This standard is a supplement and improvement to GB20052-2013 "Energy Efficiency Limits and Energy Efficiency Levels of Three-Phase Distribution Transformers". It supplements and adds 6kV ~ 35kV single-phase, three-phase oil-immersed, dry-type distribution and power transformers (hereinafter (referred to as transformer) energy efficiency limit value, energy efficiency grade, energy saving evaluation value and test method.
T/CEEIA 258-2016 history
2016T/CEEIA 258-2016 Minimum allowable values of energy efficiency and energy efficiency grades for 6kV~35kV transformers