Emergency power requirement at a distance of 2 KM
Emergency power requirement at a distance of 2 KM
(OP)
For our installation , we are planning a common emergency DG set (EDG) of 2000 KVA , 415 volts. However there is one location with anticipated requirement of 200 KVA which is approximately 2 km distance from the EDG. The location and the logistics do not allow a separate EDG set of 200 KVA to be placed there.Therefore we have considered 415 volts cables from the EDG to the location.Considering the distance , the size and no. of cables required are more.There are suggestions that installing transformers at both the ends, and taking the required power through 11 KV cables , would be much more economical. Which option should we go for ?






RE: Emergency power requirement at a distance of 2 KM
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Emergency power requirement at a distance of 2 KM
can you please provide these tables? reference?
RE: Emergency power requirement at a distance of 2 KM
old field guy
RE: Emergency power requirement at a distance of 2 KM
A good site is this: http://www.openelectrical.org/wiki/index.php?title...
And there, you can find a table that is very similar to "my tables".
You find it at http://www.openelectrical.org/wiki/index.php?title...
The results are not identical, but they clearly show that you cannot go much further than around 200 m with the 200 kW load.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Emergency power requirement at a distance of 2 KM
Use a Yd transformer at the source (delta makes things easier for the generator) and a Dy at the load (avoids difficulties with protection and earthing).
RE: Emergency power requirement at a distance of 2 KM
RE: Emergency power requirement at a distance of 2 KM
That is, check poles and insulators + cross-bars, wires, transformer cost and control (breakers/switches) cost .. Prices may go up for one part, but down for another part of the installation.
RE: Emergency power requirement at a distance of 2 KM
RE: Emergency power requirement at a distance of 2 KM
RE: Emergency power requirement at a distance of 2 KM
You will need around 20 thick cables in parallel for each phase. That is 60x185 mm2 cables for the phases and probably the same number for the Neutral, depending on what load there is. Not practical. And very, very expensive. And very tempting for the Cu thieves.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Emergency power requirement at a distance of 2 KM
However, 5 parallel groups of 3 single core cables of 500 mm^2 copper could provide a same voltage drop [on my appreciation it could be more than 350000 US Dollars].
RE: Emergency power requirement at a distance of 2 KM
I think the HV cable would be more like 1x 3C/120mm² for a volt-drop on the HV feeder of about 2% (2% of 3.3kV being 66V, and the line current being about 53A). Could be a much bigger saving.
RE: Emergency power requirement at a distance of 2 KM