Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
?
? asked in Science & MathematicsEngineering · 1 year ago

Are  DC switch gear systems  used all over the world particularly for controls in substations or there are AC systems also?Why DC is used?

3 Answers

Relevance
  • Philomel
    Lv 7
    1 year ago

    Many control systems are low voltage DC for safety. They are easier to maintain and the repair people do not need to be licensed.

  • oil field trash
    Lv 7
    1 year ago

    It is strictly a matter of what the facility is and what its requirements are. 

  • billrussell42
    Lv 7
    1 year ago

    DC switch gear systems are used only when high voltage DC has to be switched. HVDC is very high, in the MV and is used only to carry power long distances. Substations and lower voltage systems are all AC, so AC switch systems are used. 

    Unless you mean switch gear systems with DC control voltages? 

Still have questions? Get your answers by asking now.