JPH04162605A - Transformer to be transported in disassembled state; its transportation and assembly method - Google Patents

Abstract

PURPOSE:To assemble this transformer in a site, in a short assembly period and with high quality by a method wherein a main leg, to which a winding is attached, of a transformer iron core is split nearly in the central part of its width so as to handle divided main legs as a U-shaped split iron core unit and a winding unit and their outer surface is sealed hermetically by using a moistureproof film. CONSTITUTION:A transformer main body which has been transported in a disassembled state is assembled in a site inside a dustproof house 25. The dustproof house 25 is fixed to and supported by the ceiling of a transformer chamber 26; a movement guide 30 is arranged on the floor face 31 of the transformer chamber 26; a dry-air generation apparatus 28 is attached; a constant temperature state whose humidity is at 50% or lower is kept. A working stand 32 is set; a winding 2 which has been sealed hermetically by using a moistureproof film 11 is inserted into a main leg 1a at an iron core 1 on the stand; an upper-part yoke 1b and an upper-part content support device 6a are assembled. Then, the iron core 1 and the winding 2 can be assembled only by clamping the winding 2; moistureproof films 11c to 11e are removed at this stage. When the winding 2 and the moistureproof films 11c to 11e are removed and a main body tank is evacuated to produce a vacuum, the operations can be completed within 20 hours in the case of a transformer at 275kV and 450MVA. A special drying process in the site is not required; the vacuum is produced; an insulating oil 13 is oiled; the assembly operation is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a disassembled and transported transformer and a method for transporting and assembling the same, which significantly reduces the transport weight.

(Prior Art) In recent years, as the demand for electric power has increased, the voltage of power transmission systems has become higher, such as 500 KV, and the capacity of transformers used for power transmission and transformation has also increased. Furthermore, power transmission distances are becoming longer, and the transformers are often installed in mountainous areas or underground in urban areas, where transportation conditions are even more severe, making it necessary to significantly reduce their transportation size and weight.

Conventionally, for transformers installed in such places, for example, in the case of a three-phase transformer, it is configured as three single-phase transformers, transported separately, and then transported on-site through a three-phase tank or a common duct. There is a split transport transformer configured as a three-phase transformer by connecting and coupling each single-phase transformer to form a three-phase connection.

Furthermore, there is a subdivided transport transformer method in which a transformer assembled in a factory is disassembled into various parts such as core legs, core upper and lower yokes, windings, and divided tanks, and then reassembled on site.

(Problem to be solved by the invention) When a 30 OMVA class transformer is constructed using a divided transport transformer system, it is common to divide it into three parts due to the on-site installation space and economical efficiency of the transformer, and the transport weight is approximately 60 tons. The limit is to reduce it. Therefore, there are problems such as the need for road reinforcement work including large-scale bridge reinforcement for local trailer transport after rail or ship transport, resulting in huge transportation costs.

On the other hand, a subdivided and disassembled transport transformer can be transported from the factory to the site using a general trailer without road reinforcement, but as with factory assembly, even at the site, the weight exceeds 100 tons after the core legs are laid down and the lower yoke is loaded. Large-scale erection equipment, such as raising the iron core, and foundation work to support and install it are required.

Furthermore, since it takes a long time to reassemble the divided parts, the winding insulation absorbs moisture and requires a long drying process, which increases the transformer installation time and has drawbacks such as deterioration of the quality of the contents due to foreign matter contamination. .

The purpose of the present invention is to reduce the transportation size and weight of partial units of large-capacity, large-sized transformers that are to be transported separately by making it possible to transport them directly from the factory to the site using general trailers, thereby significantly reducing transportation costs. By transporting the iron core, winding, and tank attachment parts separately or in unit configurations, on-site reassembly parts can be minimized and on-site assembly equipment can be simplified.

A transformer for disassembly and transportation that ensures assembly quality and significantly shortens the assembly period, and further simplifies the on-site contents drying process 1 assembly equipment and improves quality by applying moisture-proof and dust-proof measures to the windings and on-site assembly equipment. The purpose is to provide equipment and a method for transporting and assembling it on-site.

[Structure of the invention]

(Means for Solving the Problems) The present invention implements the following technical means to achieve the above-mentioned objects. That is, the main leg on which the transformer core windings are attached is divided approximately at the center of its width, and when the core is transported to the site, the windings and upper yoke are removed and the core is transported as a U-shaped split core unit.

The winding is constructed so that it can be lifted and transported as a winding unit that combines high-voltage coils, low-voltage coils, tap coils, etc., and its outer surface is sealed with a moisture-proof film for transportation or on-site assembly. .

Iron cores, windings, internal leads, tanks, etc. are disassembled into 4IiIJ formats for wheel speed, and each is sealed in dry air before being transported.

When assembling the contents of a transformer in a basement or building, install a dust-proof house that controls dust and humidity, and use a movable lid inside the house.

(Function) With this configuration, the core is divided into parts at the core main legs, so when transported, the core is transported as a U-shaped core unit. For example, since the three-phase, five-leg iron core, which is the heaviest part of a 300 MVA class transformer, is transported separately as a unit of four cores, the dimensions and weight are approximately 25 tons, which is less than 174, and can be transported in a general low-floor trailer.

The windings are supported and fixed by insulating cylinders on the inner and outer circumferences, and insulating plates on the top and bottom, so that they can be lifted up as a winding unit while assembled.
Allows for handling. This eliminates the need for on-site assembly of complex insulators inside the windings, making it possible to significantly shorten the construction period. Furthermore, by sealing the outer surface of this winding assembly with a moisture-proof film, it is possible to maintain the dry condition before transportation to the factory even during on-site assembly, thereby eliminating the need for a special drying process after assembly. In addition, the moisture-proof film completely prevents foreign objects and dirt from entering the windings, where the electric field is high, during on-site assembly work, making it possible to ensure the quality of on-site assembly.

For the first winding of the core, which is the most important part in terms of transformer performance, only the upper yoke of the core is disassembled and transported, and the rest is transported assembled as a unit.
On-site assembly of windings is completed.

This makes it possible to minimize the amount of on-site work that would otherwise result in a decline in performance and quality.

The transformer tank shall be transported in at least two parts.

Transport the upper tank with the on-load tap changer and bushing attached as far as transportation limits allow. By supporting at least the internal lead from the inner wall of the tank, it is possible to assemble and transport the tank together with the tank without disassembling it, thereby minimizing on-site assembly of the contents, shortening the construction period, and improving quality assurance.

A waterproof and dustproof house is installed in the underground transformer room or building, and the contents of the transformer and tank are assembled inside the house.
The dust-proof house is connected to a dry air generator, etc., and the internal humidity is controlled to a low humidity level of approximately 50% or less to suppress moisture absorption by the insulation. In addition, core units, windings, etc. are assembled using a lifter that has a support device that can be lifted up and down and can be moved horizontally. The quality of on-site assembly is ensured by controlling the humidity and dust level in the waterproof and dust-proof house, but sometimes the electric field is high, ensuring the quality of the transformer.Upper placement is also important.The winding is inserted into the iron core and the upper yoke is finished. The moisture-proof film maintains the sealed state until just before the winding tightening work in the final process of assembling the contents9. Therefore, it is possible to minimize the moisture absorption of the internal insulation of the winding and completely prevent foreign matter and dirt from entering, resulting in high quality. It is possible to assemble transformer windings.

(Example) An example of the present invention will be described below with reference to the drawings. 1st
Figure 3 shows the internal assembly structure and tank of a three-phase transformer employing a three-phase five-leg iron core. The three-phase five-leg iron core 1 is constructed by dividing the three main legs 1a to which the windings 2 are attached at the center of the width direction, thereby creating two main legs 1a, upper and lower yokes lb,
Four frame-shaped iron core units IA each made of lc are formed, and these iron core units IA are arranged side by side with a slight gap 3 therebetween.

Figures 4 and 5 are diagrams showing the transport and assembly state of the core unit IA, with the upper yoke 1b removed, the main landing gear 1a, and the lower yoke 1.
The leg rest plate 4 and the yoke rest plate 4a are applied to both sides of c, and the U-shaped core unit IA is formed after tightening with glass tape 5.58 or the like to form a bind body. When lifting and handling this, the hanging metal fittings 9 with hanging ears attached are fitted and fixed to the left and right leg rest plates 4 with pins or the like.

As shown in Figures 2 and 3, four U-shaped core units IA
is fitted into and fixed to the lower content support device 6b of three-phase integrated structure fixed to the bottom surface of the lower tank 12b. After the windings 2 are inserted into the main legs 1a arranged next to each other and assembled, the upper yoke 1b is stacked, and the upper support device 6a having a three-phase structure is attached to both sides by tightening with bind tape 5a or the like. Further, the lower surface 2A of the winding 2 is supported by placing a winding support block 7b on the upper surface of the lower yoke 1c and the surface of the lower content support device 6b. The winding 2 is tightened with a predetermined load using an unillustrated hydraulic jack or the like from the upper content support device 6a, and then the upper winding support block 7a is set. Here, the upper and lower yoke lb of the iron core.

Since the lc and the upper and lower body support devices f6a and 6b are strongly connected by the leg support plate 4, the winding 2 is fixedly tightened between them in the vertical direction.

The structure of the winding 2 is shown in FIGS. 6 and 7, and high and low voltage coils 2b, 2a, tap coil 20, etc. are arranged on the lower insulating plate 10d.

The winding 2 is supported and fixed by insulating parts 10a and 10b on the inner and outer peripheries, and insulating plates 10c and 10d on the upper and lower surfaces, and each coil has insulating parts in both the radial direction and the upper and lower directions to ensure electrical insulation strength. Then, support, fix and tighten each coil.

As shown in Figure 6, the outer surface of the winding 2 is covered with a moisture-proof film Ila.
The moisture-proof films 10a and 10b on the inner and outer surfaces of the winding 2 are installed at the winding assembly stage, and the upper and lower insulating plates 10c and 10d, the moisture-proof films 10a and 10b on the surface and the coil outlet are factory tested. This is carried out after draining and drying the inside of the machine and removing the winding 2 from the iron core 1.

Winding 2 hermetically sealed with a moisture-proof film in this way
When lifting and handling at the site, as shown in FIG. 7, the support fitting 15 of the lifter is placed on the lower surface of the lower insulating plate 10d to support and raise it. At this time, the winding unit 2 is attached to the support fitting 15.
is fixed with a fixing band 16.

As shown in FIG. 3, the tank 12 that houses the iron core 1 and the winding 2 together with the insulating oil 13 is divided into two or more parts by a horizontal flange 12A. The position H where the lower horizontal flange is formed is located near the height Ho of the lower surface 2A of the winding 2 or below it.

The restriction on transport with a general low-floor trailer is approximately 30 in terms of transport weight.
The width is 3.2m, the height is 3.6m, and the length is 9m.

FIGS. 8 and 9 show the transportation and assembly configuration of the core unit IA.

After factory testing, the core was disassembled into a U-shaped core unit IA.
The hanging fitting 9 is attached to the upper opening side to ensure dimensional accuracy between the left and right main legs 18. The transport tank 17 is divided near the floor to facilitate the work of fixing the core unit IA. Transport tank 1
7. Attach steady-stop fittings 17c and 17d to the upper and lower parts of the inside, and insert a wedge 18a between them and the iron core unit IA.

18b, etc., to stabilize the core unit IA in the front, rear, left and right directions. Furthermore, dry air or the like is sealed inside the sealed tank 17.

FIGS. 10 and 11 show the transport and assembly configuration of the unit of winding 2. After the factory test, the outer surface of the winding 2 is finally hermetically sealed with moisture-proof films Ila to 11e over the entire surface as shown in FIG. 7, and the winding 2 is placed in a transport tank 19. The transport tank 19 is divided at a position close to the floor surface. A circular fixed cylinder 19c is fixed to the inner bottom surface of the lower transport tank 19b, and the winding 2 is inserted therein. A spacing piece 21c is arranged and fixed in the circumferential direction between the winding 2 and the fixed cylinder 19c.

Spacing pieces 21a and 21b are attached to the top and bottom of the winding 2, and a tightening plate 20 is fixed to the top of the identification tube 19 with bolts or the like.

Tighten winding 2.

Furthermore, dry air or the like is sealed inside the sealed tank 19. 12 to 14 show the transportation and assembly configuration of the transformer tank 12, internal leads 23, on-load tap changer 22, etc.

Bushings, on-load tap changer 22, etc. related to the assembly of the contents of the transformer are attached to the upper tank 12a as far as transport limitations permit. At least the tap lead 23a connected to the on-load tap changer 22 and the bushing lead 23b connected to the bushing are supported by a lead support 24 on the inner wall of the tank.
is fixed and transported while attached to the upper tank 12a.

Similarly, a lower content support device 6 is provided inside the lower tank 12b.
A, insulators, etc. are contained and transported, and the lower tanks 12a, 12b are sealed with a blind plate 12d, and dry air, etc. is sealed inside the lower tanks 12a, 12b.

15 and 16 show the configuration of a dustproof house 25 and a lifter 27 used for on-site assembly of a transformer in a transformer room 26. A moving guide 30 is placed on the floor 31, and a moving device 29 is placed on the floor 31. A lifter 27 with a

Further, a support device 15 for lifting the iron core 1 and the winding 2 is attached to the lifter 27, and this is operated by a screw 15a and a handle 15b.

The dustproof house 25 is supported and fixed by a fixture 26a attached to the ceiling or the like of the transformer room 26. Furthermore, a dry air generator 28 etc. is connected and operated to the dust-proof house 25 in order to keep the inside humidity low. 6 Figures 17 and 18 show the iron core 1,
The assembled state of winding 2 is shown.

The lower tank 12b is installed on the floor surface 31, and a lifter 27 and an assembly workbench 32 are arranged around it. U-shaped core unit IA and moisture-proof film 1 transported from the factory in a disassembled trailer
Once the winding 2 sealed in step 1 can be moved from the transport tank, it is lifted by the lid 27, moved, and suspended into the lower tank 12b to assemble the contents.

19 and 20 show the assembled state of the transformer main body. Here, the main tank 12 is assembled at least inside the dustproof house 25. The taps and bushing leads 23a, 23b supported and fixed on the inner surface of the tank 12 are connected to the outlet of the winding #12 through the tank opening 12c.

The three-phase, five-leg iron core shown in Figure 1 is, for example, a 275 KV substation transformer with a maximum capacity of 450 MVAll, and the core assembly weight exceeds 100 tons, but it is separated at 18 main legs, and the core unit is U-shaped as shown in Figure 8. By dividing it into IAs and transporting it, the weight becomes approximately 25 tons including the 17 transport tanks, making it possible to significantly reduce the transport weight to about 1/4 or less. The transportation dimensions can be manufactured within 2m width, 3m length, and 3.5m height, and it can be transported from the factory to the site using a general low-floor trailer. First, the iron core unit IA is U in Figures 4 and 5.
By arranging four core units IA in the shape of a letter, a three-phase five-legged core shown in FIGS. 1 and 2 can be obtained. By ensuring a gap 3 between each core unit IA, incomplete contact and magnetic flux linkage are eliminated. As shown in FIGS. 2 to 5, the main landing gear 1a, upper and lower yokes lb and lc are each bound with glass tape 5a.
Ensure strength and rigidity for lifting, transportation, etc. Also, an iron core tightening fitting 8a is fixed to the leg support plate 4.

By arranging 8b on the upper and lower outer surfaces of the upper and lower yokes lb and lc, it supports the core weight, winding tightening force, or short-circuit mechanical force when lifting the core. In addition, since each core unit IA is suspended and fixed to the lower content support device 6b inside the lower tank 12a, the winding tightening force that acts between the lower content support device 6b and the upper support device 6a and short circuits in the event of an accident. The mechanical force can be strongly supported through the leg support plate 4. Each core unit IA to be hoisted or transported in a U-shape is fitted with hanging fittings 9 on both sides of the upper side of the left and right legs 1a by fitting them onto the plate 4, as shown in Figs. 4, 5, 8, and 9. , This allows the dimension between the legs to always be fixed constant. Therefore, it is possible to prevent excessive loads from being applied to core punching and joints during lifting and transportation.

In addition, the iron core unit IA during transportation has upper and lower transport tanks 17a,
17c and 17d are fixed to the vibration-preventing metal fittings 17c and 17d, and spacing pieces 18a and 18b such as wedges are used to ensure secure fixation in the front, rear, left and right directions, so vibrations during transportation can increase in width between the iron core unit IA and the transport tank 17, or cause collisions. Damage and loosening can be prevented without having to do so.

The winding 2 shown in FIG. 7 has insulating plates 10c and 10d on its upper and lower surfaces.
Since the inner and outer circumferential surfaces are supported and fixed by the insulating cylinders 10a and 10b, as shown in FIG. 7, even if the entire winding 2 is lifted or handled at once, each coil will not be strained, and the support fittings 15 can be attached. There is no direct contact with the winding 2, and no damage occurs.

Since the electrical stress is the most severe inside the winding 2, a large amount of insulating material is arranged in a complicated configuration. Therefore winding 2
If foreign matter or dirt gets inside, or if the insulator absorbs moisture, the quality of the transformer will deteriorate, and a large-scale on-site drying process will be required.

In order to solve the above-mentioned problems during disassembly and transportation and on-site reassembly work, the present invention provides moisture-proof films Ila, ll on the inner and outer peripheries of the winding 2, which seals the entire outer surface of the winding 2 with a moisture-proof film 11.
Attachment b is carried out during the winding assembly stage.

By using a polymer material with excellent oil and heat resistance for the film material, it can be used as is without having to be dismantled even after on-site assembly. Generally, the voltage resistance and corona properties of the film material are several times stronger than the insulating paper used inside the winding 2, and the insulating properties are not deteriorated. The moisture-proof films llc-lie on the upper and lower surfaces of the winding 2 and the coil lead portion are installed after the factory test is completed, the contents are drained and dried, and the winding 2 is extracted from the iron core 1 for disassembly and transportation. The joints between these moisture-proof films 11 and the moisture-proof films lla and llb previously attached to the inner and outer peripheries of the winding 2 are made with connecting film tape. The moisture-proof films lie to lie are removed at the on-site assembly stage to secure a cooling oil flow path to the inside of the winding 2.

By attaching a protective sheet to the outer surface of the moisture-proof film 11, it is possible to prevent the film from being damaged during various operations.

The winding 2 with the moisture-proof film 11 attached to the inner and outer peripheries is inserted into each main leg 1a after the core unit IA is hung and fixed in the lower tank 12a. The lower surface of the winding 2 is supported by the core lower yoke IC surface and the lower core support device 6b.

After assembling the upper yoke lb and the upper inner support device 6a, the winding 2 is tightened with a predetermined load from the upper inner support device 6a using jacks or the like, and the upper winding support block 7a is set and fixed. This tightening force is applied to the upper and lower contents support device 6a.

It is held by the strength of the leg rest plate 4 that connects the legs 6b.

After the factory test, the winding 2 is removed from the iron core 1 in the assembled state shown in FIG. 6, and moisture-proof films 11 are attached to the upper and lower surfaces, etc., and the outer surface is completely hermetically sealed. The unsealed winding 2 is dried and finally sealed while blowing dry air to complete the winding Ii! It is possible to control the moisture content of the inner insulator to 0.5% or less. By using a polymeric film material for the moisture-proof film 11, moisture permeation during transportation or on-site assembly can be suppressed to a negligible value.

As shown in FIGS. 10 and 11, the winding 2 is transported by inserting it into a circular steady-stop tube 19c fixed to the bottom of the transport tank 19, and then using a fastener fixed to the top of the steady-stop tube 19e to prevent the winding from moving in the horizontal direction. The attached plate 20 is uniformly tightened with a predetermined pressure to prevent sway in the vertical direction so that the winding 2 will not loosen due to vibration or impact force during transportation. Lower transport tank 19b
, between the clamping plate 20 and the winding 2 are support spacing pieces 21a, 2.
1b are evenly spaced to support and fix the winding 2, and when hoisting the winding 2, the support fittings 15 are set using the spaces between the spacing pieces 21a.

The winding assembly and transport specifications for a 275KV 450MVA class transformer are: Weight: 25 tons or less; Dimensions: 2.5m width, 2.5m
The height is less than 3 meters, and it can be transported from the factory to the site using a general low-floor trailer.

The disassembly and transportation of the tank 12, internal leads 23a-23b, on-load tap changer 22, etc. are shown in FIGS. 12 to 14.

By supporting and fixing the tap lead 23a and bushing lead 23b on the inner surface of the tank 12, the internal lead assembly work during on-site assembly can be reduced to only the connection with the coil outlet lead or the connection with the bushing that has been unavoidably removed and transported due to transport limitations. limit.

Therefore, it is possible to minimize the moisture absorption level of the insulators of the winding 2 and the insulators of the internal leads 23a and 23b during the connection work.

The main body of the transformer, which was transported in parts with the minimum number of divisions, was the 15th
It is assembled in the on-site dustproof house 25 shown in the figure and FIG. 16. This dustproof house 25 is fixedly supported by a fixing fitting 26a on the ceiling of the transformer room 26. In addition, core unit IA and winding 2
In order to suspend the upper tank 12a, etc., a moving guide 30 is placed on the floor 31 of the transformer room 26, and a handle 1 is placed on top of the moving guide 30.
A moving device that carries a lifter 27 with a support bag @15 that moves up and down with 5b! 29 to move it horizontally. Also,
Since the dustproof house 25 is equipped with a dry air generator [28], it is possible to always maintain the humidity inside the dustproof house 25 at a low temperature of 50% or less.

The assembly of the core unit IA and the winding 2 in the dustproof house 25 is shown in FIGS. 17 and 18.
A. The work of hanging the winding 2 is carried out using a movable lid 27. In addition, a workbench 32 is set around the transformer installed in the dust-proof house 25, and the contents of the core 1, windings 2, etc. are assembled on this workbench.The windings 2 sealed with the moisture-proof film 11 remain sealed. Insert and set into the main leg 1a of the iron core 1. Once the upper yoke lb of the iron core 1 and the upper content support device 6a are assembled, the assembly of the iron core 11 winding 2 requires only the tightening work of the winding 11A2. Volume 1!2 Moisture-proof film on the top and bottom surfaces llc~
11e removal will be carried out at this stage. That is, by using the space between the upper surface of the winding 2 and the lower surface of the upper yoke 1b, attach a jack to the lower insulating plate 10d of the winding 2, the bottom of the tank, etc., jack it up, remove the lower moisture-proof bag llc, and support the lower contents of the winding 2. The device 6a and the winding support block 7a supported from the lower yoke lb surface are installed by jacking down and performing the final setting.The upper moisture-proof film lid and the coil opening moisture-proof film lie are removed and the final winding 2 tightening work is performed. .

The assembly of the main tank 12 and internal leads 23a and 23b as shown in FIGS. 19 and 20 is carried out in the dust-proof house 25, and when the vacuuming process begins, the main body tank is assembled from the removal of the winding 2 and moisture-proof films lie to lie. 27 until vacuuming
The work can be completed within 20 hours using a 5KV 450MVA class transformer. Conventionally, the permissible exposure time for the contents of a transformer with a voltage of 275 KV or higher is 50 hours, but according to this method, even if disassembly and reassembly is performed on-site, the exposure time for the contents is shorter than the time required for on-site assembly of conventional special three-phase transformers. Is possible. Since the moisture absorption level of the insulator is a sufficiently small value of iJs, no special on-site drying process is required. Assembly of the transformer body is completed by evacuating the main body tank 12 and filling it with insulating oil 13.

By employing the disassembled and transported transformer and its transportation and assembly method according to the present invention as explained in the above-described embodiments, the following effects can be obtained.

■ By adopting a configuration in which the 3m5 leg iron core 1 is separated into left and right parts at the center of the main leg 1a to which the winding 2 is attached, as shown in Figure 1, it is possible to transport it by dividing it into four iron core units IA. Therefore, both the transportation weight and transportation dimensions can be 174 mm or less for the integrated three-phase five-leg iron core. Therefore 275
Even a core with the maximum weight and size for a 450MVA class transformer, which has the maximum capacity for a KV substation, weighs approximately 25 tons, making it possible to transport it directly from the factory to the site using a general low-floor trailer. This will significantly reduce transportation costs and make it possible to install large-capacity transformers in underground substations in urban areas and substations in mountainous areas, where transporting heavy objects has been impossible.

■ As shown in Figure 6, the inner and outer circumferences of the winding 2 are connected to an insulating tube 10a.
, 10b are collectively supported and fixed by the insulating plates 10c and 10d, respectively, so that each coil 2a, 2b can be lifted and handled as a winding 2 assembly without disassembly. Therefore, the winding characteristics and quality after factory testing will not deteriorate even if the wire is disassembled, transported, and reassembled by taking steps to prevent moisture absorption from the insulation and foreign matter from entering.

For disassembly, lifting, and reassembly work, insulating tubes 10a and llb are completely surrounded by insulating plates 10c and 10d around the winding 2.
Since it is covered and protected, it is possible to physically prevent damage during work.

roll#! 2, the entire outer periphery is sealed with a moisture-proof film 11, and the sealed state is maintained until the final stage of on-site assembly of the contents. Therefore, the level of moisture absorption of the winding insulation during transportation or on-site reassembly process can be minimized. Furthermore, it is possible to prevent dust and foreign matter from entering, and the quality of the winding 2 is not degraded at all, making it possible to ensure the same quality as a conventional integrated transformer. Removal of the moisture-proof film 11 is limited to only the upper and lower surfaces, making the work easier. By using a polymer film material for the moisture-proof film 11, the quality can be further improved than that of insulating paper in terms of heat resistance, oil resistance, insulation strength, etc.

Even in a 450 MVA class transformer, the transport weight of winding 2 is less than 25 tons, and like the iron core, it can be transported on a general low-floor trailer.

■ Tap lead 23 as shown in Figures 12 and 13.
a. Bushing lead 23b, etc. are supported and fixed on the inner surface of tank I2, and disassembly and reassembly are limited to only the connection to the coil outlet lead, ensuring on-site assembly quality and reducing the time the contents are exposed. The on-site moisture removal process and drying process can be simplified.

(4) On-site assembly work that involves exposing the contents of the iron core 1, winding 2, tank 12, etc., is performed on the dry air generator 2 shown in Figure 15.
The process is carried out in a dust-proof house 25 equipped with a humidity control device such as No. 8, which controls the humidity to below 50%, which minimizes moisture absorption of the insulation and prevents foreign matter, dirt, etc. from entering the contents, ensuring high quality. This makes it possible to assemble a transformer with Further, the dustproof house 25 is fixedly supported by a fixing fitting 26a on the ceiling of the transformer room 26. In addition, a lifter 27 having a support device 15 that can be moved up and down by a handle 15b is arranged in the transformer chamber 26 to assemble the iron core 1 and the winding 2. Although the work of inserting the winding 2 and stacking the upper yoke 1b requires work at a high place, the work can be done safely and reliably by arranging the workbench 32 within the dust-proof house 25.

Next, other embodiments of the present invention will be described.

FIG. 21 shows an example in which a three-phase, five-legged iron core is assembled or disassembled for transport using a two-part structure, and is adopted in cases such as medium capacity transformers where the transport weight is not a problem but the transport length needs to be reduced. Since there are fewer parts to disassemble, transportation costs and on-site assembly time can be shortened.

In addition, although Fig. 1 shows an example of a three-phase, five-leg iron core, single-phase three-leg,
The same effect can be obtained with a single-phase four-legged or single-phase five-legged iron core by using a direction-disassembly configuration.

〔Effect of the invention〕

As explained above, according to the disassembled transportation transformer and its transportation and assembly method according to the present invention, taking a three-phase transformer as an example, a three-phase five-legged core is divided into four U-shaped core units and assembled and transported. The on-site assembly can be limited to the upper yoke part only. In addition, after completion of the factory test, the windings are high-voltage, low-voltage, tap coils, etc. can be disassembled and reassembled as one piece without disassembly.The number of equal disassembly units is minimized, allowing for high-quality on-site assembly in a short construction period. It is possible. In addition, the windings should be sealed with a moisture-proof film and assembled as is, the moisture-proof film should not be removed until the final stage of internal assembly, the internal leads should be supported inside the tank for assembly, and the on-site assembly should be carried out in a dust-proof house with dust and humidity control. This makes it possible to simplify the on-site drying process and provide highly reliable transformers.

On the other hand, the transport weight of the transformer is 275KV300MV for the conventional split type transformer due to the installation space and economic efficiency of the transformer.
Even with an A-class transformer, the transport weight can only be reduced to about 60 tons, and local trailer transport costs a considerable amount of time and money if road reinforcement work is included.According to the present invention, it is for a 275KV substation and has a maximum capacity of 450MVA. Even in the case of a class transformer, the transport weight can be about 25 tons, so it can be transported from the factory to the site using a general low-floor trailer without road reinforcement.

Furthermore, in the conventional split-type three-phase transformer, the single-phase three-legged core 3
In contrast, the present invention has the same configuration as an integrated three-phase five-legged core, and the core weight and number of punched plates can be reduced to approximately 273 or less, making it compact and material contact transformation. We can provide equipment.

In addition, 60O
In the case of MVA class large capacity transformers, the transport weight is reduced to 5 if the split method is used.
Even if it is about 0 ton, it is necessary to configure the unit transformer with six or more divisions, and the space for installing the transformer increases significantly. In the present invention, the transport weight is 30 tons or less, and it can be transported on a general low-floor trailer, reducing transport costs.In addition, since the transformer is constructed as a three-phase integrated transformer, the transformer installation space is reduced compared to the conventional divided method.
/2 or less. In mountain pumped storage power plants, the transformer is installed in an underground building like the generator, so reducing the space for installing the transformer makes it possible to reduce power plant construction costs.

For example, a large capacity transformer for a 500KV substation is 100100.
When transporting an O transformer as a 3-phase integrated type, the transport weight is 300
Since it is not possible to transport more than a ton, the conventional configuration is three single-phase units. When the present invention is applied to this transformer, it is possible to manufacture a three-phase integrated transformer with a total weight of about 70%, which reduces the cost of manufacturing the transformer. In addition, since the maximum transport weight of the iron core can be kept to less than 30 tons, it is possible to transport the iron core using a general low-floor trailer, which can significantly reduce transport costs. 3 more
Due to the integrated configuration, the on-site installation space is reduced to less than half, making it possible to reduce substation construction costs, including foundation work.

As described above, according to the present invention, it is possible to transport using general low-floor trailers due to a significant reduction in transportation weight, which greatly reduces transportation costs including the cost of reinforcing roads and bridges, as well as public property and traffic obstructions such as relocation of building signal volumes. It is possible to completely eliminate any impact on general society.

Furthermore, the three-phase integrated transformer configuration minimizes the installation space for power generation and substations, making it possible to significantly reduce construction costs.

[Brief explanation of drawings]

Fig. 1 is a front view showing the configuration of a three-phase, five-leg iron core in an embodiment of the present invention, Fig. 2 is a front view showing the assembled state of the iron core, windings, tank, etc., and Fig. 3 is a side cross-section thereof. Figure 4 is a front view showing the lifting state of one core unit of the three-phase five-legged core divided into four transportation units, Figure 5 is its side view, and Figure 6 is the high and low voltage coil. , a winding cross-sectional view showing the assembly of tap coils, insulator structure, and moisture-proof film installation, FIG. 7 is a front view showing the winding in a lifted state, and FIG. 8 is a front view showing the transportation and assembly state of the iron core unit. , Fig. 9 is a side view thereof, Fig. 10 is a plan view showing the transportation and assembly state of the winding assembly, Fig. 11 is a front view thereof, and Fig. 12 is the on-load tap changer being transported while attached to the upper tank. Figure 13 is a plan view of the assembled state of the internal leads such as tap leads, etc., Figure 14 is a front view of the lower tank being transported and assembled, and Figure 15 is a site view of the transformer that has been disassembled and transported as a unit. A front view showing the configuration of a dustproof house and a movable lid that includes a dry air generator used for assembly inside the transformer room, Figure 16 is a side view thereof, and Figure 17 is a diagram showing the suspension of the iron core inside the dustproof house. FIG. 18 is a front view showing the winding hanging and the assembled state, FIG. 19 is a front view showing the completed assembly of the transformer contents, FIG. 20 is a side view thereof, and FIG. 21 is a front view showing the assembled state. The figure shows another embodiment of the present invention, and is a front view showing a lifted state of one core unit out of a three-phase five-legged core divided into two transportation units. 1...Iron core LA, LB, LC-Iron core part, upper and lower yokes IA...
・U-shaped core unit 2...Winding, 2a, 2b,
2c...low, high, tap coil 4.4a...leg,
Yoke backing plates 6a, 6b...Upper and lower winding support devices 7a, 7b...Upper and lower winding support devices 8a, 8b.
...Top, upper tightening fittings 11a-lie...Moisture-proof film 12...Tank 13...Insulating oil 15...Support device 1
5a, 15b...screw, handle 17...iron core transport tank 19...winding transport tank 19c...
Steady cylinder 22...Tap changer on load 25...Waterproof and dustproof house 26...Transformer room 2
7... Lifter 28... Dry air generator 29... Moving device 3
0...Movement guide 31...Floor agent
Patent Attorney Noriyuki ChikaFigure 1Figure 2Figure 3Figure 4Figure 5Figure 6Figure 7Figure 10Figure 11Figure 12Figure 13Figure 14Figure 17Figure 18Figure 19 Figure 20

Claims (6)

[Claims] (1) The core main leg is divided into left and right parts approximately at the center in the width direction,
The upper yoke and coil are removed to form a U-shaped core unit, and multiple U-shaped core units are installed side by side on site and windings are wound around adjacent cores to form the main landing gear. This is a disassembled transport transformer that is connected with a yoke. (2) Divide the core main leg into right and left sides at approximately the center in the width direction, remove the windings and upper yoke, divide the core into at least two or more U-shaped core units, fix the upper legs with fixing metal fittings, and transport the A transformer core that was disassembled and transported in a sealed container. (3) High-voltage, low-voltage, tap coils, etc. are assembled into a winding unit with an insulating tube on the inner and outer peripheries and an insulating plate on the upper and lower surfaces, each supported and protected, and the entire outer surface is sealed with an oil- and moisture-proof film. A transformer winding for disassembly and transportation in which the unit is inserted into a steady tube in a transportation tank and tightened vertically for sealed transportation. (4) The main tank, which houses the iron core, windings, and insulating oil, is divided into two or more parts by a horizontal flange, and internal leads such as tap leads are supported from the inside of the tank, and the tank is transported with a blind cover attached while it is assembled. Disassembled and transported transformer tank. (5) Install a waterproof and dustproof house in the on-site basement or inside the building. Inside the house, use a support device to lift the assembly of the transformer components described in (1) to (4) above from the floor and use a lifter to enable horizontal movement. A method for on-site assembly of disassembled and transported transformers. (6) Install a dry air generator to control the humidity inside the waterproof and dustproof house to a low humidity level, and insert a winding unit sealed with a moisture-proof film into the core leg inside the house. A method for on-site assembly of a disassembled and transported transformer, comprising means for removing at least the moisture-proof film near the upper surface of the winding before tightening the winding in the vertical direction.