For the grounding of an entire sub–station:
(1) Counterpoises are used
(2) Grounding rods are used
(3) Grounding mats are used
(4) Peterson coil is used
Answers
in electronics and radiocommunication at counterpoise is a network of suspended wires or cables used. as a substitute for an earth connection in a radio antennas system. it is used with radio transmitters or receivers. when a normal earth ground cannot be used because of high
soil resistance or other reasons.
A ground rod or a ground field's only purpose in life is to have a designed electrical path to dissipate a static discharge voltage (such as Lightning) to earth. If you place a current probe around the conductor going to earth or the ground rod itself you should never see any current flowing on the conductor.
Reduce your stress, improve your sleep - Elite athletes use earthing mats to enhance performance, and a grounding mat can improve yours too! Your body is somewhat conductive (with electrons carrying electrical energy from cell to cell) because it containslarge numbers of charged ions within blood and body fluids.
Peterson coil is an iron core reactor connected between transformer neutral and ground. It is used for limiting the capacitance earth fault current which is flowing when the line ground fault occurs in the line.