CN112349495B - Split type iron core binding process method for large converter transformer - Google Patents
Split type iron core binding process method for large converter transformer Download PDFInfo
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- CN112349495B CN112349495B CN201910726031.8A CN201910726031A CN112349495B CN 112349495 B CN112349495 B CN 112349495B CN 201910726031 A CN201910726031 A CN 201910726031A CN 112349495 B CN112349495 B CN 112349495B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
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Abstract
The invention relates to a split iron core binding process method for a large converter transformer. The method comprises the following steps in sequence: transversely placing a U-shaped iron core comprising a side column and a semicircular core column; shaping the silicon steel sheets of the semicircular core column, and fixing by using a shaping mechanism; fixing the semicircular core column through a fixing tool; temporarily binding the semicircular core column and the side column of the U-shaped core column by using a temporary binding band; erecting the U-shaped iron core and removing the shaping mechanism on the semicircular core column; binding the U-shaped iron core by using a weftless tape, and removing the temporary binding tape; and heating and curing the non-woven belt binding band interface. The invention can temporarily bind the core column, and can divide the core column of the large-scale transformer into a plurality of parts, thereby facilitating the transportation of the core column, solving the problems of difficult transportation and high cost of the large-scale transformer and being beneficial to the electric power construction of remote areas. The semicircle stem adopts the fixed frock of plastic to carry out interim ligature fixed, has solved the aversion problem that the atress is uneven when upper portion iron core piece tightens up owing to interim bandage, has guaranteed the pile up size of iron core stem.
Description
Technical Field
The invention relates to a split iron core binding process method for a large converter transformer.
Background
With the development of direct current transmission in China, in order to meet the requirement of installing large-scale converter transformers in remote areas with poor transportation conditions, the iron core is designed into a split type, and can be split into a plurality of U-shaped frames which are respectively arranged in transportation tanks for transportation. And the stem of U type iron core frame is semi-circular, easily causes the displacement of upper portion iron core piece because the atress is uneven when the ligature, can't guarantee sizes such as iron core diameter, post interval, leads to the coil suit difficulty.
Disclosure of Invention
In order to solve the problems, the invention provides a binding process method of a split type iron core semicircular core column, which uses a binding band for temporary binding before an iron core is erected, thereby effectively ensuring the size and the mechanical strength of the iron core, meeting the requirements of disassembly and long-distance transportation, ensuring no deformation after field assembly, and meeting the requirement of quality.
The technical scheme of the invention comprises the following steps in sequence:
(1) Transversely placing a U-shaped iron core comprising a side column and a semicircular core column;
(2) Shaping the iron core sheet of the semicircular core column, and fixing by using a shaping mechanism;
(3) Fixing the semicircular core column through a fixing tool, and installing the fixing tool and the shaping mechanism in a staggered manner along the length direction of the semicircular core column;
(4) Temporarily binding the semicircular core column and the side column of the U-shaped core column by using a temporary binding band;
(5) Erecting the U-shaped iron core, removing the shaping mechanism on the semicircular core column, binding the U-shaped iron core by a weftless tape, and removing a temporary binding belt in front of the binding direction along with the binding;
(6) The broken position of the weftless tape bandage extends to the outer side of the core column, and the interface is heated and cured.
Specifically, each shaping mechanism comprises a clamping channel steel, trapezoidal wood is arranged at the upper part and the lower part of the clamping channel steel, and the trapezoidal surface of the trapezoidal wood is matched with the lower cambered surface of the semicircular core column; the upper end and the lower end of the clamping channel steel are connected through a screw rod.
Furthermore, 4 to 8 groups of clamping channel steel and screw rod groups are arranged, and when the clamping device is installed, the two outer groups are installed in advance, and then the middle groups are installed.
Preferably, the fastening torque of the screw is 80-120N.m.
Specifically, fixed frock includes following structure: the semicircular base plate is arranged on one side of the plane of the semicircular core column, an L-shaped right-angle plate is arranged between the semicircular base plate and the semicircular core column, one edge of the L-shaped right-angle plate is positioned above the semicircular core column, and a first base plate is arranged above the edge of the L-shaped right-angle plate; the upper part of the arc-shaped surface of the semicircular core column is provided with a semicircular base plate, a second base plate is arranged below the semicircular base plate, and the binding band is wound on the peripheries of the semicircular base plate, the first base plate, the semicircular base plate and the second base plate.
Furthermore, a protective layer is arranged between the L-shaped right-angle plate and one side of the plane of the semicircular core column.
Preferably, the temporary lashing moment is 30-40N.m.
Preferably, after the U-shaped iron core frame is temporarily bound, the iron yoke is clamped, and all structural part connecting bolts are fastened.
Preferably, after the banding is finished, before the U-shaped iron core is erected, the resistance between the U-shaped iron core and the clamping piece is measured to confirm that the insulation requirement is met between the U-shaped iron core and the clamping piece.
Preferably, after the U-shaped iron core is erected, binding the weftless tape by using a vertical binding machine; and sequentially detaching the fixing tool and the shaping mechanism one by one from the lower part during binding.
The invention can temporarily bind the core column, and can divide the core column of the large-scale transformer into a plurality of parts, thereby facilitating the transportation of the core column, solving the problems of difficult transportation and high cost of the large-scale transformer and being beneficial to the electric power construction of remote areas. The semicircle stem adopts the fixed frock of plastic to carry out interim ligature fixed, has solved the aversion problem that the atress is uneven when upper portion iron core piece tightens up owing to interim bandage, has guaranteed the pile up size of iron core stem.
Drawings
Fig. 1 is a front view of a U-shaped stem of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a state diagram of the setting mechanism;
FIG. 4 is a schematic diagram of temporary binding of a semicircular core column;
FIG. 5 is an enlarged view of point A in FIG. 4;
FIG. 6 is an enlarged view of point B in FIG. 4;
fig. 7 is a schematic diagram of a top view of the using state of the embodiment in a temporary binding state of the semicircular core column.
The clamping device comprises a side column 1, a side column 2, an upper clamping piece 3, a semicircular core column 4, a lower clamping piece 5, clamping channel steel 6, a semicircular core column 7, a screw rod 8, trapezoidal wood 9, clamping channel steel 10, trapezoidal wood 11, a screw rod 12, a first base plate 13, an L-shaped right-angle plate 14, a semicircular base plate 15, a cushion block 16, a binding band 17, a second base plate 18, a trapezoidal wood base plate 19, an upper yoke 20 and a lower yoke.
Detailed Description
The present example was carried out as follows:
1. firstly, the integral iron core is divided into two parts, and each part forms a U-shaped iron core by a side column 1 and a semicircular column 6. The U-shaped core is placed horizontally with the upper and lower yokes 19 and 20 at each end and connected by the upper and lower clamps 2 and 4.
2. The iron core sheet is shaped, and the semicircular core column 6 of each part is clamped and fastened through a shaping mechanism and is positioned:
4-8 shaping mechanisms are generally used for each semicircular core column, the number of the shaping mechanisms is determined according to the decomposed length of the semicircular core column, and 6 shaping mechanisms are used in the figure. When the device is installed, the shaping mechanisms on the two sides are installed firstly, and then the shaping mechanism in the middle is installed. Each set of shaping mechanism comprises two clamping channel steels 5 and 9, two screw rods 7 and 11 and trapezoidal wood 8 and 10. Trapezoidal wood 8 and 10 have been placed between the arcwall face of the tight channel-section steel 9 of clamp and semicircle stem 6 of one side, and the trapezoidal face of two trapezoidal wood 8, 10 cooperates with the cambered surface of the upper portion and the lower part of semicircle stem 6 respectively, and the clearance is filled with the cardboard between two trapezoidal wood 8, 10 and the semicircle stem 6. The upper and lower ends of the clamping channel steels 5 and 9 are respectively connected through screws 7 and 11 so as to adjust the clamping degree of the clamping channel steels 5 and 9 on the semicircular iron core 6, and generally, the fastening force of the screws is 80-120n.m, such as 100n.m.
3. Fixing the semicircular core column by using a fixing tool:
a plurality of fixing tools are arranged at intervals for each semicircular core column 6, the interval between every two adjacent fixing tools is generally 180-220mm, and 8-15 fixing tools are arranged according to the length of each semicircular core column 6. The fixing tool and the setting mechanism are installed along the length direction of the semicircular core column 6 in a staggered mode, and only the setting mechanism or only the fixing tool is installed at a certain position.
Each fixing tool comprises an L-shaped rectangular plate 13, a semicircular backing plate 14, a trapezoidal wood backing plate 18, a first backing plate 12 and a second backing plate 17.
During the use, set up the riser of L shape right-angle board 13 in the plane one side of semicircle stem 6, be equipped with the cardboard between the two and protect in order to realize protecting semicircle stem 6 as the inoxidizing coating. And a semicircular cushion plate 14 is arranged on the outer side of the vertical plate of the L-shaped right-angle plate 13 and forms a circle with the semicircular core column 6. The semicircular backing plate 14 must be positioned to avoid the position of the setting mechanism. The transverse plate of the L-shaped right-angle plate 13 is positioned above the semicircular core column 6, a pulling plate and a pulling plate insulating piece are arranged between the transverse plate and the upper surface of the semicircular core column 6, and a first base plate 12 is arranged above the transverse plate. The second shim plate 17 is mounted at the widest part of the semicircular stem 6, and the outer surface of the lower part of the second shim plate is an inclined surface so as to smoothly transit to the outer surface of the lower part of the semicircular stem 6. The trapezoidal wood base plate 18 is positioned between the first base plate 12 and the second base plate 17, the trapezoidal surface of the trapezoidal wood base plate is matched with the outer surface of the upper part of the semicircular core column 6, and a gap between the trapezoidal wood base plate 18 and the semicircular core 6 is tightly plugged by a paperboard strip. After the tool is installed, the semicircular core column 6 and the semicircular base plate 14 form a circle. The lower bottom of the semicircular core column 6 is also provided with a cushion block 15. The L-shaped right-angle plate 13, the first cushion plate 12, the second cushion plate 17, the trapezoidal wood cushion plate 18 and the cushion block 15 form protection for the semicircular core column 6 together
4. And temporarily binding the fixed semicircular core column 6 and the fixed tool by using a binding band 16, and temporarily binding the side column 1, namely temporarily binding the side column 1 and the semicircular core column 6 of the whole U-shaped iron core respectively, wherein the binding moment is 30-40N.m.
5. After binding is finished, the insulation resistance of the U-shaped iron core to the upper clamping piece 2 and the lower clamping piece 4 is measured by a 2500V megger, and the insulation between stages is measured by a 500 megger, so that the resistance value is required to be more than or equal to 0.5M omega.
6. After the U-shaped iron core frame is bound temporarily, the iron yoke is clamped, and connecting bolts of all structural parts are fastened.
7. The U-shaped iron core is erected by using the overturning platform and is hung to the leveled ground.
8. And (3) removing the shaping mechanism, binding the weftless tape by using a vertical binding machine, and sequentially removing the temporary binding tape and the fixing tool from the lower part during binding. In the process, the shaping mechanism can be removed firstly after the fixed U-shaped iron core is erected, and then the temporary binding band is gradually removed in the binding process. The following may also be possible: and (4) binding the core column weftless tape by using a vertical binding machine. And during binding, the fixing tool and the shaping mechanism are sequentially removed one by one from the lower part. Because the core column 6 is semicircular, the contact ratio of the core column and the center of the binding disc is more than or equal to 50mm. Demolish the fixed frock of the first semicircle in stem lower part and decide the shape mechanism before the ligature, with 9 layers of weftless tapes of every department ligature of vertical binding machine, first layer weftless tape need with less tightening force, guarantee not during the ligature fall can, begin to carry out the ligature for 5MPa according to the ligature power from the second floor. According to the method, all the core column non-woven belts are finished, the cutting positions of the non-woven belts are required to be positioned at the outer sides of the core columns, the non-woven belt interfaces are heated and cured by a hot air gun, and the colors of the non-woven belts are changed into yellowish.
Claims (9)
1. A large-scale converter transformer disassembly type iron core binding process method is characterized in that: the method comprises the following steps in sequence:
(1) Transversely placing a U-shaped iron core comprising a side column and a semicircular core column;
(2) Shaping the iron core sheet of the semicircular core column, and fixing by using a shaping mechanism;
(3) Fixing the semicircular core column through a fixing tool, and installing the fixing tool and the shaping mechanism in a staggered manner along the length direction of the semicircular core column;
(4) Temporarily binding the semicircular core column and the side column of the U-shaped core column by using a temporary binding band;
(5) Erecting the U-shaped iron core, removing the shaping mechanism on the semicircular core column, binding the U-shaped iron core by a weftless tape, and removing a temporary binding belt in front of the binding direction along with the binding;
(6) The broken position of the weftless tape binding tape extends to the outer side of the core column, and the interface is heated and cured;
wherein, fixed frock includes following structure: the semicircular base plate is arranged on one side of the plane of the semicircular core column, an L-shaped right-angle plate is arranged between the semicircular base plate and the semicircular core column, one edge of the L-shaped right-angle plate is positioned above the semicircular core column, and a first base plate is arranged above the edge of the L-shaped right-angle plate; the upper part of the arc-shaped surface of the semicircular core column is provided with a semicircular base plate, a second base plate is arranged below the semicircular base plate, and the binding band is wound on the peripheries of the semicircular base plate, the first base plate, the semicircular base plate and the second base plate.
2. The large-scale converter transformer disassembled core binding process method according to claim 1, which is characterized in that: each shaping mechanism comprises a clamping channel steel, trapezoidal wood is arranged at the upper part and the lower part of the clamping channel steel, and the trapezoidal surface of the trapezoidal wood is matched with the lower cambered surface of the semicircular core column; the upper end and the lower end of the clamping channel steel are connected through a screw rod.
3. The large-scale converter transformer split type iron core binding process method according to claim 2, which is characterized in that: there are 4 to 8 groups of clamping channel steel and screw rod groups, when mounting, firstly two groups at the outer side are mounted, and then each group at the middle part is mounted.
4. The large-scale converter transformer disassembled core binding process method according to claim 2 or 3, which is characterized in that: the fastening torque of the screw is 80-120N.m.
5. The large-scale converter transformer disassembled core binding process method according to claim 1, 2 or 3, which is characterized in that: a protective layer is arranged between the L-shaped right-angle plate and one side of the plane of the semicircular core column.
6. The large-scale converter transformer disassembled core binding process method according to claim 1, 2 or 3, which is characterized in that: the temporary binding moment is 30-40N.m.
7. The large-scale converter transformer disassembled core binding process method according to claim 1, 2 or 3, which is characterized in that: after the U-shaped iron core frame is bound temporarily, the iron yoke is clamped, and connecting bolts of all structural parts are fastened.
8. The large-scale converter transformer split type iron core binding process method according to claim 7, which is characterized in that: after the binding is finished, before the U-shaped iron core is erected, the resistance between the U-shaped iron core and the clamping piece is measured to determine that the U-shaped iron core and the clamping piece meet the insulation requirement.
9. The large-scale converter transformer disassembled core binding process method according to claim 1, 2 or 3, which is characterized in that: after the U-shaped iron core is erected, binding the weftless tape by using a vertical binding machine; and during binding, the fixing tool and the shaping mechanism are sequentially removed one by one from the lower part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910726031.8A CN112349495B (en) | 2019-08-07 | 2019-08-07 | Split type iron core binding process method for large converter transformer |
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| CN201910726031.8A CN112349495B (en) | 2019-08-07 | 2019-08-07 | Split type iron core binding process method for large converter transformer |
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| CN112349495A CN112349495A (en) | 2021-02-09 |
| CN112349495B true CN112349495B (en) | 2023-02-21 |
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| CN115376814A (en) * | 2022-10-24 | 2022-11-22 | 通变电器有限公司 | Transformer iron core production process |
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