[time-nuts] Power glitch - Sat morning

[Adrian Godwin]

Here in UK, no.

It's available at extra installation cost and some people with a big lathe
or other machinery have it as do farms and industrial locations. But the
typical domestic house doesn't : phases are commonly distributed down the
street with progressive phases on each property.


On Wed, Apr 1, 2020 at 6:15 PM Mark Spencer <mark at alignedsolutions.com>
wrote:

> Would a time nut in Europe in a typical single family home have access to
> all three phases ?
>
> If so would there be any benefit to monitoring the frequency of each phase
> ?
>
>
> Mark Spencer
>
> mark at alignedsolutions.com
> 604 762 4099
>
> > On Apr 1, 2020, at 9:50 AM, Poul-Henning Kamp <phk at phk.freebsd.dk>
> wrote:
> >
> > --------
> > In message <3b7684a9-2702-295b-4935-33a9b3f47182 at earthlink.net>, jimlux
> writes:
> >
> >> In EU, where 240V is the default line voltage, I wonder what the 3
> phase
> >> distribution is?  Is it 415 delta / 240 star
> >
> > 230V actually, and yes, it is universally 400 delta / 230 star.
> >
> > That's also why you only ever see an auto-tranformer if somebody
> > imported gear (typically computers) from USA.
> >
> > The most important difference from US is that co-poling of LV and
> > MV has almost never been practiced over here, so transients almost
> > only happen in thunder.
> >
> > For the same reason MV (typically 10kV) to LV transformers are
> > typically larger than the polemounted "buckets" used in USA.
> >
> > Her in DK MV/LV's are usually around 1MW, and they will supply
> > about a square kilometer of town or ten square kilometers of
> > rural landscape.
> >
> > An advantage of the large number of installations per trafo is that
> > load is even across the three phases, so you can run the transformer
> > closer to spec than any utility in USA would be happy with.
> >
> > Protective grounding differs, between countries and in countries,
> depending
> > on how hard it is to drive a good PE electrode (DK: Trivial, NO: Forget
> it)
> >
> > On the flip side, while we have agreed on the voltage, there are 13
> different
> > national standards for the plugs and sockets on consumer-stuff...
> >
> > --
> > Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> > phk at FreeBSD.ORG         | TCP/IP since RFC 956
> > FreeBSD committer       | BSD since 4.3-tahoe
> > Never attribute to malice what can adequately be explained by
> incompetence.
> >
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