(hmmm, finally hitting the Sent button...) 2017-05-24 13:56 GMT+02:00 Jim Klimov <jimkli...@cos.ru>:
> On May 24, 2017 1:08:09 PM GMT+02:00, Charles Lepple <clep...@gmail.com> > wrote: > >On May 24, 2017, at 5:11 AM, Arnaud Quette <arnaud.que...@gmail.com> > >wrote: > >> > >> Hi all, > >> > >> here is another one, related to ATS (automatic transfer switch) this > >time. > >> > >> in order to track "dephasing" between input sources (1 and 2), I'd > >like to add a new variable: "input.phase.shift" > >> > >> > >> Details and implementation can be found on: > >> https://github.com/networkupstools/nut/pull/433 > >> > >> Comments and feedback warmly welcome. > > > >I don't think "dephasing" is common usage, but "phase shift" should > >suffice. > > > >Also, how does this apply to 3-phase systems? Is it nominally 120 > >degrees? > > > >Strange that this has not come up before. > >_______________________________________________ > >Nut-upsdev mailing list > >Nut-upsdev@lists.alioth.debian.org > >http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsdev > > It was my impression too. However it seems the 'phase shift' usually > refers to lag between Amperage and Voltage waves, while this issue is (if I > get it correctly) about two separate ATS inputs fluctuating on their own > different clock-offsets. Should be same freq (50 or 60) though, or likely > assumed so - which might not be guaranteed in real life either ;) On the > other hand, if the freqs differ, this reported skew degree will vary over > time (if detected and reported honestly)... > Jim is right, this is very tied to ATS. I don't see that applying to 3ph UPS, since there is only 1 source. The point for ATS is that a source may be the main, and the other a UPS. Hence the potential phase shift. The nominal value is 0 cheers, Arno -- Eaton Data Center Automation Solutions - Opensource Leader - http://42ity.org NUT (Network UPS Tools) Project Leader - http://www.networkupstools.org Debian Developer - http://www.debian.org Free Software Developer - http://arnaud.quette.fr
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