Home / Standards / GB/T 18891-2024 GB/T 18891-2024 Active Designation of phase differences by hour numbers in three-phase AC systems 三相交流系统相位差的钟时序数标识 Standard Type GBT ICS 29.020 CCS K09 Status 现行 Issue Date 2024-04-25 Implementation 2024-11-01 Responsible Dept 国家标准委 Drafting Unit N/A