Cast resin transformers don’t require a specific maintenance, anyway in order to ensure a longer life we recommend to monitor its functioning and properties.

We recommend to perform the following actions at least once per year:

  • Visual inspection of the various components and their status;
  • Cleaning of HV and LV windings and cooling ducts from dust with compressed air jets and dry cloths;
  • Dry the eventual condensation created nearby the transformer;
  • Check of proper HV and LV connections tightening in accordance with Tab.5 and Tab.6;
  • Check the correct functioning of thermal protection;
  • Check that the room is adequately ventilated.

All the operations above mentioned must be performed with the transformer disconnected and secured.After performing maintenance and before re-energizing the transformer, it is recommended to perform the checks shown in Tab.7.



If the transformer is subject to a discontinues operation and has long off load times all the operations described on point “4. COMMISSIONING” have to be performed again before first energization.

If the transformer has withstood exceptional events like, short circuits, atmospheric or operational over-voltages, overflowing or other exceptional events you are request to contact our technical department before to energize them once again. We recommend to send a mail to This e-mail address is being protected from spambots. You need JavaScript enabled to view it. describing the type of problem, the transformer’s serial number and technical characteristics and a photographic report of the same (including HV and LV connections and routing) or contact us at +39 0575 680701.