The temperature on the busbars of electric generators in the end-winding region needs to be monitored continuously. High temperature is associated with curvatures, seams, and poor ventilation. However, this solution has limitations, such as the number of measurement points. This article presents a reconstruction algorithm to estimate high-resolution signals, from readings of a distributed temperature system for monitoring high-power generator bars. The purpose of this work is to measure the temperature in the end-winding region with optical sensors based on Raman distributed temperature sensing (RDTS). The ability of RDTS equipment to perform a measurement is limited by its spatial resolution of 1 m. The proposed algorithm reduces spatial resolution through signal processing without changing the equipment hardware. Through the experimental results, it was possible to perform accurate temperature measurements for lengths up to 15 cm using the sensor element. With this method, the final winding of a generator bar of a 355 MW hydroelectric plant was instrumented in the laboratory. The results show that it is possible to monitor the temperature over this region, which has a length of 45 cm. Therefore, the proposed method has the potential for the use of RDTS systems for temperature acquisition of small, medium, and large electrical machines.

中文翻译：

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大功率发电机端绕组的拉曼分布式温度传感

末端绕组区域中发电机母线的温度需要连续监控。高温与曲率，接缝和通风不良有关。但是，该解决方案具有局限性，例如测量点数。本文提出了一种重构算法，用于从分布式温度系统的读数中估算高分辨率信号，以监控大功率发电机的条形。这项工作的目的是使用基于拉曼分布温度感测（RDTS）的光学传感器测量端部绕组区域的温度。RDTS设备执行测量的能力受到其1 m的空间分辨率的限制。该算法在不改变设备硬件的情况下，通过信号处理降低了空间分辨率。通过实验结果，使用传感器元件可以进行长达15 cm的精确温度测量。通过这种方法，在实验室中对355 MW水力发电厂的发电机棒的最终绕组进行了测量。结果表明，可以监视长度为45 cm的该区域的温度。因此，所提出的方法具有将RDTS系统用于小型，中型和大型电机温度采集的潜力。