Detection on interfacial tension of insulating oil with trace water based on mid-infrared spectroscopy

CHEN Bin; WU Hong-yang; ZHANG Xian-ming; LIU Ge

doi:10.3788/OPE.20152309.2452

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Detection on interfacial tension of insulating oil with trace water based on mid-infrared spectroscopy

更新时间：2020-08-12

- Detection on interfacial tension of insulating oil with trace water based on mid-infrared spectroscopy
- Optics and Precision Engineering Vol. 23, Issue 9, Pages: 2452-2458(2015)
- 作者机构：
  
  重庆工商大学废油资源化技术与装备教育部工程研究中心重庆,400067
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152309.2452
  CLC： O657.33
- Received：13 February 2015，
  
  Revised：19 March 2015，
  
  Published：25 September 2015
- 稿件说明：
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陈彬, 武宏阳, 张贤明等. 含微水绝缘油表面张力的中红外光谱检测[J]. 光学精密工程, 2015,23(9): 2452-2458

CHEN Bin, WU Hong-yang, ZHANG Xian-ming etc. Detection on interfacial tension of insulating oil with trace water based on mid-infrared spectroscopy[J]. Editorial Office of Optics and Precision Engineering, 2015,23(9): 2452-2458
陈彬, 武宏阳, 张贤明等. 含微水绝缘油表面张力的中红外光谱检测[J]. 光学精密工程, 2015,23(9): 2452-2458 DOI： 10.3788/OPE.20152309.2452.

CHEN Bin, WU Hong-yang, ZHANG Xian-ming etc. Detection on interfacial tension of insulating oil with trace water based on mid-infrared spectroscopy[J]. Editorial Office of Optics and Precision Engineering, 2015,23(9): 2452-2458 DOI： 10.3788/OPE.20152309.2452.

摘要

为了有效监控绝缘油的运行状态

采用定量分析方法探讨了微量水分对绝缘油表面张力的影响规律。通过配制不同微水含量的绝缘油样

对每组油样进行表面张力测试

然后对油样进行红外光谱扫描

获取了油样中水分在特征波数处(1 640

3 400

3 450

3 615 cm

-1

)的吸光度值。分析了油液中2

6-二叔丁基对甲酚(T501)等添加剂对油样表面张力变化规律的影响。结果表明:油样中水分含量与水分特征吸光度值之间有较好的相关性(相关系数分别为0.964 1

0.984 8

0.984 5

0.944 0)

油样表面张力和1 640

3 400

3 450

3 615

3 650 cm

-1

波数处油样吸光度值的变化亦均呈现良好的正相关性。建立了油样表面张力与特征波数处油样吸光度值的多元线性回归模型

拟合精度为0.992 8;根据模型得到的表面张力计算值与实际测量值误差为-0.07~0.06%

吻合性较好。文中的实验可为含微水绝缘油的表面张力检测提供理论支撑。

Abstract

To monitor the operating status of insulating oil effectively

the affecting law of trace water on the interfacial tension of insulating oil was investigated by a quantitative method. By making up a series of oil samples with different trace water contents

the interfacial tension of every group of oil sample was measured and its mid-infrared spectrum was scanned. Then

the absorbance values of oil samples at the characteristic wave number of water molecules (1 640 cm

-1

3 400 cm

-1

3 450 cm

-1

3 615 cm

-1

) were obtained and the influence of the 2

6-Di-tert.-butyl-p-cresol (T501)

a kind of additive in oil samples

on the interfacial tension was analyzed. The results show that the trace water contents in oil samples are dependent on water characteristic absorbance values

which can be up to 0.964 1

0.984 8

0.984 5 and 0.944 0. Moreover

there is a good positive correlation between the trace water contents in oil samples and the changes of absorbance values of oil samples at 1 640 cm

-1

3 400 cm

-1

3 450 cm

-1

3 615 cm

-1

3 650 cm

-1

. According to these data

a multiple linear regression model with the goodness fit of 0.992 8 was constructed. The error between calculated values and measured values of the interfacial tension varies from -0.07% to 0.06%

shows a good coincidence. This research supports the measurement of interfacial tension for insulating oil in theory.

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Keywords

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