In this paper, the time reversal (TR) technique is extended to localize a partial discharge (PD) source in the acoustic regime. The proposed acoustic TR method consists of three steps, a) the acoustic waves emitted by the PD source are recorded by at least one sensor, b) the recorded signal(s) are reversed in time and back injected into the considered medium via numerical simulation, and c) an appropriate criterion is applied to identify the focal spot, which corresponds to the PD source location. We present a numerical validation of the proposed method in which the acoustic wave equations are solved numerically using the two-dimensional (2D) finite-difference time-domain (FDTD) method. The minimum entropy criterion is used to localize the PD source. The numerical results reveal that the proposed acoustic TR method is very efficient in localizing the PD source in the presence of the transformer windings.

中文翻译：

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定位局部放电源的声学时间反转技术：二维数值验证

在本文中，时间反转 (TR) 技术被扩展到在声学范围内定位局部放电 (PD) 源。所提出的声学 TR 方法由三个步骤组成，a) PD 源发射的声波由至少一个传感器记录，b) 记录的信号及时反转并通过数值模拟回注入到所考虑的介质中，和 c) 应用适当的标准来识别与 PD 源位置相对应的焦点。我们提出了所提出的方法的数值验证，其中使用二维 (2D) 有限差分时域 (FDTD) 方法对声波方程进行数值求解。最小熵准则用于定位 PD 源。