Cables

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3-May-12 Feeder Cable , Return Circuit & other cables- UG, BE3LOt2 1 L&T – F+F BE3 LOT2 PROJECT After this course trainee should be able to    Objectives:- Appreciate the importance of cables. Grasp how to select cable types? Know different types of Cables used in providing power Feeding and Return circuit ?  Understand different property of cables and how it is useful for various purpose?   Understand what is return circuit ? Know about installation procedure & what tools is re
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  Feeder Cable , Return Circuit & othercables- UG, BE3LOt2 3-May-12 L&T  –  F+F BE3 LOT2 PROJECT 1  Objectives:- After this course trainee should be able to  Appreciate the importance of cables.  Grasp how to select cable types?  Know different types of Cables used in providingpower Feeding and Return circuit ?  Understand different property of cables and how it isuseful for various purpose?  Understand what is return circuit ?  Know about installation procedure & what tools isrequired? 3-May-12 Delhi Metro Rail Corporation Limited2  Importance of cables- Why cablesare required?  To ensure continuity of supply under allconditions, the high voltage feed to thetraction substations is invariably arrangedfrom two sources of power withunderground cables, so that even if onesource fails, the other remains in service.Suitable protective equipments are installedat the sub-stations to ensure rapid isolationof any fault in cables or sub-stationequipment, so that the power supply for electric traction is maintained under allconditions. 3-May-12 Delhi Metro Rail Corporation Limited3  Why cables are required?  The power from Parkstreet sub-station is broughtthrough 25kV cables up to Central Sectt. SSP. Andthen from Central Sectt. SSP outgoing feeders, it isfed to ROCS.  A cable which supplies power to the ROCS (or flexible OHE wire) is known as a feeder. Generally,25kV 240sq.mm copper cable is used for power feeding. The power cables are terminated on theconductor rail with the help of feeder clamps.  To ensure electrical continuity, the parallel CRs areconnected with copper cables long enough toaccommodate the expected movement of therespective CR sections due to temperaturevariations. 3-May-12 Delhi Metro Rail Corporation Limited4
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