Manufacturing method for transformer graphite adhesive electrostatic ring

Abstract

The present invention provides a manufacturing method for a transformer graphite adhesive electrostatic ring. The manufacturing method for a transformer graphite adhesive electrostatic ring comprises the following steps: A) manufacturing a ring core; B) coating a preset position of the ring core with a graphite adhesive to form a graphite adhesive layer on the ring core; C) measuring a resistance value between diagonal ends, and determining whether the resistance value is within a preset resistance value range or not; 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, and if the resistance value measured in step C is within the preset resistance value range, step D is carried out.

Description

Manufacturing method of transformer graphite glue electrostatic ring Technical Field

[0001] The present 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] A transformer electrostatic ring is 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] Traditionally, transformer electrostatic rings are made by gluing aluminum foil and casein glue to designated locations. However, this process can easily lead to wrinkles and bulging, which can affect the performance of the transformer electrostatic ring. Furthermore, this traditional method of gluing aluminum foil and casein glue fails to control the resistance of the transformer electrostatic ring, resulting in unstable performance.

[0004] Summary of the Invention

[0005] 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.

[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 adding aluminum foil and casein glue is replaced by coating with graphite glue, thereby avoiding the occurrence of undesirable phenomena such as wrinkles and bulging.

[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 adding aluminum foil and casein glue is replaced by coating with graphite glue, so that the resistance value of the electrostatic ring can be controlled.

[0008] Another object of the present invention is to provide a method for manufacturing a transformer graphite glue electrostatic ring, wherein the traditional process of aluminum foil and casein gluing is replaced by coating with graphite glue, so that the resistance value of the electrostatic ring is controllable, thereby ensuring the stable performance of the electrostatic ring.

[0009] 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:

[0010] A) making a ring core;

[0011] B) coating graphite glue on a predetermined position of the ring core to form a graphite glue layer on the ring core;

[0012] C) measuring the resistance between the end corners and determining whether the resistance is within a predetermined resistance range;

[0013] D) installing a potential line; and

[0014] E) forming a coating layer;

[0015] If the resistance value measured in step C is not within the preset resistance value range, step B is repeated. If the resistance value measured in step C is within the preset resistance value range, step D is performed.

[0016] According to an embodiment of the present invention, the preset resistance value ranges from 50 to 250Ω.

[0017] According to one 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.

[0018] According to one embodiment of the present invention, step B includes the following steps:

[0019] B1) Mark the glue application position;

[0020] B2) Setting up boundary maintenance markers;

[0021] B3) Apply graphite glue;

[0022] B4) removing the boundary retaining marker and cleaning the graphite glue overflowing from the boundary; and

[0023] B5) Drying and curing the graphite glue.

[0024] According to one embodiment of the present invention, step A includes the following steps:

[0025] A1) bonding a plurality of stacked paperboards to form a ring core semi-finished product; and

[0026] A2) machining the semi-finished ring core product to obtain the ring core, wherein the semi-finished ring core product is machined by sawing bevels, openings, chamfering, finishing and punching, etc. to obtain the ring core with a preset shape, chamfering, hole position, and opening.

[0027] According to one embodiment of the present invention, step E includes the following steps:

[0028] E1) wrapping a metal corrugated paper around a surface of a ring core body of the ring core;

[0029] E2) wrapping a second crepe paper around the outer sides of a graphite rubber layer without a wire outlet end of the ring core and a graphite rubber layer with a wire outlet end of the ring core; and

[0030] E3) Wrapping a third crepe paper around the outside of the first crepe paper and the second crepe paper.

[0031] According to one embodiment of the present invention, step E further includes the following steps:

[0032] Ey) placing a corrugated paper tube on the outside of a lead wire;

[0033] Ez) bonding and fixing the crepe paper tube to a cross-shaped opening of the second crepe paper.

[0034] According to one embodiment of the present invention, step A1 includes the following steps:

[0035] A11) cutting the paper to provide a predetermined quantity and a predetermined size of the paperboard;

[0036] A12) drying, wherein the drying temperature is 105°C ± 5°C and the drying time is at least 12 hours;

[0037] A13) Glue is applied to the paperboard, using double-sided gluing with a glue usage of 330-350 g / 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);

[0038] A14) cold pressing the glued paperboard with a press; and

[0039] A15) Static storage: Place the product in a cool, dry place for more than 12 hours after removing it from the press.

[0040] According to another aspect of the present invention, the present invention further provides a transformer graphite adhesive electrostatic ring, wherein the manufacturing method of the graphite adhesive electrostatic ring comprises the following steps:

[0041] A) making a ring core;

[0042] B) coating graphite glue on a predetermined position of the ring core to form a graphite glue layer on the ring core;

[0043] C) measuring the resistance between the end corners and determining whether the resistance is within a predetermined resistance range;

[0044] D) installing a potential line; and

[0045] E) forming a coating layer;

[0046] If the resistance value measured in step C is not within the preset resistance value range, step B is repeated. If the resistance value measured in step C is within the preset resistance value range, step D is performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is a flow chart of a method for manufacturing a transformer graphite glue electrostatic ring according to a first preferred embodiment of the present invention.

[0048] FIG2 is a schematic diagram of the manufacturing process of the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0049] FIG3 illustrates the steps of making the ring core in the method for making the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0050] FIG4 is a schematic diagram of the manufacturing process of a ring core of the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0051] FIG5 illustrates the step of coating graphite glue in the method for manufacturing the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0052] FIG6 is a schematic diagram of a graphite glue coating process of the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0053] FIG7 illustrates the step of forming a coating layer in the method for manufacturing the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0054] FIG8 is a schematic diagram of a process of forming a coating layer of the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0055] FIG9 is a cross-sectional view of the transformer graphite glue electrostatic ring according to the first preferred embodiment of the present invention.

[0056] FIG10 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.

[0057] FIG11 is a schematic diagram of the manufacturing process of the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention.

[0058] FIG12 illustrates the steps of making the ring core in the method for making the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention.

[0059] FIG13 is a schematic diagram of the manufacturing process of a ring core of the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention.

[0060] FIG14 illustrates the step of coating graphite glue in the method for manufacturing the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention.

[0061] FIG15 is a schematic diagram of a graphite glue coating process of the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention.

[0062] FIG16 illustrates the step of forming a coating layer in the method for manufacturing the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention.

[0063] FIG17 is a schematic diagram of a process of forming a coating layer of the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention.

[0064] FIG18 is a cross-sectional view of the transformer graphite glue electrostatic ring according to the second preferred embodiment of the present invention. DETAILED DESCRIPTION

[0065] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0066] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying 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 operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0067] 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 elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0068] FIG1 of the accompanying drawings illustrates a method for manufacturing a transformer graphite adhesive electrostatic ring according to a first preferred embodiment of the present invention, wherein the transformer graphite adhesive electrostatic ring is a graphite adhesive electrostatic ring for a transformer. Referring to FIG1 , the method for manufacturing the transformer graphite adhesive electrostatic ring includes the following steps:

[0069] A) making a ring core 10; and

[0070] B) coating graphite glue on a predetermined position of the ring core 10 to form a graphite glue layer 20 on the ring core 10 .

[0071] According to this first preferred embodiment of the present invention, the ring core 10 is a seamless, full-circle laminated paperboard. Specifically, the ring core 10 is a seamless, full-circle laminated paperboard bonded with casein. The ring core 10 is made from a plurality of paperboards 101. These paperboards 101 are stacked and bonded together using casein 102, which is permeated into the paperboards 101, thereby firmly bonding each paperboard 101 to adjacent paperboards 101.

[0072] Referring to FIG. 4 of the accompanying drawings, a plurality of cardboard sheets 101 are stacked and bonded together by casein 102 to form a ring core semi-finished product 109 having a predetermined thickness. The ring core semi-finished product 109 has a predetermined thickness and a predetermined extension length. The ring core semi-finished product 109 needs to be further processed into a predetermined shape.

[0073] Specifically, step A includes the following steps:

[0074] A1) bonding a plurality of stacked paperboards to form a ring core semi-finished product 109; and

[0075] A2) machining the ring core semi-finished product 109 to obtain the ring core 10, wherein the ring core semi-finished product 109 is processed by finishing steps such as sawing bevels, openings, chamfers, and finishing punching to obtain the ring core 10 with a preset shape, chamfers, hole positions, and openings.

[0076] According to the first preferred embodiment of the present invention, step A1 comprises the following steps:

[0077] A11) Cutting the paper to provide a preset quantity and size of paperboard;

[0078] According to the first preferred embodiment of the present invention, step A1 further comprises the following steps:

[0079] A12) drying, wherein the drying temperature is 105°C ± 5°C and the drying time is at least 12 hours;

[0080] A13) Glue is applied to the paperboard, using double-sided gluing with a glue usage of 330-350 g / 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);

[0081] A14) cold pressing the glued paperboard with a press; and

[0082] A15) Static Placement: Place the press aside for at least 12 hours. Referring to Figure 3 of the accompanying drawings, step A2 includes the following steps:

[0083] A21) punching to form a potential line hole 100 in the ring core semi-finished product 109.

[0084] According to the first preferred embodiment of the present invention, the transformer graphite glue electrostatic ring is a non-uniform electrostatic ring. Step A2 further includes the following steps:

[0085] A22) milling, so that the overall size profile of the ring core 10 meets the requirements of the preset non-uniform electrostatic ring.

[0086] According to the first preferred embodiment of the present invention, step A further comprises the following steps:

[0087] A3) Re-drying: Place the processed product in a drying oven, slowly heat and dry it for more than 6 hours.

[0088] According to this first preferred embodiment of the present invention, step B comprises the following steps:

[0089] B1) Marking the glue application position: setting two marking lines 107 and 108 at the preset positions of the ring core 10;

[0090] B2) Setting a boundary maintaining marker X;

[0091] B3) Apply graphite glue;

[0092] B4) removing the boundary retaining marker and cleaning the graphite glue overflowing from the boundary; and

[0093] B5) Drying and curing the graphite glue.

[0094] According to this first preferred embodiment of the present invention, step B2 places a removable boundary marker X at a predetermined position. This facilitates the application of graphite glue in step B3. Step B2 places removable markers 110 mm inward and 12 mm outward. The boundary marker X does not absorb the graphite glue applied thereto. In other words, the boundary marker X is made of a graphite-resistant material, so that even if graphite glue is accidentally applied to the boundary marker X, it will not affect the position of the graphite glue on the ring core 10. According to this first preferred embodiment of the present invention, the boundary marker X is a paper tape.

[0095] It is worth noting that, compared to the conventional process of gluing aluminum foil with casein glue to a designated location, this first preferred embodiment of the present invention utilizes a graphite adhesive coating process instead. This not only avoids undesirable phenomena such as wrinkles and bulging, but also allows the resistance value of the transformer electrostatic ring to be controlled, thereby maintaining the resistance value of the transformer electrostatic ring within a preset range. According to this first preferred embodiment of the present invention, the resistance value of the transformer electrostatic ring is 50 to 250 Ω.

[0096] 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.

[0097] According to this first preferred embodiment of the present invention, the method for manufacturing a transformer graphite adhesive electrostatic ring includes a resistance measurement step to ensure that the resistance of the transformer electrostatic ring is within a preset range. If the resistance value does not meet the requirements, a second application of graphite adhesive is performed, followed by drying. After complete drying, 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.

[0098] Specifically, the transformer graphite glue electrostatic ring manufacturing method further includes the following steps:

[0099] C) Measure the resistance between opposite corners of the end.

[0100] If the resistance value measured in step C is not within the preset range, repeat step B.

[0101] If the resistance value measured in step C is within the preset range, proceed to the following steps:

[0102] D) installing a potential line; and

[0103] E) forming a coating layer.

[0104] 2 of the accompanying drawings, the transformer electrostatic ring includes a ring core 10 , a graphite adhesive layer 20 , a potential line 30 and a covering layer 40 .

[0105] 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.

[0106] 2 of the accompanying drawings, the potential line 30 includes a lead line 31 and a connecting line 32 .

[0107] Referring to Figure 9 of the accompanying drawings, the lead wire 31 and the connecting wire 32 are connected as a single unit. Specifically, the lead wire 31 is doubled and welded to the connecting wire 32 to form a welded joint 60. According to the first preferred embodiment of the present invention, the welded joint 60 is positioned within the point line hole 100 of the ring core 10. The metal corrugated paper 41 wraps around the connecting wire 32 of the potential wire 30 and secures it to the ring core body 11.

[0108] 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 wire hole 100 so that the potential wire 30 can be led out.

[0109] Specifically, the ring core 10 extends in a ring shape and has an opening 1000. More specifically, the ring core 10, which extends 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 adhesive layer 21 is formed on the non-outlet end 12, and the wire-outlet end graphite adhesive layer 22 is formed on the wire-outlet end 13. Specifically, the non-outlet end graphite adhesive layer 21 is coated on the surface of the non-outlet end 12, and the wire-outlet end graphite adhesive layer 22 is coated on the surface of the wire-outlet end 13.

[0110] More specifically, the non-outlet terminal 12 forms a first graphite adhesive coating surface 121. The outlet terminal 13 forms a second graphite adhesive coating surface 131. The non-outlet terminal graphite adhesive layer 21 of the graphite adhesive layer 20 is coated on the first graphite adhesive coating surface 121. The outlet terminal graphite adhesive layer 22 of the graphite adhesive layer 20 is coated on the second graphite adhesive coating surface 131.

[0111] The end of the connecting wire 32 has a predetermined overlap length with the graphite adhesive layer 21 applied to the terminal 12. The end is tinned to prevent rust and bifurcation. According to the first preferred embodiment of the present invention, the predetermined overlap length is 50 mm. According to the first preferred embodiment of the present invention, the connecting wire 32 is fixed by dispensing a mixture of graphite adhesive and 502.

[0112] According to this 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. The metal corrugated paper 41 is wrapped around the surface of the ring core body 11. The second corrugated paper 42 is wrapped around the surfaces corresponding to the non-outlet terminal 12 and the outlet terminal 13. In other words, the second corrugated paper 42 is wrapped around the outside of the non-outlet terminal graphite adhesive layer 21 and the outlet terminal graphite adhesive layer 22. Furthermore, the third corrugated paper 43 is wrapped around the outside of the first corrugated paper 41 and the second corrugated paper 42.

[0113] Specifically, step E includes the following steps:

[0114] E1) wrapping the metal corrugated paper 41 around the surface of the ring core body 11;

[0115] E2) wrapping the second crepe paper 42 on the outer sides of the graphite adhesive layer 21 without a wire outlet and the graphite adhesive layer 22 with a wire outlet; and

[0116] E3) Wrapping the third crepe paper 43 around the outside of the first crepe paper 41 and the second crepe paper 42 .

[0117] According to this first preferred embodiment of the present invention, the aluminum foil surface of the metal corrugated paper 41 overlaps the graphite adhesive electrode areas at both ends by 60 mm, covering the perforations on the outer sides of the potential line. The ends of the metal corrugated paper 41 are rounded to R10 degrees. The metal corrugated paper 41 is wrapped using a 1 / 2 overlap method. After wrapping, the resistance between the lead wire 31 of the potential line 30 and the graphite adhesive layer 20 is measured. Tests show that the resistance between the lead wire 31 of the potential line 30 and the graphite adhesive layer 20 is between 50 and 250 Ω.

[0118] According to the first preferred embodiment of the present invention, before step E2, step E further includes the following steps:

[0119] Ex: Measure the resistance between the lead wire 31 of the potential wire 30 and the graphite adhesive layer 20 to confirm whether it is within a preset resistance range.

[0120] 2 of the accompanying drawings, the transformer graphite adhesive 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.

[0121] Specifically, step E2 includes the following steps:

[0122] E21: Cut a cross-shaped opening on the second crepe paper 42;

[0123] E22: passing through the cross-shaped opening and fixing the cross-shaped opening to the end where the lead wire 31 intersects the ring core 10; and

[0124] E23: Wrap the second crepe paper 42 around the outer sides of the graphite adhesive layer 21 without a wire outlet and the graphite adhesive layer 22 with a wire outlet.

[0125] According to this first preferred embodiment of the present invention, step E comprises the following steps:

[0126] Ey) a corrugated paper tube 70 is sheathed on the outside of the lead wire 31;

[0127] Ez) bonding and fixing the crepe paper tube 70 to the cross-shaped opening of the second crepe paper 42.

[0128] 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.

[0129] Step E3 stretches the third crepe paper 43 and applies it to the upper and lower portions of the ring core 10. The third crepe paper 43 must be butted against the side crepe paper, not overlapping it. The starting and ending positions are approximately 2 mm apart from the previous layer. The third crepe paper 43 is wrapped with a 1 / 2 overlap, starting from the end and wrapping slightly over 110 mm. This constitutes one round, and this round is repeated until the desired thickness is reached.

[0130] FIG10 of the accompanying drawings illustrates a method for manufacturing a transformer graphite adhesive electrostatic ring according to a second preferred embodiment of the present invention. Referring to FIG10 , the method for manufacturing a transformer graphite adhesive electrostatic ring includes the following steps:

[0131] A') making a ring core 10A; and

[0132] B′) coating graphite glue on a predetermined position of the ring core 10A to form a graphite glue layer 20A on the ring core 10A.

[0133] According to the second preferred embodiment of the present invention, the ring core 10A is a seamless, full-circle laminated paperboard. Specifically, the ring core 10A is a seamless, full-circle laminated paperboard bonded with casein. The ring core 10A is made from a plurality of paperboards 101A. The plurality of paperboards 101A are stacked and bonded together using casein 102A, wherein the casein 102A is permeated through the paperboards 101A, thereby firmly bonding each paperboard 101A to adjacent paperboards 101A.

[0134] Referring to FIG. 13 of the accompanying drawings, a plurality of cardboard sheets 101A are stacked and bonded together using casein 102A to form a ring core semi-finished product 109A having a predetermined thickness. The ring core semi-finished product 109A has a predetermined thickness and a predetermined extension length. The ring core semi-finished product 109A may further be processed into a predetermined shape.

[0135] Specifically, step A' comprises the following steps:

[0136] A1') making a ring core semi-finished product 109A: bonding a plurality of stacked paperboards 101A to form the ring core semi-finished product 109A; and

[0137] A2) machining the ring core semi-finished product 109A to obtain the ring core 10A, wherein the ring core semi-finished product 109A is processed by 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.

[0138] According to the second preferred embodiment of the present invention, step A1' comprises the following steps:

[0139] A11') cutting the paper to provide a preset quantity and size of paperboard 101A;

[0140] A12) drying, wherein the drying temperature is 105°C ± 5°C and the drying time is at least 12 hours;

[0141] A13) applying glue to the paperboard, using double-sided glue application at a glue dosage of 330-350 g / cm² (liquid glue on one side). Considering the adhesion between the container and the fiber brush surface, the recommended glue dosage is 370-380 g / cm² (liquid glue on one side). The double-sided glue dosage should be 170 g x2 / cm² (liquid glue);

[0142] A14) cold pressing the glued paperboard with a press; and

[0143] A15) Static storage: Place the product in a cool, dry place for more than 12 hours after removing it from the press.

[0144] According to the second preferred embodiment of the present invention, the transformer graphite glue electrostatic ring is a uniform electrostatic ring.

[0145] Referring to FIG. 12 of the accompanying drawings, step A2′ includes the following steps:

[0146] A21 ') punching to form a potential line hole 100A in the ring core semi-finished product 109A; and

[0147] A23') is chamfered so that the edge of the ring core 10A has a preset chamfer.

[0148] According to the second preferred embodiment of the present invention, step A' further comprises the following steps:

[0149] A3') Re-drying: Place the processed product in a drying oven, slowly heat and dry for more than 6 hours.

[0150] According to this second preferred embodiment of the present invention, step B' comprises the following steps:

[0151] B1') marking the glue application positions 107A and 108A;

[0152] B2') Setting boundary maintenance markers;

[0153] B3') Apply graphite glue;

[0154] B4′) removing the boundary retaining marker and cleaning the graphite glue overflowing from the boundary; and

[0155] B5') Drying and curing the graphite glue.

[0156] According to the second preferred embodiment of the present invention, step B2' sets a removable boundary retaining marker X' at a preset position. So that step B3' can be performed to apply graphite glue. 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 a graphite glue-proof 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.

[0157] It is worth noting that, compared to the conventional process of gluing aluminum foil and cheese glue to a designated location, the second preferred embodiment of the present invention utilizes a graphite adhesive coating process instead. This not only avoids undesirable phenomena such as wrinkles and bulging, but also allows the resistance value of the transformer electrostatic ring to be controlled, thereby maintaining the resistance value of the transformer electrostatic ring 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.

[0158] According to the second preferred embodiment of the present invention, the method for manufacturing a transformer graphite adhesive electrostatic ring includes a resistance measurement step to ensure that the resistance of the transformer electrostatic ring is within a preset range. If the resistance value does not meet the requirements, a second application of graphite adhesive is performed, followed by drying. After complete drying, the resistance is measured again to determine whether it falls within the preset resistance range. If the resistance value is not within the preset range, step B' is repeated. If the resistance value is still within the preset range, the subsequent steps are performed.

[0159] Specifically, the transformer graphite glue electrostatic ring manufacturing method further includes the following steps:

[0160] C') Measure the resistance between opposite corners of the end.

[0161] If the resistance value measured in step C' is not within the preset range, repeat step B'.

[0162] If the resistance value measured in step C' is within the preset range, proceed to the following steps:

[0163] D') installing a potential line; and

[0164] E') forming a coating layer.

[0165] 11 of the accompanying drawings, the transformer electrostatic ring includes a ring core 10A, a graphite adhesive layer 20A, a potential line 30A and a covering layer 40A.

[0166] 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.

[0167] Referring to Figure 11 of the accompanying drawings, 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 single unit. Specifically, the lead line 31A is doubled and welded to the connecting line 32A to form a welded joint 60A. According to the second preferred embodiment of the present invention, the welded joint 60A is disposed within the point position line hole 100A of the ring core 10A.

[0168] According to this second preferred embodiment of the present invention, step D' comprises the following steps:

[0169] D1') double folded lead wire 31A;

[0170] 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;

[0171] 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.

[0172] Referring to FIG. 18 of the accompanying drawings, the potential wire hole 100A is provided at one end of the ring core 10A and has a first potential wire hole end 1001A near the other end of the ring core 10A and a second potential wire hole end 1002A away from the other end of the ring core 10A. After the connected lead wire 31A and the connecting wire 32A pass through the potential wire hole 100A, the welded connection 60A is retained within the potential wire hole 100A, wherein the connecting wire 32A passes through the potential wire hole 100A to the outside of the potential wire hole first end 1001A, and the lead wire 31A passes through the potential wire hole 100A to the second potential wire hole end 1002A and continues to extend outside the ring core 10A to the other end of the ring core 10A.

[0173] The graphite adhesive layer 20A includes a graphite adhesive layer 21A without a lead-out terminal and a graphite adhesive layer 22A with a lead-out terminal. The graphite adhesive layer 22A with a lead-out terminal has a lead-out hole 220A connected to the potential wire hole 100A so that the connection wire 32A can be led out.

[0174] Specifically, the ring core 10A extends in a ring shape and has an opening 1000A. More specifically, the ring core 10A 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. 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 adhesive layer 21A is formed on the non-outlet end 12A, and the wire-outlet end graphite adhesive layer 22A is formed on the wire-outlet end 13A. Specifically, the non-outlet end graphite adhesive layer 21A is coated on the surface of the non-outlet end 12A, and the outlet end graphite adhesive layer 22A is coated on the surface of the outlet end 13A.

[0175] More specifically, the non-outlet terminal 12A forms a first graphite adhesive coating surface 121A. The outlet terminal 13A forms a second graphite adhesive coating surface 131A. The non-outlet terminal graphite adhesive layer 21A of the graphite adhesive layer 20A is coated on the first graphite adhesive coating surface 121A. The outlet terminal graphite adhesive layer 22A of the graphite adhesive layer 20A is coated on the second graphite adhesive 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.

[0176] The end of the potential wire 30A has a predetermined overlap length with the graphite adhesive layer 21A applied to the terminal 12A. The end is tinned to prevent rust and bifurcation. According to the second preferred embodiment of the present invention, the predetermined overlap length is 50 mm. According to the second preferred embodiment of the present invention, the potential wire 30A is fixed by dispensing a mixture of graphite adhesive and 502.

[0177] Referring to FIG. 18 of the accompanying drawings, the potential wire hole 100A is provided at the wire-outlet end 13A of the ring core 10A and has a first potential wire hole end 1001A proximal to the non-wire-outlet end 12A of the ring core 10A and a second potential wire hole end 1002A distal to the non-wire-outlet end 12A of the ring core 10A. After the connected lead wire 31A and the connecting wire 32A pass through the potential wire hole 100A, the soldered connection 60A is retained within the potential wire hole 100A. The connecting wire 32A extends out of the first potential wire hole end 1001A of the potential wire hole 100A, while the lead wire 31A extends out of the second potential wire hole end 1002A of the potential wire hole 100A and continues to extend outside the ring core 10A, reaching the non-wire-outlet end 12A 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.

[0178] 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. The metal corrugated paper 41A is wrapped around the surface of the ring core body 11A. The second corrugated paper 42A is wrapped around the surface corresponding to the non-outlet end 12A and the outlet end 13A. In other words, the second corrugated paper 42A is wrapped around the outside of the non-outlet end graphite adhesive layer 21A and the outlet end graphite adhesive layer 22A. Furthermore, the third corrugated paper 43A is wrapped around the outside of the first corrugated paper 41A and the second corrugated paper 42A. The metal corrugated paper 41A partially covers the potential wire 30A and secures it to the ring core body 11A.

[0179] Specifically, step E' comprises the following steps:

[0180] E1′) wrapping the metal corrugated paper 41A around the surface of the ring core body 11A;

[0181] E2′) wrapping the second crepe paper 42A around the outer sides of the graphite adhesive layer 21A without a wire outlet and the graphite adhesive layer 22A with a wire outlet; and

[0182] E3′) Wrapping the third crepe paper 43A around the outside of the first crepe paper 41A and the second crepe paper 42A.

[0183] According to this second preferred embodiment of the present invention, the aluminum foil surface of the metal corrugated paper 41A overlaps the graphite adhesive electrode areas at both ends by 60 mm, covering the perforations outside the potential line. The ends of the metal corrugated paper 41A are rounded to R10 degrees. The metal corrugated paper 41A is wrapped using a 1 / 2 overlap method. After wrapping, the resistance between the lead wire 30A and the graphite adhesive layer 20A is measured. Tests show that the resistance between the lead wire 30A and the graphite adhesive layer 20A is between 50 and 250 Ω.

[0184] According to the second preferred embodiment of the present invention, before step E2, step E further includes the following steps:

[0185] Ex′: Measure the resistance between the outlet of the potential line 30A and the graphite adhesive layer 20A to confirm whether it is within a preset resistance range.

[0186] Referring to Figure 11 of the accompanying drawings, the transformer graphite adhesive 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 and fixed to the second corrugated paper 42A.

[0187] Specifically, step E2 includes the following steps:

[0188] E21': Cut a cross-shaped opening on the second crepe paper 42A;

[0189] E22': passing through the cross-shaped opening and fixing the cross-shaped opening to the end where the lead wire 31A intersects the ring core 10A; and

[0190] E23 ′: Wrap the second crepe paper 42A around the outer sides of the graphite adhesive layer 21A without a wire outlet and the graphite adhesive layer 22A with a wire outlet.

[0191] According to this second preferred embodiment of the present invention, step E' comprises the following steps:

[0192] Ey') a corrugated paper tube 70A is sheathed on the outside of the lead wire 31A;

[0193] The crepe paper tube 70A is glued and fixed to the cross-shaped opening of the second crepe paper 42A.

[0194] 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.

[0195] Step E3': Stretch the third crepe paper 43A and apply it to the upper and lower portions of the ring core 10A. The third crepe paper 43A must be butted against the side crepe paper, not overlapping it. The starting and ending positions are approximately 2 mm apart from the previous layer. The third crepe paper 43A is wrapped with a 1 / 2 overlap, starting from the end and wrapping slightly over 110 mm. This constitutes one round, and this round is repeated until the desired thickness is reached.

[0196] It should be noted that in the apparatus and method of the present application, the components or steps in different embodiments may be decomposed and / or recombined without departing from the principles of the present invention. Such decomposition and / or recombination should be considered as included within the inventive concept of the present application.

[0197] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A method for making a transformer graphite glue electrostatic ring, characterized in that: The following steps are involved: A) making 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, step B is repeated, and if the resistance value measured in step C is within the preset resistance value range, step D is performed.

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

3. The method for making a transformer graphite glue electrostatic ring according to claim 2, wherein the graphite glue is prepared by mixing a black main agent and a curing agent in a ratio of 100:

3.

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

5. The method for making a transformer graphite glue electrostatic ring according to claim 4, 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 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.

6. The method for making a transformer graphite glue electrostatic ring according to claim 5, 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 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 E3) Wrapping a third crepe paper around the outer sides of the first crepe paper and the second crepe paper.

7. The method for making a transformer graphite glue electrostatic ring according to claim 6, 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.

8. The method for manufacturing a transformer graphite glue electrostatic ring according to claim 7, 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 double-sided gluing is adopted; A14) cold pressing the glue coated paperboard by a press; and A15) Static storage: Leave the machine to stand for more than 12 hours.

9. A transformer graphite glue electrostatic ring, characterized in that: The method for making the graphite glue electrostatic ring comprises the following steps: A) making 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, step B is repeated, and if the resistance value measured in step C is within the preset resistance value range, step D is performed.

10. The transformer graphite glue electrostatic ring according to claim 9, wherein the preset resistance value ranges from 50 to 250Ω.

11. The transformer graphite glue electrostatic ring according to claim 10, wherein the graphite glue is prepared by mixing a black main agent and a curing agent in a ratio of 100:

3.

12. The transformer graphite glue electrostatic ring according to claim 11, wherein step B comprises the following steps: B1) Mark the glue application position; B2) Setting boundary maintenance markers; B3) Apply graphite glue; B4) removing the boundary retaining marker and cleaning the graphite glue overflowing from the boundary; and B5) Drying and curing the graphite glue.

13. The transformer graphite glue electrostatic ring according to claim 12, 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 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.

14. The transformer graphite glue electrostatic ring according to claim 13, 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 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 E3) Wrapping a third crepe paper around the outer sides of the first crepe paper and the second crepe paper.

15. The transformer graphite glue electrostatic ring according to claim 14, wherein step E further comprises the following steps: Ey) A corrugated paper tube is sleeved on the outside of a lead-out line.

16. The transformer graphite glue electrostatic ring according to claim 15, 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 double-sided gluing is adopted; A14) cold pressing the glue coated paperboard by a press; and A15) Static storage: Leave the machine to stand for more than 12 hours.

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