Correct Answer - Option 1 : interconnected ground grid
Methods of grounding:
Earthing is the process used to transfer the discharge of electricity to the earth’s plate so that we can avoid electric shocks.
Counterpoise wire:
Counterpoise Earthing has four wires, each of them has a connection to the tower at one end, and kept away from the tower but embedded below a ground level around 600 mm, to reduce the resistance.
To maintaining the low resistance, the length of the wires can be increased.
Galvanizes steel wires are used for the Counterpoise Earthing
In some areas of high sensitivity soil such as rocky locations, Earthing is used in the form of counterpoise earthing to bring down the resistance.
Rod gap:
This is the simplest form of a surge diverter consists of two rods with ends facing each other.
These are usually connected across the bushings of the various equipment.
Rod gaps are liable to be damaged due to the high temperature of the arc which may cause rods to melt. So, for higher voltages these are not applicable.
Interconnected ground grid:
An interconnected copper grounding grid is placed underneath the high voltage substation and Power plants.
The purpose of the grounding grid is to serve the dual purpose of carrying currents into the earth without exceeding the operating tolerances of any protected equipment while assuring that personnel in the vicinity are not exposed to electric shock.
