Evaluation of the operational condition of a 150kV power transformer operating in the hellenic electricity distribution system

Power transformers are vital components of the electricity distribution networks, ensuring the efficient transmission and distribution of electricity across various voltage levels. These transformers, typically operating at high voltages such as 1 50kV, have a crucial function in ensuring the stability and reliability of the power grid. Effective maintenance of them is essential to prevent failures, extend their operational lifespan, and ensure uninterrupted power supply. This paper provides an overview of the critical maintenance practices of power transformers used in the Hellenic Distribution Network for monitoring and enhancing their performance. More specifically, this research has been applied to the 150kV/20kV power transformers installed at the Hellenic Electricity Distribution Network.