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*To*: tesla@xxxxxxxxxx*Subject*: Current Limiting and Impedence*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Thu, 21 Apr 2005 10:07:54 -0600*Delivered-to*: testla@pupman.com*Delivered-to*: tesla@pupman.com*Old-return-path*: <teslalist@twfpowerelectronics.com>*Resent-date*: Thu, 21 Apr 2005 10:24:18 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <PQLBJD.A.rRB.wO9ZCB@poodle>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: "Mark Dunn" <mdunn@xxxxxxxxxxxx>

All:

Please follow my math and explain my confusion.

My TC power transformers have an impedence Z = 1.2 Ohms(secondary shorted).

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 understand.

Mark

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