There are organic materials in a transformer that decompose over time. Decomposition is accelerated by temperature and the presence of moisture, oxygen, acids and other contaminants. Transformer oil can be tested to determine whether a transformer is aging too rapidly, and the oil can be upgraded to help maximize the transformer`s lifetime. Also, cooling systems and seals may not last 30+ years, but maintenance will go a long way to maximizing a transformer`s operational life. Design, manufacturing process and materials used (particularly solid insulation) make a difference, as about 80 percent of all transformer failures have roots there.
Large and medium power transformers
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