A microfluidic-based transformer oil micro-water detection system

A transformer oil and detection system technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of many consumables, narrow measurement voltage output range, small water detection range, etc.

Inactive Publication Date: 2020-08-04
ANHUI UNIVERSITY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a transformer oil micro-water detection system based on microfluidics, which solves the influence of the reference capacitance selection of the conventional dielectric constant method on the measurement results and the traditional dielectric constant measurement method. The consumables used There are many problems, the measurement voltage output range is narrow, and the micro water detection range is small; the present invention is realized through the following technical solutions:

Method used

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  • A microfluidic-based transformer oil micro-water detection system
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  • A microfluidic-based transformer oil micro-water detection system

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Embodiment 1

[0066] In this embodiment, the interdigital electrode structure model is taken as an example to describe the process of converting the water content in the test oil into the capacitance representation of the interdigital electrode. The manufacturing process of the microfluidic chip can be divided into eight steps, which are cleaning and oxidation of the silicon wafer substrate, sputtering of the lower electrode, coating of polyamic acid and imidization, sputtering of the upper electrode, etching and scribing, and corrosion. Upper electrode, etch the lead hole of the lower electrode, slice and press-weld the package. The cross-section of the interdigitated electrode structure is as follows image 3 As shown, the interdigital electrode capacitance can be equivalent to the ideal output capacitance C0 of the electric field line passing through the polyimide dielectric layer, the parasitic capacitance C1 of the electric field line passing through the silicon dioxide layer, and the ...

Embodiment 2

[0085] In this embodiment, the structure of the microfluidic chip is taken as an example to describe the process of transformer oil detection and water content model establishment based on the microfluidic chip.

[0086] Working mode one: open test oil injection valve 1-2 and standard oil injection valve 1-7, close test oil passage valve 1-5, standard oil passage valve 1-6. Test oil injection by P L1 N L1 —P L2 N L2 —P L3 N L3 constituted by the detection channel, the standard oil injected by P R1 N R1 —P R2 N R2 —P R3 N R3 In the test oil detection channel formed, the dimensions of the 12 interdigital positive electrodes and the 12 interdigital negative electrodes in the microfluidic chip of the present invention are consistent, so the standard oil equivalent capacitance as a reference capacitance in the detection system is expressed as:

[0087] C M1X1 =k 0 3n3lε 油 +C σ油M1 =9k 0 nlε 油 +C σ油M1 (9)

[0088] Similarly, the equivalent capacitance of the test ...

Embodiment 3

[0111] In this embodiment, the above-mentioned water content model and detection data are taken as examples to illustrate the numerical analysis of the detection results of transformer oil based on the microfluidic chip and the display of the upper computer. In the present invention, the sample stock solution of standard oil and measuring oil is injected at one time, and three measurement modes can be realized at one time according to the above sequence. By analyzing and comparing the measurement results obtained in the three modes, the " Various display methods and conclusions, such as "relative value of water content", "moisture content per unit volume", "warning curve of water content", are convenient for users to obtain the health status of transformer operation. In the actual detection, in order to further reduce the influence of parasitic capacitance and other environmental factors on the theoretical calculation results, a linear regression model was established for the m...

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Abstract

The invention relates to the technical field of precision detection instruments and in particular relates to a microfluidic-based transformer oil micro-water detection system. A microfluidic chip is electrically connected with a detection circuit; the detection circuit is electrically connected with a microprocessor; the microprocessor is electrically connected with an upper computer; influences,caused by selection of a reference capacitor of a dielectric constant method, on a measured result are reduced; meanwhile, the microfluidic chip is used as an oil product detection chip and has the advantages of rapid response, high precision, few consumable items, simplicity and convenience and the like; the designed microfluidic chip can realize the effects of one-step injection of a sample andmulti-mode measurement output; linear regression fitting is carried out on measurement results under various working modes through a least square method and influences, caused by environment factors including parasitic capacitance and the like, on measurement precision are reduced to the greatest extent. Compared with a traditional dielectric constant measurement method, the microfluidic-based transformer oil micro-water detection system has the advantages of few used consumable items, wide measurement voltage output range, large micro-water detection range, simplicity in production, high precision and rapid response and has a wide application prospect in the field of capacitive humidity detection.

Description

technical field [0001] The invention relates to the technical field of precision detection instruments, in particular to a transformer oil micro-water detection system based on microfluidics. Background technique [0002] Transformer oil is an important insulating medium inside the power transformer. It mainly plays the role of insulation, cooling and arc suppression in the power transformer. The quality of the oil directly affects the electrical performance and operating life of the transformer. Due to the dampness of the equipment and the action of high voltage and strong electric field, the micro water content in the transformer oil will increase with the increase of operation time. When the moisture content in the oil exceeds a certain threshold, the insulation performance of the equipment will be greatly reduced, and in severe cases, it may lead to major accidents such as insulation breakdown and equipment burnout. Therefore, the detection of micro-water content in tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/22
CPCG01N27/221G01N27/225G01N27/226G01N27/228
Inventor 王静董苏朱明山王峰王诗兵王中心赵佳韩波史晓凤
Owner ANHUI UNIVERSITY
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