This guide describes methodologies for determination of the steady-state winding hottest-spot temperature in dry-type distribution and power transformers with ventilated, sealed, solid cast, and encapsulated windings built in accordance with IEEE Std C57.12.01-1998 and IEC 60726 (1982-01). Converter transformers are not included in this guide.
IEEE C57.134-2000
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IEEE Guide for Determination of Hottest-Spot Temperature in Dry-Type Transformers