• Title/Summary/Keyword: Cable diagnosis

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Diagnosis of power cable system based on the HFPD detection at on-site (HFPD 검출법을 이용한 지중 케이블 실선로 진단)

  • Lee, J.S.;Kim, C.S.;Lee, D.G.;Kong, C.H.;Seok, K.H.;Lee, K.W.
    • Proceedings of the KIEE Conference
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    • 2004.05b
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    • pp.97-100
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    • 2004
  • HFPD(High Frequency Partial Discharge) measurement has been widely performed to diagnosis of cable system in the world although Korea just begin. The efficiency of measurement has been reported and proved by many researchers who are engaged in the diagnosis of high power apparatus. LG Cable has investigated the technology of diagnosis for cable system by means of PD measurement for 10 years. In this paper, PD measurement with portable device was performed to evaluate the quality of the 154kV transmission line and the 22.9kV XLPE cable line. Test results are shown that the HFPD detection technology is very attractive for the diagnosis of power cable system by high detection sensitivity at on-site.

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A Study on the Results of the diagnosis of Insulation Deterioration in Live-Line Distribution Power Cables at the Field (배전용 CV케이블의 현장 열화진단 결과의 고찰)

  • Yoo, Soung-Jong;Jeon, Seung-Ik;Jung, Suk-Youn
    • Proceedings of the KIEE Conference
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    • 1996.07c
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    • pp.1831-1834
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    • 1996
  • Diagnosis of cable insulation degradation has important meaning from a viewpoint of reliability enhancement of CV cable systems. So, we diagnosed 3.3kV & 6.6kV CV distribution cable on live-line which is judged to a most poor installation condition because they have been used in water condition after installation at the Yeochon chemical complex. The paper describes the analysis of the measured data, the problems at diagnosis, and the items which are considered at the development of diagnosis technology and equipment hearafter.

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APPLICATION OF DIRECT LEAKAGE CURRENT METHOD FOR AGING DIAGNOSIS EVALUATION (열화 진단 평가를 위한 직류 누설법의 활용)

  • Lee, Kwan-Woo;Park, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11b
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    • pp.149-152
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    • 2001
  • In this paper, aging diagnosis method of CV cable was investigated. CV cable was designed for the sake of using during 30 years. Therefore it was important to evaluate the cable's remaining life because CV cable used for power transmission line since 1970's. CV cable was mainly installed at the underground owing to the environmental condition. If the cable accident occurred, it needs the much time for the accident recovery and the much damage at the industrial activity. therefore, this paper should study the direct leakage current method, a sort of the cables' aging test method

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APPLICATION OF DIRECT LEAKAGE CURRENT METHOD FOR AGING DIAGNOSIS EVALUAT10N (열화 진단 평가를 위한 직류 누설법의 활용)

  • 이관우;박대희
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.149-152
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    • 2001
  • In this paper, aging diagnosis method of CV cable was investigated. CV cable was designed for the sake of using during 30 years. Therefore it was important to evaluate the cable's remaining life because CV cable used for power transmission line since 1970's. CV cable was mainly installed at the underground owing to the environmental condition. If the cable accident occurred, it needs the much time for the accident recovery and the much damage at the industrial activity. therefore, this paper should study the direct leakage current method, a sort of the cables'aging test method.

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Power Cable Insulation Diagnosis Using Low Frequency Power (저주파수 전원을 이용한 전력케이블 절연평가에 관한 연구)

  • Kim, Sung-Min;Lee, Sang-Hun;Jang, Jae-Yel
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1603-1603
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    • 2011
  • As time goes by these cables make a insulation problems, and ask for a preventive diagnosis method. Cable has very high electrostatic capacity and insulation defects mainly caused by water-tree(WT). Dissipation factor test is very useful for detecting WT but it needs huge power supply. In this paper we presented a cable insulation diagnosis by dissipation factor using low frequency power supply.

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The Study of Accident Cases Verification and Construction of It's Cause Diagnosis System of Power Cable Accident (케이블 사고 자가원인 진단시스템 구축 및 사고사례 검증에 관한 연구)

  • Kim, Young-Seok;Shong, Kil-Mok;Kim, Sun-Gu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.9
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    • pp.91-97
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    • 2009
  • We have constructed the it's cause diagnosis system of power cable by Failure Mode Effect Analysis(FMEA) method because we have to cause analysis when the cable accident happened. This system was composed of data input of accident condition, presentation of the shape through pictograph and accident probability by FMEA method. According to each selection, the accident cause comments are showed by the accident occurrence possibility. Also, the verification of the it's diagnosis system through the cause analysis of the cable accident cases, the system agreed well with results that analyzed actual state.

Analysis of Diagnosis and Very Low Frequency Experiment to Detect of Fault on 22.9kV Class Cable (22.9kV급 케이블 결함 검출을 위한 초저주파 실험 및 현장 진단 분석)

  • Kim, Young-Seok;Kim, Taek-Hee;Kim, Chong-Min;Shong, Kil-Mok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.10
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    • pp.1780-1785
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    • 2016
  • This paper presents few case studies of state diagnosis of XLPE cables using very low frequency techniques. The power cables of 22.9kV which have installation fault were assessed using VLF technique in addition to other techniques like insulation resistance and DC voltage withstand test. From the experimental results, The dielectric loss($tan{\delta}$) values of degradation of the cable(joint, knife, needle) at $U_0$ were 5.839, 5.526 and 6.251, respectively and all values were "further study advised". VLF PD measurement was also found defective portion. These method was effective in defect to fault in the degradation of the cable. However, the breakdown did not occur in the degradation of the cable because of properties of XLPE insulation. Few case studies of using VLF $tan{\delta}$ diagnosis for fault are measured and analyzed. The $tan{\delta}$ values at $U_0$ were "further study advised" or "action required".

Behavior of Residual Charges in Water-tree Degraded XLPE Sheets and Cable

  • Ebinuma, Yasumitsu;Masui, Noriaki
    • Transactions on Electrical and Electronic Materials
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    • v.7 no.5
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    • pp.224-229
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    • 2006
  • Many studies have been done on the application of residual charge measurement in cable degradation diagnosis. In this paper, the behavior of residual charges measured with water-tree degraded XLPE sheets and cable are discussed. At charge injection process, the charge is injected by applying dc voltage as a conventional method, suddenly cut-off ac voltage or impulse voltage. Therefore the residual charge is influenced by the applying process. At charge release process, transient dc current flows when applying ac high voltage and also ac high voltage superimposed to dc low voltage. From the results, new diagnosis method is suggested.

Normalization Diagnosis of Aging Process on Partial Discharge Signals of CV Cable (CV케이블의 부분방전 신호를 통한 열화과정의 정량적 진단)

  • 소순열;임장섭;김진사;이준웅;김태성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.451-455
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    • 1997
  • The partial discharge has been blown as the chief breakdown of power equipments. The analysis and the recognition is much difficult because the partial discharge signal is very small and has complex aging pattern. Recently, insulation aging diagnosis based on pattern of phase(Ф), partial discharge magnitude(q), number(n) has been very important. Owing to depreciate the reappearance of aging progress at the electrical tree pattern and to be difficult to analyze visually, the study on partial discharge pattern is suggested to normalizing analysis method of partial discharge signals. This parer is purposed on prediction of life-time measurement of cv-cable, on decision of risk degree with normalization and real-time measurement of partial discharge signals for aging diagnosis of cv-cable. As normalizing the aging signals of electrical tree in cv-cable, it is able to confirm risk degree of insulation material with the distribution of Ф-q-n and recognize the process of aging pattern using neural network.

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