CN220710104U - Three-phase transformer with low-voltage side double-voltage output and input - Google Patents
Three-phase transformer with low-voltage side double-voltage output and input Download PDFInfo
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- CN220710104U CN220710104U CN202322450281.8U CN202322450281U CN220710104U CN 220710104 U CN220710104 U CN 220710104U CN 202322450281 U CN202322450281 U CN 202322450281U CN 220710104 U CN220710104 U CN 220710104U
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- 238000004146 energy storage Methods 0.000 abstract description 17
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Abstract
The utility model relates to the technical field of transformers, in particular to a low-voltage side double-voltage output-input three-phase transformer, which is provided with three iron core columns, wherein an outer layer winding and an inner layer winding are sleeved on each iron core column in a concentric manner, and the outer layer winding is used as a high-voltage input-output winding; the inner layer winding is cut off, a tap is arranged at the cut-off position, the taps are connected through a tapping switch outside the transformer, and when the tapping switch is closed, the whole inner layer winding is used as a medium-voltage winding; when the tapping switch is disconnected, the inner ring of the inner layer winding is used as a low-voltage winding. The utility model has simple structure, scientific and reasonable design and can meet the actual requirements of the compressed air energy storage power station.
Description
Technical Field
The utility model relates to the technical field of transformers, in particular to a low-voltage side double-voltage output and input three-phase transformer.
Background
A three-phase transformer is a device for converting a three-phase ac voltage of a certain value into another or several voltages of different values having the same frequency; the three-phase transformer is composed of two or more coil windings wound on the same iron core, and the windings are connected by alternating magnetic field and work according to electromagnetic induction principle. The three-phase transformer for the existing power station is mainly a double-winding three-phase transformer because the conventional power station supplies power to a load source, each primary coil and each secondary coil are concentrically sleeved on an iron core column, the inner coil is a low-voltage winding, the outer coil is a high-voltage winding, and the three-phase transformer does not need to meet the use requirements of multi-stage input and output under the constant volume mode.
For large and medium-sized compressed air energy storage power stations, the voltage level of a conventional generator is different from that of an air compressor, but the voltage level of the conventional generator is equal to that of the air compressor, when a unit wiring mode is adopted, three-phase transformers of 500kV (220 kV)/20 kV (18.5 kV) are generally used for generating electricity, three-phase transformers of 500kV (220 kV)/10 kV are used for compressed air energy storage of the air compressor, and two sets of three-phase transformer equipment are used simultaneously, so that the problems of large occupied area and high manufacturing cost exist.
Disclosure of Invention
The utility model aims to provide a low-voltage side double-voltage output and input three-phase transformer, which solves the problems of large occupied area and high manufacturing cost of two sets of three-phase transformer equipment in the prior art.
In order to solve the technical problems, the utility model adopts the following technical scheme: the three-phase transformer is provided with three iron core columns, an outer layer winding and an inner layer winding are sleeved on each iron core column in a concentric manner, and the outer layer winding is used as a high-voltage input/output winding; the inner layer winding is cut off, a tap is arranged at the cut-off position, the taps are connected through a tapping switch outside the transformer, and when the tapping switch is closed, the whole inner layer winding is used as a medium-voltage winding; when the tapping switch is disconnected, the inner ring of the inner layer winding is used as a low-voltage winding.
The voltage of the high-voltage winding is 220kV or 500kV, the voltage of the medium-voltage winding is 18.5k or 20kV, and the voltage of the low-voltage winding is 10kV.
For a compressed air energy storage power station, when the generator is in a power generation state, the generator side is input by 20kV (or 18 kV) of a medium-voltage winding, boosted by a transformer and then sent to the 500kV (or 220 kV) of a power grid side by a high-voltage winding for output; when the compressed air energy storage power station is in an energy storage state, the tapping switch is adjusted to be disconnected, 500kV (or 220 kV) input is realized at the power grid side through the high-voltage winding, and the power is reduced in voltage through the transformer and then is sent to 10kV output at the energy storage equipment side through the low-voltage winding. The tap switch changes the number of turns of the inner layer winding of the transformer by closing or opening the tap of the low-voltage winding, adjusts the transformation ratio of the transformer and achieves the effect of adjusting the voltage of the low-voltage side.
The three-phase transformer disclosed by the utility model has the characteristics of strong practicability and flexible operation, and has a positive effect on reducing the cost of compressed air energy storage equipment and construction and promoting the conversion of a compressed air energy storage power station from an demonstration item to commercial operation.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a flow chart of the use of the present utility model, wherein: a is a power generation working condition, and the sectional switch is closed; and b is the compressed air energy storage working condition, and the sectional switch is disconnected.
The transformer comprises an inner layer winding 1, an outer layer winding 2 and a tapping switch 3.
Detailed Description
Example 1: the three-phase transformer is provided with three iron core columns, an outer layer winding and an inner layer winding are sleeved on each iron core column in a concentric manner, and the outer layer winding is used as a high-voltage input/output winding; the inner layer winding is cut off, a tap is arranged at the cut-off position, the taps are connected through a tapping switch outside the transformer, and when the tapping switch is closed, the whole inner layer winding is used as a medium-voltage winding; when the tapping switch is disconnected, the inner ring of the inner layer winding is used as a low-voltage winding. The specific implementation voltage class is implemented according to 220kV/18.5kV/10kV, wherein the capacity of each stage of the three-phase transformer is 250MVA, the setting is carried out according to 100:100:100, and the power of the generator is 200MW. According to practical application, generator side voltage is 18.5kV, and voltage boosting transformation is achieved by adjusting a tap changer (closing) to adjust a medium-voltage winding, 220 kV-class voltage on the power grid side is output, and auxiliary station service electricity (excluding compressor energy storage) reduces the voltage from 220kV to 10kV from the power grid side through a small transformer. And during energy storage, the tapping switch is regulated (disconnected), 220kV on the power grid side is reduced to 10kV on the energy storage equipment side, compressed air of the air compressor is supplied to use, and three voltage levels are regulated to meet the actual application requirements of compressed air energy storage.
Under the condition that the three voltage class capacities are the same and are matched with the generator capacity and the total capacity of the air compressor, the whole three-phase transformer winding is divided into two layers, and the innermost layer can be a medium-voltage winding which is used as the 18.5kV input of the generator side through changing the tapping switch, and can also be a low-voltage winding which is used for outputting 10kV of air compressors and station service electricity during energy storage. The outermost winding is a high-voltage winding with 220kV output on the power grid side. The low-voltage side tap is added on the basis of the existing double-winding three-phase transformer, and the tap switch is connected to realize medium-low voltage conversion, so that the adjustment of the capacities of three voltage classes of 220kV/18.5kV/10kV is achieved.
The turns ratio of each winding is 220/18.5 (step-up) and 220/10 (step-down), wherein the turns ratio of the low-voltage winding is realized in an 8.5+10 mode during step-up.
The following table shows the regulated voltage parameters provided for the output voltage of the power station as the input voltage of the three-phase transformer, the capacity ratio of the three voltage levels is 100:100:100, the capacity is input by 18.5kV (or 20 kV) of the generator side during power generation, the boosting is changed into 220kV (or 500 kV) of the high-voltage side of the power grid, and the boosting scheme corresponds to the boosting scheme. The capacity is input from 220kV (500 kV) high voltage on the power grid side during energy storage, and the voltage reduction is changed into 10kV output on the low voltage side of the energy storage equipment, and the voltage reduction scheme corresponds to the voltage reduction scheme.
Claims (3)
1. The three-phase transformer is provided with three iron core columns, an outer layer winding and an inner layer winding are sleeved on each iron core column in a concentric manner, and the outer layer winding is used as a high-voltage input/output winding; the inner layer winding is cut off, a tap is arranged at the cut-off position, the taps are connected through a tapping switch outside the transformer, and when the tapping switch is closed, the whole inner layer winding is used as a medium-voltage winding; when the tapping switch is disconnected, the inner ring of the inner layer winding is used as a low-voltage winding.
2. A low side dual voltage input and output three phase transformer as claimed in claim 1, characterized in that the voltage of the high voltage winding is 220kV or 500kV, the voltage of the medium voltage winding is 18.5k or 20kV, and the voltage of the low voltage winding is 10kV.
3. A low side dual voltage input/output three phase transformer as claimed in claim 1 wherein the capacity ratio of the high, medium and low side terminals is 100:100:100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322450281.8U CN220710104U (en) | 2023-09-11 | 2023-09-11 | Three-phase transformer with low-voltage side double-voltage output and input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322450281.8U CN220710104U (en) | 2023-09-11 | 2023-09-11 | Three-phase transformer with low-voltage side double-voltage output and input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220710104U true CN220710104U (en) | 2024-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322450281.8U Active CN220710104U (en) | 2023-09-11 | 2023-09-11 | Three-phase transformer with low-voltage side double-voltage output and input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220710104U (en) |
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2023
- 2023-09-11 CN CN202322450281.8U patent/CN220710104U/en active Active
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