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See Chinese contents: GB 20052-2020 GB 20052-2020: Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers
This Standard specifies the minimum allowable values of energy efficiency, the energy efficiency grades and the test methods for three phase power transformers. This Standard is applicable to oil-immersed distribution transformers with three-phase 10 kV voltage level, non-excitation tap-changing, and rated capacity of 30 kVA ~ 2500 kVA, dry-type distribution transformers with a rated capacity of 30 kVA ~ 2500 kVA, and three-phase oil-immersed power transformers with a rated frequency of 50 Hz, a voltage level of 35 kV ~ 500 kV, and a rated capacity of 3150 kVA and above. This Standard does not apply to gas-filled transformers and high-impedance transformers.
