CN114156083A - Winding positioning method for segmented cylindrical coil of dry-type transformer - Google Patents
Winding positioning method for segmented cylindrical coil of dry-type transformer Download PDFInfo
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- CN114156083A CN114156083A CN202111483198.XA CN202111483198A CN114156083A CN 114156083 A CN114156083 A CN 114156083A CN 202111483198 A CN202111483198 A CN 202111483198A CN 114156083 A CN114156083 A CN 114156083A
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- 238000004804 winding Methods 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 65
- 239000004744 fabric Substances 0.000 claims abstract description 68
- 239000000945 filler Substances 0.000 claims abstract description 26
- 239000010410 layer Substances 0.000 claims description 115
- 239000003365 glass fiber Substances 0.000 claims description 36
- 238000009413 insulation Methods 0.000 claims description 15
- 239000011229 interlayer Substances 0.000 claims description 13
- 230000001174 ascending effect Effects 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 11
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 230000005484 gravity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- H01F41/06—Coil winding
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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
- H01F41/06—Coil winding
- H01F41/082—Devices for guiding or positioning the winding material on the former
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Abstract
The invention provides a winding positioning method of a segmented cylindrical coil of a dry-type transformer, which comprises the following steps: firstly fixing a positioning net on a die, then drawing lines on the positioning net according to the starting positions of all sections of coils, embedding a plurality of fixing bands in the circumferential direction of each section of line-drawing positioning net, binding the first and last turns of wires of each layer of each section of coil by using the embedded fixing bands, and binding the whole section of coil by using a splayed binding band after the winding of each section of coil is finished. Finally, filling materials are taken from the coil sections to fill the space between the coil sections axially for fixing. The winding positioning method can ensure that the first turn lead and the last turn lead of each section do not slide down or fall off, the distance between coil sections is ensured to be good, the running safety of the transformer is high, the operation of workers is time-saving and labor-saving, and the cost is reduced; the mesh cloth is used as the filler among the coils of each section, and the mesh cloth is easier to be poured through during pouring, so that the reliable quality of the product can be ensured.
Description
Technical Field
The invention relates to the technical field of dry-type transformers, in particular to a winding positioning method of a segmented cylindrical coil of a dry-type transformer.
Background
The known dry-type transformer sectional cylindrical coil needs to ensure the insulating distance between sections and prevent short circuit between sections caused by overlarge potential difference. However, in the process of setting up the coil, the phenomenon that the lead is easily loosened and slides down due to the influence of gravity causes insufficient insulation distance between sections, so that short circuit accidents between sections are caused, particularly for transformers used in wind power projects, the wind power projects have high requirements on coil quality, and the coil has high voltage level, heavier weight, more sections and larger influence due to gravity.
In the prior art, aiming at the problems that the coil is divided into 8 sections and above, the coil of a dry type transformer with the voltage level of 35kV is heavy and is divided into more sections, the first turn and the last turn of each layer of the lead wire are fixed by glass fiber cloth tapes independently at four points in the circumferential direction, the first turn and the last turn of each layer of the lead wire are fixed by the glass fiber cloth tapes, the first turn and the second turn of each layer of the coil are fixed by the glass fiber cloth tapes, when each layer of the coil is wound to a distance of 5-6 turns from the tail end, the other glass fiber cloth tape is taken to fix the last turn of the lead wire, and meanwhile, 6-8 prefabricated clean cured resin blocks are placed between the sections to stabilize the support and the positioning of the coil sections, so that the lead wire cannot be loosened when the coil is lifted. According to the method, the first turn and the last turn of the lead of each layer of coil are independently fixed, the lead is not communicated, the phenomenon that a coil cake slides down is easily caused in the process of standing the coil, meanwhile, workers at the positions between sections need to actually match the solidified resin blocks according to the distance between the sections of the coil, the operation is complex, the cost is high, the solidified resin blocks can move and dislocate, the guarantee effect of the distance between the sections is poor, the resin blocks exist inside the coil, the coil is not easy to be completely poured during pouring, air holes possibly exist after pouring, and the potential quality hazard of insulation breakdown exists.
Disclosure of Invention
In view of the above, the present invention provides a winding positioning method for a segmented cylindrical coil of a dry-type transformer, which can ensure that the distance between coil segments is good, the coil segments are firmly fixed, and the transformer has high operation safety.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a winding positioning method for a segmented cylindrical coil of a dry-type transformer, where the winding positioning method includes:
s1: winding and fixing a positioning net on a mould for winding a coil, uniformly dividing the positioning net into 6-8 equal parts in the circumferential direction and marking, and marking the starting position of each segment of the coil in the axial direction of the marking position;
s2: according to the starting position of each section of coil marked in S1, embedding a fixing band between the positioning net and the mould in each section, wherein two ends of the fixing band respectively extend out of the starting positions of the two adjacent sections of coils;
s3: winding a first layer of coil from the starting position of the first section of coil, fixing a first turn of lead of the first layer of coil by using the part of the fixing band extending out of the starting position and pressing the fixing band to the lower part of the lead when the first layer of coil is wound to the position of 6-8 equal parts, and fixing a last turn of lead by using the fixing band for fixing the first turn of lead when the coil is continuously wound to the position of the last turn of lead according to the turn requirement of each layer of drawing; when the first layer of coil is wound to perform ascending winding, firstly placing interlayer insulation and then winding, fixing the first layer of coil by the same method as the first layer of coil until the first section of coil is wound, and then taking another fixing belt to perform full-wrapping winding on the first section of coil and then binding and fixing the first section of coil in a splayed manner;
s4: winding the rest sections of coils by the same winding method as the first section of coils;
s5: and filling filler between every two sections of coils, and fixing the filler by using a fixing band.
Further, the positioning net was evenly divided into 6 equal parts in the circumferential direction and marked.
Further, in S1, the positioning net includes a mesh cloth, and/or the fixing band in S2 includes a glass fiber cloth band.
Further, the method for embedding the fixing belt in the S2 includes: and taking the fixing band to penetrate into the grids of the positioning net from the starting position, extending the penetrating fixing band along the axial direction, penetrating the fixing band out of the grids of the positioning net from the starting positions of the two adjacent sections of coils, and extending out of two ends of the fixing band and reserving 500-600 mm.
Further, the method for winding the first layer of coil in S3 includes: the method comprises the steps that a first turn lead of a first layer of coil is wound at the starting position of the first section of coil, when the first turn lead is wound at the position of each section of embedded fixing band, the part, extending out from the starting position, of the fixing band is stretched onto the first turn lead and is folded back and tensioned, the fixing band is pressed below the first layer of lead, when the coil is continuously wound to a last turn lead according to the turn requirement of each layer of drawing, the fixing band tensioning the first turn lead is stretched onto the last turn lead and is folded back and tensioned.
Further, the method for winding in the step S3 includes: firstly placing interlayer insulation when each layer of lead is wound in a lifting manner, and respectively marking the positions of the first turn and the last turn of the lifting layer on the interlayer insulation according to the positions of 6-8 equal parts of the circumference of the upper layer; and winding the first turn of the lead of the lifting layer from the first turn position, fixing the first turn of the lead of the lifting layer by using the rest part of the fixing band which is fixed with the last turn of the lead of the upper coil when the lead of the lifting layer is wound to the position of 6-8 equal parts, and fixing the last turn of the lead of the lifting layer by using the rest part of the fixing band which is fixed with the first turn of the lead of the lifting layer when the lead of the lifting layer is continuously wound to the marked last turn position and when the lead of the lifting layer is wound to the position of 6-8 equal parts.
Further, in S3, the method for binding the full-package wound splayed fabric includes: and bending the last turn of the wire of the outermost coil of the first section of coil, winding a plurality of layers of the wire by using another fixing belt along the circumferential direction of the wire, then leading out the wire, carrying out full-wrapping winding on the outermost coil by using the fixing belt, winding 3-5 layers of the outermost coil by using the fixing belt in a full-wrapping manner, and then fixing the first section of coil by adopting a splayed binding manner.
Further, in the S5, the filler includes a mesh cloth.
Further, in S5, 6-8 fillers are arranged between every two sections of coils, the fillers are distributed at equal intervals, and the fillers are axially filled into a straight line.
Further, in S5, between each two segments of coils, a plurality of layers of the filler with different widths are provided according to the distance between the coils of each segment and each layer.
The technical scheme of the invention has the following beneficial effects:
the invention provides a winding positioning method of a segmented cylindrical coil of a dry-type transformer, which comprises the following steps: s1: winding and fixing a positioning net on a mould for winding a coil, uniformly dividing the positioning net into 6-8 equal parts in the circumferential direction and marking, and marking the starting position of each segment of the coil in the axial direction of the marking position; s2: according to the starting position of each section of coil marked in S1, embedding a fixing band between the positioning net and the mould in each section, wherein two ends of the fixing band respectively extend out of the starting positions of the two adjacent sections of coils; s3: winding a first layer of coil from the starting position of the first section of coil, fixing a first turn of lead of the first layer of coil by using the part of the fixing band extending out of the starting position and pressing the fixing band to the lower part of the lead when the first layer of coil is wound to the position of 6-8 equal parts, and fixing a last turn of lead by using the fixing band for fixing the first turn of lead when the coil is continuously wound to the position of the last turn of lead according to the turn requirement of each layer of drawing; when the first layer of coil is wound to perform ascending winding, firstly placing interlayer insulation and then winding, fixing the first layer of coil by the same method as the first layer of coil until the first section of coil is wound, and then taking another fixing belt to perform full-wrapping winding on the first section of coil and then binding and fixing the first section of coil in a splayed manner; s4: winding the rest sections of coils by the same winding method as the first section of coils; s5: and filling filler between every two sections of coils, and fixing the filler by using a fixing band.
(1) The winding method provided by the invention has the advantages that the section spacing is well ensured, the running safety of the transformer is high, the operation of workers is time-saving and labor-saving, and the cost is reduced;
(2) in the invention, the mesh cloth is selected as the filler among the coils of each section, and the mesh cloth is easier to be poured through during pouring, thereby ensuring the product quality.
Drawings
Fig. 1 is a flow chart of the winding positioning of the segmented cylindrical coil of the dry-type transformer.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention in conjunction with the following examples, but it will be understood that the description is intended to illustrate the features and advantages of the invention further, and not to limit the invention.
The winding positioning method provided in the present invention is further explained with reference to fig. 1.
In a first aspect, the present invention provides a method for winding and positioning a segmented cylindrical coil of a dry-type transformer, where the winding method includes:
s1: winding and fixing a positioning net on a mould for winding a coil, uniformly dividing the positioning net into 6-8 equal parts in the circumferential direction and marking, and marking the starting position of each segment of the coil in the axial direction of the marking position;
s2: according to the starting position of each section of coil marked in S1, embedding a fixing band between the positioning net and the mould in each section, wherein two ends of the fixing band respectively extend out of the starting positions of the two adjacent sections of coils;
s3: winding a first layer of coil from the starting position of the first section of coil, fixing a first turn of lead of the first layer of coil by using the part of the fixing band extending out of the starting position and pressing the fixing band to the lower part of the lead when the first layer of coil is wound to the position of 6-8 equal parts, and fixing a last turn of lead by using the fixing band for fixing the first turn of lead when the coil is continuously wound to the position of the last turn of lead according to the turn requirement of each layer of drawing; when the first layer of coil is wound to perform ascending winding, firstly placing interlayer insulation and then winding, fixing the first and last turns of conducting wires by the same method as the first layer of coil until the first section of coil is wound, and then taking another fixing band to perform full-wrapping winding and then binding and fixing the first section of coil in a splayed manner;
s4: winding the rest sections of coils by the same winding method as the first section of coils;
s5: and filling filler between every two sections of coils, and fixing the filler by using a fixing band.
Aiming at the dry type transformer sectional cylindrical coil with 8 sections and above of coil sections and the voltage level of 35kV, the invention provides the coil winding method which has the advantages that the spacing quality of the coil sections meets the requirements of drawings, the running safety of the transformer is high, the process flow is simple, and the operation of workers is time-saving and labor-saving. According to the winding method provided by the invention, before the coil is wound, 6-8 parts of a tape measure and a water pen are uniformly divided in the circumferential direction of the positioning net and marked, the starting position of each section of coil is marked in the axial direction of the marked position, and the fixing belt is embedded into the positioning net from the marked position, wherein two ends of the embedded fixing belt respectively extend out of the starting positions of two adjacent sections of coils. When the coil is wound, the part of the fixing band extending out from the starting position is used for fixing the first turn of the lead of the first layer of the coil and pressing the fixing band to the lower part of the lead, and when the coil is continuously wound to the position of the last turn of the lead according to the turn requirement of each layer of the drawing, the fixing band for fixing the first turn of the lead is used for fixing the last turn of the lead. When other layers of the coil are wound, the positions of the first turn and the last turn of the coil are marked on the interlayer insulation axis by referring to the marked positions in the circumferential direction of the positioning net, so that the wire deviation of the first turn and the last turn caused in the winding process is prevented, and the wire can be checked constantly in the winding process, thereby ensuring the interval between the sections during winding. In the invention, each layer of wires can be integrally fixed only by tightly locking and compacting the first and last turns of wires when the fixing band is bound, and the fixing effect of the first and last turns of wires is better because the fixing band is penetrated into the positioning net fixed with the mould in advance, so that the problem that the first and last turns of wires at the binding position are loosened due to the influence of gravity can be avoided in the coil setting process. And after the coil is wound, another fixing band is taken to carry out full-wrapping winding on the first section of coil and then the first section of coil is bound and fixed in a splayed mode, and each section of coil is integrally bound firmly. And finally, filling filler between every two sections of coils, and fixing the filler by using a fixing belt, so that the distance between the segmented cylindrical coil sections of the dry-type transformer can be ensured. The winding positioning method provided by the invention has the advantages that the section spacing is well ensured, the running safety of the transformer is high, the operation of workers is time-saving and labor-saving, and the cost is reduced.
According to some embodiments of the invention, in the S1, the positioning net is evenly divided into 6 equal parts in the circumferential direction and marked. According to the test of the inventor, the coil and the positioning net can be firmly fixed together on the premise of not wasting manpower as much as possible by dividing the coil into 6 equal parts (namely, fixing each section of the subsequent coil for 6 times at equal intervals by the fixing belt).
According to some embodiments of the invention, the positioning net in S1 comprises a mesh cloth, and/or the fixing band in S2 comprises a glass fiber cloth band.
According to some embodiments of the present invention, the method for embedding the fixing tape in S2 includes: and taking the fixing band to penetrate into the grids of the positioning net from the starting position, extending the penetrating fixing band in the axial direction, and penetrating the fixing band out of the grids of the positioning net from the starting position of the adjacent coil, wherein the two ends of the fixing band extend out and are reserved for 500-600 mm.
According to some embodiments of the present invention, the method for winding the first layer of coil in S3 is as follows: the method for winding the first layer of coil in the step S3 comprises the following steps: the method comprises the steps that a first turn lead of a first layer of coil is wound at the starting position of the first section of coil, when the first turn lead is wound at the position of each section of embedded fixing band, the part, extending out from the starting position, of the fixing band is stretched onto the first turn lead and is folded back and tensioned, the fixing band is pressed below the first layer of lead, when the coil is continuously wound to a last turn lead according to the turn requirement of each layer of drawing, the fixing band tensioning the first turn lead is stretched onto the last turn lead and is folded back and tensioned.
According to some embodiments of the present invention, the method for winding the ascending layer in S3 includes: firstly placing interlayer insulation when each layer of lead is wound in a lifting manner, and respectively marking the positions of the first turn and the last turn of the lifting layer on the interlayer insulation according to the positions of 6-8 equal parts of the circumference of the upper layer; and winding the first turn of the lead of the ascending layer from the first turn position, fixing the first turn of the lead of the ascending layer by using the rest part of the fixing band which is fixed with the last turn of the lead of the upper layer when the lead is wound to the position of 6-8 equal parts, and fixing the last turn of the lead of the ascending layer by using the rest part of the fixing band which is fixed with the upper layer of the lead when the lead is continuously wound to the position of the marked last turn of the lead and when the lead is wound to the position of 6-8 equal parts.
According to some embodiments of the present invention, in S3, the method for full-package winding eight-word banding is: and bending the last turn of the wire of the outermost coil of the first section of coil, winding a plurality of layers of the wire by using another fixing belt along the circumferential direction of the wire, then leading out the wire, carrying out full-wrapping winding on the outermost coil by using the fixing belt, winding 3-5 layers of the outermost coil by using the fixing belt in a full-wrapping manner, and then fixing the first section of coil by adopting a splayed binding manner.
In the invention, after a section of coil is wound, another fixing band is taken to fix the whole section of coil, and the fixing method comprises the following steps: and bending the last turn of the wire of the outermost coil of the wound coil, winding a plurality of layers of fixing bands along the circumferential direction of the wire, leading out the wire, winding the outermost coil in a full-wrapping mode by using the fixing bands, winding the outermost coil in 3-5 layers in the full-wrapping mode by using the fixing bands, and fixing the first section of coil in a splayed binding mode. The eight characters binding mode is as follows: the fixing band is wound for three circles along the circumferential direction of the coil, the fixing band is obliquely pulled to the end part of the coil and wound for a distance through the uninterrupted winding process, and then the fixing band is obliquely pulled to the other end of the coil and wound for a distance.
According to some embodiments of the invention, in the S5, the filler includes a mesh cloth.
According to some embodiments of the invention, in the S5, between each two sections of coils, 6 to 8 fillers are arranged, and the fillers are distributed at equal intervals and axially filled into a straight line.
According to some embodiments of the present invention, in S5, between each two segments of coils, multiple layers of the fillers with different widths are disposed according to the distance between the coils of each layer of each segment.
Different from the prior art that resin blocks are filled among all sections of coils for fixing, the filler in the invention adopts mesh cloth. The mesh cloth is folded to a proper thickness and is stuffed between the sections, because the intervals of the layers between the two sections of coils are different, the width of the mesh cloth stuffed between the different layers is also different, and the mesh cloth is determined according to the actual distance between the layers. The grid cloth is equally divided into 6-8 parts in the coil direction for equidistant filling, and preferably, the grid cloth is equally divided into 6 equal parts for filling. Meanwhile, the gridding cloth filled between the sections is ensured to be in a straight line in the axial direction, and the deviation is not more than 10 mm. And after filling, taking a glass fiber cloth belt to bind and fix the filler. The invention has the advantages that the grid cloth is selected: compared with the resin block in the prior art, the mesh cloth is easier to be poured through during pouring, so that the product quality is ensured.
The invention is further illustrated by the following specific examples.
Example 1
Winding a dry-type transformer sectional cylinder type coil (12 sections)
(1) And inspecting a die for winding a coil, winding a layer of mesh cloth on the outer layer of the die for winding the coil, and winding and binding the mesh cloth in the circumferential direction of the die by using a glass fiber cloth belt so as to fix the mesh cloth on the die. Uniformly dividing the grid cloth into 6 equal parts in the circumferential direction and marking, and then marking the starting position of each section of 12 sections of coils in the axial direction of the marked position according to the requirements of a drawing;
(2) pre-embedding a glass fiber cloth belt: according to the start position of each segment of the coil marked in S1, taking the first segment of the coil as an example: corresponding to each 6 equal-dividing points, taking a glass fiber cloth belt to penetrate into the grid of the grid cloth from the starting position of the first section of coil, ensuring that the glass fiber cloth belt is reserved with 500-600 mm at the starting position to extend out of the grid cloth, extending the glass fiber cloth belt penetrating into the glass fiber cloth belt along the axial direction, penetrating the glass fiber cloth belt out of the grid cloth from the starting position of the second section of coil, ensuring that the glass fiber cloth belt is reserved with 500-600 mm at the starting position of the second section of coil and extends out of the grid cloth, and penetrating the glass fiber cloth belt into each 6 equal-dividing points according to the starting positions of the first section of coil and the second section of coil in the same method, namely embedding 6 sections of glass fiber cloth belts at equal intervals on the position of the first section of coil; embedding glass fiber cloth belts in the positions of the rest coils by the same method of embedding the glass fiber cloth belts as the first section of coils;
(3) winding a coil: taking a winding method of a first section of coil as an example, winding a first layer of coil from the starting position of the first section of coil, when a first turn of lead of the first layer of coil is wound to a pre-embedded glass fiber cloth belt on the starting position, stretching a reserved glass fiber cloth belt of 500-600 mm onto the first turn of lead, folding back and tensioning, pressing the glass fiber cloth belt below the first layer of lead, and when the coil is continuously wound to a last turn of lead according to the turn requirement of each layer of drawing, stretching the glass fiber cloth belt onto the last turn of lead, folding back, tensioning and fixing. The 6 sections of glass fiber cloth belts can firmly fix the first and last turns of the conducting wires of the first layer of coils and the grid cloth by repeating the operation;
after the first layer of coil is wound, ascending layer winding is carried out, interlayer insulation is placed before ascending layer winding is carried out, and the positions of the first turn and the last turn of the ascending layer are respectively marked on the interlayer insulation according to the positions of 6 equal parts of the circumference of the first layer of coil; and winding the first turn of the lead wire of the lifting layer from the first turn position, fixing the first turn of the lead wire of the lifting layer by using the rest part of the glass fiber cloth belt fixed with the last turn of the lead wire of the upper coil when the lead wire is wound to 6 equal parts, pressing the glass fiber cloth belt below the lead wire, and fixing the last turn of the lead wire of the lifting layer by using the rest part of the glass fiber cloth belt when the coil is continuously wound to the marked last turn position and when the lead wire is wound to 6 equal parts. And repeating the operation on the 6 sections of glass fiber cloth belts to firmly fix the last turn of the lead of the lifting layer with the last layer of coil and the mesh cloth. And winding the rest layers by the same method until the first section of coil is wound.
After the first section of coil is wound, the last turn of lead of the outermost coil of the first section of coil is bent, another glass fiber cloth tape is taken to wind a plurality of layers of wires in the circumferential direction of the lead and then is led out, the outermost coil is wound in a full-wrapping mode through the glass fiber cloth tape, the outermost coil is wound in a full-wrapping mode for 3-5 layers through the fixing tape, and then the first section of coil is fixed in a splayed binding mode. The eight characters binding mode is as follows: winding the glass fiber cloth belt for three circles along the circumferential direction of the coil, obliquely pulling the glass fiber cloth belt to the end part of the coil and winding for a certain distance continuously in the winding process, and then obliquely pulling the glass fiber cloth belt to the other end of the coil and winding for a certain distance;
s4: continuously winding the rest 11 sections of coils according to the marked positions of the sections of coils by using the same winding method as the first section of coil;
s5: after the coil is wound, six points are uniformly distributed between sections for filling, the width of the filled gridding cloth takes the actual width between each layer of each section as a reference, after the filling of the grids between the sections is finished, the filled gridding cloth is bound and fixed by a glass fiber cloth belt, the glass fiber gridding cloth filled between the sections forms a straight line in the axial direction, and the deviation is not more than 10 mm.
The method in the embodiment is used for winding the dry type transformer coil of the wind power project, after the coil is poured, the coil height and the distance between each section of the coil are tested by using the coil internal structure detection system, the test result is shown in table 1, and the data in table 1 can show that the distance between the sections of the finished coil after pouring meets the drawing requirements.
TABLE 1
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A winding positioning method of a segmented cylindrical coil of a dry-type transformer is characterized by comprising the following steps:
s1: winding and fixing a positioning net on a mould for winding a coil, uniformly dividing the positioning net into 6-8 equal parts in the circumferential direction and marking, and marking the starting position of each segment of the coil in the axial direction of the marking position;
s2: according to the starting position of each section of coil marked in S1, embedding a fixing band between the positioning net and the mould in each section, wherein two ends of the fixing band respectively extend out of the starting positions of two adjacent sections of coils;
s3: winding a first layer of coil from the starting position of the first section of coil, fixing a first turn of lead of the first layer of coil by using the part of the fixing band extending out of the starting position and pressing the fixing band to the lower part of the lead when the first layer of coil is wound to the position of 6-8 equal parts, and fixing a last turn of lead by using the fixing band for fixing the first turn of lead when the coil is continuously wound to the position of the last turn of lead according to the turn requirement of each layer of drawing; when the first layer of coil is wound to perform ascending winding, firstly placing interlayer insulation and then winding, fixing the first layer of coil by the same method as the first layer of coil until the first section of coil is wound, and then taking another fixing belt to perform full-wrapping winding on the first section of coil and then binding and fixing the first section of coil in a splayed manner;
s4: winding the rest sections of coils by the same winding method as the first section of coils;
s5: and filling filler between every two sections of coils, and fixing the filler by using a fixing band.
2. The winding positioning method according to claim 1, wherein in S1, the positioning net is divided into 6 equal parts in the circumferential direction and marked.
3. The winding positioning method according to claim 1, wherein in S1, the positioning net comprises a mesh cloth, and/or
The fixing band in S2 comprises a glass fiber cloth band.
4. The winding positioning method according to claim 1, wherein the method for embedding the fixing belt in the S2 comprises the following steps: and taking the fixing band to penetrate into the grids of the positioning net from the starting position, extending the penetrating fixing band along the axial direction, penetrating the fixing band out of the grids of the positioning net from the starting positions of the two adjacent sections of coils, and extending out of two ends of the fixing band and reserving 500-600 mm.
5. The winding positioning method of claim 1, wherein the winding of the first layer of coil in S3 is performed by: the method comprises the steps that a first turn lead of a first layer of coil is wound at the starting position of the first section of coil, when the first turn lead is wound at the position of each section of embedded fixing band, the part, extending out from the starting position, of the fixing band is stretched onto the first turn lead and is folded back and tensioned, the fixing band is pressed below the first layer of lead, when the coil is continuously wound to a last turn lead according to the turn requirement of each layer of drawing, the fixing band tensioning the first turn lead is stretched onto the last turn lead and is folded back and tensioned.
6. The winding positioning method of claim 1, wherein the step S3 is performed by a method comprising: firstly placing interlayer insulation when each layer of lead is wound in a lifting manner, and respectively marking the positions of the first turn and the last turn of the lifting layer on the interlayer insulation according to the positions of 6-8 equal parts of the circumference of the upper layer; and winding the first turn of the lead of the lifting layer from the first turn position, fixing the first turn of the lead of the lifting layer by using the rest part of the fixing band which is fixed with the last turn of the lead of the upper coil when the lead of the lifting layer is wound to the position of 6-8 equal parts, and fixing the last turn of the lead of the lifting layer by using the rest part of the fixing band which is fixed with the first turn of the lead of the lifting layer when the lead of the lifting layer is continuously wound to the marked last turn position and when the lead of the lifting layer is wound to the position of 6-8 equal parts.
7. The winding positioning method according to claim 1, wherein in S3, the method for full-package winding and then eight-character binding comprises: and bending the last turn of the wire of the outermost coil of the first section of coil, winding a plurality of layers of the wire by using another fixing belt along the circumferential direction of the wire, then leading out the wire, carrying out full-wrapping winding on the outermost coil by using the fixing belt, winding 3-5 layers of the outermost coil by using the fixing belt in a full-wrapping manner, and then fixing the first section of coil by adopting a splayed binding manner.
8. The winding positioning method according to claim 1, wherein in S5, the filler includes a mesh cloth.
9. The winding positioning method according to claim 1, wherein in the step S5, 6-8 fillers are arranged between every two sections of coils, are distributed at equal intervals, and are axially filled into a straight line.
10. The winding positioning method according to claim 1, wherein in S5, between each two segments of coils, a plurality of layers of the fillers with different widths are provided according to the distance between the coils of each layer of each segment.
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| CN202111483198.XA CN114156083B (en) | 2021-12-07 | 2021-12-07 | Winding positioning method for sectional cylindrical coil of dry-type transformer |
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| CN103474230A (en) * | 2013-09-06 | 2013-12-25 | 合肥鑫伟电力设备有限公司 | Sectional cylindrical coil winding process |
| CN106816283A (en) * | 2017-03-28 | 2017-06-09 | 上海电变压器有限公司 | A kind of resin casting dry-type transformer high-voltage coil structure, winding method and transformer |
| US20190392981A1 (en) * | 2017-06-23 | 2019-12-26 | Haihong Electric Co., Ltd. | Three-dimensional wound core open dry-type transformer coil structure and winding method therefor |
| CN211045229U (en) * | 2019-12-25 | 2020-07-17 | 浙江科热电气有限公司 | Low partial discharge high-toughness dry-type transformer high-voltage coil structure |
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| CN101308721A (en) * | 2007-05-14 | 2008-11-19 | 沈阳昊诚电气有限公司 | Epoxy cast dry transformer |
| CN101556864A (en) * | 2009-01-23 | 2009-10-14 | 广东海鸿变压器有限公司 | Method for winding resin insulating dry type transformer coil |
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