Basics of Earthing in Electrical Power System

WHAT IS EARTHING 

• Earthing is nothing but a connecting specific part of installation to earth conductive surface.

  Choice of earthing system can affect the safety and EMC (electromagnetic compatibility) of the system.
• The objective of earthing is to ensure the safety from the shock and fire hazard arising out of leakage currents.
• The purpose of earthing is to protect the electrical system from the rise in voltage due to lightning, breakage between winding, etc.

WHAT IS TO BE EARTHED?

1.       The neutral of one side of the transformer of three-phase

2. The neutral of 3 phase, 4 wire system

3.The middle conductor of 2 phase,3-wire system

4.One of each 2-wire secondary transformer

5.LA earth terminals

6.One side of CT and PT secondary winding

6.All non-current carrying metallic part of generator, transformers etc.