What are the major components of a transmission and distribution system?

• A. Generators, transformers, converters
• B. Substations, switchyards, transmission lines, and distribution lines
• C. Wires, meters
• D. None of the above

Answer: (B)

Power is moved from generation to customers through four main pieces of the system: substations, switchyards, transmission lines, and distribution lines. Substations house transformers and switching gear that change voltage levels and route power while protecting the system. Switchyards are the large-node points where major circuits are interconnected and paths are selected or diverted as needed. Transmission lines carry high-voltage power over long distances from generation sites toward load centers. Distribution lines carry the power from substations to customers at lower voltages. While generators and converters exist in generation, and wires and meters are components used within the system, the major structure of transmission and distribution centers on these four elements.