On 9/1/12 6:56 AM, Arthur Dent wrote:
IMO, you have an instrumentation issue. I don't think the power grid can
do anything like that.
YMMV,
-John
I agree. If this was happening on the grid by the time this blip had
traveled down the line to you it would have been so filtered through
transformers and other devices and you wouldn't see sharp edges
on the waveform but see a slightly rounded distorted waveform, not
the sharp transitions you are seeing. If it isn't your test equipment
then it is still something local to you like a loose electrical connection
in your house momentarily causing your voltage to drop and then
it arcs to reconnect the power. If you use an AM radio (not use a
radio in the A.M. ;-) ), you could hear this as static or clicks as you
observe this waveform on the screen.
Do you have a triac/scr switch somewhere upstream? Like an X-10 module
or something? Or a remote power controller with a solid state relay?
That sharp edged, it's probably not coming from the utility.
I don't know.. do the new fancy electric meters have a remote control
disconnect feature in them? I could see that being some sort of SSR.
Or an automatic transfer switch or grid-tied inverter that periodically
interrupts the line, to detect backfeeding from the load?
Or a solar power installation with a grid-tie that's doing something
weird. On your neighbor's house? With a bug that shorts the line to
neutral for a millisecond, and it pulls your voltage down too.
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