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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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  • Former Community Member
    0 Former Community Member
    This is somewhere in the EU, Dave - so a 3 x 32A supply would be pretty normal (extravagant even in some places)


    However, 1 x 100A or 3 x 32A is still basically a 25kVA supply - and most of the equipment listed would be available as 3 phase (UK variants use links to operate on 1 phase supplies)


    So, if we had a capacity factor of about 0.4 for each dwelling that gives 25 x 0.4 = 10kVA  - this a house allowance.


    For the estate of 30 Houses that gives 300kVA, and allow a network capacity factor of say 0.4 - that gives a transformer and feeder rating of about 120kVA


    From there the next acceptable, and commercially available transformer would be selected.


    It's why you see estates of many hundreds of houses run on 800kVA ENATS transformers (which also allows for something like an extra 30% if needed on the LV feeders for "reinforcement" - ie one transformer on a 7.5MVA ring crashed out of service


    Regards


    OMS
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  • Former Community Member
    0 Former Community Member
    This is somewhere in the EU, Dave - so a 3 x 32A supply would be pretty normal (extravagant even in some places)


    However, 1 x 100A or 3 x 32A is still basically a 25kVA supply - and most of the equipment listed would be available as 3 phase (UK variants use links to operate on 1 phase supplies)


    So, if we had a capacity factor of about 0.4 for each dwelling that gives 25 x 0.4 = 10kVA  - this a house allowance.


    For the estate of 30 Houses that gives 300kVA, and allow a network capacity factor of say 0.4 - that gives a transformer and feeder rating of about 120kVA


    From there the next acceptable, and commercially available transformer would be selected.


    It's why you see estates of many hundreds of houses run on 800kVA ENATS transformers (which also allows for something like an extra 30% if needed on the LV feeders for "reinforcement" - ie one transformer on a 7.5MVA ring crashed out of service


    Regards


    OMS
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