This revision will include the addition of reference to NEMA Std ST-20 definitions and terminology. Major change in partial discharge requirements, change in testing requirements of tables 3A and 3B, additional information on flame retardation seismic cautions and minimum temperature for cast resin transformers.
IEEE C57.12.01-2005
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Standard General Requirements for Dry-Type Distribution and Power Transformers Including Those with Solid Cast and/or Resin Encapsulated Windings