Measuring the earth resistance of a transmission tower
At a glance
To measure the current in each of the four legs of a transmission tower to determine the total current to earth so that the earth resistance can be determined.
We injected a voltage from a power supply. We configured a Rogowski coil measuring system so that four current measurements could be summed algebraically giving the total current and this enabled the resistance to earth to be calculated. The earth resistance measurement was made at several frequencies.