Well, if the switch turns on when the AC is at a peak voltage,
the dV/dT will be VERY large. xC will be very low as a result.
Donald.
On 12/17/24 18:25, wn4isx via groups.io
wrote:
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Hum. Never considered that, I don't doubt you but will the
instanious current ever exceed the Xc?
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It feels like the maximum current can't exceed the Xc.....and
yea feelings are important but engineering is about science and
getting the math right backed up by real world experiments.
?
I just spent 30 minutes working the math several ways and
can't come up with a fast transient from 60Hz, time for real
world experiment.
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Sooo I could add the resistor, or, one of the two dozen 30A
zero crossing solid state relays I've been trying to come up
with a reson not to send them to recycle, or....
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I used a similar scheme with a #47 light bulb, AC mains in,
capacitor, #47 bulb, neutral, for at least a decade from 1960
until 1970 as a pilot light for a radio. I'll accept the
resistance and inductance of a #47 bulb is very different from a
string of LEDs.
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This is something interesting to test, I have a Tektronix
CT-1 current probe, bandwidth? 20kHz to 1GHz.
My scope has specs claimed to be good to 200, it will display
144MHz 2M signal with no obvious distortion.
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0.5uf, 60Hz has an Xc of? 5305ohms. I'll measure it two ways,
one direct AC hot to capacitor line through CT-1, to nuetral,
then AC to capacitor to 100 ohms wire through CT-1, to neutral
and see the max current peak on the scope.
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Ought to be interesting.
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And I'll use Teflon wire rated at 2kV for the pass through
wire through the CT-1.??