Stepped coil wire arrangement method

Abstract

The present invention provides a stepped coil wire arrangement method. To solve the technical problem, the technical solution of the present invention is: a stepped coil wire arrangement method, comprising the following steps: on the basis of the degree of leakage flux curving at ends of a coil and longitudinal capacitance requirements of the coil, determining the number of inner shield continuous wire sections of upper and lower end portions of the coil and wire gauges of transposed wires used, wherein in the region, the number of wire pancakes on the upper end portion and the number of wire pancakes on the lower end portion respectively account for 5-6% of the total number of wire disks; arranging sandwich-interleaved continuous wire pancakes, wherein in the region, the wire pancakes account for 6-8%; and arranging common interleaved wire pancakes, wherein the region, the wire pancakes account for 12-15%; and winding the remaining wire pancakes in the entire coil by means of continuous wire sections. By changing a winding method and the wire gauges of the coil in the height direction of the coil, the rationality of the longitudinal capacitance distribution can be ingeniously achieved, the oscillation amplitude of the coil under the action of a lightning impulse voltage is reduced, an initial potential distribution is closer to a final potential distribution, and the lightning impulse resistance capability of the coil is improved.

Description

A step-type coil conductor arrangement method Technical Field

[0001] The present invention relates to the technical field of reactor coil improvement, and in particular to a step-type coil conductor arrangement method. Background Art

[0002] In recent years, with the rapid development of my country's power system, long-distance, high-capacity transmission networks have become increasingly large. When the power system is operating under light load, the line capacity rises, affecting the power supply quality of the grid. To this end, reactors of a certain capacity must be connected in parallel in the power system.

[0003] Shunt reactors are subject to lightning overvoltage, switching overvoltage, and power frequency overvoltage during operation in power systems. To ensure that high-voltage, extra-high-voltage, and even ultra-high-voltage reactors have sufficient insulation margin and reliability while offering high cost-effectiveness, improved reactor coil design is required.

[0004] Summary of the Invention

[0005] The present invention aims to provide a step-type coil conductor arrangement method to overcome the deficiencies in the prior art.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a step-by-step coil conductor arrangement method, comprising the following steps:

[0007] Determine the number of continuous wire segments at the upper and lower ends of the coil and the gauge of the transposed wire used based on the bending degree of the leakage flux at the coil ends and the longitudinal capacitance requirements of the coil;

[0008] The number of regional coils, the upper and lower ends each account for 5-6% of the total number of coils; the coils in the area are 6-8% for the interlaced tangled continuous coils; the coils in the area are 12-15% for the ordinary tangled coils; the remaining coils in the entire coil are wound with continuous wire segments.

[0009] As an improvement to the stepped coil conductor arrangement method of the present invention, the order of series connection of the components of the coil from top to bottom is: electrostatic ring - inner shielding continuous line segment - flower-inserted tangled coil - ordinary tangled coil - continuous line segment - inner shielding continuous line segment.

[0010] As an improvement to the stepped coil conductor arrangement method of the present invention, the conductor forms used include inner-screen continuous wire segments wound with transposed wires and shielded wires, inserted tangled and ordinary tangled wire coils wound with combined wires, and continuous wire coil areas wound with transposed wires.

[0011] As an improvement to the stepped coil conductor arrangement method of the present invention, the neutron conductor gauge of the transposed conductor used at the coil end has a radial thickness thicker than that of a conventional wire segment, a width narrower than that of a normal wire segment, and a corner arc ≥0.8 mm to reduce the coil end.

[0012] As an improvement of the stepped coil conductor arrangement method of the present invention, the sub-conductor wire gauge radial thickness a is 1.2 times the thickness of a regular wire segment, and its width b is 0.8 times the width of a normal wire segment.

[0013] Compared with the prior art, the beneficial effects of the present invention are: by changing the winding method and wire gauge of the coil along the height direction of the coil, the rationality of the longitudinal capacitance distribution can be cleverly achieved, the oscillation amplitude of the coil under the action of lightning impulse voltage is reduced, the initial potential distribution is closer to the final potential distribution, and the ability of the coil to resist lightning impulse is improved. After the patented technology of the present invention is implemented on the transformer coil, it better solves the problem of uneven distribution of high-frequency lightning impulse wave voltage along the coil and improves the longitudinal insulation strength of the coil. The patented technology of the present invention has a reasonable structure, flexible design, high cost performance, can effectively solve the limitations of traditional design solutions, and further improves the longitudinal insulation strength of the reactor. This structure is suitable for reactor products with voltage levels of 750kV and above. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 is a diagram of the coil structure of the present invention;

[0016] Figure 2 is a schematic diagram of a combined conductor;

[0017] Figure 3 is a schematic diagram of a transposed conductor;

[0018] Figure 4 is a schematic diagram of a sub-conductor conductor for a combined or transposed conductor.

[0019] Among them, 1. Combined conductor; 2. Transposed conductor; 3. Shielded conductor; 4. Electrostatic ring; 5. Interlaced tangled segment; 6. Ordinary tangled segment; 7. Internally shielded continuous segment; 8. Continuous segment. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] As shown in Figures 1 to 3, a step-type coil conductor arrangement method includes the following steps:

[0022] Determine the number of continuous wire segments at the upper and lower ends of the coil and the gauge of the transposed conductor 2 used based on the bending degree of the leakage flux at the coil ends and the longitudinal capacitance requirements of the coil;

[0023] The number of regional coils, the upper and lower ends each account for 5-6% of the total number of coils; the 5 continuous coils with interlaced tangled sections, the coils in this area account for 6-8%; there are 6 ordinary tangled sections with coils, the coils in this area account for 12-15%; the remaining coils in the entire coil are wound with 8 continuous coils.

[0024] The order of series connection of the components of the coil from top to bottom is: electrostatic ring 4 - inner shielding continuous line segment 7 - flower-inserted tangled segment 5 type coil - ordinary tangled segment 6 type coil - continuous line segment 8 - inner shielding continuous line segment 7.

[0025] The conductor types used include inner screen continuous wire segment 8 wound with transposed wire 2 and shielded wire 3, flower-inserted tangled segment 5 type and ordinary tangled segment 6 type wire coils wound with combined wire 1, and continuous wire coil area wound with transposed wire 2.

[0026] The gauge of the sub-conductor wire of the transposed conductor 2 used at the coil end is thicker than that of the conventional wire segment, narrower than that of the normal wire segment, and the corner arc is ≥0.8mm to reduce the coil end.

[0027] The radial thickness a of the sub-conductor wire gauge is 1.2 times the thickness of the normal wire segment, and its width b is 0.8 times the width of the normal wire segment.

[0028] First, the number of continuous wire segments within the upper and lower ends of the coil and the wire gauge of the transposed conductor (2) used are determined based on the degree of curvature of the coil end leakage flux and the required longitudinal capacitance. This not only reduces the temperature rise at the coil end hotspot by 2-3K, but also increases the longitudinal capacitance by inserting the shielded conductor (3). The upper and lower ends each account for 5-6% of the total number of coils. Next is the continuous coil with five interlaced tangled segments, accounting for 6-8% of the coils in this area. This winding method improves the coil's longitudinal capacitance and the coil's fill rate. Next is the standard tangled segment (6) coil, accounting for 12-15% of the coils in this area. Finally, the remaining coils in the entire coil are wound with eight continuous wire segments.

[0029] The series connection order of the reactor coil components, from top to bottom, is as follows: electrostatic ring 4 - inner shield continuous wire segment 7 - interlaced tangled segment 5 coil - standard tangled segment 6 coil - continuous wire segment 8 - inner shield continuous wire segment 7. The conductors used are: inner shield continuous wire segment 8 is wound with transposed conductor 2 and shielding conductor 3; interlaced tangled segment 5 and standard tangled coils are wound with combined conductor 1; and the continuous coil area is wound with transposed conductor 2. The gauge of the sub-conductor in the transposed conductor 2 used at the coil ends is approximately 1.2 times the radial thickness a of a normal wire segment, and approximately 0.8 times the width b. The corner radius r is ≥0.8mm. This reduces electric field concentration at the coil ends, particularly at the first coil, further increasing the insulation margin there.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A step-type coil conductor arrangement method, characterized in that: The following steps are included: Determine the number of inner screen continuous wire segments at the upper and lower ends of the coil and the wire gauge of the transposed conductor used according to the bending degree of the leakage flux at the coil end and the longitudinal capacitance requirement of the coil; The number of regional wire coils, the upper and lower ends each account for 5-6% of the total number of wire coils; the wire coils in the area account for 6-8% of the total number of wire coils; ordinary tangled wire coils are arranged, and the wire coils in the area account for 12-15% of the total number of wire coils; the remaining wire coils in the entire coil are wound with continuous wire segments.

2. A step-type coil conductor arrangement method according to claim 1, characterized in that: The order of serial connection of the components of the coil from top to bottom is: electrostatic ring - inner shielding continuous line segment - flower-inserted tangled coil - ordinary tangled coil - continuous line segment - inner shielding continuous line segment.

3. A step-type coil conductor arrangement method according to claim 2, characterized in that: The conductor types used include inner-screen continuous line segments wound with transposed conductors and shielded conductors, inserted tangled and ordinary tangled wire coils wound with combined conductors, and continuous wire coil areas wound with transposed conductors.

4. The step-type coil conductor arrangement method according to claim 1, characterized in that: The gauge of the sub-conductor wire of the transposed conductor used at the coil end is thicker than the thickness of the conventional wire segment, narrower than the width of the normal wire segment, and the corner arc is ≥0.8mm to lower the coil end.

5. The step-type coil conductor arrangement method according to claim 1, characterized in that: The radial thickness a of the sub-conductor wire gauge is 1.2 times the thickness of the normal wire segment, and its width b is 0.8 times the width of the normal wire segment.

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