On Friday, 14 April 2023 at 21:12:43 UTC+1, Jack Harry Teesdale wrote:
> On 14/04/2023 20:51, Commander Kinsey wrote:
> > On Fri, 14 Apr 2023 17:18:26 +0100, Jack Harry Teesdale
> > <noreply49...@yahoo.co.uk> wrote:
> >
> >> On 14/04/2023 14:50, Commander Kinsey wrote:
> >>> On Fri, 14 Apr 2023 11:08:52 +0100, Jack Harry Teesdale
> >>> <noreply49...@yahoo.co.uk> wrote:
> >>>
> >>>> On 14/04/2023 07:55, Commander Kinsey wrote:
> >>>>> On Wed, 12 Apr 2023 14:20:53 +0100, <hub...@ccanoemail.com> wrote:
> >>>>>
> >>>>>> On Wed, 12 Apr 2023 04:17:01 +0100, "Commander Kinsey"
> >>>>>> <C...@nospam.com> wrote:
> >>>>>>
> >>>>>>> I saw this statement online: "Higher voltage grids can't "feed in"
> >>>>>>> from domestic networks"
> >>>>>>> - referring to loads of solar in town A not being able to feed power
> >>>>>>> to town B through the HV network.
> >>>>>>> Is this true and why?
> >>>>>>>
> >>>>>>
> >>>>>> It would depend on a multitude of conditions - none of which
> >>>>>> can be
> >>>>>> determined without knowing all the intricacies of the distribution
> >>>>>> system and the grid in question.
> >>>>>> .. and the size of the " domestic networks ".
> >>>>>> My province < Ontario > introduced a huge " green energy " subsidy
> >>>>>> several years ago which became very popular very quickly and
> >>>>>> many rural areas needed distribution system upgrades to handle the
> >>>>>> many small solar installations. The subtransmission and
> >>>>>> transmission
> >>>>>> grid also needed upgrades - for the large commercial wind and solar
> >>>>>> installations - many of which were located in rural areas and
> >>>>>> therefore didn't have a robust distribution system to feed into.
> >>>>>> John T.
> >>>>>
> >>>>> Yes, there may be more current carrying capacity needed, but what I
> >>>>> read
> >>>>> seemed to suggest the HV transformers were somehow one way.
> >>>>
> >>>> There is nothing to prevent an HV network transformer being used in
> >>>> 'step -up' mode. Most windfarms feed in to the grid via a normal HV
> >>>> transformer in 'step-up' mode.
> >>>>
> >>>> What gets complicated is when you have a simultaneous step down-and
> >>>> step
> >>>> up requirement.
> >>>
> >>> Why? I've got a transformer sat here. If I put 240V in one side, I get
> >>> 12V out the other side. If I feed 12V in the other side, I get 240V out
> >>> the first side.
> >>
> >> That is not analagous to how a power networks operate. Discreet
> >> generation facilities can export by step-up transformers to the grid no
> >> problem. Likewise normal distribution systems operate by step-down Tx's
> >> to local networks.
> >>
> >> The complications come when you try to do both at the same time.
> >
> > Why? As I said, my transformer is happy to go either way with no
> > adjustment. So will the 415kV to 11kV transformers.
> Yes as long as the power is flowing one way or the other but not both
> simultaneously.
>
>

Consider Algebraic sums? Plus Millman's parallel generator theory?