Novel apparatus and method accurately measure ground circuit impedance. A ground circuit and
electrical current source adjusted to 25 amperes or less simulate a ground fault.
Ground impedance is determined by dividing
voltage drop by amperage to determine impedance directly. In one aspect, impedance is determined and displayed automatically. Power wires of the circuit being measured serve as a means for transmitting
voltage and current data. The cable itself serves as a current-carrying and
voltage-transmitting conduit to determine directly the circuit impedance. The novel ground circuit impedance device and method measure impedance in underground mine power systems connecting to an outside electrical
power substation outside the mine and using portable transformers in the mine. The novel ground circuit impedance device and method also measure impedance in above-ground applications involving very long electrical
power circuits such as those used to supply power to long conveyors and other electrical
power equipment found in
Metal / Non-
Metal mines, including limestone quarries, sand and gravel operations, and other surface mines. In one aspect, ground circuit impedance is measured automatically in cables over 1
mile long.