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首页> 外文学位 >Detection of turn faults arising from insulation failure in the stator windings of ac machines.
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Detection of turn faults arising from insulation failure in the stator windings of ac machines.

机译：检测交流电机定子绕组中绝缘故障引起的匝道故障。

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摘要

Although ac machines are typically very rugged devices, failure may occur for a variety of reasons and at the most inopportune times. Fortunately, most machine failures are either avoidable with preventive maintenance, or foreseeable with predictive maintenance. In comparison to the costs associated with routine preventive maintenance and on-line condition monitoring, machine failures create disproportionate expenses relating to inconvenience, machine repair and lost production.; Degradation of the machine's insulation causes one prominent type of failure--electrical shorts, or stator turn faults. Simulation and analysis of a model for a turn-faulted induction machine leads to the conclusion that the primary symptom of a turn fault is slight changes in the relative character of the three terminal currents. This observation led to the development of two novel techniques to detect stator turn faults.; The first technique is based on the algebraic sum of the machine's three, calibrated, line-neutral voltages. This voltage sum is band-pass filtered and RMS-averaged to increase sensitivity and facilitate the condition-monitoring task. An increase in this signal's RMS magnitude indicates that the electrical balance of the machine has been altered. This method applies only to machines that are both wye-connected, and permit access to the stator neutral.; The second, alternate technique of turn-fault detection also detects changes in the machine's electrical balance, albeit through the RMS-magnitudes of the machine's three, calibrated, terminal-currents. Standard deviation is used to detect changes in the balance of these three currents. This method applies only for inverter-fed machines.; Both methods of turn-fault detection were verified experimentally with remarkable success by using only basic, developmental implementations. Both methods are sensitive, reliable, fast and particularly well-suited for incorporation in an inverter-drive. These turn-fault detection schemes provide enhanced benefits compared to the prior state-of-the-art in condition monitoring for incipient insulation failure.
机译：尽管交流电机通常是非常坚固的设备，但故障可能会由于各种原因而发生，并且是在最不适当的时间。幸运的是，通过预防性维护可以避免大多数机器故障，或者通过预测性维护可以避免大多数机器故障。与常规的预防性维护和在线状态监视相关的成本相比，机器故障造成了不便，机器维修和生产损失等不成比例的费用。电机绝缘性能的下降会导致一种主要的故障类型-电气短路或定子匝间故障。对带有故障的感应电机模型的仿真和分析得出的结论是，故障的主要症状是三个端子电流的相对特性发生了微小变化。这一发现导致了两种检测定子转向故障的新技术的发展。第一种技术是基于机器的三个校准线中性点电压的代数和。对该电压总和进行带通滤波和RMS平均，以提高灵敏度并促进状态监视任务。该信号的RMS幅度增加表明机器的电气平衡已经改变。该方法仅适用于星形连接的机器，并允许进入定子中性线。第二种替代性的故障检测技术，即使通过机器的三个校准端电流的RMS幅度，也可以检测机器的电气平衡变化。标准偏差用于检测这三个电流的平衡变化。该方法仅适用于逆变器供电的机器。仅使用基本的，开发性的实施方法，对两种故障检测方法都进行了实验验证，并取得了显著成功。两种方法都灵敏，可靠，快速，特别适合用于变频器。与先前的最新状态监测相比，这些匝间故障检测方案可提供增强的优势，以进行初始绝缘故障。

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