[AusNOG] DC undervoltage issues

[Joshua D'Alton]

Cheers James and Bevan.

And I assume the "super high price" for electricity is substantially higher
than the cost of running the generators in that period (ie
capex/depreciation + cost of diesel < cost of power)? Can you comment Bevan
on if its close, or far away from utility power costs in general? as in its
obviously more expensive to power the DC via diesel long term (either due
to raw fuel cost or with generator costs included), but how close is it?
and further, how much of a bet/risk is it to purchase the cheaper power
with these restrictions (having to go off-grid or else pay a premium)?

I'm guessing its probably a case of using historical data and just match
things up to work out how many days per year on average, the cost of diesel
and generators during that period, and making sure its less than the X%
more per year paid for utility power with no usage restrictions, ?

Might be another thread for this, or even off-list, but I'd imagine listers
would find this interesting or useful.


On Wed, Jan 15, 2014 at 11:30 PM, Bevan Slattery <bevan at slattery.net.au>wrote:

>
>
> From: Joshua D'Alton <joshua at railgun.com.au>
> Date: Wednesday, 15 January 2014 10:17 pm
> To: James Braunegg <james.braunegg at micron21.com>
> Cc: "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net>
>
> Subject: Re: [AusNOG] DC undervoltage issues
>
> > Does the energy provider call up the DC and say oh hey, as per agreement
> go onto generators for X hours thanks, your next bill will be credited ABC
> ?).
>
> Goes like this:
>
> Option 1: Energy Provider rings and says due to network instability can we
> ask you to shed xx% of load over this period of time
> Option 2: Major DC rings energy provider and says we are seeing network
> instability – we are considering moving over to internal power.  What is
> your advice/recommendation (graceful exit from grid)
> Option 3: Power is outside of tolerance on one or more feeds and the DRUPS
> engines kicks in – no phone call required, but courtesy call is usually
> given post fact (all in LV side and the DC’s control)
> Option 4: Loss of HV power to site will require call to provider for
> approval before bringing back on grid (safety and capacity confirmation)
>
> The rest of the “commerciality” is confidential.
>
> [b]
>
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