Patent ID: 7714592

Claim:
A method of determining an impedance of a medium voltage power line having a finite characteristic impedance, comprising: determining a first voltage comprising the voltage of the power line at a first location at a first time; determining a second voltage comprising the voltage of the power line at a second location at the first time; determining a first current comprising the current flowing between the first location and the second location of the power line at the first time; determining a third voltage comprising the voltage of the power line at the first location at a second time; determining a fourth voltage comprising the voltage of the power line at the second location at the second time; determining a second current comprising the current flowing between the first location and the second location of the power line at the second time; determining a first voltage change comprising the difference between the first voltage and the third voltage; determining a second voltage change comprising the difference between the second voltage and the fourth voltage; determining a current change comprising the difference between the first current and the second current; determining the impedance by dividing the difference between the first voltage change and the second voltage change by the current change; and outputting data of the determined impedance.