CN204010996U - Dry-type distribution transformer with split winding - Google Patents
Dry-type distribution transformer with split winding Download PDFInfo
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- CN204010996U CN204010996U CN201420392089.6U CN201420392089U CN204010996U CN 204010996 U CN204010996 U CN 204010996U CN 201420392089 U CN201420392089 U CN 201420392089U CN 204010996 U CN204010996 U CN 204010996U
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Abstract
The utility model relates to dry-type distribution transformer with split winding, comprise iron core, high-tension coil and low-voltage coil winding, it is characterized in that: described iron core, low-voltage coil winding, high-tension coil is arranged in order layout from inside to outside, described low-voltage coil winding adopts radial splitted construction, it comprises top low-voltage coil and bottom low-voltage coil, between top low-voltage coil and bottom low-voltage coil, be separated by by top and the bottom low-voltage coil silicagel pad, low-voltage coil output busbar lower end, top is inserted in the low-voltage coil of top and is connected conducting with top low-voltage coil, upwards expose low-voltage coil output busbar upper end, top, low-voltage coil output busbar upper end, described bottom is inserted in the low-voltage coil of bottom and is connected conducting with bottom low-voltage coil, and expose downwards bottom low-voltage coil output busbar lower end.The utility model is simple in structure, can improve the anti-short circuit capability of transformer, and transformer impedance voltage in the time of maximum, minimum tap changes little.
Description
Technical field
The utility model relates to a kind of transformer, and specifically a kind of dry-type distribution transformer with split winding, belongs to power equipment technical field of transformer manufacturing.
Background technology
In big power station, using more is two transformer with split windings.Two transformer with split windings are that a winding (normally low pressure winding) is split on electric to irrelevant, the transformer that only only has two windings that weak magnetic contacts each other.Two division winding constructions are identical, capacity is 1/2 of rated capacity, the rated voltage of two windings that split off can identically also can have little difference, can isolated operation also can move simultaneously, can under same capacity, move, also can under different capabilities, move, in the time that their rated voltage is identical, can also parallel running.Transformer with split winding is a kind of special shape in multi winding transformer, be with common multi winding transformer difference: in its low pressure winding, have one or several winding to split into several branch roads that rated capacity equates, these branch roads do not have the contact on electric, and only have the contact of weak magnetic.In electric power system, what use often is dual-winding double-splitting transformer, and it has the low pressure winding of a high pressure winding and two divisions, and the rated voltage of division winding is identical with rated capacity, and their total capacity equals the total capacity of transformer.
The main application of transformer with split winding has two: (1), in the time that two generators pass through a transformer with split winding to system power transmission, the division impedance of transformer with split winding has increased the impedance between two generators effectively, thereby reaches the object that reduces short circuit current.(2) when adopting a transformer with split winding while being divided into Liang Ge branch to two sections of independent bussed supplies, division impedance also makes to have larger impedance between two sections of buses, interacting when reducing busbar short-circuit.
Transformer with split winding and common transformer, see by its structure, almost there is no any difference, its difference is only low pressure astragal itself in each iron core column, there is no serial or parallel connection and its top and terminal are drawn separately, no matter takes which kind of frame mode, between the secondary winding of its division, the coupling of magnetic is more weak, therefore, to the basic demand of transformer with split winding be: several parts of (1) low pressure winding coil division and the insulation system of high-tension coil, require to have enough electrical strengths; (2) resistance value between the every part of low-voltage coil and high-tension coil will equate; (3), while use, every part of low-voltage coil can be received respectively on generator or motor, and can move simultaneously, also can isolated operation, and the division coil with same nominal voltage can parallel running; (4) structure wants simple, approaches as far as possible the structure without divisural line coil transformer.But existing transformer with split winding exists anti-short circuit capability poor, transformer impedance voltage in the time of maximum, minimum tap such as changes greatly at the shortcoming.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of dry-type distribution transformer with split winding is provided, it is simple in structure, can be used as startup/transformer with split winding for subsequent use for power plant, in meeting performance parameter requirement, improve the anti-short circuit capability of transformer, transformer impedance voltage in the time of maximum, minimum tap changes little, is adapted at adopting on 35kV and following similar transformer.
The technical scheme providing according to the utility model: dry-type distribution transformer with split winding, comprise iron core, high-tension coil and low-voltage coil winding, it is characterized in that: described iron core, low-voltage coil winding, high-tension coil is arranged in order layout from inside to outside, described low-voltage coil winding adopts radial splitted construction, it comprises top low-voltage coil and bottom low-voltage coil, between top low-voltage coil and bottom low-voltage coil, be separated by by top and the bottom low-voltage coil silicagel pad, low-voltage coil output busbar lower end, top is inserted in the low-voltage coil of top and is connected conducting with top low-voltage coil, upwards expose low-voltage coil output busbar upper end, top, low-voltage coil output busbar upper end, described bottom is inserted in the low-voltage coil of bottom and is connected conducting with bottom low-voltage coil, and expose downwards bottom low-voltage coil output busbar lower end.
As further improvement of the utility model, described iron core is three-phase three-column structure.
compared with prior art, tool has the following advantages the utility model:
(1) the utility model can be used as startup/transformer with split winding for subsequent use for power plant, in meeting performance parameter requirement, improve the anti-short circuit capability of transformer, transformer impedance voltage in the time of maximum, minimum tap changes little, is adapted at adopting on 35kV and following similar transformer.
(2) after low-voltage coil division, high-tension coil can be increased widely and low-voltage coil respectively divides between part, and short-circuit impedance value between each several part after low-voltage coil division, this short circuit current to limiting network, saving construction investment and floor space has certain stock index.
(3) the top low-voltage coil in low-voltage coil winding and bottom low-voltage coil can be received respectively on generator or motor, can move simultaneously, also can isolated operation, and the division coil with same nominal voltage can parallel running; Can greatly reduce user's cost of investment, also save resource.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail.
As shown in the figure: the dry-type distribution transformer with split winding in embodiment is mainly by unshakable in one's determination 1, high-tension coil 6 and low-voltage coil winding composition, described unshakable in one's determination 1, low-voltage coil winding, high-tension coil 6 is arranged in order layout from inside to outside, described low-voltage coil winding adopts radial splitted construction, it comprises top low-voltage coil 2 and bottom low-voltage coil 3, between top low-voltage coil 2 and bottom low-voltage coil 3, be separated by by top and the bottom low-voltage coil silicagel pad 7, low-voltage coil output busbar 5 lower ends, top are inserted in top low-voltage coil 2 and are connected conducting with top low-voltage coil 2, upwards expose low-voltage coil output busbar 5 upper ends, top, low-voltage coil output busbar 5 upper ends, described bottom are inserted in bottom low-voltage coil 3 and are connected conducting with bottom low-voltage coil 3, and expose downwards bottom low-voltage coil output busbar 5 lower ends.In the utility model embodiment, described unshakable in one's determination 1 preferably adopts three-phase three-column structure.
The effect of the utility model limiting short-circuit current is remarkable.In the time of a division winding branch, short-circuit, short circuit current passes through impedance through more than half.Partly pass through impedance and equal high pressure winding and branch's short-circuit impedance sum, equal one and add the bundle factor of 1/4th times, be multiplied by and pass through impedance.That is to say partly pass through impedance ratio pass through impedance large 1/4th bundle factors doubly pass through impedance, namely large than the short-circuit impedance of common transformer, so short circuit current is little.The utility model is conducive to the improvement of motor self-staring condition.The short-circuit impedance that passes through impedance ratio common transformer of transformer with split winding is little, so the voltage drop of transformer wants less while flowing through starting current, allows motor starting capacity more greatly.In addition, because low-voltage coil winding comprises two branch roads, in the time that a branch road is short-circuited fault, the busbar voltage of another branch road is fallen very little, and residual voltage is higher.
When the utility model uses, the top low-voltage coil 2 in low-voltage coil winding and bottom low-voltage coil 3 can be received respectively on generator or motor, can move simultaneously, also can isolated operation, and the division coil with same nominal voltage can parallel running; Can greatly reduce user's cost of investment, also save resource.
Claims (2)
1. dry-type distribution transformer with split winding, comprise iron core (1), high-tension coil (6) and low-voltage coil winding, it is characterized in that: described iron core (1), low-voltage coil winding, high-tension coil (6) is arranged in order layout from inside to outside, described low-voltage coil winding adopts radial splitted construction, it comprises top low-voltage coil (2) and bottom low-voltage coil (3), between top low-voltage coil (2) and bottom low-voltage coil (3), be separated by by top and the bottom low-voltage coil silicagel pad (7), low-voltage coil output busbar (5) lower end, top is inserted in top low-voltage coil (2) and is connected conducting with top low-voltage coil (2), upwards expose low-voltage coil output busbar (5) upper end, top, low-voltage coil output busbar (5) upper end, described bottom is inserted in bottom low-voltage coil (3) and is connected conducting with bottom low-voltage coil (3), and expose downwards bottom low-voltage coil output busbar (5) lower end.
2. dry-type distribution transformer with split winding as claimed in claim 1, is characterized in that: described iron core (1) is three-phase three-column structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420392089.6U CN204010996U (en) | 2014-07-15 | 2014-07-15 | Dry-type distribution transformer with split winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420392089.6U CN204010996U (en) | 2014-07-15 | 2014-07-15 | Dry-type distribution transformer with split winding |
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| Publication Number | Publication Date |
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| CN204010996U true CN204010996U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420392089.6U Active CN204010996U (en) | 2014-07-15 | 2014-07-15 | Dry-type distribution transformer with split winding |
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| CN (1) | CN204010996U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078215A (en) * | 2014-07-15 | 2014-10-01 | 无锡亿能电力设备有限公司 | Dry type power distribution split winding transformer |
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2014
- 2014-07-15 CN CN201420392089.6U patent/CN204010996U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078215A (en) * | 2014-07-15 | 2014-10-01 | 无锡亿能电力设备有限公司 | Dry type power distribution split winding transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Mei Cunxi road 214191 Jiangsu District Wuxi City, No. 219 Patentee after: Wuxi Yineng electric power equipment Limited by Share Ltd Address before: Mei Cunxi road 214191 Jiangsu District Wuxi City, No. 219 Patentee before: Wuxi ENOW Electric Power Equipment Co., Ltd. |