What voltage range do subtransmission substations generate?

Subtransmission substations primarily operate within the voltage range of 34.5 kV to 69 kV. This range is designed to effectively deliver electrical power from transmission lines to distribution networks. Subtransmission levels serve as an intermediary, allowing for efficient power distribution over medium distances without the losses that occur at lower voltages.

This voltage range is crucial for reducing transmission losses while still being accessible for local distribution systems. It sets the stage for lower voltage distribution, typically below 34.5 kV, making the distribution system more manageable and suitable for end-use applications.

The other choices either represent voltages that are not typical for subtransmission substations or fall below the expected operational range. For example, lower voltage ranges like 13.2 kV - 24 kV are more typical for distribution systems rather than the subtransmission levels. Meanwhile, the higher voltage ranges like 120 kV - 250 kV and 500 V - 3000 V pertain to different segments of the power delivery system, such as high voltage transmission lines or specialized applications, respectively.