Whats A Substation? Where I Work and How I got Here

A:Primary power lines' side B:Secondary power lines' side 1.Primary power lines 2.Ground wire 3.Overhead lines 4.Lightning arrester 5.Disconnect switch 6.Circuit breaker 7.Current transformer 8.Transformer for measurement of electric voltage 9.Main transformer 10.Control building 11.Security fence 12.Secondary power lines