Air Insulated Substation (AIS) or Outdoor Substations have all switchgear equipment, busbars and other switchyard equipment installed outside open to atmosphere. In earlier days for any voltage ratings AIS or outdoor substation is employed.
Indoor Substation type is only employed in places where high pollution or saline environment exists. Indoor substations are of two types
Because of excellent properties of SF6 gas such as high dielectric strength, high electronegativity, for EHV substations more than 230kV now a days Indoor Gas Insulated Substations (GIS) are employed in place of AIS substations. However the cost of GIS indoor substation is higher compared to AIS substation but it has some benefits which includes high reliability, less space requirement and less maintenance. Some of the advantages and disadvantages of outdoor switchyard is discussed below.
Advantages of Outdoor Substation (AIS):
Disadvantages of Air Insulated Substation (AIS):
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