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Non-destructive identification method for material of integral coil of distribution transformer

A distribution transformer and material technology, applied in the field of power transmission, can solve problems such as increased power supply costs, excessive coil volume, and increased power consumption of transformers, and achieve the effects of not damaging equipment, having obvious market prospects, and reducing losses

Active Publication Date: 2012-10-24
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Under the current market economy, some short-sighted power grid distribution network transformer manufacturers use aluminum enameled wire instead of copper enameled wire as the transformer coil winding in order to pursue greater profits, resulting in excessive coil volume and increased coil impedance, which increases the power consumption of the transformer. Increase the cost of power supply and seriously affect the interests of power supply companies
Because the transformer coil winding is wrapped with an insulating layer, even if the transformer is disassembled and not damaged, it is still impossible to identify the coil material through electrical tests and visual inspections, unless the coil is damaged and sampled for metal chemical analysis, but this damage test It cannot be carried out one by one, otherwise the cost will be huge, and the transformer will be shut down for maintenance, which will seriously affect the grid power supply and social production and living order

Method used

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  • Non-destructive identification method for material of integral coil of distribution transformer
  • Non-destructive identification method for material of integral coil of distribution transformer
  • Non-destructive identification method for material of integral coil of distribution transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] Embodiment, the non-destructive identification method of distribution transformer non-disassembled winding coil material includes the following steps

[0027] a. Use a ray flaw detector and industrial ray film to take pictures of the distribution transformer under test in a non-disassembled state. When taking pictures, the ray flaw detector uses different X-ray tube voltages to irradiate the winding area of ​​the distribution transformer under test, and a set is obtained. Industrial X-ray film after taking pictures; the X-ray flaw detector used is a 350kV X-ray flaw detector. The winding area of ​​the power distribution transformer is the edge area of ​​the winding.

[0028] b. Perform darkroom processing (developing, stopping, fixing, washing, and drying) on ​​a group of photographed industrial radiographic films to obtain a set of image negatives of the winding and coil of the distribution transformer under test;

[0029] c. Use a black-and-white densitometer to meas...

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PUM

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Abstract

The invention discloses a non-destructive identification method for a material of an integral coil of a distribution transformer. The non-destructive identification method based on the difference of attenuation coefficients of copper, steel and aluminum to X rays includes photographing the distribution transformer in a integral state by the X rays; measuring blackness of photographed negative films of the rays by a black and white densitometer; inputting measured blackness values into a computer; and computing X-ray attenuation coefficient and transillumination thickness curves, which are stored in the computer, of the copper, the steel and the aluminum corresponding to different X-ray tubes and comparing the X-ray attenuation coefficient and transillumination thickness curves with a characteristic curve of the industrial ray films, and judging whether the winding coil of the distribution transformer is made of the aluminum or the copper.

Description

technical field [0001] The invention relates to a non-destructive identification method for non-disintegrated coil materials of distribution transformers, belonging to the technical field of power transmission. Background technique [0002] In the current market economy, some short-sighted grid distribution network transformer manufacturers use aluminum enameled wire instead of copper enameled wire as the transformer coil winding in order to pursue greater profits, resulting in excessive coil volume and increased coil impedance, which increases the power consumption of the transformer. Increase the cost of power supply and seriously affect the interests of power supply enterprises. Because the transformer coil winding is wrapped with an insulating layer, even if the transformer is disassembled and not damaged, it is still impossible to identify the coil material through electrical tests and visual inspections, unless the coil is damaged and sampled for metal chemical analysi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04
Inventor 张仁奇代发明蒋欣
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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