Successful power transmission and distribution require a sound and extensive knowledge of condition assessment, testing, and maintenance of HV power transformers. The breakdown of transformer insulation and terminations under various stresses and insulation ageing effects has become a nerve-racking problem for the electricity-supply industry. In critical situations, the failure of a transformer can cause millions of dollars in damage to equipment owned by consumers and/or the utility. It is, therefore, vital to assess the condition of transformers accurately before commissioning and during operation.
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