Non-destructive identification method of non-disassemble winding coil material of dry-type three-phase distribution transformer
A technology of distribution transformers and winding coils is applied in the field of power transmission to achieve the effect of not destroying equipment and reducing losses
Active Publication Date: 2017-02-15
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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[0004] On October 25, 2012, the applicant applied to the State Intellectual Property Office for an invention patent entitled "Non-destructive Identification Method of Distribution Transformer Non-Disintegrated Coil Material" and the application number is 201210252278. In this patent, the applicant roughly described the previous However, in the follow-up experiment process, it was found that there are still many details that need to be improved in the above scheme
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[0038] Examples such as figure 1 As shown, due to the iron core and coil structure of the dry-type three-phase distribution transformer, the X-rays of the portable X-ray flaw detector below 350kV cannot penetrate the winding coil of the dry-type three-phase transformer from top to bottom, even if the X-ray passes through the winding coil circle tangent direction. However, due to the determination of the shape and size of the coil at the penetration site, the X-ray penetration thickness of the winding coil cannot be calculated, and the coil material identification cannot be performed. Therefore, X-rays are used to penetrate the lower end angle of the coil cylinder at a certain small angle, and the X-ray transillumination thickness difference of the winding coil can be calculated by using the end angle of the coil cylinder close to a right angle, and then according to the non-disintegrated coil of the dry-type three-phase distribution transformer The material non-destructive ide...
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The invention discloses a dry-type three-phase distribution transformer non-disassembly winding coil material non-destructive identification method. According to different attenuation coefficients of copper, steel, aluminum to X rays, X ray is employed to photographing a dry-type three-phase distribution transformer under a non-disassembly state, a black and white densimeter is employed to conduct blackness measurement on the photographed ray negative, the measured blackness value is input into a computer, an industrial radiographic film characteristic curve is adopted to undergo calculation and comparison with copper, steel and aluminum's different X-ray tube voltage X ray attenuation coefficients-transmission thickness curve stored in a computer, thus distinguishing that the winding coil of the dry-type three-phase distribution transformer is aluminum or copper.
Description
technical field [0001] The invention relates to a non-destructive identification method for a non-dismantled winding coil material of a dry-type three-phase power distribution transformer, which belongs 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 ...
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IPC IPC(8): G01N23/04
Inventor 张仁奇蒋欣
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD