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Breaking It Down

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When budgetary concerns push back maintenance schedules, one has to break down the maintenance tasks into those that have the most immediate value and those that can be put off with reasonable risk tolerance. This is where experience and knowledge come together to make the best decisions. For example, knowledge of oil filled power transformers alone will not provide confident risk assessment. Nor will experience alone. Experience tells you what will happen in the real world. Knowledge tells you what can happen in the engineering world. And experience and knowledge must work together to determine the system consequences of each risk. In the industrial world, for oil filled electrical power transformers, the most effective tools are transformer gas analyses, dielectric fluid analyses, and frequent hard focused inspection of the transformers and gauges. Except for pad mount transformers, all these services are typically safe for qualified personnel without de-energizing the transformers. Services that require an outage get expensive. If an outage is not possible due to cost, increasing the frequency of the other services may be an alternative. Frequent inspection by a qualified person is very inexpensive risk reduction.

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