变压器油烃组成与其抗氧剂含量检测偏差的关联性研究及方法优化

采用不同烃组成的变压器油基础油建立标准曲线,考察不同标准曲线检测不同烃组成变压器油抗氧剂的差异性。结果表明:以不同烃组成基础油建立的标准曲线,用于检测烃组成差异较大的变压器油中抗氧剂含量时,偏差较大,基础油中芳烃含量高低对其检测结果影响最大。对检测方法提出优化方案,采用低芳烃(CA值为0.23%)基础油建立标准曲线,进行样品抗氧剂含量检测,归纳出修正因数,并建立修正式,利用修正式得到修正值与理论值的偏差小于0.005百分点,提高了检测方法的准确性。

CORRELATION OF TRANSFORMER OIL COMPOSITION WITH DETECTION DEVIATION OF ANTIOXIDANT CONTENT AND DETECTION METHOD OPTIMIZATION

The standard curves of relations of actual value and measured value are established based on transformer oils with different hydrocarbon compositions to investigate the different measured results of antioxidant content in the oils. The results show that the measured values change with aromatic content and the detection deviation is largely depends on the aromatic content in oils. To optimize the measuring method, low aromatic content base oil (CA value 0.23%) is used to establish calibration curves for detecting antioxidant content of samples. The correction factors and the modifier formula are established to calculate the correct value. The deviation between the correct value and the theoretical value is less than 0.005 point. The optimization greatly improves the accuracy of the detection method.