CN111292953A - Manufacturing process of burst short circuit resistant amorphous alloy transformer coil - Google Patents

Manufacturing process of burst short circuit resistant amorphous alloy transformer coil Download PDF

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Publication number
CN111292953A
CN111292953A CN202010177558.2A CN202010177558A CN111292953A CN 111292953 A CN111292953 A CN 111292953A CN 202010177558 A CN202010177558 A CN 202010177558A CN 111292953 A CN111292953 A CN 111292953A
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coil
winding
oil duct
amorphous alloy
short circuit
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Inventor
王红刚
王小辉
马清丽
王森
张红全
寇书瑜
郭怀川
王祥令
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Henan Tailong Power Equipment Co ltd
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Henan Tailong Power Equipment Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/061—Winding flat conductive wires or sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/094—Tensioning or braking devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/122—Insulating between turns or between winding layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil

Abstract

The invention discloses a manufacturing process of an anti-burst short circuit amorphous alloy transformer coil, which comprises the following steps: step 1, winding a low-voltage coil; step 2, placing main insulation; step 3, winding the high-voltage coil; step 4, brushing glue; step 5, shaping; step 6, curing; and 7, removing the mold. The invention can effectively solve the problem of insufficient sudden short circuit resistance of the amorphous alloy transformer.

Description

Manufacturing process of burst short circuit resistant amorphous alloy transformer coil
Technical Field
The invention relates to the technical field of oil-immersed amorphous alloy transformers, in particular to a manufacturing process of an anti-burst short circuit amorphous alloy transformer coil.
Background
The amorphous alloy transformer becomes an energy-saving environment-friendly product due to the ultralow no-load loss and is widely applied. However, the coil has a rectangular structure because the core has a generally rectangular cross section due to the difficult cutting characteristics of the amorphous alloy. The rectangular coil is far less uniform in electric force than a common transformer circular winding, and is easier to deform when bearing sudden short circuit electric force. In addition, the straight line parts of the four sides in the rectangular coil winding are easy to bulge and expand, the winding is not tight, the coil is often damaged due to electric power instability caused by external short circuit in operation, and turn-to-turn short circuit of the coil can be caused in serious conditions to burn out the transformer. In combination with analysis of transformer accident causes published by national grid companies in recent years, short-circuit resistance is insufficient and becomes an important cause of accidents of amorphous alloy transformers, so that improvement of a coil manufacturing process is needed, mechanical strength of a rectangular coil is enhanced, and sudden short-circuit resistance of the amorphous alloy transformer is enhanced.
Disclosure of Invention
The invention aims to solve the existing problems and provides a manufacturing process of an anti-burst short circuit amorphous alloy transformer coil, which can effectively solve or at least reduce the problem of insufficient anti-burst short circuit capability of an amorphous alloy transformer.
The invention is realized by the following technical scheme:
a manufacturing process of an anti-burst short circuit amorphous alloy transformer coil comprises the following steps:
step 1, winding a low-voltage coil;
step 2, main insulation placement: the main insulation adopts a three-layer structure of large gummed paper, an oil duct and the large gummed paper;
step 3, winding the high-voltage coil;
step 4, brushing glue: and (3) brushing resin glue on two end faces of the high-voltage coil in the step (3) and the low-voltage coil in the step (1), aligning each oil duct of the high-voltage coil and each oil duct of the low-voltage coil by using dry gas through a high-pressure air gun, and blowing off redundant glue.
Step 5, shaping: placing the high-voltage coil and the low-voltage coil in the step 4 in the middle of a press-mounting die, adding a limiting device, and pressing to a required size by using a press machine;
step 6, curing: heating to 90 + -5 deg.C for 3 hr, and heating to 125 + -5 deg.C for 6 hr;
step 7, removing the mold: naturally cooling to room temperature and then removing the mold.
Preferably, step 1 comprises the steps of:
a. mounting the framework, and penetrating the framework into a winding mold;
b. the first copper bar is arranged opposite to the first corresponding coil and is cushioned by a stepped oil duct, so that the long axis side of the coil is slightly provided with a cambered surface;
c. winding, namely pressing the front pressing roller, adjusting the insulating tension of the copper foil and the layers, winding at the speed of less than 30rpm, and knocking and flattening each layer by using a knock-out plate;
d. placing an oil duct, wherein the oil duct is placed along the center of the short shaft, and warps of each layer of oil duct are aligned and widened according to the radial direction, so that the oil ducts are uniformly and regularly distributed in a sector shape;
e. and (4) treating the tail end, wherein the tail end copper bar position is opposite to the coil corresponding to the tail end, and the tail end copper bar position is padded up by using a step oil duct, so that the long axis side of the coil is slightly provided with an arc surface.
Preferably, step 3 comprises the steps of:
f. winding, adjusting the tension of the wire tensioning device, controlling the rotating speed of the winding machine, adjusting the pressure of the positive pressure roller, and pressing the positive pressure roller;
g. placing end insulation, wherein the end insulation adopts high-density paperboard and pre-baking is carried out; the interfaces are distributed on the straight line part of the long shaft and are coated by TUX-FLEX high-strength point adhesive paper;
h. placing an oil duct, wherein the oil duct is placed along the center of the short shaft, and the warps are aligned; the width is adjusted, so that the coil ensures that the fan-shaped arc is stably transited;
i. and (3) performing appearance treatment, namely winding the coil by using a high-density tightening belt and a reticular semi-dry weftless glass fiber adhesive tape, half-laminating the coil by using the high-density tightening belt and the reticular semi-dry weftless glass fiber adhesive tape, and winding the coil to pre-soak the DMD for firm fixation after adding the grid cloth on the short shaft side.
Preferably, the thickness of the skeleton is 3-8 mm.
Preferably, in the step of winding the low-voltage coil, the tension of the copper foil is adjusted to be 1.6-1.8 kg/cm2The insulating tension of the adjusting layer is 1.8-2.0kg/cm2The tension of the front press roll is 1.9-2.2kg/cm2。
Preferably, in the high-voltage coil winding step, the pressure of the positive pressure roller is adjusted to be 2.4-3.0kg/cm2And controlling the rotating speed of the winding machine to be not more than 180 rpm.
Preferably, the end insulation is 1.5-2mm high density cardboard.
The invention has the beneficial effects that: the manufacturing process of the anti-short-protrusion amorphous alloy transformer coil comprises the steps that a low-voltage coil adopts a hard framework, a conductor adopts copper foil, interlayer insulation adopts high-strength all-adhesive paper, each layer is knocked to be flat by a knock-out plate during winding, no empty drum is left, the copper foil and the all-adhesive paper are tightly wound on the hard framework, the head and the tail of two sides of a short shaft of the low-voltage coil and the opposite surface of the short shaft of the low-voltage coil are padded up by a step oil duct, the coil and an iron core are ensured to be coaxial, and a uniform and regularly-sector-distributed gridding cloth oil duct is added, so that the side of the long shaft of the coil is provided with a cambered surface; controlling the tension and the rotating speed of the low-voltage copper foil and the high-voltage enameled wire and using a positive pressure roller to ensure that the coil is compact and flat in the radial direction and the axial direction and is regular in wire arrangement without a cavity; the full adhesive paper between the low-voltage coil layers and the large adhesive paper between the high-voltage coil layers have super-strong adhesion after being heated, and the coil is changed into a similar steel body after being wrapped by a tightening belt, a weftless belt and a presoaked DMD on the outer surface of the high-voltage coil and then subjected to glue brushing, shaping, hot drying and curing treatment on the end part of the coil, so that the short-circuit resistance of the coil is greatly enhanced.
Drawings
FIG. 1 is a production process diagram of an amorphous alloy transformer coil according to the present invention;
FIG. 2 is a schematic diagram of a coil structure;
wherein: first copper bar 1, tail copper bar 2, first copper bar department ladder oil duct 3, first copper bar opposite ladder oil duct 4, tail copper bar department ladder oil duct 5, tail copper bar opposite ladder oil duct 6, fan-shaped distribution oil duct 7.
Detailed Description
In the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the term "mounted" is to be understood broadly, for example, as being fixedly attached, detachably attached, or integrally attached; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1, the manufacturing process of the burst short circuit resistant amorphous alloy transformer coil comprises the following steps:
step 1, winding a low-voltage coil:
a. and (3) mounting the framework, namely penetrating the framework with the thickness of 3mm into a winding mold, centering and fixing the framework with the foil and the interlayer insulation, and coating a layer of full-adhesive paper on the framework. The framework is a hard epoxy glass cloth cylinder. The interlayer insulation is full adhesive paper. The full-adhesive paper can meet the interlayer insulating strength of the low-voltage coil, guarantees the compactness and the external force resistance of the low-voltage coil, and can ensure the structural integrity of the coil after being heated and cured due to the characteristic of super-strong adhesive force.
b. The first is dealt with, and first copper bar 1 department fills up into excessive circular arc with the ladder oil duct, does not leave the cavity, forms first copper bar department ladder oil duct 3. The head corresponds to the opposite side of the coil and is padded up by the step oil duct, so that the long axis side of the coil is slightly provided with a structure of an arc surface to form the head copper bar opposite step oil duct 4, and the stress performance of the coil is improved. The height of the step oil passage is reduced from the middle to the height of the oil passages at two sides in sequence to form an arc.
c. Winding, adjusting the tension of copper foil to 1.6 kg/cm2The layer insulation tension is 1.8kg/cm2The tension of the front press roll is 1.9kg/cm2. And pressing the front pressing roller, winding at the speed of less than 30rpm, and flattening each layer by using a striking plate without leaving empty drum. And (4) adding adhesive paper at four corners of the coil, wherein the adhesive paper is 0.13 × 50 × h (h is the height of the coil), and reinforcing the insulation.
d. Oil ducts are placed every 3 layers. The oil duct adopts 3mm of net cloth for warp. The warp of every layer of oil duct aligns to separate 3 layers and increase 2 warps, make its even and regular fan-shaped distribution, form fan-shaped distribution oil duct 7, guarantee the good radian of coil major axis direction, make the coil atress even, the radiating effect is good.
e. The tail is handled, and 3 both sides of tail copper bar correspond the coil opposite with the tail, fill up with the ladder oil duct, form tail copper bar department ladder oil duct 5 and the opposite ladder oil duct 6 of tail copper bar, make the coil long axis side slightly take the cambered surface, promote the atress performance of coil. And the high-low voltage coil and the iron core are kept coaxial. The height of the step oil passage is reduced from the middle to the height of the oil passages at two sides in sequence to form an arc.
And 2, main insulation, wherein the main insulation adopts a three-layer structure of large gummed paper, an oil duct and the large gummed paper, and is bonded with the high-low voltage coil after being subjected to heat drying and curing treatment, so that the structural integrity of the coil is ensured, and the heat dissipation of the inner surface and the outer surface of the high-low voltage coil is ensured. The oil duct adopts 3mm of net cloth for warp. Two warps are additionally padded at the four corners respectively to ensure the main insulation distance.
Step 3, winding the high-voltage coil:
f. winding, adjusting the tension of the wire tensioning device to ensure that the change rate of the wire gauge is not more than 0.02mm, and adjustingThe pressure of the positive pressure roller was 2.4kg/cm2Pressing the positive pressure roller, controlling the rotation speed of the winding machine to be not more than 180rpm, ensuring that the coil is compact and flat in the radial direction and the axial direction, arranging the wire regularly and leaving no cavity
g. The end insulation is placed, the end insulation adopts a high-density paperboard with the thickness of 1.5mm, and pre-drying is carried out, so that the coil looseness caused by the shrinkage of an insulation part during later drying is reduced; the connectors are distributed on the straight line part of the long shaft and are coated by TUX-FLEX high-strength point adhesive paper to prevent debris from entering.
h. Oil ducts are arranged, and the oil ducts are arranged at intervals of 2 layers. The oil duct adopts 3mm of mesh cloth of warp, place symmetrically along minor axis center, the warp aligns; and 2 warps are added at intervals of 2-3 layers, so that the warps are uniformly and regularly distributed in a fan shape to form a fan-shaped distribution oil passage, and the good radian of the long axis direction of the coil is ensured, so that the stress of the coil is uniform.
i. The outer surface of the coil is treated, the high-density tightening belt and the reticular semi-dry weftless glass fiber adhesive belt are respectively wound in a half-lap mode by one layer, 3mm mesh cloth oil passages are additionally arranged on the short shaft side, and then the DMD pre-soaked by 0.2mm is used for winding 6 layers and firmly adhering, so that the mechanical strength of the outer layer of the coil is guaranteed, and the coil can bear the external expansion force during short circuit and is not deformed.
And step 4, brushing glue, brushing resin glue on the upper end surface and the lower end surface of the coil, and adjusting the viscosity of the glue solution to be No. 4, wherein the viscosity is measured for 11-14 s. The brushing glue is uniform. The brush glue can enhance the mechanical strength of the end insulation, and can enable the end insulation and the lead to be fixedly combined into a whole, so that the sufficient mechanical strength of the coil is ensured. And (3) blowing off redundant glue by using dry gas through each oil duct of the high-voltage coil and the low-voltage coil through a high-pressure air gun, so as to ensure the smoothness of the oil ducts.
And 5, shaping, namely selecting a smooth press-fitting die with enough strength, placing the coil with the die in the middle of the press-fitting die, and placing 2 limiting steel pipes at the front end and the rear end of the coil respectively to avoid deformation and damage caused by excessive pressing of the coil.
And 6, solidifying, namely inserting a Pt100 probe into the coil to test the temperature of the coil, heating to 90 ℃ and keeping for 3 hours, and then heating to 125 ℃ and keeping for 6 hours to enable the lead, the interlayer insulation, the end insulation and the insulating cylinder to be solidified together.
And 7, removing the mold, opening the oven door, naturally cooling to room temperature, removing the mold, and finishing to obtain the coil.
The amorphous alloy transformer coil obtained through the procedures is changed into a similar steel body, and the sudden short circuit resistance of the coil is greatly enhanced.
Example 2:
as shown in fig. 1, the manufacturing process of the burst short circuit resistant amorphous alloy transformer coil comprises the following steps:
step 1, winding a low-voltage coil:
a. and (3) mounting the framework, namely penetrating the framework with the thickness of 8mm into a winding mold, centering and fixing the framework with the foil and the interlayer insulation, and wrapping a layer of full-adhesive paper on the framework. The framework is a hard epoxy glass cloth cylinder. The interlayer insulation is full adhesive paper. The full-adhesive paper can meet the interlayer insulating strength of the low-voltage coil, guarantees the compactness and the external force resistance of the low-voltage coil, and can ensure the structural integrity of the coil after being heated and cured due to the characteristic of super-strong adhesive force.
b. The first copper bar is arranged, and the first copper bar is padded into a transition arc by a stepped oil duct without a cavity. The head is opposite to the coil and is padded up by a step oil duct, so that the long axis side of the coil is slightly provided with a cambered surface structure, and the stress performance of the coil is improved. The height of the step oil passage is reduced from the middle to the height of the oil passages at two sides in sequence to form an arc.
c. Winding, adjusting copper foil tension to 1.8kg/cm2The layer insulation tension is 2.0kg/cm2The tension of the front press roll is 2.2kg/cm2. And pressing the front pressing roller, winding at the speed of less than 30rpm, and flattening each layer by using a striking plate without leaving empty drum. And (4) adding adhesive paper at four corners of the coil, wherein the adhesive paper is 0.13 × 50 × h (h is the height of the coil), and reinforcing the insulation.
d. Oil ducts are placed every 3 layers. The oil duct adopts 3mm of net cloth for warp. The warp of every layer of oil duct aligns to separate 3 layers and increase 2 warps, make its even and regular fan-shaped distribution, guarantee the good radian of coil major axis direction, make the coil atress even, the radiating effect is good.
e. And (4) tail disposal, wherein two sides of a tail copper bar are opposite to the coil corresponding to the tail, and the tail copper bar is padded up by a step oil duct, so that the long axis side of the coil is slightly provided with an arc surface, and the stress performance of the coil is improved. And the high-low voltage coil and the iron core are kept coaxial. The height of the step oil passage is reduced from the middle to the height of the oil passages at two sides in sequence to form an arc.
And 2, main insulation, wherein the main insulation adopts large gummed paper, an oil duct and large gummed paper, and is bonded with the high-low voltage coil after being subjected to heat drying and curing treatment, so that the structural integrity of the coil is ensured, and the heat dissipation of the inner surface and the outer surface of the high-low voltage coil is ensured. The oil duct adopts 3mm of net cloth for warp. Two warps are additionally padded at the four corners respectively to ensure the main insulation distance.
Step 3, winding the high-voltage coil:
f. winding, adjusting tension of the wire tensioning device to ensure that the change rate of a wire gauge is not more than 0.02mm, and adjusting the pressure of a positive pressure roller to be 3.0kg/cm2Pressing the positive pressure roller, controlling the rotation speed of the winding machine to be not more than 180rpm, ensuring that the coil is compact and flat in the radial direction and the axial direction, arranging the wire regularly and leaving no cavity
g. The end insulation is placed, the end insulation adopts 2mm high-density paper boards, and pre-drying is carried out, so that the coil looseness caused by shrinkage of an insulation part during later drying is reduced; the connectors are distributed on the straight line part of the long shaft and are coated by TUX-FLEX high-strength point adhesive paper to prevent debris from entering.
h. Oil ducts are arranged, and the oil ducts are arranged at intervals of 2 layers. The oil duct adopts 3mm of mesh cloth of warp, place symmetrically along minor axis center, the warp aligns; and 2 warps are added at intervals of 2-3 layers, so that the warps are uniformly and regularly distributed in a fan shape, and the good radian of the long axis direction of the coil is ensured, so that the stress of the coil is uniform.
i. The outer surface of the coil is treated, the high-density tightening belt and the reticular semi-dry weftless glass fiber adhesive belt are respectively wound in a half-lap mode by one layer, 3mm mesh cloth oil passages are additionally arranged on the short shaft side, and then the DMD pre-soaked by 0.2mm is used for winding 6 layers and firmly adhering, so that the mechanical strength of the outer layer of the coil is guaranteed, and the coil can bear the external expansion force during short circuit and is not deformed.
And step 4, brushing glue, brushing resin glue on the upper end surface and the lower end surface of the coil, and adjusting the viscosity of the glue solution to be No. 4, wherein the viscosity is measured for 11-14 s. The brushing glue is uniform. The brush glue can enhance the mechanical strength of the end insulation, and can enable the end insulation and the lead to be fixedly combined into a whole, so that the sufficient mechanical strength of the coil is ensured. And (3) blowing off redundant glue to each oil duct of the coil by using dry gas through a high-pressure air gun, so as to ensure the smoothness of the oil duct.
And 5, shaping, namely selecting a smooth press-fitting die with enough strength, placing the coil with the die in the middle of the press-fitting die, and placing 2 limiting steel pipes at the front end and the rear end of the coil respectively to avoid deformation and damage caused by excessive pressing of the coil.
And 6, solidifying, namely inserting a Pt100 probe into the coil to test the temperature of the coil, heating to 95 ℃ and keeping for 3 hours, and heating to 130 ℃ and keeping for 6 hours to enable the lead, the interlayer insulation, the end insulation and the insulating cylinder to be solidified together.
And 7, removing the mold, opening the oven door, naturally cooling to room temperature, removing the mold, and finishing to obtain the coil.
Example 3:
as shown in fig. 1, the manufacturing process of the burst short circuit resistant amorphous alloy transformer coil comprises the following steps:
step 1, winding a low-voltage coil:
a. and (3) mounting the framework, namely penetrating the framework with the thickness of 6mm into a winding mold, centering and fixing the framework with the foil and the interlayer insulation, and coating a layer of full-adhesive paper on the framework. The framework is a hard epoxy glass cloth cylinder. The interlayer insulation is full adhesive paper. The full-adhesive paper can meet the interlayer insulating strength of the low-voltage coil, guarantees the compactness and the external force resistance of the low-voltage coil, and can ensure the structural integrity of the coil after being heated and cured due to the characteristic of super-strong adhesive force.
b. The first copper bar is arranged, and the first copper bar is padded into a transition arc by a stepped oil duct without a cavity. The head is opposite to the coil and is padded up by a step oil duct, so that the long axis side of the coil is slightly provided with a cambered surface structure, and the stress performance of the coil is improved. The height of the step oil passage is reduced from the middle to the height of the oil passages at two sides in sequence to form an arc.
c. Winding, adjusting copper foil tension to 1.7 kg/cm2The layer insulation tension is 1.9kg/cm2The tension of the front press roll is 2.0kg/cm2. And pressing the front pressing roller, winding at the speed of less than 30rpm, and flattening each layer by using a striking plate without leaving empty drum. And (4) adding adhesive paper at four corners of the coil, wherein the adhesive paper is 0.13 × 50 × h (h is the height of the coil), and reinforcing the insulation.
d. Oil ducts are placed every 3 layers. The oil duct adopts 3mm of net cloth for warp. The warp of every layer of oil duct aligns to separate 3 layers and increase 2 warps, make its even and regular fan-shaped distribution, guarantee the good radian of coil major axis direction, make the coil atress even, the radiating effect is good.
e. And (4) tail disposal, wherein two sides of a tail copper bar are opposite to the coil corresponding to the tail, and the tail copper bar is padded up by a step oil duct, so that the long axis side of the coil is slightly provided with an arc surface, and the stress performance of the coil is improved. And the high-low voltage coil and the iron core are kept coaxial. The height of the step oil passage is reduced from the middle to the height of the oil passages at two sides in sequence to form an arc.
And 2, main insulation, wherein the main insulation adopts large gummed paper, an oil duct and large gummed paper, and is bonded with the high-low voltage coil after being subjected to heat drying and curing treatment, so that the structural integrity of the coil is ensured, and the heat dissipation of the inner surface and the outer surface of the high-low voltage coil is ensured. The oil duct adopts 3mm of net cloth for warp. Two warps are additionally padded at the four corners respectively to ensure the main insulation distance.
Step 3, winding the high-voltage coil:
f. winding, adjusting tension of the wire tensioning device to ensure that the change rate of a wire gauge is not more than 0.02mm, and adjusting the pressure of a positive pressure roller to be 2.7kg/cm2Pressing the positive pressure roller, controlling the rotation speed of the winding machine to be not more than 180rpm, ensuring that the coil is compact and flat in the radial direction and the axial direction, arranging the wire regularly and leaving no cavity
g. The end insulation is placed, the end insulation adopts a high-density paperboard with the thickness of 1.8mm, and pre-drying is carried out, so that the coil looseness caused by the shrinkage of an insulation part during later drying is reduced; the connectors are distributed on the straight line part of the long shaft and are coated by TUX-FLEX high-strength point adhesive paper to prevent debris from entering.
h. Oil ducts are arranged, and the oil ducts are arranged at intervals of 2 layers. The oil duct adopts 3mm of mesh cloth of warp, place symmetrically along minor axis center, the warp aligns; and 2 warps are added at intervals of 2-3 layers, so that the warps are uniformly and regularly distributed in a fan shape, and the good radian of the long axis direction of the coil is ensured, so that the stress of the coil is uniform.
i. The outer surface of the coil is treated, the high-density tightening belt and the reticular semi-dry weftless glass fiber adhesive belt are respectively wound in a half-lap mode by one layer, 3mm mesh cloth oil passages are additionally arranged on the short shaft side, and then the DMD pre-soaked by 0.2mm is used for winding 6 layers and firmly adhering, so that the mechanical strength of the outer layer of the coil is guaranteed, and the coil can bear the external expansion force during short circuit and is not deformed.
And step 4, brushing glue, brushing resin glue on the upper end surface and the lower end surface of the coil, and adjusting the viscosity of the glue solution to be No. 4, wherein the viscosity is measured for 11-14 s. The brushing glue is uniform. The brush glue can enhance the mechanical strength of the end insulation, and can enable the end insulation and the lead to be fixedly combined into a whole, so that the sufficient mechanical strength of the coil is ensured. And (3) blowing off redundant glue to each oil duct of the coil by using dry gas through a high-pressure air gun, so as to ensure the smoothness of the oil duct.
And 5, shaping, namely selecting a smooth press-fitting die with enough strength, placing the coil with the die in the middle of the press-fitting die, and placing 2 limiting steel pipes at the front end and the rear end of the coil respectively to avoid deformation and damage caused by excessive pressing of the coil.
And 6, solidifying, namely inserting a Pt100 probe into the coil to test the temperature of the coil, heating to 93 ℃ and keeping for 3 hours, and then heating to 128 ℃ and keeping for 6 hours to enable the lead, the interlayer insulation, the end insulation and the insulating cylinder to be solidified together.
And 7, removing the mold, opening the oven door, naturally cooling to room temperature, removing the mold, and finishing to obtain the coil.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (7)

1. A manufacturing process of an anti-burst short circuit amorphous alloy transformer coil is characterized by comprising the following steps:
step 1, winding a low-voltage coil;
step 2, main insulation placement: the main insulation adopts a three-layer structure of large gummed paper, an oil duct and the large gummed paper;
step 3, winding the high-voltage coil;
step 4, brushing glue: brushing resin glue on two end faces of the high-voltage coil in the step 3 and the low-voltage coil in the step 1, aligning each oil duct of the high-voltage coil and each oil duct of the low-voltage coil by using dry gas through a high-pressure air gun, and blowing off redundant glue;
step 5, shaping: placing the high-voltage coil and the low-voltage coil in the step 4 in the middle of a press-mounting die, adding a limiting device, and pressing to a required size by using a press machine;
step 6, curing: heating to 90 + -5 deg.C for 3 hr, and heating to 125 + -5 deg.C for 6 hr;
step 7, removing the mold: naturally cooling to room temperature and then removing the mold.
2. The manufacturing process of the burst short circuit resistant amorphous alloy transformer coil as claimed in claim 1, wherein the step 1 comprises the following steps:
a. mounting the framework, and penetrating the framework into a winding mold;
b. the first copper bar is arranged opposite to the first corresponding coil and is cushioned by a stepped oil duct, so that the long axis side of the coil is slightly provided with a cambered surface;
c. winding, namely pressing the front pressing roller, adjusting the insulating tension of the copper foil and the layers, winding at the speed of less than 30rpm, and knocking and flattening each layer by using a knock-out plate;
d. placing an oil duct, wherein the oil duct is placed along the center of the short shaft, and warps of each layer of oil duct are aligned and widened according to the radial direction, so that the oil ducts are uniformly and regularly distributed in a sector shape;
e. and (4) treating the tail end, wherein the tail end copper bar position is opposite to the coil corresponding to the tail end, and the tail end copper bar position is padded up by using a step oil duct, so that the long axis side of the coil is slightly provided with an arc surface.
3. The manufacturing process of the burst short circuit resistant amorphous alloy transformer coil as claimed in claim 1, wherein the step 3 comprises the following steps:
f. winding, adjusting the tension of the wire tensioning device, controlling the rotating speed of the winding machine, adjusting the pressure of the positive pressure roller, and pressing the positive pressure roller;
g. placing end insulation, wherein the end insulation adopts high-density paperboard and pre-baking is carried out; the interfaces are distributed on the straight line part of the long shaft and are coated by TUX-FLEX high-strength point adhesive paper;
h. placing an oil duct, wherein the oil duct is placed along the center of the short shaft, and the warps are aligned; the width is adjusted, so that the coil ensures that the fan-shaped arc is stably transited;
i. and (3) performing appearance treatment, namely winding the coil by using a high-density tightening belt and a reticular semi-dry weftless glass fiber adhesive tape, half-laminating the coil by using the high-density tightening belt and the reticular semi-dry weftless glass fiber adhesive tape, and winding the coil to pre-soak the DMD for firm fixation after adding the grid cloth on the short shaft side.
4. The manufacturing process of the burst short circuit resistant amorphous alloy transformer coil according to claim 1, characterized in that: the thickness of the framework is 3-8 mm.
5. The manufacturing process of the burst short circuit resistant amorphous alloy transformer coil according to claim 1, characterized in that: in the step of winding the low-voltage coil, the tension of the copper foil is adjusted to be 1.6-1.8 kg/cm2The insulating tension of the adjusting layer is 1.8-2.0kg/cm2The tension of the front press roll is 1.9-2.2kg/cm2。
6. The manufacturing process of the burst short circuit resistant amorphous alloy transformer coil according to claim 1, characterized in that: in the high-voltage coil winding step, the pressure of the positive pressure roller is adjusted to be 2.4-3.0kg/cm2And controlling the rotating speed of the winding machine to be not more than 180 rpm.
7. The manufacturing process of the burst short circuit resistant amorphous alloy transformer coil according to claim 1, characterized in that: the end insulation adopts 1.5-2mm high-density paperboard.
CN202010177558.2A 2020-03-13 2020-03-13 Manufacturing process of burst short circuit resistant amorphous alloy transformer coil Pending CN111292953A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112582172A (en) * 2020-12-17 2021-03-30 安徽沃华电力设备有限公司 Composite insulating cylinder, current limiter and processing technology thereof

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Publication number Priority date Publication date Assignee Title
CN202120729U (en) * 2011-06-24 2012-01-18 武汉振源电力设备有限公司 Amorphous alloy transformer structure
CN206363867U (en) * 2017-01-20 2017-07-28 青岛特锐德电气股份有限公司 Meet the transformer of the anti-accident short circuit of IEC standard
CN110060847A (en) * 2019-04-03 2019-07-26 许昌泰克电气有限公司 A kind of anti-sudden short circuit amorphous alloy oil immersion type full-enclosed distribution transformer
CN209471817U (en) * 2018-12-21 2019-10-08 青岛特锐德电气股份有限公司 A kind of inexpensive resistance to shorting loop construction of transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202120729U (en) * 2011-06-24 2012-01-18 武汉振源电力设备有限公司 Amorphous alloy transformer structure
CN206363867U (en) * 2017-01-20 2017-07-28 青岛特锐德电气股份有限公司 Meet the transformer of the anti-accident short circuit of IEC standard
CN209471817U (en) * 2018-12-21 2019-10-08 青岛特锐德电气股份有限公司 A kind of inexpensive resistance to shorting loop construction of transformer
CN110060847A (en) * 2019-04-03 2019-07-26 许昌泰克电气有限公司 A kind of anti-sudden short circuit amorphous alloy oil immersion type full-enclosed distribution transformer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112582172A (en) * 2020-12-17 2021-03-30 安徽沃华电力设备有限公司 Composite insulating cylinder, current limiter and processing technology thereof
CN112582172B (en) * 2020-12-17 2022-09-27 安徽沃华电力设备有限公司 Composite insulating cylinder, current limiter and processing technology of composite insulating cylinder

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