• Title/Summary/Keyword: EMTP-ATPDraw

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An Analysis of Recloser Operation According to Recovery Characteristics of Superconducting Fault Current Limiter (초전도 한류기의 회복특성에 따른 재폐로 동작 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.58 no.5
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    • pp.905-910
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    • 2009
  • For proper application and operation of a SFCL(Superconducting Fault Current Limiter) in distribution systems, the prior investigation of fundamental characteristics and its effects analysis to the systems are very important. A point of view in coordination with recloser in distribution systems, characteristic about quenching and recovering of SFCL should be studied. Especially, its detailed study of recovery characteristic is particularly important to avoid conflict between the SFCL and the recloser. In this paper, the resistive type SFCL and recloser, which used in distribution system, were implemented using EMTP/ATPDraw and MODELS language. To analyze the recovery characteristics of SFCL according to recloser operation in distribution systems, case studies have been simulated and investigated.

Proper Cable Arrangement Selection by Induced Voltage Evaluation of DC Cable in AC/DC Hybrid Combined Transmission Systems (AC/DC 하이브리드형 혼합송전계통에서 DC 케이블의 유도전압평가에 의한 적정배열 선정)

  • Son, Yong-Dae;Lee, Jong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.5
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    • pp.680-688
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    • 2015
  • Hybrid type combined transmission systems is being operated by AC and DC line at the same space will be expanded instead of the overhead line. However, such hybrid type combined system has problem like the arrangement selection of DC cable for effective system operation. In this paper, to select the proper arrangement of DC cable, induced voltage of DC cable influenced by AC cable was analyzed in case of several type arrangement of DC cable. Such induced voltage is in detailed analyzed not only in case of steady, but transient state. The arrangement which has the lowest induced voltage is selected as the proper one. EMTP/ATPDraw is used for modeling and analysis of hybrid type combined transmission system.

Suitability Evaluation on Joint Operation of Neutral Wire and Overhead Grounding Wire through Lightning Surge Analysis in Combined Distribution System (혼합배전계통에서 뇌과전압 해석을 통한 중성선과 가공지선 혼용 운전의 타당성 평가)

  • Jeong, Seok-San;Lee, Jong-Beom;Kim, Yong-Kap;Song, Il-Keun;Kim, Byoung-Suk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.12
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    • pp.2135-2142
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    • 2010
  • This paper studies the validity about a joint operation of neutral wire and overhead grounding wire in combined distribution systems. The overhead grounding wire and neutral wire are currently installed separately and grounded by common. However there is no any ineffectiveness or electrical problem in case of the proposed system, such system can be operated at real distribution system. Therefore this paper describes the suitability of a joint operation through lightning surge analysis on combined distribution systems. Lightning surge analysis is carried out by EMTP/ATPDraw to obtain the overvoltage of overhead line and underground cable in various conditions such as locations and current types of lightning stroke. Overvoltage gained by the analysis show that the insulation strength of the joint operation case is not stable compare with the current operation case.

Effectiveness Evaluation on Combined Connection Operation of OF and XLPE Cable (지중송전계통에서 OF 및 XLPE 케이블 혼용 연계 운용의 효용성 평가)

  • Chea, Jik-byoung;Lee, Jong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.6
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    • pp.857-863
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    • 2015
  • OF cable with excellent reliability and economic efficiency, has been used as the main cable of underground transmission in Korea. However, as XLPE cable is excellent in view points such as reduction of loss, convenience on the construction/operation, and manufacturing technology, it has been replaced as instead of OF cable. Also, when the aging occurs in some sections of OF cable, the section is replaced as XLPE cable without changing of whole cable line. However, there are some differences like electrical constants between both types of cables. Therefore if underground transmission system will be operated as combined connection composited of both cables, it should be proved that overvoltage is stable in steady and transient state. This paper describes the effectiveness of connection operation in combined OF and XLPE cable. For the evaluation of effectiveness, some important analysis such as sheath component voltage, lightning and switching overvoltage, single line-to-ground fault are carried out in steady and transient state. EMTP/ATPDraw is used for modeling and analysis of system.

Proposition of Improved Neutral Grounding Method and Analytical Evaluation on Practicality in Underground Distribution System (지중배전시스템의 개선된 중성점 접지방식 제안과 실효성에 대한 해석적 평가)

  • Jeong, Seok-San;Lee, Jong-Beom;Jang, Seong-Whan;Kim, Yong-Kap;Kwon, Shin-Nam
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.3
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    • pp.479-485
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    • 2011
  • In 22.9kV underground distribution system, power cables 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 underground distribution 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.

A Characteristic Analysis of Superconducting Fault Current Limiter in Power Systems (초전도 한류기 동작 특성에 따른 계통 영향 분석)

  • Rhee, Sang-Bong;Kim, Chul-Hwan;Kim, Kyu-Ho;Hyun, Ok-Bae
    • Proceedings of the KIEE Conference
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    • 2007.11b
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    • pp.207-209
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    • 2007
  • For proper application of the superconducting fault current limiter(SFCL), the prior investigation of fundamental characteristics and its effects to the distribution systems are needed. The Current limiting behavior of SFCL is dominated by quenching and recovery characteristics. So, we have developed an EMTP/ATPDraw model of resistive type SCFL using MODELS language. The operating characteristics and current limiting behaviors of SFCL in distribution systems have been simulated and investigated.

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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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    • 2011.07a
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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 Surge behavior on Branch Line in the Underground Distribution Systems (지중배전계통에서의 분기선로의 서지특성 해석)

  • Lee, Jang-Geun;Lee, Jong-Beom;Lee, Jae-Bong
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.157-158
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    • 2006
  • This paper describes the overvoltage of branch line in underground distribution systems when the direct lightning surge strikes on conductor of overhead line. Distribution systems are very complex because that includes so many branch lines, transformers, switches and so on. Therefor model systems consist of overhead distribution lines, underground cable include branch lines, lightning source and switches. Those are established by EMTP/ATPDraw. Simulation analyzes surge behavior on branch lines considering various conditions in underground distribution systems. Simulation results shoe overvoltage with location in various cases.

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Characteristics of Sheath Circulating Current by Underground Transmission Systems Analysis (지중송전시스템 해석을 통한 시스순환전류 특성 분석)

  • Jung, Chae-Kyun;Lee, Jong-Beom;Kang, Ji-Won
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.449-451
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    • 2002
  • Sheath circulating current rises from the change of sheath mutual impedance which is caused by imbalanced cable system, and different section length between joint boxes. However, mixed burying typo and imbalance section length take many parts of main reasons of sheath circulating current increment in domestic underground transmission power cables. Therefore, the increment reason and variation characteristics of sheath circulating current is analysed with simulation using EMTP/ATPDraw and measuring data of practical cable system which has a problem of exceeding sheath circulating current in this paper.

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