Home / Standards / GB/T 45906.9-2025 GB/T 45906.9-2025 Active Substation secondary system—Part 9:Construction specifications 变电站二次系统 第9部分:建设规范 Standard Type GBT ICS 29.240.10 CCS F20 Status 现行 Issue Date 2025-08-01 Implementation 2026-02-01 Responsible Dept 中国电力企业联合会 Drafting Unit N/A