Trace water has a significant impact on the electrical performances of the insulating oil ,such as the dielectric loss fac‐tor ,resistivity .So there is an important significance to investigate the influence of insulating oil by trace water ,and monitor its operating status with effective measures .First ,it is necessary to prepare the insulating oil samples with different water content and treat them 8 hours with ultrasonic oscillator ,and observe microscopic images about the water‐oil mixtures in order to study their relative uniformity and stable time ,in the way it can be concluded that the relative uniformity can be kept favorable during the 25 min stable time for free water and emulsification water in oil;Based on this conclusion ,the dielectric loss factor ,resistivi‐ty were tested and the electrical performances of insulating oil with different water content in oil can obtained by analyzing these data;Then ,the absorbance value of the different water content in oil at the spectral wave number of 1 640 ,3 400 ,3 450 ,3 615 cm -1 ,with the mid‐infrared spectral scanning and analyzing to the different water content in oil ,Therefore ,combined the water absorbance values by the mid‐infrared spectral scanning and analyzing with the experimental data of dielectric loss factor value , resistivity value of oil samples .The results shows that the absorbance value of the different water content in oil has a significant difference at the spectral wave number of 1 640 ,3 400 ,3450 ,3 615 cm-1 ,their correlation coefficient are 0.964 1 ,0.984 8 , 0.984 5 ,0.944 0 between the absorbance value and water content at the spectral wave number of 1 640 ,3 400 ,3 450 ,3 615 cm -1 ,it can be obtained that the absorbance value of sample of moisture in the corresponding characteristic wave number can better reflect the change trend of water content ;there is the highly relative of water absorbance values at the spectral wave num‐ber of 3 400 and 3 450 cm -1 with the trends of oil dielectric loss factor values ,their correlation coefficient are 0.860 6 ,0.863 6 ;and relative of water absorbance values at the spectral wave number of 1 640 and 3 615 cm -1 with the trends of oil resistivity val‐ues ,their correlation coefficient is -0.931 5 and -0.968 0 ,this result can be lay the foundation research for monitoring the trace water in oil .%微量水分对绝缘油的介质损耗因数、电阻率等电气性能指标有明显的影响，探讨绝缘油受微量水分的影响规律，对于采取有效措施监控绝缘油的运行状态具有重要意义。首先对配制不同微水含量的绝缘油经过超声波振荡8 h后再进行显微图像观察，得到该油水分散系中游离水和乳化水相对均匀程度在25 m in内其分散状态较为稳定；在此基础上对油水分散系的介质损耗因数、电阻率指标进行了实验测试，得到了微水对绝缘油的电气性能指标的影响规律；然后对不同微水含量的绝缘油进行中红外光谱分析，得到不同微水含量的绝缘油在1640，3400，3450，3615 cm －1波数处的吸光度值。结合绝缘油中红外光谱分析的吸光度值变化以及实验测试结果表明油样在1640，3400，3450，3615 cm－1水分的特征波数处吸光度值数据随水分含量不同而产生明显变化，且吸光度值与水分含量的皮尔逊相关系数分别为0.9641，0.9848，0.9845，0.9440，油样中水分在相应特征波数处的吸光度值能够较好的反映出油样中水分含量的变化趋势；微水对绝缘油介质损耗因数的影响和水分子在3400和3450 cm－1特征波数处的吸光度值变化趋势之间的相关系数较大，分别为0.8606和0.8636；微水对绝缘油介质损耗因数的影响和水分子在1640和3615 cm －1特征波数处的吸光度值变化趋势之间的相关系数分别为－0.9315和－0.9680，从而为绝缘油中微水的监测奠定了前期研究基础。
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