Key maintenance activities include monitoring oil temperature, oil level, and load current. Periodic oil testing provides valuable insights into transformer health. Parameters such as moisture content, dielectric strength, and dissolved gas composition help identify early-stage. Whether construction or maintenance of electrical equipment is concerned, we reliably meet our customers' needs with professional skill. We are an expert partner for industry in the design, construction and maintenance of distribution substations and power stations, among others. The lifecycle services include preventive maintenance, servicing and expert services, ensuring reliability, safety and cost effectiveness throughout the entire. Finn Electric Oy provides solutions for power distribution, protection, and smart energy management. Like the other parts of a building, electrical systems do not remain safe and in working order by themselves. If the appointed supervisor of electrical work holds a valid qualification from another EU country, SETI can typically issue. Thesis for the degree of Doctor of Science (Technology) to be presented with due permission for public examination and criticism in the Auditorium of the Mikkeli University Consortium, Mikkeli, Finland on the 23rd of November, 2012, at noon.