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Transformer oil sludge ageing composition detection method

A transformer oil and detection method technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of loss of ability to absorb shock load, reduce transformer operating load, single detection and analysis of aging products, etc., to meet the requirements of rapid diagnosis, The effect of improving accuracy

Inactive Publication Date: 2018-05-18
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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AI Technical Summary

Problems solved by technology

The precipitation of sludge aging products can adhere to insulating materials, transformer oil tank shell walls, and can be deposited in circulating oil passages and cooling fins, etc., which will cause great harm to transformers, including accelerating the corrosion and destruction of solid insulating materials, resulting in Insulation shrinks and loses the ability to absorb impact loads, blocks the oil passage, seriously affects heat dissipation, causes partial overheating of the transformer coil, and increases the operating temperature of the transformer, thereby reducing the operating load of the transformer
[0004] At present, the monitoring of sludge aging products is mainly carried out through DL / T 429.7-1991 and NB / SH / T0811-2010, but they are all qualitative monitoring of sludge production or quality changes, without testing the composition of sludge, and are all Single detection and analysis of aging products, no comprehensive detection and analysis of oil sludge aging products, so it is impossible to accurately and quickly find out the source of failure caused by transformer oil aging products

Method used

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  • Transformer oil sludge ageing composition detection method
  • Transformer oil sludge ageing composition detection method
  • Transformer oil sludge ageing composition detection method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] In November 2016, the transformer of a power company broke down, and after disassembly, a brown transparent greasy aging product was found in the oil passage.

[0048] Take 5 g of the fat-like aging product, add 50 g of aviation kerosene, add a stirrer, and heat the mixture to 80° C. under stirring conditions, and keep stirring at this temperature for 1 hour. The mixture was suction-filtered while it was hot to separate the clear liquid and filter residue, and no filter residue was found in this example. The obtained serum was analyzed for soluble elements by atomic emission spectrometry, according to the ASTM D7151-2015 standard, and the mass of soluble elements in the sludge aging product was obtained. The results are shown in Table 1.

[0049] It can be seen from the test results in Table 1 that, compared with aviation kerosene, the greasy dirt contains a large amount of Al and Si elements, and also contains a small amount of metal elements such as Fe, Cu, Ca, and Zn...

Embodiment 2

[0054] In 2016, a 220kV transformer of a power company broke down, and the inspection of the hanging cover found that there were particles of impurities in the lower fuel tank, the bottom of the tank, and the upper pull plate.

[0055] (1) Take 1g of particulate impurities from three different parts, add 10g of new transformer oil, add a stirrer, heat the mixture to 60°C under stirring conditions, and keep the temperature for 2 hours. The mixture was suction filtered while it was hot, and the clear liquid and filter residue were separated. The obtained serum was analyzed by atomic emission spectrometry to obtain the mass of soluble elements in the sludge aging product, and the results are shown in Table 2. It can be seen from the test results in Table 2 that the content of each metal element is not high. Among the metal elements considered mainly (other elements such as Al, Pb, Ni, etc. are close to the detection limit of the instrument method), the content of iron and copper...

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Abstract

The invention discloses a transformer oil sludge ageing composition detection method which comprises the following steps of step 1, mixing aged oil sludge with a solvent, heating a mixture, and performing separation to obtain clear liquid and filter residues; step 2, detecting elements and contents thereof in the clear liquid in the step 1, and detecting elements, contents thereof, iron oxide, a crystalline compound, fiber substances and X wax in the filter residues in the step 1; and step 3, comparing the elements in the clear liquid and the elements in the filter residues obtained in the step 2 to elements in new transformer oil or aviation kerosene, and judging a source of an oil sludge ageing product. By judging the elements in the clear liquid and the filter residues in the transformer oil sludge as well as the iron oxide, the crystalline compound, the fiber substances and the X wax in the filter residues, the transformer oil sludge ageing composition detection method accurately and rapidly diagnose the oil sludge ageing composition and the source thereof comprehensively and meets the requirement for rapidly diagnosing the oil sludge ageing product.

Description

technical field [0001] The invention relates to the field of transformer oil detection, in particular to a method for detecting the aging composition of transformer oil sludge. Background technique [0002] Transformer oil has excellent electrical performance and stability. It is a widely used insulating medium and plays the role of insulation, heat dissipation and cooling, protection and information carrier. However, under the influence of long-term operation of the transformer or external factors, the transformer oil will deteriorate and form a series of oxidation products, such as peroxides, alcohols, aldehydes, ketones, esters, gums and asphaltenes, and finally form aging products precipitation phenomenon. [0003] The sludge aging product is a kind of viscous asphaltene, which has certain conductivity and can be moderately dissolved in transformer oil. The precipitation of sludge aging products can adhere to insulating materials, transformer oil tank shell walls, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3577G01N21/84G01N23/20
CPCG01N21/3577G01N21/84G01N23/20G01N2223/1016
Inventor 赵耀洪钱艺华陈天生范圣平吕旺燕林木松
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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