CN104502369A - Three dimensional wound core oil immersed three-phase distribution transformer non-disassembly coil material identification method - Google Patents
Three dimensional wound core oil immersed three-phase distribution transformer non-disassembly coil material identification method Download PDFInfo
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Abstract
The invention discloses a three dimensional wound core oil immersed three-phase distribution transformer non-disassembly coil material identification method. According to the difference between the attenuation coefficients of copper, steel and aluminum to X ray, the X ray is employed to photograph a three dimensional wound core oil immersed 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 perform 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 three dimensional wound core oil immersed three-phase distribution transformer is aluminum or copper.
Description
Technical field
The present invention relates to a kind of three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method, belong to technical field of electric power transmission.
Background technology
Under existing market economy, some short-sighted electrical network network distribution transformer manufacturer is in order to chase larger profit, aluminium enamel-covered wire is used to replace copper enameled wire as transformer coli winding, excessive and the coil impedance of winding volume is caused to increase, transformer power consumption is increased, increase power supply cost, have a strong impact on the interests of power supply enterprise.Because transformer coli winding has insulation course to wrap up, even if at present under transformer disintegration and non-destructive situation, still cannot be differentiated texture of coil by electrical test and range estimation, unless carried out destruction sampling to coil to carry out metallochemistry analysis, but this destructive test can not be undertaken by platform, otherwise cost is huge, and to transformer stoppage in transit maintenance, have a strong impact on mains supply and social production orders of life.
Therefore, a kind ofly when non-disintegration, network distribution transformer texture of coil is differentiated it is the method that power grid enterprises are dreamed of.
Applicant on October 25th, 2012 to State Intellectual Property Office applied for patent name for "
non-destructive identification method for material of integral coil of distribution transformer ", application number isthe patent of invention of 201210252278, applicant substantially describes the design in early stage in that patent, but in follow-up process of the test, find that such scheme also exists the perfect details of more needs.
The widespread use in the power distribution network of town and country of three dimensional wound core oil immersion Three-Phase Distribution Transformers, such oil tank of transformer cylinder triangular in shape, outward appearance is as Fig. 1, and iron core, coil, transformer wet goods are sealed in fuel tank, and the non-disintegration of transformer can not see profile and the size of iron core and coil.Non-disintegration and failure discriminating to be carried out to three dimensional wound core oil immersion Three-Phase Distribution Transformers texture of coil, oil tank of transformer, the X ray arrangement of coil winding and transillumination technology must be solved.
Summary of the invention
The technical problem to be solved in the present invention is, there is provided a kind of three dimensional wound core oil immersion Three-Phase Distribution Transformers when not disintegrating, the method of qualification three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil material of being taken pictures by X ray, can overcome the deficiencies in the prior art.
Technical scheme of the present invention is: 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, three dimensional wound core oil immersion Three-Phase Distribution Transformers three-phase windings coil is triangularly arranged, and 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.
Above-mentioned three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, 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.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, X-ray film camera bag posts and detects 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 the fuel tank panel outer wall that three dimensional wound core oil immersion Three-Phase Distribution Transformers selectes linea angulata circle, 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.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, 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.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, 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 difference that on X-ray film, on coil image, the distance of any two points is corresponding is calculated as: (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.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, 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.。
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, 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.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, 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.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is; 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, and 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.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, described X-ray film support comprises back up pad, the magnet sucking disc 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, be connected with plumbous supporting plate on the supporting plate, plumbous supporting plate is connected with corrosion inhibitor plate by rope band, X-ray film camera bag is placed on after on plumbous supporting plate, and corrosion inhibitor plate is pushed down on the right of X-ray film camera bag; The formation of plumbous supporting plate comprises stereotype, and back up pad is connected on stereotype, is coated with carbon cloth in the junction of stereotype, stereotype and back up pad, carbon cloth by resin solidification in its overlay area; The formation of corrosion inhibitor plate comprises stereotype, and stereotype is covered with carbon cloth, carbon cloth by resin solidification in its overlay area.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is, described K value measuring appliance comprises carbon fiber board, magnet sucking disc is connected with at the two ends of carbon fiber board, the position of center line of the carbon fiber board between two magnet sucking discs is connected with lead rod, carbon fiber board is vertically attached to three dimensional wound core oil immersion Three-Phase Distribution Transformers coil fuel tank panel plate outer wall, lead rod is perpendicular to X-ray film and be positioned at X-ray film center line, and lead rod lower end flushes with three dimensional wound core oil immersion Three-Phase Distribution Transformers oil tank bottom plate; Lead rod cross section is square, and the length of side is 6mm, length 50mm, is wrapped with fiber cloth at lead rod and carbon fiber board, and fiber cloth and lead rod resin solidification, use resin solidification between fiber cloth and carbon fiber board.
Aforesaid three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil discrimination method is that it comprises transparent scale chi, is provided with tergite in the below of transparent scale chi, and the forefoot area of scale 0 and the end of tergite of transparent scale chi are interconnected; Described tergite is transparent rule, and scale 0 line of transparent scale chi and tergite overlaps; Transparent scale chi and tergite are the ruler obtained by film material.
Compared with the prior art, the present invention is according to copper, aluminium is to the difference of the attenuation coefficient of X ray, X ray is utilized to take pictures to the non-three dimensional wound core oil immersion Three-Phase Distribution Transformers disassembled under state, use black and white densitometer to the radiographic film density measurement of taking pictures, by the blackness value input computing machine measured, obtain X-ray attenuation coefficient-scanning thickness curve, by by this curve with store different x-ray tube voltage copper in a computer, steel, aluminium X-ray attenuation coefficient-scanning thickness curve is compared, the winding coil determining three dimensional wound core oil immersion Three-Phase Distribution Transformers is aluminium, copper, have and save time, laborsaving, do not destroy the advantages such as equipment.Simultaneously due to can quick test Transformer Winding coil material, can claim damages with the transformer of aluminium for copper in time and change breach of contract and design, reduces network distribution transformer loss.
Accompanying drawing explanation
Fig. 1 is transillumination schematic diagram of the present invention;
Fig. 2 is X-ray film supporting structure schematic diagram;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the structural representation of inclination K value measuring appliance;
Fig. 5 is the vertical view of inclination K value measuring appliance;
Fig. 6 is the schematic diagram calculating inclination K value;
Fig. 7 is copper aluminum step wedge or ladder test block x-ray film blackness common logarithm-scanning thickness curve map;
Fig. 8 is the structural representation of egative film positioning rule.
Embodiment
Embodiment, as shown in Figure 1, because the iron core of three dimensional wound core oil immersion Three-Phase Distribution Transformers and coil are triangularly arranged structure, the X ray of below 350kV portable X-ray detection apparatus cannot from penetrating three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil up and down, even if X ray passes from winding coil circle tangential direction, but owing to determining piercing site coil shape and size, the X ray penetration thickness of winding coil can not be calculated, also just cannot carry out texture of coil discriminating.So penetrate angle, coil cylindrical shell lower end with X ray with certain low-angle, and the nearly right angle of coil cylindrical shell end corner connection can be utilized poor to the X ray scanning thickness calculating winding coil, again according to the X-ray attenuation rule discrimination method of copper aluminium in three dimensional wound core oil immersion Three-Phase Distribution Transformers non-disintegration texture of coil Undamaged determination method, closed container, texture of coil discriminating can be carried out, be below concrete discrimination method, the method comprises the following steps:
A, X-ray production apparatus and X-ray film is utilized to take pictures to the non-tested three dimensional wound core oil immersion Three-Phase Distribution Transformers disassembled under state, when taking pictures, ray inspection machine adopts different x-ray tube voltage to irradiate tested 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 transformer arbitrary angle winding;
In step a, X-ray production apparatus places requirement is that vertically downward, X-ray film is placed on below winding coil position, three dimensional wound core oil immersion Three-Phase Distribution Transformers arbitrary angle X-ray production apparatus window, and X-ray film major axis is parallel with X-ray production apparatus window; X-ray production apparatus center line, to the distance of X-ray film, is greater than 700mm, is less than 900mm; X-ray production apparatus window center is to the distance of three dimensional wound core oil immersion Three-Phase Distribution Transformers transillumination position winding outer wall by eccentric throw formulae discovery, and the calculating of eccentric throw L is: 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, and 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.
X-ray film places requirement, X-ray film camera bag posts and detects numbering mark lead word number, X-ray film camera bag X-ray film support clips, then X-ray film support is affixed on substation transformer 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 (or becoming attached to) 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.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, and the 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.
Described X-ray film support is used for X-ray film to be fixed on three dimensional wound core oil immersion Three-Phase Distribution Transformers arbitrary linea angulata circle lower fuel tank base plate outer wall, its concrete structure is as shown in 2 and 3, back up pad 1 is arranged on two magnet sucking discs 2 by screw, and back up pad specification is 20 × 1.5 × 150mm CFRP strip.Magnet sucking disc 2 diameter is 30mm, and thickness is 11mm, and there is M3 screw hole at center, the back side; Plumbous supporting plate 3 is arranged in back up pad 1, plumbous supporting plate 3 is caused by 90 × 2 × 120mm stereotype, carbon cloth, first with carbon cloth, stereotype is wrapped up, then with resin, the carbon cloth of parcel stereotype is solidify to form plumbous supporting plate, with carbon cloth, back up pad 1 and plumbous supporting plate 3 are bundled together, then the solidification of resin carbon fibre cloth.Corrosion inhibitor plate 4 is connected on plumbous supporting plate by two polypropylene fibre ribbons that 25mm is wide, 2mm is thick, corrosion inhibitor plate 4 is caused by 20 × 1 × 120mm stereotype, carbon cloth, stereotype wraps up by carbon cloth, then with resin, the carbon cloth of parcel stereotype is solidify to form corrosion inhibitor plate 4, then be connected on plumbous supporting plate with two polypropylene fibre ribbon resins that 25mm is wide, 2mm is thick.。During paster, X-ray film camera bag is placed in X-ray film support, and X-ray film camera bag aligns with X-ray film support back bracket plate, and X-ray film camera bag pastes lead word number towards upper (towards X-ray production apparatus direction), and corrosion inhibitor plate is pushed down on the right of X-ray film camera bag.
The structure of oblique K value measuring appliance is as Fig. 4, shown in 5 and 6, three dimensional wound core oil immersion Three-Phase Distribution Transformers texture of coil differentiates X ray transillumination inclination K value measuring appliance, it 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 amount magnet sucking disc 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.The width of carbon fiber board 5 is 20mm, thickness 1.5mm, length 150mm.Lead rod 7 cross section is square, and length 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.
Described egative film positioning rule, it comprises transparent scale chi 8, is provided with tergite 9 in the below of transparent scale chi 8, and 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.
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 measured result 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 result utilizes the non-disintegration texture of coil of three dimensional wound core oil immersion Three-Phase Distribution Transformers to differentiate, and X ray transillumination scanning thickness computing method calculate three dimensional wound core oil immersion Three-Phase Distribution Transformers coil image blackness and X ray transillumination scanning thickness, calculate and make three dimensional wound core oil immersion Three-Phase Distribution Transformers coil image blackness common logarithm-scanning thickness curve, 100 times that obtain curve average gradient
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, and inclination K value measuring appliance lower end props up X-ray film; Its inclination K value is, 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.
It is as follows that inclination K value calculates reckoning process:
On x-ray film, C ' is the projection of inclination K value measuring appliance A point, and P point is blackness first measurement point, and N is point is blackness second measurement point or the 3rd measurement point, and T is the thickness (length of side) of inclination K value measuring appliance, then the inclination K value of P point is:
In right-angle triangle OMP, again because at Δ OMC similar in appearance to Δ ABC ', in order to eliminate the thickness of inclination K value measuring appliance to the impact of actual influence error, after calculating inclination K value, the X ray scanning thickness difference that on X-ray film, on coil image, the distance of any two points is corresponding is calculated as: (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.
Three dimensional wound core oil immersion Three-Phase Distribution Transformers 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.
It is that in the three dimensional wound core oil immersion Three-Phase Distribution Transformers coil imagery zone of 1.5 ~ 4.5, the three-point fix of density measurement is on the straight line perpendicular to coil shape tangent line that x-ray film density measurement region must be chosen to be at blackness.
D, tested three dimensional wound core oil immersion Three-Phase Distribution Transformers different x-ray tube voltage attenuation coefficient-scanning thickness curve to be compared with the different x-ray tube voltage attenuation coefficient-scanning thickness curve of copper and aluminium respectively, close-1.0 coils of its value are aluminium, and close-3.7 coils of its value are copper; To differentiate the material of tested three dimensional wound core oil immersion Three-Phase Distribution Transformers winding coil.
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, 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.
Detailed process is
1. laboratory copper, aluminium X-ray attenuation coefficient transillumination technology I:X sensitivity of film are as Fig. 7, focal length F=700mm, and X-ray production apparatus tube voltage is 270kV, exposure is 20mA.min, X-ray film likes a gram D4 type, and before and after intensifying screen, screen is 0.15mmPb, uniform thickness steel plate thickness 10mm.
2. laboratory copper, aluminium X-ray attenuation coefficient transillumination technology II: X ray transillumination as Fig. 7, focal length F=700mm, X-ray production apparatus tube voltage is 270kV, exposure is 20mA.min, X-ray film likes a gram D4 type, and before and after intensifying screen, screen is 0.15mmPb, uniform thickness steel plate thickness 20mm.
3. laboratory copper, aluminium X-ray attenuation coefficient transillumination technology III:X sensitivity of film are as Fig. 7, focal length F=700mm, and X-ray production apparatus tube voltage is 320kV, exposure is 20mA.min, X-ray film likes a gram D4 type, and before and after intensifying screen, screen is 0.15mmPb, uniform thickness steel plate thickness 10mm.
4. laboratory copper, aluminium X-ray attenuation coefficient transillumination technology IV:X sensitivity of film are as Fig. 7, focal length F=700mm, and X-ray production apparatus tube voltage is 320kV, exposure is 20mA.min, X-ray film likes a gram D4 type, and before and after intensifying screen, screen is 0.15mmPb, uniform thickness steel plate thickness 20mm.
5. utilize transillumination technology I transillumination one group of 10 ~ 50mm copper step bar in the lab, X-ray film is numbered 270kVFe10Cu10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 270kVFe10Cu10-50.
6. utilize transillumination industry III transillumination one group of 10 ~ 50mm copper step bar in the lab, X-ray film is numbered 320kVFe10Cu10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 320kVFe10Cu10-50.
7. utilize transillumination technology II transillumination one group of 10 ~ 50mm copper step bar in the lab, X-ray film is numbered 270kVFe20Cu10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 270kVFe20Cu10-50.
8. utilize transillumination technology IV transillumination one group of 10 ~ 50mm copper step bar in the lab, X-ray film is numbered 320kVFe20Cu10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 320kVFe20Cu10-50.
9. utilize transillumination technology I transillumination one group of 10 ~ 50mm aluminum step wedge or ladder test block in the lab, X-ray film is numbered 270kVFe10Al10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 270kVFe10Al10-50.
10. utilize transillumination technology I transillumination one group of 60 ~ 100mm aluminum step wedge or ladder test block in the lab, X-ray film is numbered 270kVFe10Al60-100, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 270kVFe10Al60-100.
11. utilize transillumination industry III transillumination one group of 10 ~ 50mm aluminum step wedge or ladder test block in the lab, and X-ray film is numbered 320kVFe10Al10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 320kVFe10Al10-50.
12. utilize transillumination industry III transillumination one group of 60 ~ 100mm aluminum step wedge or ladder test block in the lab, and X-ray film is numbered 320kVFe10Al60-100, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 320kVFe10Al60-100.
13. utilize transillumination technology II transillumination one group of 10 ~ 50mm aluminum step wedge or ladder test block in the lab, and X-ray film is numbered 270kVFe20Al10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered.
14. utilize transillumination technology II transillumination one group of 60 ~ 100mm aluminum step wedge or ladder test block in the lab, and X-ray film is numbered 270kVFe20Al60-100, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 270kVFe20Al60-100.
15. utilize transillumination technology IV transillumination one group of 10 ~ 50mm aluminum step wedge or ladder test block in the lab, and X-ray film is numbered 320kVFe20Al10-50, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 320kVFe20Al10-50.
16. utilize transillumination technology IV transillumination one group of 60 ~ 100mm aluminum step wedge or ladder test block in the lab, and X-ray film is numbered 320kVFe20Al60-100, and the egative film obtained after scotography 5min, the fixing 15min in darkroom is numbered 320kVFe20Al60-100.
17. utilize black and white densitometer, carried out density measurement by other each ladder to step bar image egative film 270kVFe10Al10-50,270kVFe10Al60-100,320kVFe10Al10-50,320kVFe10Al60-100,270kVFe20Al10-50,270kVFe20Al60-100,320kVFe20Al10-50,320kVFe20Al60-100, and insert aluminium scanning thickness blackness table (table 1).
18. utilize black and white densitometer, carried out density measurement by other each ladder to step bar image egative film sheet 270kVFe10Cu10-50 sheet, 320kVFe10Cu10-50,270kVFe20Cu10-50,320kVFe20Cu10-50, and insert copper scanning thickness blackness table (table 2).
19. by blackness in aluminium scanning thickness blackness table (table 1) lower than 0.3 value remove and get common logarithm, generate aluminium scanning thickness blackness common logarithm table (table 3).
20. by blackness in copper scanning thickness blackness table (table 2) lower than 0.3 value remove and get common logarithm, generate copper scanning thickness blackness common logarithm table (table 4).
21. by the Plotting data of aluminium scanning thickness blackness common logarithm table (table 3) and copper scanning thickness blackness common logarithm table (table 4) in a copper aluminum step wedge or ladder test block x-ray film blackness common logarithm-scanning thickness curve map (Fig. 8), obtain 270kVFe10Al, 270kVFe20Al, 320kVFe10Al, 320kVFe20Al tetra-aluminium X-ray attenuation curves, obtain 270kVFe10Cu, 270kVFe20Cu, 320kVFe10Cu, 320kVFe20Cu tetra-flat copper X-ray attenuation curve.In figure, the blackness common logarithm-scanning thickness curve of four aluminium is close to straight line, and 100 times of slope are about-1.0; In figure, the blackness common logarithm-scanning thickness curve of four flat coppers is close to straight line, and 100 times of slope are about-3.7.
22. differentiate in Non-Destructive Testing work in the three dimensional wound core oil immersion Three-Phase Distribution Transformers texture of coil of reality, X ray transillumination method perspective photographs three dimensional wound core oil immersion Three-Phase Distribution Transformers coil image egative film first to utilize the non-disintegration texture of coil of three dimensional wound core oil immersion Three-Phase Distribution Transformers to differentiate, X ray transillumination scanning thickness computing method are differentiated again according to the non-disintegration texture of coil of three dimensional wound core oil immersion Three-Phase Distribution Transformers, the measurements and calculations of three dimensional wound core oil immersion Three-Phase Distribution Transformers non-solution body coil X ray transillumination X-ray film density measurement method go out three dimensional wound core oil immersion Three-Phase Distribution Transformers coil image blackness and X ray transillumination scanning thickness, calculate and make three dimensional wound core oil immersion Three-Phase Distribution Transformers coil image blackness common logarithm-scanning thickness curve, 100 times that obtain curve average gradient, close-1.0 coils of its value are aluminium, close-3.7 coils of its value are copper.
Table 1. aluminium scanning thickness blackness table
Table 2. copper scanning thickness blackness table
Table 3. aluminium scanning thickness blackness common logarithm table
Table 4. copper scanning 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.
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Address after: 550002 Jiefang Road, Nanming, Guizhou, No. 32, Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF GUIZHOU POWER GRID CO., LTD. Address before: 550002 Jiefang Road, Nanming, Guizhou, No. 32, Patentee before: Guizhou Power Test Institute |