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Quantitative characterization method for sulfur corrosion degree in transformer oil

A quantitative characterization and transformer oil technology, applied in the direction of removing certain components and weighing, can solve problems such as complex operations, and achieve the effects of simple and easy operation, wide application range, and strong practical application significance

Inactive Publication Date: 2018-04-17
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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Problems solved by technology

During the experiment, different reagents need to be added in multiple steps to react, and a standard curve needs to be drawn before the sulfate content is tested. The operation is complicated and requires a lot of manpower, material resources and time.

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  • Quantitative characterization method for sulfur corrosion degree in transformer oil
  • Quantitative characterization method for sulfur corrosion degree in transformer oil
  • Quantitative characterization method for sulfur corrosion degree in transformer oil

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Embodiment Construction

[0017] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0018] A method for quantitatively characterizing the degree of sulfur corrosion in transformer oil, said method comprising the steps of pretreatment of the test, carrying out of the aging test, removal of impurities on the surface of the copper sheet, correction of the influence of the oxidation reaction, and calculation of the sulfur corrosion rate;

[0019] in,

[0020] (1) Pretreatment of the test: polish the copper sheet to ensure that the roughness of each surface is consistent, wash with pure water and then wipe with alcohol, and finally air dry and weigh;

[0021] (2) Aging test: put the sample in a blast drying oven, and control the temperature at 150°C±2°C for accelerated aging for 72 hours;

[0022] (3) Removal of impurities on the surface of copper sheets: use petroleum ether to remove residual oil stains on the surface of copper s...

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Abstract

The invention provides a quantitative characterization method for a sulfur corrosion degree in transformer oil. The quantitative characterization method comprises the steps: performing test pretreatment, carrying out an aging test, removing impurities on the surface of sheet copper, correcting oxidation reaction effects, calculating a sulfur corrosion rate, and the like. By utilizing a calculationformula of a sulfur corrosion rate Vs, namely mass of sheet copper reacting with active sulfur in unit area and unit time, quantitative characterization of the sulfur corrosion degree in the transformer oil is realized. The method has a test parameter which is the mass of the sheet copper, does not involve detection of sulfides, is irrelevant to a specific corrosive sulfur component in the oil and can be used for characterizing the corrosion degree during coexistence of multiple sulfides. In actual application, the method is capable of realizing quantitative evaluation of the corrosion degreeof a copper conductor by only measuring the mass of the sheet copper before and after the aging test. The method is wide in application range and simple and feasible in operation, is not interfered by subjective factors and has high actual application significance.

Description

technical field [0001] The invention belongs to the technical field of sulfur corrosion detection in the electric power industry, and in particular relates to a quantitative characterization method for the degree of sulfur corrosion in transformer oil. Background technique [0002] At present, the transformer oil used in the power industry contains sulfur, nitrogen, oxygen and other elements in addition to a large amount of hydrocarbons. Sulfur mainly exists in the form of mercaptans, sulfides, disulfides, thiophenes and other compounds. The content is closely related to the origin of crude oil. The corrosive sulfur in the oil reacts with the copper flakes to form copper sulfides that adhere to the surface of the insulating paper, resulting in a decrease in the electrical properties of the insulating paper and endangering the safety of the insulation. In the past ten years, hundreds of transformer failures have occurred worldwide due to corrosive sulfur in insulating oil, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 连鸿松郑东升郭志斌赖永华吴奇宝舒想丛浩熹张敏昊刘慧鑫
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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