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  4. OHE (Over Head Equipment - Cantilever)

OHE (Over Head Equipment-Cantilever)

Cantilever hold the assembly of contact wire, catenary and dropper assembly. It transfers all vertical load, lateral forces and bending moment load through insulator to Mast. It is an insulated swivelling type structural member and keeps the overhead catenary system in a position assisting smooth current collection by the pantograph at the designed speed. It is flexible with all joints having swivelling arrangement permitting movement in all direction.

  1. Portal :

    Portal structures are used to accommodate OHE of many lines (2 to 8 tracks) where it is not possible to erect independent mast due to restriction of track center. There are three types of portal namely N, O and R type. Clear span (distance between inner face) in N type- 10- 20M (4 tracks), O type – 20-30M (upto 6 tracks), R type – 30-40M (upto 8 tracks).

  2. MAST :

    Different types of steel mast which are used in railway are BFB (broad flanged beam), RSJ (rolled steel joist) and K-type, B-type fabricated mast.

    Selection of Mast

    • General guidelines for use of different design of mast is as follows:
    • Normal location and OHE on tangent Track : BFB Mast
    • Normal Location on curves : RSJ Mast
    • Structures with multiple OHE with anchorage : K150, 175
    • Turn-out location with higher torsion stress : K200, 250

     

  3. ROLLED MAST (RSJ, BFB)
  4. Two track Cantilever Structure (TTC) :

    This is an alternative where it is not possible to manage with mast as well as portal.

  5. SPS (Small Part Steel)
  6. TSS (Traction Sub-Station)
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