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An Analysis of Influence Between the Power Feeding Line Insulation and Negative Rail Potential for the DC Ground Fault Protection in the Rubber Wheel System

고무차륜시스템에서의 지락보호를 위한 급전선로 절연과 부극전위와의 영향 분석

  • 정호성 (한국철도기술연구원) ;
  • 신승권 (한국철도기술연구원) ;
  • 김형철 (한국철도기술연구원) ;
  • 박영 (한국철도기술연구원) ;
  • 조상훈 (포스코ICT 철도교통사업부 E&M기술팀)
  • Received : 2013.02.12
  • Accepted : 2013.03.06
  • Published : 2013.04.01

Abstract

We have analyzed influence of potential rise in negative bus, which caused by decrease of power feeding line insulation, upon protecting method of DC ground protection device which detecting potential rise between negative bus and ground in order to detect ground fault in the rubber wheel system. For this purpose, we proposed negative potential equation between negative bus and ground and calculated negative potential according to system condition changes by estimating power feeding line insulation changes in steel wheel system and rubber wheel system, and equalizing DC power feeding system when ground fault occurred. Also, in order to estimate negative potential of real system, we modeled the rubber wheel system, and simulated normal status, grounding fault occurrence and power feeding line insulation changes. In normal status, negative potential did not rise significantly regardless of vehicle operation. When ground fault occurred, negative potential rose up over 300V regardless of fault resistance. However, we also observed that negative potential rose when power feeding line insulation dropped down under $1M{\Omega}$. In conclusion, our result shows that in case of rubber wheel system unlike steel wheel system, relay will be prevented maloperation and insulation status observation can be ensured when ground over voltage relay will be set 200V ~ 300V.

Keywords

References

  1. Myung-Hwan Min, "An Analysis on Rise of Rail Potential And A Study on Control Method for It in DC Feeding System", The Transactions of the Korean Institute of Electrical Engineers, Vol.60, No.3, pp.680-685, 2011.3. https://doi.org/10.5370/KIEE.2011.60.3.680
  2. Moonseob Han, "Evaluation of Rail Leakage Current and Potential in DC Railway", Journal of the Korean Society for Railway, Vol.12, No.1, pp.161-166, 2009.2
  3. Seong-Gil Kim, "Urban transit technology materials(7) Electricity", Subway Construction of Seoul Metropolitan Government Office, 2005.
  4. Chien- Hsing Lee, Chien - Jung Lu, "Assessment of Grounding Schemes on Rail Potential and Stray Currents in a DC Transit System", IEEE Transactions on power delivery, Vol.21, No.4, 2006.10.
  5. Snag-Hee Kang, "Integrated Protection Method for DC Railway Systems", The Transactions of the Korean Institute of Electrical Engineers, Vol.60, No.2, pp.285-292, 2011.2 https://doi.org/10.5370/KIEE.2011.60.2.285
  6. Hosung Jung, "An evaluation of selective grounding fault protective relaying technique performance on the ungrounded dc traction power supply system", The Transactions of the Korean Institute of Electrical Engineers, Vol.61, No.12, 2012.12.
  7. DC Electric Railway Protection Technology Investigation Committee "Investigation on Protection and Coordination of Protection System in DC Electric Railway", The Institute of Electrical Engineers of Japan, 1994.
  8. N.H Kim, "Development of DC switch gear for LRT system protection and control(I)", The 2002 fall Conference of the Korean Society for Railway, pp.995-1000, 2002.10