• Title, Summary, Keyword: Underground line

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Analysis of Electromagnetic Field Around Distribution Line (배전선로 주변에서의 전자계 분포 해석)

  • Kwon, Myung-Rak
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.10
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    • pp.672-676
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    • 2017
  • Electrical energy is playing an increasingly vital role as the primary energy source in everyday life. With the increase in electric power consumption, power facilities are under an increasing stress and must operate at a high capacity. Consequently, the demand for electric power cables in power transmission and distribution lines is rapidly increasing. Underground distribution lines have been steadily replacing the aboveground lines owing to the increase in electric power demand and the need to increase the supply voltage. In addition to line damage, worker safety is of primary concern in this type of underground infrastructure. In this study, to improve the safety of workers dealing with underground transmission lines, we analyzed the electromagnetic field generated around the distribution line and determined the basic criteria for developing a device that can detect a live underground line.

Verification of Underground Distribution Line Modeling with Field Test (실증시험을 통한 지중배전선로 모델링 기법 검증 연구)

  • Yun, Chang-Sub;Lee, Jae-Bong;Kim, Byong-Suk;Lee, Jong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.12
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    • pp.2091-2097
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    • 2007
  • This paper described the verification of modeling technique of underground distribution from comparison between field test and simulation. It needs more exact transient phenomenon analysis model to establish lightning protection of underground distribution line. Although, there were a lot of transient phenomenon researches, nobody could has verified the confidence of modeling from field tests in interior until now. So, simulation model verified field test is needed to analyse transient phenomenon of underground distribution system. The examination must be accomplished in many different condition before suggesting these verified analysis model. In this paper, the conditions were examined and the various data results on the different line composition was compared with the EMTP simulation, when the lightning impulse test was accomplished at underground distribution line. Also the value between field test and simulation was very closed and the method of modeling has demonstrated confidence, when the method is used to analyse domestic transient phenomenon of underground distribution.

Analysis of Transient Phenomena Considering Arrester in Underground Distribution Line (지중배전선로용 피뢰기를 고려한 과도현상 해석)

  • Yun, Chang-Sub;Lee, Jong-Beom;Lee, Jae-Bong
    • Proceedings of the KIEE Conference
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    • pp.276-278
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    • 2007
  • This paper describes the analysis to install an arrester for an underground distribution line effectively. Currently, the underground distribution cable is protected by the arrester connected with overhead distribution line. However, riser pole arrester can't protect all parts of cable like the end of the underground distribution cable. To solve this problem, we installed the arrester on each cable and have measured the overvoltage made by lightning surge in each situation. The location to get effective results has been decided from the measured voltage above.

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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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    • 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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Improvement of the Conductor Temperature Calculation Algorithm for Calculating the Allowable Current in the Underground Channel (지중관로에서의 실제 허용전류 산출을 위한 도체온도 계산 알고리즘 개선에 관한 연구)

  • Lee, Hyang-Beom;Lee, Byung-Chul;Kim, Jung-Hoon;Nam, Yong-Hyun;Kang, Ji-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.3
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    • pp.352-357
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    • 2018
  • In this paper, the improvement of the conductor temperature calculation algorithm is studied. The allowable current of the underground transmission line is determined by the conductor temperature limit. Usually to calculate the allowable current limit, the conductor temperature is assumed in the most worst environment condition. It is possible to increase the transmission capacity if the actual burial environment is considered. Therefore, in this paper an algorithm is proposed to calculate the conductor temperature by distinguishing two area of a underground transmission line condition - the manhole where the temperature sensor can be installed and the underground transmission line in which the temperature sensor can not be installed easily. When calculating the conductor temperature by the underground line in the pipeline, the existing standard describes each environment as a single soil heat resistance and one ambient temperature. In order to compensate this situation, thermal resistance model that can take into consideration the ground surface temperature and under ground temperature is proposed. It is shown that the accuracy of the proposed model is increased compared with the existing standard calculation result.

A Study on the Surge Analysis considering Surge Arrester and Grounding System in the Combined Distribution System (혼합 배전계통에서 피뢰기적용과 접지시스템 변경을 고려한 서지 해석에 관한 연구)

  • Yun, Chang-Sub;Lee, Jong-Beom;Kim, Beong-Suk
    • Proceedings of the KIEE Conference
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    • pp.204-205
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    • 2006
  • This paper describes the protective ability of lightning arrestor in combined distribution system with power cable. To evaluate the protective ability, change of arrestor and grounding location are considered. On the other hand, arrestor developed by Cooper Power Systems for underground power cable system, is considered to evaluate surge protective ability as in underground system, when arrestor occurs failure has overhead line. The result shows that lightning arrestor in combined distribution system with power cable protect effectively when failure at arrestor in overhead line. On the other hand, arrestor developed by Cooper Power Systems for underground power cable system, is considered to evaluate surge protective ability in underground distribution system, when arrestor of overhead line has failure. The result shows that lightning arrestor installed in underground cable can effectively protected cables from surge when arrestor of overhead line has failure. And also even though grounding locations are decreased, it is revealed that protective ability is nearly similar.

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A Lightning Surge Analysis of Testing Line for Protection of Underground Distribution Systems (지중배전계통 보호를 위한 모의시험선로 서지특성 해석)

  • Kim Byoung-Sung;Lee Jang-Geun;Lee Jong-Beom;Han Byong-Sook
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.8
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    • pp.313-321
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    • 2006
  • This paper describes the overvoltage obtained by surge behavior analysis in testing underground distribution systems. Model systems consist of overhead distribution line and underground cable. Such model system considered various characteristics of actual distribution systems will be soon constructed at testing yard. Simulation is carried out under various states such as cable kinds, cable length, lightning wave and time, and branch circuits. Model is established by EMTP/ATPDraw. Line Constants are calculated by ATP_LCC. When the direct lightning surge strikes on conductor of overhead line, the overvoltage is calculated using EMTP/ATPDraw in many cases. Simulation results will be compared with real testing results at testing yard in the near future. The compared results will be used to establish protection methods in actual underground distribution systems.

Analysis of Sheath Induction Voltage for 154kV OF Underground Cable (154kV OF 지중케이블의 씨스 유도전압 해석)

  • Lee, H.G.;Kim, D.K.;Bae, J.H.;Ha, T.H.;Choi, S.B.;Jeong, S.H.
    • Proceedings of the KIEE Conference
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    • pp.156-158
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    • 2000
  • As we are industrialized lately, power capacity is increased in the city urban areas. So the application of underground transmission line is largely expended. In this paper, we analysis the induction voltage on the sheath of 1,200[$mm^2$] OF underground cable being used 154kV underground transmission line. If the current on the cable conductor is 300[A], circulation current is induced the maximum 100[A] on the cable sheath.

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The measurement of the half period modulated pulse on earth for detection of a underground electric leakage point (지중선로 누전점 탐지를 위한 반주기 변조된 대지 펄스 측정)

  • Kim, Jae-Hyun;Jeon, Jeong-Chay;Yoo, Jae-Geun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.11
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    • pp.5123-5127
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    • 2011
  • Research and development for the technology, that is about maintenance and accidents prevention of underground power distribution line, are demanding. The precise detection of leakage point of underground power line is very important, because it is difficult to detect the exact location of a fault in underground power line and to repair faults. When earth electric potential is measured to detect underground electric leakage point after transmitting AC electric pulse wave to underground power line, it must be measured in a specific half period of AC pulse wave because the distribution of the electric earth potential varies with the polarity of the transmitted wave. In this paper we proposed the measurement of half period modulated earth potential as a method to detect a underground leakage point. And We compared the proposed method with other methods. Through experiments we verified that the proposed method can be implemented and operated properly.

An Improvement of Optical Fiber Composite Power Cable On-Line Monitoring System for Underground Distribution Network (지중 배전계통 적용을 위한 광복합 케이블 실시간 감시시스템 개선)

  • Cho, Jin-Tae;Kim, Ju-Yong;Lee, Hak-Ju;Park, Jung-Sung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.7
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    • pp.77-83
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    • 2012
  • Since power system is switching to smart grid, on-line monitoring technology has become necessary for underground distribution power cable. Therefore, the application of DTS(Distributed Temperature Sensing) technology using OFCPC(Optical Fiber Composite Power Cable) capable of monitoring underground distribution power cables has been developed. These can bring about reductions in faults and increases in operating capacity of underground distribution system. To date, the test-bed of optical fiber composite power cable on-line monitoring system has been constructed. Then, matters to be improved have been drawn through verification experiments. This paper presents the improvement and experiment results of the optical fiber composite power cable on-line monitoring system to apply to underground distribution lines in the field.