CN217035360U - Foil type phase-shifting transformer structure - Google Patents
Foil type phase-shifting transformer structure Download PDFInfo
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- CN217035360U CN217035360U CN202220863869.9U CN202220863869U CN217035360U CN 217035360 U CN217035360 U CN 217035360U CN 202220863869 U CN202220863869 U CN 202220863869U CN 217035360 U CN217035360 U CN 217035360U
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Abstract
The utility model relates to a foil type phase-shifting transformer structure, which comprises two twelve-pulse rectifier transformers, wherein a single twelve-pulse rectifier transformer comprises an iron core, a low-voltage winding sleeved on the iron core and a high-voltage winding sleeved on the outer side of the low-voltage winding, and is characterized in that: the number of turns of the high-voltage winding is divided into two parts, namely a phase-shifting winding and a main winding; the front side and the rear side of the upper end of the iron core are provided with upper clamping pieces, and the front upper clamping piece and the rear upper clamping piece are fixed together through bolts; the front side and the rear side of the lower end of the iron core are provided with lower clamping pieces, the front lower clamping piece and the rear lower clamping piece are fixed together through bolts, the upper clamping piece and the lower clamping piece are fixedly connected through a pull rod, and the two ends of the pull rod are provided with threads and are fixed with the upper clamping piece and the lower clamping piece through nuts. The utility model has simple structure and strong short-circuit resistance, and is mainly applied to enhancing the capability of the distribution transformer for inhibiting the pollution of harmonic waves to a power grid.
Description
Technical Field
The utility model relates to a foil type phase-shifting transformer structure, and belongs to the field of phase-shifting transformers.
Background
Along with the rapid development of the industry, the demand of the rectifying equipment is increasing day by day, and simultaneously, a large amount of harmonic waves generated by the rectifying system also seriously pollute the power grid, so the harmonic wave pollution in the rectifying system must be restrained, and the pollution of the frequency converter to the power grid can be effectively eliminated by adopting the phase-shifting rectifier transformer.
Disclosure of Invention
The utility model provides a foil type phase-shifting transformer structure with simple structure and strong short-circuit resistance in order to make up the defects of the prior art.
The utility model is realized by the following technical scheme:
the utility model provides a foil formula phase-shifting transformer structure, includes two twelve pulse wave rectifier transformers, and the twelve pulse wave rectifier transformer of single platform includes the iron core, the low voltage winding of cover on the iron core, the high voltage winding of cover in the low voltage winding outside, characterized in that: the number of turns of the high-voltage winding is divided into two parts, namely a phase-shifting winding and a main winding; the front side and the rear side of the upper end of the iron core are provided with upper clamping pieces, and the front upper clamping piece and the rear upper clamping piece are fixed together through bolts; the front side and the rear side of the lower end of the iron core are provided with lower clamping pieces, the front lower clamping piece and the rear lower clamping piece are fixed together through bolts, the upper clamping piece and the lower clamping piece are fixedly connected through a pull rod, and the two ends of the pull rod are provided with threads and are fixed with the upper clamping piece and the lower clamping piece through nuts.
The cross sections of the upper clamp and the lower clamp are C-shaped, a resin insulation cushion block is clamped between the upper end of the winding and the upper clamp, and a resin insulation cushion block is also clamped between the lower end of the winding and the lower clamp; the upper clamping piece and the lower clamping piece are respectively provided with a pressing nail bolt for pressing the insulating cushion block so as to press the winding; the lower clamp is fixed on the base through a supporting block and a bolt, and a base plate is clamped between the lower end of the iron core and the base; and a cooling fan is arranged on the base.
The low-voltage winding adopts a foil winding.
The upper clamping piece is fixedly provided with a plurality of supporting insulators, the phase-to-phase connecting copper bars connected in three phases of the winding are installed on the insulators, the end portions of the phase-to-phase connecting copper bars are connected with the head lead and the tail lead of the winding through binding posts, the head lead and the tail lead also adopt copper bars, and the copper bars are located at the upper end of the winding and are firmly clamped by the insulators.
The high-voltage windings of each twelve-pulse rectifier transformer are connected in a triangular mode; the three-phase main winding of one transformer is connected into a forward triangle, and the head of the main winding is connected with the tail of the phase-shifting winding; the three-phase main winding of the other transformer is connected into a reverse triangle, and the head of the main winding is connected with the tail of the phase-shifting winding; one twelve-pulse rectifier transformer high-voltage winding is shifted with phase by-7.5 degrees, the other twelve-pulse rectifier transformer high-voltage winding is shifted with phase by +7.5 degrees, the phase shift angle is 15 degrees, and the two transformer high-voltage windings are simultaneously connected with a set of rectifier bridges to run in parallel to form a 24-pulse rectifier system.
The foil type +/-7.5-degree phase-shifting transformer structure has the beneficial effects of belonging to the technology for enhancing the harmonic suppression capability of a distribution transformer in the manufacturing work of the transformer and being mainly applied to enhancing the capability of the distribution transformer for suppressing the pollution of harmonic waves to a power grid.
For a large-current transformer, a foil winding is adopted as a low-voltage winding, so that the short-circuit resistance is high, and the mass production is convenient.
The high-voltage winding is changed from 2 to 1, a part of turns of one high-voltage winding is used as a main winding, the rest of turns of one high-voltage winding is used as a phase-shifting winding, and a leading-out copper bar is additionally arranged at the joint of the main winding and the phase-shifting winding, so that the phase-shifting requirement of the high-voltage winding can be met, the connection of an extended triangle of the phase-shifting winding is realized, and the structure is simple.
The foil type +/-7.5-degree phase-shifting transformer structure is applied to all low-voltage foil type transformers, the structure is simplified, and the short-circuit resistance is enhanced.
Drawings
The attached drawing is a structural schematic diagram of the utility model. Fig. 1 is a right half of the front view, and fig. 2 is a right half of the top view. Fig. 3 and 4 are a high-voltage winding wiring diagram and a schematic diagram in sequence. Fig. 5 shows two transformer connections.
In the figure, 1 yoke, 2 bases, 3 cooling fans, 4 nails, 5 upper clamps, 6 insulation cushion blocks, 7 copper bars, 8 alternate connection copper bars, 9 high voltage windings, 10 insulators, 11 binding posts, 12 lower clamps, 13 supporting blocks and 14 backing plates.
Detailed Description
The attached drawing is an embodiment of the utility model.
The foil type +/-7.5-degree phase-shifting transformer structure comprises two twelve-pulse rectifier transformers, wherein a single twelve-pulse rectifier transformer comprises an iron core, a low-voltage winding and a high-voltage winding, wherein the low-voltage winding is sleeved on the iron core, the high-voltage winding 9 is sleeved on the outer side of the low-voltage winding, and the number of turns of the high-voltage winding is divided into two parts, namely a phase-shifting winding and a main winding; the front side and the rear side of an iron yoke 1 at the upper end of the iron core are provided with upper clamping pieces 5, and the front upper clamping piece and the rear upper clamping piece are fixed together through bolts; the front side and the rear side of an iron yoke 1 at the lower end of the iron core are provided with lower clamping pieces 12, the front lower clamping piece and the rear lower clamping piece are fixed together through bolts, the upper clamping piece and the lower clamping piece are fixedly connected through a pull rod, and the two ends of the pull rod are provided with threads and are fixed with the upper clamping piece and the lower clamping piece through nuts.
The cross sections of the upper clamp 5 and the lower clamp 12 are C-shaped, a resin insulation cushion block 6 is clamped between the upper end of the winding and the upper clamp, and a resin insulation cushion block 6 is also clamped between the lower end of the winding and the lower clamp; the upper clamping piece and the lower clamping piece are respectively provided with a pressing nail bolt 4 for pressing the insulating cushion block so as to press the winding; the lower clamp is fixed on the base 2 through a supporting block 13 and a bolt, and a backing plate 14 is clamped between the lower end of the iron core and the base; the base is provided with a cooling fan 3. The insulating cushion block 6 is made of resin.
The low-voltage winding adopts a foil winding.
A plurality of supporting insulators 10 are fixed on the upper clamping piece, phase-to-phase connection copper bars 8 connected in three phases of the winding are installed on the insulators, the end portions of the phase-to-phase connection copper bars are connected with a head lead and a tail lead of the winding through binding posts 11, the head lead and the tail lead also adopt copper bars 7, and the copper bars are located at the upper end of the winding and are firmly clamped by the insulators.
The high-voltage windings of each twelve-pulse rectifier transformer are connected in a triangular mode; three-phase high-voltage main windings 1AZ, 1BZ and 1CZ of a transformer T1 are connected into a forward triangle, and the first ends 1A, 1B and 1C of the main windings are connected with the tail ends of phase-shifting windings 1AY, 1BY and 1 CY; the three-phase high-voltage main windings 2AZ, 2BZ and 2CZ of the other transformer T2 are connected into a reverse triangle, and the head ends 2A, 2B and 2C of the main windings are connected with the tail ends of the phase-shifting windings 2AY, 2BY and 2 CY; one twelve-pulse rectifier transformer high-voltage winding is shifted with phase by-7.5 degrees, the other twelve-pulse rectifier transformer high-voltage winding is shifted with phase by +7.5 degrees, the phase shift angle is 15 degrees, and the two transformer high-voltage windings are simultaneously connected with a set of rectifier bridges to run in parallel to form a 24-pulse rectifier system.
The tail ends of three-phase high-voltage main windings 1AZ, 1BZ and 1CZ of the transformer T1 are X, Y, Z respectively. The tail ends of three-phase high-voltage main windings 2AZ, 2BZ and 2CZ of the transformer T2 are X, Y, Z respectively.
The leading ends A, B, C of the phase shift windings form an extended triangle. The number of the high-voltage windings is changed from 2 to 1, and the connection of the high-voltage phase-shift winding with the extended triangle is realized by adding the leading-out copper bar at the connection part of the main winding and the phase-shift winding, so that the structure is simplified, and the short-circuit resistance is enhanced.
And determining the number of phase-shifting turns by voltage calculation of the extended triangular phase-shifting winding and the main winding. Then, firm lead copper bars are pre-buried in the low-voltage foil type windings, the connection of the high-voltage phase-shifting windings with the edge-extending triangles is realized by adding the lead copper bars, the two transformer high-voltage windings respectively shift phases by a phase angle alpha of +7.5 degrees and a phase angle alpha of-7.5 degrees by adopting the structure, and the two transformer high-voltage windings are connected in parallel to form a 24-pulse rectification system.
Foil windings are used for low voltages. The low-voltage windings of the two independent transformers 1T and 2T are in delta connection (D connection) and/or star connection (Y connection), and the low-voltage windings of the two transformers are connected in parallel for output.
Claims (5)
1. The utility model provides a foil formula phase-shifting transformer structure, includes two twelve pulse wave rectifier transformers, and single twelve pulse wave rectifier transformer includes the iron core, the low voltage winding of cover on the iron core, the high voltage winding of cover in the low voltage winding outside, characterized in that: the number of turns of the high-voltage winding is divided into two parts, namely a phase-shifting winding and a main winding; the front side and the rear side of the upper end of the iron core are provided with upper clamping pieces, and the front upper clamping piece and the rear upper clamping piece are fixed together through bolts; the front side and the rear side of the lower end of the iron core are provided with lower clamping pieces, the front lower clamping piece and the rear lower clamping piece are fixed together through bolts, the upper clamping piece and the lower clamping piece are fixedly connected through a pull rod, and the two ends of the pull rod are provided with threads and are fixed with the upper clamping piece and the lower clamping piece through nuts.
2. The foil-type phase-shifting transformer structure of claim 1, wherein: the cross sections of the upper clamp and the lower clamp are C-shaped, a resin insulation cushion block is clamped between the upper end of the winding and the upper clamp, and a resin insulation cushion block is also clamped between the lower end of the winding and the lower clamp; the upper clamping piece and the lower clamping piece are respectively provided with a pressing nail bolt for pressing the insulating cushion block so as to press the winding; the lower clamp is fixed on the base through a supporting block and a bolt, and a base plate is clamped between the lower end of the iron core and the base; and a cooling fan is arranged on the base.
3. The foil-type phase-shifting transformer structure according to claim 1 or 2, wherein: the low-voltage winding adopts a foil winding.
4. The foil-type phase-shifting transformer structure according to claim 1 or 2, wherein: the upper clamping piece is fixedly provided with a plurality of supporting insulators, the phase-to-phase connecting copper bars connected in three phases of the winding are installed on the insulators, the end portions of the phase-to-phase connecting copper bars are connected with the head lead and the tail lead of the winding through binding posts, the head lead and the tail lead also adopt copper bars, and the copper bars are located at the upper end of the winding and are firmly clamped by the insulators.
5. The foil-type phase-shifting transformer structure according to claim 1 or 2, wherein: the high-voltage windings of each twelve-pulse rectifier transformer are connected in a triangular mode; the three-phase main winding of one transformer is connected into a forward triangle, and the head of the main winding is connected with the tail of the phase-shifting winding; the three-phase main winding of the other transformer is connected into a reverse triangle, and the head of the main winding is connected with the tail of the phase-shifting winding; one twelve-pulse-wave rectifier transformer high-voltage winding shifts the phase to-7.5 degrees, the other twelve-pulse-wave rectifier transformer high-voltage winding shifts the phase to +7.5 degrees, the phase shift angle is 15 degrees, and the two transformer high-voltage windings are simultaneously connected with a set of rectifier bridges to run in parallel to form a 24-pulse rectifier system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220863869.9U CN217035360U (en) | 2022-04-14 | 2022-04-14 | Foil type phase-shifting transformer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220863869.9U CN217035360U (en) | 2022-04-14 | 2022-04-14 | Foil type phase-shifting transformer structure |
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| Publication Number | Publication Date |
|---|---|
| CN217035360U true CN217035360U (en) | 2022-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220863869.9U Active CN217035360U (en) | 2022-04-14 | 2022-04-14 | Foil type phase-shifting transformer structure |
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| Country | Link |
|---|---|
| CN (1) | CN217035360U (en) |
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2022
- 2022-04-14 CN CN202220863869.9U patent/CN217035360U/en active Active
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