CN220232900U - Low-voltage outgoing line structure of power transformer - Google Patents
Low-voltage outgoing line structure of power transformer Download PDFInfo
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- CN220232900U CN220232900U CN202321795363.XU CN202321795363U CN220232900U CN 220232900 U CN220232900 U CN 220232900U CN 202321795363 U CN202321795363 U CN 202321795363U CN 220232900 U CN220232900 U CN 220232900U
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- phase
- copper bar
- tail end
- phase winding
- tail
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 152
- 229910052802 copper Inorganic materials 0.000 claims abstract description 152
- 239000010949 copper Substances 0.000 claims abstract description 152
- 238000004804 winding Methods 0.000 claims abstract description 89
- 230000007935 neutral effect Effects 0.000 claims abstract description 20
- 239000012212 insulator Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Coils Of Transformers For General Uses (AREA)
Abstract
The utility model provides a low-voltage outgoing line structure of a power transformer, which comprises an a-phase winding, a b-phase winding and a c-phase winding which are sequentially arranged in the transformer, wherein the head end of the a-phase winding is connected with an a-phase head end copper bar, the head end of the b-phase winding is connected with a b-phase head end copper bar, the head end of the c-phase winding is connected with a c-phase head end copper bar, the tail end of the b-phase winding is connected with a b-phase tail end copper bar, and the end part of the b-phase tail end copper bar is connected with a neutral line copper bar; the tail end of the a-phase winding is connected with an a-phase tail end copper bar, and the tail end of the c-phase winding is connected with a c-phase tail end copper bar. According to the low-voltage wire outlet structure of the power transformer, the copper bars are respectively arranged at the tail ends of the low-voltage windings, so that the lengths of three-phase lead wires are consistent, the loads of the three-phase coils are more uniform, and the usability of the transformer is improved.
Description
Technical Field
The utility model belongs to the technical field of transformers, and particularly relates to a low-voltage outgoing line structure of a power transformer.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and mainly comprises an iron core, a high-voltage winding and a low-voltage winding which are wound on the iron core, wherein the low-voltage winding can be connected in a star connection mode, the head ends of the low-voltage winding are respectively connected with a head end copper bar of the winding, and the tail ends of the low-voltage winding are commonly connected with a neutral line.
The three-phase transformer can cause unbalanced resistance among output terminals due to unequal inherent lengths of leads of the low-voltage windings, so that the load of the unidirectional coil is overlarge, and the windings are heated seriously. The utility model Chinese patent (application number: 2018209796142) discloses an improved structure for low-voltage outgoing line of an oil-immersed power transformer, which has the technical scheme that: one end of the a-phase coil is an a-phase coil tail head x, the other end of the a-phase coil is an a-phase coil head a, one end of the B-phase coil is a B-phase coil tail head y, the other end of the B-phase coil is a B-phase coil head B, one end of the C-phase coil is a C-phase coil tail head z, the other end of the C-phase coil head C is a C-phase coil head o, the 0-phase terminal o is fixedly connected with the a-phase coil tail head x, the B-phase coil tail head y and the C-phase coil tail head z respectively through star point copper bars, the a-phase coil head a is fixedly connected with the a-phase head wiring terminal A through a-phase connection copper bars, the B-phase coil head B is fixedly connected with the B-phase head wiring terminal B through B-phase connection copper bars, the C-phase coil head C is fixedly connected with the C-phase coil head connecting terminal C through a C-phase connecting copper bar, the length of the C-phase connecting copper bar is shorter than that of the a-phase connecting copper bar, the distances from the a-phase coil head connecting terminal A, B to the 0-phase terminal o from the C-phase coil head connecting terminal B to the C-phase coil head connecting terminal are approximately equal, the problem of unbalanced three-phase direct current resistance can be effectively reduced, the load of the three-phase coil can be more uniform, the probability of overlarge load of the single-phase coil can be reduced, and the service life of the transformer can be prolonged.
However, the lead lengths of the low-voltage windings in the above scheme are still not equal, so that the problem of unbalanced three-phase direct-current resistance still cannot be effectively avoided, and the technical problem is solved by the scheme.
Disclosure of Invention
The utility model aims to provide a low-voltage outgoing line structure of a power transformer, which solves the technical problem of unbalanced three-phase direct-current resistance caused by unequal lead lengths of low-voltage windings.
The low-voltage outgoing line structure of the power transformer comprises an a-phase winding, a b-phase winding and a c-phase winding which are sequentially arranged in the transformer, wherein the head end of the a-phase winding is connected with an a-phase head end copper bar, the head end of the b-phase winding is connected with a b-phase head end copper bar, the head end of the c-phase winding is connected with a c-phase head end copper bar, the tail end of the b-phase winding is connected with a b-phase tail end copper bar, and the end part of the b-phase tail end copper bar is connected with a neutral line copper bar;
an a-phase tail copper bar is connected to the a-phase tail end of the a-phase winding, a c-phase tail copper bar is connected to the c-phase tail end of the c-phase winding, an insulating plate II is arranged between the a-phase tail copper bar and the end part of the c-phase tail copper bar, and an insulating plate I is arranged between the c-phase tail copper bar and the end part of the b-phase tail copper bar;
the copper bar at the tail end of the phase a, the copper bar at the tail end of the insulating plate II, the copper bar at the tail end of the phase c, the copper bar at the tail end of the insulating plate I, the copper bar at the neutral line and the copper bar at the tail end of the phase b are connected through copper bar bolts in sequence.
The lengths of the copper bars at the tail ends of the a phases, the copper bars at the tail ends of the b phases and the copper bars at the tail ends of the c phases are equal.
The bolt holes of the copper bar at the tail end of the phase a, the copper bar at the tail end of the insulating plate II, the copper bar at the tail end of the phase c, the copper bar at the tail end of the insulating plate I, the copper bar at the neutral line and the copper bar at the tail end of the phase b are waist-shaped holes.
The cross sections of the a-phase winding, the b-phase winding and the c-phase winding are elliptical.
The insulating board II is connected with an upper clamping piece of the transformer through an insulator I.
And a limit groove for accommodating the bolt and the nut of the copper bar is formed in the bolt hole of the copper bar at the tail end of the a phase.
The other end of the neutral line copper bar is connected with the upper clamping piece through a second insulator.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The a-phase tail end copper bar is arranged at the tail end of the a-phase winding, the b-phase tail end copper bar is arranged at the tail end of the b-phase winding, the c-phase tail end copper bar is arranged at the tail end of the c-phase winding, the lengths of the a-phase tail end copper bar, the b-phase tail end copper bar and the c-phase tail end copper bar are equal and are sequentially connected through copper bar bolts, the load of the three-phase coil is more uniform, the load of the single-phase coil is more stable, and the service performance of the transformer is improved;
(2) The copper bars at the tail ends of the a phase, the copper bars at the tail ends of the b phase and the copper bars at the tail ends of the c phase are waist-shaped holes, and the lengths of the copper bars at the tail ends of the three-phase windings can be finely adjusted by adjusting the horizontal positions of the copper bar bolts in the waist-shaped holes, so that the occurrence of neutral point displacement of the transformer can be further reduced, the load of the transformer is more stable, and the stability of the transformer is improved;
(3) The cross section of the three-phase winding of the transformer is elliptical, and under the same capacity, the distance between the three-phase winding terminals of the transformer is smaller, so that the copper bar is smaller in use amount, lower in production cost and better in economy of the transformer.
Drawings
Fig. 1 is a schematic view of the overall structure of the present utility model.
FIG. 2 is a schematic diagram of a tail copper bar connection according to the present utility model.
Fig. 3 is a front view of the present utility model.
Fig. 4 is a schematic diagram showing the connection between the tail end of the a-phase winding and the second insulating plate.
Fig. 5 is a schematic diagram showing the connection between the insulating plate II and the insulator I.
Fig. 6 is a schematic view of the neutral copper bar structure of the present utility model.
Wherein, in the figure: 1. a phase winding head end; 11. a phase head end copper bar; 2. b phase winding head end; 21. b phase head end copper bar; 3. c phase winding head end; 31. c, copper bars at the head end of the phase; 4. a phase winding tail end; 5. b phase winding tail end; 6. c phase winding tail end; 7. a copper bar at the tail end of the phase a; 71. a limit groove; 8. b phase tail copper bar; 9. c, copper bars at the tail ends of the phases; 10. a neutral copper bar; 121. an insulator I; 122. an insulator II; 13. an insulating board I; 14. an insulating plate II; 15. copper bar bolts; 16. a phase winding; 17. b phase winding; 18. and c phase windings.
Detailed Description
In order to more clearly describe the technical characteristics of the present solution, the present solution is described below by means of specific embodiments.
Referring to fig. 1-6, a low-voltage outgoing line structure of a power transformer comprises an a-phase winding 16, a b-phase winding 17 and a c-phase winding 18 which are sequentially arranged in the transformer, wherein an a-phase winding head end 1 of the a-phase winding 16 is connected with an a-phase head end copper bar 11, a b-phase winding head end 2 of the b-phase winding 17 is connected with a b-phase head end copper bar 21, a c-phase winding head end 3 of the c-phase winding 18 is connected with a c-phase head end copper bar 31, a b-phase winding tail end 5 of the b-phase winding 17 is connected with a b-phase tail end copper bar 8, and the end part of the b-phase tail end copper bar 8 is connected with a neutral line copper bar 10;
an a-phase winding tail end 4 of the a-phase winding 16 is connected with an a-phase tail end copper bar 7, a c-phase winding tail end 6 of a c-phase winding 18 is connected with a c-phase tail end copper bar 9,a, an insulating plate II 14 is arranged between the ends of the c-phase tail end copper bar 7 and the c-phase tail end copper bar 9, and an insulating plate I13 is arranged between the ends of the c-phase tail end copper bar 9 and the b-phase tail end copper bar 8;
the copper bar 7 at the end of the a phase, the second insulating plate 14, the copper bar 9 at the end of the c phase, the first insulating plate 13, the copper bar 10 at the neutral line and the copper bar 8 at the end of the b phase are connected through copper bar bolts 15 in sequence.
The bolt holes of the copper bar 7 at the end of the a phase, the copper bar 9 at the end of the insulating board II 14, the copper bar 9 at the end of the c phase, the copper bar 13 at the insulating board I, the copper bar 10 at the neutral line and the copper bar 8 at the end of the b phase are waist-shaped holes.
The lengths of the copper bars 7 at the tail end of the a phase, the copper bars 8 at the tail end of the b phase and the copper bars 9 at the tail end of the c phase are equal.
The cross sections of the a-phase winding 16, the b-phase winding 17 and the c-phase winding 18 are elliptical.
The insulating plate II 14 is connected with an upper clamping piece of the transformer through an insulator I121.
The bolt hole of the copper bar 7 at the tail end of the a phase is provided with a limit groove 71 for accommodating the nut of the copper bar bolt 15.
The other end of the neutral copper bar 10 is connected with the upper clamping piece through a second insulator 122.
The a-phase tail end copper bar 7 is arranged at the a-phase winding tail end 4, the b-phase tail end copper bar 8 is arranged at the b-phase winding tail end 5, the c-phase tail end copper bar 9,a is arranged at the c-phase winding tail end 6, the lengths of the b-phase tail end copper bar 8 and the c-phase tail end copper bar 9 are equal and are sequentially connected through the copper bar bolts 15, the load of the three-phase coil is more uniform, the load of the single-phase coil is more stable, and the service performance of the transformer is improved;
the bolt holes on the copper bar 7 at the tail end of the a phase, the copper bar 8 at the tail end of the b phase and the copper bar 9 at the tail end of the c phase are waist-shaped holes, and the lengths of the copper bars at the tail ends of the three-phase windings can be finely adjusted by adjusting the horizontal positions of the copper bar bolts 15 in the waist-shaped holes, so that the neutral point displacement of the transformer can be further reduced, the load of the transformer is more stable, and the stability of the transformer is improved;
the cross section of the three-phase winding of the transformer is elliptical, and the width of the coil is smaller under the same capacity, so that the interval between three-phase terminals of the transformer is smaller, the use amount of copper bars is smaller, the production cost is lower, and the economy of the transformer is better;
in order to reduce electromagnetic interference between the copper bar 7 at the tail end of the a phase, the copper bar 8 at the tail end of the b phase, the copper bar 9 at the tail end of the c phase and the copper bar 10 of the neutral line, shielding layers can be coated on the side parts of the copper bars, in order to ensure the connection effect between the copper bar 7 at the tail end of the a phase, the copper bar 8 at the tail end of the b phase, the copper bar 9 at the tail end of the c phase and the copper bar 10 of the neutral line, the copper bar bolt 15 is made of a material with good electrical conductivity, and measures such as adding a gasket between the copper bar bolt 15 and the copper bar, welding after fastening the copper bar bolt 15 are adopted, so that the direct current resistance and the insulation resistance of the transformer meet the requirements.
The technical features of the present utility model that are not described in the present utility model may be implemented by or using the prior art, and are not described in detail herein, but the above description is not intended to limit the present utility model, and the present utility model is not limited to the above examples, but is also intended to be within the scope of the present utility model by those skilled in the art.
Claims (7)
1. The utility model provides a low-voltage outgoing line structure of power transformer, includes a phase winding (16), b phase winding (17), c phase winding (18) that set gradually in the transformer, a phase winding head end (1) of a phase winding (16) is connected with a phase head end copper bar (11), b phase winding head end (2) of b phase winding (17) are connected with b phase head end copper bar (21), c phase winding head end (3) of c phase winding (18) are connected with c phase head end copper bar (31), characterized in that, b phase winding tail end (5) of b phase winding (17) are connected with b phase tail end copper bar (8), the end connection of b phase tail end copper bar (8) has neutral line copper bar (10);
an a-phase winding tail end (4) of the a-phase winding (16) is connected with an a-phase tail end copper bar (7), a c-phase winding tail end (6) of the c-phase winding (18) is connected with a c-phase tail end copper bar (9), an insulating board II (14) is arranged between the a-phase tail end copper bar (7) and the end part of the c-phase tail end copper bar (9), and an insulating board I (13) is arranged between the c-phase tail end copper bar (9) and the end part of the b-phase tail end copper bar (8);
the copper bar (7) at the tail end of the phase a, the copper bar (9) at the tail end of the phase c, the copper bar (13) at the tail end of the phase c, the copper bar (10) at the neutral line and the copper bar (8) at the tail end of the phase b are sequentially connected through copper bar bolts (15).
2. The low-voltage outlet structure of the power transformer according to claim 1, wherein bolt holes of the a-phase tail copper bar (7), the insulating plate two (14), the c-phase tail copper bar (9), the insulating plate one (13), the neutral line copper bar (10) and the b-phase tail copper bar (8) are waist-shaped holes.
3. The low-voltage outlet structure of a power transformer according to claim 1, characterized in that the lengths of the a-phase tail copper bar (7), the b-phase tail copper bar (8) and the c-phase tail copper bar (9) are equal.
4. A low voltage outlet structure of a power transformer according to claim 1, characterized in that the cross sections of the a-phase winding (16), the b-phase winding (17) and the c-phase winding (18) are elliptical.
5. The low-voltage outlet structure of a power transformer according to claim 1, characterized in that the insulating plate two (14) is connected with the upper clamping piece of the transformer through an insulator one (121).
6. The low-voltage outlet structure of the power transformer according to claim 2, characterized in that the bolt hole of the a-phase tail copper bar (7) is provided with a limit groove (71) for accommodating the nut of the copper bar bolt (15).
7. The low-voltage outlet structure of the power transformer according to claim 1, wherein the other end of the neutral wire copper bar (10) is connected with the upper clamping piece through an insulator II (122).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321795363.XU CN220232900U (en) | 2023-07-10 | 2023-07-10 | Low-voltage outgoing line structure of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321795363.XU CN220232900U (en) | 2023-07-10 | 2023-07-10 | Low-voltage outgoing line structure of power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220232900U true CN220232900U (en) | 2023-12-22 |
Family
ID=89181131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321795363.XU Active CN220232900U (en) | 2023-07-10 | 2023-07-10 | Low-voltage outgoing line structure of power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220232900U (en) |
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2023
- 2023-07-10 CN CN202321795363.XU patent/CN220232900U/en active Active
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