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Current Limiting and Impedence
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- Subject: Current Limiting and Impedence
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- Date: Thu, 21 Apr 2005 10:07:54 -0600
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Original poster: "Mark Dunn" <mdunn@xxxxxxxxxxxx>
Please follow my math and explain my confusion.
My TC power transformers have an impedence Z = 1.2 Ohms(secondary
I built a Current Limiting Inductor(CLI) with L = 15 mH, thus at 60Hz
X = 2*Pi*60*.015 = 5.65 Ohms. The R for the CLI is negligible. So the
inductor Z = 5.65 Ohms. The system therefore has total impedence of Z =
5.65 + 1.2 = 6.85 Ohms.
This limits current to 120 VAC/6.85 Ohms = 17.5 amps.
I have confirmed this through testing.
Measuring voltage BETWEEN the inductor and transformer I get around 90
to 100 volts(Mains 120V). So if I break down the circuit and consider
the current the individual components...
Transformer I = 90 VAC /1.2 ohms = 75 amps
CLI I = 30 VAC /5.65 Ohms = 5.3 amps
Obviously, one can't analyze the components this way. Is it because the
voltage measurements are not accurate due to the phase angle? Am I not
allowed to analyze individual component impedence? What don't I