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Beyond which voltage level outdoor type switchgear is installed in a power system network?

Beyond which voltage level outdoor type switchgear is installed in a power system network? Correct Answer 66 kV

Classification of substation according to Constructional features:

Indoor Switchgear:

  • For voltages, up to 11 kV, the equipment of the sub-station is installed indoors because of economic considerations.
  • When the atmosphere is contaminated with impurities, this switchgear can be erected for voltages up to 66 kV.

Outdoor Switchgear:

  • For voltages beyond 66 kV, equipment is invariably installed outdoor.
  • It is because for such voltages, the clearances between conductors and the space required for switches, circuit breakers, and other equipment becomes so great that it is not economical to install the equipment indoors.

Underground Switchgear:

  • In thickly populated areas, the space available for equipment and building is limited and the cost of land is high.
  • Under such situations, the sub-station is created underground.

Pole-mounted Switchgear:

 This is an outdoor sub-station with equipment installed overhead on H-pole or 4-pole structure.

It is the cheapest form of sub-station for voltages not exceeding 11kV (or 33 kV in some cases). 

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