Power grid logging during the eclipse?
My amateur time-lapse montage at
https://www.youtube.com/watch?v=ruWELrNP69k with NOAA GOES-East data
clearly shows that the "/night lights/" did not turn on during Totality
(/at the viewing resolution/ that I selected) that lasted just under 3.5
mins in my area.
Regards.
--- Matha.
On 4/10/24 10:12, Jeremy Nichols via time-nuts wrote:
Does anyone know the size of the Moon’s shadow on the Earth? From satellite
views, I get the feeling it could be the size of one or more US a states.
That would knock out a lot of solar production and cause a lot of
nightlights to illuminate.
Jeremy
On Wed, Apr 10, 2024 at 7:14 AM Chris Caudle via time-nuts <
time-nuts@lists.febo.com> wrote:
On Monday, April 8, 2024 9:23:47 PM CDT Scott Newell via time-nuts wrote:
Was anyone logging the eastern US power grid today during the
eclipse? I've got some pretty simple hardware at home and about 50
miles away at work. Both are showing a bit of weirdness today around
19:00 UTC.
I have no idea how much power disruption would be needed to cause that
amount
of change in the power distribution, but I see that there is a few MW of
solar
generation in that general quadrant of the state. I don't know if the
shadow
traversing the solar generation plants could explain the behavior, but
would
probably be the first easy answer I would look for.--
Chris Caudle
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Would anybody have data about the eclipse of August 21, 2017?
Also, there have been some annular eclipses. Most recently on October 14, 2023 but the Wikipedia has a list: https://en.wikipedia.org/wiki/List_of_solar_eclipses_visible_from_the_United_States
On Apr 10, 2024, at 4:50 PM, Bob Camp via time-nuts time-nuts@lists.febo.com wrote:
Hi
There are maps that show the path of the eclipse and how long a given point was “in the dark”.
Typical numbers for full darkness at center of path came in around 3 to 4 minutes.
From the center, you could see the “light edges” of the zone of darkness in all directions. Light
started to drop a bit before it went completely dark, but that was nowhere near the change that
the full on total eclipse created.
One of many sites with information:
https://eclipsophile.com/2024tse/
Bob
On Apr 10, 2024, at 11:12 AM, Jeremy Nichols via time-nuts time-nuts@lists.febo.com wrote:
Does anyone know the size of the Moon’s shadow on the Earth? From satellite
views, I get the feeling it could be the size of one or more US a states.
That would knock out a lot of solar production and cause a lot of
nightlights to illuminate.
Jeremy
On Wed, Apr 10, 2024 at 7:14 AM Chris Caudle via time-nuts <
time-nuts@lists.febo.com> wrote:
On Monday, April 8, 2024 9:23:47 PM CDT Scott Newell via time-nuts wrote:
Was anyone logging the eastern US power grid today during the
eclipse? I've got some pretty simple hardware at home and about 50
miles away at work. Both are showing a bit of weirdness today around
19:00 UTC.
I have no idea how much power disruption would be needed to cause that
amount
of change in the power distribution, but I see that there is a few MW of
solar
generation in that general quadrant of the state. I don't know if the
shadow
traversing the solar generation plants could explain the behavior, but
would
probably be the first easy answer I would look for.
--
Chris Caudle
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There are delay circuits built into most street lights, so it’s likely that
a 4-minute solar totality might not be long enough to trip the circuits.
Jeremy
On Thu, Apr 11, 2024 at 7:46 AM mcleannb--- via time-nuts <
time-nuts@lists.febo.com> wrote:
Is the street lighting in that part of the world automatic like here down
under? Did a whole bunch of street lighting sensors all detect dark at the
same time and turn the street lights on?
Nic
Near Sydney Australia.
-----Original Message-----
From: Joseph B. Fitzgerald via time-nuts time-nuts@lists.febo.com
Sent: Thursday, April 11, 2024 1:13 AM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Cc: Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu
Subject: [time-nuts] Re: Power grid logging during the eclipse?
The change in load on the grid was fairly unusual during the eclipse with
rapid changes in the bulk power system. See the graph linked below from
grid operator ISO New England. Y axis is megawatts of demand, while the
x
axis is Eastern Daylight time. Both days were sunny, but we see the
dramatic effect of the moon's shadow reducing the amount solar generation
on
the afternoon of the 8th.
https://bhows.org/New_England_grid_eclipse.png
It is not too surprising (to me anyway) that the grid frequency wandered
around a bit during this unusual load swing.
-Joe
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Nic near Sydney Australia asked:
Is the street lighting in that part of the world automatic like here down
under? Did a whole bunch of street lighting sensors all detect dark at the
same time and turn the street lights on?
Yes, but the streetlights were on only during the few minutes of totality, and the path of totality was in the northern rural portion of the region. It got a bit colder, so I imagine a few electric heaters turned on here and there, but the extra load on the grid is almost completely explained by the loss of solar power:
https://isonewswire.com/2024/04/09/new-england-power-grid-reliable-throughout-eclipse/
Note that even outside the path of totality, solar power was dramatically reduced, here is a graph of solar power reaching the ground made in Boston where the sun was obscured at a maximum of 93% at 3:30 in the afternoon.
https://bhows.org/Weld_Hill_eclipse.png
Note that even well outside the path of totality, at the peak of the eclipse there was no solar power to speak of. Data are from Harvard's Weld Hill research station. Both days were sunny with only a few afternoon clouds.
-Joe Fitzgerald
On Thu 2024-04-11T07:52:44-0700 Jeremy Nichols via time-nuts hath writ:
There are delay circuits built into most street lights, so it’s likely that
a 4-minute solar totality might not be long enough to trip the circuits.
4 minutes is plenty long enough
https://www.ucolick.org/~sla/eclipse20240408/2/IMG_7117.JPG
--
Steve Allen sla@ucolick.org WGS-84 (GPS)
UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855
1156 High Street Voice: +1 831 459 3046 Lng -122.06015
Santa Cruz, CA 95064 https://www.ucolick.org/~sla/ Hgt +250 m
On 2024-04-11 10:52, Jeremy Nichols via time-nuts wrote:
There are delay circuits built into most street lights, so it’s likely
that
a 4-minute solar totality might not be long enough to trip the
circuits.
Where we were in Ohio the streetlight came on after about 30 seconds in
and went off roughly the same time after the end of totality.
Regards
Marshall Eubanks
Jeremy
On Thu, Apr 11, 2024 at 7:46 AM mcleannb--- via time-nuts <
time-nuts@lists.febo.com> wrote:
Is the street lighting in that part of the world automatic like here
down
under? Did a whole bunch of street lighting sensors all detect dark at
the
same time and turn the street lights on?
Nic
Near Sydney Australia.-----Original Message-----
From: Joseph B. Fitzgerald via time-nuts time-nuts@lists.febo.com
Sent: Thursday, April 11, 2024 1:13 AM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Cc: Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu
Subject: [time-nuts] Re: Power grid logging during the eclipse?The change in load on the grid was fairly unusual during the eclipse
with
rapid changes in the bulk power system. See the graph linked below
from
grid operator ISO New England. Y axis is megawatts of demand, while
the
x
axis is Eastern Daylight time. Both days were sunny, but we see the
dramatic effect of the moon's shadow reducing the amount solar
generation
on
the afternoon of the 8th.https://bhows.org/New_England_grid_eclipse.png
It is not too surprising (to me anyway) that the grid frequency
wandered
around a bit during this unusual load swing.-Joe
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