本标准适用于具有云母基绝缘系统的成型绕线定子绕组线棒和线圈的电压耐久性试验，云母基绝缘系统采用热固性聚酯和/或环氧树脂，用于在额定线间电压为4000至22000V、频率为50Hz或60Hz的空气中运行的水轮发电机和抽水蓄能发电机。

This standard applies to voltage-endurance testing of form-wound stator winding bars and coils having a mica-based insulation system with theremo-setting polyester and/or epoxy resins used in hydrogenerators and pumped storage generators operating in air with a rated line-to-line voltage between 4 000 to 22 000 V, and a frequency of 50 Hz or 60 Hz.