At what voltages are sub transmission lines energized?

The appropriate voltage range for sub-transmission lines is between 44 kV and 138 kV. Sub-transmission lines are part of the electrical grid that connect transmission lines to distribution systems, playing a critical role in delivering electricity over medium distances with fewer power losses compared to lower voltage distribution lines.

Voltage levels in sub-transmission are typically higher than those in distribution to efficiently transport electricity to substations that will further step down the voltage for end users. The chosen range reflects the general standards used in the industry for sub-transmission, ensuring stability and reliability within the power supply network.

Other voltage ranges provided do not accurately reflect the classification of sub-transmission lines: voltages below 44 kV are classified as distribution voltages, while voltages above 138 kV are categorized as high-voltage transmission lines. Thus, understanding these classifications helps clarify the characteristics and functions of different segments within the electrical grid.