GB 20052-2024 Energy efficiency limit values ​​and energy efficiency grades for power transformers

This policy is applicable to oil-immersed distribution transformers and dry-type distribution transformers with three-phase 10 kV voltage level, non-excitation voltage regulation, rated frequency of 50 Hz and rated capacity of 30 kVA ~ 2,500 kVA; oil-immersed power transformers with 35 kV ~ 500 kV voltage level, rated frequency of 50 Hz and rated capacity of 3,150 kVA and above; oil-immersed transformers and dry-type transformers with three-phase 6 kV ~ 35 kV voltage level, non-excitation voltage regulation, rated frequency of 50 Hz and rated capacity of 500 kVA and above for photovoltaics, wind power and energy storage on the new energy power generation side; oil-immersed transformers with three-phase 66 kV voltage level, non-excitation voltage regulation, rated frequency of 50 Hz and rated capacity of 3,150 kVA ~ 20,000 kVA for photovoltaics, wind power and energy storage on the new energy power generation side. This policy is not applicable to inflatable transformers, tower transformers and engine room transformers.

This policy replaces GB 20052-2020  Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers.