WHAT IS SUBSTATION.....

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SUBSTATION: A substation is a thing where high power comes to become short.
                          like - 22kV or 33kV to 3.3kV or 6.6kV. Below u would see this in the powerhouse.
                          
Figure 1. Typical substation


what is a lightning arrester?

A lightning arrester is a thing that grounds power if lightning falls on the substation.

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