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와이불 수명지수에 의한 고전압 케이블의 전압열화 측정값의 선형성 확인

Linearity Verification of Measured Voltage Deterioration of High Voltage Cable based on Weibull Lifetime Index

  • 투고 : 2016.01.06
  • 심사 : 2016.02.05
  • 발행 : 2016.02.29

초록

전력 수요량은 매년 증가추세에 있으며, 발전소에서 동작하는 모든 장비들과 대용량의 장거리 전력수송을 위한 장비들은 전력 소비자들이 기대하는 바 신뢰할 수 있는 수준에서 완전한 상태로 동작하여야 한다. 일반적으로, 고전력 송전을 위하여 사용되고 있는 케이블은 동작수명이 30년 이라고 제작 시에 선언된다. 케이블은 동작을 시작함과 동시에 성능이 악화되는 열화과정(케이블의 전기적 특성이 악화되는)이 시작된다. 열화로 인한 신뢰성의 손상이 발생함에도 불구하고, 동작상태의 신뢰성을 진단을 받지 않았기 때문에, 언제 불의의 사고를 초래할지 예측을 할 수 없을 만큼 위험한 상태에서 동작을 하고 있는 실정이다. 우리는 케이블의 열화과정을 진단하기 위하여 진단 장비를 제작하였고, 충청남도 태안의 (주)서부발전에 설치하여 시운전 하고 있는 중이다. 우리는 측정장비를 이용하여 추출한 데이터를 얻은 결과를 시간에 따라 변동 하는 그래프로 표시하여 분석한 특성을 이전 논문들에서 제시하였다. 이 논문에서는 이전 논문에서의 측정값으로 나타낸 그래프가 Weibull 확률분포에 의한 열화 이론과 일치하는 지를 확인하고, 결과를 제시한다.

As the demand for electric power increases, all devices operating in power stations and all devices adopted in order to deliver distant loads need to be operating in perfect condition at the level of reliability expected by consumers. In general, the lifetime of cables used in delivering high power is declared to be 30 years from the time of production. Deterioration (which is the worsening of electric properties) starts from the very moment of operation. In spite of the reduction in reliability caused by deterioration, the reality is that cables often operate at considerable risk of accidents because the reliability of operation has not been diagnosed. We have invented a device to diagnose the deterioration processes of high-voltage power cables. It has been installed and is currently operating at Korea Western Power Co., Ltd., located in Chungnam, Korea. In previously published papers we have shown graphs obtained by plotting insulation resistances versus time, through analyzing the data extracted from operating cables using the devices we have invented. In this paper, we verify that the previously plotted graphs agree with the life time index of Weibull distribution of probability.

키워드

참고문헌

  1. J. S. Kim, K. H. Kim, J. S. Lee, "The Study on the Variable Orifice Spray of the Steam Power Plant Desuperheater," Journal of the Korea Academia- Industrial Cooperation Society(JKAIS), Vol. 14, No. 1, pp. 63-68, 2013. https://doi.org/10.5762/KAIS.2013.14.1.63
  2. K. Mori, Y. Inoue, T. Yoshimitsu, Y. Ishikawa, H. Yoshida, T. Sueki, F. Aida, "Voltage deterioration of XLPE wires in water under gamma ray irradiation," IEEE Transactions on Energy Conversion, Vol. 4, Issue 3, pp. 466-472, Sep., 1989. https://doi.org/10.1109/60.43250
  3. K. H. Um, K. W. Lee, "Developing Equipment to Detect the Deterioration Status of 6.6 kV Power Cables in Operation at Power Station," The Journal of the Institute of Internet, Broadcasting and Communication(JIIBC), Vol. 14, No. 4, pp. 197-203, Aug., 2014. https://doi.org/10.7236/JIIBC.2014.14.4.197
  4. Electrical Power Engineering, Power Lab II, Experiment: Partial discharges, University of Technical Darmstadtm High Voltage Department, Summer Semester 2011.
  5. G. Paoletti, A. Golubev, "Partial Discharge Theory and Applications to Electrical Systems", Pulp and Paper, 1999. Industry Technical Conference Record of 1999 Annual IEEE, 21-25 June 1999, pp. 124-138, Seattle, WA, USA /10.1109/PAPCON.1999.779355
  6. M. N. Sharifa, M. N. Islamb, "The Weibull distribution as a general model for forecasting technological change," Technological Forecasting and Social Change, Vol. 18, Issue 3, pp. 247-256, Nov. 1980. https://doi.org/10.1016/0040-1625(80)90026-8
  7. http://www.weibull.com/hotwire/issue14/relbasics14.
  8. K. H. Um, K. W. Lee, "Developing Equipment to Detect the Deterioration Status of 6.6kV Power Cables in Operation at Power Station", Journal of the The Institute of Internet, Broadcasting and Communication, Vol. 14, No. 4, pp. 197-203, Jun 2013. https://doi.org/10.7236/JIIBC.2014.14.4.197
  9. http://www.netaworld.org/standards/ansi-neta-ats
  10. J. Bird, Electrical Circuit Theory and Technology, Routledge, p. 549, 5ed., 2013.
  11. K. W. Lee, Y. H. Whang, Y. C. Weon, K H. Um, J. H Lee, D. H. Park, "Developing a Diagnosis Equipment to Determine the Relationship between Load Current and Lifetime of 6.6kV Cables in Operation," The Korean Institute of Electrical Engineers(KIEE), Fall Conference, 2013.
  12. K. H. Um, K. W. Lee, "A Linear Change of Leakage Current and Insulation Resistance of 22 kV Cables", Journal of the The Institute of Internet, Broadcasting and Communication, Vol.14, No. 4, pp. 169-173, Jun 30, 2015.
  13. Papoulis, Athanasios Papoulis; Pillai, S. Unnikrishna Probability, Random Variables, and Stochastic Processes (4th ed.). Boston: McGraw-Hill. ISBN 0-07-366011-6. 2002.
  14. http://www.statsoft.com/Textbook/Survival-Failure-Time-Analysis