Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Implementation of Power Cable Diagnostic Simulator using VLF

VLF를 활용한 전력케이블 진단 시뮬레이터 구현

  • Kim, Kuk (Korea Electrical Safety Corporation) ;
  • Eo, Ik-soo (Dept. of Electrical Engineering, Honam University)
  • 김국 (한국전기안전공사) ;
  • 어익수 (호남대학교 전기공학과)
  • Received : 2020.06.29
  • Accepted : 2020.08.07
  • Published : 2020.08.31
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Abstract

Power cables installed in domestic factories or underground can cause accidents depending on the manufacturing process, installation, and environmental conditions during use. When an accident occurs in a power cable, it can cause enormous economic loss and social confusion. Hence, the importance of preventive management of the cable through diagnosis is increasing to prevent it. Therefore, in this paper, a diagnostic sample cable was produced by simulating a part that could be a problem due to the installation, manufacturing defects, or deterioration of cables that can occur in the field. Dielectric loss Tangent (tan 𝛿; TD), and Partial Discharge(PD) tests were performed. Partial discharge and AC (60Hz) withstand voltage equipment using High-Frequency Current Transformer (HFCT) were applied After applying a VLF (Very Low Frequency) power supply with a frequency of 0.1Hz was applied. As a result, B and C phase defect samples at a 2.0U0 voltage through the VLF could measure the internal partial discharge in the A-phase normal sample cable from the noise at a 0.5U0 to 2.0U0 voltage. In addition, the 1.5U0 voltage was measured through the AC (60Hz) withstand voltage equipment of the commercial frequency to verify its effectiveness. Partial discharge in the run-off state was measured at a voltage of 1.0U0, and there was a risk when installing the equipment. AC power equipment showed a difficulty of movement by volume or weight. The diagnostic method, through the VLF of the quadrant state, revealed its safety and effectiveness.

국내 공장이나 지중에 설치되어 있는 전력 케이블은 제조과정, 설치, 사용 중의 환경여건에 따라 사고가 발생할 수 있는 필연성을 갖고 있다. 전력 케이블에서 사고가 일어났을 때 막대한 경제적 손실과 사회적 혼란을 야기할 수 있어 이를 미연에 방지하고자 진단을 통한 케이블의 예방관리의 중요성이 증대되고 있다. 이에 본 논문에서는 현장에서 발생 될 수 있는 케이블의 설치나 제조결함, 경년열화로 문제가 될 수 있는 부분을 모의하여 진단시료 케이블을 제작하였고, 최근 도입되어 적용되고 있는 VLF(Very Low Frequency)장비를 사용하여 유전정접(tan 𝛿 ; TD), 부분방전(Partial Discharge ; PD)시험을 실시하였고, 0.1Hz 주파수를 갖는 VLF전원을 가압을 한 후 HFCT(High Frequency Current Transformer)를 이용한 부분방전과 AC(상용주파)내압 장비를 이용하여 가압한 후 PD측정을 수행하였다. 그 결과, VLF를 통한 2.0U0 전압에서 B, C상 결함시료에서는 내부 부분방전을 측정할 수 있었으며 A상 정상시료에서는 0.5~2.0U0 전압에서 모두 노이즈로 측정되었다. 또한, 상용주파수의 AC(60Hz) 내압장비를 통한 1.5U0전압에서 측정하여 그 실효성을 검증하였다. 활선상태에서의 부분방전은 1.0U0의 사용전압에서 측정 되어지며, 장비를 설치할 때 위험성이 있고, AC내압장비는 부피나 무게 등에 의해 이동의 어려움이 있어 사선상태의 VLF를 통한 진단방법이 안전과 실효성이 있음을 알 수 있었다.

Keywords

References

  1. Introduction to underground cable deterioration and diagnosis, Korea Electric Power Corporation distribution center, Oct. 2010.
  2. Carlos Ferrer, Joseba Koldo Gamez, Antoni Villalonga, "Improving Cable System Reliability with Monitored Withstand Diagnostics - Featuring High Efficiency at Reduced Test Time", 9th International Confernce on Insulated Power Cables , Jicable, 2015. https://www.jicable.org/TOUT_JICABLE/2015/2015-C2-3
  3. Minghui Bao, Shiying Tang, JunjiaHe, Xiaogen Yin, Qian Wang, GaolinWu, YanYang, "The Initiation Phenomena of Electrical Treeing in XLPE Cable Insulation", International Confernce on High Voltage Engineering and Application, pp.431-434, 2012. DOI: https://doi.org/10.1109/ICHVE.2012.6357142
  4. G.Toman, Medium Voltage Cable Aging Management Guide, EPRI Report 1016689, Appendix C-2, 2008.
  5. Jae-Bong Lee, Jong-Man Jeong, Chul-Bae Park, Jae-Wook Lee, Young-Soo Mok, "Results of Field Tree Deterioration Diagnosis Technology Field Test Results for Domestic Underground Distribution Cables," Proceedings of the 37th Summer Conference of the Korean Institute of Electrical Engineers A , pp. 506-507, July 2006.
  6. Hernandez-Mejia, J. Perkel, J. Harley, R. Hampton, "Correlation between $Tan{\delta}$ Diagnostic Measurments and Breakdown performance at VLF for MV XLPE Cables", IEEE Transactions on Dielectrics and Electrical Insulation, Vol.16, pp.162-170, 2009. DOI: https://doi.org/10.1109/TDEI.2009.4784564
  7. Weiwei Li, Jianying Li, Guilai Yin, Shengtao Li, Jiankang Zhao, Benhong Ouyang, Yoshimichi Ohki, "Frequency dependence of breakdown performance of XLPE with different artificial defects", IEEE Transactions on Dielectrics and Electrical Insulation, Vol.19, No.4, pp.1351-1359, 2012. DOI: https://doi.org/10.1109/TDEI.2012.6260011
  8. S. M. Kim, "The Influence Estimation of Aging Factor in MV Cable Using Weibull Distribution and Neural Networks", IEEE Condition Monitoring and Diagnosis, 2012. DOI: https://doi.org/10.1109/CMD.2012.6416382
  9. Jung Woo-Sung, A Study on VLF $tan{\delta}$ Status Criteria for Power Cables , Ph.D dissertation, Mokpo National University Graduate School, pp.32-33, 2020.
  10. "IEEE Draft Guide for Field Testing of Shielded Power Cable Systems Using Very Low Frequency (VLF) (less than 1 Hz)," in IEEE P400.2/D13 August 2012, pp.1-56, 7 Oct. 2012.
  11. "IEEE Guide for Field Testing and Evaluation of the Insulation of Shielded Power Cable Systems Rated 5 kV and Above," in IEEE Std 400-2012 (Revision of IEEE Std 400-2001), pp.1-54, 5 June 2012. DOI: https://doi.org/10.1109/IEEESTD.2012.6213052