JP2001110643A - Method for transporting and assembling winding wire for transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for transporting and assembling winding wire for transformer, with which a winding wire is firmly fixed at transporting or hanging on the job site, the assembly work at the job site is simplified and working time is reduced. SOLUTION: A winding wire unit 1Z is inserted into a cylindrical support 12a fixed in a lower tank 11b, a balancing fitting metal 3 is arranged at one end of the winding wire unit 1Z, a rod 15 between the balancing fitting metal 3 and the lower tank 11b is fastened by a fastening device 16, the winding wire unit 1Z is transported while being fixed in a transportation tank, the winding wire unit 1Z is prevented from being damaged by shocks at transportation, and the working time for integrating the winding wire unit 1Z into an iron core can be reduced substantially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transporting and assembling transformer windings, which disassemble and transport iron cores and windings of a transformer and reassemble them on site.

[0002]

2. Description of the Related Art When shipping a large-capacity transformer manufactured in a factory to an installation place, in order to ease transportation or installation conditions, the transformer is wound in a factory, in addition to a core, a split tank, or the like. In recent years, the number of transformers called disassembly / transformation transformers that adopt a method of disassembling each unit into transportable units, transporting the units to the site, and reassembling them locally has been increasing in recent years. After the end of the factory test, the windings of this disassembled and transported transformer are disassembled, and the lead wires attached around the windings are disassembled. The tank is transported to the site with the entire winding covered with a pack to prevent moisture absorption from the insulator. At the site where the transformer is to be installed, it is necessary to reassemble the parts that have been disassembled regardless of the windings and arrived in their own transport tanks.

[0003]

By adopting such a transportation mode, a single core is composed of a plurality of windings for one iron core. If they are not uniformly and firmly tightened in the axial direction, the windings may be loosened and damaged by the impact force during transportation.
For example, in JP-A-3-297105, a tubular support 5 is attached to the lower tank 3, a seat 6 is attached to the upper end of the tubular support 5, and a coil is wound on the tubular support 5 via a spacing piece 10. In a state in which the supporting plate 9 is accommodated and the support plate 9 is disposed between the winding 1 and the lower tank 3, a fastening member 7a is disposed above the winding 1 and the seat 6, and the fastening member 7a and the seat 6 After tightening the space with bolts 8, the upper tank 4 is closed and transported. When the tank is lifted by a crane or the like when a wire is hung on the tank during transportation, the tubular support 5 also swings in the same direction according to the swing of the left and right, front and back, etc., between the lower tank 3 and the tubular support 5. May be damaged.

[0004] For this reason, it is necessary to ship the structure using a structure in which the windings are firmly fixed during on-site assembly. Transport fittings, etc., have become large, securing local storage places, and taking out parts, working hours for remounting windings, etc., prolonging the local installation process and expanding the local installation space It is also a factor. Therefore, in order to reduce the installation space at the site as much as possible, it is necessary that the transporting equipment and the like to be carried in have a compact structure that can be easily reassembled by incorporating the winding into the iron core leg at the site.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transformer winding in which a winding is firmly fixed at the time of transportation and hanging on the site, a reassembly operation for assembling the winding on an iron core leg at the site is simplified, and the working time is reduced. An object of the present invention is to provide a method of transporting and assembling wires.

[0006]

In order to achieve this object, a transformer according to the present invention is characterized in that a winding is housed in a transportation tank, transported to an installation site, and combined with an iron core at the site. Insert the winding unit into the cylindrical support fixed to the lower tank, place a balance fitting on one end of the winding unit, tighten the rod between the balance fitting and the lower tank with a fastening device, The unit is transported while being fixed to a transport tank.

According to a second aspect of the present invention, the balance unit and the fixing unit are mounted on the winding unit, and the wire between the balance unit and the fixing unit is tightened to lift the winding unit in a fixed state. The winding unit is inserted into a cylindrical support fixed to a lower tank in a transport tank.

According to a third aspect of the present invention, in a state in which the winding unit is fixed and lifted, the balance fitting on which the winding moisture absorbing sheet is placed and the winding unit are fixed to the cylindrical support fixed to the lower tank in the transport tank. In addition to inserting the winding unit, the winding unit is arranged on a receiving stand fixed to the lower tank, and dry air from the receiving stand is supplied to the winding unit.

That is, according to the present invention, when the heavy winding which is vulnerable to impact is disassembled into iron core units and stored in a dedicated transport tank for transportation, the transport tank has a low height. 2 of the upper tank composed of the tank and the height within the transport restrictions
Using a tank having a divided structure, an inner diameter of the winding, that is, a cylindrical support simulating the iron core side is fixed to the inner surface of the lower tank, and an L-shaped lifting metal fitting for lifting the winding disposed at both ends of the winding. After tightening with a wire and a belt through a wire guide between the winding bracket and the balance metal fitting, the entire winding is lifted and inserted into the cylindrical support. A gap piece for adjusting the gap is arranged between them, a balance metal fitting for lifting is placed on the upper part of the winding, a rod is arranged between the balance metal fitting and the lower tank, and the rod is fixed by a tightening device provided on the rod. Tighten to secure the winding.

Thereafter, the upper tank is covered from above, and a spacing piece is inserted between the metal fitting fixed above the cylindrical support on the inner diameter side of the winding fixed to the inner surface of the lower tank and the opening of the upper tank. In addition, the gap can be filled to prevent breakage or loosening of the winding due to the impact force at the time of transportation, and the transportation size and weight can be reduced. In addition, since it is stored and fixed in a tank in a dismantled state in a tank and carried out, disassembly and assembling work at the site can be improved, and assembling time and assembling space can be greatly reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The transportation of a transformer winding according to the present invention will be described below.
One embodiment of the assembling will be described by taking a disassembly and transportation transformer as an example.

After the completion of the factory test, the internal parts are disassembled to be transported to the site. At the factory, the lead wires and the upper yoke are disassembled, and the iron legs fixed to the lower tank 20 as shown in FIG. The winding tank 1 is taken out from the storage tank 23, stored in a transport tank dedicated to winding winding, and used as a cover for the lower tank 11b and the lower tank as shown in FIGS. The tank 11a is divided into two transport tanks, and a metal cylindrical support 12a is provided on the bottom plate surface of the lower tank 11b, and a winding-dedicated cradle 7 dedicated to winding is welded around the lower part of the metal fitting at several places, or Secure with bolts.

The winding 1 and the upper and lower end insulators 22a and 22b provided at the upper and lower ends thereof and the insulating cylinders 2a and 2b are housed in a winding unit 1Z. The balance fitting 3 is arranged on the upper end insulator 22a. The balance metal fittings 3 are arranged on the outer peripheral side from the center of the winding unit 1Z, for example, at two places on the front side and the back side of the paper. The L-shaped lifting metal fittings 5 are fitted into the lower end insulator 22b at a plurality of locations, and the wire 1b is fixed between the lifting metal fittings 5 and the balance metal fittings 3 with the wires 4b, and the winding 1 is fixed. After binding the winding 1 in the direction perpendicular to the axial direction of the unit 1Z with the bands 6a, 6b, the crane 9 is attached to the wire 4a hung via the balance fitting 3.
Hook 9A and lift it up.
Extract. As shown in FIG. 2, the suspended winding 1 is covered with the balance fitting 3 and the winding 1 by a moisture absorbing sheet 10 and tied at the lower end. The moisture absorbing sheet 10 has a through hole through which the wire 4a passes.

As shown in FIG. 2, a balance metal fitting 3 for lifting a winding or a wire 4 suspended from a wire guide 8.
b, hanging the L-shaped lifting hardware 5, installing the winding unit 1 </ b> Z at a plurality of locations outside the insulating cylinder 2 b so that the winding unit 1 </ b> Z is mounted on the claw portion 5 a of the lifting hardware 5 under the winding 1, Bands 6a, 6b
Tighten and fix with. Winding moisture-absorbing sheet 1 from above lifting metal fitting 5 via wire guide 8 or balance metal fitting 3
0 The wire 4a pulled out from the upper surface is hung from the crane 9 and the entire combination winding is hung on the wire guide 8, and inserted along the axial direction of the cylindrical support 12a in FIGS. Place it on the cradle 7. The cylindrical support 12a and the winding receiving table 7 are fixed to the lower tank 11b.

A plurality of spacing pieces 13 are inserted at predetermined intervals between the cylindrical support 12a and the winding 1 to fill the gap, and as shown in FIG. The upper and lower tightening rods 1 which are set up in parallel with the axial direction of the lower tank 11b and the windings 1 so as to avoid the shape of the winding opening.
5. The balance fitting 3 for lifting the upper part by the tightening device 16
And the winding 1 sandwiched between the winding receiving stand 7 installed in the lower tank 11b is firmly tightened. That is, the rod 1
One end of 5 is fixed to the winding-dedicated receiving stand 7, and the other end is fixed at four places with pins, fixing brackets, etc. outside the balance fitting 3, and the rod 15 is tightened by the tightening device 16 to tighten. The winding and the like are fixed between the device 16 and the winding-dedicated receiving stand 7.

A piping hose 19 is used on the lower side surface of the lower tank 11b through a dry air filling valve 17, and dry air is supplied from the cooling oil introduction holes 17A and 17B inside the cylindrical support 12a and the winding lower side. The dry air is always sent between the moisture absorbing sheet 10 and the winding 1 from above the cylindrical support 12a.

Then, cover the upper tank 11a from above,
On the upper surface of the upper tank 11a, the support fitting 12b is fixedly supported by welding or bolts on the upper part of the cylindrical support 12a fixed to the bottom plate surface of the lower tank 11b, and the support fitting 12b is installed on the upper surface of the upper tank 11a. The spacer 14 is inserted into the opening, and is located between the outer support fitting 12b and the upper tank 11a.
Is inserted, and the gap between the support fitting 12b and the upper tank 11a is filled with the spacing piece 14;
1 and a detachable fixing bracket 14A is provided between the upper lid 21 and the spacing piece 14 and the upper tank 11a.
1a is closed and transported.

On the other hand, in the field, the upper tank 1
After removing 1a and removing the spacing piece 13 fixed between the winding 1 and the cylindrical support 12a, via the lifting balance 3 or the wire guide 8 used as a clamp on the upper part of the winding. The winding 1 is immediately inserted into the iron core leg 23 by lifting the entire unit using the wire 4a pulled out to the upper portion, and the work of combining the iron core leg and the winding is completed. After the completion of the work, when disassembling the winding lifting brackets, a plurality of L-shaped lifting brackets 5 are connected to each other by the wires 4b respectively supported by the wire guides 8 attached to the lifting balance bracket 3. Remove and dismantle from the lower part of the winding.

In the case of such a transportation and assembling mode, the transport tank 11a. 11b, the winding 1 is inserted into the cylindrical support 12a and the rod 15
Is fixed to the cradle fitting 7 at one end, and the other end is fixed at four places with pins, fixing fittings, etc. outside the balance fitting 3, and the rod 15 is tightened by the tightening device 16, and the tightening device 16 is fixed.
Since the winding 1 is fixed between the receiving tank 7 and the cradle 7, damage and loosening of the winding 1 can be prevented even if left and right and front and rear vibrations are applied to the winding 1. The winding 1 can be firmly fixed in 11b.

The transport tanks 11a. 11b is transported while the lifting metal fittings 5 are fitted under the windings 1b.
After removing 3.14, the wire 1a provided on the lifting bracket 5 is lifted, so that the winding 1 can be combined with the iron core leg 23. After the combination, the winding bracket 1 can be easily disassembled and installed on site. Enables removal from the assembly location,
The on-site assembling work time can be shortened, and the simplified transport structure can shorten the shipping work time at the factory and manufacture a highly reliable disassembly and transportation transformer.

Further, dry air is fed from the cooling oil guide holes 17A and 17B, and the state where dry air is always fed between the moisture absorbing sheet 10 and the winding 1 from above the cylindrical support 12a is maintained. As a result, the insulating material used for the winding 1 is always dried with dry air, so that the amount of water impregnation is smaller, the insulating material expands and contracts less than the non-dried insulating material, The force for tightening the rod 15 or the force for tightening the wire 4b between the balance metal fitting 3 and the lifting metal fitting 5 by the wire 16 is loosened, but there is little fear.

[0022]

As described above, according to the present invention, the cylindrical support for fixing the windings and the pedestal are fixed to the transport tank, and the winding unit is lifted with the balance fitting for lifting. By fastening between the metal fittings by the fastening means, it is possible to prevent breakage of the winding due to impact during transportation. In addition, since the wire can be transported with the lifting bracket and the lifting hardware attached to the winding unit, the work time for assembling the winding unit in the site under adverse environmental conditions can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an operation of extracting a winding from a core leg according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a state in which the winding of FIG. 1 is lifted.

FIG. 3 is a cross-sectional view from the center of the windings of FIGS. 1 and 2 housed in a tank.

FIG. 4 is a side sectional view of the windings of FIGS. 1 and 2 housed in a tank.

[Explanation of symbols]

1 ... winding, 2 ... insulating cylinder, 3 ... balance fitting, 4 ... wire,
Reference numeral 5: Lifting bracket, 6: Band, 7: Receiving stand, 8: Wire guide, 9: Crane, 10: Moisture absorbing sheet, 11
... tank, 12 ... cylindrical support, 13 ... spacing pieces 1, 14
... Spacing pieces 2, 15 ... Rod, 16 ... Tightening device, 17 ... Dry air filling valve, 18 ... Exhaust valve, 19 ... Piping hose, 2
0: lower tank of the body, 21: upper lid, 22: insulator at the end, 2
3 ... iron leg.

Continued on the front page (72) Inventor Yoshihisa Okumura 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Kokubu Works, Hitachi, Ltd. (72) Inventor Kazuyuki Kiuchi 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture F-term in Hitachi Kokubu Engineering Service Co., Ltd. (reference) 5E059 AA02 AA03 CC01 DD07 EE03 FF09 HH03 KK05 KK08 KK13 KK15 LL02 LL08

Claims (4)

[Claims] 1. A method of transporting and assembling transformer windings in which windings are housed in a transportation tank and transported to an installation site, and combined with an iron core, winding the windings on a cylindrical support fixed to a lower tank. Insert the wire unit, place the balance fitting on one end side of the winding unit, fasten the space between the balance fitting and the lower tank with a fastening device, and transport with the winding unit fixed to the transport tank. Transformer winding transport, featuring
Assembly method. 2. A method of transporting and assembling transformer windings in which windings are housed in a transport tank and transported to an installation site, and combined with an iron core at the site, wherein a balance bracket and a fixing bracket are mounted on a winding unit. Then, the balance unit and the fixing bracket are fastened with a fastening device, the winding unit is fixed and lifted, and the winding unit is inserted into the cylindrical metal fitting fixed to the lower tank in the transport tank. Transformer winding transportation and assembly method. 3. A method for transporting and assembling transformer windings in which windings are housed in a transport tank and transported to an installation site, and combined with an iron core at the site, wherein a balance bracket and a fixing bracket are mounted on a winding unit. Then, with the winding unit fixed and lifted with the winding unit fixed between the balance fitting and the fixing bracket, the balance fitting and the winding unit covered with the moisture absorbing sheet are placed in the lower tank in the transport tank. A transformer characterized by inserting a winding unit into a fixed cylindrical support, placing the winding unit on a receiving stand fixed to the lower tank, and supplying dry air from the receiving stand to the winding unit. How to transport and assemble windings. 4. A hose for supplying dry air or nitrogen gas from the outside of the tank to a cooling oil introduction port provided in the receiving stand, or a hose or a pipe for supplying nitrogen gas, and an inner surface of the wound moisture-proof sheet attached to the outside of the winding. 4. The method for transporting and assembling a transformer winding according to claim 3, wherein dry air or nitrogen gas is directly in contact with said winding.