CLASSIFICATIONS OF SUBSTATIONS

CLASSIFICATIONS OF SUBSTATIONS:

Accordingly the substations are classified as

a) Generating substations called as step up substations  

b) Grid substations  

c) Switching stations  

d) Secondary substations.  

1 .The generating substations are step up stations as the generation voltage needs to be      stepped up to the primary transmission voltage so that huge blocks of power can be transmitted over long distances to load centers.  

2 .The grid substations are created at suitable load centers along the primary transmission lines.  

3 .Switching stations are provided in between lengthy primary transmission lines  

• To avoid switching surges.  

• For easy segregation of faulty zones.  

• For providing effective protection to the system in the A.C. network.  

• The switching stations also required wherever the EHT line are to be tapped and line to be extended to different load centers without any step down facility at the switching stations.  

• The number of outgoing lines will be more than the incoming lines, depending on the load points.

4. Secondary substations are located at actual load points along the secondary transmission lines where the voltage is further stepped down to sub transmission & primary distribution voltage.  

5. Distribution substations are created where the sub-transmission voltage and primary distribution voltage are stepped down to supply voltage and feed the actual consumers through a network of distribution and service lines.