An electrical installation containing power conversion (and sometimes generation) equipment, such as transformers, compensators, and circuit breakers.
  A facility used for switching and/or changing or regulating the voltage of electricity. Service equipment, line transformer installations, or minor distribution or transmission equipment are not classified as substations.
  Facility equipment that switches, changes, or regulates electric voltage.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary
  A facility that steps up or steps down the voltage in utility power lines. Voltage is stepped up where power is sent through long-distance transmission lines. it is stepped down where the power is to enter local distribution lines.
  California Energy Comission. Dictionary of Energy Terms

Energy terms . 2014.

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