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

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Scope

This document specifies the minimum allowable values of energy efficiency, the energy
efficiency grades and test methods for power transformers.
This document 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 document is not applicable to inflatable transformers, tower transformers and engine room
transformers.

Basic Data

Standard ID	GB 20052-2024 (GB20052-2024)
Description (Translated English)	Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers
Sector / Industry	National Standard
Classification of Chinese Standard	F01
Classification of International Standard	27.010
Word Count Estimation	26,264
Date of Issue	2024-04-29
Date of Implementation	2025-02-01
Older Standard (superseded by this standard)	GB 20052-2020
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration