Testing of the power transmission towers grounding (G) quality poses a serious problem as they are all electrically interconnected by means of Ground Wires which act as lightning rods, protecting the lines from atmospheric discharges.
Due to the existence of this connection, any attempt to measure a tower ground (G) resistance using a conventional earth meter leads to wrong results as what is really being measured is all the shunt towers ground (G) resistance (or, more precisely, its impedance at low frequency). Trying to disconnect the ground wire from an energized line is a risky operation due to the need for climbing to the tower highest part as well as for the proximity to the high-voltage conductors.
To make this kind of test feasible, which is of vital importance to ensure the transmission of the electrical power without interruptions, TM-25m ground resistance meter for high frequency has been developed. This is the appropriate tool for a fast, safe and reliable grounding resistance measurement in each tower of a working line transmission, without disconnecting the ground wire.
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