CN202796399U - Transformer with balance coil - Google Patents
Transformer with balance coil Download PDFInfo
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- CN202796399U CN202796399U CN 201220422783 CN201220422783U CN202796399U CN 202796399 U CN202796399 U CN 202796399U CN 201220422783 CN201220422783 CN 201220422783 CN 201220422783 U CN201220422783 U CN 201220422783U CN 202796399 U CN202796399 U CN 202796399U
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- balance
- stem
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Abstract
The utility model relates to a transformer with a balance coil. The transformer comprises an iron core with an inner iron structure, wherein the iron core is provided with at least one core column and a plurality of coils concentrically surrounding the core column; and the coils include a low-voltage coil, a high-voltage coil and a balance coil in sequence from the core column along the radial direction. Through the arrangement, short-circuit radial force acting on the balance coil is changed into tensile force. The sizes of the high-voltage coil and the low-voltage coil can be reduced, so that the size of the entire transformer is reduced, and the short-circuit resistance of the balance coil can be improved effectively.
Description
Technical field
The utility model relates to a kind of transformer, relates in particular to a kind of transformer with balance coil.
Background technology
In electrical network, the voltage of long-distance transmissions is usually very high, 1100KV-220KV for example, and the voltage ratio that user side need to use is lower, 220V for example, this just need to connect the conversion operations that various step-down transformers carry out each step voltage in electrical network, high-tension electricity is converted to the low tension that the user can use.And for example in the power plant, low tension need to be converted to high-tension electricity in some occasions that need to boost, therefore need to use step-up transformer.
Because the load in the electrical network is dynamic change, transformer as grid nodes may be operated in the unbalanced operation state, is the transformer of Y-connection for high-low pressure, owing to there is not the zero sequence impedance loop, three times and multiple reflection voltage are very high, and the neutral point current potential is also unstable.For this reason, usually can be designed with balance coil in this type of transformer, it has been increased the reliability of transformer-supplied so that output voltage stablizes.
Such transformer is for example existing open in US4020438A.Wherein, each coil is layout as follows: on iron core 20, what adjacent iron core twined is balance coil 12, what next-door neighbour's balance coil 12 twined is low-voltage coil 14, with the adjacent winding of low-voltage coil be high-tension coil 16, what be positioned at the high-tension coil outside is voltage regulation coil 18, and namely balance coil is positioned at penetralia for the iron core that twines (namely along radial).
In the design shown in the US4020438A, short-circuit force can become the bottleneck of design balance coil.It is less to be positioned at the impedance when transformer short-circuit of inner most balance coil, and electric current is large, causes this balance coil to be subject to the diametral force of very large inside compression, need to satisfy anti-short circuit capability by increasing the modes such as wire hardness and the radial size of coil.The corresponding increase production difficulty of this meeting increases product weight and size.The simultaneously balance coil damage that easily deforms affects its function in transformer.
The utility model content
Therefore, the purpose of this utility model is to provide a kind of improved transformer that can overcome the defective of above-mentioned transformer of the prior art, and it is so that anti-short circuit capability improves overall weight and the size of also having dwindled transformer simultaneously.
Above-mentioned purpose is to realize that by a kind of like this transformer with balance coil it comprises: have the iron core of interior iron formula structure, described iron core has at least one stem stem, and a plurality of coils that surround with one heart described stem stem.Described a plurality of coil from described stem stem along radial low-voltage coil, high-tension coil and the balance coil of being followed successively by.
Preferably, described a plurality of coils also comprise the voltage regulation coil for the regulation voltage fluctuation, and described voltage regulation coil is along the radial described balance coil outside that is positioned at.
Preferably, described voltage regulation coil is electrically connected with described high-tension coil or is electrically connected with described low-voltage coil.
Preferably, described a plurality of coils also comprise intermediate voltage winding, and described intermediate voltage winding is Y-connection, and along radial between described low-voltage coil and described high-tension coil.
Preferably, described transformer is three-phase transformer or Single Phase Transformer Set, the connection triangular in shape of described balance coil, and described high-tension coil and described low-voltage coil are Y-connection.
Preferably, described transformer is oil-filled transformer.
Preferably, described iron core is three pillar type iron core or five column iron core.
Preferably, the cross section of described stem stem is square, circular, ellipse or polygon.
Preferably, described a plurality of coil is made by copper conductor.
In transformer of the present utility model, each coil is arranged so that with particular order balance coil can be positioned at the high-tension coil outside, perhaps has in the situation of voltage regulation coil between high-tension coil and voltage regulation coil.
By such setting, the radial short-circuit force that acts on the balance coil will be tensile force.In addition, the size of each coil can reduce, thus so that the size decreases of whole transformer.And for balance coil, its ability of bearing short circuit can effectively improve.
Description of drawings
Above-mentioned and other advantages of the present utility model and feature will become more clear after the description to embodiment by reference to the accompanying drawings, wherein:
Fig. 1 is the schematic layout pattern according to a kind of embodiment of transformer of the present utility model;
Fig. 2 is the schematic layout pattern according to another embodiment of transformer of the present utility model;
Fig. 3 is the again schematic layout pattern of an embodiment according to transformer of the present utility model;
Fig. 4 is the schematic layout pattern according to the another embodiment of transformer of the present utility model.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing, wherein the identical identical parts of reference number representative.Accompanying drawing is not to draw in proportion, and some part has been carried out exaggerative more to clearly illustrate structure of the present utility model.
In the following embodiments, will transformer of the present utility model be described as an example of the large oil immersed formula transformer that is used for electrical network example, especially the coil layout of this transformer.But these embodiment only are exemplary, do not really want the utility model is limited.On the contrary, the transformer that has a layout of iron-core coil shown in the utility model also can be for large-scale or small-sized, the dry type of other occasions or oil-filled transformer.
Balance coil in the transformer can play following effect: for triple-frequency harmonics provides low impedance path; When threephase load was uneven, balance coil can weaken unsymmetrical current to the feedback of electrical network; For the power station provides accessory power supply; Terminal industrial cousumer can connect compensation and filter apparatus at balance coil, reduces feed back to electrical network humorous and involves idle.
In the past, nobody paid close attention to the position of balance coil to the impact of its effect of bringing into play.Key of the present utility model has been to change the position of balance coil, has obtained the effect that is highly profitable.Therefore, the below focuses on that coil comes transformer of the present utility model is described with respect to the layout of iron core.
Be illustrated in figure 1 as the cross-sectional schematic of a transformer part of the present utility model.Because improvements of the present utility model mainly are the winding order of its coil on iron core, therefore only show the part of the iron core of this transformer, wherein the stem stem of iron core is in the drawings with reference number 30 expressions.In transformer of the present utility model, iron core can be C shaped iron core, double C-type iron core or other patterns, can be three pillar type iron core or five column iron core.Only show the part of a stem stem 30 among Fig. 1 with exemplary approach, the structure of other stem stems can be similar or be equal to.
Be close to this stem stem 30 and be wound with low-voltage coil 1, this low-voltage coil 1 decides around the number of turn of stem stem 30 design parameter by transformer.At the radial outside place of low-voltage coil 1, be adjacent to be furnished with high-tension coil 2 with low-voltage coil 1, high-tension coil 2 centers on low-voltage coil 1 thereby also twines with one heart around stem stem 30.The number of turn of high-tension coil 2 is also decided by the design parameter of transformer.At the radial outside place of high-tension coil 3, be adjacent to be furnished with balance coil 3 with high-tension coil 2, balance coil 3 centers on high-tension coil 2, thereby also twines with one heart around low-voltage coil 1 and stem stem 30.
As shown in Figure 2, as required, can be at the radial outside place of balance coil 3, around balance coil 3 thereby also twine with one heart voltage regulation coil 4 around high-tension coil 2, low-voltage coil 1 and stem stem 30.Be very useful when the relatively frequent or fluctuation ratio of voltage regulation coil 4 voltage fluctuation in electrical network is larger, be conducive to keep the stable of voltage.
In the situation of using voltage regulation coil 4, this voltage regulation coil 4 can be electrically connected that the high-pressure side is regulated with high-tension coil 2, also can be electrically connected that low-pressure side is regulated with low-voltage coil 1.
On radial, can have certain gap between low-voltage coil 1, high-tension coil 2, the balance coil 3, so that cooling and insulation.
As shown in Figure 3 and Figure 4, as required, transformer of the present utility model can also comprise intermediate voltage winding 5, and described intermediate voltage winding 5 is Y-connection, and along radial between low-voltage coil 1 and high-tension coil 2.
The mode of connection between each coil of this transformer can with traditional transformer in identical.For example in three-phase transformer or Single Phase Transformer Set, high-tension coil 2 and low-voltage coil 1 are Y-connection, balance coil 3 connections triangular in shape.When needed, balance coil 3 also can link to each other with load equipment.The turn ratio of the utility model transformer can arrange according to the difference of application scenario.Each coil can be entwined by the copper cash that is coated with insulating material.
By said structure, so that each coil is from stem stem 30 beginning from the inside to the outside by being disposed in order of low-voltage coil, high-tension coil, balance coil and optional voltage regulation coil, the advantage of generation is like this:
By the balance coil in the traditional transformer loop construction is moved outside radial, so that the impedance of coil becomes large, anti-short circuit capability is also strengthened, and balance coil only is subject to the tensile force on radial, has increased its job stability.In addition, because low-voltage coil 1 and high-tension coil 2 move in radial, so that the structure of whole core-coil assembly diminishes, thereby saved wire, and also reduced the overall dimensions of transformer.Simultaneously, also corresponding reducing of the loss of electric energy.In addition, because the inner space of transformer can be utilized better, it has saved cost.
Herein, radial outwards, along radially being positioned at the outside, along radial outside, moving and all refer to away from stem stem 30, otherwise then be close stem stem 30.
The utility model is described with reference to the accompanying drawings, but the utility model is not limited to the above embodiments, and one or more features of above-described embodiment can make up on demand, and final scope of the present utility model is limited by claims.
Claims (9)
1. transformer with balance coil comprises:
Iron core with interior iron formula structure, described iron core have at least one stem stem (30); And
Surround with one heart a plurality of coils of described stem stem (30),
It is characterized in that,
Described a plurality of coil from described stem stem (30) along radial low-voltage coil (1), high-tension coil (2) and the balance coil (3) of being followed successively by.
2. transformer as claimed in claim 1 is characterized in that, described a plurality of coils also comprise the voltage regulation coil (4) for the regulation voltage fluctuation, and described voltage regulation coil (4) is along radial described balance coil (3) outside that is positioned at.
3. transformer as claimed in claim 2 is characterized in that, described voltage regulation coil (4) is electrically connected with described high-tension coil (2) or is electrically connected with described low-voltage coil (1).
4. transformer as claimed in claim 1 is characterized in that, described a plurality of coils also comprise intermediate voltage winding (5), and described intermediate voltage winding (5) is Y-connection, and is positioned between described low-voltage coil (1) and the described high-tension coil (2) along radial.
5. transformer as claimed in claim 1 is characterized in that, described transformer is three-phase transformer or Single Phase Transformer Set, described balance coil (3) connection triangular in shape, and described high-tension coil (2) and described low-voltage coil (1) are Y-connection.
6. transformer as claimed in claim 1 is characterized in that, described transformer is oil-filled transformer.
7. transformer as claimed in claim 1 is characterized in that, described iron core is three pillar type iron core or five column iron core.
8. transformer as claimed in claim 1 is characterized in that, the cross section of described stem stem (30) is square, circular, ellipse or polygon.
9. transformer as claimed in claim 1 is characterized in that, described a plurality of coils are made by copper conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220422783 CN202796399U (en) | 2012-08-23 | 2012-08-23 | Transformer with balance coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220422783 CN202796399U (en) | 2012-08-23 | 2012-08-23 | Transformer with balance coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202796399U true CN202796399U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220422783 Expired - Fee Related CN202796399U (en) | 2012-08-23 | 2012-08-23 | Transformer with balance coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202796399U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103594235A (en) * | 2013-12-02 | 2014-02-19 | 中电电气(江苏)股份有限公司 | Winding structure of transformer |
| CN103606437A (en) * | 2013-12-04 | 2014-02-26 | 正泰电气股份有限公司 | Winding distribution mode of power transformer with balancing windings |
| CN107068364A (en) * | 2017-04-25 | 2017-08-18 | 国家电网公司 | It is a kind of to balance the power transformer of winding outside |
-
2012
- 2012-08-23 CN CN 201220422783 patent/CN202796399U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103594235A (en) * | 2013-12-02 | 2014-02-19 | 中电电气(江苏)股份有限公司 | Winding structure of transformer |
| CN103606437A (en) * | 2013-12-04 | 2014-02-26 | 正泰电气股份有限公司 | Winding distribution mode of power transformer with balancing windings |
| CN107068364A (en) * | 2017-04-25 | 2017-08-18 | 国家电网公司 | It is a kind of to balance the power transformer of winding outside |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20190823 |