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Method for detecting content of dissolved methyl ethyl ketone in transformer oil

A detection method and transformer oil technology, applied in the field of power transmission and transformation, can solve the problems affecting transformers, easy escape of gas, easy adsorption of furfural by insulating paper, etc., and achieve the effect of simple operation, strong professional background, and fast detection speed

Inactive Publication Date: 2017-05-31
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used thermal aging indicators for insulating paper are dissolved CO in oil, CO 2 and furfural content, but due to CO, CO 2 It is difficult to accurately measure its true content due to the fact that the gas is easy to escape and furfural is easily absorbed by insulating paper. The influence is based on the dissolved CO and CO in the oil. 2 and the content of furfural to judge the accuracy of the aging degree of the transformer

Method used

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  • Method for detecting content of dissolved methyl ethyl ketone in transformer oil
  • Method for detecting content of dissolved methyl ethyl ketone in transformer oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Determination of methyl ethyl ketone characteristic peak and methanol internal standard peak

[0024] Weigh 400 mg of methyl ethyl ketone and dissolve it in 1 L of methanol to obtain a methyl ethyl ketone extract.

[0025] A laser with a wavelength of 532nm and a power of 100mW was used to determine the pure Raman spectra of methyl ethyl ketone, pure methanol and methyl ethyl ketone extract, the integration time is 3s, the number of integrations is 100, the slit width is 50μm, the grating is 600l / 500nm type grating, and the detection range is 250-2500cm -1 , see the result figure 1 , choose 763cm -1 The Raman spectrum peak at place is the characteristic peak of methyl ethyl ketone, 1450 -1 The Raman spectrum peak at is the internal standard peak of methanol.

Embodiment 2

[0026] Embodiment 2 Preparation of Standard Oil Sample

[0027] Weigh 400mg of methyl ethyl ketone in 1L of transformer oil at room temperature to prepare an oil sample with a concentration of 400mg / L, which is then diluted by 2 times to form a set of standard oil samples with concentrations of 200mg / L, 100mg / L and 50mg / L respectively; Enrich the concentration gradient, and dilute the 50mg / L standard oil sample to obtain a 20mg / L standard oil sample.

Embodiment 3

[0028] Embodiment 3 methyl ethyl ketone content determination

[0029] Step (1): respectively place 40mL of the standard oil samples of various concentrations prepared in Example 2 and 4mL of methanol in a 50mL brown Erlenmeyer flask with a stopper, stir for 5min under a magnetic constant temperature at 30°C, mix well and pour the mixture into 50mL In a centrifuge tube, centrifuge at a speed of 6000r / min for 5min, and take the methanol layer for later use;

[0030] Step (2): The methanol layer obtained in step (1) is placed in a 751-10mm type quartz cuvette, a 532nm wavelength laser is selected, the laser power is 100mW, the integration time is 3s, the number of integration times is 50, and the slit width is 50 μm, select 600l / 500nm type grating, measure the Raman spectrogram of the standard oil sample methanol layer of each concentration prepared in step (1); use MATLAB software to remove miscellaneous peaks, baseline adjustment and smoothing to the Raman spectrogram After n...

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Abstract

The invention relates to a method for detecting the content of dissolved methyl ethyl ketone in transformer oil. According to the method, the content of methyl ethyl ketone in a transformer oil sample is obtained by detecting the raman spectrum intensity of methyl ethyl ketone in the transformer oil sample pretreated by methyl alcohol. According to the method, the method is fast and convenient, the sample pretreatment is simple, the accuracy and the sensitivity are high, the detection cost is low, and the method is easy to popularize and apply in a wide range.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, in particular to a method for detecting the content of methyl ethyl ketone dissolved in transformer oil. Background technique [0002] The power transformer undertakes the tasks of voltage conversion and power distribution in the power system. It is the most important pivotal equipment in the power system, and its operation reliability is related to the safety and stability of the power system. Once the power transformer fails during operation, it will not only lead to damage or even scrapping of the power transformer, but also may cause large-scale power outages, resulting in huge economic losses. The detection and analysis of dissolved aging characteristics in transformer oil is one of the effective methods for monitoring the internal insulation of power transformers, which can detect the early deterioration of transformer oil-paper insulation in time. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 陈伟根万福顾朝亮李剑王有元杜林周湶王飞鹏
Owner CHONGQING UNIV
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