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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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    If that really is the range of loads, I don't think that 32A main fuses (and presumably cables for the service) will be adequate. Unless all the appliances are 3 phase, the current draw will undoubtedly be somewhat uneven and 32A fuses are quite delicate. The dishwasher, washing machine and tumble dryer, aircon, etc, would have to be carefully spread amongst the phases, which is unlikely. 3 x 60A would seem more reasonable, and allow single phases to be used for rooms with more than one appliance. Each property also needs a degree of coordination of installation to prevent all the loads being on one phase for the whole group. It is easy to connect every house power circuits to the red phase for example, and problems with main fuses are likely! This is the kind of thing which electricians do, they probably don't understand that it matters.
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  • 0
    If that really is the range of loads, I don't think that 32A main fuses (and presumably cables for the service) will be adequate. Unless all the appliances are 3 phase, the current draw will undoubtedly be somewhat uneven and 32A fuses are quite delicate. The dishwasher, washing machine and tumble dryer, aircon, etc, would have to be carefully spread amongst the phases, which is unlikely. 3 x 60A would seem more reasonable, and allow single phases to be used for rooms with more than one appliance. Each property also needs a degree of coordination of installation to prevent all the loads being on one phase for the whole group. It is easy to connect every house power circuits to the red phase for example, and problems with main fuses are likely! This is the kind of thing which electricians do, they probably don't understand that it matters.
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