Body coil structure suitable for automatic pressure gel voltage transformer and manufacturing method

Abstract

The present invention belongs to the technical field of automatic pressure gel voltage transformer, and particularly relates to a body coil structure and manufacturing method suitable for automatic pressure gel voltage transformer. The structure includes an iron core and a secondary coil and a primary coil wound on the iron core from the inside to the outside. A skeleton is provided on the outside of the core column of the iron core, and the secondary coil is wound on the skeleton. The two sides of the secondary coil and the iron core are sealed by sealant. A main insulating layer is provided between the secondary coil and the primary coil. A high-voltage shielding layer is provided on the outside of the primary coil. The high-voltage shielding layer is located on both sides of the inner cavity of the iron core and has multiple through holes. The outside of the iron core is wrapped with an insulating buffer layer and a low-voltage shielding layer. The present invention avoids the iron core from entering the resin, is conducive to the discharge of pressure injection gas, and the product has a small partial discharge, thereby ensuring the safe operation of the product, and providing a favorable guarantee for the batch manufacturing and quality control of voltage transformers.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic pressure gel voltage transformers, and in particular relates to a body coil structure suitable for automatic pressure gel voltage transformers and a manufacturing method thereof. Background Art

[0002] At present, when making voltage transformers in the transformer industry, the coil manufacturing method generally winds the primary and secondary coils first, and then assembles the iron core. The iron core wrapped with insulation buffer is very easy to get resin, which affects the stability of the iron core performance. At the same time, the pressure injection coil structure of the automatic pressure gel equipment in the inflated state affects the exhaust, which is bound to have a great impact on the partial discharge of the product performance. With the continuous improvement of the product technical requirements for metal-enclosed switchgear (referred to as C-GIS inflatable cabinet) with SF6 as the insulating medium, the design level of the transformer must also be continuously improved. At present, the coil structure and manufacturing method of the body have not fundamentally solved the problems of difficulty in entering the iron core with resin and pressure injection exhaust of the coil body. Therefore, there is an urgent need for a more complete and advanced body coil structure and manufacturing method suitable for automatic pressure gel voltage transformers, so as to further improve the design and manufacturing level of voltage transformers. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a body coil structure and manufacturing method suitable for automatic pressure gel voltage transformer, so as to solve the problems of difficulty in resin injection into the existing voltage transformer core and pressure injection and exhaust of the coil body.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] On the one hand, the present invention provides a body coil structure suitable for an automatic pressure gel voltage transformer, comprising an iron core and a secondary coil and a primary coil wound on the iron core from the inside to the outside, a skeleton is provided on the outside of the core column of the iron core, the secondary coil is wound on the skeleton, both sides of the secondary coil and the iron core are sealed by sealant, a main insulating layer is provided between the secondary coil and the primary coil, a high-voltage shielding layer is provided on the outside of the primary coil, the high-voltage shielding layer is located on both sides of the inner cavity of the iron core and has multiple through holes, and the outside of the iron core is wrapped with an insulating buffer layer and a low-voltage shielding layer.

[0006] The skeleton is a cylindrical structure wound by insulating paperboard sandwiched with capacitor composite paper; the interlayer insulation of the secondary coil adopts capacitor composite paper; the main insulating layer is insulating paperboard and capacitor composite paper arranged from inside to outside.

[0007] Shielding copper foil, semi-conductive corrugated paper and capacitor composite paper are sequentially added to the outside of the main insulating layer, wherein gaps are left at the head and tail ends of the shielding copper foil, an N-end insulated wire is welded on the shielding copper foil to lead out, and a piece of shaped copper foil is led out from one end of the shielding copper foil and welded to the enameled wire of the primary coil.

[0008] The high-voltage shielding layer is made of a whole sheet of semi-conductive corrugated paper I wrapped around the outside of the primary coil, silicone strips are pressed on the long sides of the two sides of the semi-conductive corrugated paper I, and multiple through holes are symmetrically punched on both sides of the end of the semi-conductive corrugated paper I, and the middle through hole is located at the bottom of the primary coil.

[0009] The iron core is two butt-jointed C-shaped iron cores, and the exposed C-shaped iron core cross-section joints are bonded with glue;

[0010] The insulating buffer layer includes a half-lapped PVC self-adhesive tape, a heat shrink sleeve, a foamed silicone plate and a butt-jointed PVC self-adhesive tape which are arranged in sequence from the inside to the outside, wherein the half-lapped PVC self-adhesive tape is wrapped around the outside of the C-shaped iron core in at least two layers and is wrapped around the C-shaped iron core cross-section joints at both ends of the C-shaped iron core; the heat shrink sleeve is coated around the part of the iron core except the core column, and the heat shrink sleeve is used for insulation and sealing; the outside of the heat shrink sleeve is wrapped with a foamed silicone plate for insulation and buffering, and then wrapped with the butt-jointed PVC self-adhesive tape to seal it.

[0011] The low-voltage shielding layer is formed by half-folding and shielding wrapping with semi-conductive crepe paper II.

[0012] Another aspect of the present invention provides a method for manufacturing the body coil structure suitable for the automatic pressure gel voltage transformer as described above, comprising the following steps:

[0013] Step S1: Winding the secondary coil;

[0014] Step S2: Winding a coil once;

[0015] Step S3: assembling the iron core;

[0016] Step S4: Conduct semi-finished product testing;

[0017] After the test, the exposed C-shaped core section joints were sealed with glue, and the gaps between the two side end faces of the secondary coil and the core were sealed with sealant;

[0018] Step S5: bandaging the body of the device;

[0019] Use foamed silicone sheet to insulate and buffer the iron core, seal the outside of the foamed silicone sheet with butt-jointed PVC self-adhesive tape, and then half-fold semi-conductive crepe paper II for shielding and wrapping to form a low-voltage shielding layer;

[0020] Step S6: device body test;

[0021] After the device body is wrapped, error, excitation characteristics and voltage withstand tests are carried out.

[0022] The process of winding the secondary coil is as follows: an insulating paperboard with capacitor composite paper is wound into a cylinder as a frame, an enameled wire is wound outside the frame, capacitor composite paper is used for interlayer insulation, and the insulating paperboard and capacitor composite paper are wound on the outermost side of the enameled wire to form a main insulating layer.

[0023] The process of winding the primary coil is as follows: a shielding copper foil is added to the outside of the wound secondary coil in the middle, leaving a gap at the head and tail ends, a primary N-end insulated wire is welded on the shielding copper foil to lead out, a formed copper foil is led out of the shielding copper foil and welded to the enameled wire of the primary coil, a layer of semi-conductive crepe paper is half-lapped on the outside of the shielding copper foil, capacitor composite paper is added to the outside of the semi-conductive crepe paper, and then the enameled wire is wound to form a primary coil;

[0024] A whole sheet of semi-conductive corrugated paper I is added to the primary coil, silicone strips are pressed on both long sides of the semi-conductive corrugated paper I, and multiple through holes are symmetrically punched on both sides of the end of the semi-conductive corrugated paper I, and the multiple through holes are located at the bottom of the primary coil.

[0025] The process of assembling the iron core is as follows: the iron core is two butt-jointed C-shaped iron cores, the two C-shaped iron cores are first wrapped with half-stacked PVC self-adhesive tape, and then a heat shrink sleeve is put on, the secondary coil and the primary coil are put on the core column of the iron core, and the two C-shaped iron cores are fixed with a steel belt, and the steel belt is located between the heat shrink sleeve and the half-stacked PVC self-adhesive tape.

[0026] The advantages and beneficial effects of the present invention are:

[0027] 1. Low cost, easy operation and simple and easy to implement: In the present invention, multiple circular holes are symmetrically punched on both sides of the outer shield of the primary coil, the end surface of the secondary coil is sealed with mixed silicone rubber, the silicone rubber heat shrink sleeve is used to insulate the iron core, and the joints of the C-shaped iron core section are sealed with glue. The overall process scheme is easy to operate and simple and easy to implement.

[0028] 2. Stable core performance: The gap between the end face of the secondary coil and the core of the present invention is sealed with mixed silicone rubber and naturally cured, and the core is insulated with a silicone rubber heat shrink sleeve, which is tightly combined with the core to prevent resin from entering. The external foamed silicone sheet will not cause great stress on the core due to the curing of the epoxy resin pressure injection gel, thereby making the voltage transformer core performance stable.

[0029] 3. Small local discharge and safe operation: The primary coil of the present invention is added with a high-voltage shielding layer formed by folding a whole sheet of semi-conductive corrugated paper in half, and a plurality of circular through holes are symmetrically punched on both sides when the coil is fixed. The through hole in the middle is directly opposite to the primary high-voltage lead-out line, which is beneficial to the discharge of gas during pressure injection. A layer of semi-conductive corrugated paper is folded outside the coil of the device body to form a low-voltage shielding layer. The high and low voltage shields work together to reduce the local discharge of the voltage transformer, thereby achieving the purpose of safe operation of the voltage transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a body coil structure suitable for an automatic pressure gel voltage transformer according to the present invention;

[0031] Figure 2 for Figure 1 Side view of

[0032] Figure 3 for Figure 1 A local enlarged view of point A in FIG.

[0033] Figure 4 for Figure 1 A local enlarged view of point B in FIG.

[0034] Figure 5 The present invention is a flowchart of a method for manufacturing a body coil structure suitable for an automatic pressure gel voltage transformer.

[0035] In the figure: 1-iron core, 2-secondary coil, 3-primary coil, 4-high voltage shielding layer, 5-main insulating layer, 6-skeleton, 7-through hole, 8-silicone strip, 9-semi-conductive crepe paper I, 10-half-folded PVC self-adhesive tape, 11-heat shrink sleeve, 12-foamed silicone sheet, 13-butting PVC self-adhesive tape, 14-semi-conductive crepe paper II, 15-C-type iron core section joint, 16-mixed silicone rubber. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] See also Figures 1 to 4 As shown, an embodiment of the present invention provides a body coil structure suitable for an automatic pressure gel voltage transformer, including an iron core 1 and a secondary coil 2 and a primary coil 3 wound on the iron core 1 from the inside to the outside, a skeleton 6 is provided on the outside of the core column of the iron core 1, the secondary coil 2 is wound on the skeleton 6, both sides of the secondary coil 2 and the iron core 1 are sealed by sealant, a main insulating layer 5 is provided between the secondary coil 2 and the primary coil 3, a high-voltage shielding layer 4 is provided on the outside of the primary coil 3, and a plurality of through holes 7 are provided on both sides of the high-voltage shielding layer 4 located on the inner cavity of the iron core 1, and an insulating buffer layer and a low-voltage shielding layer are wrapped on the outside of the iron core 1.

[0038] In the embodiment of the present invention, the skeleton 6 is a cylindrical structure wound by insulating paperboard sandwiched with capacitor composite paper; the interlayer insulation of the secondary coil 2 adopts capacitor composite paper, and the main insulating layer 5 is insulating paperboard and capacitor composite paper wound on the outside of the secondary coil 2 as insulation between the primary and secondary coils.

[0039] Furthermore, shielding copper foil, semi-conductive corrugated paper and capacitor composite paper are sequentially added to the outside of the main insulating layer 5, wherein gaps are left at the head and tail ends of the shielding copper foil, an N-end insulated wire is welded on the shielding copper foil to lead out, and a piece of shaped copper foil is led out from one end of the shielding copper foil and welded to the enameled wire of the primary coil 3.

[0040] See also Figure 4 As shown, in the embodiment of the present invention, the high-voltage shielding layer 4 is made of a whole sheet of semi-conductive crepe paper Ⅰ9 wrapped around the outside of the primary coil 3, and the long sides of the semi-conductive crepe paper Ⅰ9 are pressed with silicone strips 8, the width of the silicone strips 8 on the two sides is greater than the interlayer paper, and they are fixed with double-sided tape. A plurality of through holes 7 are symmetrically punched on both sides of the end of the semi-conductive crepe paper Ⅰ9, and the middle through hole 7 is located at the bottom of the primary coil 3, that is, the through hole 7 at the bottom is arranged opposite to the primary wiring terminal at the top of the primary coil 3.

[0041] See also Figure 1 Figure 3 As shown, in the embodiment of the present invention, the iron core 1 is two butt-jointed C-shaped iron cores, and the exposed C-shaped iron core cross-section joints 15 are bonded with glue. The insulating buffer layer includes a half-stacked PVC self-adhesive tape 10, a heat shrink sleeve 11, a foamed silicone plate 12 and a butt-jointed PVC self-adhesive tape 13 arranged in sequence from the inside to the outside, wherein the half-stacked PVC self-adhesive tape 10 is wrapped on the outside of the C-shaped iron core in at least two layers, and is wrapped to the C-shaped iron core cross-section joints 15 at both ends of the C-shaped iron core; the heat shrink sleeve 11 is wrapped on the part of the iron core 1 except the core column, and the heat shrink sleeve 11 is used for insulation and sealing; the outside of the heat shrink sleeve 11 is wrapped with a foamed silicone plate 12 for insulation buffering, and then wrapped with the butt-jointed PVC self-adhesive tape 13 to seal. The low-voltage shielding layer is formed by using semi-conductive crepe paper II 14 to perform a half-stacked shielding wrapping on the outside of the butt-jointed PVC self-adhesive tape 13.

[0042] Specifically, the heat shrink sleeve 11 is cylindrical in shape, and is smooth inside and outside. Preferably, the heat shrink sleeve 11 is made of silicone rubber.

[0043] An embodiment of the present invention provides a body coil structure suitable for an automatic pressure gel voltage transformer. The gap between the end face of the secondary coil 2 and the iron core 1 is sealed with a mixed silicone rubber 16 for natural curing. The iron core 1 is insulated with a silicone rubber heat shrink sleeve 11, which is tightly combined with the iron core 1 to prevent resin from entering. The outer foamed silicone sheet 12 will not cause the epoxy resin pressure injection gel curing to produce a large stress on the iron core 1, so that the performance of the voltage transformer iron core is stable. The primary coil 3 is added with a high-voltage shielding layer formed by folding a whole sheet of semi-conductive crepe paper in half, and when fixing the coil, multiple circular through holes 7 are symmetrically punched on both sides. The through hole 7 located in the middle is directly opposite to the primary high-voltage lead outlet on the opposite side, which is conducive to the discharge of gas during pressure injection. A layer of semi-conductive crepe paper is stacked on the outside of the body coil to form a low-voltage shielding layer. The high and low voltage shieldings work together to reduce the local discharge of the voltage transformer, thereby achieving the purpose of safe operation of the voltage transformer.

[0044] See also Figures 1 to 5 As shown, another embodiment of the present invention provides a method for manufacturing a body coil structure suitable for an automatic pressure gel voltage transformer, comprising the following steps:

[0045] Step S1: Winding the secondary coil 2;

[0046] Step S2: Winding a primary coil 3;

[0047] Step S3: assembling the iron core 1;

[0048] C-type core assembly, the secondary coil 2 and the primary coil 3 are mounted on the core column of the core 1, the heat shrink sleeve 11 is put on, and then the C-type core is fixed with a steel belt;

[0049] Step S4: testing the semi-finished product for error and excitation characteristics; after the test, the exposed C-shaped core cross-section joint 15 is sealed with glue, and the gap between the two side end surfaces of the secondary coil 2 and the core 1 is sealed with mixed silicone rubber 16 and cured naturally;

[0050] Step S5: wrapping the device body and insulating, buffering and shielding the core 1;

[0051] Specifically, the heat shrink sleeve 11 is heated and self-shrinked to adhere to the iron core 1, and the iron core 1 is insulated and buffered by a foamed silicone plate 12. The outside of the foamed silicone plate 12 is sealed with a butt-jointed PVC self-adhesive tape 13, and then a semi-conductive crepe paper II 14 is half-folded for shielding and wrapping to form a low-voltage shielding layer;

[0052] Step S6: device body test;

[0053] After the device body is wrapped, the error, excitation characteristics and voltage resistance tests are carried out.

[0054] In an embodiment of the present invention, in step S1, the process of winding the secondary coil 2 is as follows: the insulating paperboard is wound into a cylindrical shape, capacitor composite paper is sandwiched between the insulating paperboards as a skeleton 6, enameled wire is wound outside the skeleton 6, capacitor composite paper is used for interlayer insulation, and the outermost insulating paperboard and capacitor composite paper are wound as the main insulating layer 5.

[0055] In the embodiment of the present invention, in step S2, the process of winding the primary coil 3 is as follows: a shielding copper foil is added to the outside of the wound secondary coil 2 in the middle, leaving a gap at the head and tail ends, a N-end insulated wire is welded on the shielding copper foil to lead out, a piece of shaped copper foil is led out of the shielding copper foil and welded to the enameled wire of the primary coil 3, a layer of semi-conductive crepe paper is half-stacked on the outside of the shielding copper foil, capacitor composite paper is added to the outside of the semi-conductive crepe paper, and then the enameled wire is wound to form the primary coil 3. Semi-conductive crepe paper I9 is ​​added to the primary coil 3 to form a high-voltage shielding layer 4 of high-voltage shielding. The semi-conductive crepe paper I9 is ​​a whole sheet and folded in half, and the long sides of the semi-conductive crepe paper I9 are pressed with silicone strips 8, and multiple through holes 7 are symmetrically punched on both sides of the end of the semi-conductive crepe paper I9, and the multiple through holes 7 are located at the bottom of the primary coil 3.

[0056] Preferably, the capacitor composite paper is PMP capacitor composite paper.

[0057] In an embodiment of the present invention, in step S3, the process of assembling the iron core 1 is as follows: the iron core 1 is two butt-jointed C-shaped iron cores, and the two C-shaped iron cores are first wrapped with two layers of half-lapped PVC self-adhesive tape 10, and closely attached to the cross-sectional joint 15 of the C-shaped iron core; then a heat shrink sleeve 11 is used to insulate the iron core 1 except for the core column, and the secondary coil 2 and the primary coil 3 are sleeved on the core column of the iron core 1. The two C-shaped iron cores are fixed with a steel belt, and the steel belt is located between the silicone rubber heat shrink sleeve 11 and the half-lapped PVC self-adhesive tape 10.

[0058] In the embodiment of the present invention, in step S5, a hot air gun is used to blow the silicone rubber heat shrink sleeve 11 to shrink and adhere to the outer surface of the iron core 1, and to be tightly combined with the iron core 1 to prevent resin from entering.

[0059] The manufacturing method of the coil structure of the automatic pressure gel voltage transformer provided by the present invention is a new process scheme designed in accordance with the transformer production principle and relevant standards, and fully considers the electromagnetic induction principle. A plurality of circular through holes 7 are symmetrically punched on both sides of the high-voltage shielding layer 4 of the primary coil 3, and the C-shaped core cross-section joint 15 is sealed with glue. The gap between the end face of the secondary coil 2 and the core 1 is sealed with mixed silicone rubber 16 for natural curing, and the core 1 is insulated with a heat shrink sleeve 11. The heat shrink sleeve 11 is tightly combined with the core 1 to avoid the entry of resin, which is conducive to the discharge of pressure injection gas, and the local discharge of the product is small, thereby ensuring the safe operation of the product, and providing favorable guarantees for the batch manufacturing and quality control of voltage transformers.

[0060] The high-voltage shielding layer 4 of the primary coil 3 of the present invention has multiple circular through holes symmetrically formed on both sides, the end face of the secondary coil 2 is sealed with a mixed silicone rubber 16, the heat shrink sleeve 11 is used to insulate the iron core 1, and the C-shaped iron core cross-section joint 15 is sealed with glue. The overall process scheme is easy to operate and simple and easy to implement. The gap between the end face of the secondary coil 2 and the iron core 1 is sealed with a mixed silicone rubber 16 and naturally cured, and the silicone rubber heat shrink sleeve 11 is used to insulate the iron core 1, which is tightly combined with the iron core 1 to avoid resin from entering. The outer foamed silicone plate 12 will not cause the epoxy resin pressure injection gel curing to produce a lot of stress on the iron core 1, so that the performance of the voltage transformer iron core is stable. The primary coil 3 is added with a high-voltage shielding layer 4 formed by folding a whole sheet of semi-conductive crepe paper in half, and multiple circular through holes 7 are symmetrically punched on both sides when the coil is fixed, and the through hole 7 located in the middle is directly opposite to the primary high-voltage lead outlet on the opposite side, which is conducive to the discharge of gas during pressure injection. A layer of semi-conductive crepe paper is stacked outside the coil of the device body to form a low-voltage shielding layer. The high and low voltage shieldings work together to reduce the local discharge of the voltage transformer, thereby achieving the purpose of safe operation of the voltage transformer. The present invention achieves the purpose of preventing the iron core of the voltage transformer from entering the resin and facilitating the discharge of gas during injection.

[0061] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A body coil structure suitable for an automatic pressure gel voltage transformer, comprising an iron core (1) and a secondary coil (2) and a primary coil (3) wound on the iron core (1) from the inside to the outside, characterized in that: A skeleton (6) is provided on the outer side of the core column of the iron core (1), the secondary coil (2) is wound on the skeleton (6), both sides of the secondary coil (2) and the iron core (1) are sealed by a sealant, a main insulating layer (5) is provided between the secondary coil (2) and the primary coil (3), a high-voltage shielding layer (4) is provided on the outer side of the primary coil (3), the high-voltage shielding layer (4) is located on both sides of the inner cavity of the iron core (1) and has a plurality of through holes (7), and the outer side of the iron core (1) is wrapped with an insulating buffer layer and a low-voltage shielding layer; The iron core (1) is two butt-jointed C-shaped iron cores, and the exposed joints (15) of the C-shaped iron core cross sections are bonded by adhesive; The insulating buffer layer comprises a half-lapped PVC self-adhesive tape (10), a heat shrink sleeve (11), a foamed silicone plate (12) and a butt-jointed PVC self-adhesive tape (13) arranged in sequence from the inside to the outside, wherein the half-lapped PVC self-adhesive tape (10) is wrapped around the outside of the C-shaped iron core in at least two layers and is wrapped around the C-shaped iron core cross-section joints (15) at both ends of the C-shaped iron core; the heat shrink sleeve (11) is wrapped around the part of the iron core (1) other than the core column, and the heat shrink sleeve (11) is used for insulation and sealing; the outside of the heat shrink sleeve (11) is wrapped with a foamed silicone plate (12) used for insulation and buffering, and then wrapped with the butt-jointed PVC self-adhesive tape (13) to seal; The low-voltage shielding layer is formed by half-folding and shielding the outer side of the butt-jointed PVC self-adhesive tape (13) using semi-conductive crepe paper II (14); The frame (6) is a cylindrical structure formed by winding insulating paperboard sandwiched with capacitor composite paper; the interlayer insulation of the secondary coil (2) is made of capacitor composite paper; The main insulating layer (5) is an insulating paperboard and a capacitor composite paper arranged from the inside to the outside; The outer side of the main insulating layer (5) is sequentially provided with shielding copper foil, semi-conductive corrugated paper and capacitor composite paper, wherein a gap is left at the head and tail ends of the shielding copper foil, an N-end insulated wire is welded on the shielding copper foil and led out, and a shaped copper foil is led out from one end of the shielding copper foil and welded to the enameled wire of the primary coil (3); The high-voltage shielding layer (4) is made of a whole sheet of semi-conductive corrugated paper I (9) wrapped around the outside of the primary coil (3), with silicone strips (8) pressed on both long sides of the semi-conductive corrugated paper I (9), and a plurality of through holes (7) are symmetrically punched on both sides of the end of the semi-conductive corrugated paper I (9), and the middle through hole (7) is located at the bottom of the primary coil (3).

2. A method for manufacturing a body coil structure suitable for an automatic pressure gel voltage transformer as claimed in claim 1, characterized in that: The following steps are involved: Step S1: Winding the secondary coil (2); Step S2: Winding a coil (3); Step S3: assembling the iron core (1); Step S4: Conduct semi-finished product testing; After the test, the exposed C-shaped core cross-section joint (15) is sealed with glue, and the gap between the two side end surfaces of the secondary coil (2) and the core (1) is sealed with sealant; Step S5: bandaging the body of the device; The iron core (1) is insulated and buffered by using a foamed silicone plate (12), the outside of the foamed silicone plate (12) is sealed tightly by using a butt-jointed PVC self-adhesive tape (13), and then half-folded semi-conductive crepe paper II (14) is used for shielding and wrapping to form a low-voltage shielding layer; Step S6: device body test; After the device body is wrapped, the error, excitation characteristics and withstand voltage tests are carried out; The process of winding the primary coil (3) is as follows: a shielding copper foil is added to the outside of the wound secondary coil (2) in the middle, leaving a gap at the head and tail ends, a primary N-end insulated wire is welded to the shielding copper foil to lead out, a shaped copper foil is led out of the shielding copper foil and welded to the enameled wire of the primary coil (3), a layer of semi-conductive crepe paper is half-lapped on the outside of the shielding copper foil, capacitor composite paper is added to the outside of the semi-conductive crepe paper, and then the enameled wire is wound to form the primary coil (3); A whole sheet of semi-conductive corrugated paper I (9) is applied to the primary coil (3), silicone strips (8) are pressed on both long sides of the semi-conductive corrugated paper I (9), and a plurality of through holes (7) are symmetrically punched on both sides of the end of the semi-conductive corrugated paper I (9), and the plurality of through holes (7) are located at the bottom of the primary coil (3); The process of assembling the iron core (1) is as follows: the iron core (1) is two butt-jointed C-shaped iron cores, the two C-shaped iron cores are firstly wrapped with a half-lapped PVC self-adhesive tape (10), and then a heat shrink sleeve (11) is sleeved thereon, the secondary coil (2) and the primary coil (3) are sleeved on the core column of the iron core (1), and the two C-shaped iron cores are fixed with a steel belt, which is located between the heat shrink sleeve (11) and the half-lapped PVC self-adhesive tape (10).

3. The method for manufacturing a body coil structure suitable for an automatic pressure gel voltage transformer according to claim 2, characterized in that: The process of winding the secondary coil (2) is as follows: insulating paperboard sandwiched with capacitor composite paper is wound into a cylinder as a frame (6), enameled wire is wound outside the frame (6), capacitor composite paper is used for interlayer insulation, and insulating paperboard and capacitor composite paper are wound on the outermost side of the enameled wire to form a main insulating layer (5).

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