The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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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 (Electrical Safety Research Institute, Korea Electrical Safety Corporation) ;
  • Kim, Taek-Hee (Electrical Safety Research Institute, Korea Electrical Safety Corporation) ;
  • Kim, Chong-Min (Electrical Safety Research Institute, Korea Electrical Safety Corporation) ;
  • Shong, Kil-Mok (Electrical Safety Research Institute, Korea Electrical Safety Corporation)
  • Received : 2016.08.19
  • Accepted : 2016.09.06
  • Published : 2016.10.01
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Abstract

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".

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References

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