Sturdy but sensitive to heat: the impact of a winding temperature on power transformer reliability

This paper provides some useful information on insulation temperature in order to take full advantage of transformer loading capabilities during emergency conditions without jeopardizing the reliability of the unit. Particular focus is given to the impact of a winding temperature indicator (WTI) on power transformer reliability. The WTI is a critical device on a transformer because it not only controls the transformer cooling, but it also provides the transformer with thermal protection.