• Title, Summary, Keyword: EMTP/ATPDraw

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Analysis of Induced Voltage in Parallel Telecommunication Cables from Underground Power Cables (지중송전선로와 병행하는 기설통신선의 유도전압 분석)

  • Lim, Kwang-Sik;Chang, Woo-Seog;Han, Chang-Seok;Hong, Dong-Suk;Yoo, Jin-Seon
    • Proceedings of the KIEE Conference
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    • pp.523-524
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    • 2011
  • This paper covers induced voltage in parallel telecommunication cable with underground power cable to be linked between substations. The simulation was carried out the induced voltage in telecommunication cable according to the transposition of power cables and fault location for various conditions. This study based on the EMTP/ATPDraw with actual underground cable systems while the power cables are in steady state and transient state.

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An Adaptive Reclosing Algorithm to Discriminate between Permanent Fault and Transient Fault using THD of Voltage Waveform (전압파형의 THD를 이용한 영구/일시고장 판별 적응형 재폐로 기법)

  • Lee, Chul-Moon;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.8
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    • pp.1347-1352
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    • 2010
  • This paper presents a new adaptive single-phase auto reclosure (SPAR) algorithm to discriminate between a permanent fault and a transient fault and to minimize a protection dead time. The algorithm precisely detects the extinction of the secondary arc, based on THD's profiles on the faulted phase voltage waveform. The EMTP/ATPDraw program was used to simulate the single phase grounding fault for evaluating the proposed algorithm. And the simulation results show that the proposed algorithm is performing well.

Analysis of Common Grounding Effect during the Transient State in Underground Transmission and Distribution Systems (지중송배전계통에서 과도상태시 공통접지의 영향 분석)

  • Lim, Kwang-Sik;Lee, Jong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.2
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    • pp.191-197
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    • 2008
  • This paper describes the effect of transient state in underground transmission and distribution lines installed together in the same tunnel. Two systems installed in the same tunnel are operated by the common grounding. This paper analyzed that how much one of the two kinds of systems influences the other systems during the transient state by EMTP/ATPDraw. Single line-to-ground fault and lightning surge were selected in transient state condition. These cases were simulated variously according to the variation of common grounding magnitude, fault location and lightning surge magnitude. It is evaluated that the analyzed results will be used for establishment and operating materials of common grounding in the same tunnel.

A Study on Recloser Operation According to Recovery Characteristics of Superconducting Fault Current Limiter (초전도 한류기 회복특성에 따른 재폐로 차단기 동작 연구)

  • Rhee, Sang-Bong;Kim, Chul-Hwan;Kim, Kyu-Ho;Kim, Jae-Chul;Hyun, Ok-Bae
    • Proceedings of the KIEE Conference
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    • pp.379-380
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    • 2008
  • For proper application and operation of a SFCL(Superconducting Fault Current Limiter), the prior investigation of fundamental characteristics and its effects to the distribution systems are needed. In this paper, the resistive type SFCL and recloser were developed by using EMTP/ATPDraw and MODELS language. To analyze the effect of recovery characteristics of SFCL according to recloser operation in distribution systems, case studies have been simulated and investigated.

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Asymmetry Components Reduction using Superconducting Fault Current Limiter Operation in Transient Period (비대칭 고장전류 저감을 위한 초전도 한류기 동작 분석)

  • Rhee, Sang-Bong;Kim, Chul-Hwan;Kim, Kyu-Ho;Kim, Jae-Chul;Hyun, Ok-Bae
    • Proceedings of the KIEE Conference
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    • pp.381-382
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    • 2008
  • This paper presents a novel scheme for reducing an asymmetry current with SFCL (Superconducting Fault Current Limiter) operation during transient period, when a fault occurs in power systems. The main idea is installation an auxiliary SFCL with characteristics, which reduces the asymmetry fault current in first half cycle before the operating of main SFCL. For proper activities of SFCLs, the principle of asymmetry current nature is reviewed. A scheme of asymmetry components reduction with SFCL is then explained. The EMTP/ATPDraw model of SFCLs using MODELS language developed and simulated to verify the performance and effectiveness.

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System Effects by Operation Characteristics of Superconducting Fault Current Limiters in Distribution Systems (배전계통 초전도 한류기 동작특성에 따른 계통 영향 분석)

  • Rhee, Sang-Bong;Kim, Chul-Hwan;Kim, Kyu-Ho;Kim, Jae-Chul;Hyun, Ok-Bae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.7
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    • pp.1135-1140
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    • 2008
  • Superconducting fault current limiters (SFCL) have been progressing due to the development of superconducting technology. The resistor type SFCL is one of the promising current limiting devices in power system for its effective operation. For proper application and operation of a SFCL, the prior investigation of fundamental characteristics and its effects to the distribution systems are needed. The most important current limiting behavior of a SFCL is dominated by quenching and recovery characteristics. In this paper, the resistive type SFCL was developed by using EMTP/ATPDraw and MODELS language. The operating characteristics and current limiting behaviors of the SFCL in distribution systems have been simulated and investigated.

Transient State Analysis in Case of Lightning Arrester Deterioration due to Lightning Surge (뇌서지로 인한 피뢰기 열화시 과도상태 분석)

  • Lim, Sung-Yong;Kim, Kyu-Ho;Rhee, Sang-Bong;Kim, Soo-Bae
    • Proceedings of the KIEE Conference
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    • pp.276-277
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    • 2015
  • As the effect of global warming continues, surge rates in Korea are also getting increased. Although there are devices to protect distribution line from the surge like lightning arrester, insulation of the lightning arrester can be destroyed if frequent surge occurs in distribution line. This paper assumed that the lightning surge hits the lightning arrester and make this device's insulation destroyed. This paper also simulated these processes utilizing EMTP/ATPDraw and verified voltage behavior when faults such as line to ground fault due to frequent lightning surge occur in lightning arrester.

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An Algorithm for Electric Vehicle Charging in PV integrated Power System (태양광 발전 연계 계통에서의 전기자동차 충전 알고리즘)

  • Lee, Woong-Hee;Kim, Jun-Hyuk;Lee, Soon-Jeong;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • pp.341-342
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    • 2015
  • Attention has been focused on how to charge an electric vehicle in accordance with the increase of interest in the electric vehicle in recent years. The charging of an electric vehicle with a solar power is way to increase the stability of the grid and to supplement the grid power demand. In this paper, the EMTP / ATPDraw presents a method of charging an electric vehicle in connection to the grid and the solar power system, and analyze the trends in supply power from the solar power system according to changes in temperature and irradiation.

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Open-Phase Condition Detecting System for Transformer Connected Power Line in Nuclear Power Plant (원자력발전소 변압기 연결 선로 결상 검출 시스템)

  • Ha, Che-Wung;Lee, Do-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.2
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    • pp.254-259
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    • 2015
  • On January 30, 2012 an auxiliary component of Byron Unit 2 was tripped on bus under voltage. The cause of the event was the failure of the C-phase insulator track for the Unit 2 station auxiliary transformer(SAT) revenue metering transformer. In addition to this event, other events have occurred at other plants resulting in an open-phase condition.[1] Therefore, Nuclear Regulatory Commission(NRC) has requested that not only nuclear power plant(NPP) operating company but also its Design Certification(DC) applicant have to prepare open-phase detecting system in their operating plants and design document. In this paper, various open-phase conditions are simulated in NPP using Electromagnetic Transient Program(EMTP) and Atpdraw, and open-phase condition detecting system is proposed for Main Transformer(MT), Unit Auxiliary Transformer(UAT) and SAT connected power line in NPP.

A Study on the Reduction of Sheath Circulating Current in Underground Transmission Systems (지중송전계통의 시스순환전류 저감에 관한 연구)

  • Jung, C.K.;Hong, D.S.;Lee, J.B.;Kang, J.W.;Yu, C.H.;Kang, W.T.
    • Proceedings of the KIEE Conference
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    • pp.29-33
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    • 2001
  • Sheath circulating current results from the change of sheath mutual impedance which is caused by unbalanced cable system, and different section length between joint boxes. If circulating over current flows in sheath, it produces much sheath loss which reduces the transmission capacity. And also such large sheath current influences severely on the operator. Recently, large sheath circulating current was partially measured in underground cable system of KEPCO. Accordingly, actual schemes to reduce sheath circulating over current is urgently required for installed cable system as well as newly-constructing cable system. This paper describes the analysis of sheath circulating current and various schemes to reduce the large circulating current in case of operating cable system using EMTP/ATPDraw. And also, possible 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 large sheath circulating over current with the minimized electrical problems.

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