In non-hermetically sealed oil-insulated MV switchgear the insulating oil will adopt the relative humidity of the ambient air within a limited period of time (weeks). This requires a different approach for maintenance and requires additional procedures for operating the switchgear. For this situation, determining the oil quality is only feasible when oil temperature and water content are standardised to values in the testing room. Otherwise the oil analysis results may merely indicate the properties of saturated oil. Further due to condensation oil-insulated MV switchgear may even suffer from an internal fault (explosion) if the oil temperature drops significantly within several hours.
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