Power substations play a crucial role in:

The correct answer is: d) All of the above.

Power substations play a crucial role in the transmission and distribution of electricity. They step down the high voltage electricity from the transmission lines to a lower voltage that can be used by homes and businesses. They also monitor the power flow to ensure that it is flowing safely and efficiently. Additionally, they perform maintenance on the grid to keep it in good working order.

Here is a brief explanation of each option:

• Stepping down voltage for distribution: Power substations step down the high voltage electricity from the transmission lines to a lower voltage that can be used by homes and businesses. This is done using transformers.
• Monitoring power flow: Power substations monitor the power flow to ensure that it is flowing safely and efficiently. This is done using meters and other equipment.
• Maintenance of the grid: Power substations perform maintenance on the grid to keep it in good working order. This includes tasks such as repairing and replacing equipment, and clearing vegetation that could cause outages.

Power substations are an essential part of the electricity grid. They play a vital role in ensuring that we have a reliable and safe supply of electricity.