• Sampling of oil, and even more so of papers, must be carried out by qualified operators according to protocols and procedures
  • laboratory analyses must be carried out using methods set by reference standards, as guaranteed by accredited laboratories
  • actions to prevent the “Insoluble deposits (sludge)” criticality, namely oil depolarisation treatments and internal transformer inspections must be carried out
    • using technologies that are safe and fit to meet the requirements of BAT and BEP
    • using staff with specific skills and training
    • relying on operators able to demonstrate an extensive application case history and able to certify interventions carried out with quality