Control & Relay Panel
Power Resistors
Traction Resistors
Bus Duct
Crane/ Motor
   Control Resistors
Cable Tray
Fabricated Items
Basic Parameters for Resistors Design ConsiderationConstruction of a Resistance Unit
Characteristics of Different types of Material used for of Resistance
Different Types of Resistance Grids
  • Rigid steel construction to withstand vibration.
  • Hot dip galvanized / sheet steel coated with anticorrosive heat resistant paint
  • Standard followed: BS 587 / IEC 77 / IEC 322 / IEEE 32 / IPSS / IS Specification as applicable
  • Primary / secondary Insulation
  • Draw out type construction for crane resistances for easy removal of any resistance tier without disturbing others
  • Grid junctions are tig welded in case of application where vibration exists, otherwise bolted connection
  • Resistances mounted on ground are provided with bolted inter grid connection to facilitate replacement of individual grid
  • Terminals are provided at bottom of resistance unit at a suitable height to facilitate termination of external cables
  • Sufficient number of tapping is provided for adjustment of resistance value at site
  • All resistance grids are tested for current rating and ohmic value and standardized. Hence, the spares supplied are replaceable with original grids
  • Sufficient electrical clearance (more than specified in IS) is maintained between resistance elements and frame
  • In multitier formation of resistance banks, grids are derated from normal rating to take care of extra heating
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