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A study of the propagation behavior of partial discharge pulses in the high-voltage winding of hydro generators

机译:水轮发电机高压绕组中局部放电脉冲的传播特性研究

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Rotating electrical machines are one of the key assets for a reliable power supply. An unplanned outage of such components can lead to high follow-up costs. To prevent such unexpected occurrences the partial discharge (PD) diagnosis can be a reliable instrument for detecting failures in the insulation system before larger damages or a breakdown occurs. However, there have been repeated instances where the measurable apparent charge on the terminals does not correlate with damages found during inspection or repair. One important reason is the fact that PD-measuring systems with high bandwidth can only accurately measure PD-sources, which are located close to the terminals. The investigation described in this contribution intend to enhance the understanding of the propagation behavior of PD pulses in a stator winding. The goal of these tests is to contribute to a reliable identification of hidden PD symptoms in the stator winding insulation. To reach this goal, artificial PD impulses are injected at different parts of the winding of two different hydro generators. They are different in their physical size and electrical parameters. Measurements at the terminals of the stator windings are performed using both, the frequency selective PD system and a wide band digital oscilloscope. The result of the frequency selective measurement is a so-called “attenuation matrix”, where the dependence of the location of injection and the corresponding measurement of the apparent charge recorded at the terminals is presented. The analysis of recorded signals at the terminals of the stator winding shows strong damping phenomena for the high frequency content of the pulse and demonstrates the benefits of the frequency selective measurement.
机译:旋转电机是可靠电源的关键资产之一。此类组件的计划外中断可能导致高昂的后续费用。为防止此类意外事件,局部放电(PD)诊断可以作为在较大损坏或故障发生之前检测绝缘系统故障的可靠工具。然而,已经有重复的情况,端子上的可测量表观电荷与检查或维修期间发现的损坏不相关。一个重要的原因是高带宽的PD测量系统只能准确测量位于终端附近的PD源这一事实。此文稿中描述的研究旨在增强对PD脉冲在定子绕组中传播行为的理解。这些测试的目的是有助于可靠地识别定子绕组绝缘层中隐藏的PD症状。为了达到这个目标,在两个不同水力发电机的绕组的不同部分注入了人工PD脉冲。它们的物理尺寸和电气参数不同。使用频率选择性PD系统和宽带数字示波器对定子绕组的端子进行测量。频率选择性测量的结果是所谓的“衰减矩阵”,其中介绍了注入位置与端子上记录的视在电荷的相应测量值的相关性。对定子绕组端子处的记录信号进行的分析表明,对于脉冲的高频成分而言,它具有很强的阻尼现象,并证明了频率选择性测量的好处。

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