• Title/Summary/Keyword: Underground power cables

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Development of the Permissible Current-Carrying Capability Calculation Program of Transmission Power Cables Installed in Ducts (관로 부설 송전 케이블의 허용전류 계산 프로그램 개발)

  • Jeong, S.H.;Kim, D.K.;Choi, S.B.;Lee, D.I.;Kang, J.W.;Gwak, B.M.;Tack, E.G.;Yoon, H.H.;Kim, J.S.;Park, J.H.;Kim, H.S.
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.340-342
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    • 2001
  • This paper introduces the program of calculating the permissible current-carrying capability of underground power cables. Its program is developed the KEPCO's standard based on IEC 287.

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Dielectric Characteristics of HTS Cable (고온초전도 케이블의 유전 특성)

  • Kwag, Dong-Soon;Kim, Hae-Jong;Cho, Jeon-Wook;Seong, Ki-Chul;Kim, Sang-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.08a
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    • pp.64-68
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    • 2002
  • According to the increasing power demand for the future construction of many underground cables will be required. However, construction of new ducts for power cables will be more difficult. Therefore, research work for realizing the high temperature superconducting(HTS) cable has advanced, where the development of electrical insulating system at cryogenic temperature is one of the major researches. For an electrical insulation design of HTS cable, it is important to understand not only breakdown but also partial discharge and dielectric loss($tan{\delta}$) in liquid nitrogen/paper composite insulation system. In this paper, we investigated breakdown characteristics in liquid nitrogen/paper composite insulation system for the application to HTS cable. And, we studied the breakdown characteristics of the multi-layer and butt gap of the insulation papers in liquid nitrogen. Also, we measured dielectric loss($tan{\delta}$) of the mini-model Cable made of TERLAM IPP.

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Design of Submarine Cable for Capacity Extension of Power Line (전력선 용량증대를 위한 해저케이블 설계)

  • Son, Hong-Chul;Moon, Chae-Joo;Kim, Dong-Sub
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.1
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    • pp.77-84
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    • 2022
  • A submarine power cable is a transmission cable for carrying electric power below the surface of the water. Recently, submarine cables transfer power from offshore renewable energy schemes to shore, e.g. wind, wave and tidal systems, and these cables are either buried in the seabed or lie on the ocean floor, depending on their location. Since these power cables are used in the extreme environments, they are made to withstand in harsh conditions and temperatures, and strong currents. However, undersea conditions are severe enough to cause all sorts of damage to offshore cables, these conditions result in cable faults that disrupt power transmission. In this paper, we explore the design criteria for such cables and the procedures and challenges of installation, and cable transfer splicing system. The specification of submarine cable designed with 3 circuits of 154kV which is composed of the existing single circuit and new double circuits, and power capacity of 100MVA per cable line. The determination of new submarine cable burial depth and cable arrangement method with both existing and new cables are studied. We have calculated the permission values of cable power capacity for underground route, the values show the over 100MW per cable line.

Effect of compact HTS superconduction 7ower cable and evaluation of its economical efficiency (컴퍽트형 고온 초전도 전력 케이블의 기대 효과와 경제성 평가)

  • 최상봉;성기철;조건욱;정성환;김대경;김학만;전영환
    • Progress in Superconductivity and Cryogenics
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    • v.3 no.2
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    • pp.10-14
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    • 2001
  • This paper presents the possible application of a HTS superconducting power cable fro transmitting electric power in metropolitan areas, reflecting its important distinction such as compactness for installation in underground ducts and considerable efficiency improvement comparable to present underground cables. In this paper, we investigated characteristic and market scale compact HTS transmission cable which is possible to install in under-ground ducts. and reviewed its economical efficiency comparing to present existed CV cable construction and duct or tunnel installation.

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A Study on Energy Characteristics in Transient States of OF Cable Systems (OF 케이블 계통에서 과도상태시 에너지 특성 검토)

  • Jung, Chae-Kyun;Lee, Jong-Beom;Kang, Ji-Won;Lee, Dong-Il;Seo, Je-Ho
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.11
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    • pp.468-475
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    • 2006
  • This paper reviews the energy characteristics of oil filled cables in transient state such as grounding fault and lightning surge. Artificial grounding fault test was firstly performed in 2003 for the analysis of arc voltage and breakdown energy according to the fault current. In this paper, energy of OF cable is variously analysed at joint box based on the actual test. Then more various conditions such as installation types, section lengths and CCPU(Cable Covering Protection Unit) connection types are applied for the simulation using EMTP when the single line to ground fault and direct lightning stroke are occurred on actual underground power cable systems and combined power cable systems, respectively. Finally, the energy by the length of crossbonded lead and grounding lead as well as fault lasting time is also calculated using EMTP simulation.

Performance Evaluation of 154 kV Separable Dry Type Plug-in Connector (154 kV 건식형 지중종단접속함의 성능 평가)

  • Kim, Seok-Sou;Park, Young-Chang;Oh, Chang-Su
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.470-471
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    • 2007
  • Underground connectors in 154kV for the connection between power cables and power equipments represent a greater part of power system stability and reliability. This paper presents the performance evaluation of 154kV separable dry type plug-in connector of a company in Japan for transformers and Gas Insulated Switchgear. And the possibility of the application on domestic underground line was considered.

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Consideration on Electrical Characteristics and Breakdown Lifetimes in 22.9[KV] Underground Distribution Power Cables (22.9[KV] 지중배전용 전력케이블의 전기적 특성과 파괴수명 고찰)

  • Kim, Choong-Bae;Lee, Jung-Bin;Lim, Jang-Seob;Han, Jae-Hong;Kim, Chul-Woon;Kim, Tae-Sung
    • Proceedings of the KIEE Conference
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    • 1998.11c
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    • pp.916-918
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    • 1998
  • Degradation diagnosis of XLPE insulated URD cables was accomplished through out new method which was to be analyzed by non-electrical experiments and synthesized by degradation points. To supplement this method, It was also carried out using several electrical analyses PD-q increased generally in proportion to the applied voltage and showed no uniform patterns in relation to the thickness of insulator. Leakage current was unequal according to the thickness of insulator and its range was from 20[nA] to 50[nA]. $Tan{\delta}$ had commonly a different tendency by means of temperature and frequency and also appeared higher at the outer part rather than inner part of insulator. Breakdown voltages were measured and breakdown lifetimes were predicted appling for Weibull distribution function. As a result, breakdown lifetime in failure cables was longer up to three times as much as general cables.

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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.

Insulation Aging Characteristic Assessment on the Power cables with the Comparative Analysis Between Destructive and Nondestructive Diagnosis (파괴 및 비파괴진단 비교분석을 통한 케이블 열화특성평가)

  • Yi, Dong-Young
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.6
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    • pp.104-108
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    • 2009
  • The insulation aging characteristics and structural analysis test were performed to analyze the correlations among the insulation deterioration, diagnostic results and the breakdown strength for the underground power cables. From the results of the degree of crosslinking test, hot-oil test etc., it could be confirmed that there were no manufacturing defects in the power cables under test. From the results of the water tree test and chemical structural analysis, it could be confirmed that the aging status of cable under test were very poor, especially for B-Phase and the degree of aging was increased in the orders of A, C and B-phase. From the above results, it could be concluded that the insulation aging characteristic analysis results were well consistent with the diagnostic and breakdown test results, and also confirmed that the diagnostic system under consideration was successful to discriminate the bad cables which is likely to cause cable system failure.

Surveillance System For Extra High Voltage Cable (초고압 CABLE 감시시스템 연구)

  • Hahn, K.M.;Lee, K.C.;Jeon, S.I.;Kim, C.S.
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.789-793
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    • 1992
  • For improving the power supply reliability and minimizing maintenance work of E.H.V. underground transmission line, new surveillance systems are strongly desired for use in the field of electric power transmission. For underground installation, high system reliability is required because E.H.V. cables, if an accident happen, can have a serious impact on social activities and human life. In answer to this requirement, applications of optical fiber transmission system have been widely developed in a variety of field. The main function of this system are cable fault location, oil leak detection, and surveillance of the cable circuit and tunnel condition.

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