A Gas Insulated Substation (GIS) is a compact, high-voltage power substation where major components like circuit breakers, isolators, and busbars are enclosed in a sealed environment filled with SF6 (sulfur hexafluoride) gas. This design ensures efficient insulation, arc quenching, and protection from environmental conditions.
| Rated Voltage | 72.5 to 245kV |
| Rated Current | Upto 4000A |
| Frequency | 50/60 Hz |
| short-circuit breaking current | Upto 50kA |
| Lightning impulse withstand level-LIWL | upto 1050 kVp |
| Peak Withstand Current | Upto 125 kAp |
| Insulation Medium | SF6 gas |
| Fault Current Capacity | Upto 63 kA |
| Design Type | Modular design for flexible configurations |
| Space Efficiency | Requires up to 70% less space than AIS (Air Insulated Substations) |
| Operating Environment | Suitable for indoor and outdoor installations |
| Standards | Conforms to IEC 62271-203 and IEEE C37.122 |
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