This standard specifies the energy efficiency grades, limit values of energy efficiency, evaluation values of energy conservation and test methods for three-phase distribution transformers. This standard is applicable to oil-immersed distribution transformers with three-phase 10 kV voltage level, non-excitation voltage regulation, rated capacity 30 kVA~1600 kVA and dry-type distribution transformers rated capacity 30 kVA~2500 kVA. This standard does not apply to gas-filled transformers.
GB 20052-2013 Referenced Document
GB 1094.1 Power transformers.Part 1: General*, 2013-12-17 Update
GB 1094.11 Power transformers- Part 11: Dry-type transformers
GB/T 10228 Technical parameters and requirements for dry-type power transformers*, 2023-05-23 Update
GB/T 22072 Specifications and technical requirements for dry-type amorphous alloy core distribution transformers*, 2018-12-28 Update
GB/T 25438 Specification and technical requirments for three-phase oil-immersed tridimensional toroidal-core distribution stransformers
GB/T 25446 Specification and technical requirements for oil-immersed amorphous alloy core distribution transformers
GB/T 2900.15 Electrotechnical terminology. Transformer, instrument transformer, voltage regulator and reactor
GB/T 6451 Technical parameters and requirements of oil-immersed power transformers*, 2023-09-07 Update
GB 20052-2013 history
2020GB 20052-2020 Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers
2013GB 20052-2013 Minimum allowable values of energy efficiency and energy efficiency grades for three-phase distribution transformers
2006GB 20052-2006 The minimum allowable values of energy efficiency and the evaluating values of energy conservation for three-phase distribution transformers