CN220400397U - Voltage regulator for railway traction transformer - Google Patents
Voltage regulator for railway traction transformer Download PDFInfo
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- CN220400397U CN220400397U CN202321486378.8U CN202321486378U CN220400397U CN 220400397 U CN220400397 U CN 220400397U CN 202321486378 U CN202321486378 U CN 202321486378U CN 220400397 U CN220400397 U CN 220400397U
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 129
- 238000004804 winding Methods 0.000 claims abstract description 123
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 230000033228 biological regulation Effects 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003828 downregulation Effects 0.000 description 1
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Abstract
The utility model relates to the field of voltage regulation of transformers, in particular to a voltage regulating device of a railway traction transformer, which comprises a high-voltage winding, wherein the middle part of the high-voltage winding is connected with a single-bridge bridging voltage regulating winding through two middle taps; the single-bridge bridging voltage regulating winding comprises a first voltage regulating winding and a second voltage regulating winding; the utility model sets two middle taps in the middle of the high voltage winding, and connects the two middle taps with two independent voltage regulating windings, so the short circuit acting force is obviously reduced, at the same time, the single bridge bridging voltage regulating winding is still located in the middle of the high voltage winding in electric reality, the impact distribution is obviously improved under the full insulation condition, the inter-turn and inter-cake insulation is correspondingly reduced after the voltage gradient of the voltage regulating winding is reduced, the winding filling rate is improved, and the body volume is reduced.
Description
Technical Field
The utility model relates to the field of voltage regulation of transformers, in particular to a voltage regulating device of a railway traction transformer.
Background
As the requirements of railway systems on power supply quality are higher and higher, the primary side voltage regulation range of the traction transformer is gradually widened. At present, a mode (see fig. 1) of setting an independent voltage regulating coil to regulate voltage at the tail part of a high-voltage coil is generally adopted in the industry, and the voltage regulating mode has two modes of positive and negative regulation and bridging regulation, and the two modes have larger defects. Unlike power transformer, traction transformer is fully insulated, has the working condition that impulse voltage enters from the tail end, and the arrangement of an independent voltage regulating coil can solve the problems of ampere turn balance and short circuit resistance, but the impulse voltage enters from the head end and can cause high-amplitude voltage oscillation of the voltage regulating tail end, and the impulse voltage enters from the voltage regulating tail end and can bring about great damage to an insulation system of a voltage regulating winding.
To ensure the impact characteristics, the longitudinal capacitance of the tail voltage regulating section must be increased, and the free oscillating voltage of the non-connected part under the minimum tapping condition is considered. At this time, the turn-to-turn and inter-segment insulation of the voltage regulating winding are increased, and the winding also has to adopt a complex winding form of four-segment entanglement to increase the longitudinal capacitance. The radial dimension of the voltage regulating winding is almost equal to that of the high-voltage winding under various condition limitations, but the axial height (wire part) only occupies 1/4 of that of the high-voltage winding, the filling coefficient is very low, a large amount of space is wasted, and the safety margin only reaches critical conditions after a plurality of measures are taken.
The utility model provides a voltage regulating device for a railway traction transformer.
Disclosure of Invention
The utility model aims to provide a voltage regulating device for a railway traction transformer, which can improve impact, improve winding filling rate and reduce the volume of a transformer body.
The specific technical scheme provided by the utility model is as follows: the utility model provides a voltage regulating device of a railway traction transformer, which comprises a high-voltage winding, wherein the middle part of the high-voltage winding is connected with a single-bridge bridging voltage regulating winding through a middle tap;
the single-bridge bridging voltage regulating winding comprises a first voltage regulating winding and a second voltage regulating winding;
the middle taps comprise a first middle tap and a second middle tap;
the first middle tap is connected with the first voltage regulating winding; the second middle tap is connected with a second voltage regulating winding;
the first voltage regulating winding and the second voltage regulating winding comprise a plurality of coils and voltage regulating taps led out from the coils;
the voltage regulating tap is connected with a voltage regulating switch, and the first voltage regulating winding is electrically connected with the second voltage regulating winding through the voltage regulating switch.
Further, the winding directions of the plurality of coils included in the first voltage regulating winding and the second voltage regulating winding are the same, are sequentially and electrically connected in series, and are opposite to the winding direction of the high voltage winding.
Further, the first voltage regulating winding and the second voltage regulating winding are arranged on the same paper cylinder, and the first voltage regulating winding and the second voltage regulating winding are separated by end rings.
Further, the height of the end loop corresponds to the height between the first center tap and the second center tap.
Further, an insulating gap is arranged at the middle tap of the high-voltage winding.
Further, the voltage regulating switch adopts a single-bridge bridging voltage regulating non-excitation switch.
The utility model has the beneficial effects that: the middle part of the high-voltage winding is provided with two middle taps, and the two middle taps are respectively connected with two independent voltage regulating windings, so that the short-circuit acting force is obviously reduced, meanwhile, the single-bridge bridging voltage regulating winding is still positioned in the middle of the high-voltage winding in an electric way, the impact distribution is obviously improved under the full insulation condition, and the inter-turn and inter-cake insulation is correspondingly reduced after the voltage gradient of the voltage regulating winding is reduced, so that the winding filling rate is improved, and the body volume is reduced.
In addition, the utility model has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic diagram of a conventional railway traction transformer voltage regulating device.
Fig. 2 shows a schematic diagram of a voltage regulating device for a railway traction transformer according to an embodiment of the present utility model.
Fig. 3 shows a schematic diagram of the internal connection of a voltage regulating switch of a traction transformer of a railway according to an embodiment of the present utility model.
1. A first high voltage winding; 2. a first voltage regulating winding; 3. a second voltage regulating winding; 4. a second high voltage winding; 5. a coil; 6. a voltage-regulating tap; 7. a voltage regulating switch; a', a first center tap; x', a second center tap.
Detailed Description
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
The utility model provides an embodiment of a voltage regulating device of a railway traction transformer, as shown in fig. 2, wherein the voltage regulating device comprises a high-voltage winding, and a single-bridge bridging voltage regulating winding is connected to the middle part of the high-voltage winding through two middle taps; the middle tap is a first middle tap A 'and a second middle tap X', the high-voltage winding is divided into a first high-voltage winding 1 and a second high-voltage winding 4, and the single-bridge bridging voltage regulating winding comprises a first voltage regulating winding 2 and a second voltage regulating winding 3.
The first middle tap A' is connected with the first voltage regulating winding 2; the second center tap X' is connected to the second voltage regulating winding 3.
The first voltage regulating winding 2 and the second voltage regulating winding 3 each include a plurality of coils 5 and voltage regulating taps 6 led out from the respective coils.
The voltage regulating tap 6 is connected with a voltage regulating switch 7, and the first voltage regulating winding 2 and the second voltage regulating winding 3 are electrically connected through the voltage regulating switch 7.
It should be noted that the voltage regulating device of the railway traction transformer provided by the utility model is applied to the phase A and the phase C, the phase B is not provided with the voltage regulating device provided by the utility model, and the voltage regulating devices of the phase A and the phase C are identical, so that the description is not repeated.
Illustratively, the winding directions of the plurality of coils 5 included in the first voltage regulating winding 2 and the second voltage regulating winding 3 are the same and are electrically connected in series in turn, and are opposite to the winding direction of the high voltage winding; the voltage regulating switch 7 adopts a single bridge bridging voltage regulating non-excitation switch.
For example, in this embodiment, taking the a-phase input as an example, the a-phase input end is connected to the head end of the first high-voltage winding 1, and the first voltage-regulating winding 2 includes four coils 5, such as a first coil L1, a second coil L2, a third coil L3, and a fourth coil L4, respectively. The first voltage-regulating winding 2 includes five voltage-regulating taps, such as a first voltage-regulating tap X1 led out from the lower end of the first coil L1, a second voltage-regulating tap X2 led out from the junction of the first coil L1 and the second coil L2, a third voltage-regulating tap X3 led out from the junction of the second coil L2 and the third coil L3, a fourth voltage-regulating tap X4 led out from the junction of the third coil L3 and the fourth coil L4, and a fifth voltage-regulating tap X5 led out from the upper end of the fourth coil.
The second voltage regulating winding also comprises four sections of coils, namely a fifth coil L5, a sixth coil L6, a seventh coil L7 and an eighth coil L8. The second voltage regulating winding comprises five voltage regulating taps, namely a sixth voltage regulating tap X6 led out from the lower end of the fifth coil, a seventh voltage regulating tap X7 led out from the joint of the fifth coil L5 and the sixth coil L6, an eighth voltage regulating tap X8 led out from the joint of the sixth coil L6 and the seventh coil L7, a ninth voltage regulating tap X9 led out from the joint of the seventh coil L7 and the eighth coil L8 and a tenth voltage regulating tap X10 led out from the upper end of the eighth voltage regulating tap.
Taps in the first voltage regulating winding 2 and the second voltage regulating winding 3 are connected with a single-bridge bridging voltage regulating non-excitation switch, specifically, for example, a first voltage tap X1 is connected with a pin 10 of the single-bridge bridging voltage regulating non-excitation switch; the second voltage tap X2 is connected with a pin 8 of the single-bridge bridging voltage-regulating non-excitation switch; the third voltage tap X3 is connected with a pin 6 of the single-bridge bridging voltage-regulating non-excitation switch; the fourth voltage tap X4 is connected with a pin 4 of the single-bridge bridging voltage-regulating non-excitation switch; the fifth voltage tap X5 is connected with a pin 2 of the single-bridge bridging voltage-regulating non-excitation switch; the sixth voltage tap X6 is connected with a pin 11 of the single-bridge bridging voltage-regulating non-excitation switch; the seventh voltage tap X7 is connected with a pin 9 of the single-bridge bridging voltage-regulating non-excitation switch; the eighth voltage tap X8 is connected with a pin 7 of the single-bridge bridging voltage-regulating non-excitation switch; the ninth voltage tap X9 is connected with a pin 5 of the single-bridge bridging voltage-regulating non-excitation switch; the tenth voltage tap X10 is connected to pin 3 of the single bridge cross-over voltage regulating non-excited switch.
The internal connection relation of the single-bridge jumper voltage-regulating non-excitation switch is shown in figure 3, namely, a pin 10 is connected with a pin 11 and a pin 9, and a pin 9-pin 8-pin 7-pin 6-pin 5-pin 4-pin 3-pin 2; for example, if pin 10 and pin 9 are selected, the voltage across the sixth end of the coil, and if pin 8 and pin 7 are selected, the voltages between the first, sixth and seventh coils are selected.
Because the first middle tap A 'is connected with the first voltage regulating tap X1, the first middle tap A' is at the same potential as the first voltage regulating tap X1, and the second middle tap X 'is connected with the sixth voltage regulating tap, so that the second middle tap X' is at the same potential as the sixth voltage regulating tap, and the current direction is changed.
Because the winding direction of the first voltage regulating winding and the second voltage regulating winding is opposite to the winding direction of the first high voltage winding and the second high voltage winding, the magnetic flux direction of the voltage regulating winding and the high voltage winding is consistent.
Illustratively, the first voltage regulating winding 2 and the second voltage regulating winding 3 are wound on the same paper tube, and the first voltage regulating winding 2 and the second voltage regulating winding 3 are separated by using end rings, the height of the end rings is matched with the first middle tap (A ') and the second middle tap (X') in the middle of the high voltage winding, the coils are convenient to be sleeved, and the end rings are also used for increasing the electric insulation strength between the wire coil wire representations of the voltage regulating taps 6 in the first voltage regulating winding 2 and the second voltage regulating winding 3.
For example, in order to ensure the electrical strength of the transformer, the insulation distances between the first high voltage winding 1 and the first voltage regulating winding 2 and between the second high voltage winding 4 and the second voltage regulating winding 3 are adjusted such that the insulation distances are greater than a certain threshold value.
Illustratively, a paper tube wound by the first voltage regulating winding 2 and the second voltage regulating winding 3 is provided with a gap, and the paper tube is also used for increasing the channel distance between the high voltage winding and the voltage regulating winding, and enlarging the thickness of the stay, so that the coil sleeve is a middle tap for leading out the high voltage winding.
Although the present utility model has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present utility model is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present utility model by those skilled in the art without departing from the spirit and scope of the present utility model, and it is intended that all such modifications and substitutions be within the scope of the present utility model/be within the scope of the present utility model as defined by the appended claims. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (6)
1. The voltage regulating device of the railway traction transformer is characterized by comprising a high-voltage winding, wherein the middle part of the high-voltage winding is connected with a single-bridge bridging voltage regulating winding through a middle tap;
the single-bridge bridging voltage regulating winding comprises a first voltage regulating winding and a second voltage regulating winding;
the middle taps comprise a first middle tap and a second middle tap;
the first middle tap is connected with the first voltage regulating winding; the second middle tap is connected with a second voltage regulating winding;
the first voltage regulating winding and the second voltage regulating winding comprise a plurality of coils and voltage regulating taps led out from the coils;
the voltage regulating tap is connected with a voltage regulating switch, and the first voltage regulating winding is electrically connected with the second voltage regulating winding through the voltage regulating switch.
2. The voltage regulator of railway traction transformer according to claim 1, wherein the plurality of coils included in the first voltage regulating winding and the second voltage regulating winding are electrically connected in series in the same winding direction and are opposite to the winding direction of the high voltage winding.
3. The voltage regulator of railway traction transformer as claimed in claim 2, wherein the first voltage regulating winding and the second voltage regulating winding are on the same paper tube and are separated by end rings.
4. A railway traction transformer voltage regulator according to claim 3, wherein the height of the end ring corresponds to the height between the first and second center taps.
5. The voltage regulator of railway traction transformer as claimed in claim 1, wherein an insulation gap is provided at a center tap of the high voltage winding.
6. The voltage regulator of the railway traction transformer according to claim 1, wherein the voltage regulating switch is a single bridge jumper voltage regulating non-exciting switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321486378.8U CN220400397U (en) | 2023-06-12 | 2023-06-12 | Voltage regulator for railway traction transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321486378.8U CN220400397U (en) | 2023-06-12 | 2023-06-12 | Voltage regulator for railway traction transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220400397U true CN220400397U (en) | 2024-01-26 |
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ID=89597128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321486378.8U Active CN220400397U (en) | 2023-06-12 | 2023-06-12 | Voltage regulator for railway traction transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220400397U (en) |
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2023
- 2023-06-12 CN CN202321486378.8U patent/CN220400397U/en active Active
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