GB 20052-2024 Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers

Scope

This document specifies the energy efficiency limits, energy efficiency grades, and test methods for power transformers.
This document applies to oil-immersed distribution transformers and dry-type distribution transformers with a three-phase voltage rating of 10 kV, non-excitation voltage regulation, a rated frequency of 50 Hz, and a rated capacity of 30 kVA to 2,500 kVA; oil-immersed power transformers with a voltage rating of 35 kV to 500 kV, a rated frequency of 50 Hz, and a rated capacity of 3,150 kVA and above; new energy power generation-side photovoltaic, wind power, and energy storage oil-immersed and dry-type transformers with a three-phase voltage rating of 6 kV to 35 kV, non-excitation voltage regulation, a rated frequency of 50 Hz, and a rated capacity of 500 kVA and above; and oil-immersed transformers for new energy power generation-side photovoltaic, wind power, and energy storage with a three-phase voltage rating of 66 kV, non-excitation voltage regulation, a rated frequency of 50 Hz, and a rated capacity of 3,150 kVA to 20,000 kVA.
This document does not apply to gas-insulated transformers, tower-mounted transformers, and engine room transformers.

Development Information

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