IEEE C57.12.12-1980 - IEEE Guide for Installation of Oil-Immersed EHV Transformers 345 kV and Above
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Large, oil-immersed power transformers with high-voltage windings rated 345 kV and above are considered. Inspection on receipt, internal inspection at the site, preliminary oil filling, assembly, vacuum treatment and final filling, vacuum drying of insulation, recirculation, and energization are covered.
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