ABSTRACT

Observing the transformer oil quality is essential for the transformer’s health and system. The aging state of the transformer oils and the average remaining life accordingly can be determined using the breakdown voltage (BDV) test, ultraviolet-visible (UV-Vis) spectroscopy, and the refractive index (RI) standard methods. The subject of this study is to design and manufacture a much simpler and low-cost, evanescent field absorption-based fiber optic sensor (EFA-FOS) compatible with these proven standard methods and to perform a comparative performance analysis by determining a critical voltage threshold. Apart from the expensive and cumbersome standard methods mentioned above, the usability of the oil is carried out, thanks to the online sensor system, with the pretest using this critical voltage value. EFA-FOS measurement results of oil samples can determine the samples’ aging degree with high accuracy. The samples’ RI is determined with EFA-FOS with a sensitivity of −70 V/RIU and a linearity of 0.98 (R²). A strong relationship has also been determined between the sensor output and measured BDV with a regression constant of 0.86 (R²).

摘要

观察变压器油的质量对于变压器的健康和系统至关重要。变压器油的老化状态和相应的平均剩余寿命可以使用击穿电压 (BDV) 测试、紫外-可见 (UV-Vis) 光谱和折射率 (RI) 标准方法来确定。本研究的主题是设计和制造一种更简单、成本更低、基于倏逝场吸收的光纤传感器 (EFA-FOS)，该传感器与这些经过验证的标准方法兼容，并通过确定临界电压阈值来执行比较性能分析. 除了上面提到的昂贵和繁琐的标准方法之外，由于在线传感器系统，油的可用性是通过使用这个临界电压值进行的预测试来进行的。油样的EFA-FOS测量结果可以高精度地判断样品的老化程度。样品的 RI 采用 EFA-FOS 测定，灵敏度为 -70 V/RIU，线性度为 0.98（R² )。还确定了传感器输出和测量的 BDV 之间的强关系，回归常数为 0.86 (R ² )。