While the transformer is operating, dielectric fluids suffer strain and stress which cause long and medium term damages to their insulating and/or cooling properties. When this happens, breakdown risk increases.

S.T.&M.'s laboratory performs appropriate analysis to determine the state of these fluids and to make the recommendations, as preventive maintenance routine and as a demand of our clients.

First levels of deterioration correspond to the presence of gases, moisture and particles in fluids. In this case, the solution is filtering and desgasification. Besides, this process, performed in vacuum, also dehydrates dielectric fluids.

When deterioration resulting from fluid oxidation is more severe, it is necessary to recover the initial properties by regeneration, applying a Diatomaceous Earth-based treatment. All byproducts produced during oxidation adheres to Diatomaceous Earth filters by adsorption. The procedure is completed by similar reconditioning methods.

S.T.&M. performs both treatments on any power operating transformers, while they remain in service, so the impact on production processes is insignificant.