Home / Standards / GB/T 28028 GB/T 28028 Active Criteria for assessing and coding of the commutation of rotation electrical machines for traction 牵引旋转电机换向的评定和编码准则 Standard Type GBT ICS 29.280 CCS S35 Status 现行 Issue Date 2011-10-31 Implementation 2012-04-01 Responsible Dept 国家铁路局 Drafting Unit 国家铁路局