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How effective is drying the power cable with nitrogen purging? Can it confirm life of the cable Same as new cable after this process of drying ? How many years it may take to form form electrical tree and breakdown the insulation if moisture is retained within the insulation?

In one of my 10km long , 400kV Lead sheathed XLPE insulated Power Cable installation project, contractor had completed few cable joints up to copper casing but he could not provide final water proofing compound and coffin box since supply of the same was awaited. During this stage there was...