.1
    • /
    • pp.51-57
    • /
    • 2016
  • This paper presents the voltage characteristics of the various faults after lightning surge hits the overhead grounding wire close to the transformer's secondary side. Based on the modeled distribution system, the cases of the various faults occurred by lightning surge are simulated using EMTP/ATPDraw and maximum overvoltage and RMS voltage according to the distances from the transformer are investigated. As a result, it is seen that the voltage characteristics of faults caused by lightning surge is different depending on the fault type and the voltage characteristics can be used to detect the fault type caused by lightning surge.

Analysis of Lightning-Induced Overvoltage and Current in Buried Underground Distribution Cable using EMTP/MODELS (EMTP/MODELS를 이용한 지중 배전선로의 뇌유도 과전압 및 전류 분석)

  • Seo, Hun-Chul;Han, Jun;Kim, Chul-Hwan;Choi, Sun-Kyu;Lee, Byung-Sung
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.61 no.8
    • /
    • pp.1077-1082
    • /
    • 2012
  • This paper analyzes the lightning-induced overvoltage and current in buried underground distribution cable. Based on analytical expressions, the lightning-induced overvoltage and current in buried underground distribution cable is calculated by EMTP/MODELS. The modeling is verified by comparing with the results in reference. Also, the type and buried arrangement of cables used in domestic distribution line are modeled by EMTP/ATPDraw. The various simulations according to the type and buried arrangement of cable are performed and the simulation results are analyzed.

Analysis of Lightning Surge in the Underground Distribution Systems (지중배전계통에서 뇌서지특성 해석)

  • Lim, Kwang-Sik;Lee, Jong-Beom
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.2219-2220
    • /
    • 2006
  • This paper aims to analyze the overvoltage in underground distribution systems when lightning surge strikes to overhead line. The model is established by EMTP/ATPDraw for actual distribution systems. Simulation is carried out considering variation of parameters such as length and lightning current.

  • PDF

Analysis of Lightning Surge in the Underground Distribution Systems (지중배전계통에서 뇌서지특성 해석)

  • Lim, Kwang-Sik;Lee, Jong-Beom
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.587-588
    • /
    • 2006
  • This paper aims to analyze the overvoltage in underground distribution systems when lightning surge strikes to overhead line. The model is established by EMTP/ATPDraw for actual distribution systems. Simulation is carried out considering variation of parameters such as length and lightning current.

  • PDF