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Gas Insulated System an Introduction of GIS - About Circuit· Operating Lifespan of Gas Insulated System. The lifespan of gas insulated systems is quite long. It is more than 50 years. Its reliability is much more than the lifespan of AIS. AIS means Air Insulated System. The maintenance cycle of 1st-generation GIS was of 5 years. The 2nd-generation and 3rd-generation GIS have ten years maintenance cycle.

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