High Voltage Services

Earthing and Earth Grid Testing


Earthing is an integral component of any power system. Substations, generating stations and transmission lines all require adequate earthing to ensure protection from power system earth faults.

The design and testing of earth grid systems is necessary to ensure compliance with safety regulations and to ensure public safety. There are a number of reasons as to why degradation to an earthing system would occur and the RANS High Voltage Electricians will use state of the art equipment to determine if there are any faults in accordance with the Australian standards.

Our Services

  • Step & Touch Potentials
  • Earth Potential Rise (EPR)
  • Field Soil Resistivity Testing using Wenner Method
  • Soil Resistivity Modelling
  • Earth Continuity Test
  • Off Frequency Current Injection Test
  • Current Distribution Test
  • Fall of Potential Contours Test
  • Earth Grid Testing

Earth Testing

The ground resistance test set is capable of ground resistance with two clamps, bond/connection resistance, ground resistance, selective ground resistance and soil resistivity.

We are able to make accurate measurements under difficult conditions as it uses the alternating current potentiometer method to provide measurement accuracy, and because it contains features such as an auxiliary grounding resistance check feature and measurement frequency switching.

Case Study

Earth Injection Testing – This testing is required before any substations can be used. It is a requirement because of the high hazard electricity can pose to people and equipment. Earth Injection Testing is a test of the earthing system and conducted to measure the risk of Earth Potential Rise (EPR) where a large current flows to earth through an earth grid impedance.

Renewable Futures wanted to bring their new substations online. Before they could do so, they were required to prove their earthing system. RANS Electrical provided Earth Injection Testing to measure step/touch voltages and EPR voltages to verify the HV Earthing Study.

RANS Electrical conducted injection tests at three separate sites, as the three were a large distance apart. Earth Potential Rise tests were performed individually at each site as well as step/touch voltage testing and then compared, so that Renewable Futures would have peace of mind that their new substations were safe.

RANS Electrical were happy to confirm that the earthing system installed met the criteria of the HV Earthing study and gave Renewable Futures a pass on every test conducted. Renewable Futures could therefore have the power to their substations turned on.


Ground Resistance Tester


Hoiki Earth Tester

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