Standard No.:	GB 24790-2009
English Name:	Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers
Chinese Name:	电力变压器能效限定值及能效等级
Chinese Classification:	F01    Technical management
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ; SAC
Issued on:	2009-12-15
Implemented on:	2010-7-1
Status:	superseded
Superseded by:	GB 20052-2020 Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers
Superseded on:	2021-6-1
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	184.0
Delivery:	via email in 1 business day

This standard specifies the minimum allowable values of energy efficiency, target minimum allowable values of energy efficiency, evaluating values of energy conservation, energy efficiency grade and test methods of power transformer. This standard is applicable to the three-phase oil-immersed power transformers of 50Hz in rated frequency, 35kV ~220kV in voltage grade and 3150kV•A and more in rated capacity. This standard is not applicable to the dry-type transformer, high impedance transformer and gas-filled type transformer.

Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 4 Technical Requirements 5 Test Methods