A method for winding an extra-high voltage transformer and reactor coil

Abstract

The present application belongs to the technical field of manufacturing extra-high voltage transformer and electric reactor, and relates to a winding method of extra-high voltage transformer and electric reactor coil, a coil winding tool is designed, the coil winding tool comprises oil gap support positioning block, positioning paper tube and positioning paper ring, positioning sliding grooves are arranged in the middle position of the length direction of the oil gap support positioning block, and a plurality of oil gap support positioning blocks are fixedly arranged on the outer periphery of the positioning paper tube; the use of the coil winding tool comprises the following steps: placing the positioning paper tube on the upper surface of the positioning paper ring, and the inner diameter sides of the positioning paper tube and the positioning paper ring are basically flush; inserting the oil gap support into the positioning sliding groove on the oil gap support positioning block, and inserting the lowermost coil cushion block into the oil gap support; starting to wind the coil, and placing the coil cushion block of the previous layer according to the process requirement of the coil, and completing the winding of the extra-high voltage transformer and electric reactor coil. The tooling of the present application has high mechanical strength and can be repeatedly used, and the winding method is simple and easy to operate.

Description

Technical Field

[0001] This invention belongs to the field of ultra-high voltage transformer and reactor manufacturing technology, specifically relating to a winding method for ultra-high voltage transformer and reactor coils. Background Technology

[0002] In oil-immersed power transformers and reactors, the oil gap supports inside the coil serve to support the coil, form oil channels within the coil, and fix the coil pads. The oil gap supports divide the coil radially into equal sections, ensuring uniform stress distribution when the coil is subjected to short-circuit forces. Simultaneously, the oil gap supports are used to position the coil leads and facilitate conductor transposition. Therefore, the assembly and fixation of the oil gap supports are crucial during coil winding.

[0003] Currently, the conventional method is to directly glue the transformer coil oil gap support bars to the coil paper tube according to the equal division requirements of the drawings, and then assemble the coil spacers onto the oil gap support bars using a matching dovetail groove structure. However, due to the smaller design dimensions of the oil gap support bars in ultra-high voltage transformers and reactors, specially designed process paper tubes are required for fixing the oil gap support bars. However, directly gluing the oil gap support bars to the process paper tubes does not provide a secure fixation. Furthermore, excessive adhesive on the surface of the oil gap support bars can negatively impact the electrical performance of the coil products. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for winding coils of ultra-high voltage transformers and reactors. The technical solution adopted by this invention is as follows:

[0005] A method for winding coils of ultra-high voltage transformers and reactors is disclosed. The method includes a coil winding fixture comprising an oil gap support positioning block, a positioning paper tube, and a positioning paper ring. The oil gap support positioning block is a rectangular block structure with a positioning groove formed at the midpoint of its length. The shape and size of the positioning groove are adapted to the end of the oil gap support away from the coil pad. According to the number of oil gap supports specified in the process requirements, several oil gap support positioning blocks are uniformly fixed in the vertical direction on the outer periphery of the positioning paper tube by adhesive bonding. The width between the inner and outer diameters of the positioning paper ring is greater than the distance from the inner diameter side of the positioning paper tube to the outer surface of the oil gap support after the oil gap support is inserted into the positioning groove.

[0006] The winding of a coil includes the following steps:

[0007] Lay the positioning paper ring flat on the workbench, and place the positioning paper tube on the upper surface of the positioning paper ring, with the inner diameter sides of the positioning paper tube and the positioning paper ring flush.

[0008] Insert the oil gap support strip into the positioning groove on the oil gap support strip positioning block, and place the oil gap support strip into place by the oil gap support strip positioning block that is bonded to the outer periphery of the positioning paper tube;

[0009] Insert the bottom coil pad into the oil gap support bar. The coil pad and the oil gap support bar are machined with dovetail groove structures that fit together. The dovetail groove structures fix the coil pad and the oil gap support bar into one piece.

[0010] Begin winding the coil, and according to the coil's process requirements, place the coil pads layer by layer to complete the winding of the UHV transformer and reactor coils;

[0011] Finally, remove the oil gap support bar positioning block and positioning paper tube from the completed coil, take away the coil and start winding the next coil, or put away the positioning paper ring and reuse the coil winding fixture next time.

[0012] Preferably, the oil gap support positioning block is made of phenolic fabric board.

[0013] The beneficial effects of this invention are:

[0014] This invention utilizes a special groove structure for assembling the oil gap support bar fixing strip. The oil gap support bar positioning block, positioning paper tube, and positioning paper ring are simple to manufacture, effectively improving work efficiency, avoiding residual adhesive on the surface of the oil gap support bar, and ensuring coil product quality. This fixture uses phenolic fabric board, which has high mechanical strength, is reusable, and is economical and practical; the winding method is simple and easy to operate. Attached Figure Description

[0015] Figure 1 This is a top view of the coil oil gap support bar assembly fixture according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the oil gap support positioning block according to an embodiment of the present invention;

[0017] Figure 3 This is a front view of the coil oil gap support bar assembly tooling in use according to an embodiment of the present invention;

[0018] Figure 4 This is a top view of the coil oil gap support bar assembly tooling in use according to an embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram illustrating the dimensions of the oil gap support positioning block according to an embodiment of the present invention.

[0020] In the diagram, 1 is the positioning block of the oil gap support bar, 2 is the positioning paper tube, 3 is the positioning slide groove, 4 is the positioning paper ring, 5 is the coil pad, and 6 is the oil gap support bar. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] refer to Figure 1-3 A method for winding coils of ultra-high voltage transformers and reactors is disclosed. The method includes a coil winding fixture comprising: an oil gap support positioning block 1, a positioning paper tube 2, and a positioning paper ring 4. The oil gap support positioning block 1 is a rectangular block structure with a positioning groove 3 formed at the midpoint of its length. The shape and size of the positioning groove 3 are adapted to the end of the oil gap support 6 furthest from the coil pad 5. Several oil gap support positioning blocks 1 are evenly fixed to the outer periphery of the positioning paper tube 2 by adhesive bonding, depending on the required number of oil gap support bars 6. The width between the inner and outer diameters of the positioning paper ring 4 is slightly larger than the distance from the inner diameter side of the positioning paper tube 2 to the outer surface of the oil gap support 6 after the oil gap support bar 6 is inserted into the positioning groove 3. Figure 1 The positioning groove 3 machined on the oil gap support positioning block 1 is not shown in the figure.

[0023] The oil gap support positioning block 1 is made of phenolic cloth board, which has high mechanical strength, can be reused, and is economical and practical.

[0024] refer to Figure 3-4 The present invention discloses a method for winding coils of an ultra-high voltage transformer and a reactor, and the steps for using the coil winding fixture are as follows:

[0025] First, lay the positioning paper ring 4 flat on the workbench. Place the positioning paper tube 2 on the upper surface of the positioning paper ring 4, with the inner diameter sides of the positioning paper tube 2 and the positioning paper ring 4 basically flush. Insert the oil gap support strip 6 into the positioning groove 3 on the oil gap support strip positioning block 1. The lower positioning paper ring 4 provides support for the lower end of the oil gap support strip 6. By attaching the oil gap support strip positioning block 1 to the outer circumference of the positioning paper tube 2, the oil gap support strip 6 is placed in position according to the equal division requirements of the drawing. The oil gap support strip positioning block 1 and the positioning paper tube 2 achieve precise positioning of the circumferentially placed oil gap support strip 6.

[0026] Then, the bottom coil pad 5 is inserted into the oil gap support 6. The coil pad 5 and the oil gap support 6 are machined with dovetail groove structures that fit together. The dovetail groove structures fix the coil pad 5 and the oil gap support 6 into one piece.

[0027] Finally, the coil winding begins, and according to the coil's process requirements, the coil pads 5 are placed layer by layer. During the coil winding process, the oil gap support positioning block 1 and the coil winding tension force fix the oil gap support 6, thereby fixing and positioning the coil pads 5, completing the winding of the UHV transformer and reactor coils. Finally, the oil gap support positioning block 1 and the positioning paper tube 2 are removed from the wound coil, and the positioning paper tube 4 is picked up after removing the coil. The coil winding fixture can be reused next time.

[0028] In the background section, existing coil winding processes involve the addition of a process paper tube to secure the oil gap support. This invention eliminates the need for the process paper tube and does not use adhesive, resulting in coil products assembled using this fixture exhibiting superior electrical performance.

[0029] refer to Figure 5 Based on the structure and dimensions of the oil gap support strip 6, an oil gap support strip fixing strip 1 is fabricated. The width of the oil gap support strip fixing strip 1 is greater than that of the oil gap support strip 6. A positioning groove 3 is formed along the length of the oil gap support strip fixing strip 1. The shape and dimensions of the positioning groove 3 match those of the oil gap support strip 6. The thickness of the oil gap support strip fixing strip 1 is S. The dimensions of the positioning groove 3 are as follows: the groove opening shape is consistent with the narrow side of the oil gap support strip 6; the groove width L is equal to the narrow side width of the oil gap support strip 6 minus the allowance; the groove opening angle α is consistent with the chamfer angle of the oil gap support strip 6; the groove depth D is equal to the thickness of the oil gap support strip 6 minus the size of the coil pad 5 assembly groove minus the allowance; where the allowance is 1mm.

[0030] In the embodiments of the present invention, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0031] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A method for winding coils of an ultra-high voltage transformer and reactor, characterized in that, Design a coil winding fixture, which includes an oil gap support bar positioning block, a positioning paper tube, and a positioning paper ring. The oil gap support bar positioning block is a rectangular block structure. A positioning groove is opened at the middle position of the oil gap support bar positioning block along its length. The shape and size of the positioning groove are adapted to the end of the oil gap support bar away from the coil pad block. According to the number of oil gap support strips specified in the process requirements, several oil gap support strip positioning blocks are uniformly fixed in the vertical direction on the outer periphery of the positioning paper tube by adhesive bonding; the width between the inner and outer diameters of the positioning paper ring is greater than the distance from the inner diameter side of the positioning paper tube to the outer surface of the oil gap support strip after the oil gap support strip is inserted into the positioning groove. The winding of a coil includes the following steps: Lay the positioning paper ring flat on the workbench, and place the positioning paper tube on the upper surface of the positioning paper ring, with the inner diameter sides of the positioning paper tube and the positioning paper ring flush. Insert the oil gap support strip into the positioning groove on the oil gap support strip positioning block, and place the oil gap support strip into place by the oil gap support strip positioning block that is bonded to the outer periphery of the positioning paper tube; Insert the bottom coil pad into the oil gap support bar. The coil pad and the oil gap support bar are machined with dovetail groove structures that fit together. The dovetail groove structures fix the coil pad and the oil gap support bar into one piece. Begin winding the coil, and according to the coil's process requirements, place the coil pads layer by layer to complete the winding of the UHV transformer and reactor coils; Finally, remove the oil gap support bar positioning block and positioning paper tube from the completed coil, take away the coil and start winding the next coil, or put away the positioning paper ring and reuse the coil winding fixture next time.

2. The method for winding the coils of an ultra-high voltage transformer and reactor according to claim 1, characterized in that, The oil gap support positioning block is made of phenolic fabric board.

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