Basics of Railway Signaling
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By Somnath Banerjee
Signalling Power System

Power supply for signalling systems require special considerations because

  • Modern rail transport system depends the performance of which affects modern society and economy as never before and cannot be allowed to fail due to disruptions of the signalling system.
  • The power from commercial sourcees do not provide the availibility that a signalling system requires.
  • The commercial power supply carries substantial electrical surges which is capable of crippling signalling circuit components.
  • Signalling power supply feed track side components through cables and which exposes the power supply components to electrical surges mainly due to lightning from the track side.
  • Signalling systems need to be fail safe and electrical isolation from earth plays an important role in this.