Definition of substation, need of substation and types of substation

In this video, we will discuss the definition of the substation, need of substation, and type/classification of substation.
Substation: A substation may be defined as “assembly of apparatus which transfers characteristics of electrical energy from one to another for example from alternating current to direct current or from one to another.”
Type/classification of substation:
1) According to nature of duties
2) According to service requirement
3) Classification of Substations on the Basis of Operating Voltage
4) Classification of Substations on the Basis of Importance
5) According to constructional features/Design