GB 20840.4-2015
Instrument transformers.Part 4:Additional requirements for combined transformers (English Version)

Standard No.

GB 20840.4-2015

Language

Chinese, Available in English version

Release Date

2015

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB 20840.4-2015

Replace

GB 17201-2007

Scope

This part of GB 20840 applies to newly manufactured combined transformers for 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 combined transformers.

GB 20840.4-2015 Referenced Document

• GB 20840.1-2010 Instrument transformers-Part 1:General requirements
• GB 20840.2-2014 Instrument transformers.Part 2:Additional requirements for current transformers
• GB 20840.3-2013 Instrument transformers.Part 3:Additional requirements for inductive voltage transformers

GB 20840.4-2015 history

• 2015 GB 20840.4-2015 Instrument transformers.Part 4:Additional requirements for combined transformers
• 2007 GB 17201-2007 Combined instrument transformers
• 1997 GB 17201-1997 Combined transformers

GB 20840.4-2015 Instrument transformers.Part 4:Additional requirements for combined transformers has been changed from GB 17201-2007 Combined instrument transformers.

GB 20840.4-2015 -All Parts