[time-nuts] Re: Power grid logging during the eclipse?

[tme at asteroidinitiatives.com]

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 at 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 at lists.febo.com>
>> Sent: Thursday, April 11, 2024 1:13 AM
>> To: Discussion of precise time and frequency measurement
>> <time-nuts at lists.febo.com>
>> Cc: Joseph B. Fitzgerald <jfitzgerald at 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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