Manufacturing method of transformer graphite glue electrostatic ring

Abstract

The present invention provides a method for manufacturing a transformer graphite glue electrostatic ring. The method comprises the following steps: A) manufacturing a ring core; B) coating graphite glue at a preset position of the ring core to form a graphite glue layer on the ring core; C) measuring the resistance value between the end diagonals and judging whether the resistance value is within a preset resistance value range; D) installing a potential line; and E) forming a coating layer; wherein if the resistance value measured in step C is not within the preset resistance value range, step B is repeated, wherein if the resistance value measured in step C is within the preset resistance value range, step D is performed.

Description

Technical Field

[0001] The invention relates to a transformer electrostatic ring and a manufacturing method thereof, and more particularly to a manufacturing method of a transformer graphite glue electrostatic ring. Background Art

[0002] Transformer electrostatic ring refers to a special structural component installed at the end of a high voltage or ultra-high voltage transformer winding to increase the longitudinal compensation capacitance of the winding to the ground, weaken the impact of lightning strikes on short-term overload of the transformer, and mitigate the electric field strength at the end of the winding.

[0003] The traditional production of transformer electrostatic ring is to glue aluminum foil and casein glue to the specified position, but the aluminum foil is prone to wrinkles, bulging and other undesirable phenomena during gluing, thus affecting the performance of the transformer electrostatic ring. In addition, the traditional method of adding aluminum foil and casein glue cannot control the resistance value of the transformer electrostatic ring, thus causing the performance of the transformer electrostatic ring to be unstable. Summary of the invention

[0004] One object of the present invention is to provide a method for manufacturing a transformer graphite glue electrostatic ring, wherein the transformer graphite glue electrostatic ring is an electrostatic ring with graphite glue as a conductive layer and is used in a transformer.

[0005] Another object of the present invention is to provide a method for manufacturing a transformer graphite glue electrostatic ring, wherein the traditional process of adding casein glue to aluminum foil is replaced by coating with graphite glue, thereby avoiding the generation of wrinkles, bulging and other undesirable phenomena.

[0006] Another object of the present invention is to provide a method for manufacturing a transformer graphite glue electrostatic ring, wherein the traditional process of bonding aluminum foil and casein is replaced by coating with graphite glue, so that the resistance value of the electrostatic ring is controllable.

[0007] Another object of the present invention is to provide a method for manufacturing a transformer graphite glue electrostatic ring, wherein the traditional process of bonding aluminum foil and casein is replaced by coating with graphite glue, so that the resistance value of the electrostatic ring is controllable, thereby ensuring the stability of the electrostatic ring performance.

[0008] According to one aspect of the present invention, the present invention provides a method for manufacturing a transformer graphite glue electrostatic ring, comprising the following steps:

[0009] A) making a ring core;

[0010] B) coating graphite glue at a preset position of the ring core to form a graphite glue layer on the ring core;

[0011] C) measuring the resistance value between the end diagonals, and determining whether the resistance value is within a preset resistance value range;

[0012] D) installing a potential line; and

[0013] E) forming a coating layer;

[0014] If the resistance value measured in step C is not within the preset resistance value range, step B is repeated, and if the resistance value measured in step C is within the preset resistance value range, step D is performed.

[0015] According to an embodiment of the present invention, the preset resistance value ranges from 50 to 250Ω.

[0016] According to an embodiment of the present invention, the graphite glue is prepared by mixing a black main agent and a curing agent in a ratio of 100:3.

[0017] According to one embodiment of the present invention, step B comprises the following steps:

[0018] B1) Mark the glue application position;

[0019] B2) Setting boundary maintenance markers;

[0020] B3) Apply graphite glue;

[0021] B4) removing the boundary retaining marker and cleaning the graphite glue overflowing from the boundary; and

[0022] B5) Drying and curing the graphite glue.

[0023] According to one embodiment of the present invention, step A comprises the following steps:

[0024] A1) bonding a plurality of stacked paperboards to form a ring core semi-finished product; and

[0025] A2) machining the semi-finished ring core to obtain the ring core, wherein the semi-finished ring core is machined through finishing steps such as sawing bevels, openings, chamfers, and fine drilling to obtain the ring core with a preset shape, chamfers, hole positions, and openings.

[0026] According to one embodiment of the present invention, step E comprises the following steps:

[0027] E1) wrapping a metal corrugated paper around a surface of a ring core body of the ring core;

[0028] E2) coating a second crepe paper on the outer side of a graphite rubber layer without a lead-out end of the ring core and a graphite rubber layer with a lead-out end of the ring core; and

[0029] E3) Wrapping a third crepe paper around the outer sides of the metal crepe paper and the second crepe paper.

[0030] According to one embodiment of the present invention, step E further includes the following steps:

[0031] Ey) a corrugated paper tube is sheathed on the outside of a lead-out wire;

[0032] Ez) bonding and fixing the crepe paper tube to a cross-shaped opening of the second crepe paper.

[0033] According to one embodiment of the present invention, step A1 includes the following steps:

[0034] A11) cutting the paper to provide the paperboard of a preset quantity and a preset size;

[0035] A12) drying, wherein the drying temperature is 105°C ± 5°C, and the drying time is more than 12 hours;

[0036] A13) Glue is applied to the paperboard, wherein double-sided gluing is adopted, and the amount of glue used is 330-350g / cm 2 (liquid single-sided), considering the adhesion between the container and the fiber brush surface, the recommended usage is 370-380g / cm 2 (liquid single-sided), double-sided glue coating amount should be 170g x2 / cm 2 (liquid);

[0037] A14) cold pressing the glue coated paperboard by a press; and

[0038] A15) Static storage: Leave the machine to stand for more than 12 hours.

[0039] According to another aspect of the present invention, the present invention further provides a transformer graphite glue electrostatic ring, wherein the manufacturing method of the graphite glue electrostatic ring comprises the following steps:

[0040] A) making a ring core;

[0041] B) coating graphite glue at a preset position of the ring core to form a graphite glue layer on the ring core;

[0042] C) measuring the resistance value between the end diagonals, and determining whether the resistance value is within a preset resistance value range;

[0043] D) installing a potential line; and

[0044] E) forming a coating layer;

[0045] If the resistance value measured in step C is not within the preset resistance value range, step B is repeated, and if the resistance value measured in step C is within the preset resistance value range, step D is performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flow chart of a method for manufacturing a transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0047] Figure 2 It is a schematic diagram of the manufacturing process of the transformer graphite glue electrostatic ring according to the above-mentioned first preferred embodiment of the present invention.

[0048] Figure 3 The steps of making the ring core in the method for making the transformer graphite glue electrostatic ring according to the above first preferred embodiment of the present invention are explained.

[0049] Figure 4 It is a schematic diagram of the manufacturing process of a ring core of the transformer graphite glue electrostatic ring according to the above-mentioned first preferred embodiment of the present invention.

[0050] Figure 5 The step of coating graphite glue in the method for manufacturing the transformer graphite glue electrostatic ring according to the above first preferred embodiment of the present invention is explained.

[0051] Figure 6 It is a schematic diagram of a graphite glue coating process of the transformer graphite glue electrostatic ring according to the above-mentioned first preferred embodiment of the present invention.

[0052] Figure 7 The step of forming a coating layer in the method for manufacturing the transformer graphite glue electrostatic ring according to the above first preferred embodiment of the present invention is explained.

[0053] Figure 8 It is a schematic diagram of a process of forming a coating layer of the transformer graphite glue electrostatic ring according to the above-mentioned first preferred embodiment of the present invention.

[0054] Fig. 9 It is a cross-sectional view of the transformer graphite glue electrostatic ring according to the above-mentioned first preferred embodiment of the present invention.

[0055] Fig.10 It is a flow chart of a method for manufacturing a transformer graphite glue electrostatic ring according to a second preferred embodiment of the present invention.

[0056] Fig.11 It is a schematic diagram of the manufacturing process of the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention.

[0057] Fig.12 The steps of making the ring core in the method for making the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention are explained.

[0058] Fig.13 It is a schematic diagram of the manufacturing process of a ring core of the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention.

[0059] Fig.14The step of coating graphite glue in the method for manufacturing the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention is explained.

[0060] Fig.15 It is a schematic diagram of a graphite glue coating process of the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention.

[0061] Fig.16 The step of forming a coating layer in the method for manufacturing the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention is explained.

[0062] Fig.17 It is a schematic diagram of a process of forming a coating layer of the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention.

[0063] Fig.18 It is a cross-sectional view of the transformer graphite glue electrostatic ring according to the above second preferred embodiment of the present invention. DETAILED DESCRIPTION

[0064] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0065] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0066] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0067] Specification of the drawings Figure 1 A method for manufacturing a transformer graphite glue electrostatic ring according to a first preferred embodiment of the present invention is explained, wherein the transformer graphite glue electrostatic ring is a graphite glue electrostatic ring for a transformer. Figure 1The transformer graphite glue electrostatic ring manufacturing method comprises the following steps:

[0068] A) making a ring core 10; and

[0069] B) coating graphite glue on a preset position of the ring core 10 to form a graphite glue layer 20 on the ring core 10 .

[0070] According to the first preferred embodiment of the present invention, the ring core 10 is a full circle of seamless laminated paperboard. Specifically, the ring core 10 is a full circle of seamless laminated paperboard bonded with casein. The ring core 10 is made of a plurality of paperboards 101 as raw materials. The plurality of paperboards 101 are stacked and bonded by casein 102, wherein the casein 102 is infiltrated into the paperboard 101, so that the paperboard 101 is firmly bonded to the adjacent paperboards 101.

[0071] Reference to the attached drawings of the specification Figure 4 , a plurality of paperboards 101 are stacked and bonded by the casein 102, thereby forming a ring core semi-finished product 109 with a preset thickness. The ring core semi-finished product 109 has a preset thickness and a preset extension length. The ring core semi-finished product 109 also needs to be further processed into a preset shape.

[0072] Specifically, step A includes the following steps:

[0073] A1) bonding a plurality of stacked paperboards to form a ring core semi-finished product 109; and

[0074] A2) machining the semi-finished ring core 109 to obtain the ring core 10, wherein the semi-finished ring core 109 is machined through finishing steps such as sawing bevels, openings, chamfers, and fine drilling to obtain the ring core 10 with a preset shape, chamfers, hole positions, and openings.

[0075] According to the first preferred embodiment of the present invention, step A1 comprises the following steps:

[0076] A11) Cutting the paper to provide a preset quantity and size of paperboard;

[0077] According to the first preferred embodiment of the present invention, step A1 further comprises the following steps:

[0078] A12) drying, wherein the drying temperature is 105°C ± 5°C, and the drying time is more than 12 hours;

[0079] A13) Glue is applied to the paperboard, wherein double-sided gluing is adopted, and the amount of glue used is 330-350g / cm 2 (liquid single-sided), considering the adhesion between the container and the fiber brush surface, the recommended usage is 370-380g / cm 2(liquid single-sided), double-sided glue coating amount should be 170g x2 / cm 2 (liquid);

[0080] A14) cold pressing the glue coated paperboard by a press; and

[0081] A15) Static storage: Place the machine for more than 12 hours. Figure 3 , the step A2 comprises the following steps:

[0082] A21) drilling to form a potential line hole 100 in the ring core semi-finished product 109.

[0083] According to the first preferred embodiment of the present invention, the transformer graphite glue electrostatic ring is an unequal electrostatic ring. Step A2 also includes the following steps:

[0084] A22) is milled so that the overall size profile of the ring core 10 meets the requirements of the preset non-uniform electrostatic ring.

[0085] According to the first preferred embodiment of the present invention, step A further comprises the following steps:

[0086] A3) Re-drying: Place the processed product in a drying oven, slowly heat and dry for more than 6 hours.

[0087] According to this first preferred embodiment of the present invention, step B comprises the following steps:

[0088] B1) Marking the glue coating position: setting two marking lines 107 and 108 at the preset positions of the ring core 10 respectively;

[0089] B2) Setting boundary keeping marker X;

[0090] B3) Apply graphite glue;

[0091] B4) removing the boundary retaining marker and cleaning the graphite glue overflowing from the boundary; and

[0092] B5) Drying and curing the graphite glue.

[0093] According to the first preferred embodiment of the present invention, step B2 sets a removable boundary retaining marker X at a preset position. So as to carry out the operation of applying graphite glue in step B3. Step B2 sets a removable marker at 110 mm inside and 12 mm outside. The boundary retaining marker X will not absorb the graphite glue applied thereon. In other words, the boundary retaining marker X is made of anti-graphite glue material, so that even if graphite glue is accidentally applied to the boundary retaining marker X, it will not affect the position of the graphite glue on the ring core 10. According to the first preferred embodiment of the present invention, the boundary retaining marker X is a paper tape.

[0094] It is worth mentioning that, compared with the traditional process of gluing aluminum foil and casein glue to a designated position, the first preferred embodiment of the present invention uses a graphite glue coating process instead, which can not only avoid wrinkles, bulging and other undesirable phenomena, but also make the resistance value of the transformer electrostatic ring controllable, so that the resistance value of the transformer electrostatic ring is maintained within a preset range. According to the first preferred embodiment of the present invention, the resistance value of the transformer electrostatic ring is 50 to 250Ω.

[0095] According to the first preferred embodiment of the present invention, the graphite glue is prepared by mixing a black main agent and a curing agent in a ratio of 100:3.

[0096] According to the first preferred embodiment of the present invention, the transformer graphite glue electrostatic ring manufacturing method includes a step of measuring resistance value to ensure that the resistance value of the transformer electrostatic ring is within a preset range. If the resistance value does not meet the requirements, a second graphite glue coating is required, and then drying is performed. After being completely dried, the resistance is measured again. In other words, if the resistance value does not meet the requirements, step B is repeated. If the resistance value meets the requirements, the subsequent steps are performed.

[0097] Specifically, the transformer graphite glue electrostatic ring manufacturing method further includes the following steps:

[0098] C) Measure the resistance between the end corners.

[0099] If the resistance value measured in step C is not within the preset range, repeat step B.

[0100] If the resistance value measured in step C is within the preset range, perform the following steps:

[0101] D) installing a potential line; and

[0102] E) forming a coating layer.

[0103] Reference to the attached drawings of the specification Figure 2 The transformer electrostatic ring includes a ring core 10, a graphite glue layer 20, a potential line 30 and a covering layer 40.

[0104] The ring core 10 has a potential wire hole 100 for accommodating and fixing the potential wire 30. According to the first preferred embodiment of the present invention, the potential wire hole 100 has a hole diameter Φ of 6 and a hypotenuse L of 75.

[0105] Reference to the attached drawings of the specification Figure 2 The potential line 30 includes a lead line 31 and a connecting line 32 .

[0106] Reference to the attached drawings of the specification Fig. 9, the lead wire 31 and the connecting wire 32 are connected as a whole. Specifically, the lead wire 31 is doubled and welded with the connecting wire 32 to form a welding connection 60. According to the first preferred embodiment of the present invention, the welding connection 60 is arranged in the point line hole 100 of the ring core 10. The metal corrugated paper 41 covers and fixes the connecting wire 32 of the potential wire 30 to the ring core body 11.

[0107] The graphite adhesive layer 20 includes a graphite adhesive layer 21 without an outlet terminal and a graphite adhesive layer 22 with an outlet terminal, wherein the graphite adhesive layer 22 with an outlet terminal has an outlet hole 220 connected to the potential line hole 100 so that the potential line 30 can be led out.

[0108] Specifically, the ring core 10 extends in a ring shape and has an opening 1000. More specifically, the ring core 10 extending in a ring shape includes a ring core body 11, a non-outlet end 12 extending integrally from the ring core body 11, and a wire-outlet end 13 extending integrally from the ring core body 11, wherein the non-outlet end 12 and the wire-outlet end 13 are located at opposite ends of the ring core body 11. The opening 1000 is formed between the non-outlet end 12 and the wire-outlet end 13. The non-outlet end graphite glue layer 21 is formed on the non-outlet end 12, and the wire-outlet end graphite glue layer 22 is formed on the wire-outlet end 13. Specifically, the non-outlet end graphite glue layer 21 is coated on the surface of the non-outlet end 12, and the wire-outlet end graphite glue layer 22 is coated on the surface of the wire-outlet end 13.

[0109] More specifically, the non-outlet terminal 12 forms a first graphite glue coating surface 121. The outlet terminal 13 forms a second graphite glue coating surface 131. The non-outlet terminal graphite glue layer 21 of the graphite glue layer 20 is coated on the first graphite glue coating surface 121. The outlet terminal graphite glue layer 22 of the graphite glue layer 20 is coated on the second graphite glue coating surface 131.

[0110] The end of the connecting wire 32 has a preset overlap length with the graphite glue layer 21 of the non-outlet end 12, and the end is tinned to prevent rust and bifurcation. According to the first preferred embodiment of the present invention, the preset overlap length is 50mm. According to the first preferred embodiment of the present invention, the connecting wire 32 is fixed by mixing graphite glue and 502 and dispensing.

[0111] According to the first preferred embodiment of the present invention, the coating layer 40 includes a metal corrugated paper 41, a second corrugated paper 42 and a third corrugated paper 43, wherein the metal corrugated paper 41 is coated on the surface of the ring core body 11 by winding and coating. The second corrugated paper 42 is coated on the surface corresponding to the position of the non-outlet terminal 12 and the position of the outlet terminal 13 by winding and coating. In other words, the second corrugated paper 42 is coated on the outside of the graphite adhesive layer 21 without outlet terminals and the graphite adhesive layer 22 with outlet terminals by winding and coating. Further, the third corrugated paper 43 is coated on the outside of the metal corrugated paper 41 and the second corrugated paper 42 by winding and coating.

[0112] Specifically, step E includes the following steps:

[0113] E1) wrapping the metal corrugated paper 41 around the surface of the ring core body 11;

[0114] E2) wrapping the second crepe paper 42 on the outer sides of the graphite adhesive layer 21 without the wire outlet and the graphite adhesive layer 22 with the wire outlet; and

[0115] E3) Wrapping the third crepe paper 43 around the outer sides of the metal crepe paper 41 and the second crepe paper 42 .

[0116] According to the first preferred embodiment of the present invention, the aluminum foil surface of the metal corrugated paper 41 overlaps 60mm at the graphite glue electrode parts at both ends, covers the outer perforation of the potential line, and cuts R10 fillet at the end of the metal corrugated paper 41. The metal corrugated paper 41 is wrapped in a 1 / 2 overlapped lap manner, and the resistance value between the lead wire 31 of the potential line 30 and the graphite glue layer 20 is measured after wrapping. Tests show that the resistance value between the lead wire 31 of the potential line 30 and the graphite glue layer 20 is between 50 and 250Ω.

[0117] According to the first preferred embodiment of the present invention, before step E2, step E further includes the following steps:

[0118] Ex: Measure the resistance value between the lead wire 31 of the potential wire 30 and the graphite adhesive layer 20 to confirm whether it is within the preset resistance value range.

[0119] Reference to the attached drawings of the specification Figure 2 The transformer graphite glue electrostatic ring further includes a corrugated paper tube 70, wherein the corrugated paper tube 70 is sleeved on the outside of the lead wire 31. The corrugated paper tube 70 is fixed together with the second corrugated paper 42.

[0120] Specifically, step E2 includes the following steps:

[0121] E21: cutting a cross-shaped opening on the second crepe paper 42;

[0122] E22: passing through the cross-shaped opening and fixing the cross-shaped opening to the end where the lead wire 31 intersects with the ring core 10; and

[0123] E23: Wrapping the second corrugated paper 42 around the outer sides of the graphite adhesive layer 21 without the wire outlet and the graphite adhesive layer 22 with the wire outlet.

[0124] According to this first preferred embodiment of the present invention, step E comprises the following steps:

[0125] Ey) a corrugated paper tube 70 is sleeved on the outer side of the lead wire 31;

[0126] Ez) adhesively fix the crepe paper tube 70 to the cross-shaped opening of the second crepe paper 42.

[0127] According to the first preferred embodiment of the present invention, the outer diameter side end surface of the crepe paper tube 70 is coated with casein and then attached to both ends of the cross-shaped opening of the second crepe paper 42 .

[0128] Step E3: stretch the third crepe paper 43 and stick it to the upper and lower parts of the ring core 10, wherein the third crepe paper 43 cannot overlap with the crepe paper on the side, but can only butt. The starting and ending positions are about 2mm away from the previous layer, wherein the third crepe paper 43 is used for 1 / 2 overlap wrapping, and is wound once, starting from the end, with a length slightly exceeding 110, which is one round, and this round is repeated until the wrapping reaches a preset thickness.

[0129] Specification of the drawings Fig.10 A method for manufacturing a transformer graphite glue electrostatic ring according to a second preferred embodiment of the present invention is explained. Fig.10 The transformer graphite glue electrostatic ring manufacturing method comprises the following steps:

[0130] A') making a ring core 10A; and

[0131] B′) coating graphite glue on a preset position of the ring core 10A to form a graphite glue layer 20A on the ring core 10A.

[0132] According to the second preferred embodiment of the present invention, the ring core 10A is a full circle of seamless laminated paperboard. Specifically, the ring core 10A is a full circle of seamless laminated paperboard bonded with casein. The ring core 10A is made of a plurality of paperboards 101A as raw materials. The plurality of paperboards 101A are stacked and bonded by casein 102A, wherein the casein 102A is infiltrated into the paperboard 101A, so that the paperboard 101A is firmly bonded to the adjacent paperboards 101A.

[0133] Reference to the attached drawings of the specification Fig.13, a plurality of paperboards 101A are stacked and bonded by the casein 102A, thereby forming a ring core semi-finished product 109A with a preset thickness. The ring core semi-finished product 109A has a preset thickness and a preset extension length. The ring core semi-finished product 109A also needs to be further processed into a preset shape.

[0134] Specifically, step A' comprises the following steps:

[0135] A1') making a semi-finished ring core product 109A: bonding a plurality of stacked paperboards 101A to form the semi-finished ring core product 109A; and

[0136] A2) machining the semi-finished ring core 109A to obtain the ring core 10A, wherein the semi-finished ring core 109A is machined through finishing steps such as sawing bevels, openings, chamfers, and fine drilling to obtain the ring core 10A with a preset shape, chamfers, hole positions, and openings.

[0137] According to the second preferred embodiment of the present invention, step A1' comprises the following steps:

[0138] A11') cutting the paper to provide a preset quantity and a preset size of paperboard 101A;

[0139] A12) drying, wherein the drying temperature is 105°C ± 5°C, and the drying time is more than 12 hours;

[0140] A13) applying glue to the paperboard, wherein double-sided gluing is adopted, and the amount of glue used is 330-350 g / cm2 (liquid single-sided), wherein considering the adhesion between the container and the fiber brush surface, the recommended amount is 370-380 g / cm2 (liquid single-sided), and the double-sided glue amount should be 170 g x2 / cm2 (liquid);

[0141] A14) cold pressing the glue coated paperboard by a press; and

[0142] A15) Static storage: Leave the machine to stand for more than 12 hours.

[0143] According to the second preferred embodiment of the present invention, the transformer graphite glue electrostatic ring is an equal electrostatic ring.

[0144] Reference to the attached drawings of the specification Fig.12 , the step A2' comprises the following steps:

[0145] A21') punching to form a potential line hole 100A in the semi-finished ring core 109A; and

[0146] A23') is chamfered so that the edge of the ring core 10A has a preset chamfer.

[0147] According to the second preferred embodiment of the present invention, step A' further comprises the following steps:

[0148] A3') Re-drying: Place the processed product in a drying oven, slowly heat and dry for more than 6 hours.

[0149] According to this second preferred embodiment of the present invention, step B' comprises the following steps:

[0150] B1') marking the glue application positions 107A and 108A;

[0151] B2') Setting boundary maintenance markers;

[0152] B3') Apply graphite glue;

[0153] B4') removing the boundary retaining marker and cleaning the graphite glue overflowing from the boundary; and

[0154] B5') Drying and curing the graphite glue.

[0155] According to the second preferred embodiment of the present invention, step B2' sets a removable boundary retaining marker X' at a preset position. So as to carry out the operation of applying graphite glue in step B3'. Step B2' sets a removable marker at a preset position. The boundary retaining marker X' will not absorb the graphite glue applied thereon. In other words, the boundary retaining marker X' is made of anti-graphite glue material, so that even if graphite glue is accidentally applied to the boundary retaining marker X', it will not affect the position of the graphite glue on the ring core 10A. According to the second preferred embodiment of the present invention, the boundary retaining marker X' is a paper tape.

[0156] It is worth mentioning that, compared with the traditional process of gluing aluminum foil to a designated position with cheese glue, the second preferred embodiment of the present invention uses a graphite glue coating process instead, which can not only avoid wrinkles, bulging and other undesirable phenomena, but also make the resistance value of the transformer electrostatic ring controllable, so that the resistance value of the transformer electrostatic ring is maintained within a preset range. According to the second preferred embodiment of the present invention, the resistance value of the transformer electrostatic ring is 50 to 250Ω.

[0157] According to the second preferred embodiment of the present invention, the method for making the transformer graphite glue electrostatic ring includes a step of measuring the resistance value to ensure that the resistance value of the transformer electrostatic ring is within a preset range. If the resistance value does not meet the requirements, a second graphite glue coating is required, and then drying is performed. After being completely dried, the resistance is measured again to determine whether it meets the preset resistance value range. If the resistance value is not within the preset range, repeat step B'. If the resistance value is not within the preset range, proceed to the subsequent steps.

[0158] Specifically, the transformer graphite glue electrostatic ring manufacturing method further includes the following steps:

[0159] C') Measure the resistance between the end corners.

[0160] If the resistance value measured in step C' is not within the preset range, step B' is repeated.

[0161] If the resistance value measured in step C' is within the preset range, the following steps are performed:

[0162] D') installing a potential line; and

[0163] E') forms a coating layer.

[0164] Reference to the attached drawings of the specification Fig.11 The transformer electrostatic ring includes a ring core 10A, a graphite glue layer 20A, a potential line 30A and a covering layer 40A.

[0165] The ring core 10A has a potential wire hole 100A for accommodating and fixing the potential wire 30A. According to the second preferred embodiment of the present invention, the potential wire hole 100A has a hole diameter Φ of 6 and a hypotenuse L of 75.

[0166] Reference to the attached drawings of the specification Fig.11 , the potential line 30A includes a lead line 31A and a connecting line 32A. The lead line 31A and the connecting line 32A are connected as a whole. Specifically, the lead line 31A is doubled and welded with the connecting line 32A to form a welding connection 60A. According to the second preferred embodiment of the present invention, the welding connection 60A is arranged in the point line hole 100A of the ring core 10A.

[0167] According to this second preferred embodiment of the present invention, step D' comprises the following steps:

[0168] D1') double fold lead wire 31A;

[0169] D2′) welding the lead wire 31A to the connecting wire 32A, thereby forming a welding connection 60A connecting the lead wire 31A and the connecting wire 32A;

[0170] D3') passes through the potential wire hole 100A so that the connecting wire 32A is passed through the potential wire hole 100A to a position close to the other end of the ring core 10A, and the lead wire 31A extends from the potential wire hole 100A to the periphery of the ring core until the other end of the ring core 10A, wherein the welding connection 60A is maintained in the potential wire hole 100A.

[0171] Reference to the attached drawings of the specification Fig.18, the potential wire hole 100A is provided at one end of the ring core 10A, and has a potential wire hole first end 1001A close to the other end of the ring core 10A and a potential wire hole second end 1002A away from the other end of the ring core 10A. After the lead wire 31A and the connecting wire 32A connected together pass through the potential wire hole 100A, the welding connection 60A is maintained in the potential wire hole 100A, wherein the connecting wire 32A is passed through the potential wire hole first end 1001A of the potential wire hole 100A, wherein the lead wire 31A is passed through the potential wire hole second end 1002A of the potential wire hole 100A and continues to extend to the outside of the ring core 10A until the other end of the ring core 10A.

[0172] The graphite adhesive layer 20A includes a graphite adhesive layer 21A without an outlet terminal and a graphite adhesive layer 22A with an outlet terminal, wherein the graphite adhesive layer 22A with an outlet terminal has an outlet hole 220A connected to the potential line hole 100A so that the connection line 32A can be led out.

[0173] Specifically, the ring core 10A extends in a ring shape and has an opening 1000A. More specifically, the ring core 10A extending in a ring shape includes a ring core body 11A, a non-outlet end 12A extending integrally from the ring core body 11A, and a wire-outlet end 13A extending integrally from the ring core body 11A, wherein the non-outlet end 12A and the wire-outlet end 13A are located at opposite ends of the ring core body 11A. The opening 1000A is formed between the non-outlet end 12A and the wire-outlet end 13A. The non-outlet end graphite glue layer 21A is formed on the non-outlet end 12A, and the wire-outlet end graphite glue layer 22A is formed on the wire-outlet end 13A. Specifically, the graphite adhesive layer 21A without a wire outlet is coated on the surface of the wire outlet 12A without a wire outlet, and the graphite adhesive layer 22A with a wire outlet is coated on the surface of the wire outlet 13A.

[0174] More specifically, the non-outlet terminal 12A forms a first graphite glue coating surface 121A. The outlet terminal 13A forms a second graphite glue coating surface 131A. The non-outlet terminal graphite glue layer 21A of the graphite glue layer 20A is coated on the first graphite glue coating surface 121A. The outlet terminal graphite glue layer 22A of the graphite glue layer 20A is coated on the second graphite glue layer coating surface 131A. The outlet terminal 13A forms a crepe paper coating surface 131A. The coating layer 40A is coated on the crepe paper coating surface 131A.

[0175] The end of the potential line 30A has a preset overlap length with the graphite glue layer 21A of the non-outlet end coated on the non-outlet end 12A, and the end is tinned to prevent rust and bifurcation. According to the second preferred embodiment of the present invention, the preset overlap length is 50mm. According to the second preferred embodiment of the present invention, the potential line 30A is fixed by dispensing a mixture of graphite glue and 502.

[0176] Reference to the attached drawings of the specification Fig.18 The potential wire hole 100A is provided at the end 13A with an outlet of the ring core 10A, and has a first end 1001A of the potential wire hole close to the end 12A without an outlet of the ring core 10A and a second end 1002A of the potential wire hole far away from the end 12A without an outlet of the ring core 10A. After the lead wire 31A and the connecting wire 32A connected together pass through the potential wire hole 100A, the welding connection 60A is maintained in the potential wire hole 100A, wherein the connecting wire 32A is passed out to the outside of the first end 1001A of the potential wire hole 100A, wherein the lead wire 31A is passed out to the second end 1002A of the potential wire hole 100A and continues to extend to the outside of the ring core 10A until the end 12A without an outlet of the ring core 10A. The metal corrugated paper 41A covers the connecting wire 32A of the potential wire 30A and fixes it to the ring core body 11A.

[0177] According to the second preferred embodiment of the present invention, the coating layer 40A includes a metal corrugated paper 41A, a second corrugated paper 42A and a third corrugated paper 43A, wherein the metal corrugated paper 41A is coated on the surface of the ring core body 11A by winding and coating. The second corrugated paper 42A is coated on the surface corresponding to the position of the non-outlet terminal 12A and the outlet terminal 13A by winding and coating. In other words, the second corrugated paper 42A is coated on the outside of the graphite glue layer 21A without outlet terminal and the graphite glue layer 22A with outlet terminal by winding and coating. Further, the third corrugated paper 43A is coated on the outside of the metal corrugated paper 41A and the second corrugated paper 42A by winding and coating. The metal corrugated paper 41A partially covers and fixes the potential line 30A to the ring core body 11A.

[0178] Specifically, step E' comprises the following steps:

[0179] E1′) wrapping the metal corrugated paper 41A around the surface of the ring core body 11A;

[0180] E2′) wrapping the second crepe paper 42A on the outer sides of the graphite adhesive layer 21A without the lead-out terminal and the graphite adhesive layer 22A with the lead-out terminal; and

[0181] E3′) wrapping the third crepe paper 43A around the outer sides of the metal crepe paper 41A and the second crepe paper 42A.

[0182] According to the second preferred embodiment of the present invention, the aluminum foil surface of the metal corrugated paper 41A overlaps 60mm at the graphite glue electrode parts at both ends, covers the outer perforation of the potential line, and cuts R10 fillet at the end of the metal corrugated paper 41A. The metal corrugated paper 41A is wrapped in a 1 / 2 overlapped lap method, and the resistance value between the outlet of the potential line 30A and the graphite glue layer 20A is measured after wrapping. Tests show that the resistance value between the outlet of the potential line 30A and the graphite glue layer 20A is between 50 and 250Ω.

[0183] According to the second preferred embodiment of the present invention, before step E2, step E further includes the following steps:

[0184] Ex': Measure the resistance between the outlet of the potential line 30A and the graphite adhesive layer 20A to confirm whether it is within the preset resistance value range.

[0185] Reference to the attached drawings of the specification Fig.11 The transformer graphite glue electrostatic ring further includes a corrugated paper tube 70A, wherein the corrugated paper tube 70A is sleeved on the outside of the lead wire 31A. The corrugated paper tube 70A is fixed together with the second corrugated paper 42A.

[0186] Specifically, step E2 includes the following steps:

[0187] E21': cutting a cross-shaped opening on the second crepe paper 42A;

[0188] E22': passing through the cross-shaped opening and fixing the cross-shaped opening to the end where the lead wire 31A intersects with the ring core 10A; and

[0189] E23': Wrap the second corrugated paper 42A around the outer sides of the graphite adhesive layer 21A without a lead-out terminal and the graphite adhesive layer 22A with a lead-out terminal.

[0190] According to this second preferred embodiment of the present invention, step E' comprises the following steps:

[0191] Ey') a corrugated paper tube 70A is sleeved on the outside of the lead wire 31A;

[0192] The crepe paper tube 70A is glued and fixed to the cross-shaped opening of the second crepe paper 42A.

[0193] According to the second preferred embodiment of the present invention, the outer diameter side end surface of the crepe paper tube 70A is coated with casein and then attached to both ends of the cross-shaped opening of the second crepe paper 42A.

[0194] Step E3': stretch the third crepe paper 43A and stick it to the upper and lower parts of the ring core 10A, wherein the third crepe paper 43A cannot overlap with the crepe paper on the side, but can only butt. The starting and ending positions are about 2mm away from the previous layer, wherein the third crepe paper 43A is used for 1 / 2 overlap wrapping, and is wound once, starting from the end, with a length slightly exceeding 110, which is one round, and this round is repeated until the wrapping reaches a preset thickness.

[0195] It should be noted that in the apparatus and method of the present application, the components or steps in different embodiments can be decomposed and / or recombined without departing from the principles of the present invention. Such decomposition and / or recombination should be considered to be included in the inventive concept of the present application.

[0196] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A method for making a transformer graphite glue electrostatic ring, characterized in that: The following steps are involved: A) Make a ring core; B) coating graphite glue at a preset position of the ring core to form a graphite glue layer on the ring core; C) measuring the resistance value between the end diagonals, and determining whether the resistance value is within a preset resistance value range; D) Install a potential line; and E) forming a coating layer; If the resistance value measured in step C is not within the preset resistance value range, repeat step B, and if the resistance value measured in step C is within the preset resistance value range, proceed to step D; The ring core comprises a ring core body, a non-outlet end extending integrally from the ring core body, and an outlet end extending integrally from the ring core body, wherein the graphite glue is coated on the non-outlet end and the outlet end, wherein the graphite glue is prepared by mixing a black main agent and a curing agent in a ratio of 100:3; The ring core is formed by stacking a plurality of cardboards and pasting them together with casein; Wherein step E comprises the following steps: E1) wrapping a metal corrugated paper around a surface of a ring core body of the ring core; E2) coating a second corrugated paper on the outer side of a graphite rubber layer without a lead-out end of the ring core and a graphite rubber layer with a lead-out end of the ring core; and E3) Wrapping a third crepe paper around the outer sides of the metal crepe paper and the second crepe paper.

2. The method for manufacturing a transformer graphite glue electrostatic ring according to claim 1, wherein the preset resistance value ranges from 50 to 250Ω.

3. The method for making a transformer graphite glue electrostatic ring according to claim 2, wherein step B comprises the following steps: B1) Mark the glue application position; B2) Setting up boundary maintenance markers; B3) Apply graphite glue; B4) removing the boundary retaining marker and cleaning the graphite glue overflowed from the boundary; and B5) Dry and solidify the graphite glue.

4. The method for making a transformer graphite glue electrostatic ring according to claim 3, wherein step A comprises the following steps: A1) bonding a plurality of stacked paperboards to form a ring core semi-finished product; and A2) machining the semi-finished ring core to obtain the ring core, wherein the semi-finished ring core is machined through the steps of sawing bevels, openings, chamfers, and fine drilling to obtain the ring core with a preset shape, chamfers, hole positions, and openings.

5. The method for making a transformer graphite glue electrostatic ring according to claim 4, wherein step E further comprises the following steps: Ey) a corrugated paper tube is sheathed on the outside of a lead-out wire; Ez) bonding and fixing the crepe paper tube to a cross-shaped opening of the second crepe paper.

6. The method for manufacturing a transformer graphite glue electrostatic ring according to claim 5, wherein step A1 comprises the following steps: A11) cutting the paper to provide the paperboard of a preset quantity and preset size; A12) drying, wherein the drying temperature is 105°C ± 5°C and the drying time is more than 12 hours; A13) applying glue to the paperboard, wherein the gluing is applied on both sides; A14) cold pressing the glue coated paperboard by a press; and A15) Static storage: Leave the press for more than 12 hours.

7. A transformer graphite glue electrostatic ring, characterized in that: The method for making the graphite glue electrostatic ring comprises the following steps: A) Make a ring core; B) coating graphite glue at a preset position of the ring core to form a graphite glue layer on the ring core; C) measuring the resistance value between the end diagonals, and determining whether the resistance value is within a preset resistance value range; D) installing a potential line; and E) forming a coating layer; If the resistance value measured in step C is not within the preset resistance value range, repeat step B, and if the resistance value measured in step C is within the preset resistance value range, proceed to step D; The ring core comprises a ring core body, a non-outlet end extending integrally from the ring core body, and an outlet end extending integrally from the ring core body, wherein the graphite glue is coated on the non-outlet end and the outlet end, wherein the graphite glue is prepared by mixing a black main agent and a curing agent in a ratio of 100:3; The ring core is formed by stacking a plurality of cardboards and pasting them together with casein; Wherein step E comprises the following steps: E1) wrapping a metal corrugated paper around a surface of a ring core body of the ring core; E2) coating a second corrugated paper on the outer side of a graphite rubber layer without a lead-out end of the ring core and a graphite rubber layer with a lead-out end of the ring core; and E3) Wrapping a third crepe paper around the outer sides of the metal crepe paper and the second crepe paper.

8. The transformer graphite glue electrostatic ring according to claim 7, wherein the preset resistance value ranges from 50 to 250Ω.

9. The transformer graphite glue electrostatic ring according to claim 8, wherein step B comprises the following steps: B1) Mark the glue application position; B2) Setting up boundary maintenance markers; B3) Apply graphite glue; B4) removing the boundary retaining marker and cleaning the graphite glue overflowed from the boundary; and B5) Dry and solidify the graphite glue.

10. The transformer graphite glue electrostatic ring according to claim 9, wherein step A comprises the following steps: A1) bonding a plurality of stacked paperboards to form a ring core semi-finished product; and A2) machining the semi-finished ring core to obtain the ring core, wherein the semi-finished ring core is machined through the steps of sawing bevels, openings, chamfers, and fine drilling to obtain the ring core with a preset shape, chamfers, hole positions, and openings.

11. The transformer graphite glue electrostatic ring according to claim 10, wherein step E further comprises the following steps: Ey) A corrugated paper tube is placed on the outside of a lead wire.

12. The transformer graphite glue electrostatic ring according to claim 11, wherein step A1 comprises the following steps: A11) cutting the paper to provide the paperboard of a preset quantity and preset size; A12) drying, wherein the drying temperature is 105°C ± 5°C and the drying time is more than 12 hours; A13) applying glue to the paperboard, wherein the gluing is applied on both sides; A14) cold pressing the glue coated paperboard by a press; and A15) Static storage: Leave the press for more than 12 hours.

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