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Onsite-substations

johnwicklover

Hi,

Just wondering for onsite-substations are they property of the DNO or the site owner? 

How would  the supplies be worked out? For example, will the DNO provide a supply point coming out of the substation with a fuse cut-out and meter ready to be connected to a panel board etc?

Thanks.

Regards,

J

  • Former Community Member
    0 Former Community Member

    the DNO assume that you always want them to do this for you, and charge handsomely for doing so, i found that they are difficult to deal with, and that there are many other companies out there who are both cheaper, and are far easier to deal with.

  • 0

    You should also check how easy your chosen supplier has access to spares. DNO transformers of 315, 500 and 1000KVA should all be off-the-shelf items, albeit usually at 440V nominal. 

    Regards,

    Alan. 

  • 0

    ours are all 1000KVA but the tap changers set at their lowest, and are all Schneider units.

  • 0

    grubbym: 
     

    the DNO assume that you always want them to do this for you, and charge handsomely for doing so, i found that they are difficult to deal with, and that there are many other companies out there who are both cheaper, and are far easier to deal with.

    well, we use another company, and, to be fair, are a pleasure to deal with, and have got us out of sticky situations in the past

  • 0

    Thanks for all your responses guys. 

    Also why don't they make cut-outs for greater than 600A supply. For example, this scenario where it can be upto 800A. I am assuming the blue line is the service cable coming into the customers property.  How will the meter for the energy supplier get connected ?

    Or as mentioned by others above, the metering will be done in the DNO owned/controlled bit?

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    Thanks.

  • 0

    there will be a metering cabinet, with a CT meter, looking fairly ordinary, but instead of the supply passing through it, it uses a current transformer. The meter will be accessible to you, but the CTs wont be

  • 0

    So the metering cabinet is inside the substation or outside ?

  • 0

    it will be in the low voltage switchroom, ie, your premises

  • 0

    Ahh I get you now. So it would be something like this: the service cable (blue line) coming into the LV switch room ( either brick built or GRP ) through a CT and going into lets say a big panel board? Thanks Johno12345.

  • 0

    service cable into your panel board onto an ACB or similar, the CTs being somewhere inaccessible upstream, fed to the meter by an armoured cable. 

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