This illustrated glossary contains definitions, photos, and graphic illustrations of equipment used in a typical electric power generation, transmission and distribution system. For terms and concepts not equipment related see the glossary.

A typical power generation, transmission and distribution system has these components:

• Power Generation Plants

• Substations
  • Step-up Transmission Substation
  • Step-down Transmission Substation
  • Distribution Substation
  • Underground Distribution Substation
  • Substation Functions
  • Substation Equipment
     
• Transmission Lines
  • Overhead Transmission Lines
  • Subtransmission Lines
  • Underground Transmission Lines
     
• Distribution Systems
  • Industrial Customer
  • Commercial Customer
  • Residential Customer
  • Transportation Customer

Choose a component above or its image on the graphic to see details and definitions. For other system definitions, see the glossary.