• Title, Summary, Keyword: URD power cable

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Water Ingress of URD Power Cables with the Jacketing Materials and the Cable Structures (지중 케이블의 외피 재질 및 구조에 따른 수분침투 특성)

  • 한재홍;김동명;이재봉
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.244-247
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    • 2002
  • In order to evaluate the water ingress to URD power cables with the jacketing materials and the cable structures, water vapor transmission (WVT) tests were carried out by the ASTM and the TEPCO's specification. All polyolefin compounds showed the superior water suppression to conventional PVC. Especially, linear polyethylenes have very low WVT. In case of cable structures, Allaminate cables showed the significant water suppression due to the watertight structure. Accordingly, it can be concluded that jacketing material and cable structure play an important role in the water suppression of URD power cables.

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Effects of Hot Water on the Aging of URD Power Cables (지중 배편케이블의 열화에 미치는 온수의 영향)

  • 한재홍;송일근;김주용;이병성;정종욱
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.7
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    • pp.609-614
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    • 2002
  • In this study, we investigated the effects of hot water on the aging of URD power cables due to the hot water ingress to power distribution lines. Hot water contacted and non-contacted cables extracted from 2 distribution lines were characterized by the measurement of oxidation induction time(OIT) and chemical structure. In OIT measurement, hot water contacted cables showed the shorter OIT than non-contacted ones. Especially, hot water contacted insulation layer near insulation shield showed the shortest OIT. In chemical structure analysis, the antioxidant content was decreased and the acid concentration was increased by hot water ingress. From this results, it can be concluded that the hot water ingress to power cable may be accelerate the aging by means of antioxidant consumption.

Development of Jacket Compounds for URD Power Cables (지중 케이블용 외피 컴파운드 개발)

  • Han, Jae-Hong;Kim, Ju-Yong;Kim, Dong-Myung;Song, Il-Keun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.7-10
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    • 2002
  • In this study, polyolefin compounds were developed and evaluated for replacing a jacket material of URD power cables. The characteristics of compounds were investigated by water vapor transmission (WVT) test and mechanical test. In WVT test, all polyolefin compounds showed the superior water resistance to conventional PVC. The molecular structure and density of polyolefin play an important role in WVT. Also, polyolefin compounds showed the suitable characteristics in mechanical test. Especially, polyolefin compounds having linear molecules showed the superior characteristics to LDPE ones. From this study, it can be considered that polyolefin compounds may be suitable to jacket material for URD power cables.

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Chararcteristics of Water Vapor Transmission in Base Resin for Underground Residential Distribution Power Cable (지중배전케이블 기저수지의 수증기 투과 전달특성)

  • Song, Jae-Joo;Han, Byung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.149-153
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    • 2003
  • In URD(Underground Residential Distribution) power cable, experiments of WVT(Water Vapor Transmission) test on the Base Resin accomplished to specimens which contained CB(Carbon Black), anti-oxidant to base resin and made by pressing to resin of pellet or lump form. a kind of specimens was HDPE(High Density Polyethylene), MDPE(Medium Density Polyethylene), LDPE(Low Density Polyethylene), LLDPE(Linear Low Density Polyethylene), PVC(Polyvinyl Chloride). as a results of WVT test, we saw that WVT ratio was HDPE < LLDPE < MDPE≒LDPE${\ll}$ PVC. WVT properties of PVC using for jacket showed properties 15-20 times more than MDPE or LLDPE. Therefore, to development of watertightness cable, our works present need of Changing in insulating materials.

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Evaluation of Jacket Compounds for Underground Distribution Power Cables (지중 배전케이블용 자켓 컴파운드의 특성평가)

  • 한재홍;송일근;김동명;이재봉;정창수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.8
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    • pp.687-694
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    • 2002
  • In order to replace the jacket material for URD power cables, the 6 kinds of polyethylene compounds were manufactured and evaluated. The characteristics of the compounds were investigated by water vapor transmission (WVT) test, thermal and mechanical test. In WVT test, all the polyethylene compounds showed the superior water resistance to conventional PVC. The molecular structure and density of polyethylene play an important role in WVT. Also, the polyethylene compounds showed the suitable characteristics in thermal and mechanical test. Especially, the linear polyethylene compounds showed the superior characteristics to LDPE ones. Due to the fillers in compounds, the abrasion resistance was decreased and the cut-through resistance was increased. From this study, it can be considered that the polyethylene compounds may be suitable to jacket material for URD power cables.

Field Application of Power Cable Diagnosis System (전력케이블 열화진단기법의 현장적용)

  • Kim, Ju-Yong;Han, Jae-Hong;Song, Il-Keun;Kim, Sang-Jun;Lee, Jae-Bong;Oh, Jae-Hyung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.148-151
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    • 2002
  • In order to prevent the failures of underground distribution power cables we need to measure insulation condition in the field. Until now we used DC high voltage as a power source for the cable diagnosis but it was not proper method to the XLPE insulation cables because DC high voltage can affect sound insulation and can't diagnose exactly insulation degradation. For these reasons we imported isothermal relaxation current measurement system called by KDA-1 from germany but it's reliability did not proved in our URD cables. DC voltage decay measurement system was developed by domestic company but they don't have field experience. In this paper we tried to prove reliability of these two systems in the field. Through the field diagnosis and Ac breakdown test the two systems showed similar results.

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Development of Waterproof Jacket Materials for Power Cables

  • Han, Yong-Huei;Jung, Jong-Wook;Kwon, Tae-Ho;Song, Hyun-Seok;Koo, Kyo-Sun;Han, Byung-Sung
    • KIEE International Transactions on Electrophysics and Applications
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    • v.3C no.4
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    • pp.146-154
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    • 2003
  • This paper describes various characteristics of the new compounds for cable jackets and model cables advanced in waterproof performance in order to essentially solve the problems of underground (URD) distribution class power cable failures. Several compounds were manufactured by the inclusion of additives to base resins available in Korea and tested for basic property, mechanical and electrical characteristics. Two model cables were created by using the compounds determined in the test as being the most appropriate for new structured model cable jacket material. The waterproof performance and mechanical strength of the new cable jackets were verified by applicable tests. As a result, MDPE and LLDPE compounds were superior as cable jackets in both mechanical and electrical characteristic aspects when compared with conventional PVC. In addition, the model cables composed of the new compounds based on MDPE showed good quality results in the water permeability test.

The Consideration of Electrical Characteristics and Breakdown Lifetime in 22.9[kV] Underground Distribution Power Cables (22.9[kV] 지중배전용 전력케이블의 전기적 특성과 파괴수명 고찰)

  • Kim, Chung-Bae;Hong, Gyeong-Jin;Im, Jang-Seop;Jeong, U-Seong;Kim, Sang-Jun;Kim, Tae-Seong
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.9
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    • pp.628-633
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    • 1999
  • 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. Tan$\delta$ had commonly a different tendency by means oftemperature and frequency and also appeared higher at the outer part rather than innerpart of insulator. PD-q increased generally in proportion to the applied voltage andshowed regular patterns in relation to the thickness of insulator. Breakdown voltageswere measured and breakdown lifetimes were predicted appling for Weibull distribution function. As a result, breakdown lifetime in failure cables was shorter up to$\fraction one-third$ times than that in general cables. It was very available to estimate cable degradation using above method, but it needs further study on XLPE insulated URD cables in order to improve reliability.

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Characterization of Water Vapor Transmission & Dielectric Breakdown in Insulation Materials for Jacket Compound (자켓 컴파운드용 절연재의 수증기투과 및 절연파괴 특성)

  • Song, Jae-Joo;Han, Jae-Hong;Song, IL-Keun;Han, Yong-Hee;Han, Byung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.52-56
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    • 2001
  • Experiments of 2 type on insulating compounds accomplished to change PVC using in URD(Underground) power cable jacketing. one was DB (Dielectric Breakdown) test on the pure base resins and the others were WVT(Water Vapor Transmission) test on the compounds which contained C/B(Carbon Black), anti-oxidant to base resin. a kind of specimens made by pressing to resin of pellet or lump form was HDPE(High Density Polyethylene), MDPE(Medium Density Polyehylene), LDPE(Low Density Polyethylene), LLDPE(Linear Low Density Polyethylene), PVC (Polyvinyl Chloride). As a results of AC DB and WVT test, we saw that strength of Insulation was HDPE > LLDPE ≒ MDPE > LDPE and WVT ratio was HDPE < LLDPE < MDPE < LLDPE ≒ LDPE${\ll}$PVC. WVT of PVC using for jacket showed characteristic 15 times more than MDPE or LLDPE. Therefore, to development of watertightness cable, our works present need of Changing in insulating materials

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Characterization of Water Vapor Transmission & Dielectric Breakdown in Insulation Materials for Jacket Compound (자켓 컴팍운드용 절연재의 수증기투과 및 절연파괴 특성)

  • 송재주;한재홍;송일근;한용희;한병성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.52-56
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    • 2001
  • Experiments of 2 type on insulating compounds accomplished to change PVC using in URD(Underground) power cable jacketing. one was DB(Dielectric Breakdown) test on the pure base resins and the others were WVT(Water Vapor Transmission) test on the compounds which contained C/B(Carbon Black), anti-oxidant to base resin. a kind of specimens made by pressing to resin of pellet or lump form was HDPE(High Density Polyethylene), MDPE(Medium Density Polyehylene), LDPE(Low Density Polyethylene), LLDPE(Linear Low Density Polyethylene), PVC(Polyvinyl Chloride). As a results of AC DB and WVT test, we saw that strength of Insulation was HDPE> LLDPE = MDP E> LDPE and WVT ratio was HDPE

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