This standard specifies the allowable value of energy efficiency, target allowable value of energy efficiency, evaluation value of energy saving, energy efficiency grade and test method for power transformers. This standard applies to three-phase oil-immersed power transformers with a rated frequency of 50Hz, a voltage level of 35kV~220kV, and a rated capacity of 3150kV•A and above. This standard does not apply to dry-type transformers, high-impedance transformers and gas-filled transformers.
GB/T 2900.15-1997 Electrotechnical terminology. Transformer, instrument transformer, voltage regulator and reactor
GB/T 6451-2008 Specification and technical requirements for oil-immersed power transformers
GB 24790-2009 history
2020GB 20052-2020 Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers
2009GB 24790-2009 Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers
GB 24790-2009 Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers was changed to GB 20052-2020 Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers.