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How often do distribution transformers experience an internal fault?

April 26, 2017distribution experience fault Internal transformers

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How often do distribution transformers experience an internal fault?

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From one large utility study, between 2% and 5% of the total pole type distribution transformers are re-energized every year, which equates to approximately 20,000 re-energizing / year. Of this, 4,500 (or about 20%) have internal faults. More than 5% of those has violent tank explosions.