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Enabling the DSO transition - A consultation on the ESO’s approach to Distribution System Operation (2021)

Former Community Member
Former Community Member
This is an opportunity for a more coordinated approach in the development of the whole electricity system, through joined-up thinking and application of systems engineering principles. Read our response to the Energy System Operator (ESO) consultation.
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We believe:



  • A truly ‘whole (electricity) system’ approach requires a broader perspective.

  • Community energy enterprises (physical or virtual), energy hubs and individual customers (enabled by technology), will have an increasing influence on physical energy flows across distribution, and ultimately transmission networks.

  • Greater consideration is needed, as to the important role that flexibility from Distributed Energy Resources (DERs) will play in the wider electricity, and ultimately whole energy system.

  • ESO and DSOs must continue to evolve systems and processes that minimise inconsistencies, including applying sensitivity analyses to better understand the potential impact of any unresolved differences.

  • A more fundamental review of industry code governance is required.


To share your thoughts log in to your IET Community account and add your comments below. You can read our full response here: Enabling the DSO transition.
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    I can see the merits of a 400/690 volt supply in some cases to reduce currents and cable costs. Particularly for large scale lighting when 400 volt lamp ballasts/drivers can be connected phase to neutral, rather than between phases on a 230/400 volt system.

    Also for electric motors as the larger sizes have 400 volt windings that may be delta connected on a 230/400 volt system or star connected on a 400/690 volt system.


    BTW, a quick question for those who have worked on 440/690 volt systems. What is the ACTUAL voltage ? Is it as described, or does it tend to be 415/720 in practice, just as most nominal 230/400 volt systems tend to be 240/415 in practice.


    I see little merit in 690/1k2 volt systems as very limited equipment is available for this voltage, and standard 600/1000 volt SWA cables cant be used.

    Transformers could of course be used, but in that case why not use 11KV ? and save the capital cost and the losses in adding another stage of transformation.
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    I can see the merits of a 400/690 volt supply in some cases to reduce currents and cable costs. Particularly for large scale lighting when 400 volt lamp ballasts/drivers can be connected phase to neutral, rather than between phases on a 230/400 volt system.

    Also for electric motors as the larger sizes have 400 volt windings that may be delta connected on a 230/400 volt system or star connected on a 400/690 volt system.


    BTW, a quick question for those who have worked on 440/690 volt systems. What is the ACTUAL voltage ? Is it as described, or does it tend to be 415/720 in practice, just as most nominal 230/400 volt systems tend to be 240/415 in practice.


    I see little merit in 690/1k2 volt systems as very limited equipment is available for this voltage, and standard 600/1000 volt SWA cables cant be used.

    Transformers could of course be used, but in that case why not use 11KV ? and save the capital cost and the losses in adding another stage of transformation.
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