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Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
Power transformers—Part 11:Dry-type transformers
WITHDRAWN published on 30.4.2007
Selected format:Power transformers—Part 14:Design and application of liquid-immersed transformers using high-temperature insulation material
WITHDRAWN published on 30.12.2011
Selected format:Power transformers—Part 16: Transformers for wind turbine applications
WITHDRAWN published on 17.12.2013
Selected format:Power transformers—Part 2:Temperature rise
WITHDRAWN published on 31.3.1996
Selected format:Power transformersPart 2: Temperature rise for liquid-immersed transformers
WITHDRAWN published on 17.12.2013
Selected format:Power transformers--Part 3: Insulation levels and dielectric tests
WITHDRAWN published on 22.11.1985
Selected format:Power transformers—Part 3:Insulation levels,dielectric tests and external clearances in air
WITHDRAWN published on 26.5.2003
Selected format:Power transformers--Part 4: Tappings and connections
WITHDRAWN published on 1.1.1985
Selected format:Power transformers--Part 5: Ability to withstand short circuit
WITHDRAWN published on 22.11.1985
Selected format:Power transformers—Part 5:Ability to withstand short circuit
WITHDRAWN published on 26.5.2003
Selected format:Latest update: 2026-01-28 (Number of items: 2 257 539)
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