
Power transformers are the unsung heroes of our electrical infrastructure, silently powering our lives. However, behind their steadfast service lies a crucial battle against the elements: oxygen and moisture. In a recent technical article written by Senja Leivo, the Senior Industry Expert at Vaisala, the intricacies of transformer aging and the vital role of insulation systems are brought to light.
Leivo emphasizes that the aging of power transformers is not merely a consequence of time but is heavily influenced by environmental factors and operational conditions. The combination of water, oxygen, and acids within the solid insulation can accelerate the aging process, diminishing the transformer's mechanical strength and shortening its lifespan.
One of the primary challenges faced in maintaining transformer integrity is the intrusion of oxygen and moisture from ambient air. While modern transformers boast sealed designs and preservation systems, such as nitrogen blanketing, ensuring their airtightness remains a pressing concern for asset managers. Leaks, often caused by deteriorating seals, can compromise the insulation system, leading to inefficiencies and potential failures.
Traditional methods of detecting air leaks, such as dissolved gas analysis (DGA), have limitations, including the risk of sample contamination and the need for specialized interpretation. However, Leivo introduces a promising solution: measuring the total gas pressure (TGP) dissolved in oil. This method offers a straightforward means of identifying air ingress, providing valuable insights for maintenance teams to plan timely interventions.
In conclusion, the battle against aging transformers underscores the importance of proactive maintenance strategies. By understanding the impact of oxygen and moisture on insulation systems and adopting innovative monitoring techniques like TGP measurement, utilities can prolong the lifespan of their transformers and ensure reliable power supply for years.
Read the full article to learn more about detection of air leaks and it's role in maintaining transformer integrity.