Transmission lines usually terminate in voltage changing stations normally called what?

• A. Substations
• B. Switchyards
• C. Converter Stations
• D. Transfer Stations

Answer: (A)

The concept here is where high-voltage lines meet equipment that changes voltage levels and controls power flow. A substation is the facility that does this: it houses transformers to raise or lower voltage for efficient transmission and distribution, along with switching gear and protection to route and manage the power. This is what’s meant by a voltage-changing station for transmission lines.

Converter stations are specific to HVDC systems, not generic AC transmission end points. A switchyard is the outdoor switching portion and is typically part of a substation rather than the term used for the whole facility. Transfer stations aren’t standard terminology for this function.