[Science Form 3] Transmission & Distribution

• The electricity distribution system includes:
  
  
  • National Grid Network, which carries electricity to the main substation
    
    • Consists of a network of cables that carries electricity with a voltage of 66kV, 132kV or 275kV
    • It connects all the power stations in our country.
      
      
  • Transformer station
    
    
  • Switch zone, which is located in various places
    
    • It is equipped with circuit breakers to automatically cut off the circuit if a short circuit occurs.
      
      
  • Main substation, where voltage is lowered by a step-down transformer to 33kV
    
    • This high voltage is supplied to heavy industries like vehicle manufacturing factories.
      
      
  • Substation branches, where voltage is lowered by a step-down transformer to 11kV
    
    • This is supplied to light industries like electronic factories.
      
      
  • The voltage to housing estates is 240V.