Home / Standards / GB/T 20833.4-2021 GB/T 20833.4-2021 Active Rotating electrical machines—The winding insulation—Part 4: Measurement of insulation resistance and polarization index 旋转电机 绕组绝缘 第4部分:绝缘电阻和极化指数测量 Standard Type GBT ICS 29.160.01 CCS K20 Status 现行 Issue Date 2021-03-09 Implementation 2021-10-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A