Currently I am using overhead transmission line for the electricity for the distance of 2 km. I want to convert that line with underground cable. Please suggest me which cable i should use and capacity of that cable, which gives me minimum cost.
Load requirement is 5 MW,
Current transmission line is 11KV feeder.
This is a purely economic issue - just look up cable data from reputable manufacturers and get some quotes. They will be more than the cost of overhead cables. Underground cables are aesthetically good but expensive and difficult to fix if they fail, hence the need for good quality product.
5 MW @ 80% pf = 6.25 MVA/11 KV = 568 AMPS. Per BS7671, Assuming thats delta not star, thats two runs of (3c x 185mm2), separate the runs 20cm center to center typical
As Tony Maine said, its about economics, compare
1. 3c cable for direct buirial, XLPE/AWA/PVD/AL to 3 x 1c cable in conduit
and 3 x 1c cables separated typically 20cm OC (of course separation distance is V dependant)
2. how your choice is the previous item if related to your available trenching machinery (Ditchwitch type digger compared to backhoe)
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