What do sub transmission lines typically operate at?

Sub transmission lines typically operate at medium voltage levels. These lines serve as an intermediary between the high voltage transmission network and the lower voltage distribution network. Their primary function is to transport electricity over shorter distances from substations to distribution points. Operating at medium voltages allows these lines to efficiently deliver power while minimizing losses and ensuring safe and manageable voltage levels for further distribution to end users.

In contrast, high voltage lines are used for long-distance transmission to minimize losses over large distances, while lower voltage and ultralow voltage options refer to levels that are mainly for local distribution and do not adequately serve the purpose of sub transmission.