Journal of Electrical Engineering and Technology

  • 제13권1호
  • /
  • Pages.372-378
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  • 2018
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  • 1975-0102(pISSN)
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  • 2093-7423(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
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DGA Gases related to the Aging of Power Transformers for Asset Management

  • Kweon, Dongjin (Transmission & Substation Laboratory, Korea Electric Power Corporation Research Institute) ;
  • Kim, Yonghyun (Transmission & Substation Laboratory, Korea Electric Power Corporation Research Institute) ;
  • Park, Taesik (Department of Electrical and Control Engineering, Mokpo National University) ;
  • Kwak, Nohong (Department of Electrical and Control Engineering, Mokpo National University) ;
  • Hur, Yongho (Gangwon Regional Headquarter, Korea Electric Power Corporation)
  • 투고 : 2017.06.15
  • 심사 : 2017.08.03
  • 발행 : 2018.01.01
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초록

Life management technology is required as the failure risk of aged power transformers increases. Asset management technology is developed to evaluate the remaining life, establish the replacement strategies, and decide the optimal investment based on the reliability and economy of power transformers. The remaining life assessment uses data such as installation, operation, maintenance, refurbishment, and failure of power transformers. The optimal investment also uses data such as maintenance, outage, and social costs. To develop the asset management system for power transformers, determining the degradation parameters related to the aging of power transformers and evaluating the condition of power transformers using these parameters are important. In this study, since 1983, 110,000 Dissolved Gas Analysis (DGA) data have been analyzed to determine the degradation parameters related to the aging of power transformers. The alarm rates of combustible gases ($H_2$, $C_2H_2$, $C_2H_4$, $CH_4$, and $C_2H_6$), TCG, CO, and $CO_2$ were analyzed. The end of life and failure rate (bathtub curve) of power transformers were also calculated based on the failure data from 1981 to 2014. The DGA gases related to discharge, overheating, and insulation degradation were determined based on alarm and failure rates. $C_2H_2$, $C_2H_6$, and $CO_2$ were discharge, oxidation, and insulation degradation parameters related to the aging of power transformers.

키워드

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Fig. 1. Cumulative number of power transformers andDGA sampling

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Fig. 2. Distribution of DGA results

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Fig. 3. Distribution of transformer with DGA results

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Fig. 4. DGA alarm rate related to the age of powertransformers

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Fig. 5. Weibull distribution of power transformers

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Fig. 6. Failure rate of power transformers

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Fig. 7. Alarm rate of H2 & C2H2 due to the aging oftransformers

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Fig. 8. Alarm rate of C2H4 & CH4 due to the aging oftransformers

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Fig. 9. Alarm rate of C2H6 & TCG due to the aging oftransformers

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Fig. 10. Transformers with the GOST type oil preservationsystem

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Fig. 11. DGA alarm as oil conservation systems

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Fig. 12. DGA alarm gases of transformers with the GOSTtype oil preservation system

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Fig. 13. Alarm rate of CO & CO2 due to the aging oftransformers

Table 1. DP in paper from three aged and four failed transformers

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참고문헌

  1. Dongjin Kweon. et al, "Development of management and operating System for Oil-immersed Transformer," KEPCO Final Report, 2008.
  2. IEC 60599, "Mineral Oil-Filled Electrical Equipment in Service-Guidance on the Interpretation of Dissolved and Free Gases Analysis" 2015.
  3. IEEE Std C57.104, "IEEE Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers," 2008.
  4. "Maintenance of Oil-Immersed Transformers," JAPAN Electric Technical Research Association, vol 54, no. 5, 1999.
  5. Michel Duval, "A Review of Faults Detectable by Gas-in-Oil Analysis in Transformers," IEEE Electrical Insulation Magazine, vol. 18, no. 3, pp. 8-17, 2002. https://doi.org/10.1109/MEI.2002.1014963
  6. Dongjin Kweon, et. al., "A Study on the Hot Spot Temperature in 154 kV Power Transformers," Journal of Electrical Engineering & Technology, vol. 7, no. 3, pp.312-319, July 2012. https://doi.org/10.5370/JEET.2012.7.3.312
  7. Goto, K. et al, "Measurement of winding temperature of Power Transformers and Diagnosis of Aging degradation by Detection of CO and $CO_2$," CIGRE 1990, Report 12-102.
  8. Sans, J. R., Bilgin, K. M., and Kelly, J. J. "Large Scale Survey of Furanic Compounds in Operating Transformers and Implications for Estimating Service Life," IEEE International Symposium on Electrical Insulation, pp. 543-53, 1998.
  9. IEEE C57.140, "Guide for the Evaluation and Reconditioning of Liquid Immersed Power Transformers," 2006.