All electrical networks rely on earthing systems to provide safe and efficient flow of electricity between the electrode and the ground. Earthing with high resistivity can lead to expensive network outages, equipment failure or faults that can damage assets and the environment.
Using Horizontal Directional Drilling (HDD) to install earth grounding systems has proven to be very effective with minimal disturbance to the surrounding environment. The method can be used for high voltage (HV) and low voltage (LV) systems including power poles, transformers, power stations and communication towers. It can also be used on Single Wire Earth Return (SWER), network upgrades, as well as high risk environmental sites or where ground resistivity levels are poor. By using this method, the earthing can be installed in the layer with the best resistivity by measuring and directing the drill string in real time. By substantially installing the conductor within these layers, electrical efficiencies can be promoted and impedance avoided with other conductors. This has advantages where ground conditions have poor resistivity levels and surface obstructions prevent open excavation. Once the target resistance is achieved, the drill rods are retracted and the electrode installed. The earthing can then be connected to the asset and energized.
By using horizontal directional drilling to install an earthing system, construction challenges can be solved by efficient installation within the geological layers of the Earth and increased resilience from changes in the weather or season. This has benefits for asset owners, business and the community.