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An Online Technique for Monitoring the Insulation Condition of AC Machine Stator Windings

机译：交流电机定子绕组绝缘状态在线监测技术

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摘要

A novel online technique for monitoring the insulation condition of ac machine stator windings is proposed in this paper. The concept is to measure the differential leakage currents of each phase winding from the terminal box in a noninvasive manner to assess the insulation condition during motor operation. The conventional differential CTs used for phase fault protection can be replaced with high performance current sensors to measure the leakage current with higher accuracy. Indicators for insulation condition such as the capacitance and dissipation factor are calculated based on the measurements to provide a low cost solution for online insulation condition assessment. A simplified online insulation system model is derived for analysis and interpretation of the measured data. Experimental results on a 15-hp induction motor under simulated insulation degradation conditions show that the proposed technique is a very sensitive method capable of detecting incipient signs of insulation degradation.
机译：提出了一种在线监测交流电机定子绕组绝缘状态的新技术。该概念是通过无创方式测量接线盒中每个相绕组的差分漏电流，以评估电动机运行期间的绝缘状况。用于相位故障保护的常规差动CT可以替换为高性能电流传感器，从而以更高的精度测量泄漏电流。根据测量结果计算绝缘条件的指标，例如电容和耗散因数，从而为在线绝缘条件评估提供低成本解决方案。导出了简化的在线绝缘系统模型，用于分析和解释测量数据。在模拟绝缘退化条件下的15 hp感应电动机上的实验结果表明，该技术是一种非常灵敏的方法，能够检测绝缘退化的初期迹象。

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