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Guidelines to replace older transformers before failure T RANSFORMERS PLAY CRITICAL roles in delivering power to distribution equipment for homes, commercial establishments, and industrial facilities. The sudden failure of a transformer can cause serious repercussions, leading to loss of power for a few minutes to hours. There are cases where an outage can last for weeks because of the system configuration, such as a simple radial system or the transformer was the single-point failure. In industrial complexes, an outage lasting for a few minutes could lead to loss opportunities as well as millions of dollars in lost production and start-up costs. Many older transformers have been in operation for more than 80 years without failure or major problems. There have been recent failures of units producing fires and explosions, resulting in the release of toxic and combustible gases as well as smoke into the