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