CN118098784A - Double-spiral low-voltage coil of oil-immersed distribution transformer and winding process thereof - Google Patents
Double-spiral low-voltage coil of oil-immersed distribution transformer and winding process thereof Download PDFInfo
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- CN118098784A CN118098784A CN202410253698.1A CN202410253698A CN118098784A CN 118098784 A CN118098784 A CN 118098784A CN 202410253698 A CN202410253698 A CN 202410253698A CN 118098784 A CN118098784 A CN 118098784A
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- 238000004804 winding Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 13
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- 230000008093 supporting effect Effects 0.000 claims abstract description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000000670 limiting effect Effects 0.000 claims abstract description 29
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 43
- 238000010079 rubber tapping Methods 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 11
- 230000001680 brushing effect Effects 0.000 claims description 9
- 239000002966 varnish Substances 0.000 claims description 9
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000001976 improved effect Effects 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 230000000712 assembly Effects 0.000 abstract 2
- 238000000429 assembly Methods 0.000 abstract 2
- 230000017525 heat dissipation Effects 0.000 description 17
- 230000006835 compression Effects 0.000 description 15
- 238000007906 compression Methods 0.000 description 15
- 230000032683 aging Effects 0.000 description 6
- 230000001939 inductive effect Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
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- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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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
- H01F41/076—Forming taps or terminals while winding, e.g. by wrapping or soldering the wire onto pins, or by directly forming terminals from the wire
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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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- 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
- H01F41/096—Dispensing or feeding devices
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- 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
- H01F41/127—Encapsulating or impregnating
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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Abstract
The invention relates to the technical field of low-voltage coils and discloses a double-spiral low-voltage coil of an oil-immersed distribution transformer and a winding process thereof, wherein an insulating wire sleeve is wound and assembled on the outer side of an iron core, an insulating isolation sleeve is sleeved and assembled on the outer side of the insulating wire sleeve, two groups of low-voltage coils which are arranged in parallel are wound and assembled in the insulating wire sleeve side by side, liquid collecting sleeves which are assembled on the outer side of the low-voltage coil in a sealing mode are fixedly connected at two ends of the insulating wire sleeve, liquid guide pipes are assembled on the liquid collecting sleeves in a communicating mode, supporting seats which are matched with the low-voltage coils are fixedly arranged on the inner side walls of the insulating wire sleeve, limiting assemblies are assembled between the two groups of low-voltage coils, copper bars and copper bar materials are saved, manufacturing cost is reduced, assembly efficiency of the transformer is improved, supporting and protection is carried out between the two groups of low-voltage coils through the limiting assemblies, and meanwhile, the insulation effect is achieved, and the condition that wires are connected together after the outer insulating layers of the low-voltage coils are aged and fall down is prevented.
Description
Technical Field
The invention relates to the technical field of low-voltage coils, in particular to a double-spiral low-voltage coil of an oil-immersed distribution transformer and a winding process thereof.
Background
At present, the rural power grid power load in China has obvious seasonal characteristics, and has the common overload problem in a short time in summer and high-temperature seasons and spring festival, so that the phenomena of rapid temperature rise and insulation aging acceleration of the distribution transformer winding and the insulation oil are easy to cause the overheat burning of the transformer when the temperature of the distribution transformer winding and the insulation oil are severe.
The low-voltage side of the variable-frequency transformer is formed by arranging a plurality of coils with different phase-shifting angles in the axial direction of a transformer core, and as the positions of the low-voltage coils in a leakage magnetic field of the transformer are different, the impedance of the low-voltage coils is also different, and the heating conditions of the low-voltage windings are different.
In the prior art, in the coil structure of the energy-saving variable frequency transformer with the application number of 202123384157.3, the phase-shifting winding adopts a plurality of groups of parallel structures, the basic winding is of a continuous coil structure, although the low-voltage winding is increased along with the increase of cake number, the radiating surface of the winding is increased, the temperature rise speed of the winding is reduced, but the effect is not ideal, and the existing high overload capacity oil immersed type distribution transformer is characterized in that a plurality of oil ducts which are arranged along the axial direction are additionally arranged between the high-voltage coil and the low-voltage coil of the winding, so that cooling oil in a box body can enter between the high-voltage coil and the low-voltage coil, the internal and external simultaneous heat dissipation of the winding is realized, however, in the transformer with the multi-coil winding, gaps between the coils are too small, so that the cooling oil flows less, the heat absorption speed is relatively slow, the heat conduction efficiency is low, the temperature of the oil around the low-voltage coil is obviously higher than the oil temperature at the wall of the box body, the low-voltage coil is positioned inside the winding, the low-voltage coil is also subjected to the heat dissipation efficiency of the high-voltage coil, and the low-voltage coil is even arranged along the axial direction of the low-voltage coil, and the low-voltage coil is in the heat dissipation efficiency is limited, and the heat dissipation efficiency is high, and the heat dissipation efficiency is arranged along the axial direction of the low-voltage coil is formed by the low-frequency coil, and the heat dissipation efficiency is limited, and the heat loss is greatly due to the heat loss, and the heat loss is caused.
Therefore, it is necessary to solve the above problems by a double-spiral low-voltage coil of an oil-immersed distribution transformer and a winding process thereof.
Disclosure of Invention
The invention aims to provide a double-spiral low-voltage coil of an oil-immersed distribution transformer and a winding process thereof, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the double-spiral low-voltage coil of the oil-immersed distribution transformer comprises a first phase coil winding, a second phase coil winding and a third phase coil winding which are identical in structure composition, wherein a head end lead copper bar is arranged above the first phase coil winding, the second phase coil winding and the third phase coil winding, and a tail end lead copper bar is arranged below the first phase coil winding, the second phase coil winding and the third phase coil winding.
The first phase coil winding comprises an iron core, an insulating wire sleeve is wound and assembled on the outer side of the iron core, an insulating isolation sleeve is sleeved and assembled on the outer side of the insulating wire sleeve, two groups of low-voltage coils which are arranged in parallel are wound and assembled in the insulating wire sleeve side by side, tapping switches are fixedly assembled at the end parts of the low-voltage coils, liquid collecting sleeves which are hermetically assembled on the outer side of the low-voltage coils are fixedly connected with two ends of the insulating wire sleeve, a liquid guide pipe is assembled on the liquid collecting sleeve in a communicating mode, a supporting seat which is matched with the low-voltage coils is fixed on the inner side wall of the insulating wire sleeve, and a limiting assembly is assembled between the low-voltage coils.
The outer side wall of the insulated wire sleeve is assembled in a fitting mode and spirally wound on the outer side of the iron core, the outer side wall of the insulated wire sleeve is attached to the iron core, and a cooling channel is arranged between the outer side wall of the insulated wire sleeve and the inner side wall of the insulated isolation sleeve.
Preferably, the spacing subassembly includes spacing seat, the below opposite assembly of going up spacing seat is equipped with down spacing seat, go up spacing seat and down be connected through the ripple cover between the spacing seat, be fixed with the urceolus on the spacing seat inside wall of going up, be fixed with the inner tube on the spacing seat inside wall down, inner tube and urceolus grafting movable assembly, the top of inner tube extends to urceolus inner chamber fixedly connected with supporting spring, the top of supporting spring is fixed at urceolus interior top.
Preferably, an expansion air bag arranged on the inner side of the supporting spring is fixed in the middle of the top of the inner cavity of the outer cylinder, an induction contact is fixedly assembled at the bottom end of the expansion air bag, and an induction contact piece matched with the induction contact is fixed at the bottom of the inner cavity of the inner cylinder.
Preferably, the length of spacing subassembly and low voltage coil adaptation, the supporting seat is two sets of and the symmetry is fixed top and bottom in insulating wire cover, and all is provided with the centre gripping recess with low voltage coil adaptation on two sets of supporting seats.
Preferably, the two groups of low-voltage coils are identical in size, the two groups of low-voltage coils comprise insulation protection sleeves on the outer sides, coil cores are arranged in the insulation protection sleeves, and the intervals between the two groups of low-voltage coils are kept consistent.
Preferably, the upper limit seat and the lower limit seat are the same in size, the upper limit seat and the lower limit seat are arc-shaped seats, the upper low-voltage coil is clamped and assembled between the upper limit seat and the upper support seat, and the lower low-voltage coil is clamped and assembled between the lower limit seat and the lower support seat.
Preferably, the liquid collecting sleeve is a rectangular seat, the hollow inside the liquid collecting sleeve is communicated with the inner cavity of the insulating wire sleeve, and anti-corrosion layers are sprayed on the inner side walls of the liquid collecting sleeve and the insulating wire sleeve.
Preferably, the other end of the upper group of liquid guide pipes is connected with an external pump, the sensing contact and the sensing contact are electrically connected with an external controller through wires, the lower group of liquid guide pipes is connected with an external cooling oil tank, and the external pump is fixedly assembled on the external cooling oil tank.
A winding process of double-spiral low-voltage coils of an oil-immersed distribution transformer comprises the following specific steps:
S1: the coil winding needs to be prepared and molded in advance according to the actual structural composition before being wound;
S2: the ends of the two groups of low-voltage coils are fixed by using self-adhesive tapes, a traction rope is fixed on the self-adhesive tapes, the traction rope penetrates out of the insulated wire sleeve, then the two groups of low-voltage coils penetrate through the liquid collecting sleeve and are correspondingly clamped and assembled between the limiting assembly and the two groups of supporting seats, and the traction rope is pulled to drive the two groups of low-voltage coils to be spliced and assembled inside the insulated wire sleeve;
S3: one ends of the two groups of low-voltage coils are pulled by utilizing a pulling rope, when the low-voltage coils pass through the liquid collecting sleeve, sealing rings are arranged at the assembling positions of the low-voltage coils and the liquid collecting sleeve, and tapping switches are arranged at the top ends and the bottom ends of the two groups of low-voltage coils, so that the fixed installation of the two groups of low-voltage coils is realized;
s4: uniformly brushing impregnating varnish on the outer side of the iron core, sequentially winding and assembling the insulating wire sleeve assembled with the low-voltage coil on the outer side wall of the iron core clockwise, and simultaneously ensuring close fit between the outer side walls of the insulating wire sleeve until the winding of the iron core is completed;
s5: uniformly brushing impregnating varnish on the outer side wall of the insulating isolation sleeve, brushing impregnating varnish on the surface of the insulating wire sleeve after the winding of the insulating wire sleeve is completed, then placing the iron core and the insulating wire sleeve inside the insulating isolation sleeve, and sequentially setting the iron core and the insulating wire sleeve to complete the winding work of the first phase coil winding, the second phase coil winding and the third phase coil winding;
S6: and finally, connecting the tapping switches at the upper tops of the first phase coil winding, the second phase coil winding and the third phase coil winding with the lead copper bars at the head end, and connecting the tapping switches at the upper bottoms of the first phase coil winding, the second phase coil winding and the third phase coil winding with the lead copper bars at the tail end.
The invention has the technical effects and advantages that:
1. The upper ends of the low-voltage coils are connected with the lead copper bars at the head end, the lower ends of the low-voltage coils are connected with the lead copper bars at the tail end, the arrangement structure of the low-voltage coils of the oil-immersed transformer can be greatly simplified, copper bars and copper bar materials are saved, manufacturing cost is reduced, assembly efficiency of the transformer is improved, insulation protection effect on the low-voltage coils is improved through the insulation wire sleeve, wires are prevented from being exposed due to insulation aging, thermal protection is improved, meanwhile, the low-voltage coils are all arranged in the insulation wire sleeve in a limiting mode through the supporting seat, limiting treatment can be achieved on the low-voltage coils, displacement of the low-voltage coils after the low-voltage coils are subjected to electromagnetic moment is prevented, transformation work of the transformer is seriously affected, supporting protection is carried out between the two groups of low-voltage coils through the limiting assembly, meanwhile, the insulation effect is achieved, the situation that the wires are connected together after the external insulation layers of the low-voltage coils are aged and fall is prevented, and short circuit risks are avoided.
2. According to the invention, when the cooling oil is led into the liquid collecting sleeve through the liquid guide pipe, the cooling oil can directly flow into the insulating wire sleeve, so that the cooling oil can actively circulate in the insulating wire sleeve, heat generated during operation of the low-voltage coil can be led away, meanwhile, as the insulating wire sleeve is tightly attached to the iron core, heat generated during operation of the iron core can be thermally conducted into the cooling oil in the transformer, and can be also thermally conducted into the insulating wire sleeve, so that the heat radiating effect of the iron core during operation is improved, and then the heat is brought out of the transformer to radiate along with the circulation of the cooling oil, so that the problem of low radiating speed during operation of the low-voltage coil can be completed from the inner layer and the outer layer, meanwhile, the heat radiated by the high-voltage coil can be rapidly conducted, the problem of small radiating area and poor radiating performance can be solved, the service life of the transformer can be prolonged, the overload capacity of the low-voltage coil can be improved, the maintenance times can be reduced, the capacity of the distribution transformer of the rural power network can be increased, and the investment cost can be saved.
3. According to the invention, the degree of electromagnetic force moment born by the two groups of low-voltage coils can be indirectly obtained through the compression deformation of the supporting springs, then the overload property of the low-voltage coils can be detected in real time according to the electromagnetic force moment, so that targeted overload protection measures are taken, heat is generated when the low-voltage coils work, therefore, the heat conduction is realized on the heat on the low-voltage coils by the cooling oil in the insulating wire sleeve in cooperation with the cooling oil outside the insulating wire sleeve, the heat dissipation is improved, then the expansion air bags expand after being heated due to the existence of the heat, thus the temperature of the environment where the low-voltage coils are positioned can be reflected in real time according to the expansion amount of the expansion air bags, a detection basis can be provided for the work protection of the low-voltage coils, the work state of the low-voltage coils is comprehensively evaluated according to the temperature attribute and the electromagnetic force moment of overload current, and then the corresponding protection measures are taken.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic view of the structure of the first phase coil winding of the present invention.
Fig. 3 is a schematic view of the overall structure of the insulated wire jacket of the present invention.
Fig. 4 is a schematic view of a partial assembly structure of the present invention.
Fig. 5 is a schematic view of a partial structure of an insulated wire jacket according to the present invention.
Fig. 6 is an enlarged schematic view of the structure of the portion a of the present invention.
Fig. 7 is a schematic structural diagram of a limiting assembly according to the present invention.
In the figure: 1. a first phase coil winding; 11. an iron core; 12. an insulated wire sleeve; 13. an insulating spacer sleeve; 14. a low voltage coil; 15. a tap changer; 16. a liquid collecting sleeve; 17. a catheter; 18. a support base; 19. a limit component; 191. an upper limit seat; 192. a lower limit seat; 193. a corrugated sleeve; 194. an outer cylinder; 195. an inner cylinder; 196. a support spring; 197. inflating the balloon; 198. a sensing contact; 199. sensing a contact; 2. a second phase coil winding; 3. a third phase coil winding; 4. a head end lead copper bar; 5. and the tail end leads to a copper bar.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
First embodiment
The invention provides a double-spiral low-voltage coil of an oil-immersed distribution transformer, which is shown in fig. 1 to 6, and comprises a first phase coil winding 1, a second phase coil winding 2 and a third phase coil winding 3 which are identical in structure composition, wherein a head end lead copper bar 4 is arranged above the first phase coil winding 1, the second phase coil winding 2 and the third phase coil winding 3, and a tail end lead copper bar 5 is arranged below the first phase coil winding 1, the second phase coil winding 2 and the third phase coil winding 3.
The three-phase coil structures of the first phase coil winding 1, the second phase coil winding 2 and the third phase coil winding 3 are identical, the upper ends of the low-voltage coils 14 are connected with the lead copper bars 4 at the head end, and the lower ends of the low-voltage coils are connected with the lead copper bars 5 at the tail end, so that the arrangement structure of the low-voltage coils of the oil-immersed transformer can be greatly simplified, copper bars and copper bar materials are saved, the manufacturing cost is reduced, and the assembly efficiency of the transformer is improved.
Referring to fig. 2-4, the first phase coil 1 includes an iron core 11, an insulating wire sleeve 12 is wound and assembled on the outer side of the iron core 11, an insulating isolation sleeve 13 is sleeved and assembled on the outer side of the insulating wire sleeve 12, two groups of low-voltage coils 14 arranged in parallel are wound and assembled in the insulating wire sleeve 12 side by side, tapping switches 15 are fixedly assembled at the ends of the two groups of low-voltage coils 14, liquid collecting sleeves 16 which are hermetically assembled on the outer side of the low-voltage coils 14 are fixedly connected with both ends of the insulating wire sleeve 12, a liquid guide tube 17 is assembled on the liquid collecting sleeves 16 in a communicating manner, a supporting seat 18 which is matched with the low-voltage coils 14 is fixed on the inner side wall of the insulating wire sleeve 12, and a limiting assembly 19 is assembled between the two groups of low-voltage coils 14.
The first phase coil winding 1, the second phase coil winding 2 and the third phase coil winding 3 are isolated through the insulating isolation sleeve 13, the isolation effect between the coils is improved, meanwhile, the low-voltage coils 14 are wound on the outer side of the iron core 11 in a bidirectional spiral mode, the magnetic fields of the two groups of low-voltage coils 14 are overlapped to strengthen the magnetic fields, and accordingly the load capacity of the low-voltage coils 14 is improved, meanwhile, the insulating wire sleeve 12 is sleeved on the outer sides of the two groups of low-voltage coils 14, the insulating protection effect on the low-voltage coils 14 is improved through the insulating wire sleeve 12, the wires are prevented from being exposed due to insulating ageing, the thermal protection performance is improved, meanwhile, the low-voltage coils 14 are all installed in the insulating wire sleeve 12 in a limiting mode through the supporting seat 18, the low-voltage coils 14 are prevented from being displaced after the electromagnetic moment is received, the transformer work of the transformer is seriously affected, the two groups of low-voltage coils 14 are supported and protected through the limiting assembly 19, and the situation that the wires are connected together after the outer insulating layers of the low-voltage coils 14 are aged and fall is prevented, and the risk of short circuit is avoided.
It is worth noting that the liquid guide tube 17, the liquid collecting sleeve 16 and the inside of the insulating wire sleeve 12 are communicated, when cooling oil is led into the liquid collecting sleeve 16 through the liquid guide tube 17, the cooling oil can directly flow into the insulating wire sleeve 12, cooling oil can be enabled to actively circulate in the insulating wire sleeve 12, heat generated during operation of the low-voltage coil 14 can be led away, meanwhile, due to the fact that the insulating wire sleeve 12 is tightly attached to the iron core 11, heat generated during operation of the iron core 11 can be conducted into the cooling oil in the transformer, heat can be conducted into the insulating wire sleeve 12 through heat conduction, the heat dissipation effect of the iron core 11 during operation is improved, then heat is carried out of the transformer to dissipate heat along with circulation of the cooling oil, the problem that the heat dissipation speed of the low-voltage coil 14 during operation of the inner layer and the outer layer is low can be achieved, meanwhile, the heat emitted by the high-voltage coil can be rapidly conducted, the problem that the heat dissipation area is small and the heat dissipation performance is poor is solved, the service life of the transformer is prolonged, overload capacity of the low-voltage coil 14 can be improved, maintenance times can be reduced, the power distribution capacity of the transformer is increased, and investment cost of the rural power distribution network is saved.
The outer side wall of the insulating wire sleeve 12 is assembled in a fitting way and spirally wound on the outer side of the iron core 11, the outer side wall of the insulating wire sleeve 12 is attached to the iron core 11, a spiral limiting protruding edge matched with the insulating wire sleeve 12 is fixed on the outer side wall of the iron core 11, the insulating wire sleeve 12 can be abutted against and assembled on the spiral limiting protruding edge, limiting treatment of the insulating wire sleeve 12 can be achieved, the situation of deflection is prevented, a cooling channel is arranged between the outer side wall of the insulating wire sleeve 12 and the inner side wall of the insulating isolation sleeve 13, heat generated during operation of the iron core 11 can be conducted into cooling oil in a transformer in a heat conducting way, the heat dissipation effect during operation of the iron core 11 can be improved, and heat can be led into the space between the insulating isolation sleeves 13 through the insulating wire sleeve 12 during heat dissipation operation, so that the situation of excessively large load and heat increase in a short time of the low-voltage coil 14 can be relieved, and the heat protection is improved.
The length of spacing subassembly 19 and low voltage coil 14 adaptation, supporting seat 18 is two sets of just symmetry fix top and bottom in insulating wire cover 12, and all be provided with the centre gripping recess with low voltage coil 14 adaptation on two sets of supporting seat 18, can realize spacing processing to low voltage coil 14, prevent that low voltage coil 14 from taking place the displacement after receiving electromagnetic moment, can seriously influence the transformation work of transformer like this, and support the guard through spacing subassembly 19 between two sets of low voltage coil 14, play the isolation effect simultaneously, prevent that low voltage coil 14 outside insulating layer ageing from taking place behind the drop wire link together and the condition of short circuit from taking place, avoid the short circuit risk.
The two groups of low-voltage coils 14 are the same in size, the two groups of low-voltage coils 14 comprise insulation protection sleeves on the outer sides, coil cores are arranged in the insulation protection sleeves, the distance between the two groups of low-voltage coils 14 is kept consistent, and the magnetic fields are enhanced by overlapping the magnetic fields of the two groups of low-voltage coils 14, so that the overcurrent load capacity of the low-voltage coils 14 is improved.
The liquid collecting sleeve 16 is a rectangular seat, the inside of the liquid collecting sleeve 16 is hollow and is communicated with the inner cavity of the insulating wire sleeve 12, an anti-corrosion layer is sprayed on the inner side walls of the liquid collecting sleeve 16 and the insulating wire sleeve 12, cooling oil in the liquid guide tube 17 is conveniently led into the liquid collecting sleeve 16, and the thermal protection of the cooling oil on the low-voltage coil 14 is improved.
The other end of the upper side liquid guide pipe 17 is connected with an external pump, a semiconductor refrigerating sheet is fixedly assembled on the upper side liquid guide pipe 17, the lower side liquid guide pipe 17 is connected with an external cooling oil tank, and the external pump is fixedly assembled on the external cooling oil tank, so that when cooling oil is led into the liquid collecting sleeve 16 through the liquid guide pipe 17, the cooling oil can directly flow into the insulating wire sleeve 12, the cooling oil can actively circulate in the insulating wire sleeve 12, heat generated during operation of the low-voltage coil 14 can be guided away, the semiconductor refrigerating sheet can conduct heat exchange cooling on the cooling oil transmitted in the liquid guide pipe 17 during operation, the temperature of the cooling oil can be further reduced, the heat exchange effect is improved, the condition that the low-voltage coil 14 is burnt out due to heat accumulation caused by unbalanced heat generation and heat dissipation is prevented, and the heat protection is improved.
Second embodiment
In the working process of the first embodiment, because most of low-voltage lines in rural areas are not maintained in place, the possibility of overload is greatly increased, so that the current of the transformer exceeds the rated current by several times or even tens of times, at this time, the electromagnetic torque applied to the low-voltage coil 14 in the winding is larger, and displacement deformation occurs, but because of the existence of the supporting seat 18 and the limiting component 19, the low-voltage coil 14 has a limiting effect, so that the low-voltage coil 14 cannot shift due to the increase of the electromagnetic torque, and has corresponding overload capability, however, because of the rapid increase of the current, the coil temperature of the distribution transformer is rapidly increased, thereby causing insulation to accelerate aging, and then forming fragment-like shedding, so that the wires of the low-voltage coil 14 in the insulation wire sleeve 12 are exposed to cause inter-turn wire connection to cause short circuit, and the risk of burning the distribution transformer is provided in the present application, based on the following improvement scheme:
As shown in fig. 6 and 7, the limiting assembly 19 includes an upper limiting seat 191, a lower limiting seat 192 is oppositely assembled below the upper limiting seat 191, the upper limiting seat 191 and the lower limiting seat 192 are connected through a corrugated sleeve 193, an outer cylinder 194 is fixed on the inner side wall of the upper limiting seat 191, an inner cylinder 195 is fixed on the inner side wall of the lower limiting seat 192, the inner cylinder 195 and the outer cylinder 194 are movably assembled in a plugging manner, the top end of the inner cylinder 195 extends to an inner cavity of the outer cylinder 194 to be fixedly connected with a supporting spring 196, the top end of the supporting spring 196 is fixed at the inner top of the outer cylinder 194, an expansion air bag 197 is fixed in the middle of the top of the inner cavity of the outer cylinder 194 and is arranged at the inner side of the supporting spring 196, an inductive contact 198 is fixedly assembled at the bottom end of the expansion air bag 197, an inductive contact 199 matched with the inductive contact 198 is fixed at the bottom of the inner cavity of the inner cylinder 195, and the inductive contact 198 and the inductive contact 199 are electrically connected with an external controller through wires.
In practical use, the spacing subassembly 19 accomplishes the spacing to between two sets of low-voltage coil 14 through the holding power of supporting spring 196, therefore when the electric current suddenly increases on low-voltage coil 14, the electromagnetic moment of low-voltage coil 14 in the magnetic field becomes big, because supporting seat 18 has the non-deformability, consequently supporting seat 18 can provide spacing effect to low-voltage coil 14, and go up spacing seat 191 and lower spacing seat 192 size the same, and go up spacing seat 191 and lower spacing seat 192 are the arc seat, the low-voltage coil 14 centre gripping assembly of upside is between last spacing seat 191 and upper-side supporting seat 18, the low-voltage coil 14 centre gripping assembly of downside is between lower spacing seat 192 and lower-side supporting seat 18, so the electromagnetic moment of low-voltage coil 14 can make the low-voltage coil 14 of upside produce the extrusion force to spacing subassembly 19 when becoming big, and because spiral spacing protruding stupefied has spacing effect to insulating wire cover 12, consequently, the low-voltage coil 14 of upside is extruded spacing subassembly 19, supporting spring 196 can be compressed like this, consequently, can be compressed by the compression of two sets of low-voltage coil 14 of low-voltage coil that can receive the degree of electromagnetic moment indirect measure according to the low-voltage moment of supporting spring 196, thereby the overload measure is big, and overload measure is done to the overload measure.
It should be noted that, because the low-voltage coil 14 generates heat during operation, the cooling oil inside the insulating wire sleeve 12 cooperates with the cooling oil outside the insulating wire sleeve 12 to realize heat conduction on the low-voltage coil 14, so as to improve heat dissipation, and then the expansion air bag 197 expands after being heated due to the existence of heat, so that the temperature of the environment where the low-voltage coil 14 is located can be reflected in real time according to the expansion amount of the expansion air bag 197, a detection basis can be provided for the operation protection of the low-voltage coil 14, and accordingly, the operation state of the low-voltage coil 14 is comprehensively evaluated according to the temperature attribute and the electromagnetic moment of the overload current, and corresponding protection measures are taken, specifically:
When the low-voltage coil 14 is not operated for a long time, the low-voltage coil 14 is not subjected to electromagnetic torque and the ambient temperature does not rise, and at this time, the expansion amount of the expansion balloon 197 is 0 and the compression deformation amount of the support spring 196 is 0, which is a state in which the transformer is not put into use after the production and the manufacture are completed or a state in which the transformer is not used after the operation.
Firstly, when the expansion amount of the expansion air bag 197 is smaller than the first temperature threshold, it indicates that the working environment where the low-voltage coil 14 is located is not high, so that the temperature rise range of the low-voltage coil 14 is larger, and therefore the low-voltage coil 14 has better overcurrent bearing capacity.
However, when the compression deformation of the supporting spring 196 is greater than the first compression threshold, it indicates that the current flowing through the low-voltage coil 14 exceeds the rated current value, and the low-voltage coil 14 is in an overload state, so that the temperature of the low-voltage coil 14 gradually increases, the expansion amount of the expansion air bag 197 also gradually increases, and when the expansion amount of the expansion air bag 197 gradually increases to the first temperature threshold, the controller controls the external pump to work, so that the external cooling oil is circulated through the liquid guide tube 17 and the insulated wire sleeve 12, and the heat generated when the low-voltage coil 14 is overloaded is rapidly conducted, so that the heat dissipation effect is improved.
In the process of active circulation cooling, if the expansion amount of the expansion air bag 197 is not reduced and increased, the transformer is indicated to be in an overload load state continuously, when the expansion amount of the expansion air bag 197 reaches a second temperature threshold value, the overload of the low-voltage coil 14 is indicated to generate excessive heat, the expansion of the expansion air bag 197 can drive the induction contact 198 to be in contact with the induction contact 199, the controller directly controls the transformer to trip for power-off protection, meanwhile, the low-voltage coil 14 does not work, however, the external pump continuously works to conduct away the heat generated by the low-voltage coil 14, and overheat protection of the low-voltage coil 14 is realized.
It should be noted that, when the compression deformation amount of the supporting spring 196 reaches the second compression threshold, it indicates that the current value on the low voltage coil 14 has reached the limit value, and the controller directly controls the transformer to trip for power-off protection, so in this state, when the sensing contact 198 and the sensing contact 199 contact or the compression deformation amount of the supporting spring 196 reaches either of the two limit states of the second compression threshold, the controller controls the transformer to power-off for forced protection.
Secondly, when the expansion amount of the expansion air bag 197 is greater than the first temperature threshold, it indicates that the working environment temperature of the low-voltage coil 14 is higher at this time, the controller controls the external pump to continuously operate, so as to complete the cooling operation of the low-voltage coil 14, and at this time, since the low-voltage coil 14 has a high-temperature base, the temperature rising range of the low-voltage coil 14 is smaller, that is, the capability of bearing overload is lower, so that, under the premise and in the continuous working process of the low-voltage coil 14, when the compression deformation amount of the support spring 196 is in a stable state and within the first compression threshold range, it indicates that the low-voltage coil 14 is working normally at this time, however, the working environment temperature of the low-voltage coil 14 is higher, so that the controller controls the cooling operation to continuously proceed, and the heat dissipation is improved until the expansion amount of the expansion air bag 197 is less than the first temperature threshold.
However, when the compression deformation of the supporting spring 196 is greater than the first compression threshold, it indicates that the current flowing through the low-voltage coil 14 exceeds the rated current value, and the low-voltage coil 14 is in an overload state, and a large amount of heat is generated when the low-voltage coil 14 is overloaded, so that the low-voltage coil 14 has a high-temperature base, and in order to avoid accelerated aging of the low-voltage coil 14, the controller directly controls the tripping of the transformer to perform power-off protection when the compression deformation of the supporting spring 196 is greater than the first compression threshold, so as to perform overload protection on the transformer, and the overload protection value of the low-voltage coil 14 can be reduced on the premise that the low-voltage coil 14 is in a high-temperature working environment, so that the working protection on the low-voltage coil 14 is improved.
It should be noted that, because heat is accumulated at the low-voltage coil 14, along with the operation of the low-voltage coil 14, even if the low-voltage coil 14 is not overloaded, heat generated during the operation is accumulated in a short time, so that the expansion air bag 197 is heated and continuously expands and becomes larger on the basis of the first temperature threshold, then when the expansion amount of the expansion air bag 197 reaches the second temperature threshold, the expansion of the expansion air bag 197 drives the induction contact 198 to contact with the induction contact 199, which indicates that the heat generated by the low-voltage coil 14 during the operation without overload is too large, and the heat exchange can not meet the operation requirement by simply relying on flowing cooling oil, at this moment, the controller does not use the contact of the induction contact 198 and the induction contact 199 as signals to execute the power-off operation of the transformer, but controls the operation of the semiconductor refrigeration sheet, so that the cooling oil transmitted in the catheter 17 can be subjected to heat exchange and cooling after the semiconductor refrigeration sheet is cooled, the temperature of the cooling oil can be further reduced, the heat exchanged when the cooling oil flows through the insulation wire sleeve 12 is further increased, and the work protection of the low-voltage coil 14 is completed.
Third embodiment
The invention also provides a winding process of the double-spiral low-voltage coil of the oil-immersed distribution transformer, which comprises the following specific steps:
S1: the coil winding needs to be prepared and molded in advance according to the actual structural composition before being wound;
S2: the ends of the two groups of low-voltage coils 14 are fixed by using self-adhesive tapes, a traction rope is fixed on the self-adhesive tapes, the traction rope penetrates out of the insulated wire sleeve 12, then the two groups of low-voltage coils 14 penetrate through the liquid collecting sleeve 16 and are correspondingly clamped and assembled between the limiting assembly 19 and the two groups of supporting seats 18, and the traction rope is pulled to drive the two groups of low-voltage coils 14 to be spliced and assembled inside the insulated wire sleeve 12;
S3: one ends of the two groups of low-voltage coils 14 are pulled by using a pulling rope, when the low-voltage coils 14 pass through the liquid collecting sleeve 16, sealing rings are installed at the assembling positions of the low-voltage coils 14 and the liquid collecting sleeve 16, and tapping switches 15 are installed at the top ends and the bottom ends of the two groups of low-voltage coils 14, so that the fixed installation of the two groups of low-voltage coils 14 is realized;
S4: uniformly brushing impregnating varnish on the outer side of the iron core 11, sequentially winding and assembling the insulating wire sleeve 12 assembled with the low-voltage coil 14 on the outer side wall of the iron core 11 clockwise, and simultaneously ensuring the close fit between the outer side walls of the insulating wire sleeve 12 until the winding of the iron core 11 is completed;
S5: uniformly brushing impregnating varnish on the outer side wall of the insulating isolation sleeve 13, brushing impregnating varnish on the surface of the insulating wire sleeve 12 after winding is completed, then placing the iron core 11 and the insulating wire sleeve 12 inside the insulating isolation sleeve 13, and sequentially setting to complete the winding work of the first phase coil winding 1, the second phase coil winding 2 and the third phase coil winding 3;
s6: and finally, connecting the tapping switch 15 at the top of the first phase coil winding 1, the second phase coil winding 2 and the third phase coil winding 3 with the head lead copper bar 4, and connecting the tapping switch 15 at the bottom of the first phase coil winding 1, the second phase coil winding 2 and the third phase coil winding 3 with the tail lead copper bar 5.
The length of the iron core 11 is determined according to actual needs, and the actual fixing modes of the iron core 11, the head end lead copper bar 4 and the tail end lead copper bar 5 are not particularly limited, and can be correspondingly set according to specific needs.
Finally, it should be noted that: the foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, 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 described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. The utility model provides an oily formula distribution transformer double helix formula low voltage coil which characterized in that: the coil winding structure comprises a first phase coil winding (1), a second phase coil winding (2) and a third phase coil winding (3) which are identical in structure composition, wherein a head end lead copper bar (4) is arranged above the first phase coil winding (1), the second phase coil winding (2) and the third phase coil winding (3), and a tail end lead copper bar (5) is arranged below the first phase coil winding (1), the second phase coil winding (2) and the third phase coil winding (3);
the first phase coil winding (1) comprises an iron core (11), an insulating wire sleeve (12) is wound and assembled on the outer side of the iron core (11), an insulating isolation sleeve (13) is sleeved and assembled on the outer side of the insulating wire sleeve (12), two groups of low-voltage coils (14) which are arranged in parallel are wound and assembled in parallel in the insulating wire sleeve (12), tapping switches (15) are fixedly assembled at the ends of the two groups of low-voltage coils (14), liquid collecting sleeves (16) which are hermetically assembled on the outer side of the low-voltage coils (14) are fixedly connected at the two ends of the insulating wire sleeve (12), a liquid guide tube (17) is assembled on the liquid collecting sleeve (16) in a communicating mode, a supporting seat (18) which is matched with the low-voltage coils (14) is fixedly arranged on the inner side wall of the insulating wire sleeve (12), and a limiting assembly (19) is assembled between the two groups of low-voltage coils (14);
The outer side wall of the insulating wire sleeve (12) is assembled in a fitting mode and spirally wound on the outer side of the iron core (11), the outer side wall of the insulating wire sleeve (12) is attached to the iron core (11), and a cooling channel is arranged between the outer side wall of the insulating wire sleeve (12) and the inner side wall of the insulating isolation sleeve (13).
2. The oil immersed distribution transformer double-spiral low-voltage coil according to claim 1, wherein: spacing subassembly (19) are including last spacing seat (191), the below opposite direction of going up spacing seat (191) is equipped with spacing seat down (192), go up between spacing seat (191) and the spacing seat down (192) and be connected through bellows (193), be fixed with urceolus (194) on last spacing seat (191) inside wall, be fixed with inner tube (195) on spacing seat (192) inside wall down, inner tube (195) and urceolus (194) grafting movable assembly, the top of inner tube (195) extends to urceolus (194) inner chamber fixedly connected with supporting spring (196), the top of supporting spring (196) is fixed at urceolus (194) inner top.
3. The oil immersed distribution transformer double-spiral low-voltage coil according to claim 2, wherein: an expansion air bag (197) arranged on the inner side of the supporting spring (196) is fixed in the middle of the top of the inner cavity of the outer cylinder (194), a sensing contact (198) is fixedly assembled at the bottom end of the expansion air bag (197), and a sensing contact piece (199) matched with the sensing contact (198) is fixed at the bottom of the inner cavity of the inner cylinder (195).
4. The oil immersed distribution transformer double-spiral low-voltage coil according to claim 2, wherein: the length of the limiting assembly (19) is matched with the low-voltage coil (14), the two groups of supporting seats (18) are symmetrically fixed at the top and the bottom in the insulating wire sleeve (12), and clamping grooves matched with the low-voltage coil (14) are formed in the two groups of supporting seats (18).
5. The oil immersed distribution transformer double-spiral low-voltage coil according to claim 1, wherein: the two groups of low-voltage coils (14) are the same in size, the two groups of low-voltage coils (14) comprise insulation protection sleeves on the outer sides, coil cores are arranged in the insulation protection sleeves, and the intervals between the two groups of low-voltage coils (14) are kept consistent.
6. The oil immersed distribution transformer double-spiral low-voltage coil according to claim 4, wherein: the upper limit seat (191) and the lower limit seat (192) are the same in size, the upper limit seat (191) and the lower limit seat (192) are arc-shaped seats, the upper low-voltage coil (14) is clamped and assembled between the upper limit seat (191) and the upper support seat (18), and the lower low-voltage coil (14) is clamped and assembled between the lower limit seat (192) and the lower support seat (18).
7. The oil immersed distribution transformer double-spiral low-voltage coil according to claim 1, wherein: the liquid collecting sleeve (16) is a rectangular seat, the inside of the liquid collecting sleeve (16) is hollow and is communicated with the inner cavity of the insulating wire sleeve (12), and anti-corrosion layers are sprayed on the inner side walls of the liquid collecting sleeve (16) and the insulating wire sleeve (12).
8. A double-spiral low-voltage coil of an oil-immersed distribution transformer according to claim 3, wherein: the other end of a group of liquid guide pipes (17) at the upper side is connected with an external pump, the induction contact (198) and the induction contact (199) are electrically connected with an external controller through wires, a group of liquid guide pipes (17) at the lower side is connected with an external cooling oil tank, and the external pump is fixedly assembled on the external cooling oil tank.
9. A winding process of a double-spiral low-voltage coil of an oil-immersed distribution transformer, which is used for preparing the double-spiral low-voltage coil of the oil-immersed distribution transformer as claimed in claim 1, and is characterized in that: the specific steps of the winding process are as follows:
S1: the coil winding needs to be prepared and molded in advance according to the actual structural composition before being wound;
S2: the ends of the two groups of low-voltage coils (14) are fixed by using a self-adhesive tape, a traction rope is fixed on the self-adhesive tape, the traction rope penetrates out of the insulated wire sleeve (12), then the two groups of low-voltage coils (14) penetrate through the liquid collecting sleeve (16) and are correspondingly clamped and assembled between the limiting assembly (19) and the two groups of supporting seats (18), and the traction rope is pulled to drive the two groups of low-voltage coils (14) to be spliced and assembled inside the insulated wire sleeve (12);
S3: one ends of the two groups of low-voltage coils (14) are pulled by using a pulling rope, when the low-voltage coils (14) penetrate out of the liquid collecting sleeve (16), sealing rings are installed at the assembling positions of the low-voltage coils (14) and the liquid collecting sleeve (16), and tapping switches (15) are installed at the top ends and the bottom ends of the two groups of low-voltage coils (14), so that the fixed installation of the two groups of low-voltage coils (14) is realized;
S4: uniformly brushing impregnating varnish on the outer side of the iron core (11), sequentially winding and assembling the insulating wire sleeve (12) assembled with the low-voltage coil (14) on the outer side wall of the iron core (11) clockwise, and simultaneously ensuring close fit between the outer side walls of the insulating wire sleeve (12) until the winding of the iron core (11) is completed;
S5: uniformly brushing impregnating varnish on the outer side wall of the insulating isolation sleeve (13), brushing the impregnating varnish on the surface of the insulating wire sleeve (12) after the winding is completed, then placing the iron core (11) and the insulating wire sleeve (12) inside the insulating isolation sleeve (13), and sequentially setting to complete the winding work of the first phase coil winding (1), the second phase coil winding (2) and the third phase coil winding (3);
s6: and finally, connecting a tapping switch (15) at the top of the first phase coil winding (1), the second phase coil winding (2) and the third phase coil winding (3) with a head-end lead copper bar (4), and connecting a tapping switch (15) at the bottom of the first phase coil winding (1), the second phase coil winding (2) and the third phase coil winding (3) with a tail-end lead copper bar (5).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107749339A (en) * | 2017-11-17 | 2018-03-02 | 张银华 | A kind of oil-immersed type non-crystal alloy transformer coil |
| CN109326431A (en) * | 2018-11-05 | 2019-02-12 | 中变集团上海变压器有限公司 | A kind of oil-immersed transformer and its assembly method |
| CN112103042A (en) * | 2020-10-23 | 2020-12-18 | 国网湖南省电力有限公司 | High overload capacity oil-immersed distribution transformer |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107749339A (en) * | 2017-11-17 | 2018-03-02 | 张银华 | A kind of oil-immersed type non-crystal alloy transformer coil |
| CN109326431A (en) * | 2018-11-05 | 2019-02-12 | 中变集团上海变压器有限公司 | A kind of oil-immersed transformer and its assembly method |
| CN112103042A (en) * | 2020-10-23 | 2020-12-18 | 国网湖南省电力有限公司 | High overload capacity oil-immersed distribution transformer |
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