CN217035360U - A foil-type phase-shifting transformer structure - Google Patents

Abstract

The structure of the foil-type phase-shifting transformer of the utility model comprises two twelve-pulse rectifier transformers, and 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 outside the low-voltage winding. , which is characterized in that: the number of turns of the high-voltage winding is divided into two parts: the phase-shift winding and the main winding; upper clips are installed on the front and rear sides of the upper end of the iron core, and the front and rear upper clips are fixed together by bolts; The clips, the front and rear lower clips are also fixed together by bolts, the upper clip and the lower clip are fixedly connected through a pull rod, and the two ends of the pull rod are threaded, and are fixed with the upper and lower clips through nuts. The utility model has the advantages of simple structure and strong anti-short-circuit ability, and is mainly used for enhancing the ability of the distribution transformer to restrain the pollution of the power grid caused by harmonics.

Description

A foil-type phase-shifting transformer structure

technical field

The utility model relates to a foil-type phase-shifting transformer structure, which belongs to the field of phase-shifting transformers.

Background technique

With the rapid development of the industry, the demand for rectifier equipment is increasing. At the same time, a large number of harmonics generated by the rectifier system also seriously pollute the power grid. Therefore, the harmonic pollution must be suppressed in the rectifier system. The use of phase-shift rectifier transformers can effectively eliminate frequency conversion. pollution of the power grid.

SUMMARY OF THE INVENTION

In order to make up for the deficiencies of the prior art, the utility model provides a foil-type phase-shifting transformer structure with simple structure and strong short-circuit resistance.

The utility model is achieved through the following technical solutions:

A foil-type phase-shifting transformer structure includes two twelve-pulse rectifier transformers, a single twelve-pulse rectifier transformer includes an iron core, a low-voltage winding sleeved on the iron core, and a high-voltage winding sleeved on the outside of the low-voltage winding. The characteristics are: the number of turns of the high-voltage winding is divided into two parts: the phase-shift winding and the main winding; the upper clips are installed on the front and rear sides of the upper end of the iron core, and the front and rear upper clips are fixed together by bolts; the lower clips are installed on the front and rear sides of the iron core. , the front and rear lower clips are also fixed together by bolts, the upper clip and the lower clip are fixedly connected through a pull rod, the two ends of the pull rod are threaded, and are fixed with the upper and lower clips through nuts.

The cross-section of the upper and lower clamps is C-shaped, a resin insulating spacer is sandwiched between the upper end of the winding and the upper clamp, and a resin insulating spacer is also clamped between the lower end of the winding and the lower clamp; pressure nails are installed on the upper and lower clamps respectively Bolts are used to compress the insulating spacer block, thereby compressing the winding; the lower clamp is fixed on the base through the support block and the bolt, and a spacer plate is clamped between the lower end of the iron core and the base; a cooling fan is installed on the base.

The low voltage winding adopts foil winding.

A number of supporting insulators are fixed on the upper clip. The interphase connection copper bars for the three-phase connection of the windings are installed on the insulators. And the tail lead also uses copper bars, which are located on the upper end of the winding and firmly clamped with insulators.

The high-voltage windings of each twelve-pulse rectifier transformer are connected in a delta; the three-phase main windings of one transformer are connected in a forward delta, and the head of the main winding is connected to the tail of the phase-shifting winding; the three-phase main winding of the other transformer is connected The windings are connected in a reverse triangle, and the head of the main winding is connected to the tail of the phase-shifting winding; the high-voltage winding of a twelve-pulse rectifier transformer is phase-shifted by -7.5°, and the high-voltage winding of the other twelve-pulse rectifier transformer is phase-shifted by +7.5 °, the phase shift angle is 15°, and the high-voltage windings of two transformers are connected to a group of rectifier bridges and run in parallel to form a 24-pulse rectifier system.

The beneficial effect of the utility model is that the foil type ±7.5° phase-shifting transformer structure belongs to the technology of enhancing the harmonic suppression capability of the distribution transformer in the transformer manufacturing work, and is mainly applied to enhance the distribution transformer's capability of suppressing the harmonic pollution to the power grid.

For high-current transformers, the low-voltage winding adopts foil winding, which has strong short-circuit resistance and is convenient for mass production.

The high-voltage winding is changed from the existing two to one. A part of the turns of a high-voltage winding is used as the main winding, and the remaining turns are used as the phase-shifting winding. The connection between the main winding and the phase-shifting winding is added. The phase-shifting requirements of the windings are realized, and the connection of the phase-shifting windings in an extended triangle is realized, and the structure is simple.

Foil-type ±7.5º phase-shifting transformer structure, applied to all low-voltage foil-type transformers, to simplify the structure and enhance the short-circuit resistance.

Description of drawings

The accompanying drawing is a schematic structural diagram of the utility model. Figure 1 is the right half of the main view, and Figure 2 is the right half of the top view. Figure 3 and Figure 4 are the wiring diagram and schematic diagram of the high-voltage winding in turn. Figure 5 shows the connection of two transformers.

In the figure, 1 iron yoke, 2 base, 3 cooling fan, 4 pressure nail bolts, 5 upper clamps, 6 insulating spacers, 7 copper bars, 8 phase-to-phase connecting copper bars, 9 high-voltage windings, 10 insulators, 11 terminals, 12 lower clamps, 13 support blocks, 14 pads.

Detailed ways

The accompanying drawing is an embodiment of the utility model.

The foil type ±7.5° phase-shifting transformer structure of the utility model comprises two twelve-pulse rectifier transformers, a single twelve-pulse rectifier transformer comprises an iron core, and a low-voltage winding sleeved on the iron core is sleeved on the outside of the low-voltage winding The number of turns of the high-voltage winding is divided into two parts: the phase-shift winding and the main winding; the upper iron yoke 1 at the upper end of the iron core is installed with upper clips 5 on the front and rear sides, and the front and rear upper clips are fixed together by bolts; The lower clips 12 are installed on the front and rear sides of the yoke 1. The front and rear lower clips are also fixed together by bolts. The upper clip and the lower clip are fixedly connected by a pull rod.

The cross section of the upper clip 5 and the lower clip 12 is C-shaped, a resin insulating spacer 6 is sandwiched between the upper end of the winding and the upper clip, and a resin insulating spacer 6 is also sandwiched between the lower end of the winding and the lower clip; The clamps are respectively installed with pressure nail bolts 4, which are used to compress the insulating spacer blocks, thereby compressing the windings; the lower clamps are fixed on the base 2 through the support block 13 and the bolts, and a cushion plate is sandwiched between the lower end of the iron core and the base 14; A cooling fan 3 is installed on the base. The insulating spacer 6 is a resin insulating spacer.

The low voltage winding adopts foil winding.

A number of supporting insulators 10 are fixed on the upper clip, the interphase connection copper bars 8 for the three-phase connection of the windings are installed on the insulators, and the ends of the interphase connection copper bars are connected to the head lead and the tail lead of the winding through the terminal 11, The head lead and the tail lead also use copper bar 7, and the copper bar is located on the upper end of the winding and is firmly clamped with an insulator.

The high-voltage windings of each twelve-pulse rectifier transformer are connected in delta; the three-phase high-voltage main windings 1AZ, 1BZ and 1CZ of a transformer T1 are connected to form a forward delta, and the first ends of the main windings 1A, 1B and 1C are connected to the phase-shifting windings. The tail ends of 1AY, 1BY and 1CY; the three-phase high-voltage main windings 2AZ, 2BZ and 2CZ of the other transformer T2 are connected in a reverse triangle, and the first ends of the main windings 2A, 2B and 2C are connected to the phase-shift windings 2AY, 2BY and 2CY. Tail head; a 12-pulse rectifier transformer high-voltage winding has a phase shift of -7.5°, another 12-pulse rectifier transformer high-voltage winding has a phase shift of +7.5°, and the phase shift angle is 15°. At the same time, a group of rectifier bridges are connected in parallel to form a 24-pulse rectifier system.

The tail ends of the three-phase high-voltage main windings 1AZ, 1BZ, and 1CZ of the transformer T1 are X, Y, and Z, respectively. The tail ends of the three-phase high-voltage main windings 2AZ, 2BZ, and 2CZ of the transformer T2 are X, Y, and Z, respectively.

The heads A, B, and C of the phase-shift winding form an extended triangle. The high-voltage winding is changed from the current two to one. The connection between the main winding and the phase-shifting winding is increased by adding a lead-out copper bar to realize the connection of the high-voltage phase-shifting winding with an extended edge triangle, simplifying the structure and enhancing the short-circuit resistance.

Determine the number of phase-shift turns by calculating the voltage of the extended-side delta phase-shift winding and the main winding. Then, the solid lead copper bars are embedded in the low-voltage foil windings, and by adding the lead-out copper bars, the connection of the high-voltage phase-shifted windings is realized. α, run in parallel to form a 24-pulse rectifier system.

The low voltage uses foil windings. The low-voltage windings of the two independent transformers 1T and 2T are connected in delta (D connection) and/or star connection (Y connection), and the low-voltage windings of the two transformers are output in parallel.

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.

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