Air Insulated Switch-gear VS Gas Insulated Switch-gear

Air Insulated Switch-gear VS Gas Insulated Switch-gear

Gas Insulated Switch-Gear
Air Insulated Switch-Gear

Limitations of Air Insulated Switchgears (AISs)

  • Large dimensions due to statutory clearances & poor dielectric strength of air
  • Insulation deterioration with ambient conditions and susceptibility to pollutants
  • Wastage of space above
  • Life of steel structures
  • Seismic instability
  • Large planning and execution time
  • Grounding-mat is essential for containing touch and step potentials
  • Hot line washing and regular maintenance of the substation is essential, requires more spares inventory and man-power

Advantages of GISs over AISs

  • Compact space-saving design
  • Minimal operating cost
  • Minimal weight by lightweight construction
  • Safe encapsulation
  • Environmental compatibility
  • Economical transport
  • Reliability
  • Smooth and efficient installation and commissioning








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