Nut upsdev - May 2017 - NUT namespace: RFC for new variable addition

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.

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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On May 24, 2017, at 5:11 AM, Arnaud Quette <arnaud.quette at 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.

On May 24, 2017 1:08:09 PM GMT+02:00, Charles Lepple <clepple at
gmail.com> wrote:
>On May 24, 2017, at 5:11 AM, Arnaud Quette <arnaud.quette at
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 at 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
--
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