GB 6450-1986
Replaced
GB/T 20840.4-2015
Active
National standards
GB/T 20840.4-2015 Instrument transformers—Part 4:Additional requirements for combined transformers
GB/T 20840.4-2015 Instrument transformers—Part 4:Additional requirements for combined transformers
Basic Information
Standard Code:
GB/T 20840.4-2015
Standard Type:
National standards
Standard Status:
Active
is_force_gb:
no
CCS Name:
Transformer
ICS Name:
Transformers, reactors, and inductors
Publish Date:
2015-05-15
Implement Date:
2016-06-01
Pages:
21 pages
Scope
This part of GB 20840 is applicable to newly manufactured combination transformers used in electrical measuring instruments and electrical protection devices, with a frequency of 15 Hz to 100 Hz. The requirements and tests of this part, as well as the requirements and tests of current transformers and electromagnetic voltage transformers included in GB 20840.1, GB 20840.2, and GB 20840.3, are all necessary for combination transformers.
Development Information
Replace the following standards
Adopt standards
IEC 61869-4:2013
Related Standards
GB/T 7449-1987
Replaced
GB/T 7449-1987 Guide to the lightning impulse and switching impulse testing of power transformers and reactors
GB 13028-1991
Abolished
GB 13028-1991 Isolating transformers and safety isolating transformers Requirements
GB/T 14006-1992
Active
GB/T 14006-1992 Outline dimensions of transformers and inductors for use in telecommunication and electronic equipment—Part 1:Transformers and inductors using YEI-1 laminations
GB/T 14860-1993
Replaced
GB/T 14860-1993 Generic specification for transformers and inductors for use in telecommunication and electronic equipment
GB/T 15164-1994
Replaced