Development of a Fire Protection Device for Railway DC Substations

1.5 kV DC (direct current) power is supplied to feeding systems of conventional lines in the greater Tokyo area. From 2005 to 2009, four fire accidents occurred at JR East DC substations due to DC ground faults. In those accidents, protective devices were broken by a DC ground fault. Most of those faults were caused by insulation deterioration of a DC circuit breaker in the cubicle. In light of that, the authors developed two types of devices that improve reliability in prevention of substation fires due to DC ground faults. One is a device that detects ground fault current in the grounding wire to the cubicle, and the other is a device that detects subtle smoke in the cubicle. The authors confirmed that these devices could detect signs of fire accidents at an early stage.


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  • Accession Number: 01606289
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 26 2016 12:47PM