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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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    Interesting - here in the UK we'd normally have only a single phase to a house unless it was very large. 

    A single phase 100a fuse holder in nearly all new houses, with either a 60,80 or 100A fuse fitted.

    The cable to the house would be sized for that, so 35mm2 perhaps,  and the main 3 phase cable that joins to would be larger, but sized either on voltage drop or current rating, but based on a far lower load per house, perhaps 10A per house - reflecting the fact that most loads are not on for long, and not on in all houses at the same time, so you will find a 1MVA transformer with each phase feeding a couple of 400A fuses, and perhaps 50-70 houses per phase, or a bit less if there are also commercial  users on the same transformer.

    Clearly the 100A fuse in the house, but  so many sharing the transformer relies heavily on this diversity factor being chosen correctly, and it only works well when you have enough properties in the group to give a decent averaging, the assumption is something like a Poisson distribution as the no of houses rises - I'll try and dig the papers out tommorow.

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  • 0
    Interesting - here in the UK we'd normally have only a single phase to a house unless it was very large. 

    A single phase 100a fuse holder in nearly all new houses, with either a 60,80 or 100A fuse fitted.

    The cable to the house would be sized for that, so 35mm2 perhaps,  and the main 3 phase cable that joins to would be larger, but sized either on voltage drop or current rating, but based on a far lower load per house, perhaps 10A per house - reflecting the fact that most loads are not on for long, and not on in all houses at the same time, so you will find a 1MVA transformer with each phase feeding a couple of 400A fuses, and perhaps 50-70 houses per phase, or a bit less if there are also commercial  users on the same transformer.

    Clearly the 100A fuse in the house, but  so many sharing the transformer relies heavily on this diversity factor being chosen correctly, and it only works well when you have enough properties in the group to give a decent averaging, the assumption is something like a Poisson distribution as the no of houses rises - I'll try and dig the papers out tommorow.

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