Combined Scott dry-type transformer iron core structure

Abstract

The combined Scott dry-type transformer iron core structure comprises two independent single-phase transformer iron cores, namely a T transformer iron core and an M transformer iron core, and the two rectangular iron cores are fixed together side by side at a certain interval; front and rear upper clamping pieces are installed on an upper yoke of the T-transformer iron core, front and rear lower clamping pieces are installed on a lower yoke of the T-transformer iron core, the front and rear upper clamping pieces are fixed together through side screws so as to clamp the upper yoke, and the front and rear lower clamping pieces are fixed together through side screws so as to clamp the lower yoke. The M transformer iron core is also provided with an upper clamping piece, a lower clamping piece and a side screw rod; the right ends of the upper and lower clamping pieces of the T-transformer iron core are welded with a connecting support plate, the left ends of the upper and lower clamping pieces of the M-transformer iron core are welded with a connecting support plate, and the connecting support plates of the T-transformer iron core and the M-transformer iron core are fixed together through a connecting bolt, so that the T-transformer iron core and the M-transformer iron core are fixed into a whole. The four iron core columns are the same, so that processing and assembling are facilitated. The transformer is divided into two independent single-phase transformers, so that heat concentration is avoided, heat dissipation is facilitated, and fault loss is reduced.

Description

Technical Field

[0001] The utility model relates to a combined Scott dry-type transformer core structure, belonging to the technical field of dry-type transformer manufacturing. Background Art

[0002] Scott transformers are widely used in electric railways and dual-inductor core induction furnaces. They can solve the problem of powering single-phase loads from three-phase power. Epoxy resin cast dry Scott wiring transformers are valued and promoted for their maintenance-free, energy-saving, high reliability, pollution-free, flame-retardant, fire-proof, good mechanical strength and strong short-circuit resistance. Existing Scott dry transformers have poor heat dissipation, fault loss between two single-phase transformers, and poor stability. The core assembly is complex and the short-circuit resistance is insufficient. Summary of the invention

[0003] The utility model provides a combined Scott dry-type transformer core structure to make up for the deficiencies of the prior art.

[0004] The technical solution of the utility model is as follows:

[0005] The utility model provides a combined Scott dry-type transformer core structure, comprising two independent single-phase transformer cores, namely a T transformer core and an M transformer core. The two rectangular cores are fixed side by side at a certain distance and arranged in a housing. The cores are arranged in parallel, which is conducive to heat dissipation.

[0006] Two cores form four core columns arranged in a row;

[0007] The upper iron yoke of the T-type transformer core is installed with front and rear upper clamps, and the lower iron yoke is installed with front and rear lower clamps. The front and rear upper clamps are fixed together by side screws to clamp the upper iron yoke, and the front and rear lower clamps are fixed together by side screws to clamp the lower iron yoke. The upper and lower clamps of the T-type transformer core and the upper and lower clamps of the M-type transformer core are respectively made of channel steel. The M-type transformer core is also installed with upper clamps, lower clamps, and side screws.

[0008] The right ends of the upper and lower clamps of the T transformer core are welded with a connecting support plate, and the left ends of the upper and lower clamps of the M transformer core are welded with a connecting support plate. The connecting support plates of the two are fixed together by connecting bolts, thereby fixing the T transformer core and the M transformer core as a whole.

[0009] Further preferably, a pull plate is connected between the upper clamp and the lower clamp, and a pull plate insulating pad is placed between the pull plate and the core column; the core column is a cylindrical column made of stacked silicon steel sheets and is tied with a non-weft binding tape, and the outside of the core column is wrapped with SHS prepreg cloth, and the non-weft binding tape is tied to the outside of the SHS prepreg cloth to protect the binding tape from being damaged by the edges and corners of the core.

[0010] Further preferably, a plurality of ear plates are welded to the lower part of the upper clamp, and a plurality of ear plates are also welded to the upper part of the lower clamp. The ear plates have bolt holes for installing pull plates by screws, or for installing insulating pressure blocks by screws to tighten the transformer coil.

[0011] Further preferably, a grounding sheet and / or a grounding bolt is installed on the upper clamp or the lower clamp.

[0012] Further preferably, a reinforcing plate is welded on the inner side of the upper clamp and the lower clamp at the installation side screw;

[0013] A base bracket is fixed at the lower end of the lower clamp, and the base brackets of the front and rear lower clamps are fixedly connected together through the lower bottom plate;

[0014] A number of lifting noses are welded on the upper end of the upper clamp for lifting and carrying the iron core or transformer.

[0015] Further preferably, a clamp is installed on the upper clamp near the middle of the upper iron yoke, and a clamp pull strap is connected between the front and rear upper clamps for tightening the upper iron yoke; a clamp and a clamp pull strap are also installed on the lower clamp for tightening the lower iron yoke.

[0016] The beneficial effects of the utility model are that the combined Scott dry-type transformer core structure is adopted, the operation and processing are simple, the four core columns are the same, which is conducive to processing and assembly, and the combined structure avoids heat concentration because the transformer is divided into two independent single-phase transformers, which is conducive to the heat dissipation of the transformer, and the combined structure can reduce the influence between the two single-phase transformers, reduce fault losses, improve the mechanical properties and short-circuit resistance of the winding, and improve the performance of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawing is a schematic structural diagram of the utility model. Figure 1 Core front view, Figure 2 Core top view, Figure 3 Using state diagram (transformer body).

[0018] In the figure, 1 is the upper clamp of T transformer, 2 is the lower clamp of T transformer, 3 is the bottom plate bracket, 4 is the nose, 5 is the clamp, 6 is the connecting support plate, 7 is the connecting bolt, 8 is the upper clamp of M transformer, 9 is the SHS prepreg cloth, 10 is the weftless binding belt, 11 is the pull plate insulation pad, 12 is the pull plate, 13 is the lower clamp of M transformer, 14 is the bottom plate, 15 is the side screw, 16 is the grounding plate, 17 is the reinforcement plate, 18 is the grounding bolt, 19 is the clamp and the pull belt, 20 is the ear plate, 21 is the iron core of M transformer, 22 is the iron core of T transformer. 23 is the insulating block, 24 is the transformer coil, 25 is the cooling fan. DETAILED DESCRIPTION

[0019] The accompanying drawing shows an embodiment of the present utility model.

[0020] The combined Scott dry-type transformer core structure of the utility model comprises two independent single-phase transformer cores, namely, a T-type transformer core 22 and an M-type transformer core 21. The two rectangular cores are fixed side by side at a certain distance and arranged in a housing. The cores are arranged in parallel to facilitate heat dissipation.

[0021] Two cores form four core columns arranged in a row;

[0022] The upper iron yoke of the T-type transformer core is installed with front and rear upper clamps 1, and the lower iron yoke is installed with front and rear lower clamps 2. The front and rear upper clamps are fixed together by side screws 15 to clamp the upper iron yoke, and the front and rear lower clamps are fixed together by side screws 15 to clamp the lower iron yoke; the upper and lower clamps of the T-type transformer core and the upper and lower clamps of the M-type transformer core are respectively made of channel steel; the M-type transformer core is also installed with upper clamps 8, lower clamps 13, and side screws;

[0023] The right ends of the upper and lower clamps of the T transformer core are welded with a connecting support plate 6, and the left ends of the upper and lower clamps of the M transformer core are welded with a connecting support plate 6. The connecting support plates of the two are fixed together by connecting bolts 7, thereby fixing the T transformer core 22 and the M transformer core 21 as a whole.

[0024] A pull plate 12 is connected between the upper clamp and the lower clamp, and a pull plate insulating pad 11 is placed between the pull plate and the core column; the core column is a cylindrical column made of stacked silicon steel sheets and is tied with a non-weft binding tape 10. The outside of the core column is wrapped with SHS prepreg cloth 9, and the non-weft binding tape is tied to the outside of the SHS prepreg cloth to prevent the protective binding tape from being damaged by the edges and corners of the core.

[0025] A plurality of ear plates 20 are welded to the lower part of the upper clamp, and a plurality of ear plates 20 are also welded to the upper part of the lower clamp. The ear plates have bolt holes for installing the pull plate 12 by screws, or for installing the insulating pressing block 23 by screws to compress the transformer coil 24.

[0026] A grounding sheet 16 and / or a grounding bolt 18 are mounted on the upper clamp or the lower clamp.

[0027] A reinforcing plate 17 is welded on the inner side of the upper clamp and the lower clamp at the installation side screw;

[0028] A base bracket 3 is fixed to the lower end of the lower clamp, and the base brackets of the front and rear lower clamps are fixedly connected together through the lower bottom plate 14;

[0029] A plurality of lifting noses 4 are welded on the upper end of the upper clamping piece for lifting and carrying the iron core or the transformer.

[0030] A clamp 5 is installed on the upper clamp near the middle of the upper iron yoke, and a clamp strap 19 is connected between the front and rear upper clamps for tightening the upper iron yoke; a clamp and a clamp strap are also installed on the lower clamp for tightening the lower iron yoke.

[0031] The combined Scott dry-type transformer core structure is composed of two independent single-phase transformer core structures. The two transformer cores are fixed together by bolts through upper and lower clamps and arranged in a shell. A base is set at the bottom of the shell. The two cores are fixed on the base and fixed on the bottom plate of the shell.

[0032] SHS prepreg is a soft composite material made of polyimide film coated with H-grade adhesive and polyester fiber non-woven fabric, which is then impregnated with epoxy prepreg semi-cured resin to become a reliable thermal adhesive material. It has excellent dielectric properties, bonding properties and heat resistance, and is an ideal interlayer insulation material and ground insulation material for H-class dry-type transformers. The heat resistance grade is H-class (180℃). It is suitable for H-class dry-type transformer coil interlayer insulation, end seal insulation and ground insulation, motor turn insulation, etc.

[0033] The combined Scott dry-type transformer core structure belongs to the technology of transformer three-phase to two-phase balanced load, and is mainly used in the occasion where two single-phase loads are equal.

[0034] Practice has proved that the combined Scott dry-type transformer core structure is simple to operate and process. The four core columns are the same, which is conducive to processing and assembly. The combined structure avoids heat concentration and is conducive to the heat dissipation of the transformer because the transformer is divided into two independent single-phase transformers. Moreover, the combined structure can reduce the influence between the two single-phase transformers, reduce fault losses, improve the mechanical properties and short-circuit resistance of the winding, and improve the performance of the transformer.

Claims

1. A combined Scott dry-type transformer core structure, characterized by: It comprises two independent single-phase transformer cores, namely a T transformer core (22) and an M transformer core (21), the two rectangular cores are fixed side by side at a certain distance and arranged in a housing, and the cores are arranged in parallel to facilitate heat dissipation; Two iron cores form four core columns arranged in a row; The upper iron yoke of the T-type transformer core is installed with front and rear upper clamps (1), and the lower iron yoke is installed with front and rear lower clamps (2). The front and rear upper clamps are fixed together by side screws (15) to clamp the upper iron yoke. The front and rear lower clamps are fixed together by side screws (15) to clamp the lower iron yoke. The upper and lower clamps of the T-type transformer core and the upper and lower clamps of the M-type transformer core are respectively made of channel steel. The M-type transformer core is also installed with an M-type upper clamp (8), an M-type lower clamp (13), and side screws. The right ends of the upper and lower clamps of the T-transformer core are welded with a connecting support plate (6), and the left ends of the upper and lower clamps of the M-transformer core are welded with a connecting support plate (6). The connecting support plates of the two are fixed together by connecting bolts (7), thereby fixing the T-transformer core (22) and the M-transformer core (21) into a whole.

2. The combined Scott dry-type transformer core structure according to claim 1 is characterized by: A pull plate (12) is connected between the upper clamp and the lower clamp, and a pull plate insulating pad (11) is placed between the pull plate and the core column; the core column is cylindrical and made of laminated silicon steel sheets and is fastened with a non-weft binding tape (10); the outer side of the core column is wrapped with a prepreg cloth (9), and the non-weft binding tape is tied to the outer side of the prepreg cloth.

3. The combined Scott dry-type transformer core structure according to claim 2 is characterized by: A plurality of ear plates (20) are welded to the lower part of the upper clamp, and a plurality of ear plates (20) are also welded to the upper part of the lower clamp. The ear plates have bolt holes for mounting the pull plate (12) by screws, or for mounting the insulating pressing block by screws to compress the transformer coil.

4. The combined Scott dry-type transformer core structure according to claim 1 is characterized by: A grounding sheet (16) and / or a grounding bolt (18) is mounted on the upper clamp or the lower clamp.

5. The combined Scott dry-type transformer core structure according to claim 1 is characterized by: A reinforcing plate (17) is welded on the inner side of the upper clamp and the lower clamp at the mounting side screw. A base bracket (3) is fixed at the lower end of the lower clamp, and the base brackets of the front and rear lower clamps are fixedly connected together via a lower bottom plate (14); A plurality of lifting noses (4) are welded on the upper end of the upper clamping piece and are used for lifting and carrying the iron core or the transformer.

6. The combined Scott dry-type transformer core structure according to claim 1 is characterized by: A hoop (5) is installed on the upper clamp near the middle of the upper iron yoke, and a hoop pull strap (19) is connected between the front and rear upper clamps for tightening the upper iron yoke; a hoop and a hoop pull strap are also installed on the lower clamp for tightening the lower iron yoke.

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