Method used for detecting anti-oxidant content of transformer oil via differential normal pulse voltammetry

A pulse voltammetry and antioxidant technology, which is applied in the field of chemical detection, can solve the problems of large-scale popularization of unfavorable methods, complicated sample pretreatment, and expensive instruments and equipment, and achieves optimized electrochemical measurement conditions, rapid measurement, and low cost. Effect

Active Publication Date: 2014-07-23
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the commonly used methods for detecting the content of T501 antioxidant in transformer oil include spectrophotometry, liquid chromatography and infrared spectroscopy, but each method has great defects: spectrophotometry, sample pretreatment is complicated, and the used There are many instruments and medicines, and the repeatability is poor; liquid chromatography and infrared spectroscopy are relatively accurate in detection, but the instruments and equipment are very expensive, and the measurement time is long, which is not conducive to the large-scale promotion of the method
[0005] Obviously, there is still no relatively mature and simple method for detecting the content of T501 antioxidant in transformer oil

Method used

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  • Method used for detecting anti-oxidant content of transformer oil via differential normal pulse voltammetry
  • Method used for detecting anti-oxidant content of transformer oil via differential normal pulse voltammetry
  • Method used for detecting anti-oxidant content of transformer oil via differential normal pulse voltammetry

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Embodiment 1

[0027] Method for Detecting Antioxidant Content in Transformer Oil Using Differential Conventional Pulse Voltammetry

[0028] Detection steps:

[0029] (1) Electrode pretreatment: use 0.3 μm alumina polishing powder to polish the graphite electrode with a diameter of 6 mm, then rinse it with deionized water, and ultrasonicate it in absolute ethanol for 3 min.

[0030] (2) Preparation of the sample to be tested: pipette 50ml 0.2mol L -1 Potassium hydroxide ethanol solution was used as blank sample. Pipette 1.5ml of standard transformer oil containing T501 antioxidant with a mass fraction of 0.5%, ultrasonically dissolve it in 50ml of 0.2mol L -1 Potassium hydroxide ethanol solution, as the sample to be tested.

[0031] (3) The measurement conditions of differential conventional pulse voltammetry were selected as follows: initial potential +0.4V, end potential -0.4V, potential increment 2-8mV, sampling width 0.001s.

[0032] (4) Draw the standard curve of T501 content: Accor...

Embodiment 2

[0035] Method for Detecting Antioxidant Content in Transformer Oil Using Differential Conventional Pulse Voltammetry

[0036] Detection steps:

[0037] The steps are the same as in Example 1, the difference is only in the preparation of the sample to be tested: pipette 1.0ml of transformer oil containing T501 antioxidant mass fraction of 0.5%, ultrasonically dissolve in 50ml of 0.2mol L -1 Potassium hydroxide ethanol solution, as the sample to be tested. The sample to be tested is measured by differential conventional pulse voltammetry, the measurement conditions are: initial potential +0.4V, end potential -0.4V, potential increment 2-8mV, sampling width 0.001s, the obtained differential conventional pulse voltammetry curve, see image 3 . In the TXT text corresponding to the characteristic curve of differential conventional pulse voltammetry, read the peak P of the characteristic oxidation peak of T501 antioxidant in the range of -0.1V to -0.2V, P=5.261e-6A. Put the P valu...

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Abstract

The invention discloses a method used for detecting anti-oxidant content of transformer oil via differential normal pulse voltammetry. According to the method, a certain amount of the transformer oil to be tested is dissolved in a certain volume of a supporting electrolyte so as to obtained a sample to be tested; a graphite electrode with a diameter of 6mm is taken as a working electrode, an electrochemical workstation is used, differential normal pulse voltammetry is adopted, and the sample is subjected to electrochemical detection with certain conditions; and the method used for detecting anti-oxidant content of transformer oil via differential normal pulse voltammetry is established based on that, in an obtained differential normal pulse voltammetry curve, the value of a peak current of T501 anti-oxidant characteristic peak is proportional to the value of the concentration of T501 anti-oxidant. Compared with existing technology, the method is low in cost, simple in operation, rapid in detection, and high in accuracy, is capable of realizing on-site analysis of samples, and possesses great significance on rapid accurate determination of T501 anti-oxidant content of the transformer oil.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, in particular to a method for detecting antioxidant content in transformer oil by using differential conventional pulse voltammetry. Background technique [0002] In order to effectively complete the various functions of transformer oil, the transformer oil itself must have good chemical, physical and electrical properties. Transformer oil is inevitably oxidized during operation, producing a large amount of peroxides and oxidation products such as alcohols, aldehydes, ketones, acids, etc. These oxidation products are very harmful to the safe operation of power system equipment. [0003] Transformer oil is added with T501 antioxidant before leaving the factory to improve the oxidation stability of the oil. However, excessive antioxidants will affect the electrical properties of the oil. At the same time, due to factors such as the operation of the purifier and the aging products in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 朱立平朱志平刘陈瑶于卫卫黄云光罗宗昌
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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