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Test paper for measuring moisture of transformer oil, preparation and application

A technology for testing test strips and transformer oil, applied in the field of chemical detection, can solve the problems of unfavorable rapid detection, long detection time, and complicated operation, and achieve the effects of convenient and intuitive detection, long validity period and convenient production.

Active Publication Date: 2017-09-19
JIANGSU FRONTIER ELECTRIC TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no test paper for detecting the moisture content of transformer oil. Common methods for detecting the moisture content of transformer oil include coulometric method, gas chromatography, infrared spectroscopy, etc. These detection methods require laboratory conditions, and the detection time is long and the operation is cumbersome. , high cost, not conducive to rapid on-site detection

Method used

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  • Test paper for measuring moisture of transformer oil, preparation and application
  • Test paper for measuring moisture of transformer oil, preparation and application
  • Test paper for measuring moisture of transformer oil, preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Transformer oil moisture test paper, specifically prepared by the method comprising the following steps:

[0034] Step 1: Weigh 9 grams of copper sulfate, 9 grams of calcium sulfide and 5 grams of acid blue, grind them into powder in a mortar, and dry them in an oven at 80° C. to constant weight to remove water. The dried mixed powder was put into 200 ml of petroleum ether and continuously stirred to disperse evenly to obtain a color developer.

[0035] Step 2: Cut the cellulose paper sheet into paper sheets with a length of 8 cm and a width of 1 cm, and put them in an oven to dry at a temperature of 80° C. to a constant weight to remove moisture.

[0036] Step 3: Soak the dried cellulose paper in the color developer for 24 hours or more. If the soaking time is short, the color developer cannot be fully immersed in the cellulose paper. Put the soaked cellulose paper in a dry place. Store in the device for backup.

[0037] The prepared test paper is detec...

Embodiment 2

[0039] It should be noted that the above embodiments are the most preferred embodiments of the present invention, and do not limit the protection scope of the present invention. Embodiment 2: the judgment of test paper sensitivity

[0040] Soak the cellulose paper sheet prepared in Example 1 in the color developer, draw the transformer oil with a dropper, add about 5 milliliters of transformer oil dropwise on the test papers with different soaking times, and then compare the color changes of the test papers as shown in the table below :

[0041]

[0042]

[0043] It can be seen that the sensitivity of the test paper has a great relationship with the soaking time. When the soaking time reaches more than 24 hours, the test paper has better sensitivity.

Embodiment 3

[0044] Embodiment 3: Measure the transformer oil result comparison of different water contents

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Abstract

The invention discloses test paper for measuring moisture of transformer oil, preparation and an application. The test paper is prepared from a common cellulose paper piece with the cellulose content being 99.1%-99.6% as a carrier by soaking in a color developing agent, wherein the color developing agent is prepared from composition as follows: mixed powder of 38%-40% by mass of copper sulfate, 38%-40% by mass of calcium sulfide and 20%-22% by mass of acid blue which are weighed in an anhydrous environment is dissolved in petroleum ether, dispersed and mixed uniformly. The test paper is light blue and can detect trace moisture in the transformer oil sensitively, the color change process of the test paper is light blue, dark blue, aquamarine blue and black blue in sequence, the test paper is dark blue when the moisture content is 20 ppm, the color changes obviously, the period of validity is long, detection is convenient and visual, manufacture is simple, and the cost is low.

Description

technical field [0001] The invention relates to a fast, sensitive and convenient transformer oil moisture testing test paper, its preparation and application, and belongs to the field of chemical detection. Background technique [0002] Larger moisture content in transformer oil can deteriorate the electrical performance of transformer oil, reduce breakdown voltage and insulation resistance, increase dielectric loss, and reduce the overall insulation level of electrical equipment. It can accelerate the aging and degradation of paper fiber materials, especially when the oil contains more low-molecular-weight acids, the moisture will have a greater impact on the hydrolysis of the fibers, and the insulating paper will be permanently damaged. Therefore, the moisture in the transformer oil must be strictly monitored content. [0003] At present, there is no test paper for detecting the moisture content of transformer oil. Common methods for detecting the moisture content of tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 窦鹏孙和泰李军黄燕张华李亚龙
Owner JIANGSU FRONTIER ELECTRIC TECH
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