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gas insulated substation transformers maintenance

Gas Insulated System an Introduction of GIS - About Circuit· 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. The 4th and 5th generation SF6 systems have more than 25 years of the maintenance cycle. In modern gas insulated systems, we do not require any significant inspection before 25 years of its installation.

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