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A Study on the Optimal Divergence Spacing of the Connecting Grounding Rod to the Dangerous Voltage in the Global Earthing Network of Urban Rail Transit

도시철도 통합접지망에서의 위험전압에 따른 연접접지봉의 최적 분기간격에 관한 연구

  • 정호성 (한국철도기술연구원 스마트전력시스템연구단) ;
  • 박영 (한국철도기술연구원 첨단고속철도연구실) ;
  • 김형철 (한국철도기술연구원 스마트전력시스템연구단) ;
  • 김진희 (한국철도기술연구원 스마트전력시스템연구단) ;
  • 김재문 (한국교통대학교 철도전기전자공학과) ;
  • 조대훈 (노이즈프리미어랩(주))
  • Received : 2012.04.30
  • Accepted : 2012.08.20
  • Published : 2012.09.01

Abstract

Urban rail transit tends to global grounding system in order to control ground potential rise and potential differences between electric equipments. In addition, global grounding system can discharge the large capacity surge current to the ground safely. Since some railway electric equipments are installed all section of line, the global grounding system connected with the connecting grounding wire is more effectively. However, if the fault occurred in the connecting grounding wire area, some dangerous voltage is generated. So, the installation of additional grounding rod will be required. In this study, the global grounding system is simulated using CDEGS program to analyze the divergence spacing of additional ground rod depending on dangerous electric potential characteristics. Grounding net of the each station is modelled in depending on the size of the platform, and the spacing of the connecting grounding rod are compared 50m, 100m, 250m and 400m. Simulation results considering of earth resistivity and underground condition of the connecting grounding wire, spacing of the connecting grounding rod is that less than 250m to spacing of the ground rod was appropriately confirmed.

Keywords

References

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