CN104502369A - Three dimensional wound core oil immersed three-phase distribution transformer non-disassembly coil material identification method - Google Patents

Abstract

The invention discloses a method for identifying the non-disassembled coil material of a three-dimensional wound core oil-immersed three-phase distribution transformer. According to the difference in the attenuation coefficients of copper, steel and aluminum to X-rays, X-rays are used to identify the three-dimensional wound core in a non-disassembled state. Take pictures of oil-immersed three-phase distribution transformers, use a black-and-white density meter to measure the blackness of the photographed radiographs, input the measured blackness values into the computer, use industrial radiographic film characteristic curves, and pass through different X-ray tubes stored in the computer The voltage copper, steel, aluminum X-ray attenuation coefficient-transillumination thickness curves are calculated and compared, and the winding coil of the three-dimensional wound core oil-immersed three-phase distribution transformer is judged to be aluminum or copper.

Description

Identification method of non-disintegrated coil material of three-dimensional wound core oil-immersed three-phase distribution transformer

technical field

The invention relates to a method for identifying the material of a non-disintegrated coil of a three-dimensional wound core oil-immersed three-phase distribution transformer, belonging to the technical field of power transmission.

Background technique

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 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 power supply of the power grid and the order of social production and life.

Therefore, a method to identify the coil material of the distribution network transformer without disintegration is the dream method of the power grid enterprise.

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 subsequent experiment process, it was found that there are still many details that need to be improved in the above scheme.

Three-dimensional wound core oil-immersed three-phase distribution transformers are widely used in urban and rural distribution networks. The oil tank of this type of transformer is in the shape of a triangular cylinder. The appearance is shown in Figure 1. The iron core, coil, and transformer oil are sealed in the oil tank. To the shape and size of the core and coil. In order to identify non-disintegrated and damaged coil materials of three-dimensional wound core oil-immersed three-phase distribution transformers, it is necessary to solve the X-ray transillumination method and transillumination process of the transformer oil tank and coil winding.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for identifying the winding coil material of the three-dimensional wound core oil-immersed three-phase distribution transformer by taking X-ray photos without dismantling the three-dimensional wound core oil-immersed three-phase distribution transformer. The deficiencies of the prior art can be overcome.

The technical solution of the present invention is: a method for identifying the non-disintegrated coil material of a three-dimensional wound core oil-immersed three-phase distribution transformer, which is aimed at three-dimensional wound core oil-immersed three-phase distribution transformers, three-dimensional wound core oil-immersed three-phase distribution transformer three-phase windings The coils are arranged in a triangle, and the method comprises the following steps

a. Use the X-ray machine and X-ray film to take pictures of the three-dimensional wound core oil-immersed three-phase distribution transformer in the non-disassembled state according to the X-ray machine layout process and the X-ray film layout process. When taking pictures, the ray flaw detector uses Different X-ray tube voltages irradiate the winding area of the three-dimensional wound core oil-immersed three-phase distribution transformer, and obtain a set of photographed industrial ray films. The winding irradiation area is a corner of any corner winding of the three-dimensional wound core oil-immersed three-phase distribution transformer;

b. Develop, stop, fix, wash, and dry the industrial radiographic film after taking pictures to become a three-dimensional wound core oil-immersed three-phase distribution transformer winding coil image film;

c. According to the blackness measurement method of the three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil X-ray transillumination X-ray film blackness measurement method, the blackness data and position data of the blackness specified measuring point are obtained, and the position data is obtained by three-dimensional wound core oil immersion Three-phase distribution transformer non-disintegrated coil material identification X-ray transillumination transillumination thickness calculation method Calculate the three-dimensional coil core oil-immersed three-phase distribution transformer coil image blackness to specify the X-ray transillumination thickness of the measuring point, calculate and make a three-dimensional coil The common logarithm-transillumination thickness curve of the image blackness of the core oil-immersed three-phase distribution transformer coil;

d. Compare the X-ray different tube voltage ray attenuation coefficient-transillumination thickness curves of the measured three-dimensional wound core oil-immersed three-phase distribution transformer with the X-ray different tube voltage ray attenuation coefficient-transillumination thickness curves of copper and aluminum , respectively calculate the absolute value of 100 times the average slope of these curves, the measured three-dimensional wound core oil-immersed three-phase distribution transformer winding coil curve value is less than the aluminum curve value is aluminum, the measured three-dimensional wound core oil-immersed three-phase power distribution Transformer winding coil curve value greater than 1.0 is copper; to identify the material of the measured three-dimensional wound core oil-immersed three-phase distribution transformer winding coil.

The method for identifying the material of the non-disassembled coil of the three-dimensional wound core oil-immersed three-phase distribution transformer above is that in step a, the X-ray machine is required to be placed, the window of the X-ray machine is vertically downward, and the X-ray film is placed on the three-dimensional wound core oil-immersed third The long axis of the X-ray film is parallel to the window of the X-ray machine under any corner of the winding coil of the matching power transformer; the focal length F from the center line of the X-ray machine to the X-ray film is greater than 700mm; The distance of the outer wall of the winding at the transillumination part of the matching power transformer is calculated by the eccentricity formula. In the calculation of the eccentricity L: the focal length F is the distance from the center line of the X-ray machine to the X-ray film, and the unit is mm; the voltage of the transillumination tube of the X-ray machine is 320kV, the exposure amount is calculated by the exposure amount formula: the exposure amount of the X-ray machine is the X-ray machine tube current multiplied by the time, the unit is mA. Distance: Agfa D4 is used as the X-ray film, and the intensifying screen is a lead foil intensifying screen with 0.15mm front and rear screens.

The method for identifying the non-disintegrated coil material of the aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer is to affix the detection number mark and lead type code on the X-ray film dark bag, and clamp the X-ray film dark bag with the X-ray film holder, and then place the The X-ray film support is attached to the outer wall of the bottom plate of the oil tank under any corner coil of the three-dimensional wound core oil-immersed three-phase distribution transformer, and the X-ray film support and the center line of the film, the center line of the X-ray machine window, and the center line of the X-ray machine are on the same plane Inside, the X-ray film bracket and the film expose the edge of the tank bottom plate by 10-20mm, and the inclined K value measuring device is vertically pasted on the outer wall of the oil tank panel of the selected angle coil of the three-dimensional wound core oil-immersed three-phase distribution transformer, and the inclined K value measuring device is The lead rod is perpendicular to the X-ray film support and is located on the X-ray film support and the film midline, and the lower end of the lead rod of the inclined K value measuring device is against the film dark bag.

The aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification method is that the X-ray film dark bag is 125mm long and 85mm wide, and the front intensifying screen and the rear sensing screen in the dark bag are 0.15mm of 80×120mm Lead foil intensifying screen, the X-ray film between the two intensifying screens is 80×120mm Agfa D4 film, and the X-ray film is covered with a dark bag after it is installed in the darkroom.

The method for identifying the non-disassembled coil material of the aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer is that in step c, the calculation method for the thickness of the X-ray transillumination transillumination is to use the end angle of the three-dimensional wound core oil-immersed three-phase distribution transformer coil cylinder It is close to a right angle to calculate the X-ray transillumination thickness of the winding coil of the three-dimensional wound core oil-immersed three-phase distribution transformer. When performing transillumination, a slope that is convenient for calculating the slope K value should be placed under the center of the X-ray window on the outer wall of the oil tank or the outer wall of the winding insulation. The K value measuring device is equipped with a 6mm×6mm×50mm lead rod on the inclined K value measuring device, and the lower end of the inclined K value measuring device is against the X-ray film; the inclined K value is calculated as, OM is the focus center of the X-ray machine to X-ray film setting plane distance (focal length F), unit mm;

CP is the distance from the end of the lead rod image of the tilted K value measuring device displayed on the X-ray film after being transilluminated to the first measuring point specified for the blackness of the transformer winding image, in mm;

AB is the length of the lead rod of the K value measuring device, in mm;

T is the thickness of the lead rod of the K value measuring device, in mm;

GH-T is the distance from the projection point of the X-ray machine window center on the X-ray film setting plane to the end face of the lead rod of the K value measuring device, or the eccentricity L minus the distance from the outer end face of the lead rod of the K value measuring device to the outer wall of the transformer oil tank Distance, in mm.

After calculating the tilt K value, the X-ray transillumination thickness difference corresponding to the distance between any two points on the coil image on the X-ray film is calculated as: (unit mm), △T is the X-ray transillumination thickness difference; △X is the X-ray The distance between any two points on the coil image on film.

The aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification method is, the three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil X-ray transillumination X-ray film blackness measurement method is, the three-dimensional wound core Oil-immersed three-phase distribution transformer non-disintegrated coil material identification X-ray transillumination X-ray film is placed on the film viewing lamp, and the image of the tilt K value measuring device is found, and the X-ray film is loaded into the film positioning ruler, and the length direction of the film positioning ruler is in the same direction Orient the vertical direction of the coil image, and be located near the blackness measurement area of the X-ray film, fix the film positioning ruler and the film together, and use the film positioning ruler to measure the image end position data of the tilt K value measuring device along the vertical direction of the coil image; use black and white The density meter measures the blackness of the film along the edge of the film positioning ruler, finds the blackness measuring point A with a blackness of 2.10~2.00, records the blackness value of the blackness measuring point A and the position data of the film positioning ruler; finds the blackness of 1.85~ For the blackness measurement point B of 1.75, record the blackness value of the blackness measurement point B and the position data of the film positioning ruler; find the blackness measurement point C with a blackness of 1.65-1.55, record the blackness value of the blackness measurement point C and Position data of film position ruler. .

The aforementioned method for identifying the non-disassembled coil material of the three-dimensional wound core oil-immersed three-phase distribution transformer is that the blackness measurement area of the X-ray film must be selected in the coil image area of the three-dimensional wound core oil-immersed three-phase distribution transformer with a blackness of 1.5 to 2.1 Inside, the three points of blackness measurement must be located on a straight line perpendicular to the tangent of the coil shape.

The aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification method is that in order to facilitate the recording of the blackness measurement position of the X-ray film, the center of the optical measuring head of the black and white density meter must be marked with a vertical thin line.

The aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification method is that the different X-ray tube voltage ray attenuation coefficient-transillumination thickness curves of copper and aluminum are generated by the focal length F=700mm, using X-ray The machine tube voltage is 270kV and 320KV respectively, the exposure is 20mA.min, the X-ray film is Agfa D4 type, the front and rear screens of the intensifying screen are both 0.15mmPb, and the thickness of the equal-thickness steel plate placed on the X-ray film is 10mm and 10mm respectively. 20mm; 10-50mm copper step test block, 10-50mm aluminum step test block, 60-100mm aluminum step test block were transilluminated respectively, and 12 films marked with numbers were obtained. The films were developed in a dark room for 5 minutes and fixed in a dark room for 15 minutes. 12 negatives, each step of the 8 AL step test blocks in the 12 negatives is measured for blackness, and filled in the aluminum transillumination thickness blackness table; each of the 4 Cu step test blocks in the 12 negatives Measure the blackness of the steps, and fill in the copper transillumination thickness blackness table; remove the value of the blackness lower than 0.3 in the aluminum transillumination thickness blackness table and take the common logarithm to generate the common logarithm of the aluminum transillumination thickness blackness Table; the copper transillumination thickness blackness table; the value of the middle blackness lower than 0.3 is removed and the common logarithm is taken to generate the copper transillumination thickness blackness common logarithm table; the aluminum transillumination thickness blackness common logarithm table and The data of the common logarithm table of the blackness of copper transillumination thickness is plotted in a common logarithm of the blackness of copper-aluminum stepped test block X-ray film - transillumination thickness curve, four aluminum X-ray attenuation curves are obtained, and four copper X-rays are obtained Attenuation curve; the four commonly used logarithm-transillumination thickness curves of aluminum blackness are close to a straight line, and the slope is 100 times about -1.0; the four common logarithm-transillumination thickness curves of copper blackness are close to a straight line, and the slope is 100 times About -3.7.

The aforementioned method for identifying the non-disintegrated coil material of the three-dimensional wound core oil-immersed three-phase distribution transformer is that the X-ray film support includes a support plate, and two ends of the support plate are respectively connected with two coils that can be adsorbed on the three-dimensional wound core oil-immersed coil. The magnet sucker on the outer wall of the bottom plate of the oil tank under any corner coil of the three-phase distribution transformer is connected with a lead support plate on the support plate, and a corrosion-reducing plate is connected to the lead support plate through a rope, and the X-ray film hidden bag is placed on the lead support plate After being put on, the corrosion reducing plate presses the right side of the X-ray film dark bag; the composition of the lead supporting plate includes a lead plate, the support plate is connected to the lead plate, and the connection between the lead plate, the lead plate and the support plate is covered with carbon fiber cloth, The carbon fiber cloth is cured in its covered area by resin; the composition of the corrosion reduction plate includes a lead plate, on which the carbon fiber cloth is covered, and the carbon fiber cloth is cured in its covered area by resin.

The aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification method is that the K value measuring device includes a carbon fiber plate, and the two ends of the carbon fiber plate are connected with magnet suckers, and the carbon fiber between the two magnet suckers The center line of the board is connected with a lead rod, and the carbon fiber board is vertically pasted on the outer wall of the coil oil tank panel of the three-dimensional wound iron core oil-immersed three-phase distribution transformer. The lead rod is perpendicular to the X-ray film and is located on the X-ray film centerline. The oil-immersed three-phase distribution transformer with coiled iron core is flush with the bottom plate of the oil tank; the cross-section of the lead rod is square, with a side length of 6mm and a length of 50mm. The cloth and the carbon fiber plate are cured with resin.

The aforementioned three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification method is that it includes a transparent scale, a back sheet is provided below the transparent scale, and the area before the scale 0 of the transparent scale is connected to the end of the back sheet The parts are connected to each other; the back sheet is a transparent scale, and the transparent scale and the scale 0 line of the back sheet coincide with each other; the transparent scale and the back sheet are rulers made of film material.

Compared with the prior art, the present invention uses X-rays to take pictures of the three-dimensional wound core oil-immersed three-phase distribution transformer in a non-disassembled state according to the difference in the attenuation coefficients of copper and aluminum to X-rays, and uses a black-and-white density meter to take pictures. The X-ray negative film blackness measurement, input the measured blackness value into the computer, get the X-ray attenuation coefficient-transillumination thickness curve, through the curve and the different X-ray tube voltage copper, steel, aluminum X-ray attenuation stored in the computer Coefficient-transillumination thickness curves are compared, and the winding coils of three-dimensional wound core oil-immersed three-phase distribution transformers are judged to be aluminum and copper, which has the advantages of saving time, labor, and not damaging equipment. At the same time, due to the ability to quickly inspect the material of the transformer winding coil, the transformer that violates the contract and design and substitutes aluminum for copper can be claimed and replaced in time, reducing the loss of the distribution network transformer.

Description of drawings

Fig. 1 is a transillumination schematic diagram of the present invention;

Fig. 2 is the structural schematic diagram of X-ray film support;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is the structural representation of inclined K value measurer;

Fig. 5 is the top view of inclined K value measurer;

Fig. 6 is the schematic diagram of calculating tilt K value;

Fig. 7 is the commonly used logarithm-transillumination thickness curve of copper-aluminum step test block X-ray film blackness;

Fig. 8 is a structural schematic diagram of the film positioning ruler.

Detailed ways

Embodiment, as shown in Figure 1, since the iron core and coils of the three-dimensional wound core oil-immersed three-phase distribution transformer are arranged in a triangular structure, the X-rays of the portable X-ray flaw detector below 350kV cannot penetrate the three-dimensional wound core oil-immersed three-phase from the top and bottom Even if the X-rays pass through the winding coil of the matching power transformer in the tangential direction of the winding coil circle, due to the determination of the shape and size of the penetrating coil, the X-ray penetration thickness of the winding coil cannot be calculated, and the coil material identification cannot be carried out. 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 three-dimensional wound core oil-immersed three-phase distribution transformer The non-destructive identification method of the non-disintegrated coil material and the identification method of the X-ray attenuation law of copper and aluminum in the airtight container can be used to identify the coil material. The following is the specific identification method. The method includes the following steps:

a. Use the X-ray machine and X-ray film to take pictures of the tested three-dimensional wound core oil-immersed three-phase distribution transformer in the non-disassembled state. When taking pictures, the ray flaw detector uses different X-ray tube voltages to irradiate the tested three-dimensional wound core The oil-immersed three-phase distribution transformer has a winding area, and a set of photographed industrial radiography films is obtained. The winding irradiation area is a corner of any corner winding of the transformer;

In step a, the placement requirements of the X-ray machine are as follows: the window of the X-ray machine is vertically downward, and the X-ray film is placed under any corner winding coil of the three-dimensional wound core oil-immersed three-phase distribution transformer. The windows are parallel; the distance from the center line of the X-ray machine to the X-ray film is greater than 700mm and less than 900mm; the distance from the center of the X-ray machine window to the outer wall of the transilluminated part of the winding of the three-dimensional wound core oil-immersed three-phase distribution transformer is calculated by the eccentricity formula, The calculation of the eccentricity L is: the focal length F is the distance from the center line of the X-ray machine to the X-ray film, the unit is mm; the voltage of the transillumination tube of the X-ray machine is 320kV, and the exposure amount is calculated by the exposure amount formula, and the exposure amount of the X-ray machine is X X-ray machine tube current multiplied by time, the unit is mA.min (milliampere.min), focal length F is the distance from the X-ray machine center line to the X-ray film; the X-ray film is Agfa D4, and the intensifying screen is the front and rear screens Both are 0.15mm lead foil intensifying screens.

The X-ray film placement requirements are as follows: the detection number mark and lead code are pasted on the X-ray film dark bag, the X-ray film dark bag is clamped with the X-ray film holder, and then the X-ray film holder is pasted under any corner coil of the distribution transformer The outer wall of the fuel tank bottom plate, and ensure that the X-ray film bracket and the center line of the film, the center line of the X-ray machine window, and the center line of the X-ray machine are in the same plane, and that the X-ray film bracket and the film expose the edge of the fuel tank bottom plate (or edge) by 10-20mm, Stick the inclined K value measuring device vertically on the outer wall of the oil tank panel of the selected angle coil of the three-dimensional wound iron core oil-immersed three-phase distribution transformer, and the lead rod of the inclined K value measuring device is perpendicular to the X-ray film support and is located on the X-ray film support and the film centerline , tilt the lower end of the lead rod of the K value measuring device against the film dark bag. The length of the X-ray film dark bag is 125mm, and the width is 85mm. The front intensifying screen and the rear intensifying screen in the dark bag are both 0.15mm lead foil intensifying screens of 80×120mm, and the X-ray film between the two intensifying screens is 80×120mm Agfa D4 film and X-ray film are covered with a dark bag after they are installed in the darkroom.

The X-ray film bracket is used to fix the X-ray film on the outer wall of the bottom plate of the oil tank under any corner coil of the three-dimensional wound iron core oil-immersed three-phase distribution transformer. Its specific structure is shown in 2 and 3. The support plate 1 is installed on the On the two magnetic suckers 2, the specification of the support plate is 20×1.5×150mm carbon fiber slats. The diameter of the magnet sucker 2 is 30mm, the thickness is 11mm, and there is an M3 screw hole in the center of the back; the lead support plate 3 is installed on the support plate 1, and the lead support plate 3 is made of a 90×2×120mm lead plate and carbon fiber cloth. The lead plate is wrapped, and then the carbon fiber cloth wrapping the lead plate is cured with resin to form a lead pallet, the support plate 1 and the lead pallet 3 are wrapped together with carbon fiber cloth, and then the resin carbon fiber cloth is cured. Corrosion reduction plate 4 is connected to the lead supporting plate by two 25mm wide and 2mm thick polypropylene ribbons. The corrosion reduction plate 4 is made of 20×1×120mm lead plate and carbon fiber cloth. The carbon fiber cloth wraps the lead plate and then wraps it with resin. The carbon fiber cloth wrapping the lead plate is solidified to form the corrosion-reducing plate 4, and then two 25mm wide and 2mm thick polypropylene webbings are connected to the lead supporting plate with resin. . When patching, the X-ray film dark bag is placed in the X-ray film holder, the X-ray film dark bag is aligned with the X-ray film holder back plate, and the X-ray film dark bag is pasted with the typeface facing up (towards the direction of the X-ray machine), The erosion plate presses the right side of the X-ray film pocket.

The structure of the inclined K value measuring device is shown in Figures 4, 5 and 6. The three-dimensional wound core oil-immersed three-phase distribution transformer coil material is identified. The X-ray transilluminated inclined K value measuring device includes a carbon fiber plate 5 and a carbon fiber plate 5 There are magnet suckers 6 connected to both ends of the measuring magnet suckers 6, and a lead rod 7 is connected to the center line of the carbon fiber plate 5 between the measuring magnet suckers 6. The carbon fiber plate 5 is vertically pasted on the three-dimensional wound core oil-immersed three-phase distribution transformer coil oil tank panel On the outer wall, the lead rod 7 is perpendicular to the X-ray film and is located on the center line of the X-ray film, and the lower end of the lead rod 7 is flush with the oil tank bottom plate of the three-dimensional wound iron core oil-immersed three-phase distribution transformer. The width of the carbon fiber plate 5 is 20 mm, the thickness is 1.5 mm, and the length is 150 mm. Lead rod 7 section is square, and length is 6mm, length 50mm, is wrapped with fiber cloth outside lead rod 7 and carbon fiber plate 5, and fiber cloth and lead rod 7 are solidified with resin, between fiber cloth and carbon fiber plate 5, are cured with resin.

Described film positioning ruler, it comprises transparent scale 8, is provided with back sheet 9 below transparent scale 8, and the end portion of back sheet 9 is interconnected with the area before the scale 0 of transparent scale 8; Described back Sheet 9 is a transparent scale, and the scale 0 line of transparent scale 8 and back sheet 9 coincides with each other; transparent scale 8 and back sheet 9 are rulers made of film material.

b. Develop, stop, fix, wash, and dry the industrial radiographic film after taking pictures to become a three-dimensional wound core oil-immersed three-phase distribution transformer winding coil image film;

c. According to the blackness measurement method of three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil X-ray transillumination X-ray film blackness measurement method, the results use the three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material Differentiate the calculation method of X-ray transillumination and transillumination thickness Calculate the image blackness and X-ray transillumination transillumination thickness of three-dimensional wound core oil-immersed three-phase distribution transformer coil, calculate and make three-dimensional wound core oil-immersed three-phase distribution transformer coil image The logarithm-transillumination thickness curve is commonly used for blackness, and 100 times the average slope of the curve is calculated.

In step c, the X-ray transillumination thickness calculation method is to use the three-dimensional wound core oil-immersed three-phase distribution transformer coil cylinder end angle to be close to a right angle to calculate the X-ray transmission of the three-dimensional wound core oil-immersed three-phase distribution transformer winding coil According to the thickness, when performing transillumination, a tilt K value measuring device that is convenient for calculating the tilt K value should be placed under the center of the X-ray window on the outer wall of the fuel tank or the insulating outer wall of the winding. Lead rod, the lower end of the inclined K value measuring device is against the X-ray film; its inclined K value, OM is the distance from the focus center of the X-ray machine to the setting plane of the X-ray film (focal length F), the unit is mm;

CP is the distance from the end of the lead rod image of the tilted K value measuring device displayed on the X-ray film after being transilluminated to the first measuring point specified for the blackness of the transformer winding image, in mm;

AB is the length of the lead rod of the K value measuring device, in mm;

T is the thickness of the lead rod of the K value measuring device, in mm;

GH-T is the distance from the projection point of the X-ray machine window center on the X-ray film setting plane to the end face of the lead rod of the K value measuring device, or the eccentricity L minus the distance from the outer end face of the lead rod of the K value measuring device to the outer wall of the transformer oil tank Distance, in mm.

The calculation process of tilt K value is as follows:

On the X-ray film, C' is the projection of point A of the tilt K value measuring device, point P is the first measurement point of blackness, point N is the second or third measurement point of blackness, and T is the tilt K value The thickness (side length) of the measuring device, then the inclination K value of point P is:

In the right triangle OMP, and because ΔOMC is similar to ΔABC', in order to eliminate the influence of the thickness of the inclined K value measuring device on the actual influence error, after calculating the inclined K value, the distance between any two points on the coil image on the X-ray film The corresponding X-ray transillumination thickness difference is calculated as: (unit mm), △T is the X-ray transillumination thickness difference; △X is the distance between any two points on the coil image on the X-ray film.

Three-dimensional wound core oil-immersed three-phase distribution transformer X-ray transillumination X-ray film blackness measurement method is to put three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification X-ray transillumination X-ray film on the viewing film On the lamp, find the image of the tilted K-value measuring device. Put the X-ray film into the film positioning ruler. Fix them together, use the film positioning ruler to measure the position data of the image end of the tilt K value measuring device along the vertical direction of the coil image; use a black and white densitometer to measure the blackness of the film along the edge of the film positioning ruler, and find the blackness of 2.10 to 2.00 Measuring point A, record the blackness value of blackness measuring point A and the position data of the film positioning ruler; find the blackness measuring point B with a blackness of 1.85~1.75, record the blackness value of blackness measuring point B and the position of the film positioning ruler Data; find the blackness measurement point C with a blackness of 1.65 to 1.55, and record the blackness value of the blackness measurement point C and the position data of the film positioning ruler. the

The X-ray film blackness measurement area must be selected in the image area of the three-dimensional wound core oil-immersed three-phase distribution transformer coil with a blackness of 1.5 to 4.5. The three points of the blackness measurement are located on a straight line perpendicular to the tangent of the coil shape.

d. Compare the different X-ray tube voltage ray attenuation coefficient-transillumination thickness curves of the measured three-dimensional wound core oil-immersed three-phase distribution transformer with the different X-ray tube voltage ray attenuation coefficient-transillumination thickness curves of copper and aluminum , the value is close to -1.0, the coil is aluminum, and the value is close to -3.7, the coil is copper; to identify the material of the measured three-dimensional wound core oil-immersed three-phase distribution transformer winding coil.

The generation method of different X-ray tube voltage ray attenuation coefficient-transillumination thickness curves of copper and aluminum is that the focal length F=700mm, the X-ray machine tube voltage is 270kV and 320KV, the exposure is 20mA.min, and the X-ray film loves Kefa D4 type, the front and rear screens of the intensifying screen are both 0.15mmPb, and the thickness of the equal-thickness steel plates placed on the X-ray film is 10mm and 20mm respectively; the copper ladder test block of 10-50mm and the aluminum ladder test block of 10-50mm are transilluminated respectively , 60 ~ 100mm aluminum ladder test block, get 12 films marked with numbers, 12 negatives obtained after the film was developed in the dark room for 5 minutes, and fixed in the dark room for 15 minutes, and each step of 8 AL ladder test blocks in the 12 negatives Carry out the blackness measurement, and fill in the aluminum transillumination thickness blackness table; measure the blackness of each step of the 4 Cu step test blocks in the 12 negatives, and fill in the copper transillumination thickness blackness table; Take the common logarithm after removing the value of the blackness lower than 0.3 in the thickness blackness table, and generate the common logarithm table of the thickness blackness of aluminum transillumination; the thickness blackness table of copper transillumination; the value of blackness lower than 0.3 After removal, the common logarithm is taken to generate the common logarithm table of the thickness and blackness of the copper transillumination; the data of the common logarithm table of the thickness and blackness of the aluminum transillumination and the common logarithm table of the thickness and blackness of the copper transillumination are drawn on a copper-aluminum ladder In the common logarithm-transillumination thickness curve of the X-ray film blackness of the test block, four aluminum X-ray attenuation curves are obtained, and four copper X-ray attenuation curves are obtained; the four aluminum blackness common logarithm-transillumination thickness curves are close to a straight line , respectively calculate the absolute value of 100 times the average slope of these curves, the measured three-dimensional wound core oil-immersed three-phase distribution transformer winding coil curve value is less than the aluminum curve value is aluminum, the measured three-dimensional wound core oil-immersed three-phase power distribution Transformer winding coil curve value greater than 1.0 is copper; to identify the material of the measured three-dimensional wound core oil-immersed three-phase distribution transformer winding coil.

The specific process is

1. Laboratory copper and aluminum X-ray attenuation coefficient transillumination process I: X-ray transillumination is shown in Figure 7, focal length F=700mm, X-ray machine tube voltage is 270kV, exposure is 20mA.min, X-ray film Agfa D4 type, the front and rear screens of the intensifying screen are 0.15mmPb, and the thickness of the equal-thickness steel plate is 10mm.

2. Laboratory copper and aluminum X-ray attenuation coefficient transillumination process II: X-ray transillumination is shown in Figure 7, focal length F=700mm, X-ray machine tube voltage is 270kV, exposure is 20mA.min, X-ray film Agfa D4 type, the front and rear screens of the intensifying screen are 0.15mmPb, and the thickness of the equal-thickness steel plate is 20mm.

3. Laboratory copper and aluminum X-ray attenuation coefficient transillumination process III: X-ray transillumination is shown in Figure 7, focal length F=700mm, X-ray machine tube voltage is 320kV, exposure is 20mA.min, X-ray film Agfa D4 type, the front and rear screens of the intensifying screen are 0.15mmPb, and the thickness of the equal-thickness steel plate is 10mm.

4. Laboratory copper and aluminum X-ray attenuation coefficient transillumination process IV: X-ray transillumination is shown in Figure 7, focal length F=700mm, X-ray machine tube voltage is 320kV, exposure is 20mA.min, X-ray film Agfa D4 type, the front and rear screens of the intensifying screen are 0.15mmPb, and the thickness of the equal-thickness steel plate is 20mm.

5. Use the transillumination process I to transilluminate a group of 10-50mm copper ladder test blocks in the laboratory. The X-ray film number is 270kVFe10Cu10-50, and the number of the negative film obtained after darkroom development for 5min and darkroom fixation for 15min is 270kVFe10Cu10-50.

6. Use Transillumination Industry III to transilluminate a group of 10-50mm copper ladder test blocks in the laboratory. The X-ray film number is 320kVFe10Cu10-50, and the number of the negative film obtained after darkroom development for 5min and darkroom fixation for 15min is 320kVFe10Cu10-50.

7. Use the transillumination process II to transilluminate a group of 10-50mm copper ladder test blocks in the laboratory. The X-ray film number is 270kVFe20Cu10-50, and the number of the negative film obtained after darkroom development for 5 minutes and darkroom fixation for 15 minutes is 270kVFe20Cu10-50.

8. Use the transillumination process IV to transilluminate a group of 10-50mm copper ladder test blocks in the laboratory. The X-ray film number is 320kVFe20Cu10-50, and the negative film number obtained after darkroom development for 5min and darkroom fixation for 15min is 320kVFe20Cu10-50.

9. Use the transillumination process I to transilluminate a group of 10-50mm aluminum ladder test blocks in the laboratory. The X-ray film number is 270kVFe10Al10-50, and the number of the negative film obtained after darkroom development for 5 minutes and darkroom fixation for 15 minutes is 270kVFe10Al10-50.

10. Use the transillumination process I to transilluminate a group of 60-100mm aluminum ladder test blocks in the laboratory. The X-ray film number is 270kVFe10Al60-100, and the number of the negative film obtained after darkroom development for 5min and darkroom fixation for 15min is 270kVFe10Al60-100.

11. Use Transillumination Industry III to transilluminate a group of 10-50mm aluminum ladder test blocks in the laboratory. The X-ray film number is 320kVFe10Al10-50, and the negative film number obtained after darkroom development for 5 minutes and darkroom fixation for 15 minutes is 320kVFe10Al10-50.

12. Use Transillumination Industry III to transilluminate a group of 60-100mm aluminum ladder test blocks in the laboratory. The X-ray film number is 320kVFe10Al60-100, and the number of the negative film obtained after darkroom development for 5min and darkroom fixation for 15min is 320kVFe10Al60-100.

13. Use the transillumination process II to transilluminate a group of 10-50mm aluminum ladder test blocks in the laboratory. The X-ray film number is 270kVFe20Al10-50, and the number of the negative film obtained after darkroom development for 5min and darkroom fixation for 15min is .

14. Use the transillumination process II to transilluminate a group of 60-100mm aluminum ladder test blocks in the laboratory. The X-ray film number is 270kVFe20Al60-100, and the number of the negative film obtained after darkroom development for 5min and darkroom fixation for 15min is 270kVFe20Al60-100.

15. Use the transillumination process IV to transilluminate a group of 10-50mm aluminum ladder test blocks in the laboratory. The X-ray film number is 320kVFe20Al10-50, and the number of the negative film obtained after darkroom development for 5min and darkroom fixation for 15min is 320kVFe20Al10-50.

16. Use the transillumination process IV to transilluminate a group of 60-100mm aluminum ladder test blocks in the laboratory. The X-ray film number is 320kVFe20Al60-100. After developing in the darkroom for 5min and fixing in the darkroom for 15min, the negative film number is 320kVFe20Al60-100.

17. Using a black-and-white densitometer, the steps of V, Fe20Al10-50, 270kVFe20Al60-100, 320kVFe20Al10Al10-50, Measure the blackness and fill in the aluminum transillumination thickness blackness table (Table 1).

18. Using a black and white densitometer, measure the blackness of each step of the ladder test block image negative film 270kVFe10Cu10-50, 320kVFe10Cu10-50, 270kVFe20Cu10-50, 320kVFe20Cu10-50, and fill in the copper transillumination thickness blackness table (Table 2).

19. Remove the value of the blackness lower than 0.3 in the aluminum transillumination thickness blackness table (Table 1) and take the common logarithm to generate the aluminum transillumination thickness blackness common logarithm table (Table 3).

20. Remove the value of the blackness lower than 0.3 in the copper transillumination thickness blackness table (Table 2) and take the common logarithm to generate the copper transillumination thickness blackness common logarithm table (Table 4).

21. Draw the data of the common logarithm table of aluminum transillumination thickness blackness (Table 3) and the copper transillumination thickness blackness common logarithm table (Table 4) on a copper-aluminum ladder test block X-ray film blackness common logarithm In the number-transillumination thickness curve (Figure 8), four aluminum X-ray attenuation curves of 270kVFe10Al, 270kVFe20Al, 320kVFe10Al, and 320kVFe20Al are obtained, and four copper X-ray attenuation curves of 270kVFe10Cu, 270kVFe20Cu, 320kVFe10Cu, and 320kVFe20Cu are obtained. The four common logarithm-transillumination thickness curves of aluminum blackness in the figure are close to a straight line, and the slope of 100 times is about -1.0; The times are about -3.7.

22. In the actual non-destructive testing of the coil material identification of the three-dimensional wound core oil-immersed three-phase distribution transformer, first use the X-ray transillumination method to identify the non-disintegrated coil material of the three-dimensional wound iron core oil-immersed three-phase distribution transformer. Iron core oil-immersed three-phase distribution transformer coil image film, and then according to the three-dimensional wound core oil-immersed three-phase distribution transformer non-disintegrated coil material identification X-ray transillumination transillumination thickness calculation method, three-dimensional wound iron core oil-immersed three-phase distribution transformer Disassembled coil X-ray transillumination X-ray film blackness measurement method Measure and calculate the blackness of the three-dimensional wound core oil-immersed three-phase distribution transformer coil image blackness and X-ray transillumination thickness, calculate and make the three-dimensional wound core oil-immersed three-phase The logarithmic-transillumination thickness curve is commonly used for the image blackness of distribution transformer coils, and the average slope of the curve is calculated 100 times. If the value is close to -1.0, the coil is aluminum, and if the value is close to -3.7, the coil is copper.

Table 1. Aluminum transillumination thickness blackness table

Table 2. Blackness table of copper transillumination thickness

Table 3. Commonly used logarithmic table of aluminum transillumination thickness blackness

Table 4. Copper transillumination thickness blackness common logarithm table

Claims (12)

1. a three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method, it is for three dimensional wound core oil immersion Three-Phase Distribution Transformers, the winding coil of three dimensional wound core oil immersion Three-Phase Distribution Transformers is triangularly arranged, have lower margin joist steel at oil tank bottom plate, it is characterized in that: the method comprises the following steps

A, utilize X-ray production apparatus and X-ray film, according to X-ray production apparatus arrangement technology, X-ray film arrangement technology, the non-three dimensional wound core oil immersion Three-Phase Distribution Transformers disassembled under state is taken pictures, when taking pictures, ray inspection machine adopts different x-ray tube voltage to irradiate three dimensional wound core oil immersion Three-Phase Distribution Transformers winding area, obtain one group of postindustrial radiographic film of taking pictures, this winding irradiation area is one jiao of three dimensional wound core oil immersion Three-Phase Distribution Transformers arbitrary angle winding;

B, postindustrial radiographic film of taking pictures carry out developing, stop shadow, fixing, washing, drying and processing become three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil image egative film;

C, draw blackness regulation measuring point blackness data and position data according to three dimensional wound core oil immersion Three-Phase Distribution Transformers non-solution body coil X ray transillumination x-ray film density measurement method, its position data utilizes three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discriminating X ray transillumination scanning thickness computing method to calculate the X ray scanning thickness that three dimensional wound core oil immersion Three-Phase Distribution Transformers coil image blackness specifies measuring point, calculates and makes three dimensional wound core oil immersion Three-Phase Distribution Transformers coil image blackness common logarithm-scanning thickness curve;

D, different for tested three dimensional wound core oil immersion Three-Phase Distribution Transformers X ray tube voltage attenuation coefficient-scanning thickness curve to be compared from the different tube voltage attenuation coefficient-scanning thickness curve of X ray of copper and aluminium respectively, obtain the absolute value of 100 times of these curve average gradients respectively, it is then aluminium that tested three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil curve values is less than aluminium curve values, and tested three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil curve values is greater than 1.0 for copper; To differentiate the material of tested three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil.

2. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 1 non-disintegration texture of coil discrimination method, it is characterized in that: in step a, X-ray production apparatus placement requirement is, X-ray production apparatus window vertically downward, X-ray film is placed on below winding coil position, three dimensional wound core oil immersion Three-Phase Distribution Transformers arbitrary angle, and X-ray film major axis is parallel with X-ray production apparatus window; X-ray production apparatus center line is greater than 700mm to the focal length F of X-ray film; X-ray production apparatus window center to the distance of three dimensional wound core oil immersion Three-Phase Distribution Transformers transillumination position winding outer wall by eccentric throw formulae discovery, in the calculating of eccentric throw L: focal length F is the distance of X-ray production apparatus center line to X-ray film, and unit is mm; X-ray production apparatus transillumination tube voltage is 320kV, and exposure is by exposure formulae discovery: X-ray production apparatus exposure is that X-ray production apparatus tube current is multiplied by the time, unit be mA.min (milliampere. point), focal length F is the distance of X-ray production apparatus center line to X-ray film; X-ray film is selected and is liked a gram D4, and intensifying screen shields the lead foil screen being 0.15mm before and after being.

3. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 1 non-disintegration texture of coil discrimination method, it is characterized in that: post on X-ray film camera bag and detect numbering mark lead word number, X-ray film camera bag X-ray film support clips, then X-ray film support is affixed on three dimensional wound core oil immersion Three-Phase Distribution Transformers arbitrary linea angulata circle lower fuel tank base plate outer wall, and guarantee X-ray film support and film center line, X-ray production apparatus window center line, X-ray production apparatus center line is in same plane, X-ray film support and film expose oil tank bottom plate edge 10-20mm, inclination K value measuring appliance is vertically attached to three dimensional wound core oil immersion Three-Phase Distribution Transformers and selectes linea angulata circle fuel tank panel outer wall, the lead rod of inclination K value measuring appliance is perpendicular to X-ray film support and be positioned at X-ray film support and film center line, the lead rod lower end of inclination K value measuring appliance props up film camera bag.

4. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 3 non-disintegration texture of coil discrimination method, it is characterized in that: the long 125mm of X-ray film camera bag, wide 85mm, in camera bag, front intensifying screen and rear sense screen are the 0.15mm lead foil screen of 80 × 120mm, X-ray film between two intensifying screens is that 80 × 120mm likes a gram D4 film, and X-ray film is built with camera bag lid after darkroom installs.

5. according to the three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method that claim 1 is stated, it is characterized in that: in step c, X ray transillumination scanning thickness computing method utilize the nearly right angle of three dimensional wound core oil immersion Three-Phase Distribution Transformers coil cylindrical shell end corner connection to calculate the X ray scanning thickness of three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil, when carrying out transillumination, the inclination K value measuring appliance that one is convenient to calculate inclination K value should be placed under fuel tank outer wall or winding insulation outer wall X-ray window center, inclination K value measuring appliance is provided with the lead rod of 6mm × 6mm × 50mm, inclination K value measuring appliance lower end props up X-ray film, its inclination K value is calculated as, and OM is that X-ray production apparatus focus center arranges the distance (focal length F) of plane to X-ray film, unit mm,

CP is the distance being specified first measuring point by the inclination K value measuring appliance lead rod image end that is presented at after transillumination on X-ray film to Transformer Winding image blackness, unit mm;

AB is the length of K value measuring appliance lead rod, unit mm;

T is the thickness of K value measuring appliance lead rod, unit mm;

GH-T is that X-ray production apparatus window center arranges the distance of the subpoint in plane to K value measuring appliance lead rod end face at X-ray film, or deducts the distance of K value measuring appliance lead rod outer face to transformer oil box outer wall, unit mm for eccentric throw L;

After calculating inclination K value, the X ray scanning thickness that on X-ray film, on coil image, the distance of any two points is corresponding calculates difference and is: (unit mm), and △ T is that X ray scanning thickness is poor; △ X is the distance of any two points on coil image on X-ray film.

6. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 1 non-disintegration texture of coil discrimination method, it is characterized in that: three dimensional wound core oil immersion Three-Phase Distribution Transformers non-solution body coil X ray transillumination x-ray film density measurement method is, non-for three dimensional wound core oil immersion Three-Phase Distribution Transformers disintegration texture of coil is differentiated X ray transillumination x-ray film is put on viewbox, find inclination K value measuring appliance image, x-ray film loads in egative film positioning rule, egative film positioning rule length direction is along coil image vertical direction, and be positioned at x-ray film density measurement areas adjacent, egative film positioning rule and egative film are fixed together, inclination K value measuring appliance image terminal position data are measured along coil image vertical direction by egative film positioning rule, use black and white densitometer along egative film positioning rule edge metering photographic density, find blackness be 2.10 ~ 2.00 density measurement point A, the blackness value of record density measurement point A and egative film positioning rule position data, find blackness be 1.85 ~ 1.75 density measurement point B, the blackness value of record density measurement point B and egative film positioning rule position data, find blackness be 1.65 ~ 1.55 density measurement point C, the blackness value of record density measurement point C and egative film positioning rule position data.

7. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 6 non-disintegration texture of coil discrimination method, it is characterized in that: it is that in the three dimensional wound core oil immersion Three-Phase Distribution Transformers coil imagery zone of 1.5 ~ 2.1, three one of density measurement is positioned on the straight line perpendicular to coil shape tangent line that x-ray film density measurement region must be chosen to be at blackness.

8. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 6 non-disintegration texture of coil discrimination method, it is characterized in that: for the ease of the record of x-ray film density measurement position, a Thin vertical lines mark must be made in the optical measuring head center of the intensive meter of black and white.

9. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 1 non-disintegration texture of coil discrimination method; it is characterized in that: the generation method of the different x-ray tube voltage attenuation coefficient-scanning thickness curve of copper and aluminium is; focal length F=700mm; X-ray production apparatus tube voltage is adopted to be respectively 270kV and 320KV; exposure is 20mA.min; X-ray film likes a gram D4 type; before and after intensifying screen, screen is 0.15mmPb, and the uniform thickness steel plate thickness be placed on X-ray film adopts 10mm and 20mm respectively; The step bar of transillumination 10 ~ 50mm copper, the test block of 10 ~ 50mm aluminum step wedge or ladder, the test block of 60 ~ 100mm aluminum step wedge or ladder respectively, obtain 12 films born serial numbers, 12 egative films of film through obtaining after scotography 5min, the fixing 15min in darkroom, each ladder of 8 AL step bars in 12 egative films is carried out density measurement, and inserts aluminium scanning thickness blackness table; Each ladder of 4 Cu step bars in 12 egative films is carried out density measurement, and inserts copper scanning thickness blackness table; By blackness in aluminium scanning thickness blackness table lower than 0.3 value remove after get common logarithm, generate aluminium scanning thickness blackness common logarithm table; By copper scanning thickness blackness table; Middle blackness lower than 0.3 value remove after get common logarithm, generate copper scanning thickness blackness common logarithm table; By the Plotting data of aluminium scanning thickness blackness common logarithm table and copper scanning thickness blackness common logarithm table in a copper aluminum step wedge or ladder test block x-ray film blackness common logarithm-scanning thickness curve map, obtain four aluminium X-ray attenuation curves, obtain four flat copper X-ray attenuation curves; Article four, the blackness common logarithm-scanning thickness curve of aluminium is close to straight line, and 100 times of slope are about-1.0; Blackness common logarithm-scanning thickness the curve of four flat coppers is close to straight line, and 100 times of slope are about-3.7.

10. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 3 non-disintegration texture of coil discrimination method, it is characterized in that: described X-ray film support comprises back up pad (1), the magnet sucking disc (2) that two can be adsorbed on three dimensional wound core oil immersion Three-Phase Distribution Transformers arbitrary linea angulata circle lower fuel tank base plate outer wall is connected at the two ends of back up pad (1), back up pad (2) is connected with plumbous supporting plate (3), plumbous supporting plate (3) is connected with corrosion inhibitor plate (4) by rope band, X-ray film camera bag is placed on after on plumbous supporting plate (3), corrosion inhibitor plate (4) is pushed down on the right of X-ray film camera bag, the formation of plumbous supporting plate (3) comprises stereotype, and back up pad (1) is connected on stereotype, is coated with carbon cloth in the junction of stereotype, stereotype and back up pad (1), carbon cloth by resin solidification in its overlay area, the formation of corrosion inhibitor plate (4) comprises stereotype, and stereotype is covered with carbon cloth, carbon cloth by resin solidification in its overlay area.

11. three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination methods according to claim 3 or 5, it is characterized in that: described K value measuring appliance comprises carbon fiber board (5), magnet sucking disc (6) is connected with at the two ends of carbon fiber board (5), the position of center line of the carbon fiber board (5) between two magnet sucking discs (6) is connected with lead rod (7), carbon fiber board (5) is vertically attached to three dimensional wound core oil immersion Three-Phase Distribution Transformers coil fuel tank panel plate outer wall, lead rod (7) is perpendicular to X-ray film and be positioned at X-ray film center line, lead rod (7) lower end flushes with three dimensional wound core oil immersion Three-Phase Distribution Transformers oil tank bottom plate, lead rod (7) cross section is square, and the length of side is 6mm, length 50mm, is wrapped with fiber cloth at lead rod (7) and carbon fiber board (5), and fiber cloth and lead rod (7) resin solidification, use resin solidification between fiber cloth and carbon fiber board (5).

12. three dimensional wound core oil immersion Three-Phase Distribution Transformers according to claim 6 non-disintegration texture of coil discrimination method, it is characterized in that: it comprises transparent scale chi (1), be provided with tergite (9) in the below of transparent scale chi (8), the forefoot area of the scale 0 of transparent scale chi (8) and the end of tergite (9) are interconnected; Described tergite (9) is transparent rule, and transparent scale chi (8) overlaps with scale 0 line of tergite (9); Transparent scale chi (8) and tergite (9) are the ruler obtained by film material.