Internal and external stay structure of voltage regulating coil

Abstract

The utility model belongs to the field of transformers, and relates to a voltage regulating coil internal and external supporting strip structure, an internal supporting strip is bound on one side, close to a central shaft, of a voltage regulating coil through a paper tape, and a first external supporting strip, a second external supporting strip and a third external supporting strip are provided with rectangular binding grooves. The first external supporting strip, the second external supporting strip and the third external supporting strip are arranged on the side, away from the center shaft, of the voltage regulating coil in a three-section staggered lap joint mode from top to bottom, the lower portion of the first external supporting strip and the upper portion of the second external supporting strip are bound through PET belts, the upper portion of the third external supporting strip and the lower portion of the second external supporting strip are bound through PET belts, and the upper portion of the first external supporting strip and the lower portion of the third external supporting strip are bound through paper belts. One side of each adjusting filler strip is provided with a sawtooth-shaped notch, the adjusting filler strips are arranged on the two sides of a coil outlet head of the voltage adjusting coil, and the sawtooth-shaped notches of the adjusting filler strips face the outer side of the coil. According to the utility model, the repeated work with huge workload, such as leveling by a cushion block and hanging by a supporting strip, in the winding process of the voltage regulating coil is reduced, and the hidden danger of poor anti-vibration performance of the voltage regulating coil is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer manufacturing, and relates to an internal and external brace structure of a voltage regulating coil for a converter transformer. Background Art

[0002] In the power transmission and distribution system, the converter transformer plays a vital role, especially in the high-voltage direct current transmission (HVDC) system, where the converter transformer must not only withstand the impact of high voltage and high current, but also operate stably under complex electromagnetic environment and variable temperature conditions. Therefore, the design and manufacturing quality of the internal structure of the converter transformer, especially the voltage regulating coil part of the converter transformer, are crucial to ensure the stability and reliability of the entire system.

[0003] The voltage regulating coil is a key component in the converter transformer, and the performance of the voltage regulating coil directly affects the voltage regulation range and accuracy of the converter transformer. In the traditional converter transformer design, the external support bar structure of the voltage regulating coil often adopts the method of pads hanging support bars. A large number of pads and support bars need to be placed in the process of winding the voltage regulating coil, and there are huge repetitive tasks such as pad leveling and support bar hanging. The traditional external support bar and hanging structure cannot stagger the coil head position of the voltage regulating coil, and the paper tape binding is easy to reduce the shrinkage rate when the voltage regulating coil is dried and pressed, causing the paper tape to fall off, and there is a hidden danger of insufficient vibration resistance. The mechanical strength may not be enough to cope with long-term vibration and impact, resulting in deformation or damage of the voltage regulating coil during the operation of the converter transformer, further affecting the performance and life of the voltage regulating coil.

[0004] Therefore, in order to improve the overall performance and service life of the converter transformer, it is necessary to improve and innovate the internal and external support bars and binding structure of the voltage regulating coil, which involves many aspects such as the optimization of the support bar structure and the improvement of the binding method. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes an internal and external brace structure for a voltage regulating coil of a converter transformer, which realizes the reliable mechanical performance of the voltage regulating coil. The technical solution adopted by the utility model is:

[0006] The internal and external strut structure of the voltage regulating coil comprises an adjusting pad, an internal pad, an external pad one, an external pad two and an external pad three; the internal pad is tied with paper tape on the side of the voltage regulating coil close to the central axis, a plurality of rectangular binding grooves are provided in the width direction of the external pad one, the external pad two and the external pad three, the external pad one, the external pad two and the external pad three are arranged in three sections from top to bottom in an alternating overlap manner on the side of the voltage regulating coil away from the central axis, the lower part of the external pad and the upper part of the external pad two, the upper part of the external pad three and the lower part of the external pad two are tied with PET tape, the upper part of the external pad one and the lower part of the external pad three are tied with paper tape; the adjusting pad is made of insulating cardboard, a plurality of serrated notches are provided on one side of the adjusting pad, the adjusting pad is arranged on both sides of the coil protruding from the voltage regulating coil, and the serrated notches of the adjusting pad face the outside of the coil.

[0007] Preferably, the width of the adjusting pad is the width of the voltage regulating coil, and the length of the adjusting pad is 1 / 3 or 1 / 4 of the inner circumference of the coil.

[0008] Preferably, the sawtooth width of the sawtooth-shaped notch of the adjusting pad strip is 3-5 mm, and the sawtooth length is 1 / 3-2 / 3 of the width of the adjusting pad strip.

[0009] Preferably, a breaking groove and a corner ring placement opening are provided at the upper portion of the internal support bar, and a binding groove adapted to the paper tape is provided at the middle portion of the internal support bar.

[0010] Preferably, the direction of the breaking groove is set to be towards the side close to the central axis, and the shape of the notch of the breaking groove is a triangle.

[0011] Beneficial effects of the utility model:

[0012] On the voltage regulating coil, a sawtooth-shaped adjustment pad made of insulating cardboard is used to replace the traditional pad to adjust the assembly error of the coil. The external support bar adopts a three-stage staggered overlap and binding structure. The middle part of the external support bar is bound with PET tape, and the upper and lower ends of the external support bar are bound with paper tape. This greatly reduces the huge amount of repetitive work such as pad leveling and support bar hanging during the winding process of the voltage regulating coil, and solves the hidden dangers of easy detachment of the external paper tape binding of the voltage regulating coil and poor vibration resistance. By optimizing the internal and external support bar structure design of the converter transformer voltage regulating coil, the mechanical strength and stability of the internal and external support bars and binding structure can be significantly improved, thereby ensuring that the converter transformer can work stably and reliably under complex and changeable operating environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the description of the specific implementation or the prior art. Obviously, the drawings described below are some specific implementations of the utility model. For ordinary technicians in this field, other drawings within the protection scope of this application can be obtained based on these drawings without creative work;

[0014] Figure 1 This is a front view of the voltage regulating coil structure of an embodiment of the utility model;

[0015] Figure 2 It is a cross-sectional view of the voltage regulating coil structure of an embodiment of the utility model;

[0016] Figure 3 It is a structural schematic diagram of an adjustment pad strip according to an embodiment of the utility model;

[0017] Figure 4 4a is a front view and a right view of the internal support bar of the embodiment of the utility model, 4b is a right view;

[0018] Figure 5 It is a schematic diagram of the binding structure of the external stays of an embodiment of the utility model;

[0019] Figure 6 This is a schematic structural diagram of an external support bar 1 of an embodiment of the utility model;

[0020] Figure 7 This is a schematic structural diagram of the second external support bar of an embodiment of the utility model;

[0021] In the figure, 1 is the voltage regulating coil, 2 is the regulating pad, 3 is the coil head, 4 is the internal support bar, 5 is the external support bar one, 6 is the external support bar two, 7 is the external support bar three, 8 is the PET tape, 9 is the paper tape, and 10 is the breaking groove. DETAILED DESCRIPTION

[0022] The present invention is further described below by way of embodiments in conjunction with the accompanying drawings. The specific embodiments are as follows:

[0023] like Figure 1 , 2As shown, the internal and external support bar structure of the voltage regulating coil includes an adjustment pad 2, an internal support 4, an external support bar 1 5, an external support bar 2 6 and an external support bar 3 7. The voltage regulating coil 1 is provided with a plurality of coil outlets 3. The adjustment pads 2 are preferably fixedly arranged on both sides of the coil outlets 3 of the voltage regulating coil 1. The number of the adjustment pads 2 can also be increased or decreased according to the actual contraction value of the voltage regulating coil 1 after being pressed. The function of the adjustment pads 2 is to adjust the height of the voltage regulating coil to the calculated height by increasing or decreasing the number of the adjustment pads 2 according to the height after being pressed after the voltage regulating coil is pressed; the number and offset angle of the coil outlets 3 are determined by the actual parameters of the converter transformer. The internal strut 4 is placed on the side of the voltage regulating coil 1 close to the central axis, and is fixed by binding with a paper tape 9; the external strut 1 5, the external strut 2 6 and the external strut 3 7 are placed on the side of the voltage regulating coil 1 away from the central axis, and are fixed by binding with a PET tape 8, and are fixed by binding with a paper tape 9.

[0024] like Figure 3 As shown, the material of the adjusting pad strip 2 is insulating cardboard, and a plurality of sawtooth-shaped notches are provided on one side of the adjusting pad strip 2. The sawtooth-shaped adjusting pad strip 2 has a certain ductility, and the width of the adjusting pad strip 2 is the width of the voltage regulating coil 1. The length of the adjusting pad strip 2 can be set according to the inner circumference of the voltage regulating coil 1, and can be set to 1 / 3 or 1 / 4 of the inner circumference of the coil. The adjusting pad strip 2 needs to be placed in a complete circle, and it is more convenient to place the adjusting pad strip 2 during production, transportation and winding by dividing it into three or four sections; the sawtooth width is preferably set to 3-5mm, and the sawtooth length is preferably set to 1 / 3-2 / 3 of the width of the adjusting pad strip 2. In the prior art, the external support bar structure of the voltage regulating coil adopts the method of pad block hanging support bar. In the process of winding the voltage regulating coil, a large number of pad blocks and support bars need to be placed, and there are repetitive tasks with huge workload such as pad block leveling and support bar hanging. The utility model adopts a sawtooth-shaped adjusting pad strip 2 to replace the traditional pad block, and the sawtooth-shaped notch faces the outside of the coil. The use of the adjusting pad strip 2 is convenient for operation and has a small workload.

[0025] like Figure 4 As shown, the upper part of the internal support bar 4 is provided with a breaking groove 10 and an angle ring placement opening, and a binding groove adapted to the paper tape 9 is provided in the middle part to facilitate the binding of the paper tape 9. The breaking groove 10 is set to face the side close to the central axis, and the shape of the notch of the breaking groove 10 is triangular. Compared with the traditional rectangular notch, it can prevent the wire of the voltage regulating coil 1 from being stuck in the breaking groove 10 during the winding process to affect the radial size, and effectively reduce the workload of arranging the voltage regulating coil 1.

[0026] like Figure 2 , 5As shown, the external brace includes external brace 1 5, external brace 2 6 and external brace 3 7 which are arranged in three sections in a staggered overlap from top to bottom, and external brace 1 5, external brace 2 6 and external brace 3 7 are provided with a number of rectangular binding grooves. The lower part of external brace 1 5 and the upper part of external brace 2 6, the upper part of external brace 3 7 and the lower part of external brace 2 6 are bound with PET tape 8; the upper part of external brace 1 5 and the lower part of external brace 3 7 are bound with paper tape 9 instead of PET tape 8. Different from the traditional single-piece external brace structure, the staggered overlap and binding method between the external braces of the utility model can flexibly adjust the position of the external brace, avoid the large number of coil ends 3 of the voltage regulating coil 1, and do not require hanging pads, which greatly reduces the workload. A high-strength PET tape 8 is used to bind in the binding groove of the external support bar. The PET tape 8 will not fall off due to subsequent drying and pressing of the voltage regulating coil 1. Compared with the traditional paper tape 9 binding, the vibration resistance of the external support bar of the voltage regulating coil 1 is greatly enhanced.

[0027] The upper part of the external support bar 1 5 and the lower part of the external support bar 3 7 use 0.5mm thick paper tape 9 instead of PET tape 8, which is wrapped six times and tied at three to five places. This is beneficial to relieve the deformation stress of the end of the voltage regulating coil 1 caused by pressure, and improves the insulation strength tolerance of the end of the voltage regulating coil 1.

[0028] like Figure 6 As shown, the slotting position of the rectangular binding groove of the external brace 1 5 matches with the external brace 2 6, and the PET tape 8 is bound in the rectangular binding groove. The structure of the external brace 3 7 is the same as that of the external brace 1 5.

[0029] like Figure 7 As shown, the slotting position of the rectangular binding groove of the external support bar 2 6 matches with the external support bar 1 5 and the external support bar 3 7, and the PET tape 8 is bound in the rectangular binding groove. When binding, the external support bar 1 5, the external support bar 2 6 and the external support bar 3 7 need to be bound together with the voltage regulating coil.

[0030] The internal and external bracing structure of the voltage regulating coil of the utility model embodiment adopts high-strength and high-insulation materials, combined with innovative internal and external bracing structure design of the voltage regulating coil, to solve the technical problems existing in the traditional structure and improve the overall performance and service life of the converter transformer. This innovative design not only has high practical value, but also provides a strong guarantee for the safe and stable operation of the high-voltage direct current transmission system.

[0031] Finally, it should be noted that the above embodiments are only specific implementation methods of the present utility model, which are used to illustrate the technical solution of the present utility model, rather than to limit it, and the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solution recorded in the above embodiments within the technical scope disclosed by the present utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the present utility model, and should be covered within the protection scope of the present utility model.

Claims

1. The internal and external support bar structure of the voltage regulating coil is characterized by: It includes an adjusting pad, an internal strut, an external strut 1, an external strut 2 and an external strut 3; the internal strut is tied with a paper tape on the side of the voltage regulating coil close to the central axis, a plurality of rectangular binding grooves are provided in the width direction of the external strut 1, the external strut 2 and the external strut 3, the external strut 1, the external strut 2 and the external strut 3 are arranged in three sections from top to bottom in an alternating overlap manner on the side of the voltage regulating coil away from the central axis, the lower part of the external strut and the upper part of the external strut 2, the upper part of the external strut 3 and the lower part of the external strut 2 are tied with a PET tape, and the upper part of the external strut 1 and the lower part of the external strut 3 are tied with a paper tape; the adjusting pad is made of insulating cardboard, a plurality of serrated notches are provided on one side of the adjusting pad, the adjusting pad is arranged on both sides of the coil protruding from the voltage regulating coil, and the serrated notches of the adjusting pad face the outside of the coil.

2. The internal and external support bar structure of the voltage regulating coil according to claim 1, characterized in that: The width of the adjusting pad strip is the width of the voltage regulating coil, and the length of the adjusting pad strip is 1 / 3 or 1 / 4 of the inner circumference of the coil.

3. The internal and external support bar structure of the voltage regulating coil according to claim 2, characterized in that: The sawtooth width of the sawtooth-shaped notch of the adjusting pad strip is 3-5 mm, and the sawtooth length is 1 / 3-2 / 3 of the width of the adjusting pad strip.

4. The internal and external support bar structure of the voltage regulating coil according to claim 1, characterized in that: The upper part of the inner support bar is provided with a breaking groove and a corner ring placement opening, and the middle part of the inner support bar is provided with a binding groove adapted to the paper tape.

5. The internal and external support bar structure of the voltage regulating coil according to claim 4, characterized in that: The direction of the breaking groove is set to be towards the side close to the central axis, and the shape of the notch of the breaking groove is a triangle.

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