How does altitude affect a transformer?

Altitude can significantly impact a transformer's performance due to changes in air density and temperature. Higher altitudes result in lower air pressure and reduced cooling efficiency, which can lead to overheating if the transformer is not adequately rated for such conditions. Additionally, insulation properties may degrade at higher altitudes, increasing the risk of electrical breakdown. Therefore, Transformers installed in high-altitude locations often require special design considerations or derating to ensure reliable operation.