Power transformers; Electrical transformers, static converters (for example, rectifiers) and inductors (HS 8504); Energy and heat transfer engineering in general (ICS 27.010)
National Standard of the P.R.C., Minimum Allowable Values of Energy Efficiency and the Energy Efficiency Grades for Power Transformers (21 page(s), in Chinese)
This standard specifies the minimum allowable values of energy efficiency, energy efficiency grade and test method of three-phase power transformer.