Method for the evaluation and classification of power transformer insulating oil based on physicochemical analyses

Power transformers are strategically important assets in the electric power system, because they enable electricity to be transmitted over long distances, with low power losses and voltage drops. Failures of these devices can cause unscheduled interruptions in the supply of electricity, resulting in major disruptions, impaired image of the companies responsible, including penalties imposed by the regulatory agency, and in worst case scenarios, irreparable breakdown of these assets. In this context, the degradation of the insulation system in a power transformer is one of the main causes of problems, which if not properly investigated and/or monitored, can lead to its forced removal from operation [1].