CN215342246U - Split transformer - Google Patents
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- CN215342246U CN215342246U CN202121370001.7U CN202121370001U CN215342246U CN 215342246 U CN215342246 U CN 215342246U CN 202121370001 U CN202121370001 U CN 202121370001U CN 215342246 U CN215342246 U CN 215342246U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 235000012771 pancakes Nutrition 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000011888 foil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
An embodiment of the present invention provides a split transformer, including: the transformer comprises an iron core, a primary coil and at least two secondary coils which are connected in parallel; the primary coil is arranged between the iron core and the at least two secondary coils, and the at least two secondary coils are arranged in parallel along the axis direction of the iron core; the primary coil comprises an inner coil and an outer coil which are mutually connected in series, and the inner coil is positioned between the outer coil and the iron core; the height of the outer coil is the same as the total height of the at least two secondary coils along the axial direction of the iron core, and the height of the inner coil is smaller than or equal to that of the outer coil; the inner-layer coil comprises at least two taps, wherein the running turns corresponding to the at least two taps are different. Through the arrangement mode of the inner coil and the outer coil, the primary coil and the secondary coil are kept in ampere-turn balance when the primary coil is in different voltage regulating gears, and eddy current loss is prevented from increasing.
Description
Technical Field
The utility model relates to the technical field of electricity, in particular to a split type transformer.
Background
The transformer changes alternating voltage by utilizing the principle of electromagnetic induction, is basic equipment for power transmission and distribution, and is widely applied to the fields of industry, agriculture, traffic, urban communities and the like. A split transformer is a multi-coil power transformer consisting of one primary coil and multiple secondary coils per phase. A single primary coil in the split transformer is simultaneously coupled with a plurality of split secondary coils, and the secondary coils simultaneously supply power to a load. In the conventional split transformer, a plurality of split secondary coils corresponding to a primary coil are located at different axial height positions of the primary coil. Due to the special split secondary coil structure, the ampere-turn balance degree of the primary coil and the secondary coil cannot be good, and the consequence is that the ampere-turn between the primary coil and the secondary coil is unbalanced, and the eddy current loss of each coil is obviously increased in a distorted leakage magnetic field. For example, in the case of a phase-shifting transformer, the unbalance of the eddy current loss between three groups of secondary coils can reach 80% at most.
At present, the mode of improving eddy current loss increase caused by unbalanced ampere turns of split transformers is to adopt a cake-shaped structure for a primary coil to match a secondary coil. However, the number of turns of the primary coil of the transformer is adjustable, so that the secondary voltage is kept stable by adjusting the number of turns of the primary coil when the power grid fluctuates. Therefore, the method can only lead the primary coil and the secondary coil to achieve ampere-turn balance on individual voltage regulating gears, improve the leakage magnetic field and reduce the eddy current loss. However, due to the requirements of different voltage regulating gears, ampere-turn imbalance always exists between the primary coil and the secondary coil, and eddy current loss is increased.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a split transformer, which at least partially solves the above technical problems.
To achieve the above object, an embodiment of the present invention provides a split transformer, including: the transformer comprises an iron core, a primary coil and at least two secondary coils which are connected in parallel; the primary coil is arranged between the iron core and the at least two secondary coils, and the at least two secondary coils are arranged in parallel along the axis direction of the iron core; the primary coil comprises an inner coil and an outer coil which are mutually connected in series, and the inner coil is positioned between the outer coil and the iron core; the height of the outer coil is the same as the total height of the at least two secondary coils along the axial direction of the iron core, and the height of the inner coil is smaller than or equal to that of the outer coil; the inner-layer coil comprises at least two taps, wherein the running turns corresponding to the at least two taps are different.
In the split transformer provided by the embodiment of the utility model, the primary coil is divided into the inner coil and the outer coil which are mutually connected in series, and the height of the outer coil is the same as the total height of the secondary coil, so that ampere-turn balance is realized between the outer coil and the secondary coil. The inlayer coil includes that two at least take a percentage, can adjust the gear of primary coil, simultaneously because the highly be less than or equal to the height of outer coil of inlayer coil, inlayer coil can not produce the leakage magnetic field, and the gear of adjusting primary coil through inlayer coil can not destroy the ampere-turn balance between outer coil and the secondary coil. Therefore, through the arrangement mode of the inner coil and the outer coil, the split transformer can realize that the primary coil and the secondary coil always keep ampere-turn balance when in different voltage regulating gears, and avoid the increase of eddy current loss.
In another implementation of the utility model, the outer layer coil is a wire-wound pancake coil.
In this implementation, the ampere-turn balance between the outer coil and the secondary coil can be better achieved because the wire-wound pancake coil provides easier height control.
In another implementation of the utility model, the outer coil comprises at least two coil segments connected in series with each other; the at least two coil sections are arranged in parallel along the axial direction of the iron core; along the axis direction of the iron core, each coil section corresponds to one secondary coil, and different coil sections correspond to different secondary coils.
In the implementation mode, the coil sections of the outer-layer coil correspond to the secondary coils one by one, and the ampere-turn balance degree is higher.
In another implementation manner of the present invention, in the axial direction of the iron core, the height of each coil segment is the same as the height of the corresponding secondary coil, and the distance between adjacent coil segments is equal to the distance between adjacent secondary coils.
In the implementation mode, the height of the coil section of the outer coil and the interval between the coil sections correspond to those of the secondary coils, so that the magnetic field leakage between the outer coil and the secondary coils caused by the interval between the adjacent secondary coils can be avoided, and the ampere-turn balance between the outer coil and the secondary coils is further ensured.
In a further embodiment of the utility model, the number of coil segments is three.
In the implementation mode, the number of the coil sections of the outer-layer coil is three, the number of the secondary coils is also three, the split transformer is compact in structure, and power can be supplied to three loads at the same time.
In another implementation of the utility model, the inner coil is a foil-wound coil.
In the implementation mode, the foil winding layer type coils can be distributed in the height direction of the iron core more uniformly, the number of turns can be adjusted conveniently, and the phenomenon that the ampere-turn balance between the outer layer coil and the secondary coil is influenced by excessive concentration of the magnetic potential of the inner layer coil is avoided.
In another implementation of the present invention, the midpoint of the inner coil and the midpoint of the outer coil are located at the same height in the axial direction of the core.
In this kind of realization, the inlayer coil is located the middle part of iron core height, the insulating problem of foil formula layer coil of can better solution to further avoid the inlayer coil to the balanced influence of ampere turn between outer coil and the secondary coil.
In another implementation manner of the present invention, the number of turns of the outer coil is 95% of the number of turns corresponding to the rated voltage of the split transformer, and the number of turns of the inner coil is 10% of the number of turns corresponding to the rated voltage of the split transformer.
In this implementation, the primary coil can be adjusted between +/-5%, ensuring the stabilization of the secondary voltage in case of grid fluctuations.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and it is also possible for a person skilled in the art to obtain other drawings based on these drawings.
Fig. 1 is a schematic partial cross-sectional view of a split transformer provided by an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a split transformer provided by an embodiment of the present invention;
fig. 3 is a schematic partial cross-sectional view of a split transformer provided by an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a split transformer according to an embodiment of the present invention.
List of reference numerals:
110: an iron core; 120: a primary coil; 121: an inner coil; 122: an outer coil; 1220: a coil segment; and 130: and a secondary coil.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention shall fall within the scope of the protection of the embodiments of the present invention.
Referring to fig. 1-2, where fig. 1 shows a single-phase structure of a split transformer, and fig. 2 shows a three-phase structure corresponding to fig. 1, an embodiment of the present invention provides a split transformer, including: an iron core 110, a primary coil 120, and at least two secondary coils 130 connected in parallel with each other; the primary coil 120 is disposed between the core 110 and at least two secondary coils 130, and the at least two secondary coils 130 are disposed in parallel along the axial direction of the core 110; the primary coil 120 includes an inner coil 121 and an outer coil 122 connected in series with each other, the inner coil 121 being located between the outer coil 122 and the core 110; the height of the outer coil 122 is the same as the total height of the at least two secondary coils 130 along the axial direction of the core 110, and the height of the inner coil 121 is less than or equal to the height of the outer coil 122; the inner coil 121 includes at least two taps, wherein the at least two taps have different numbers of turns of operation.
In the split transformer provided by the embodiment of the present invention, the primary coil 120 is divided into the inner coil 121 and the outer coil 122 which are connected in series, and the height of the outer coil 122 is the same as the total height of the secondary coil 130, so that the ampere-turn balance between the outer coil 122 and the secondary coil 130 is realized. Inner coil 121 includes two at least taps, can adjust primary coil 120's gear, simultaneously because inner coil 121's height is less than or equal to outer coil 122's height, inner coil 121 can not produce the leakage magnetic field, and the gear of adjusting primary coil 120 through inner coil 121 can not destroy the ampere-turn balance between outer coil 122 and secondary coil 130. Therefore, by the arrangement of the inner coil 121 and the outer coil 122, the split transformer can keep ampere-turn balance between the primary coil 120 and the secondary coil 130 at different voltage-regulating gears, and avoid increase of eddy current loss.
In another implementation of the utility model, the outer coil 122 is a wire-wound pancake coil.
In this implementation, since the wire-wound pancake coil has easier height control, the height of the outer coil 122 and the total height of the secondary coil 130 can be better matched, and thus the ampere-turn balance between the outer coil 122 and the secondary coil 130 can be better achieved.
Referring to fig. 3-4, wherein fig. 3 illustrates a single-phase structure of yet another split transformer, and fig. 4 illustrates a three-phase structure corresponding to fig. 3, in another implementation of the present invention, the outer coil 122 includes at least two coil segments 1220 connected in series with each other; at least two coil segments 1220 are arranged in parallel along the axial direction of the core 110; each coil segment 1220 corresponds to one secondary coil 130, and different coil segments 1220 correspond to different secondary coils 130 in the axial direction of the core 110.
In this implementation, the coil segments 1220 of the outer coil 122 and the secondary coils 130 are in one-to-one correspondence, and the ampere-turn balance is higher.
In another implementation of the present invention, the height of each coil segment 1220 is the same as the height of the corresponding secondary coil 130 in the axial direction of the core 110, and the distance between adjacent coil segments 1220 is equal to the distance between adjacent secondary coils 130.
In this implementation, the height of the coil segment 1220 of the outer coil 122 and the interval between the coil segments 1220 correspond to the secondary coil 130, so that the leakage of the magnetic field between the outer coil 122 and the secondary coil 130 due to the interval between the adjacent secondary coils 130 can be avoided, and the ampere-turn balance between the outer coil 122 and the secondary coil 130 can be further ensured.
In another implementation of the present invention, the number of coil segments 1220 is three.
In this implementation, the number of the coil segments 1220 of the outer coil 122 is three, and the number of the secondary coils 130 is also three, so that the split transformer has a compact structure, and can simultaneously supply power to three loads.
In another implementation of the present invention, the inner coil 121 is a foil-wound coil.
In this implementation, the foil-wound layer coils can be more uniformly distributed in the height direction of the iron core 110, which is beneficial to adjusting the number of turns, and avoids the magnetic potential of the inner layer coil 121 from being excessively concentrated to influence the ampere-turn balance between the outer layer coil 122 and the secondary coil 130.
In another implementation of the present invention, the middle point of the inner coil 121 and the middle point of the outer coil 122 are located at the same height in the axial direction of the core 110.
In this implementation, the inner coil 121 is located in the middle of the height of the iron core 110, so that the insulation problem of the foil-type layer-wound coil can be better solved, and the influence of the inner coil 121 on the ampere-turn balance between the outer coil 122 and the secondary coil 130 is further avoided.
In another implementation of the present invention, the number of turns of the outer coil 122 is 95% of the number of turns of the split transformer corresponding to the rated voltage, and the number of turns of the inner coil 121 is 10% of the number of turns of the split transformer corresponding to the rated voltage.
When the power grid fluctuates, in order to keep the secondary voltage stable, the number of turns of the primary coil of the transformer needs to be adjusted, i.e. the gear is adjusted. The standard specifies a range of variation of +/-5%, i.e., 95% to 105%. In this implementation, the outer coil 122 is always kept running, the inner coil 121 selects the number of running turns as required, and finally, the number of turns of the primary coil 120 is adjusted to +/-5% of the number of turns corresponding to the rated voltage, so that the stability of the secondary voltage is ensured when the power grid fluctuates.
The above embodiments and implementations are merely specific illustrations of possible embodiments of the utility model, and should not be construed as limiting the scope of the utility model. All equivalents and modifications of the technical spirit of the present invention, such as division and rearrangement of features, are included in the scope of the present invention.
Claims (8)
1. A split transformer, comprising: an iron core (110), a primary coil (120), and at least two secondary coils (130) connected in parallel with each other;
the primary coil (120) is arranged between the iron core (110) and the at least two secondary coils (130), and the at least two secondary coils (130) are arranged in parallel along the axial direction of the iron core (110);
the primary coil (120) comprises an inner coil (121) and an outer coil (122) which are connected in series, wherein the inner coil (121) is positioned between the outer coil (122) and the iron core (110);
the height of the outer coil (122) is the same as the total height of the at least two secondary coils (130) along the axial direction of the iron core (110), and the height of the inner coil (121) is less than or equal to the height of the outer coil (122);
the inner coil (121) comprises at least two taps, wherein the at least two taps have different numbers of running turns.
2. The split transformer of claim 1, wherein the outer coil (122) is a wire wound pancake coil.
3. The split transformer of claim 2, wherein the outer coil (122) comprises at least two coil segments (1220) connected in series with each other; the at least two coil segments (1220) are arranged in parallel along the axial direction of the iron core (110); in the axial direction of the iron core (110), each of the coil segments (1220) corresponds to one of the secondary coils (130), and different ones of the coil segments correspond to different ones of the secondary coils (130).
4. The split transformer of claim 3, wherein a height of each coil segment (1220) is the same as a height of the corresponding secondary coil (130) in an axial direction of the core (110), and a distance between adjacent coil segments (1220) is equal to a distance between adjacent secondary coils (130).
5. The split transformer of claim 3, wherein the number of coil segments (1220) is three.
6. The split transformer of claim 1, wherein the inner coil (121) is a foil-wound layered coil.
7. The split transformer according to claim 1, wherein a midpoint of the inner coil (121) and a midpoint of the outer coil (122) are located at the same height in an axial direction of the core (110).
8. The split transformer according to any one of claims 1 to 7, wherein the outer coil (122) has 95% turns and the inner coil (121) has 10% turns of the split transformer corresponding to the rated voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121370001.7U CN215342246U (en) | 2021-06-16 | 2021-06-16 | Split transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121370001.7U CN215342246U (en) | 2021-06-16 | 2021-06-16 | Split transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215342246U true CN215342246U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121370001.7U Active CN215342246U (en) | 2021-06-16 | 2021-06-16 | Split transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215342246U (en) |
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2021
- 2021-06-16 CN CN202121370001.7U patent/CN215342246U/en active Active
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| CP03 | Change of name, title or address |
Address after: 200137 No.460, Gaoxiang Ring Road, Gaodong Industrial Park, Pudong New Area, Shanghai Patentee after: Yinmengda (Shanghai) Electrical Transmission Equipment Co.,Ltd. Country or region after: China Address before: 200137 No.460, Gaoxiang Ring Road, Gaodong Industrial Park, Pudong New Area, Shanghai Patentee before: SIEMENS ELECTRICAL DRIVES (SHANGHAI) Ltd. Country or region before: China |