Transformer Health Assessment
Generally, the transformer has a life expectancy of 30 years or more. However, sometimes the power/Distribution transformer failure may occur faster because of degradation under the combination of thermal, electrical, chemical, mechanical and environmental stresses. While the transformer is operating, it is experiencing things that accelerate ageing, such as water content, temperature and oxidation. Therefore, transformer health assessment has to be done periodically to anticipate the sudden failure of active parts.
Transformer insulation failure can be caused by several factors, some of them are fault factor, oil quality factor, and paper condition factor. Those three factors have a major effect on the transformer insulation system.
The healthiness of transformer insulation and its accessories are to be checked/ tested periodically to avoid sudden failure.