Home / Standards / GB/T 20840.4-2015 GB/T 20840.4-2015 Active Instrument transformers—Part 4:Additional requirements for combined transformers 互感器 第4部分:组合互感器的补充技术要求 Standard Type GBT ICS 29.180 CCS K41 Status 现行 Issue Date 2015-05-15 Implementation 2016-06-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A