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Determining the color index of transformer insulating oil using UV-Vis spectroscopy

机译:用紫外可见光谱法测定变压器绝缘油的色指数

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The changes in color of the transformer oil have been used as measuring tools in determining the condition, performance and health of the transformer. Currently, the determination of color index is done by using a color comparator based on American Society for Testing and Materials (ASTM) D 1500 standard. This technique requires the tester or observer to compare the samples with two ASTM color references. Color is subjective and each individual could report a different color index. It could cause an error of 0.5 color index since the index difference between two consecutive ASTM color references is 0.5. Therefore, this work proposes the determination of color index of insulating oil using ultraviolet to visible (UV-Vis) Spectroscopy to eliminate any human handling error and improve the accuracy of the color index readings. Absorbance spectral responses of oils with different color index were used to correlate the color index with the absorbance spectral response of oil. Results show that the bandwidth of the absorbance spectral response is proportional to the color index of the oil. Modeled equation was developed to relate the bandwidth and color index of the oil. The equation was tested and verified by measuring the optical absorbance of another batch of transformer oil samples and inputting the bandwidths to obtain the color indices.
机译:变压器油的颜色变化已用作确定变压器的状况,性能和健康状况的测量工具。当前,颜色指数的确定是通过使用基于美国材料试验学会(ASTM)D 1500标准的颜色比较器来完成的。此技术要求测试人员或观察员将样品与两种ASTM颜色参考进行比较。颜色是主观的,每个人都可以报告不同的颜色指数。由于两个连续的ASTM颜色参考之间的索引差为0.5,因此可能会导致颜色索引错误0.5。因此,这项工作提出了使用紫外线到可见光(UV-Vis)光谱法测定绝缘油的颜色指数的方法,以消除任何人为操作错误并提高颜色指数读数的准确性。使用具有不同色指数的油的吸收光谱响应将颜色指数与油的吸收光谱响应相关联。结果表明,吸收光谱响应的带宽与油的颜色指数成正比。建立了模型方程,将油的带宽和颜色指数联系起来。通过测量另一批变压器油样品的吸光度并输入带宽以获取颜色指数,对方程进行了测试和验证。

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