The breakdown of transmission shaft in the main drive system is due to too high roll torque. Overpower protection mode of motor current does not reflect the true dynamic character of roll torque.

轧制力矩过大是轧机主传动系统传动轴断裂的主要原因，传统的电机电流过载保护方式不能真实反映轧机主传动系统扭矩的动力学特性。

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By the transmission line theory, the generation mechanism of common-mode voltage and the bearing current was discussed.

对变频输出共模电压及轴承电流的形成机理进行了研究，分析了其对潜油电泵轴承寿命的危害。

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