Question

Which of the following components of the electric power transmission does not step down the transmitting voltage?

• A. Main sub-station
• B. City sub-station
• C. Grid sub-station
• D. Electric pole

Answer 1

Answer: (C), (D)

Electric pole

Out of all the sub-stations involved in the power transmission from the power-plant, only the grid sub-station steps up the incoming voltage from $11\text{kV}$ to $132\text{kV}$ before transmitting it over to the main sub-station.

The reason for this is to avoid high power losses due to the low transmitting voltage. Transmitting the power at a high voltage reduces the risk of heavy currents too.

And, the electric pole that connects the household to the city sub-station also does not step up or step down the transmitting electric power.