CN221281881U - Winding structure for power transformer and power transformer - Google Patents
Winding structure for power transformer and power transformer Download PDFInfo
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- CN221281881U CN221281881U CN202321982753.8U CN202321982753U CN221281881U CN 221281881 U CN221281881 U CN 221281881U CN 202321982753 U CN202321982753 U CN 202321982753U CN 221281881 U CN221281881 U CN 221281881U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000011111 cardboard Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 abstract 4
- 239000004020 conductor Substances 0.000 description 4
- 239000000123 paper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a winding structure for a power transformer and the power transformer comprising the winding structure, wherein the winding structure comprises a coil assembly, an inner hard insulating cylinder, an outer hard insulating cylinder and a stay assembly, the coil assembly comprises a filtering winding, the filtering winding adopts a cylindrical structure, the inner hard insulating cylinder is attached to the inner side of the coil assembly, the outer hard insulating cylinder is attached to the outer side of the coil assembly, the stay assembly comprises an inner stay unit and an outer stay unit, and the inner stay unit is arranged on the outer wall of the inner hard insulating cylinder and is positioned between the inner hard insulating cylinder and the filtering winding to form an oil gap in the filtering winding; the outer stay unit is disposed between the filter winding and the outer hard insulating cylinder to form an outer oil gap of the filter winding. The winding structure can meet the requirement of stronger short-circuit resistance under the condition that the equivalent short-circuit impedance percentage tends to zero.
Description
Technical Field
The utility model relates to the technical field of transformers, in particular to a winding structure for a power transformer and the power transformer comprising the winding structure.
Background
In the rapid large-scale construction process of the power system in China, in order to avoid the problem that harmonic current generated by nonlinear load flows into a power grid, thereby generating low power quality problems such as low power factor of the power grid, increased harmonic loss and the like, a power transformer with a filter winding structure is generally adopted to solve the problem. For a three-winding transformer, the filter winding is typically arranged between the high-voltage winding and the low-voltage winding, and for a four-winding transformer, the filter winding is typically arranged between the high-voltage winding and the medium-voltage winding.
In order to meet the requirements of the national power grid enterprise standard Q/GDW11476, namely the equivalent short-circuit impedance percentage of the filter winding is close to zero, and the requirements of GB/T1094.5 are also met on the bearing short-circuit capacity, the requirements on the structural type selection and the wire type selection of the filter winding are very high, namely the filter winding is required to have stronger short-circuit resistance under the condition that the equivalent short-circuit impedance percentage is close to zero, and the filter winding in the prior art can not always meet the requirements on the short-circuit resistance under the condition.
In the prior art, a coil with a spiral structure is generally adopted as a filter winding, and an oil gap cushion block is required to be arranged along the height direction of the coil with the spiral structure, so that the height of the coil is increased, and the increase of the height of the coil is not beneficial to reducing the equivalent short-circuit impedance percentage.
Disclosure of utility model
The utility model aims to solve the technical problem of providing a winding structure for a power transformer and the power transformer comprising the winding structure aiming at the defects in the prior art. The winding structure can meet the requirement of stronger short-circuit resistance under the condition that the equivalent short-circuit impedance percentage tends to zero.
In order to solve the problems, the utility model adopts the following technical scheme:
The winding structure for the power transformer comprises a coil assembly, an inner hard insulating cylinder, an outer hard insulating cylinder and a stay assembly, wherein the coil assembly comprises a filter winding, the filter winding adopts a cylindrical structure, the inner hard insulating cylinder is attached to the inner side of the filter winding, the outer hard insulating cylinder is attached to the outer side of the filter winding, the stay assembly comprises an inner stay unit and an outer stay unit, and the inner stay unit is arranged on the outer wall of the inner hard insulating cylinder and is positioned between the inner hard insulating cylinder and the filter winding to form an oil gap in the filter winding; the outer stay unit is disposed between the filter winding and the outer hard insulating cylinder to form an outer oil gap of the filter winding.
Preferably, the inner stay unit includes a plurality of inner stays disposed in parallel along an axial direction of the filter winding, a plurality of the inner stays are disposed at uniform intervals, and the outer stay unit includes a plurality of outer stays disposed in parallel along the axial direction of the filter winding, a plurality of the outer stays are disposed at uniform intervals.
Preferably, the outer stay unit further includes a stay curtain disposed between the filter winding and the outer hard insulating cylinder, and the plurality of outer stays are adhered to the stay curtain and located at a side of the stay curtain close to the filter winding.
Preferably, the filter winding structure further comprises an end ring assembly, the end ring assembly comprises an upper inclined end ring and a lower inclined end ring, the upper inclined end ring is arranged at the top of the filter winding, the lower inclined end ring is arranged at the bottom of the filter winding, and the upper inclined end ring and the lower inclined end ring are arranged between the inner stay unit and the outer stay unit.
Preferably, the end ring assembly further comprises an insulating end ring disposed between the upper diagonal end ring/lower diagonal end ring and the filter winding.
Preferably, the wires in the filter winding are self-adhesive transposed wires.
Preferably, the inner hard insulating cylinder and the outer hard insulating cylinder are made of hard paper boards with the thickness ranging from 4 mm to 6mm.
Preferably, the coil assembly further comprises a low-voltage winding and a high-voltage winding, the filter winding is arranged between the low-voltage winding and the high-voltage winding, the inner hard insulating cylinder is arranged between the low-voltage winding and the filter winding, the outer hard insulating cylinder is arranged between the filter winding and the high-voltage winding, the height of the filter winding is lower than that of the low-voltage winding and that of the high-voltage winding, and the low-voltage winding and the high-voltage winding are both in spiral structures.
Preferably, the coil assembly further comprises a low-voltage winding, a medium-voltage winding and a high-voltage winding, the filter winding is arranged between the medium-voltage winding and the high-voltage winding, the height of the filter winding is lower than that of the low-voltage winding, the high-voltage winding and the medium-voltage winding, the inner hard insulating cylinder is arranged between the medium-voltage winding and the filter winding, the outer hard insulating cylinder is arranged between the filter winding and the high-voltage winding, and the low-voltage winding, the high-voltage winding and the medium-voltage winding are all in spiral structures.
The utility model also provides a power transformer, which comprises an iron core and the winding structure, wherein the winding structure is sleeved on the iron core.
The filter winding of the winding structure adopts a cylindrical coil structure and adopts a self-adhesive transposed conductor, so that the height size of the filter winding can be effectively reduced, the radial size of the filter winding can be increased, and the equivalent short-circuit percentage is zero. And through setting up inside and outside hard insulating cylinder, the cooperation is gone up, lower end circle again, can improve winding structure's short circuit resistance effectively, have higher security to still have the stable structure, the low characteristics of loss.
Drawings
FIG. 1 is an expanded schematic view of a filter winding in embodiment 1 of the present utility model;
fig. 2 is a schematic diagram of the structure of a filter winding in embodiment 1 of the present utility model;
fig. 3 is a schematic diagram of the structure of a power transformer in embodiment 2 of the present utility model.
In the figure: 1-upper oblique end ring, 2-lower oblique end ring, 3-inner hard insulating cylinder, 4-inner stay, 5-outer stay, 6-outer hard insulating cylinder, 7-wire, 8-insulating end ring, 9-coil head, 10-low voltage winding, 11-medium voltage winding, 12-filter winding and 13-high voltage winding.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
In the description of the present utility model, it should be noted that, the terms "upper" and the like indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience and simplicity of description, and do not indicate or imply that the apparatus or element in question must be provided with a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.
The utility model provides a winding structure for a power transformer, which comprises a coil assembly, an inner hard insulating cylinder, an outer hard insulating cylinder and a stay assembly, wherein the coil assembly comprises a filter winding, the filter winding adopts a cylindrical structure, the inner hard insulating cylinder is attached to the inner side of the filter winding, the outer hard insulating cylinder is attached to the outer side of the filter winding, the stay assembly comprises an inner stay unit and an outer stay unit, and the inner stay unit is arranged on the outer wall of the inner hard insulating cylinder and is positioned between the inner hard insulating cylinder and the filter winding so as to form an oil gap in the filter winding; the outer stay unit is disposed between the filter winding and the outer hard insulating cylinder to form an outer oil gap of the filter winding.
The utility model also provides a power transformer, which comprises an iron core and the winding structure, wherein the winding structure is sleeved on the iron core.
Example 1
As shown in fig. 2, the present embodiment discloses a winding structure for a power transformer, including a coil assembly, an inner hard insulating cylinder 3, an outer hard insulating cylinder 6, and a stay assembly, the coil assembly includes a filter winding 12, the filter winding 12 adopts a cylindrical structure (the coil assembly also includes other windings, the other windings all adopt a spiral structure), the inner hard insulating cylinder 3 is attached to the inner side of the filter winding 12, the outer hard insulating cylinder 6 is attached to the outer side of the filter winding 12, the stay assembly includes an inner stay unit and an outer stay unit, the inner stay unit is disposed on the outer wall of the inner hard insulating cylinder 3 and is located between the inner hard insulating cylinder 3 and the filter winding 12 to form an oil gap in the filter winding 12; an outer stay unit is provided between the filter winding 12 and the outer hard insulating cylinder 6 to form an outer oil gap of the filter winding 12.
In the present embodiment, the inner stay unit includes a plurality of inner stays 4 arranged in parallel in the axial direction of the filter winding 12, and the outer stay unit includes a plurality of outer stays 5 arranged in parallel in the axial direction of the filter winding 12. Specifically, the inner stays 4 are evenly spaced, the outer stays 5 are evenly spaced, so that the filter winding 12 is effectively supported, and an inner oil gap and an outer oil gap are respectively formed between the filter winding 12 and the inner stay unit and between the filter winding 12 and the outer stay unit, so that transformer oil can flow in the filter winding 12 conveniently, heat emitted by the filter winding 12 is driven, and the effect of cooling is achieved.
In this embodiment, both inner struts 4 and outer struts 5 are made of cardboard.
In the prior art, the spiral coil is adopted as the filter winding, and oil gap cushion blocks are required to be arranged between wire cakes of the spiral coil, namely, oil gaps of the spiral coil are arranged along the axial direction of the filter winding 12, so that the height dimension of the filter winding 12 is increased, the increase of the height of the filter winding 12 can cause the increase of the equivalent short-circuit impedance percentage, and the equivalent short-circuit impedance percentage of the filter winding 12 cannot be enabled to approach zero.
In this embodiment, the filter winding adopts a cylindrical coil, and the oil gap of the cylindrical coil is disposed on the side surface, so that the height dimension of the filter winding 12 is reduced, and the equivalent short-circuit impedance percentage of the filter winding 12 is enabled to approach zero, so as to meet the requirements of national power grid enterprise standards.
Optionally, the outer stay unit further comprises a stay curtain arranged between the coil assembly and the outer hard insulating cylinder 6, and the plurality of outer stays 5 are adhered to the stay curtain at a side of the stay curtain close to the filter winding 12. Wherein, the stay curtain is made of cardboard with the thickness range of 0.4-0.6 mm. Specifically, the stay curtain is supported by a cardboard of 0.5mm, and the outer stays 5 are uniformly adhered to the stay curtain along the axial interval of the filter winding 12, so that the integrity of the stay curtain is improved, the outer stays 5 are prevented from sliding, and the supporting effect of the outer stays on the filter winding 12 is ensured.
In this embodiment, the filter winding structure further includes an end ring assembly including an upper inclined end ring 1 and a lower inclined end ring 2, the upper inclined end ring 1 is disposed at the top of the filter winding 12, the lower inclined end ring 2 is disposed at the bottom of the filter winding 12, and inclined end faces of the upper inclined end ring 1 and the lower inclined end ring 2 are both close to the cake side, and the upper inclined end ring 1 and the lower inclined end ring 2 are both disposed between the inner stay unit and the outer stay unit and are in close contact with the inner stay unit and the outer stay unit for supporting and binding the filter winding 12. Wherein, upper portion inclined end circle 1 and lower part inclined end circle 2 all adopt the cardboard to make.
Optionally, the end ring assembly further comprises an insulating end ring 8 (formed by bonding equal parts of insulating cushion blocks on the paper ring), and the insulating end ring 8 is arranged between the upper inclined end ring 1/the lower inclined end ring 2 and the filter winding 12 so as to facilitate transformer oil circulation.
In this embodiment, the wires 7 in the filter winding 12 are self-adhesive transposed wires, the wires 7 are continuously wound on the inner stay 4 along the axial direction of the filter winding 12, no oil gap cushion is arranged between wire cakes, and an oil gap in the filter winding 12 is formed through the inner stay 4. The self-adhesive transposed conductor has strong short-circuit resistance, high strength and high hardness, is more suitable for the filter winding in the embodiment, and when the conductor 7 is selected, the wire gauge should select the conductor 7 with a smaller single wire core so as to further improve the short-circuit resistance.
Alternatively, both the inner hard insulating cylinder 3 and the outer hard insulating cylinder 6 are made of cardboard having a thickness in the range of 4 to 6 mm. In this embodiment, the inner and outer hard insulating cylinders 3, 6 are preferably cardboard with a thickness of 5mm, and the filter winding 12 should be placed against the outer stay curtain surface when being nested.
In the present embodiment, in order to adjust the height value of the filter winding 12, a plurality of thick paper turns of 2mm are provided, and the height value of the filter winding 12 is adjusted by placing the thick paper turns between turns of the wire 7.
As shown in fig. 1, the coil heads 9 are axially outgoing lines up and down.
Specifically, for the three-winding transformer, the coil assembly further comprises a low-voltage winding 10 and a high-voltage winding 13, the filter winding 12 is arranged between the low-voltage winding 10 and the high-voltage winding 13, the inner hard insulating cylinder 3 is arranged between the low-voltage winding 10 and the filter winding 12, the outer hard insulating cylinder 6 is arranged between the filter winding 12 and the high-voltage winding 13, the height of the filter winding 12 is lower than that of the low-voltage winding 10 and the high-voltage winding 13 so as to realize that the equivalent short-circuit impedance percentage area tends to zero, and the low-voltage winding 10 and the high-voltage winding 13 both adopt spiral structures.
For a four-winding transformer, the coil assembly includes, in addition to the low-voltage winding 10 and the high-voltage winding 13, the filter winding 12, a medium-voltage winding 11, which is sequentially arranged from inside to outside, the low-voltage winding 10, the medium-voltage winding 11, the filter winding 12, and the high-voltage winding 13. The height of the filter winding 12 is lower than the heights of the low-voltage winding 10, the high-voltage winding 13 and the medium-voltage winding 11 so as to realize that the equivalent short-circuit impedance percentage area tends to zero, and the low-voltage winding, the high-voltage winding and the medium-voltage winding all adopt spiral structures. The inner hard-insulated cylinder 3 is arranged between the medium voltage winding 11 and the filter winding 12, and the outer hard-insulated cylinder 6 is arranged between the filter winding 12 and the high voltage winding 13.
The filter winding 12 of the winding structure in the embodiment adopts a cylindrical coil structure and adopts a self-adhesive transposition wire, so that the height of the filter winding 12 can be effectively reduced, the equivalent short-circuit impedance percentage of the filter winding 12 is enabled to approach zero, the loss of the filter winding structure is low, and the inner and outer hard insulating cylinders 6 and the outer stay curtains are arranged, so that the short-circuit resistance of the filter winding 12 is improved, and the safety of the filter winding is improved; in addition, due to the arrangement of the end ring assembly, the structural stability of the winding structure is effectively improved.
Example 2
The embodiment discloses a power transformer, including iron core and the winding structure in embodiment 1, the winding structure cover is established on the iron core.
As shown in fig. 3, in this embodiment, the power transformer is a 220kV three-phase power transformer, and the coil assembly adopts a four-winding structure, which is respectively as follows: a low voltage winding 10, a medium voltage winding 11, a filter winding 12, a high voltage winding 13. The arrangement sequence of the whole structure is sequentially iron core, low-voltage winding 10, medium-voltage winding 11, filter winding 12 and high-voltage winding 13 from inside to outside. In order to achieve an equal value of the short-circuit impedance percentage zone towards zero, the height of the filter winding 12 is set to be 20-50mm lower than that of the low-voltage winding 10, the medium-voltage winding 11 and the high-voltage winding 13 (specifically adjusted according to the impedance value of the power transformer). The radial value of the filter winding 12 is reasonably set, and is generally 40-60mm.
The power transformer in the embodiment can effectively reduce harmonic loss and improve the power factor of a power grid, and the winding structure in the power transformer has good short circuit resistance, so that the safe and reliable operation of the power transformer is effectively ensured.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.
Claims (10)
1. A winding structure for a power transformer is characterized by comprising a coil assembly, an inner hard insulating cylinder (3), an outer hard insulating cylinder (6), and a stay assembly,
The coil assembly includes a filter winding (12),
The filter winding (12) adopts a cylindrical structure,
The inner hard insulating cylinder (3) is attached to the inner side of the filter winding (12), the outer hard insulating cylinder (6) is attached to the outer side of the filter winding,
The stay assembly comprises an inner stay unit and an outer stay unit, wherein the inner stay unit is arranged on the outer wall of the inner hard insulating cylinder (3) and is positioned between the inner hard insulating cylinder (3) and the filter winding (12) to form an oil gap in the filter winding (12); the outer stay unit is arranged between the filter winding (12) and the outer hard insulating cylinder (6) to form an outer oil gap of the filter winding (12).
2. Winding structure for a power transformer according to claim 1, characterized in that said internal stay unit comprises a plurality of internal stays (4) arranged in parallel in the axial direction of the filter winding (12), a plurality of said internal stays (4) being arranged at uniform intervals,
The outer stay unit comprises a plurality of outer stays (5) which are arranged in parallel along the axial direction of the filter winding (12), and the outer stays (5) are uniformly arranged at intervals.
3. The winding structure for a power transformer according to claim 2, wherein the outer stay unit further comprises a stay curtain,
The stay curtain is arranged between the filter winding (12) and the external hard insulating cylinder (6), and the outer stays (5) are adhered to the stay curtain and are positioned on one surface of the stay curtain, which is close to the filter winding (12).
4. The winding structure for a power transformer according to claim 1, further comprising an end ring assembly,
The end ring assembly comprises an upper inclined end ring (1) and a lower inclined end ring (2),
The upper inclined end ring (1) is arranged at the top of the filter winding (12), the lower inclined end ring (2) is arranged at the bottom of the filter winding (12),
And the upper diagonal end ring (1) and the lower diagonal end ring (2) are both disposed between an inner stay unit and an outer stay unit.
5. The winding structure for a power transformer according to claim 4, wherein the end-ring assembly further comprises an insulating end-ring (8),
The insulating end ring (8) is arranged between the upper inclined end ring (1)/the lower inclined end ring (2) and the filter winding (12).
6. Winding structure for a power transformer according to claim 1, characterized in that the wires (7) in the filter winding (12) are self-adhesive transposed wires.
7. Winding structure for a power transformer according to claim 1, characterized in that the inner hard insulating cylinder (3) and the outer hard insulating cylinder (6) are each made of cardboard with a thickness in the range of 4-6 mm.
8. A winding structure for a power transformer according to any one of claims 1 to 7,
The coil assembly further comprises a low voltage winding (10), a high voltage winding (13), the filter winding (12) is arranged between the low voltage winding (10) and the high voltage winding (13), the inner hard insulating cylinder (3) is arranged between the low voltage winding (10) and the filter winding (12), the outer hard insulating cylinder (6) is arranged between the filter winding (12) and the high voltage winding (13),
The height of the filter winding (12) is lower than the heights of the low-voltage winding (10) and the high-voltage winding (13),
The low-voltage winding (10) and the high-voltage winding (13) are both in spiral structures.
9. A winding structure for a power transformer according to any one of claims 1 to 7,
The coil assembly also comprises a low-voltage winding (10), a medium-voltage winding (11) and a high-voltage winding (13), the filter winding (12) is arranged between the medium-voltage winding (11) and the high-voltage winding (13), the height of the filter winding (12) is lower than the heights of the low-voltage winding (10), the high-voltage winding (13) and the medium-voltage winding (11),
The inner hard insulating cylinder (3) is arranged between the medium-voltage winding (11) and the filter winding (12), the outer hard insulating cylinder (6) is arranged between the filter winding (12) and the high-voltage winding (13), and the low-voltage winding (10), the high-voltage winding (13) and the medium-voltage winding (11) are all in spiral structures.
10. A power transformer comprising an iron core, and further comprising a winding structure according to any one of claims 1-9, said winding structure being sleeved on said iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321982753.8U CN221281881U (en) | 2023-07-26 | 2023-07-26 | Winding structure for power transformer and power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321982753.8U CN221281881U (en) | 2023-07-26 | 2023-07-26 | Winding structure for power transformer and power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221281881U true CN221281881U (en) | 2024-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321982753.8U Active CN221281881U (en) | 2023-07-26 | 2023-07-26 | Winding structure for power transformer and power transformer |
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| Country | Link |
|---|---|
| CN (1) | CN221281881U (en) |
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2023
- 2023-07-26 CN CN202321982753.8U patent/CN221281881U/en active Active
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