CN220138102U - Voltage regulating structure of single-phase and two-phase on-load switch group of transformer - Google Patents
Voltage regulating structure of single-phase and two-phase on-load switch group of transformer Download PDFInfo
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- CN220138102U CN220138102U CN202321487768.7U CN202321487768U CN220138102U CN 220138102 U CN220138102 U CN 220138102U CN 202321487768 U CN202321487768 U CN 202321487768U CN 220138102 U CN220138102 U CN 220138102U
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 48
- 238000004804 winding Methods 0.000 claims abstract description 123
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000016507 interphase Effects 0.000 abstract description 13
- 238000005056 compaction Methods 0.000 abstract description 2
- 230000008092 positive effect Effects 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model relates to a voltage regulating structure of a single-phase and two-phase on-load switch group of a transformer, and belongs to the technical field of transformers. The technical proposal is as follows: the high-voltage winding of the transformer adopts a triangle connection method, the existing load voltage regulation is performed at high voltage compaction, the voltage regulation is performed by adopting the combination of a single-phase load switch and a two-phase load switch, the voltage regulation winding of one phase is connected to the single-phase load switch, and the voltage regulation winding of the other two phases is simultaneously connected to the two-phase load switch. The utility model has the positive effects that: for the on-load voltage regulating transformer with the high voltage in an angle connection method, when the voltage level is higher and the voltage regulation cannot be realized by adopting the three-phase on-load tap switch, a voltage regulation scheme of a switch group formed by the single-phase on-load switch and the two-phase on-load switch can be adopted. The winding connection mode is adjusted by changing the winding direction of part of windings, so that the inter-phase potential difference of the windings is reduced, and the inter-phase allowable potential difference range and the lead connection structure requirement of the two-phase on-load switch are met.
Description
Technical Field
The utility model relates to a voltage regulating structure of a single-phase and two-phase on-load switch group of a transformer, and belongs to the technical field of transformers.
Background
When a large harmonic source exists in a power supply system, a transformer with high voltage in angular connection is often adopted. The connection method can prevent third harmonic and zero sequence current from entering the system, and plays a role in protecting equipment. The transformer has strong unbalanced load capacity, good operation effect and improved power supply quality. For the on-load voltage regulating transformer with the high voltage in the angle connection method in the prior art, when the voltage level is lower, one three-phase on-load tap-changer can be adopted to realize voltage regulation, and under the condition of higher voltage level, three single-phase on-load switches can be adopted to be combined into a switch group, but the manufacturing cost of the transformer is relatively higher. In order to reduce the cost, a switch group consisting of a single-phase and two-phase on-load switch can be adopted, but when the scheme is adopted, the risk that the voltage between the winding phases exceeds the withstand voltage range of the two-phase on-load switch exists. How to control the inter-phase voltage of a two-phase on-load switch within the allowable range of the switch is a key problem that has to be solved in the art.
Disclosure of Invention
The utility model aims to provide a voltage regulating structure of a single-phase and two-phase on-load switch group of a transformer, which can reduce the inter-phase potential difference of windings by changing the winding direction of partial windings and adjusting the winding connection mode, thereby meeting the inter-phase allowable potential difference range of the two-phase on-load switch and the requirement of a lead connection structure and solving the problems existing in the prior art.
The technical scheme of the utility model is as follows:
the voltage regulating structure of the single-phase and two-phase on-load switch group of the transformer, the high-voltage winding of the transformer adopts a triangle connection method, the existing on-load voltage regulation is compacted at high voltage, the voltage regulation is carried out by adopting the combination of the single-phase and two-phase on-load switches, the voltage regulating winding of one phase is connected to the single-phase on-load switch, and the voltage regulating winding of the other two phases is simultaneously connected to the two-phase on-load switch; the transformer connection mode is connected according to the following modes: the end of the phase A high-voltage winding is connected with the end of the phase A voltage-regulating winding, the end of the phase B high-voltage winding is connected with the end of the phase B voltage-regulating winding, and the end of the phase C high-voltage winding is connected with the end of the phase C voltage-regulating winding; the head end of the phase A high-voltage winding and the tail end of the phase B voltage-regulating winding are connected to the outgoing line of the phase A sleeve, the head end of the phase B high-voltage winding and the tail end of the phase C high-voltage winding are connected to the outgoing line of the phase B sleeve, and the head end of the phase C voltage-regulating winding and the tail end of the phase A voltage-regulating winding are connected to the outgoing line of the phase C sleeve; the phase A voltage regulating winding and the phase C voltage regulating winding are connected to the two-phase on-load switch, and the phase B voltage regulating winding is connected to the single-phase on-load switch.
The winding directions of the C-phase high-voltage winding and the C-phase voltage regulating winding are opposite to those of the A-phase high-voltage winding, the B-phase high-voltage winding, the A-phase voltage regulating winding and the B-phase voltage regulating winding so as to meet the structural requirement that the two-phase on-load switch is the same leading-out end.
According to the utility model, the inter-phase voltage of the suspension end of the voltage regulating winding connected to the same switch is reduced by changing the connection mode of the three-phase winding, so that the allowable range of the inter-phase voltage of the two-phase switch is satisfied.
The utility model has the positive effects that: for the on-load voltage regulating transformer with the high voltage in an angle connection method, when the voltage level is higher and the voltage regulation cannot be realized by adopting the three-phase on-load tap switch, a voltage regulation scheme of a switch group formed by the single-phase on-load switch and the two-phase on-load switch can be adopted. The winding connection mode is adjusted by changing the winding direction of part of windings, so that the inter-phase potential difference of the windings is reduced, and the inter-phase allowable potential difference range and the lead connection structure requirement of the two-phase on-load switch are met.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model;
FIG. 2 is a schematic diagram of the wiring of an embodiment of the present utility model;
in the figure: the phase A voltage regulating winding 1, the phase B voltage regulating winding 2, the phase C voltage regulating winding 3, the phase A high-voltage winding 4, the phase B high-voltage winding 5, the phase C high-voltage winding 6, the single-phase on-load switch 7, the two-phase on-load switch 8, the phase A voltage regulating winding head 11, the phase B voltage regulating winding head 12, the phase C voltage regulating winding head 13, the phase A high-voltage winding head 14, the phase B high-voltage winding head 15 and the phase C high-voltage winding head 16.
Detailed Description
The utility model is further described by way of examples with reference to the accompanying drawings.
The voltage regulating structure of the single-phase and two-phase on-load switch group of the transformer, the high-voltage winding of the transformer adopts a triangle connection method, the existing on-load voltage regulation is compacted at high voltage, the voltage regulation is carried out by adopting the combination of the single-phase and two-phase on-load switches, the voltage regulating winding of one phase is connected to the single-phase on-load switch, and the voltage regulating winding of the other two phases is simultaneously connected to the two-phase on-load switch; the transformer connection mode is connected according to the following modes: the tail end of the phase A high-voltage winding 4 is connected with the head end of the phase A voltage-regulating winding 1, the tail end of the phase B high-voltage winding 5 is connected with the head end of the phase B voltage-regulating winding 2, and the head end of the phase C high-voltage winding 6 is connected with the tail end of the phase C voltage-regulating winding 3; the head end of the A-phase high-voltage winding 4 and the tail end of the B-phase voltage regulating winding 2 are connected to an A-phase sleeve outgoing line, the head end of the B-phase high-voltage winding 5 and the tail end of the C-phase high-voltage winding 6 are connected to a B-phase sleeve outgoing line, and the head end of the C-phase voltage regulating winding 3 and the tail end of the A-phase voltage regulating winding 1 are connected to a C-phase sleeve outgoing line; the phase A voltage regulating winding 1 and the phase C voltage regulating winding 3 are connected to a two-phase on-load switch, and the phase B voltage regulating winding 2 is connected to a single-phase on-load switch. The winding direction of the C-phase high-voltage winding 6 and the C-phase voltage regulating winding 3 is opposite to the winding direction of the A-phase high-voltage winding 4, the B-phase high-voltage winding 5, the A-phase voltage regulating winding 1 and the B-phase voltage regulating winding 2 so as to meet the structural requirement that the two-phase on-load switch is the same leading-out end.
The high-voltage winding of the prior art transformer adopts a triangle connection method, and the following connection method is adopted in the prior art of high-voltage load voltage regulation in high-voltage compaction: the end of the A phase high-voltage winding is connected with the head end of the A phase voltage-regulating winding, the end of the B phase high-voltage winding is connected with the head end of the B phase voltage-regulating winding, the end of the C phase high-voltage winding is connected with the head end of the C phase voltage-regulating winding, the head end of the A phase high-voltage winding and the end of the B phase voltage-regulating winding are connected to the outgoing line of the A phase sleeve, the head end of the B phase high-voltage winding and the end of the C phase voltage-regulating winding are connected to the outgoing line of the B phase sleeve, and the head end of the C phase high-voltage winding and the end of the A phase voltage-regulating winding are connected to the outgoing line of the C phase sleeve. When the transformer is not in the maximum or minimum tapping, a part of the voltage regulating winding is not connected into the circuit and is in a suspension state, the suspension part of the voltage regulating winding can generate higher oscillating voltage under the action of external impulse voltage, and the interphase voltage is increased and even exceeds the interphase voltage allowable range of the three-phase on-load switch. According to the utility model, the inter-phase voltage of the suspension end of the voltage regulating winding connected to the same switch is reduced by changing the connection mode of the three-phase winding, so that the allowable range of the inter-phase voltage of the two-phase switch is satisfied.
Claims (1)
1. The utility model provides a voltage regulation structure of single-phase and two-phase on-load switch group of transformer which characterized in that: the high-voltage winding of the transformer adopts a triangle connection method, the voltage is regulated by adopting the combination of a single-phase load switch and a two-phase load switch at high voltage, the voltage regulating winding of one phase is connected to the single-phase load switch, and the voltage regulating winding of the other two phases is simultaneously connected to the two-phase load switch; the transformer connection mode is connected according to the following modes: the tail end of the phase A high-voltage winding (4) is connected with the head end of the phase A voltage-regulating winding (1), the tail end of the phase B high-voltage winding (5) is connected with the head end of the phase B voltage-regulating winding (2), and the head end of the phase C high-voltage winding (6) is connected with the tail end of the phase C voltage-regulating winding (3); the head end of the phase A high-voltage winding (4) and the tail end of the phase B voltage-regulating winding (2) are connected to an outgoing line of the phase A sleeve, the head end of the phase B high-voltage winding (5) and the tail end of the phase C high-voltage winding (6) are connected to an outgoing line of the phase B sleeve, and the head end of the phase C voltage-regulating winding (3) and the tail end of the phase A voltage-regulating winding (1) are connected to an outgoing line of the phase C sleeve; the phase A voltage regulating winding (1) and the phase C voltage regulating winding (3) are connected to a two-phase on-load switch, and the phase B voltage regulating winding (2) is connected to a single-phase on-load switch; and the winding directions of the C-phase high-voltage winding and the C-phase voltage regulating winding are opposite to those of the A-phase high-voltage winding, the B-phase high-voltage winding, the A-phase voltage regulating winding and the B-phase voltage regulating winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321487768.7U CN220138102U (en) | 2023-06-12 | 2023-06-12 | Voltage regulating structure of single-phase and two-phase on-load switch group of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321487768.7U CN220138102U (en) | 2023-06-12 | 2023-06-12 | Voltage regulating structure of single-phase and two-phase on-load switch group of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220138102U true CN220138102U (en) | 2023-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321487768.7U Active CN220138102U (en) | 2023-06-12 | 2023-06-12 | Voltage regulating structure of single-phase and two-phase on-load switch group of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220138102U (en) |
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2023
- 2023-06-12 CN CN202321487768.7U patent/CN220138102U/en active Active
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