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Assessment of Insulation Degradation in Rotating Machines

机译：旋转机器中绝缘劣化评估

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To assess the degradation of stator winding insulation in high voltage motor, a total of forty-eight coils were manufactured. These coils are classified into five groups and there are twelve strands in each coil. Four coil groups are artificial defects such as shorted turn of strand, internal separation between conductor and insulation, large void within insulation and removal of semi-conductive tape. The other coil group is normal. Before ac breakdown test was performed, nondestructive test that included ac current, dissipation factor and partial discharge (PD) was done with five coil groups. This paper carried out by comparing the results between nondestructive test and ac breakdown test. When the values of ac current increase rate, tip-up dissipation factor and PD magnitude are large, the insulation is occurred the deterioration. AC breakdown voltage is also low in degraded insulation.
机译：为了评估高压电动机中定子绕组绝缘的降解，制造了总共48个线圈。这些线圈分为五组，每个线圈中有十二股。四个线圈组是人工缺陷，如短路转动，导体和绝缘之间的内部分离，绝缘内的绝缘空隙和半导体胶带的去除。另一个线圈组是正常的。在进行AC分解试验之前，用五个线圈组完成包括AC电流，耗散因子和局部放电（PD）的非破坏性测试。本文通过比较非破坏性测试和交流分解测试的结果进行。当AC电流增加速率的值，倾斜耗散因子和PD幅度大，但绝缘会发生劣化。 AC击穿电压在绝缘绝缘中也较低。

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