GB 20052-2020: Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers

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Scope

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.

Basic Data

Standard ID	GB 20052-2020 (GB20052-2020)
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	19,166
Date of Issue	2020-05-29
Date of Implementation	2021-06-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration