JP2509731B2 - Disassembled transport transformer and its transportation and assembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a disassembling transportation transformer and its transportation, which significantly reduces the capacity of transformers and the transportation weight of large transformers. It is about legislation.

(Prior Art) In recent years, along with the increase in power demand, the power transmission system has become higher in voltage such as 500 KV transmission, and the transformer used for power transmission has also become larger in capacity. Also, the transmission distance has been maximized,
The transformers are also often installed in mountainous areas where the transportation conditions are more severe, and it is necessary to greatly reduce the transportation size and weight.

For transformers conventionally installed in such places, for example, in the case of a three-phase transformer, it is configured as three single-phase transformers and transported separately, and each is transported locally by a three-phase batch tank or a common duct. There is a division transport transformer configured as a three-phase transformer by connecting and connecting the above single-phase transformers and performing three-phase wiring.

Furthermore, the transformer assembled in the factory is disassembled and subdivided into parts such as iron core legs, iron core upper and lower yokes, windings and split tanks.
There is a subdivision transport transformer method that reassembles these on site.

(Problems to be solved by the invention) When a transformer of 300 MVA class is configured with a split transportation transformer method, it is common to divide it into 3 divisions due to the local installation space and the economical efficiency of the transformer, etc., and reduce the transport weight to about 60 tons. It is the limit to do. Therefore, there is a problem that road reinforcement work including reinforcement of large bridges is required for local trailer transportation after rail or ship transportation, and enormous transportation cost is required.

On the other hand, a subdivided transport transformer can be transported from the factory to the site without a road reinforcement by a general trailer, but the weight exceeds 100 tons after the iron core legs are laid down and the lower yoke is stacked at the site as in the factory assembly. Large-scale upright equipment such as upright iron core and foundation work to support and install it will be the cost.

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

An object of the present invention is to directly transport the transportation size and weight of a partial unit for large-capacity, large-sized transformers to be transported from a factory to a local site by a general trailer, thereby significantly reducing the transportation cost, and thus the main configuration of the transformer. The core reassembly parts are minimized by dividing parts such as iron cores, windings, and tank mounting parts, or by transporting them as a unit structure, simplifying local assembly equipment, ensuring assembly quality and drastically shortening assembly time. In addition, the purpose of the present invention is to provide a disassembling transportation transformer and a transportation and assembling method for the winding and local assembling equipment, which further simplifies the assembling equipment and simplifies the quality of the on-site content drying process, and improves the quality. To do.

[Structure of Invention]

(Means for Solving the Problems) The present invention implements the following technical means in order to achieve the above object. That is, the main leg on which the winding of the transformer iron core is mounted is divided approximately at the center of the width, and the iron core is transported to the site by extracting the winding and the upper yoke and transporting as a U-shaped divided iron core unit.

The winding is constructed as a winding unit that combines a high-voltage coil, low-voltage coil, tap coil, etc., and can be handled for transportation, etc., and the outer surface is sealed with a moisture-proof film for transportation or on-site assembly work. .

The iron core, windings, inner leads, tanks, etc. are transported by sealing the dry air to minimize the decomposition range for transportation.

Assemble the contents of the transformer in a dustproof house that is dust-proof and humidity-controlled in all weather conditions. The ceiling of the dustproof house will be constructed so that it can be opened and closed because the windings sealed with iron core units and moisture-proof film are suspended.

(Operation) With this structure, the core is divided into the main legs of the core, so that the core is transported as a U-shaped core unit during transportation. For example, the maximum weight of a 300 MVA class transformer, which is the maximum weight of a three-phase five-leg iron core, is divided into four cores, and the size and weight are about 25 tons, which is less than 1/4.

By supporting and fixing the inner and outer circumferences of the winding with insulating cylinders and the upper and lower surfaces with insulating plates, the winding can be lifted as an assembled winding unit for handling. Therefore, on-site assembly of complicated insulators inside the winding is not required, and the construction period can be greatly shortened. Furthermore, by sealing the outer surface of the winding assembly with a moisture-proof film, the dry condition before transportation at the factory can be ensured even during the on-site assembly work, so that no special drying process after assembly is required. In addition, the moisture-proof film completely prevents foreign matter and dust from entering the inside by the winding that creates a high electric field during on-site assembly work, thus ensuring local assembly quality.

For the core and winding, which are the most important parts in transformer performance, only the upper yoke of the core is the part to be disassembled and transported, and the others are transported as they are assembled as a unit. As a result, it is possible to minimize on-site work with performance and quality deterioration.

The transformer tank shall be transported in at least two parts. As long as the transport limit allows, the upper tank will be transported with the tap changer and bushing under load attached. At least the inner lead is supported from the inner wall of the tank so that it can be assembled and transported together with the tank without being disassembled to minimize local contents assembly, shorten the construction period, and improve quality assurance.

An all-weather waterproof and dustproof house with a part of the ceiling that can be opened and closed is assembled on the foundation. Inside the transformer, the contents of the transformer and the tank are assembled. A dry air generator is connected to the waterproof and dustproof house to control the internal humidity to a low humidity level of approximately 50% or less and suppress the absorption of moisture by the insulator. The iron core units and windings are hung by a tow truck in the dustproof house, but at this time the dustproof house ceiling can be opened and closed temporarily. Water proofing, dust proofing The humidity and dust level in the house are managed to ensure local assembly quality, but sometimes a high electric field is generated and the winding most important for ensuring transformer quality is inserted into the iron core and the upper yoke stacking is completed Keep the sealed state with the moisture-proof film until just before the winding tightening work in the final assembly process. Therefore, it is possible to minimize the moisture absorption of the insulating material inside the winding and to completely prevent the intrusion of foreign matter and dust, so that a high quality transformer winding can be assembled.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show the internal assembly structure and tank of a three-phase transformer that employs a three-phase five-leg iron core. 3-phase 5-leg iron core 1 has winding 2
By dividing each of the three main legs 1a to be mounted at the center in the width direction, four frame-shaped iron core units 1A composed of the two main legs 1a and the upper and lower yokes 1b and 1c are formed. , The core units 1A are arranged side by side with a slight gap.

4 and 5 are views showing the transportation and assembly state of the iron core unit 1A. The upper yoke 1b is removed and the leg plates 4 and the yoke plate 4a are placed on both sides of the main leg 1a and the lower yoke 1c. U-shaped iron core unit after tightening and binding are integrated with
1A. When hoisting and handling this, the hanging metal fittings 9 with hanging ears are fitted and fixed to the left and right leg contact plates 4 with pins or the like. As shown in FIGS. 2 and 3, four U-shaped iron core units 1A are fitted and fixed to the lower content support device 6b of the three-phase integrated structure fixed to the bottom surface of the lower tank 12b. Inserting the windings 2 into the main legs 1a arranged next to each other, assembling them, stacking the upper yokes 1b, and further stacking the upper yokes 1b on both sides of the main support 1a
Attach 6a and tighten with bind tape 5a. Winding 2
The lower surface 2A of the winding support block 7b is placed and supported 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 from the upper content support device 6a with a hydraulic jack or the like (not shown), and then the upper winding support block 7a is set. Here, since the upper and lower yokes 1b and 1c and the upper and lower content support devices 6a and 6b are strongly connected by the leg support plate 4, the winding wire 2 is clamped and fixed vertically between them.

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

The winding 2 has insulating cylinders 10a and 10b on the inner and outer circumferences and an insulating plate 1 on the upper and lower surfaces.
The coils are supported and fixed by 0c and 10d, and various coils are provided with insulating parts both in the radial direction and in the vertical direction to secure electric insulation strength to support and fix each coil.

As shown in FIG. 6, the outer surface of the winding 2 is covered with a moisture-proof film 11a.
Seal with ~ 11e. Moisture-proof fill 1 inside and outside of winding 2
Install 0a and 10b at the winding assembly stage,
c, 10d, moisture-proof film 11c on the surface and coil outlet
For 11e, after the improvement test, the contents are oil-dried and the winding 2 is removed from the iron core 1 and then executed.

When the winding wire 2 hermetically sealed by the moisture-proof film is lifted and handled, as shown in FIG. 7, a wire hanging metal fitting 15 is applied to the lower surface of the lower insulating plate 10d and is lifted by a hanging wire 14. At this time, the guide 15a is arranged above the winding 2, and the hanging metal fitting 15 and the hanging wire 14 are fixed to the unit of the winding 2 by the fixing band 16.

As shown in FIG. 3, the tank 12 which 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 transportable weight of general low-floor trailers is about 30 in terms of transport weight.
The ton has a width of 3.2 m, a height of 3.6 m, and a length of 9 m.

8 and 9 show the transport assembly structure of the iron core unit 1A.
After the factory test, the iron core is disassembled into U-shaped iron core units 1A, and the hanging metal fitting 9 is attached to the upper opening side to secure the dimensional accuracy between the left and right main legs 1a. The transport tank 17 is divided at a position close to the floor to facilitate the work of fixing the iron core unit 1A. Vibration prevention fittings 17c, 17d are attached to the upper and lower parts inside the transportation tank 17, and wedges 18a, 18b and the like are inserted between the transportation core 17 and the iron core unit 1A to shake the iron core unit 1A in the front-rear, left-right direction. Further, dry air or the like is enclosed in the sealed tank 17.

10 and 11 show the transportation and assembly structure of the winding 2 unit. After the factory test, the outer surface of the winding 2 is finally hermetically sealed with the entire surface moisture-proof film 11a to 11e as shown in FIG.
Pay in 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. Winding 2 and fixed cylinder 19c
A spacing piece 21c is circumferentially arranged and fixed between and.

Space pieces 21a and 21b are attached to the upper and lower sides of the winding 2, and a fastening plate 20 is fixed to the upper part of the circular cylinder 19 with bolts or the like to fasten the winding 2.

Further, dry air or the like is enclosed in the sealed tank 19. The transformer tank 12 and internal leads 23 are shown in Figs.
1 shows a transport assembly configuration of a load tap changer 22 and the like.

The upper tank 12a is provided with a bushing, a tap changer 22 under load, and the like related to the assembling of the contents of the transformer, as long as the transportation limit allows. At least the tap lead 23a connected to the load tap changer 22 and the bushing lead 23b connected to the bushing are transported with the lead support 24 fixed to the inner wall surface of the tank and attached to the upper tank 12a.

In the lower tank 12b, the lower contents supporting device 6a is similarly provided.
And insulators are stored and transported. Further, after sealing with a blind plate 12d, dry air or the like is enclosed inside the lower tanks 12a and 12b.

Figures 15 and 16 show the construction of an all-weather waterproof and dustproof house 25 used for on-site assembly of a transformer. The ceiling 25b has a structure such as a bellows method that can be partially slidably opened and closed, and a movable protective cover 26 is attached below the ceiling seam or the opening 25A.

The dustproof side wall 25a is fixed to the foundation 30 with fixing bolts 31 and the like, and the upper portion of the dustproof side wall 25a is fixed to the foundation 30 with a fixture 29. A dry air generator 28 or the like is connected to the waterproof / dustproof house 25 in order to maintain a low humidity inside.

FIGS. 17 and 18 show the assembled state of the iron core 1 and the winding 2 inside the waterproof and dustproof house 25.

The lower tank 12b is installed on the foundation 30, and the dustproof sheet 27 and the assembly worktable 32 are arranged around this. The U-shaped iron core unit 1A transported by the disassembly trailer from the factory and the winding 2 sealed with the moisture-proof film 11 are suspended from the transport tank by the wrecker 33 or the like and suspended in the dust-proof house 25 to assemble the contents.

19 and 20 show the assembled state of the contents of the transformer body.
Here, the main body tank 12 is assembled at least in a waterproof and dustproof house 25. The taps and bushing leads 23a, 23b supported and fixed on the inner surface of the tank 12 and the leads of the winding 2 are connected from the tank opening 12c.

The three-phase five-leg iron core shown in Fig. 1 is, for example, in a transformer for a 275KV substation with a maximum capacity of 450MVA, the iron core assembly weight exceeds 100 tons, but it is separated at the main leg 1a part, and the U-shaped iron core as shown in Fig. 8 is used. Transport tank 17 by dividing into units 1A and transporting
It will be about 25 tons including the weight, and it will be possible to greatly reduce the transport weight to about 1/4 or less. Transport dimensions are 2m width, 3m length, 3.5m
It can be manufactured within the height and can be transported from the factory to the site with a general low-floor trailer. The iron core unit 1A is first constructed into the U-shaped iron core unit 1A shown in Figs.
By arranging them individually, the three-phase five-leg iron core shown in FIGS. 1 and 2 can be obtained. By ensuring the gap 3 between the iron core units 1A, incomplete contact and magnetic flux linkage are eliminated. As shown in FIGS. 2 to 5, the main leg 1a, the upper and lower yokes 1
B and 1c are bound with the glass tape 5a, respectively, to secure strength and rigidity for lifting and transportation. Further, the iron core tightening metal fittings 8a, 8b fixed to the leg support plate 4 are arranged on the upper and lower outer surfaces of the upper and lower yokes 1b, 1c to support the weight of the iron core during winding of the iron core, winding tightening force, or short-circuit mechanical force. . Further, since each iron core unit 1A is suspended and fixed to the lower content support device 6b inside the lower tank 12a, the winding tightening force acting between the lower content support device 6b and the upper support device 6a and a short-circuiting machine at the time of an accident The force can be strongly supported via the leg rest plate 4.
Each core unit 1A that is hoisted or transported in a U shape is shown in Fig. 4,
As shown in FIG. 5, FIG. 8 and FIG. 9, hanging metal fittings 9 are fitted and attached to the backing plate 4 on both upper side surfaces of the left and right legs 1a, so that the dimension between both legs can be fixed constantly. Therefore, it is possible to prevent an unreasonable load from being applied to the core punching and joints during lifting and transportation. In addition, the iron core unit 1A being transported is securely fixed in the front, rear, left, and right directions to the upper and lower transportation tanks 17a, 17b with the anti-vibration metal fittings 17c, 17d by the spacing pieces 18a, 18b such as wedges. It is possible to prevent the occurrence of damage or loosening without increasing or colliding with the unit 1A and the transport tank 17.

Since the winding 2 shown in FIG. 7 is supported and fixed on the upper and lower surfaces by the insulating plates 10c and 10d and the inner and outer peripheral surfaces by the insulating cylinders 10a and 10b, the winding 2 as a whole is lifted or handled collectively as shown in FIG. Even if the above procedure is performed, each coil will not be overloaded, and even if the suspending metal fitting 15 or the suspending wire 14 is attached, it does not come into direct contact with the winding 2 and is not damaged.

Since the electrical stress inside the winding 2 is the most severe,
A large number of insulators are complicatedly arranged. Therefore, if foreign matter or dust is mixed in the winding 2, or the insulator absorbs moisture, the quality of the transformer is deteriorated, and a large-scale on-site drying process is required.

According to the present invention, in order to solve the above problems during disassembly and transportation and on-site reassembly work, the outer surface of the winding 2 is entirely sealed with a moisture-proof film 11. The attachment of the moisture-proof films 11a and 11b on the inner and outer circumferences of the winding wire 2 is performed at the winding assembly stage. By using a polymer material with excellent oil resistance and heat resistance for the film material, it can be used as is without being removed even after on-site assembly. Generally, the withstand voltage and corona characteristics of the film material are several times stronger than the insulating paper used in the winding 2, and the insulating characteristics are not deteriorated. The moisture-proof films 11c to 11e on the upper and lower surfaces of the winding wire 2 and the coil lead-out lead portion are attached after the winding wire 2 is removed from the iron core 1 for disassembling and transporting after drying the contents after completion of the listing test. The joint between the moisture-proof film 11 and the moisture-proof films 11a and 11b previously attached to the inner and outer circumferences of the winding 2 is performed by a connecting film tape. The moisture-proof films 11c to 11e are removed at the on-site assembly stage to secure the cooling oil flow path inside 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.

Winding 2 with moisture-proof film 11 attached to the inner and outer circumferences is a core unit
1A is suspended and fixed in the lower tank 12a, and then inserted into each leg 1a. The lower surface of the winding 2 is supported by the surface of the lower core yoke 1c and the lower content support device 6b. After assembling the upper yoke 1b and the upper content supporting device 6a, the winding 2 is tightened with a predetermined load from the upper content supporting device 6a by a jack or the like.
Set and fix. This tightening force is applied to the upper and lower contents support device.
It is held by the strength of the leg support plate 4 connecting the 6a and 6b.

After completion of the factory test, the winding 2 is taken out from the iron core 1 in the assembled state shown in FIG. 7 and a moisture-proof film 11 is attached to the upper and lower surfaces thereof to completely seal the outer surface. The pre-sealing winding 2 is dried and finally sealed while blowing dry air, so that the water content of the insulation in the winding 2 can be controlled to 0.5% or less. By using a polymer film material for the moisture-proof film 11, it is possible to suppress water permeation during transportation or on-site assembly to a negligible value.

As shown in FIGS. 10 and 11, the winding 2 is transported by inserting the winding 2 into a circular swinging cylinder 19c fixed to the bottom of the transport tank 19 and swinging horizontally.

The tightening plate 20 fixed to the upper part of the anti-vibration cylinder 19c uniformly tightens with a predetermined pressure so as to prevent the winding 2 from loosening due to vibration and impact force during transportation, and performs vertical anti-vibration. Lower transport tank 19b,
Support spacing pieces 21a and 21b are equally distributed between the tightening plate 20 and the winding 2 to support and fix the winding 2, and when the winding 2 is lifted, a space between the spacing pieces 21a is provided. Use it to set the hanging bracket 15.

In addition, the winding assembly transportation specifications of the 275KV450MVA class transformer are 25 tons or less in weight and 2.5m wide, 2.5m long, and 3m high or less in size, and can be transported from the factory to the site by a general low floor trailer.

Tank 12, internal leads 23a, 23b and tap changer under load
The disassembly and transportation of 22 etc. are shown in Figs. 12 to 14. By supporting and fixing the tap lead 23a and the bushing lead 23b on the inner surface of the tank 12, the internal lead assembling work at the time of on-site assembly can be performed only by connecting with the coil lead-out lead or connecting with the bushing that is unavoidably removed and transported. limit. Therefore, it is possible to minimize the moisture absorption level of the insulation of the winding 2 and the insulation absorption level of the inner leads 23a and 23b during the connection work.

The transformer main body that has been divided and transported with the above minimum number of divisions is No. 16
Assemble in the local waterproof and dustproof house 25 shown in the figure. This waterproof / dustproof house 25 is generally outdoor and assembled so that
All weather type with windproof structure and iron core unit 1A from the ceiling surface
In order to suspend the winding 2, the winding 2, the upper tank 12a, and the like, the ceiling 25b is formed in a bellows system so that the opening 25A can be slid and opened. By fixing the lower end surface of the outer wall 25a on the foundation 30 with fixing bolts 31 etc. and sealing it with caulking material and fixing the upper side to the foundation 30 with the fixing tool 29, etc., a waterproof and dustproof house 25 that can withstand a strong wind of 40 m. Can be configured. Further, since the dry air generator 28 is attached to the waterproof / dustproof house 25, it is possible to always keep the humidity in the waterproof / dustproof house 25 at a low temperature state of 50% or less without being restricted by the outdoor weather.

A protective cover 26 that can be moved to the lower surface of the ceiling 25b is attached and moved according to the position of the ceiling opening 25A. When opening and closing the opening and opening the opening 25A, the foreign matter and dust adhering to the outer surface of the ceiling 25b is transformed by the transformer. Prevents mixing into the contents.

Assembly of the iron core unit 1A and the winding 2 in the waterproof / dustproof house 25 is shown in FIGS. 17 and 18. The tow truck 33 suspends the upper parts from the transport tank. For heavy objects of 25 tons or less, the work radius is around 10 m, and the lifting work is 80 tons.
It is possible to secure sufficient lifting strength, operating performance, etc. by using. In addition, the workbench 32 is set around the transformer installed in the waterproof / dustproof house 25, and the iron core 1,
The contents of the winding 2 etc. are assembled. The winding wire 2 sealed with the moisture-proof film 11 is inserted and set on the main shaft 1a of the iron core 1 in a sealed state. If the upper yoke 1b of the iron core 1 and the upper content supporting device 6a are assembled, the iron core 1 and the winding 2 can be assembled only by tightening the winding 2. Removal of the moisture barrier films 11c to 11e on the upper and lower surfaces of the winding 2 is performed at this stage. That is, the space between the upper surface of the winding 2 and the lower surface of the upper yoke 1b is used to lower the insulating plate 10 of the winding 2.
Attach a jack to d or the bottom of the tank to remove the bottom moisture-proof pack 11c and attach the winding support block 7a that supports the winding 2 from the lower content support device 6a and the lower yoke 1b surface Jack down 1 Final set I do. The final winding 2 tightening work is performed by removing the moisture-proof film 11d on the upper surface and the moisture-proof film 11e exposed from the coil.

Assembling the main body tank 12 and the inner leads 23a, 23b as shown in FIGS. 19 and 20 in the dustproof house 25, and if the vacuuming process is started, the winding 2 and the moistureproof films 11c to 11e are removed from the main body tank. 20 to 25KV 450MVA class transformer until evacuation
Work is completed in less than an hour. With the conventional voltage of 275KV or more, the allowable exposure time of the contents of the transformer is 50 hours. According to this method, even if the disassembling and on-site reassembly is performed, the time is as short as or less than the contents exposure time of the conventional special 3-phase transformer during the on-site assembly. It is possible to Since the moisture absorption level of the insulator is sufficiently small, no special on-site drying process is required. The assembly of the transformer main body is completed by evacuating the main body tank 12 and injecting the insulating oil 13.

The following effects can be obtained by employing the disassembling and transporting transformer and the transporting and assembling method thereof according to the present invention described in the above embodiments.

(1) The three-phase five-leg iron core 1 as shown in FIG. 1 is divided into four iron core units 1A for transportation by adopting a structure in which the main leg 1a on which the winding 2 is mounted is separated left and right at the center. It is possible to reduce the transportation weight and the transportation dimension to 1/4 or less of the integral type three-phase five-leg iron core. Therefore, a 450MVA class transformer with the maximum capacity in the mouth for a 275KV substation will have a maximum weight and weight of about 25 tons even for an iron core with dimensions, and it will be possible to transport directly from the factory to the site by a general low-floor trailer. This makes it possible to drastically reduce transportation costs and install large-capacity transformers at mountain substations where heavy goods could not be transported.

(2) As shown in FIG.
Since the upper and lower surfaces of a and 10b are collectively supported and fixed by the insulating plates 10c and 10d, respectively, the coils 2a and 2b can be collectively lifted and handled as the winding 2 without being disassembled. Therefore, the winding characteristics and quality after the factory test will not be deteriorated even by disassembling, transporting and reassembling by absorbing moisture in the insulator and preventing foreign matter from entering. Even when disassembling, hoisting, and reassembling work, the winding 2 is completely protected by covering the insulating cylinders 10a and 11b with the insulating plates 10c and 10d, so that damage during the work can be physically prevented.

The entire outer circumference of the winding 2 is sealed with a moisture-proof film 11 so that the sealed state is maintained until the final stage of on-site content assembly. Therefore, it is possible to minimize the moisture absorption level of the winding insulation material during the transportation or on-site reassembly process. Furthermore, it is possible to prevent dust and foreign matter from entering, and it is possible to prevent the quality of the winding wire 2 from being deteriorated at all, and it is possible to secure the same quality as that of the conventional integrated transformer. By removing the moisture-proof film 11 only at the upper and lower surface portions, the work becomes easy. By using a polymer film material for the moisture-proof film 11, it is possible to further improve the quality of the moisture-proof film 11 in terms of heat resistance, oil resistance, insulation strength and the like compared to insulating paper.

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

(3) Tap lead 23 as shown in FIG. 12 and FIG.
a, bushing leads 23b, etc. are supported and fixed on the inner surface of the tank 12, and the parts to be disassembled and reassembled are limited to only the connection parts with the coil lead-out leads. The water content removal process and the drying process in can be simplified.

(4) On-site assembly work that involves the exposure of the contents of the iron core 1, winding 2, tank 12, etc. is an all-weather type in which a humidity control device such as the dry air generator 28 shown in Fig. 15 is attached and the humidity is controlled to about 50% or less. Since it is carried out in the waterproof / dustproof house 25 to minimize the moisture absorption of the insulating material and prevent the foreign matter, dust and the like from being mixed into the contents, it is possible to assemble the transformer with high quality. Further, since the ceiling 25b of the waterproof / dustproof house 25 is configured so that it can be partially slidably opened / closed, the above-mentioned assembly parts can be easily suspended by the wrecker 33 in the waterproof / dustproof house 25. By placing the workbench 32 in the waterproof / dustproof house 25, which is a work for high places, such as the work for inserting the winding wire 2 and the work for stacking the upper yoke 1b, safe and reliable work can be performed.

 Next, another embodiment of the present invention will be described.

FIG. 21 shows an example of assembling or disassembling and transporting a three-phase five-leg iron core in a two-divided configuration. This is used for medium-capacity transformers, etc. where the transport weight does not matter but the transport length needs to be reduced. Since the disassembled part is further reduced, the transportation cost can be reduced and the on-site assembly period can be shortened.

Further, FIG. 1 is an example of a three-phase five-leg iron core, a single-phase three-leg,
The same effect can be obtained with a single-phase four-leg and a single-phase five-leg iron core by the same disassembly configuration.

〔The invention's effect〕

As described above, according to the disassembly transportation transformer and the transportation and assembling method thereof according to the present invention, taking a three-phase transformer as an example, a three-phase five-leg iron core is divided into four U-shaped iron cores and assembled and transported. It is possible and local assembly can be limited to the upper yoke part only. In addition, after the factory test, the windings can be disassembled into high, low pressure, tap coils, etc. without disassembling and reassembling as a unit. It is possible. In addition, the winding is sealed with a moisture-proof film and assembled as it is, the moisture-proof film is not removed until the final stage of the internal assembly, the internal lead is supported inside the tank and built-in for transportation, and the on-site assembly is dust and humidity controlled all weather type Since it can be implemented in a waterproof and dustproof house, the local drying process can be simplified and a highly reliable transformer can be provided.

On the other hand, the transport weight of transformers can be reduced to about 60 tons even with a 275KV 300MVA class transformer in the conventional split type transformer due to the installation space and the economical efficiency of the transformers. Including it cost a huge amount of money and time. According to the present invention, even in the case of a 275KV substation for a maximum capacity 450MVA class transformer, the transport weight can be set to about 25 tons, so that it can be transported from the factory to the site by a general low floor trailer without road reinforcement. It will be possible.

Further, the conventional split type three-phase transformer has three single-phase three-leg iron cores.
Since it has the same structure as the leg iron core, and the weight of the iron core and the number of blanks can be reduced to about 2/3 or less, it is possible to provide a compact material junction transformer.

In addition, 600M for large capacity pumped storage power plant constructed in mountainous area
In the case of a VA class large capacity transformer, the split method requires a transport weight of about 50 tons and must be composed of 6 or more unit transformers, which greatly increases the transformer installation space. In the present invention, the transportation weight is set to 30 tons or less, the transportation cost can be reduced by using a general low-floor trailer, and the transportation cost can be reduced, and the transformer installation space can be reduced to 1/2 or less of the conventional division method in order to configure the three-phase integrated transformer. Is possible. In mountainous pumped storage power plants, the transformers are installed in the underground building as well as the generators, so reducing the transformer installation space will enable huge reductions in power plant construction costs.

A large capacity transformer for a 500KV substation, for example, when a 1000MVA transformer is transported as a three-phase integrated type, the transport weight exceeds 300 tons and cannot be transported. When the present invention is applied to this transformer, a three-phase integrated structure transformer can be manufactured, the total weight is about 70%, and the transformer manufacturing cost can be reduced. Also, since the maximum core weight, the iron core weight, can be kept below 30 tons, it will be possible to use a general low-floor trailer to significantly reduce transportation costs. Furthermore, the three-phase integrated configuration reduces the local installation space to less than half and reduces the substation construction cost including foundation work.

As described above, according to the present invention, a general low-floor trailer can be transported by significantly reducing the transportation weight, and the transportation cost including the road and bridge reinforcement work cost can be significantly reduced, and the public signal and the traffic obstacle such as the relocation of the building signal device can be achieved. It is possible to completely eliminate the impact on the general public.

In addition, the construction of a three-phase integrated transformer will minimize the installation space of the substation and will enable huge reductions in construction costs.

[Brief description of drawings]

FIG. 1 is a front view showing the structure of a three-phase five-leg iron core in one embodiment of the present invention, FIG. 2 is a front view showing the assembled state of the iron core, windings, tank, etc., and FIG. Fig. 4 is a front view showing the lifting state of one of the three-phase five-leg iron cores divided into four transport units, Fig. 5 is its side view, and Fig. 6 is a high and low voltage coil. , A cross-sectional view of a winding showing the assembly of a tap coil and the like, an insulation structure, and mounting of a moisture-proof film, FIG. 7 is a front view showing a suspended state of the winding, and FIG. 8 is a front view showing a transportation assembled state of iron cores. FIG. 9 is a side view thereof, FIG. 10 is a plan view showing a transportation and assembly state of winding assembly, FIG. 11 is a front view of the same, and FIG. 12 is a tap changer under load which is transported while being attached to an upper tank. Fig. 13 is a front view showing the assembled state of internal leads such as taps and tap leads, Fig. 13 is its plan view, and Fig. 14 is the lower tank. Front view showing the transportation assembly state of
Fig. 15 is a front view showing the structure of an all-weather dustproof house with a dry air generator used for the on-site assembly of transformers that have been disassembled and transported in units, Fig. 16 is a side view thereof, and Fig. 17 is a diagram showing the inside of the dustproof house. Fig. 18 is a front view showing the iron core hanging and the assembled state, Fig. 18 is a front view showing the winding hanging and the assembled state, Fig. 19 is a front view showing the transformer contents assembled state, and Fig. 20 is its side view. FIG. 21 is a view showing another embodiment of the present invention and is a front view showing a lifting state of one of the three-phase five-leg iron cores divided into two transportation units. 1 …… Iron core 1a, 1b.1c …… Iron core, upper and lower yokes 1A …… U-shaped iron core unit, 2 …… Winding, 2a, 2b, 2c …… Low, high, tap coil 4, 4a …… Legs, yoke pad 6a, 6b …… Upper, lower content support device 7a, 7b …… Upper, lower winding support device 8a, 8b …… Upper, lower tightening metal fittings 11a to 11e …… Moisture-proof film, 12 …… Tank 13 …… Insulating oil, 17 …… Iron core transport tank 19 …… Winding transport tank, 19c …… Anti-vibration cylinder 22 …… Load tap changer 25 …… Waterproof, dustproof house, 27 …… Dustproof sheet 28 …… Dry air generator

Claims (1)

(57) [Claims] 1. An iron core main leg is divided into left and right parts at substantially the center in the width direction, at least two U-shaped iron core units are separated by removing a winding and an upper yoke, and the upper legs are fixed by fixing fittings. The process of housing the transport tank and sealing and transporting it is combined with high, low pressure, tap coil, etc. to assemble it as a winding unit in which the inner and outer circumferences are insulated with the insulating cylinder, and the upper and lower surfaces are supported and protected with insulating plates. Seal the seal, insert this winding unit into a vibration isolation cylinder in the transport tank, and tighten vertically to seal and transport, and divide the main body tank containing the iron core, windings, and insulating oil into two or more parts with a horizontal flange. Internal leads such as tap leads are supported from the inner surface of the tank, and the process of transporting the tank with the blind cover attached to the tank as assembled, and waterproofing the combination seal of transformer inside corner assembly and split tank on site, Steps to be carried out inside the dust house, steps to control the humidity inside the waterproof and dustproof house to maintain a low humidity level, and insert the winding unit sealed in the waterproof and dustproof house into the iron core leg while being sealed with a moistureproof film. A method for transporting and assembling the disassembling and transporting transformer, wherein the moisture-proof film at least near the upper surface of the winding is removed before the winding is tightened in the vertical direction.