All,
A few of my personal notes from what I learned at an
SDG&E public presentation on this topic Spring 2018,
these notes mostly came from the Q&A. The most
relevant page in the power point Rob forwarded is page 8:
- along with "back country", power shutoff can/will also
affect the wildland urban interface (WUI), those areas
that border "open space". Deep urban dwellers not so
much unless a major transmission line is shut down
- "Patrolled"= inspected. SDG&E has no other
means to determine grid integrity than eye-balls,
either in trucks or helicopters
- a multi-day Santa Ana event (we know what those are
like) will postpone the start of inspections until forecast
wind conditions are below SDG&E's hazard thresholds
- along with forecast wind gust thresholds,
there are forecast sustained wind thresholds
that will hold the start of inspections
- a three-day Santa Ana event means grid sections that
have been turned OFF, will likely not be re-energized
until the end of day four at earliest depending on the
availability of inspection resources
- commercial and residential restoration is the lowest
priority
- how many $'s worth of frozen goods will thaw to an
unsafe temperature after four days?
- how many $'s worth of refrigerated goods will warm to
an unsafe temperature after four days?
- if your water source is an on-site well, do you have
four days worth of pumped storage?
- back country fire stations that depend on well water
are equally affected. Separately, a Cleveland NF fire
captain told me his stations are not equipped with
gensets, nor are Cal Fire stations
- ha! I have solar! Grid-connected solar will be
automatically OFF during PSPS events for SDG&E
worker safety
IMHO, Santa Ana event prep now includes genset and fuel for
four days. ready. set. go.
Respectfully,
Dennis
KA6DUH
On 7/24/2019 1:55 PM, Rob
Freeburn
k6rjf.rob@...
[SDGARES] wrote:
ARES Members,
Attached for your situational awareness is a Sempra
presentation on
the Public Safety Power Shutoff (PSPS) program.
As you know, when the power drops, we start to lose
cell towers and
repeaters because back-up power supplies do not always
work.
.. . . Rob
K6RJF