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Theoretically optimal location of a distribution substation

Former Community Member
Former Community Member
Hello, 
I have the following problem with the preliminary design stage of a residential area:

The software I use can calculate a theoretically optimal location of a distribution substation for low-voltage networks. This place is calculated as a "center of power demand" or "center of gravity" of electrical consumers.

If the substation locates in this optimal place, we can design 0.4kV distribution feeders with a minimum length and power losses in low-voltage feeders are minimal. 

I understand it’s almost impossible to put it exactly there, and I consider some sites nearby. But the architect believes that this is unacceptable in terms of landscape design and wants to place the substation in a far corner.

Who should be the arbiter in this situation?  DNO representative takes a neutral position.  Local authorities are completely on architect side, they do not care that long power cables will heat the atmosphere for many years to come.

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  • 0
    Hi Alex

    I see that you are considering this in a non-UK country from the 10kV/400V substation. Is it usual to supply all 3 phases to each property, and what is the estimated diversity applied loading per house? If we worked with typical UK numbers and a single phase each, the supply cable would be fused at 400A and about 2kVA per house assumed. That would be about 100 houses on a cable, but as loads are rising one should consider more per house, with EV charging perhaps 4 or 5 kVA. Even so your site would work with only one cable to all properties, and if you are willing to fit 2 or 3, you should have a very safe design with 26 properties total, and perhaps a 500 kVA transformer. This would allow for expansion on surrounding land or further consumption by this development. OMS is quite right, the civils and jointing cost will be much more than the cable, so it is not worthwhile to comprimise cable costs.
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  • 0
    Hi Alex

    I see that you are considering this in a non-UK country from the 10kV/400V substation. Is it usual to supply all 3 phases to each property, and what is the estimated diversity applied loading per house? If we worked with typical UK numbers and a single phase each, the supply cable would be fused at 400A and about 2kVA per house assumed. That would be about 100 houses on a cable, but as loads are rising one should consider more per house, with EV charging perhaps 4 or 5 kVA. Even so your site would work with only one cable to all properties, and if you are willing to fit 2 or 3, you should have a very safe design with 26 properties total, and perhaps a 500 kVA transformer. This would allow for expansion on surrounding land or further consumption by this development. OMS is quite right, the civils and jointing cost will be much more than the cable, so it is not worthwhile to comprimise cable costs.
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