Question { 20204 }

which type of breaker sould be used for different level of
voltage ? (i.e at 11 Kv, 33 Kv, 66 Kv....

Answer

For LT: 415 V
Use ACB (Air blast Circuit Breaker)
For 11KV and 33KV:
Use VCB (Vaccum Circuit Breaker) or SF6 CB (Sulphar Hexa Floride Circuit Breaker).
For 66KV, 132KV and 220KV:
use SF6 Circuit Breaker or Oil Circuit Breaker

Question { 8236 }

what is difference between earhing and neutral

Answer

Earthing is grounding of any equipment i.e. connecting the body of any equipment to the earthing met or mash or to the earth pit. whenever there occurs any fault between the body and the circuit, faulted current flows to the ground through earthing. So earthing is mainly used for protection of the equipment as well as human being.
Where as
Neutral is the returning path of current which completes the circuit. if we connect an equipment to the phase only but keep the other end open without connecting the neutral then circuit is not complete. so equipment doesn't function. Once we connect with the neutral circuit is completed and hence equipment functions.