DOI QR코드

DOI QR Code

22.9kV급 케이블 결함 검출을 위한 초저주파 실험 및 현장 진단 분석

Analysis of Diagnosis and Very Low Frequency Experiment to Detect of Fault on 22.9kV Class Cable

  • 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)
  • 투고 : 2016.08.19
  • 심사 : 2016.09.06
  • 발행 : 2016.10.01

초록

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".

키워드

참고문헌

  1. Korea Electrical Safety Corporation, "A Statistical Analysis on the Electrical Accident", 23th edition, 2014.
  2. G.S. Eager et al, "HIGH VOLTAGE VLF TESTING OF POWER CABLES", IEEE Transaction on Power Delivery, Vol. 12, No. 2, pp. 565-570, 1997. https://doi.org/10.1109/61.584323
  3. Jae-Bong Lee et al, "The International Standard Trends of MV Power Cable Installation Test and its Application on Korean Standard", KIEE Summer conference, pp. 318-319, 2008.
  4. Tobias NEIER, "Combined Application of Diagnostics Tools for MV Underground cables", 9th International conference on Insulated Power Cables, C4.4, 2015.
  5. Burjupati Nageshwar RAO, Mallikarjunappa K, "Dielectric diagnosis of extruded cable insulation by very low frequency and spectroscopic techniques - A few case studies", 9th International Conference on Insulated Power Cables, C6.64, 2015.
  6. IEEE Std. 400.2-2013, IEEE Guide for Field Testing Shielded Power Cables Systems Using Very Low Frequency (VLF)
  7. IEC Std. 60502-2(2014), Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) - Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV), pp. 43-44, 2014.