Utilities in North America face the continuous growing demand for power from customers and focus their efforts on providing efficient, secure and reliable energy supply to the entire industrial, commercial and domestic population. Power and distribution transformers-maybe the most important components of the energy system-are affected by the normal and unidirectional aging process. Due to load demand, fewer opportunities arise to take transformers out of service for routine testing and/or maintenance. Therefore, the risk of failure must be minimized by applying technical methods capable to reduce time and materials spent during the testing and maintenance of high voltage apparatus.
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