Prevention

Since there is no real treatment for this criticality, prevention is the only viable strategy for correct life cycle management of the bushing and the transformer to which it is connected.

• Monitoring symptomatic indicators (see symptoms above). If the first symptoms of criticality, such as a high SF6 content in oil, occur, increasing sampling and analysis frequencies (once a week or even once a day) in order to monitor their trends is recommended. This monitoring aims to establish the right time to justify decommissioning the transformer and replacing the accessory with a suitable spare part.
• In addition to regular visual inspections, consider carrying out thermographic surveys to establish the general conditions of the accessory, identify any defects in the connections or phases, and identify any defects in the cooling system
• Consider the performance of electrical tests to determine any isolation losses, partial discharges, capacities, delta Tg.
• delta Tg.It is recommended that strategic information be updated through a “dynamic inventory” of oils and transformers (with their accessories), without neglecting the values ??of symptomatic markers.
• It is recommended that maintenance and procurement practices be modifed/integrated in such a way as to ensure that the warehouse always has sufficient spare parts (of insulators) for each family/manufacturer