Get Ena Eg1-2006 Substation Earthing Guide - Saiglobal

An earthing mat is a grounding system formed by a grid of conductors buried horizontally and provides a low impedance path for the earth's fault current to dissipate into the earth. The earthing grid present in the substation is an electrical connection to the earth at zero potential reference point.

The Benefits of Proper Grounding Eliminates shock hazard. Protects equipment from voltage. Prevents electrical fires. Reduces equipment repair cost and downtime.

System earthing of low voltage installation is carried out to limit the potential of current carrying conductor forming part of the electrical system with respect to general mass of earth. The basic objective of system earthing is to ensure efficient and fast operation of protective device in the case of earth faults.

Earthing System in a Sub Station comprises of Earth Mat or Grid, Earth Electrode, Earthing Conductor and Earth Connectors. Primary requirement of Earthing is to have a low earth resistance. Substation involves many Earthings thro' individual Electrodes, which will have fairly high resistance.

The primary requirements of a good earthing system in a substation are: It stabilizes circuit potentials with respect to ground and limits the overall potential rise. It protects life and property from over voltage.

Earthing is primarily used to avoid electric shocks. Grounding is primarily used for unbalancing when the electric system overloads. Earthing is located under the earth pit, between the equipment body and the underground pit. It is located between the neutral of the equipment being used and the ground.

11kV Substations Full range of copperbond earth rods, couplings and driving studs are available for grid and primary substation earthing depending upon the calculated fault level. The potential on the surface of the soil near a copper earth rod during the time that fault current flows.