Home / Standards / GB 20052-2020 GB 20052-2020 Abolished Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers 电力变压器能效限定值及能效等级 Standard Type GB ICS 27.010 CCS F01 Status 废止 Issue Date 2020-05-29 Implementation 2021-06-01 Responsible Dept 国家标准委 Drafting Unit N/A