SF 6 gas-insulated metal-enclosed substation: AIS is the most common type of substation, accounting for more than 70% of substations all over the world.AIS is fully composed of air-insulated technology components such as circuit breakers, disconnecting switches (disconnectors), surge arrestors, instrument transformers, power transformers, capacitors, bus bars, and so on, and the components are connected to each other by stranded flexible conductors, tubes, or buried power cables.An air-insulated substation (AIS) is one where the main circuit potential is insulated from the ground by air using porcelain or composite insulators and/or bushings.These are also known as 66kV substations, 132kV substations, 220kV substations, and 400kV substations, etc.The outdoor substations are constructed in the open air. Conventional outdoor substations, SF6 gas-insulated metal-enclosed substations and Hybrid substations are suitable for voltage 66 kV and above.Ĭonventional Outdoor type with air-insulated equipment:
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