JP7160595B2 - Transformer manufacturing method, assembly template - Google Patents

Description

TECHNICAL FIELD Embodiments of the present invention relate to a method of manufacturing a transformer and an assembly template used when assembling the transformer.

Transformers with tap changers housed in tanks are conventionally known. In such a transformer, the tap changer is attached to a wooden frame, for example, and is housed in the tank together with the wooden frame (see Patent Document 1, for example).

JP 2017-147261 A

Now, as in Patent Document 1, a step of assembling a tap changer to a wooden frame to manufacture a wooden unit (hereinafter referred to as a unit assembling step) and a step of assembling a transformer main body (hereinafter referred to as a main body assembling step) are performed. It is considered that the work efficiency can be greatly improved by carrying out in a separate process.

By the way, when the unit assembling process and the main body assembling process are carried out in separate processes, after assembling the wooden unit to the main body of the transformer, the lead wire of the main body of the transformer and the lead wire of the tap changer are connected. A process (hereinafter referred to as a connection process) is required.

However, in the case of a transformer through which a relatively large current flows, lead wires and lead wires that are relatively thick, highly rigid, and difficult to bend are used. Also, the transformer body can be over 2 meters high, for example, if it is a large one.

Therefore, in the connection process, it is necessary to move and arrange the difficult-to-bend lead wires and lead wires around the wooden frame unit. work is also required. As a result, the time spent working at the work place located above the main body of the transformer becomes longer, and it becomes important to ensure the safety of workers. Moreover, not only does the work take a long time, it also tends to take longer than the actual work, such as setting up a safe scaffold around the wooden unit.

Therefore, the present invention provides a transformer manufacturing method capable of shortening working hours at high places and improving safety when assembling a transformer, and an assembly template used when assembling the transformer.

A method for manufacturing a transformer according to an embodiment is a manufacturing method for manufacturing a transformer including a transformer main body and a wooden frame unit to be assembled to the transformer main body. The main body assembly process, which assembles the main body, and the main body assembly process are carried out in separate processes, and the tap changer is assembled to the wooden frame, and the lead wire connected to the lead wire of the transformer main body is arranged to assemble the wooden unit. and a unit assembling step, in which a template in which an identifier indicating the position of the terminal provided on the lead wire is described is used, and the terminal of the lead wire is used before the wooden unit is assembled to the main body of the transformer. is positioned at the position of the terminal provided on the lead wire.

Schematically showing a configuration example of a transformer according to an embodiment The figure which shows an example of a structure of a tap changer typically A diagram schematically showing part of the manufacturing process of a transformer A diagram schematically showing an example of the configuration of a wooden unit A diagram schematically showing an example of a template configuration A diagram schematically showing an example of the configuration of a fixture The figure which shows typically an example of a structure of an assembly conveyance vehicle. A diagram schematically showing an example of the layout of the upper surface of the assembly carrier. A diagram schematically showing another configuration example of a template

Hereinafter, embodiments will be described with reference to the drawings.
As shown in FIG. 1, it is attached to, for example, a transformer 1 as a stationary induction device. The transformer 1 includes a tank 2, a transformer main body 5 having an iron core 3 and a winding 4, a wooden unit 7 having a tap changer 6, and the like. This transformer 1 is a so-called oil-filled transformer in which the inside of the tank 2 is filled with insulating oil (not shown), and the transformer body 5 and the tap changer 6 are accommodated in a state of being immersed in the insulating oil. . A handle 8 for switching the tap position is provided on the outer surface of the tank 2 .

The iron core 3 forming the main body 5 of the transformer is formed by laminating, for example, thin electromagnetic steel sheets, as is well known. In this embodiment, a tripod core having three legs is used as the core 3 . Each leg of the iron core 3 is provided with a winding 4, respectively. These three windings 4 correspond to three phases, U-phase, V-phase and W-phase, respectively.

The windings 4 of each phase are connected to bushings 9 for the high-voltage side and the low-voltage side provided, for example, in the upper portion of the tank 2 . At this time, a part of the winding 4 of each phase is led out as a lead wire 10 and connected via a tap changer 6 connected via a lead wire 11 . In FIG. 1, the illustration of the lead wire 11 connected to the bushing 9 is omitted for simplification of explanation.

As shown in FIG. 2, the tap changer 6 includes a terminal plate 6b provided with six tap terminals 6a corresponding to each phase, and an electrical connection between any two tap terminals 6a of each phase. It has a slide plate 6d provided with three movable contacts 6c connected to. If the six tap terminals 6a of each phase are numbered 1 to 6 in order from the left side, that is, the side opposite to the gear 6e, the terminal plate 6b has the tap terminals 6a from 1 to 6 of each phase. are equally spaced at a predetermined distance from each other. The tap terminals 6a of each layer are arranged so that the distances to the tap terminals 6a of the same number of the other phases are equal, and the three movable contacts 6c are arranged at equal intervals. A shaft 6f is attached to the rotating shaft of the gear 6e, and a handle 8 is connected to the tip of the shaft 6f.

Therefore, when the movable contact 6c corresponding to the U phase is positioned to electrically connect between the first and second tap terminals 6a, the movable contact 6c corresponding to the V phase is also connected to the first and second taps. The movable contact 6c corresponding to the W-phase is also positioned to electrically connect between the terminals 6a and the first and second tap terminals 6a. Although not shown, the tap terminal 6a penetrates the terminal plate 6b, and is electrically connected by the movable contact 6c at a portion protruding toward the rear side of the terminal plate 6b, that is, toward the slide plate 6d. It has a structure. However, the number of tap terminals 6a and the number of tap positions shown in the present embodiment are examples, and are not limited to these.

The tap changer 6 is attached to a wooden frame 12 and constitutes a wooden assembly unit 7 together with lead wires 11 . After being assembled, the wooden unit 7 is attached to the base 13 arranged on the upper part of the transformer main body 5 .

Next, the manufacturing process of the transformer 1 described above will be described.
In this embodiment, as shown in FIG. 3 as an example, the main assembly step (S1) for assembling the transformer main body 5 and the unit assembly step (S2) for manufacturing the wooden unit 7 are performed in separate steps in parallel. After that, a connecting step (S3) for assembling the transformer main body 5 and the wooden unit 7 is performed. Note that FIG. 3 is a model diagram, and the length of the frame of each step (S1 to S3) does not necessarily indicate the merits of the actual steps.

In this way, by performing the connection step (S3) after performing the main assembly step (S1) and the unit assembly step (S2) in separate steps, the results shown in FIG. It is possible to shorten the period until the connection step (S3) is completed compared to the case where each step (S1 to S3) is sequentially performed in series.

However, in the case of the transformer 1 through which a relatively large current flows, the lead wires 10 and the lead wires 11 are relatively thick, highly rigid, and difficult to bend. Moreover, the transformer main body 5 may have a height exceeding 2 meters, for example, if it is a large one. Therefore, if the main body assembling step (S1) and the unit assembling step (S2) are simply carried out in separate steps, in the connecting step (S3), the timber framed unit 7 can be attached to the transformer main body 5 at a relatively high work place. are assembled, the ends of the lead wires 11 are arranged and cut so that they can be connected to the lead wires 10, the crimp terminals are crimped, and the lead wires 10 are connected to the lead wires 10 with bolts or the like.

In that case, although ensuring safety is given top priority, the lead wires 10 and the lead wires 11 are difficult to bend, and it is necessary to work on the front, back, left and right sides of the wooden frame 12. In addition to the actual work, it is necessary to perform work such as cutting to align the end positions and crimping of crimp terminals at a high place. will also take time.

Therefore, in the present embodiment, the safety in assembling the transformer 1 is improved by shortening the working time at high places as follows. As for the main body assembly process, since the iron core 3 and the winding 4 are assembled in the same manner as in the prior art, the description thereof will be omitted. The lead wires 11 arranged in the wooden unit 7 include those connected to the lead wire 10 from the transformer main body 5 and those connected to the bushing 9 .

In the unit assembly step (S2) of this embodiment, as shown in plan view in FIG. A lead wire 11 is arranged. At this time, by using the template 14 having the identifier 14c indicating the position of the terminal provided on the lead wire 10, the ends of the lead wires 11 can be secured before the wooden unit 7 is assembled to the transformer main body 5. The position is determined, and the crimp terminal is crimped to the end of the positioned lead wire 11 .

Specifically, it is at a predetermined distance (L1) from the lower end of the wooden frame 12 as shown in the front view, and at the front end beam of the wooden frame 12 as shown in the side view. A template 14 having an identifier 14c indicating the position of a terminal provided on the lead wire 10 is arranged. This template 14 has a wooden plate 14a as shown in FIG. 5 as a front view.

Through holes 14b are formed on the surface of the plate 14a to indicate the positions of the holes of the crimp terminals. The letters "U", "V" and "W", which are identifiers 14c indicating whether they correspond to, and the identifiers 14c "1", "2", " 3", "4", "5", and "6" are written. However, instead of the through hole 14b, the identifier 14c indicating the position of the hole of the crimp terminal may be configured to indicate, for example, a circular symbol.

Further, as shown in a plan view, the upper surface of the plate 14a has a through hole 14b indicating the position of the end of the lead wire 11 connected to the bushing 9, and an identifier 14c as an identifier 14c indicating which phase it corresponds to. , 'V' and 'W'. Note that the configuration of the template 14 is an example.

As shown in FIG. 6, the plate 14a is attached to a fixture 15 having an L-shaped frame 15a and a magnet unit 15b provided at the bottom of the frame 15a and whose magnetism is turned on/off by a switch. . A plurality of vertically long holes 15c are formed in the mounting surface of the frame 15a so that the vertical mounting position of the plate 14a can be adjusted.

As shown in FIG. 4 as a side view, the template 14 is fixed at a predetermined position on the upper surface of the assembly carrier 16 having a metal housing 16a by magnetic force. That is, the template 14 has a plate 14a on which an identifier 14c indicating the position of the crimp terminal to be crimped to the end of the lead wire 10 of the transformer main body 5 is described, and can be transported while the wooden unit 7 is assembled. The plate 14a is detachably fixed to the upper surface of the assembly carrier 16, and the position of the plate 14a in the height direction can be adjusted. In FIG. 4, the templates 14 are shown on both left and right sides of the timber frame unit 7 in order to show the arrangement position, but the templates 14 may be provided on the necessary sides. Also, in the side view of FIG. 4, illustration of the lead wire 11 is omitted for simplification of explanation.

By using such a template 14, it is possible to arrange the lead wires 11 and connect the lead wires 11 without assembling the wooden frame unit 7 and the transformer main body 5, that is, before the connection step (S3). It is possible to determine the position of the ends, ie the positions of the crimp terminals, and to crimp the crimp terminals. As a result, in the connection step (S3), there is no need to perform these operations, and the working time in the connection step (S3) can be reduced. Moreover, it is not necessary to work while moving around the wooden unit 7 in order to arrange the lead wires 11. - 特許庁

In addition, in the unit assembling step (S2) of the present embodiment, the operations for assembling the wooden unit 7, such as assembling the wooden frame 12, arranging the tap changer 6, arranging the lead wires 11, and crimping the crimp terminals, are carried out by assembling and transporting. It is carried out on a trolley 16. As shown in FIG. 7 at the time of assembly, the assembly carrier 16 includes a housing 16a made of metal and formed in a rectangular parallelepiped shape, wheels 16b and adjusters 16c provided at the four lower corners of the housing 16a, A metal framework 16d with a horizontal upper end provided on the upper surface of the housing 16a, a T-shaped support plate 16e with a horizontal upper end, and the like are provided. The frame 16d and the support plate 16e correspond to structural members forming a support surface for supporting the wooden unit 7. As shown in FIG.

The assembly carrier 16 is fixed to the floor by lowering the adjuster 16c. By arranging the , it is possible to assemble the wooden unit 7 virtually indicated by the dashed line. At this time, the upper ends of the framework 16d and the support plate 16e serve as support surfaces for supporting the wooden unit 7. As shown in FIG. The height (H1) from the floor to the support surface is set to about 1 meter.

Therefore, the wooden frame unit 7 in a state of being supported by the supporting surface is positioned approximately around the chest of an adult male, and in this state, the wooden frame 12 can be assembled and the lead wires 11 can be arranged. In other words, the worker can assemble the wooden unit 7 while standing on the floor, that is, with a firm foothold and no risk of falling. Also, the worker can work without bending his/her waist. In other words, the height (H1) of the support surface from the floor surface is such that, when the wooden unit 7 is placed on the support surface, the upper end of the wooden unit is lower than the average head position of an adult, more preferably , is set below the chest position. Note that the average head position and chest position can be obtained using, for example, statistical data from the Statistics Bureau of the Ministry of Internal Affairs and Communications.

Therefore, in the connection step (S3), which is a post-process, there is no need to perform the work of assembling the wooden frame 12 or arranging the lead wires 11, and the working time required for the connection step (S3) can be reduced. It also eliminates the need to perform work at height that requires a lot of movement. Further, by using the upper end of the framework 16d as a support surface for the wooden frame unit 7, the operator can grasp or bend the lead wire 11 or the like from between the framework 16d, which makes it difficult to arrange the lead wire. 11 can be improved in usability.

When the assembly of the wooden unit 7 is completed, the entire wooden unit 7 is packed together with the assembly carrier 16 with a packing material 17 schematically shown by hatching, and the adjuster 16c is lifted so that it can be moved by the wheels 16b. Become. In other words, the assembly carrier 16 can assemble the wooden unit 7 and transport it after assembly.

The assembly carrier 16 is provided with a framework 16d and a support plate 16e such that the support surface is at a predetermined height (H2) from the upper surface of the housing 16a. At this time, as shown in plan view in FIG. 8, the frame 16d and the support plate 16e are positioned at a predetermined distance (D2) from the outer edge in the longitudinal direction of the housing 16a having a predetermined depth (D1). As a result, a space is created in the front and rear portions of the housing 16a which are in the vertical direction in the figure.

A template 14 is placed and fixed in this space. As described above, the vertical position of the template 14 is adjustable. Therefore, the template 14 for positioning the terminal of the lead wire 11 can be installed at a desired position, and the transformer main body 5 of various sizes can be accommodated. The shape, number, and arrangement of the framework 16d and the support plates 16e are examples, and other shapes, different numbers, and other arrangements are possible.

According to the embodiment described above, the following effects can be obtained.
In the method of manufacturing the transformer 1, the body assembly step (S1) of assembling the transformer body 5 by assembling the iron core 3 and the winding 4 and the body assembly step (S1) are performed in separate steps. is assembled to the wooden frame 12, and the lead wires 11 connected to the lead wires 10 of the transformer main body 5 are arranged to assemble the wooden unit 7 (S2). Then, in the unit assembling step (S2), a template 14 having an identifier 14c indicating the position of a terminal provided on the lead wire 10 is used to attach the wooden unit 7 to the transformer main body 5. Before assembly, the terminals of the lead wires 11 are positioned at the terminals provided on the lead wire 10 .

This makes it possible to determine the positions of the terminals of the lead wires 11 when assembling the wooden unit 7 alone. It becomes unnecessary to install the hard and hard-to-bend lead wire 11 at a high place.

Also, if the lead wires 11 are to be installed after the wooden unit 7 is assembled to the transformer main body 5, it is necessary to install a firm scaffolding around the wooden unit 7 above the transformer main body 5. However, according to the manufacturing method described above, there is no need to install scaffolding around the entire circumference of the wooden unit 7 . Therefore, it is possible to shorten the working time at high places and improve the safety when assembling the transformer 1 .

In addition, in the method of manufacturing the transformer 1, the crimp terminals are crimped to the ends of the lead wires 10 in the main assembly step (S1), and the crimp terminals are attached to the ends of the lead wires 11 in the unit assembly step (S2). are crimped, and after the main body assembling step (S1) and the unit assembling step (S2), the transformer main body 5 and the wooden unit 7 are assembled, and the crimp terminal on the lead wire 10 side and the crimp terminal on the lead wire 11 side are attached. It includes a connection step (S3) for fastening.

As a result, after the wooden unit 7 is assembled to the base 13, the crimp terminals can be bolted, which simplifies the work that must be done at a high place. Therefore, it is possible to further shorten the working time at high places and further improve the safety in assembling the transformer 1 .

Further, in the manufacturing method of the transformer 1, in the unit assembling step (S2), an assembly carriage 16 capable of transporting the wooden unit 7 in an assembled state is used, and tapping to the wooden frame 12 is performed on the carriage 16. After the switch 6 is assembled and the lead wires 11 are wired, the template 14 is detachably fixed to the upper surface of the assembly carrier 16 and its position in the height direction is adjustable. As a result, it becomes possible to correspond to transformers 1 of various specifications, and the assembled wooden unit 7 can be easily transported, and the wooden unit 7 is less likely to be damaged than when it is transported alone. Fear can also be reduced.

At this time, the height (H1) of the support surface of the assembly carrier from the floor surface is such that the upper end of the wooden unit 7 is higher than the average head position of an adult when the wooden unit 7 is placed on the support surface. It is set below, more preferably below the position of the chest. As a result, the worker can assemble the wooden unit 7 while standing on the floor, that is, in a state where there is a firm foothold and there is no danger of falling. Moreover, the worker can work without bending his/her waist, and the physical burden on the worker can be reduced.

Further, the template 14 used when assembling the transformer 1 has a plate 14a on which an identifier 14c indicating the position of the crimp terminal to be crimped to the end of the lead wire 10 of the transformer main body 5 is described. The plate 14a is detachably fixed to an assembly carriage 16 that can be transported in an assembled state, and the position of the plate 14a in the height direction can be adjusted. This makes it possible to support transformers 1 with various specifications.

Also, as shown in FIG. 9, the template 14 may be of a size corresponding to one phase and, for example, may be configured to be fixed to the assembly carrier 16 for three phases. This makes it possible to flexibly deal with transformers 1 having different specifications. Of course, the template 14 in which three phases are integrated as in the embodiment can be used for a general-purpose product or a transformer 1 with a large production volume.

Also, the through holes 14b provided in the template 14 can be arranged in a vertical line. In the embodiment, the template 14 is fixed to the assembly carriage 16 by magnetic force, but it is also possible to provide several screw holes on the upper surface of the assembly carriage 16 and fix the template 14 with screws or bolts. .
Further, in the embodiment, an example in which the wooden unit 7 is assembled on the assembly carrier 6 is shown, but the wooden unit 7 can also be assembled on a workbench. Even in that case, by using the template 14 , the positions of the ends of the lead wires 11 can be positioned without being attached to the transformer main body 5 .

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

In the drawing, 1 is a transformer, 2 is a tank, 3 is an iron core, 4 is a winding, 5 is a transformer body, 6 is a tap changer, 7 is a wooden unit, 10 is a lead wire, 11 is a lead wire, and 12 is a lead wire. A wooden frame, 14 a template (assembly template), 14c an identifier, and 16 an assembly carrier.

Claims (4)

A manufacturing method for manufacturing a transformer comprising a transformer main body and a wooden unit assembled to the transformer main body,
a body assembly step of assembling the transformer body by assembling the iron core and the winding;
a unit assembling step, which is performed separately from the main body assembling step, for assembling a tap changer to a wooden frame and arranging lead wires connected to lead wires of the transformer main body to assemble the wooden unit; including
In the unit assembly step, an assembly template in which an identifier indicating the position of the terminal provided on the lead wire is described is used, and the terminal of the lead wire is identified before the wooden unit is assembled to the transformer main body. A method of manufacturing a transformer, wherein the position is positioned at the position of a terminal provided on the lead wire. In the main body assembly step, a crimp terminal is crimped to an end of the lead wire,
In the unit assembling step, a crimp terminal is crimped to an end of the lead wire,
After the main body assembling step and the unit assembling step, a connection step of assembling the transformer main body and the wooden unit and fastening the lead wire side crimp terminals and the lead wire side crimp terminals is included. A method of manufacturing a transformer according to claim 1. In the unit assembling step, an assembly carriage capable of transporting the wooden unit in an assembled state is used to assemble the tap changer to the wooden frame and wire the lead wires on the assembly carriage. is done and
3. The method of manufacturing a transformer according to claim 1, wherein the assembly template is detachably fixed to the upper surface of the assembly carriage and is adjustable in height. . A transformer body that accommodates an iron core and windings wound around the iron core ; and a wooden frame that is assembled to the transformer body and to which the tap changer is attached, and is connected to the lead wire of the transformer body. An assembly template used when assembling a transformer having a wooden unit configured by arranging lead wires to be
It has a plate on which an identifier indicating the position of the crimping terminal to be crimped to the end of the lead wire of the transformer main body is described, and is detachable to an assembly carrier that can transport the wooden unit in an assembled state. An assembly template, wherein the plate is fixed and the position of the plate in the height direction is adjustable.

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