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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
Substation secondary system—Part 1General requirement
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 10: Test and detection
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 2: Data and model
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 3: Communication message specification
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 4:Cyber security protection
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 5: Protection and control system with their equipment’s requirements
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 6: Substation monitoring and control system
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 7: Centralized monitoring and control system of substationm
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 8:Preventing electric mal-operation
Standard published on 1.8.2025
Selected format:Substation secondary system—Part 9:Construction specifications
Standard published on 1.8.2025
Selected format:Latest update: 2026-11-11 (Number of items: 2 209 285)
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