JP7288355B2 - Method for assembling a wound core transformer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wound core transformer having a wound core, and to a method of assembling a wound core transformer on site after being disassembled and transported.

When carrying a transformer into a building, the size of the transformer may be larger than the size of the entrance. At this time, each part of the transformer is disassembled, brought in, and assembled on site. This resolution is only possible for molded transformers.

As a method for carrying in disassembled core transformers, a method for disassembling and carrying in core transformers has been established. The disassembled iron core, coils, and metal fittings are separately brought in. As for the assembly process, only the iron core is assembled and erected, then the coil is inserted, the core and metal fittings are assembled, and after inspection, the product is completed.

For example, in Patent Document 1, "A method for assembling a disassembled transported transformer in which transformer parts such as a coil, an iron core consisting of an iron core portion and an iron core yoke portion, etc. are disassembled and brought in and assembled on site, the coil and iron core for each phase are described. A method for assembling a dismantled carried-in transformer, characterized by carrying in a main body base with a core portion mounted in a horizontal position, and combining a core yoke portion with the core portion to form an iron core.” .

JP-A-2000-114056

At present, it is possible to dismantle and bring in on-site transformers with cored cores. However, with the current method, it takes a lot of time to assemble the iron core, and the total number of working days is long.

On the other hand, in the case of a wound core transformer, after delivery, the coil is placed on the workbench, the core is inserted and assembly work is performed. Completed after inspection. In the case of a wound core, on-site assembly work of the core and an assembly workbench are required. At present, there is no actual example of on-site disassembly and delivery of wound cores.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wound core transformer that is suitable for dismantling, transporting and assembling on site, and an assembling method thereof.

In order to solve the above-described problems, the present invention provides a wound core transformer with an insulating plate that also serves as a core assembly workbench between a coil and a core.

An example of the "method for assembling a wound core transformer" of the present invention is a method for assembling a wound core transformer having a wound core and coils arranged on a plurality of legs of the wound core, comprising: a step of arranging a plurality of coils side by side; a plurality of comb tooth portions; and a connecting portion connecting one end of the plurality of comb tooth portions; a step of inserting the comb tooth portions of the core assembly work table combined use insulating plate having thickness strength for mounting the wound iron core into the holes of the plurality of coils respectively; a step of inserting the wound core into the hole of the coil as a workbench to form a wound core transformer having the core assembly workbench and insulating plate between the coil and the wound core. is.

INDUSTRIAL APPLICABILITY According to the wound core transformer of the present invention, it is possible to provide a wound core transformer that is disassembled, carried, and suitable for assembly on site. In addition, it is possible to improve the short-circuit and earthquake resistance of the wound core transformer.

In addition, according to the method of assembling a wound core transformer of the present invention, compared to the method of disassembling and carrying in a stacked core transformer, the work of assembling the core can be simplified, so the number of days for disassembling and carrying in and assembling work at the site can be reduced. It is possible to In addition, it is possible to reduce the cost of disassembly and delivery and to deliver the product as a top-runner application product.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a plan view showing an example of a wound core transformer of Example 1. FIG. FIG. 2 is a cross-sectional view of the wound core transformer of FIG. 1 taken along the line AA; 1. It is a figure which shows the iron core assembly workbench combined insulating plate used for the wound core transformer of FIG. FIG. 4 is a diagram showing a method of assembling the wound core transformer of Example 1; It is a figure which shows the modification of an insulating plate combined with a core assembly workbench. FIG. 10 is a diagram showing another modification of the insulating plate also used as a core assembly workbench; FIG. 10 is a plan view showing an example of a single-phase wound core transformer of Example 2; FIG. 8 is a BB cross-sectional view of the wound core transformer of FIG. 7; FIG. 11 is a diagram showing a part of the method for assembling the wound core transformer of Example 3; FIG. 11 is a diagram showing a part of the method for assembling the wound core transformer of Example 3; FIG. 11 is a view showing an insulating plate that also serves as a core assembly workbench according to Example 4;

Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing for explaining the embodiments, the same components are given the same names and symbols as much as possible, and the repeated description thereof is omitted.

1 shows a plan view of a wound core transformer of Example 1 of the present invention, and FIG. 2 shows a cross-sectional view taken along the line AA of FIG. Example 1 is an example in which the present invention is applied to a three-phase tripod transformer.

The core 2 is composed of two inner cores 2a ₁ and 2a ₂ arranged adjacent to each other and an outer core 2b surrounding the two inner cores 2a ₁ and 2a ₂ . A primary coil 3 and a secondary coil 4 are provided on the three legs of the iron core 2, respectively, to form a three-phase tripod transformer.

In the holes of the coils 3 and 4, an insulating plate 1 that also serves as a core assembly workbench is provided. FIG. 3 shows an example of an insulating plate that also serves as a core assembly workbench. The core assembly workbench/insulating plate 1 includes a plurality of comb tooth portions 1a to be inserted into coil hole portions, and a connection portion 1b for connecting one ends of the plurality of comb tooth portions 1a, and is composed of an insulating plate. there is The insulating plate 1 also used as a core assembly workbench has an E shape, and as shown in FIG. Insulating plate 1 also used as a workbench for core assembly has a thickness and strength that enables the core 2 to be placed thereon.

In the assembly of a wound core transformer, when inserting the core into the coil, work is performed using a dedicated lapping workbench equipped with a height adjuster for matching the heights of the core and coil. However, in the case of on-site disassembly and delivery, it is difficult to bring a dedicated workbench to the site. Therefore, in the present invention, the assembly workbench is simplified by using the insulating plate 1 also used as the core assembly workbench. Furthermore, by inserting the insulating plate between the coil and the iron core, the inner circumference of the coil is prevented from being damaged.

FIG. 4 shows a method of assembling the wound core transformer of Example 1 using the insulating plate 1 also used as a core assembly workbench. First, as shown in FIG. 4( a ), three coils 3 are arranged side by side on the workbench 6 for carrying in disassembly. Next, as shown in FIG. 4(b), the comb-toothed portions of the insulating plate 1 also used as a workbench for core assembly are inserted into the holes of the three coils 3, respectively. Next, as shown in FIG. 4(c), the wound core 2 with one end open is placed on the upper surface of the core assembly workbench/insulating plate 1, inserted into the hole of the coil, and the opened wound core One end is overlapped to form a wound core. The connecting portion 1b on the near side of the insulating plate 1 that also serves as a core assembly workbench serves as a lapping workbench for placing the core 2 first.

1 to 3, the transformer of this embodiment comprises a first inner core _2a1 , a second inner core _2a2 arranged in the first inner core, and the first inner core and the outer core 2b arranged to cover the second inner core, the first coil ₃₁ wound around the first inner core and the outer core, and the first inner core A transformer having a second coil ₃₂ wound around the second inner core and a third coil ₃₃ wound around the second inner core and the outer core, A first plate-shaped member (comb tooth portion _{1a 1} ) longer than the height of the first coil is arranged between the inner side of the first coil 31 and the first inner core and the outer core. A _second plate-like member (comb-teeth part 1a ₂ ) is arranged, and a _third plate-shaped member (comb The first plate-like member (comb tooth portion _{1a 1 )} and the second plate-like member (comb tooth portion 1a ₂ ) are positioned lower or higher than the first coil. It has a first connection portion (connection portion 1b ₁ ) to be connected, and the second plate-like member (comb tooth portion 1a ₂ ) and the third plate-like member (comb tooth portion 1a ₃ ) are connected to the first It has a second connecting portion (connecting portion 1b ₂ ) connected at a position lower or higher than the two coils.

In addition, the first plate-shaped member (comb tooth portion 1a ₁ ), the second plate-shaped member (comb tooth portion 1a ₂ ), the third plate-shaped member (comb tooth portion 1a ₃ ), the first The connecting portion (connecting portion 1b ₁ ) and the second connecting portion (connecting portion 1b ₂ ) are arranged on the front side of the transformer. Among the first plate-like member (comb tooth portion 1a ₁ ), the second plate-like member (comb tooth portion 1a ₂ ) and the third plate-like member (comb tooth portion 1a ₃ ), An end face to which the one connection portion (connection portion 1b ₁ ) or the second connection portion (connection portion 1b ₂ ) is not connected is an open end. In addition, the first plate-shaped member (comb tooth portion 1a ₁ ), the second plate-shaped member (comb tooth portion 1a ₂ ), the third plate-shaped member (comb tooth portion 1a ₃ ), the first The connecting portion (connecting portion 1b ₁ ) and the second connecting portion (connecting portion 1b ₂ ) are connected in an E shape.

According to the wound core transformer of the present embodiment, by providing the insulating plate 1 also used as a core assembly workbench, it is possible to provide a wound core transformer suitable for disassembly and carrying in and assembling on site. In addition, since an insulating plate is provided between the coil and the iron core, it is possible to prevent the inner circumference of the coil from being damaged and strengthen the insulation. can.

In addition, according to the method of assembling the wound core transformer of the present embodiment, compared with the method of disassembling and carrying in the stacked core transformer, the work of assembling the core can be simplified. can be reduced. In addition, it is possible to reduce the cost of disassembly and delivery and to deliver the product as a top-runner application product.

FIG. 5 shows a modification of the core assembly workbench/insulating plate of the present embodiment. In this modification, the tip of the comb tooth portion 1a of the insulation plate also used as a workbench for the core assembly is rounded 1c. By rounding the ends of the comb teeth 1c, the coil can be prevented from being damaged.

FIG. 6 shows another modification of the core assembly workbench/insulating plate of the present embodiment. In this modification, the tip of the comb tooth portion 1a of the insulating plate also used as a workbench for core assembly is sharpened to provide a tapered portion 1d. By providing the tapered portion 1d at the tip of the comb tooth portion, insertion into the coil can be facilitated.

FIG. 7 shows a plan view of a wound core transformer of Example 2 of the present invention, and FIG. 8 shows a cross-sectional view taken along line BB of FIG. A second embodiment is an example in which the present invention is applied to a single-phase transformer.

A primary coil 3 and a secondary coil 4 are provided on the two legs of the iron core 2, respectively, to form a single-phase transformer. In the holes of the coils 3 and 4, an insulating plate 1 that also serves as a core assembly workbench is provided. As in the first embodiment, the core assembly workbench/insulating plate 1 includes a plurality of comb tooth portions 1a to be inserted into coil holes, and a connection portion 1b for connecting one ends of the plurality of comb tooth portions 1a. , and an insulating plate. In this embodiment, the insulating plate 1 also used as a core assembly workbench has a U shape, and the size of the insulating plate 1 also used as a core assembly workbench is approximately the size of the core in a plane as shown in FIG. It is. Insulating plate 1 also used as a workbench for core assembly has a thickness and strength that enables the core 2 to be placed thereon.

According to the single-phase wound core transformer of the present embodiment, as in the first embodiment, by providing the insulating plate 1 also serving as a core assembly workbench, the wound core transformer is suitable for disassembly and carrying and assembling on site. can be provided. In addition, since an insulating plate is provided between the coil and the iron core, it is possible to prevent the inner circumference of the coil from being damaged and strengthen the insulation. can.

9 and 10 show part of the method for assembling the wound core transformer of the third embodiment. Example 3 is a method of erecting a wound core transformer after assembling the wound core transformer on a workbench.

In FIG. 9, on the workbench 6, the core is inserted into the coil 3, and after the core is wrapped, the upper fastener 9 and the lower fastener 10 are attached. Then, when erecting the transformer, the workbench 6 and the transformer overturn prevention base 7 are fixed as shown in the figure.

Then, as shown in FIG. 10(a), a hoisting tool 8 is attached to one end of the workbench 6 and one end of the transformer overturn prevention base 7, and the hoisting tool 8 is attached to the crane. As shown in FIG. 10(b), the transformer is gradually raised by pulling up the hoisting tool 8 on the workbench 6 side and lowering the hoisting tool 8 on the transformer overturn prevention base 7 side. Then, as shown in FIG. 10(c), the work is completed when the transformer stands upright. When the transformer is to be dismantled and brought in, for example, a simple crane that can be disassembled and moved may be used.

According to this embodiment, the transformer can be prevented from falling over by fixing the workbench and the product base and erecting the transformer. In addition, it is easy to dismantle the transformer, bring it in, and assemble it on site.

11A and 11B show a core assembly workbench and insulating plate according to a fourth embodiment of the present invention, FIG. 11(a) showing a plan view and FIG. 11(b) showing a right side view.

As shown in the figure, the core assembly workbench/insulation plate 1 of this embodiment has a large thickness at the connecting portion 1b, which is the root portion, and the thickness gradually decreases toward the tip of the comb tooth portion. In the core assembly workbench/insulation plate 1 of the present embodiment, as in the first embodiment, the comb teeth of the core assembly workbench/insulation plate are inserted into the holes of the coils arranged side by side on the workbench. Then, the wound core with one end open is placed on the upper surface of the core assembly workbench/insulating plate, inserted into the hole of the coil, and the open ends of the wound core are overlapped to form the wound core.

According to the core assembly workbench/insulating plate of the present embodiment, the thickness gradually decreases toward the tip of the comb tooth portion 1a, so that it can be easily inserted into the coil of the core. In addition, since the thickness of the insulating plate is thicker at the root portion, it can be expected to act as a wedge to fix the coil and the iron core.

Reference Signs List 1... Insulating plate 1a...Comb tooth part 1b...Connecting part 1c...Roundness 1d...Taper part 2...Wound core 2a...Inner core 2b...Outer core 3...Primary coil 4...Secondary coil 6...Disassembled and carried Workbench 7...Base for transformer fall prevention 8...Hanging tool 9...Upper fastener 10...Lower fastener

Claims (9)

A method for assembling a wound core transformer having a wound core and coils arranged on a plurality of legs of the wound core, comprising:
arranging a plurality of coils side by side on a workbench;
It has a plurality of comb tooth portions and a connection portion connecting one end of the plurality of comb tooth portions, the size in a plane is approximately the size of the wound core, and the thickness strength is provided for mounting the wound core. a step of inserting the comb tooth portions of the core assembly workbench and insulating plate into the holes of the plurality of coils;
A wound core transformer in which the wound core is inserted into the hole of the coil using the core assembly work table and insulating plate as a work table, and the wound core transformer has the core assembly work table and insulating plate between the coil and the wound core. forming a
A method for assembling a wound core transformer. The method for assembling a wound core transformer according to claim 1 , further comprising:
A method for assembling a wound core transformer, comprising a step of integrating a workbench and the transformer after assembling the wound core, and erecting the transformer with a lifting tool. In the method for assembling a wound core transformer according to claim 1 ,
Wound core transformers are disassembled into a wound core and multiple coils, brought in, and assembled on-site. In the method for assembling a wound core transformer according to claim 1,
A method for assembling a wound core transformer, wherein the other end of the comb tooth portion of the insulating plate also used as a workbench for core assembly is an open end, the other end being opposite to the connecting portion. In the method for assembling a wound core transformer according to claim 1,
The wound core is composed of two inner cores and an outer core surrounding the two inner cores,
The coils are arranged on three legs of the wound core,
A method for assembling a wound core transformer, wherein the insulating plate also used as a core assembly workbench has an E shape in which the comb teeth are inserted into the holes of the three coils. In the method for assembling a wound core transformer according to claim 1,
The wound core is composed of one wound core,
The coils are arranged on two legs of the one wound core,
A method for assembling a wound core transformer, wherein the insulation plate also used as a core assembly workbench has a U-shape in which the comb teeth are inserted into the holes of the two coils. In the method for assembling a wound core transformer according to claim 1,
A method for assembling a wound core transformer, characterized in that the ends of the comb teeth of the insulating plate also used as a core assembly workbench are rounded. In the method for assembling a wound core transformer according to claim 1,
A method for assembling a wound core transformer, wherein a tapered portion is provided at a distal end of the comb tooth portion of the insulating plate also used as a core assembly workbench. In the method for assembling a wound core transformer according to claim 1,
A method for assembling a wound core transformer, wherein the thickness of the insulating plate also used as a workbench for core assembly is large at the root portion and gradually decreases toward the tip of the comb tooth portion.

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