210124-2045 EST
Here we have another thread where the original poster starts something and then disappears.
I have some more information that curious101 needs to consider.
At my website I have several plots that relate to this general subject. Data was obtained with a TED 1000 power and energy monitor.
The data was obtained at my home, measured and collected over day like time periods, and plotted such that 1 second sample periods would show even on a 24 hour plot.
The portion of my website of importance is at
http://beta-a2.com/EE-photos.html .
As I stated the time resolution is 1 second. This is determined by the averaging time of the TED 1000.
Most measurements were made at my main panel. Voltage is measured by TED from one 120 V phase. Two current transformers are used, but their outputs are summed so there is also only one current. The TED 1000 thus provides information on total power input to the home. Energy is measured over some time period by summation of of individual 1 second average power measurements. TED does use multiplication to determine power. This is quite good but does degrade at low power factors because of current transformer phase shift. The Kill-A-Watt EZ does a better job with respect to low power factor, but does not have other capability that TED 1000 has.
On my plots I have two curves, voltage and power, both based on the same time base. When looking at 1 second periods one of the plots has to be shifted by 1 second so that they align.
AT plot P26 you see a total change in voltage of about 1.5 over a 24 hour period with no spikes. The corresponding power plot shows a very much greater percentage variation, and many very sharp spikes. These spikes are motors starting. During this time period I primarily had two freezers, one refrigerator and freezer, and two furnace blowers as sources of the power spikes.
At P27 over a 4 hour period from P26 you can more easily see the lack of voltage change from the power load spikes.
At P28 is daily data for an almost 2 month period.
My pole transformer is a single phase center tapped secondary. I believe at the time of this data, 2011, that the transformer was close to my home and a 25 kVA unit. Service lines were about 50 ft long and large. Now I have a 50 kVA transformer with an additional 80 ft or so of wimpy wires.
In plots P29 and P30 I moved the TED to the far end of my garage at the input to a freezer. About 100 feet or so from the main panel. There are a variety of wire sizes and several breakers to get here.
In these plots you see considerable variation in supply voltage at the freezer from the impedance of the supply to this point. Note; the approximate 5 V drop on motor starting. This would cause considerable flicker of an incandescent or most LEDs if plugged in at this same destination. Notice how large the motor starting power spikes are compared to running power. All how power droops over time.
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- who are you going to believe, the customer or your own eyes? (These forums have heaps of threads about what the customer said vs what was really there.)
