The main purpose of earthing system is to transfer high voltage surge or leakage current caused by any internal or external fault safely to ground in-order to protect life and connected machines. It mean generator, transformer and other machine are connected to earthing is for the safety of living beings and machines from high voltage surge or leakage current.
If there is a fault in an electrical system, a person can get electric shock if touch the live metallic part of the faulty system because electric current may use body as path from the live part of faulty structure to the earth. Earthing system transfer these faulty current to the earth proving low impedance path for the faulty current protecting the person from electric shock.
This fault current can also damage the various devices and machines connected to that faulty section of the system. Hence, earthing system also protects these devices and machines by transferring the fault current to the earth.
Conclusion
Hope, you have clearly understand what is the main purpose of earthing system. Make sure to leave your opinion and suggestion about this post in the comment section below.