JP2001102225A - Assembling method of transported disassembled transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for assembling a transformer transported being disassembled to facilitate field assembling, shortening the assembling period and enhancing the assembled quality. SOLUTION: A winding 9 is disposed on a core leg 4, to be blown with dry air 13 is covered with a moisture-proof sheet 11A, the part from the upper side of the moisture-proof sheet 11A to a lower tank 1 is covered with a moisture-proof sheet 14, the work for installing an upper yoke core 5 between core legs is carried out on a work scaffold 19 set on the moisture-proof sheet for winding simultaneously with the work for fixing a lead wire 15 to the winding 9 within the moisture-proof sheet 14 on the underside of the work scaffold 19 thus performing the assembling of a disassembled transformer transported and reassembled in the site efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the disassembly and transportation of transformers. More specifically, when a transformer manufactured in a factory is shipped to a site where it can be installed, the transformer must be installed in the factory due to transportation restrictions. It is related to the technology of disassembling and transporting units such as windings, iron cores, lead wires, and other parts and reassembling them locally.

[0002]

2. Description of the Related Art Conventionally, a transformer manufactured in a factory is disassembled into windings, iron cores, lead wires, and other units when the transformer is shipped to a site where the transformer is installed due to its transport weight. Transported and reassembled locally. The disassembled transformer windings are transported in a sealed state with a film-like pack during transportation and assembly to prevent moisture absorption of the winding insulation.

[0003] Such a large-capacity disassembly / transformation transformer combines an on-site iron core leg and a lower yoke, inserts windings into the iron leg, mounts a middle tank, and connects lead wires inside the iron leg and upper yoke combination. Since it takes a long time to complete the assembly, the drying process after the completion of removing the moisture absorbed by the insulator must be a long process, and special equipment is used to prevent moisture absorption. Was needed.

[0004]

[Problems to be Solved by the Invention] 500 kV or 1000
The insulation configuration in kV ultra-high voltage equipment (eg, transformers) improves the withstand voltage of the oil gap by subdividing the oil gap with an insulation barrier and strictly controlling the moisture in the insulator and suspended particles in the oil. We are trying to reduce the size. Therefore, winding and internal assembly work at the factory during production are performed in a dust-proof air-conditioning room that prevents intrusion of dust and moisture. The core is assembled and the lead wires are connected by opening the air conditioner, so large-scale air-conditioning equipment equivalent to the factory must be brought to the site, or if the equipment capacity is less than that, the area where the windings are exposed is minimized. And work in a short period of time.

In the moisture-proof assembling method described in Japanese Patent Application Laid-Open No. Hei 2-14503, after the windings are combined with the iron core, the middle tank is attached, and the upper part of the middle tank and the windings are covered with a moisture-proof sheet before the upper yoke is assembled. Attach the peripheral end to the middle tank, seal the winding part, combine the upper yoke, install the core fastening bracket, then carry in the lead wire and perform the on-site assembly work. It is difficult to maintain the dry state of the insulator used for the upper yoke, lead wire loading, connection work, middle tank and upper tank installation work, etc. easy.

[0006] In addition, since the work for connecting the lead wires after mounting the middle tank is limited, the workability is poor.
The time is considerably longer than the factory assembly time.

An object of the present invention is to provide a method of assembling a disassembled and transported transformer which facilitates on-site drying of windings and insulators and connection of lead wires, and shortens assembly time.

[0008]

In order to achieve the above-mentioned object, a method for assembling a disassembly / transformation transformer according to the present invention comprises disposing an iron core fastener having a flow passage in a lower tank, comprising the steps of: Multi-phase core legs are placed on top, windings are inserted into each core leg, the windings are covered with a moisture-proof sheet, and dry air from the air generator attached to the end of the core clamp is distributed. In the method of assembling the disassembly and transportation transformer in a state where the winding is supplied to the winding cooling path through the through hole provided in the iron core fastener and the winding is moisture-proof, the upper part of the winding dampproof sheet and the lower tank Is covered with a moisture-proof sheet.

[0009] Further, the present invention is characterized in that a work scaffold in which an iron core leg is inserted into a through hole is arranged on a moisture-proof sheet.

[0010] Further, a work scaffold in which iron legs are inserted into the through holes is disposed on the moisture-proof sheet, and the work of connecting the upper yoke core between the iron legs with the work scaffold is performed by connecting and insulating windings in the moisture-proof sheet. It is characterized in that work is performed simultaneously while preventing moisture absorption of the insulator.

With the above-described structure, the on-site assembly of the disassembling and transporting transformer can be facilitated and the assembling operation time can be shortened, and the drying step after the completion of the assembling can be shortened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disassembled and transport type transformer according to the present invention will be described below with reference to FIGS.

FIG. 1 shows an operation of assembling the winding 9 to the iron core leg 4. A three-phase iron core leg 4 is assembled in the lower tank 1 in advance. The lower leg yoke core 4A (FIG. 6) communicates between the core legs 4 of each phase. Lower core fastening members 6 are arranged on the left and right sides of the core legs 4 and the lower yoke core of each phase.
In this embodiment, only one side of the core clamp 6 is shown. The winding 9 is inserted into the iron leg 4 of each phase.

A flow passage 6A also serving as an oil guide and a through hole 6B communicating with the winding cooling passage are formed in the lower iron core fastening member 6. The dry air 13 is constantly fed from the flow passage 6A and the through hole 6B to the cooling passage 9A of the winding 9 by the dry air generating device 12 communicating with the end of the lower core clamp 6. A lower insulating end 8A is disposed between the lower iron core clamp 6 and the winding 9, and a through hole 6B and an oil guide hole 8 communicating with the cooling passage 9A are formed in the lower insulating end 8A.

The winding 9 is transported as it is while being covered with the moisture-proof sheet 11A for winding. When the winding 9 is combined with the iron core leg 4, the sealing bag opening 11 </ b> C of the winding dampproof sheet 11 </ b> A on the lower side of the winding just before hanging is opened, and after being hung up, it is inserted into the iron core leg 4 while being lowered. Reference numeral 11B is an openable / closable lid attached to a part of the moisture-proof sheet for winding 11A. Normally, the seal opening port 11C is transported in a closed state by tying the closing opening with a string.

The windings 9 are sequentially inserted into the iron leg 4 while blowing dry air 13 into the cooling passage 9A in the windings 9. After that, the lead wire 15 and the support 16 and the insulating material for the upper part of the winding, which take different shapes depending on the local assembly space, are transferred to the lower tank 1.
And the work of assembling the upper yoke core 5 is performed.

FIG. 4 shows the loading of a plurality of tap lead wires having a bundled structure. In the case of a large-capacity transformer, etc., since the winding diameter becomes large and the various lead wires 15 including the tap lead wire are often large and heavy due to an increase in the inter-phase distance, the lead wire etc. is dedicated as a single item. When storing in a tank and transporting, consider the transport or local loading space,
The lead wire 15 itself has a split structure,
Reducing on-site reassembly work.

For this reason, the support 16 for supporting and fixing the lead wire 15 is not disassembled from the lead wire side, but is wrapped with the moisture-proof sheet 17 while attached, and the on-site hanging bracket 3 is mounted in a small space using a balance structure. However, it is easy to carry in and stabilize the lifting method, and the transporting structure is such that the on-site hanging bracket 3 is kept attached during transportation, so that it can be immediately suspended immediately upon arrival at the site. After the accessories including the lead wires are arranged and temporarily placed in the lower tank 1, the work of inserting the iron into the upper yoke core 5 is performed.

FIGS. 5 and 6 show the work of assembling the upper yoke iron core 5. A support 1 for supporting and fixing the entire top of the winding and the lead wire 15 with a moisture-proof sheet 14 in order to prevent exposure to the outside air and intrusion of dust on the top of the winding 9.
Cover 6 A scaffold 19 for combining the upper yoke core 5 is disposed above the moisture-proof sheet 14 above. The lower end surface of the moisture-proof sheet 14 is provided with a margin to the foundation concrete surface, and the winding 9 and the lower tank 1 are sealed.
3 is always sent.

In this state, in the working scaffold 19, the upper yoke 5 is combined with the iron core leg 4 and, at the same time as the assembling work of the iron core fastener 7, the lower lead in the moisture-proof sheet 14 below the working scaffold 19 is formed. The assembling, connecting, and insulating work of the wires 15 and the like are also performed, and the assembling is completed. Therefore, in the work scaffold 19, the work of inserting the upper yoke into the iron core leg is performed. In the moisture-proof sheet 14 below the work scaffold 19, connection of lead wires,
By performing relatively time-consuming operations such as assembling at the same time, the on-site reassembly work can be advanced without absorbing the insulator, so the efficiency of disassembly and transportation transformer assembling work has been significantly improved. Alternatively, the drying process after the completion of assembly can be shortened.

Then, as shown in FIG. 7, the moisture-proof sheet 14 is moved upward to cover the iron core, the windings, and the entire lower tank, and the upper lead wire is placed while filling the inside with the dry air 13. After the support and fixing, the upper tank 2 is attached to complete the assembly inside the transformer. Upper tank 2
Has a length connected to the lower tank 1, but an intermediate tank may be arranged between the two tanks.

In this embodiment, since the lower end surface of the moisture-proof sheet 14 is hung down to the foundation concrete surface 50A, when the worker attaches the support 16 for supporting and fixing the lead wire 15 to the lower part of the winding 9, Moment proof sheet 1
Even if the user pushes 4 outward, the moisture-proof sheet 14 is also deformed accordingly. Therefore, the worker can work in an easy posture without taking an unreasonable posture, and can easily perform the mounting work. It was significantly improved.

As shown in FIG. 8, after the dry air 13 is constantly blown into the winding 9, the exhaust passage between the winding 9 or the insulating cylinder and the moisture-proof sheet 11A is wound. Although it flows to the moisture-proof sheet 14 from 14A, a work scaffold 19 is placed on the upper side of the moisture-proof sheet 14 to prevent the moisture-proof sheet 14 from soaring. Now I can work. In addition, the moisture-proof sheet 14 soars,
Or moisture-proof sheet 1 to prevent swelling
Exhaust hole (not shown) for exhausting dry air 13 in part of 4
Is formed. Further, by flowing the dry air 13 from the moisture-proof sheet for winding 11A to the exhaust passage 14A and flowing from the exhaust passage 14A to the moisture-proof sheet 14, the wind speed of the dry air 13 is reduced, so that the dry air 13 is prevented from rising or bulging. 13 is effectively used without waste.

On the other hand, by providing the work scaffold 19, the upper yoke iron core 5 shown in FIG.
It is safer and the work efficiency can be performed more efficiently compared to the case where no is provided. Also, the internal inspection work after the completion of the internal assembly does not need to be performed in a dark and narrow tank, so that accurate inspection can be performed and a highly reliable product can be provided.

[0025]

Advantages of the invention (1). As described above, according to the present invention, when assembling the windings to the iron core legs in the field assembly, dry air is immediately applied to the entire winding insulation with the moisture-proof sheet covering the windings and the winding insulation. As a result, all insulators including windings can be kept dry, and relatively time-consuming operations such as inserting the upper yoke, connecting lead wires, and assembling can be performed simultaneously. Since the on-site reassembly work can be performed without absorbing the insulator, the efficiency of the assembling work of the disassembling and transporting transformer can be remarkably improved, and the drying process after the completion of the assembling can be shortened.

(2). Since the lower end surface of the moisture-proof sheet hangs down to the lower tank, when the worker assembles, connects, and insulates the lead wire etc. existing below from the upper yoke, the worker bends and moves the moisture-proof sheet outward. Even when pressed, the moisture-proof sheet is deformed accordingly, so the worker can work in a comfortable posture without taking an unreasonable posture, making installation work easier and work efficiency significantly improved compared to the conventional technology. .

[Brief description of the drawings]

FIG. 1 is an assembly view showing a state in which windings on iron core legs of an exploded transport transformer according to an embodiment of the present invention are combined.

FIG. 2 is a sectional view in which the winding used in FIG. 1 is covered with a moisture-proof sheet for winding.

FIG. 3 is a partial cross-sectional view in which dry air is sent into a flow path near the iron core fastener and windings of FIG. 1;

FIG. 4 is a cross-sectional view showing a lead-in combination operation of the disassembled and transported transformer of FIG. 1;

FIG. 5 is a cross-sectional view showing an operation of assembling the upper yoke of the disassembly / transformation transformer of FIG.

FIG. 6 is a partial sectional view of the disassembled transport transformer of FIG. 5 as viewed from the right.

FIG. 7 is a sectional view showing an upper tank assembling operation of the disassembly / transformation transformer of FIG. 5;

FIG. 8 is a side cross-sectional view of FIG. 5 in which the work scaffold is removed and the moisture-proof sheet is covered with the winding moisture-proof sheet.

[Explanation of symbols]

1 ... Lower tank, 2 ... Upper tank, 3 ... Hanging bracket, 4
... iron legs, 5 ... upper yoke iron plate, 6 ... lower iron core clamp, 7 ... upper iron clamp, 8 ... oil guide hole, 9 ... winding, 1
DESCRIPTION OF SYMBOLS 1 ... Moisture-proof sheet for windings, 12 ... Dry air generator, 13
... dry air, 14 ... moisture-proof sheet, 15 ... lead wire, 16
... support, 17 ... moisture proof sheet for lead wire, 18 ... wire for lifting, 19 ... working scaffold.

Claims (3)

[Claims] An iron core clamp having a flow passage is disposed in a lower tank, a plurality of phases of iron legs are arranged on the iron core clamp, a winding is inserted into each iron leg, and the winding is wound. Dry air from the air generator attached to the end of the core clamp is blown into the flow passage, and supplied to the cooling path of the coil through the through hole provided in the core clamp. A method for assembling a disassembly / transformation transformer in a moisture-proof state, comprising covering from the upper side of the moisture-proof sheet for winding to the lower tank with a moisture-proof sheet. 2. The method for assembling a disassembled and transported transformer according to claim 1, wherein a work scaffold having an iron core inserted into the through hole is disposed on the moisture-proof sheet. 3. A work scaffold having a core leg inserted in a through hole is disposed on a moisture-proof sheet, and the work of connecting the upper yoke core between the core legs on the work scaffold is performed by leading winding to the winding inside the moisture-proof sheet. 2. The method for assembling a disassembled and transport transformer according to claim 1, wherein the connecting and insulating operations of the wire are performed simultaneously while preventing moisture absorption of the insulator.