Standard

IEEE C37.20.9A

Revised

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Abstract

This standard covers the design, testing, and installation of metal-enclosed switchgear that incorporates gas (typically SF6) at higher than ambient pressure as an insulation medium for alternating-current applications rated above 1 kV to 52 kV. The contents of the switchgear may include but are not limited to circuit breakers, switches, bushings, buses, instrument transformers, cable terminations, instrumentation, metering and controls, and protective relays. In a vertical section of the switchgear, some or all of the medium-voltage compartment(s) shall be composed of a gas pressure system for the primary insulating medium. This standard covers various partition classes of switchgear for both indoor and outdoor installations including isolated phase. This standard covers switchgear containing one or more phases.

Document information

  • Standard from IEEE_AC
  • Published:
  • Version: 0
  • Document type: IS
  • Additional information
    • IEEE Power and Energy Society