Constituents of Supply System:
1) Substation: It has 132kV, 50c/s three phase double circuit input supply and output of 25 kV, 50 c/s single phase double circuit.
2) Feeding posts: A double circuit line between substation outputs to feeding post at tracks as protected and controlled feeder line.
3) Feeding and sectioning arrangements: The arrangement is used to avoid unbalance in loading of three phase power system.
4) Sectioning and paralleling posts: It is an arrangement of power system feeding for two parallel rail track supply lines between feeding post and neutral section.
5) Sub sectioning posts: Each subsection again further divided in one or more sections and parallel posts. They are normally 10-15km in length.
6) Elementary section: Subsection of 10-15 km in length is too large for repairs and maintenance point view so for fast isolation of faulty part, the subsection is further divided into elementary section.
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