CN204215865U - A kind of 20kV dry-type earth transformer - Google Patents
A kind of 20kV dry-type earth transformer Download PDFInfo
- Publication number
- CN204215865U CN204215865U CN201420720251.2U CN201420720251U CN204215865U CN 204215865 U CN204215865 U CN 204215865U CN 201420720251 U CN201420720251 U CN 201420720251U CN 204215865 U CN204215865 U CN 204215865U
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- main winding
- winding
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- dry
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Abstract
The utility model discloses a kind of 20kV dry-type earth transformer, comprise transformer core, main winding I, main winding II, main winding III, main winding IV and secondary winding, secondary winding adopts yn connection, and main winding adopts Zn type connection.The utility model has the features such as the cost of material is low, and equipment investment is little, simple and practical, flame-proof explosion-proof, and performance safety is reliable, easy to maintenance.
Description
Technical field
The utility model relates to a kind of dry-type earth transformer.
Background technology
Generally all adopt the operational mode of isolated neutral in China's electric power system in 35kV and following electrical network, in electrical network, the distribution voltage side of main transformer is generally delta connection, and not having can for the neutral point of earth resistance.Along with electric utility development day by day and growth, the cable circuit in urban distribution network increases gradually, and capacitance current is increasing, like this when producing ground arc, if can not reliably extinguish, and the safe operation of and electrical network apparatus insulated with regard to entail dangers to.In order to the generation of Accident prevention, for system provides enough zero-sequence currents and residual voltage, make ground protection action message, need artificially to set up a neutral point, at neutral point access earth resistance, to need to provide a grounding transformer.And current existing grounding transformer voltage between layers is higher, easily produce the problems such as partial discharge, long-time running will destroy coil insulation, then causes transformer to break down.
Summary of the invention
For solving the problems referred to above that prior art exists, the utility model provides a kind of 20kV dry-type earth transformer, and its technical scheme taked is:
This transformer body comprises iron core, main winding I, main winding II, main winding III, main winding IV and secondary winding, wherein iron core adopts 45 ° of five stepping to fold three-phase three-limb, main winding I 2, main winding II 3, main winding III 4 and main winding IV 5 are axial arranged, they are arranged in the outside of secondary winding 6, each winding is set on three stem stems of iron core, main winding I and main winding II are connected, main winding III and main winding IV are connected, then they connect for Zn type connection again, and secondary winding adopts Yn connection.
The utility model main winding adopts drum type brake, by main winding segment processing, reduces voltage between layers, decreases layer insulation thickness, significantly reduce material cost, makes the insulation property of winding more reliable simultaneously, ensures the operational reliability of transformer.The utility model is not only electric power system and provides an artificial neutral point, and exports with the power distribution of 0.4kV, avoids the overlapping investment of transformer station to distribution transformer, reduces the no-load loss of transformer, decrease the consumption of the energy.
The utility model has the features such as the cost of material is low, and equipment investment is little, simple and practical, flame-proof explosion-proof, and performance safety is reliable, easy to maintenance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is that main winding of the present utility model connects schematic diagram;
Fig. 3 is that secondary winding of the present utility model connects schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1, this transformer comprises iron core 1, main winding I 2, main winding II 3, main winding III 4, main winding IV 5 and secondary winding 6, wherein iron core 3 adopts 45 ° of five stepping to fold three-phase three-limb, main winding I 2, main winding II 3, main winding III 4 and main winding IV 5 are axial arranged, they are arranged in the outside of secondary winding 6, and each winding is set on three stem stems of iron core 1.
As shown in Figure 2, main winding I 2 and main winding II 3 are connected, and main winding III 4 and main winding IV 5 are connected, and then they connect for Zn type connection again, and neutral point is drawn.As shown in Figure 3, as distribution power supply in station, secondary winding 6 rated voltage is 0.4kV, adopts Yn connection.
Claims (1)
1. a 20kV dry-type earth transformer, comprise iron core (1), main winding I (2), main winding II (3), main winding III (4), main winding IV (5) and secondary winding (6), it is characterized in that: iron core (1) adopts 45 ° of five stepping to fold three-phase three-limb, main winding I (2), main winding II (3), main winding III (4) and main winding IV (5) axial arranged, they are arranged in the outside of secondary winding (6), each winding is set on three stem stems of iron core (1), main winding I (2) and main winding II (3) are connected, main winding III (4) and main winding IV (5) are connected, then they connect for Zn type connection again, secondary winding (6) adopts Yn connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420720251.2U CN204215865U (en) | 2014-11-27 | 2014-11-27 | A kind of 20kV dry-type earth transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420720251.2U CN204215865U (en) | 2014-11-27 | 2014-11-27 | A kind of 20kV dry-type earth transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204215865U true CN204215865U (en) | 2015-03-18 |
Family
ID=52984514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420720251.2U Expired - Fee Related CN204215865U (en) | 2014-11-27 | 2014-11-27 | A kind of 20kV dry-type earth transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204215865U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946048A (en) * | 2017-12-31 | 2018-04-20 | 江苏天奇新能源集成有限公司 | 110kV resin casting dry-type transformers |
| WO2023004962A1 (en) * | 2021-07-27 | 2023-02-02 | 吴江变压器有限公司 | Grounding transformer comprising secondary winding |
-
2014
- 2014-11-27 CN CN201420720251.2U patent/CN204215865U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946048A (en) * | 2017-12-31 | 2018-04-20 | 江苏天奇新能源集成有限公司 | 110kV resin casting dry-type transformers |
| WO2023004962A1 (en) * | 2021-07-27 | 2023-02-02 | 吴江变压器有限公司 | Grounding transformer comprising secondary winding |
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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: 20150318 Termination date: 20171127 |