[GTALUG] mysterious restarts

[Russell Reiter]

I wonder about grid security and whether or not a microgrid can be designed
to repel all borders. That is, only allow links to trusted sources.

The way things are headed in the IoT, perhaps power source monitoring will
detect the harmonic characteristics of each user in a trusted cluster and
when combined with the overall harmonics of the grid, this data can be used
for quality control and billing, or even equity trading between users.

Sent from mobile.
On Jun 25, 2016 3:21 AM, "ac via talk" <talk at gtalug.org> wrote:

> On Thu, 23 Jun 2016 11:43:19 -0400
> Lennart Sorensen via talk <talk at gtalug.org> wrote:
> > On Wed, Jun 22, 2016 at 07:39:34PM -0400, Michael Galea via talk
> > wrote:
> > > No, the device is not a UPS. It is a PLC that measures voltages,
> > > currents, real and reactive power of a 3-phase service.  It
> > > provides me the results as IEEE754 32-bit floating point numbers.
> > > It's me that truncates to 2 digits.
> > > You know I'm sorry I ever implied that the grid wasn't long term
> > > accurate at 60 Hz!  What I should have said was that in the short
> > > term the grid could be quite off 60 Hz but over the longer term it
> > > could average out.
> > > If I really needed to know the answer to the question of "how much
> > > out", I would get ask the PLC to just count cycles and send me the
> > > count with a timestamp. That would tell.
> > Well wikipedia claims the grid can be off by up to 10 seconds in north
> > america on this side of the continent.  The west and texas allow a
> > lot less.  So it can certainly be a bit off for quite a while.
> >
> this is a very interesting thread, i frequently ponder personal grid
> timing and other cycles using various oscillations, until the old 40Hz
> streak lights up (sync) my life
>
>
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