Grounding Material Supplier in Saudi Arab Mlelecmech,
Earthing material supplier in Saudi Arab
What Is Grounding Or Earthing in Substation?
Earthing of a circuit can be defined as physically connecting the circuit with the ground, which has zero-volt potential to the ground (the earth). Grounding of a circuit is holding a circuit to a zero-volt potential but not physically connecting it to the ground. The substation grounding system connects all the equipment, lightning mats, overhead ground wires, surge arresters, and all the metallic structures present in the substation like a network and holds them at the zero-volt potential.
Need For Substation Grounding
The major requirements of earthing for a substation are to ensure the safety of the people working in the environment, protection of the equipment in the substation and operational security of the substation. Different requirements that are to be considered for a safe earthing system is:
– Avoiding fatal electric shocks to employees working in the area of earthed facilities during a fault in the power system.
– The currents occurring during normal and fault conditions must be taking a low impedance path.
– Ground faults must be cleared by improving the operation of the protective relay scheme.
– The reliability of the electric power system must be enhanced.
For calculating the earthing design parameters and the shock potential safety limits, a large variety of national and international standards across the globe are followed, which include:
– BS7354 -1990 Code of practice for Design of High Voltage Open Terminal Stations.
– EATS 41-24- Guidelines for the design, installation, testing, and maintenance of main earthing stations in substations.
– IEEE Standard 80-2000- Guidelines for AC substation grounding.
In a substation, all the exposed metal parts, metallic structures, generators, transformers, switchboards, circuit breakers, switches, instrument transformers, lightning arresters, surge arresters, conductors, and reactors are to be grounded using any of the above earthing guidelines so that there would be a proper grounding and there would not be any shock even when there is a fault. For example, a typical substation earthing grid for a 66KV substation is shown below.
They can be made of galvanized iron or copper in saudi arab. Ground (Auxiliary) Electrode: It is a conductor embedded in the earth and is used for collecting ground current from the earth or dissipating fault current into it. Ground mat: It is a solid metallic plate or a system of closely spaced bare conductors.