Method of determining cable impedance
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United States of America Patent
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Jul 22, 2003
Grant Date -
Aug 22, 2002
app pub date -
Feb 13, 2002
filing date -
Feb 16, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of determining the impedance, inductance, and resistance of the network connecting an electrical power supply to an electric arc welding station including an electrode and a workpiece, wherein the method comprises: shorting the electrode to the workpiece; creating at least one waveform including a first state operating the power supply at constant current of a selected value and a second state operating the power supply at a low value of current or open circuit voltage whereby the current decays from the selected value along a decay path indicative of di/dt; obtaining the average current I.sub.avg and average resistance R.sub.avg during the first state; selecting a portion of the decay path; sampling the instantaneous current for a number of times on the path during the second state to read the rate of the decay; and, using the average current and the average resistance with the rate of decay to obtain the inductance of the network.
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