On June 14, 2017 2:38:16 PM GMT+02:00, Arnaud Quette <arnaud.que...@gmail.com> wrote: >(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
http://www.apc.com/us/en/faqs/FA156201/ explains a bit of the hassle -- Typos courtesy of K-9 Mail on my Redmi Android _______________________________________________ Nut-upsdev mailing list Nut-upsdev@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsdev