JP2020027868A - Manufacturing method of power transformer and assembly template - Google Patents

Abstract

To provide a manufacturing method of power transformer capable of shortening operation time at a high place while improving safety when assembling the power transformer, and to provide an assembly template used when assembling the power transformer.SOLUTION: A manufacturing method of power transformer 1 includes a body assembly step (S1) of assembling a power transformer body 5 by assembling an iron core 3 and a winding 4, and a unit assembly step (S2) of assembling a tap switcher 6 to a wooden frame 12, and assembling a timber-work unit 7 by disposing a lead wire 11 for connection with a cord 10 of the power transformer body 5, executed separately from the body assembly step (S1). In the unit assembly step (S2), a template 14, on which an identifier 14c indicating the position of a terminal provided in the cord 10 is listed, is used. In a stage before the timber-work unit 7 is assembled to the power transformer body 5, position of the terminal of the lead wire 11 is determined at the position of the terminal provided in the cord 10.SELECTED DRAWING: Figure 4

Description

  An embodiment of the present invention relates to a method of manufacturing a transformer and an assembly template used when assembling the transformer.

  Conventionally, a transformer in which a tap changer is accommodated in a tank is known. In such a transformer, the tap changer is mounted on, for example, a wooden frame, and the entire wooden frame is accommodated in a tank (for example, see Patent Document 1).

JP-A-2017-147261

  Now, as in Patent Document 1, a step of assembling a tap changer to a wooden frame to manufacture a timber 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). It is considered that the work efficiency can be greatly improved by carrying out in a separate step.

  By the way, when the unit assembling step and the main body assembling step are performed in different steps, the timber unit is attached to the transformer body, and then the lead wire on the transformer body side and the lead wire on the tap changer side are connected. A step (hereinafter, referred to as a connecting step) is required.

  However, in the case of a transformer through which a relatively large current flows, a lead wire and a lead wire which are relatively thick and have high rigidity and are hard to bend are used. Further, the transformer main body may be, for example, larger than 2 meters in a large size.

  For this reason, in the connection process, it is necessary to arrange hard-to-bend lead wires and lead wires while moving around the timber unit, and crimp the crimp terminals after cutting the lead wires according to the positions of the lead wires. Work is also required. As a result, the time for working in a work place installed above the transformer main body becomes longer, and it is important to ensure the safety of workers. Moreover, not only is the working time long, but also the time required for other than actual work, such as installing a safe scaffold around the timber unit, tends to be long.

  Therefore, a method of manufacturing a transformer, which can reduce the working time at a high place and improve safety in assembling the transformer, and an assembling template used in assembling the transformer, are provided.

  The method for manufacturing a transformer according to the embodiment is a manufacturing method for manufacturing a transformer including a transformer main body and a truss unit assembled to the transformer main body. The main body assembly process for assembling the main body is carried out in a separate process from the main body assembly process.In addition to assembling the tap changer to the wooden frame, arranging the lead wire connected to the lead wire of the transformer main body and assembling the wooden frame unit A unit assembling step, and in the unit assembling step, using a template in which an identifier indicating the position of the terminal provided on the lead wire is described, at a stage before assembling the wooden unit to the transformer main body, Is positioned at the position of the terminal provided on the lead wire.

The figure which shows typically the structural example of the transformer of embodiment. The figure which shows an example of a structure of a tap changer typically The figure which shows a part of the manufacturing process of a transformer typically The figure which shows an example of the structure of a wooden unit typically The figure which shows an example of the structure of a template typically The figure which shows an example of a structure of a fixture typically. The figure which shows an example of a structure of an assembly conveyance trolley typically. The figure which shows typically an example of the arrangement aspect of the upper surface of an assembly conveyance trolley. Diagram schematically showing another configuration example of the 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 static induction device. The transformer 1 includes a transformer body 5 having a tank 2, an iron core 3, and a winding 4, a timber unit 7 to which a tap changer 6 is attached, and the like. The transformer 1 is a so-called oil-filled transformer in which the tank 2 is filled with insulating oil (not shown), and houses the transformer main body 5 and the tap changer 6 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.

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

  The winding 4 of each phase is connected to a high-pressure side bushing 9 and a low-pressure side bushing 9 provided at, for example, an 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 is connected via a tap switch 6 connected via a lead wire 11. In FIG. 1, illustration of the lead wire 11 connected to the bushing 9 is omitted for simplification of the description.

  As shown in FIG. 2, the tap switch 6 electrically connects a terminal plate 6 b provided with six tap terminals 6 a corresponding to each phase and any two tap terminals 6 a of each phase. And a slide plate 6d provided with three movable contacts 6c connected to the slide plate 6d. Assuming that the six tap terminals 6a of each phase are numbered 1 to 6 in order from the left side, that is, from the side opposite to the gear 6e, the terminal plate 6b has tap terminals 6a of number 1 to 6 of each phase. Are equidistantly arranged at a predetermined distance from each other. The tap terminals 6a of each layer are arranged so that the distances to the same-numbered tap terminals 6a 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 a tip of the shaft 6f.

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

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

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

  By performing the connecting step (S3) after performing the main body assembling step (S1) and the unit assembling step (S2) in different steps, as shown in FIG. 3, as a comparative example, As compared with the case where the steps (S1 to S3) are sequentially performed in series, it is possible to shorten a period until the connection step (S3) is completed.

  However, in the case of the transformer 1 through which a relatively large current flows, the lead wire 10 and the lead wire 11 used are relatively thick, have high rigidity, and are not easily bent. Further, the transformer main body 5 may have a height exceeding 2 meters if it is large. Therefore, if the main body assembling step (S1) and the unit assembling step (S2) are simply performed in different steps, the timbering unit 7 is attached to the transformer main body 5 at a relatively high working place in the connecting step (S3). It is necessary to dispose and cut so that the end of the lead wire 11 can be connected to the lead wire 10, crimp the crimp terminal, and connect the lead wire 10 to the lead wire 10 with bolts or the like.

  In this case, although safety is ensured with the highest priority, the lead wire 10 and the lead wire 11 need to work before and after the wooden frame 12 which is hard to bend. It is necessary to perform cutting work to adjust the position of the end, crimping work of the crimp terminal, etc. at a high place, and furthermore, it is necessary to install a safe scaffold around the timber unit 7. Also takes time.

  Therefore, in the present embodiment, the safety in assembling the transformer 1 is improved by shortening the work time at a high place as described below. In addition, as for the main body assembling process, the iron core 3 and the winding 4 are assembled by the same method as in the related art, and the description is omitted. The lead wires 11 provided 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 assembling step (S2) of this embodiment, as shown in plan view in FIG. 4, the tap changer 6 is attached to the wooden frame 12 composed of a plurality of beams, and the plurality of wooden frames 12 are used. The lead wire 11 is provided. At this time, by using the template 14 on which the identifier 14c indicating the position of the terminal provided on the lead wire 10 is described, the end of the lead wire 11 can be formed at a stage before the wooden unit 7 is assembled to the transformer body 5. The position is determined, and a crimp terminal is crimped to the end of the positioned lead wire 11.

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

  On the surface of the plate 14a, through holes 14b indicating the positions of the holes of the crimp terminals are formed. For each of the through holes 14b, the through hole 14b corresponds to, for example, a U-phase, a V-phase or a W-phase. "U", "V", and "W", which are identifiers 14c indicating whether or not they correspond to, and "1," "2", "2", which are identifiers 14c indicating which tap positions correspond to The letters "3", "4", "5", and "6" are described. However, instead of the through hole 14b, for example, a circle symbol or the like may be described as the identifier 14c indicating the position of the hole of the crimp terminal.

  Further, as shown in a plan view, a through hole 14b indicating the position of the end of the lead wire 11 connected to the bushing 9 and “U” as an identifier 14c indicating which phase corresponds to the upper surface of the plate 14a. , "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 a lower portion of the frame 15a and having a magnet turned on / off by a switch. . A plurality of vertically elongated holes 15c are formed in the mounting surface of the frame 15a in a row in the vertical direction, so that the mounting position of the plate 14a in the vertical direction can be adjusted.

  Then, as shown in a side view in FIG. 4, the template 14 is fixed to a predetermined position on the upper surface of the assembling carrier 16 having a metal housing 16a by a magnetic force. That is, the template 14 has the plate 14a on which the 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 can be transported in a state where the wooden unit 7 is assembled. In addition to being detachably fixed to the upper surface of the assembling carrier 16, the height of the plate 14 a can be adjusted. In FIG. 4, the templates 14 are shown on both the left and right sides of the wooden unit 7 in order to show the arrangement position, but the templates 14 may be provided on the necessary sides. In addition, in the side view of FIG. 4, illustration of the lead wire 11 is omitted for simplification of the description.

  By using such a template 14, even if the wooden unit 7 and the transformer main body 5 are not assembled, that is, before the connecting step (S3), the arrangement of the lead wires 11 and the The position of the end, that is, the position of the crimp terminal, and the crimping of the crimp terminal can be performed. Accordingly, in the connection step (S3), these operations need not be performed, and the work time in the connection step (S3) can be reduced. In addition, there is no need to work while moving around the timber unit 7 in order to arrange the lead wires 11.

  In the unit assembling step (S2) of this embodiment, the work of assembling the wooden unit 7 such as assembling the wooden frame 12, arranging the tap changers 6, arranging the lead wires 11, and crimping the crimp terminals is performed by assembling and transporting. It is performed on the cart 16. As shown in FIG. 7, the assembling conveyance cart 16 includes a case 16a formed of metal and formed in a rectangular parallelepiped, wheels 16b and adjusters 16c provided at four lower corners of the case 16a, It has a metal frame 16d provided on the upper surface of the housing 16a and having a horizontal upper end, a T-shaped support plate 16e having a horizontal upper end, and the like. The frame 16d and the support plate 16e correspond to structural members forming a support surface for supporting the wooden unit 7.

  The assembling carrier 16 is fixed to the floor by lowering the adjuster 16c, assembling the wooden frame 12 on the framework 16d and the support plate 16e, assembling the tap changer 6 to the wooden frame 12, and connecting the lead wires 11 Is arranged, it is possible to assemble the wooden unit 7 virtually indicated by the broken line. At this time, the upper ends of the frame 16d and the support plate 16e serve as a support surface for supporting the wooden unit 7. The height (H1) from the floor to the support surface is set to about 1 meter.

  For this reason, the wooden unit 7 supported on the support surface is approximately at the position near the chest of the adult male, and in this state, the wooden frame 12 can be assembled and the lead wires 11 can be provided. In other words, the worker can assemble the timber unit 7 in a state of standing on the floor, that is, in a state where there is a firm scaffold and there is no danger of falling. Further, the worker can work without bending his / her waist. That is, the height (H1) of the support surface from the floor is such that the upper end of the wooden unit is lower than the average adult head position, and more preferably the wooden unit 7 is placed on the support surface. , Is set below the position of the chest. The average position of the head and the position of the chest can be obtained by using, for example, statistical data of the Statistics Bureau of the Ministry of Internal Affairs and Communications.

  For this reason, in the connection step (S3), which is a subsequent step, there is no need to perform the work of assembling the wooden frame 12 and arranging the lead wires 11, and it is possible to reduce the work time required for the connection step (S3). In addition, it is not necessary to perform work requiring a large amount of movement at a high place. In addition, since the upper end of the frame 16d is used as a support surface of the wooden frame unit 7, the worker can grip or bend the lead wire 11 and the like from between the frames 16d, and it is difficult to arrange the lead wire. It is possible to improve usability when arranging 11.

  Then, when the assembling of the timber unit 7 is completed, the entire timber unit 7 is packed together with the assembling carriage 16 with the packing material 17 schematically shown by hatching, and the wheels 16b can be moved by raising the adjuster 16c. Become. That is, the assembling and transporting vehicle 16 can perform the assembly of the wooden unit 7 and the transport after the assembling.

  Further, the assembling carrier 16 is provided with a frame 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 a 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 the predetermined depth (D1). Therefore, a space is formed in the front and rear portions of the housing 16a, which is the vertical direction in the drawing.

  The template 14 is placed and fixed in this space. As described above, the position of the template 14 in the vertical direction can be adjusted. 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. In addition, the shape, the number, and the arrangement of the skeleton 16d and the support plate 16e are examples, and other shapes, different numbers, or other arrangements can be adopted.

According to the embodiment described above, the following effects can be obtained.
The method of manufacturing the transformer 1 is performed in a body assembly step (S1) for assembling the core 3 and the windings 4 to assemble the transformer body 5, and in a separate step from the body assembly step (S1). And a unit assembling step (S2) of assembling the wooden frame unit 7 by assembling the wooden frame 12 with the lead wire 11 connected to the lead wire 10 of the transformer main body 5. Then, in the unit assembling step (S2), in the unit assembling step (S2), the timber-framed unit 7 is attached to the transformer body 5 using the template 14 on which the identifier 14c indicating the position of the terminal provided on the lead wire 10 is described. Before the assembly, the positions of the terminals of the lead wire 11 are positioned at the positions of 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 truss unit 7 alone. Therefore, after the truss unit 7 is assembled to the transformer body 5, that is, above the transformer body 5. The work of arranging the lead wire 11 that is hard and does not bend at high places becomes unnecessary.

  Also, if the lead wire 11 is to be arranged after the wooden unit 7 is assembled to the transformer body 5, it is necessary to provide a firm scaffold around the wooden unit 7 above the transformer body 5. However, according to the manufacturing method described above, it is not necessary to install a scaffold all around the timber unit 7. Therefore, the work time at a high place can be reduced, and the safety when assembling the transformer 1 can be improved.

  In the method of manufacturing the transformer 1, a crimp terminal is crimped on the end of the lead wire 10 in the body assembly step (S1), and a crimp terminal is crimped on the end of the lead wire 11 in the unit assembly step (S2). 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. (S3).

  Thus, after the wooden unit 7 is assembled to the base 13, the crimping terminal may be bolted, so that the work itself that needs to be performed at a high place can be simplified. Therefore, the working time at a high place can be further reduced, and the safety when assembling the transformer 1 can be further improved.

  In the unit assembling step (S2), the transformer 1 is manufactured by using an assembling carrier 16 capable of carrying the wooden unit 7 in an assembled state, and tapping the wooden frame 12 on the carrier. The switching device 6 is assembled and the lead wires 11 are wired. The template 14 is detachably fixed to the upper surface of the assembling carrier 16 and the position in the height direction is adjustable. This makes it possible to cope with the transformers 1 of various specifications, and at the same time, the assembled wooden unit 7 can be easily transported, and is damaged as compared with the case where the wooden unit 7 is transported alone. Risk can also be reduced.

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

  The template 14 used when assembling the transformer 1 has a plate 14 a on which an identifier 14 c indicating the position of a crimp terminal to be crimped to the end of the lead wire 10 of the transformer main body 5 is described. Is removably fixed to an assembling carrier 16 that can be transported in the assembled state, and the position of the plate 14a in the height direction can be adjusted. Thereby, it can respond to the transformer 1 of various specifications.

  Further, as shown in FIG. 9, the template 14 may have a size corresponding to one phase, and may have a configuration in which, for example, three phases are fixed to the assembling carrier 16. Thereby, it is possible to flexibly cope with the transformer 1 having different specifications. As a matter of course, for the transformer 1 for general-purpose products or for a large production amount, the template 14 in which three phases are integrated as in the embodiment can be used.

Further, the through holes 14b provided in the template 14 can be arranged in a line in the upper and lower directions. In the embodiment, the configuration in which the template 14 is fixed to the assembling and transporting trolley 16 by magnetic force has been described. However, some screw holes may be provided on the upper surface of the assembling and transporting trolley 16 and fixed by screws and bolts. .
In addition, in the embodiment, the example in which the wooden unit 7 is assembled on the assembling carriage 6 is shown, but the wooden unit 7 can also be assembled on a work table. Even in such a case, by using the template 14, the position of the end of the lead wire 11 can be determined without being assembled to the transformer main body 5.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

  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 is a template (assembly template), 14c is an identifier, and 16 is an assembling carrier.

Claims (4)

A manufacturing method for manufacturing a transformer including a transformer body and a half-frame unit assembled to the transformer body,
A body assembly step of assembling the transformer body by assembling an iron core and a winding;
A unit assembly step performed in a separate step from the main body assembly step, assembling the tap changer to the wooden frame, and arranging a lead wire connected to a lead wire of the transformer main body to assemble the wooden framing unit, Including
In the unit assembling step, using an assembling template in which an identifier indicating a position of a terminal provided on the lead wire is described, and before assembling the wooden unit to the transformer body, the terminal of the lead wire A method for manufacturing a transformer, comprising: positioning a position of a terminal provided on the lead wire. In the main assembly process, 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, the transformer main body and the timber unit are assembled, and a connecting step of fastening the crimp terminal on the lead wire side and the crimp terminal on the lead wire side is included. The method for manufacturing a transformer according to claim 1, wherein: In the unit assembling step, assembling of the tap changer to the wooden frame on the transport trolley, and wiring of the lead wires are performed on the transport trolley using an assembly transport trolley capable of transporting the truss unit in the assembled state. Done,
The method for manufacturing a transformer according to claim 1, wherein the template is detachably fixed to an upper surface of the assembling carriage, and a position in a height direction is adjustable. A transformer template for use in assembling a transformer having a transformer body and a wooden frame unit assembled to the transformer body,
It has a plate with an identifier indicating the position of a crimp terminal crimped to the end of the lead wire of the transformer main body, and is detachably fixed to an assembling carrier that can be transported in a state where the wooden unit is assembled. And a height-adjustable position of the plate.

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