Method for preventing coil burst of air-core reactor under instantaneous large current

Abstract

The application discloses a method for preventing the explosion of a hollow reactor coil under a large instantaneous current, and adopts a hollow reactor coil with a concentric circular winding structure, improves the state of the Lorentz force of the hollow reactor coil, reduces the influence of the Lorentz force of the hollow reactor coil under a large instantaneous current, and prevents the explosion of the hollow reactor coil under the large instantaneous current. The distribution of the Lorentz force of the hollow reactor coil is improved by adjusting the structure of the hollow reactor coil, so that the shape of the hollow reactor coil is infinitely close to a circle, and the Lorentz force received by the coil under a large instantaneous current is uniformly distributed in the radial direction. The application improves the distribution of the Lorentz force of the hollow reactor coil, reduces the influence of the Lorentz force on the coil under a large instantaneous current, greatly improves the ability of the hollow reactor coil to resist the impact of the current, can resist the impact of a current of several hundred kiloamperes, and does not explode, so that the reactor itself is a product without splinters and other flying objects to damage equipment.

Description

Technical Field

[0001] This invention relates to a safety protection method for air-core reactor coils, and more particularly to a method for preventing air-core reactor coils from exploding under instantaneous high current. This method for preventing air-core reactor coils from exploding under instantaneous high current can further improve the performance of air-core reactor coils in resisting instantaneous high current; it belongs to the field of air-core anode reactor manufacturing technology. Background Technology

[0002] In the field of DC power transmission and distribution, in order to limit the rate of current rise and transient steep-slope impulse voltage when the thyristor is turned on, and to cooperate with the damping circuit to improve the uneven voltage distribution between series-connected thyristors and reduce the stress caused by non-periodic triggering during interference and normal commutation, as well as the stress during leading-edge impulse voltage, an anode reactor needs to be connected in series in the circuit. One fault condition is that a very large short-circuit current will occur during a system short-circuit fault, reaching hundreds of kiloamperes, and the electromagnetic force will reach hundreds or thousands of kilonewtons; the instantaneous release of energy can cause the product to explode like a bomb, and the shock wave and debris generated by the explosion can damage other components within the equipment, thus causing the entire system to fail.

[0003] According to the inventors' research on this phenomenon, the main reason for this problem is that the current-carrying conductors in each enclosure of the air-core reactor coil are in a magnetic field, and the Lorentz force on these conductors causes an electrodynamic force. This electrodynamic force generates mechanical stress in each enclosure and is partially transmitted to the air-core coil of the air-core reactor structure. Under rated current, this electrodynamic force has little impact during normal operation. However, during transient high-current surges, a large current flows through the air-core reactor, causing a sharp increase in electrodynamic force. When this force reaches a certain level, it can lead to the reactor bursting. Furthermore, the research also revealed that the electrodynamic force induced by the Lorentz force is closely related to the structure of the air-core reactor coil. Since most current air-core reactor coils are circular and often made by spirally winding copper strips, this type of coil, according to the principle of Lorentz force generation, is prone to uneven distribution of the Lorentz force. It is precisely this uneven distribution of the Lorentz force that generates a large accumulation of electrodynamic force. The mechanical strength of such hollow-wound coils is insufficient; although the transient process is very short, the force is considerable, causing deformation of the reactor's air-core coil. This can damage or even shatter the entire reactor, leading to power outages in the entire DC transmission and distribution system and causing incalculable consequences. Therefore, it is essential to improve this design.

[0004] The search revealed no identical technical reports, only technical literature in related fields. The most similar articles are as follows:

[0005] 1. Patent No. CN200820110863.4, entitled "A Coil Structure of a Reactor," applied for by TBEA Co., Ltd. and State Grid Corporation of China, discloses a coil structure for a reactor. The reactor includes two or more independent reactor bodies, with coils inside each reactor body connected together. The connection can be series or parallel. The main improvement of this patent lies in using two or more reactor bodies in parallel. Compared with single-phase iron-core reactors, the compression of the iron core column and the clamping of the yoke are easier to ensure, thereby controlling noise and vibration. For products of the same capacity, using multiple reactor bodies means a reduction in the capacity of a single column, thus improving the concentration of reactor losses and the temperature distribution of the entire product, avoiding local hot spots in the reactor body. However, it does not address how to solve the problem of instantaneous high-current explosion.

[0006] 2. Patent No. CN201520636699.0, entitled "A Segmented Multilayer Reactor Coil Structure," applied for by Kunshan Special Transformer Manufacturing Co., Ltd., discloses a segmented multilayer reactor coil structure, comprising: several winding coil segments arranged sequentially from top to bottom, each segment of the winding coil being formed by several layers of conductor wires wound together, with each layer of conductor wires connected in series, and each segment of the winding coils connected in series; interlayer insulation, respectively disposed between adjacent layers of conductor wires in each segment of the winding coil; and segment insulation, composed of an insulating non-magnetic mesh structure material, respectively disposed between adjacent segments of conductor wires in the same layer. This patent does not address how to solve the problem of instantaneous high-current explosion.

[0007] 3. A utility model patent application with patent number CN202121502535.0, entitled "An Electromagnetic Pulse Filtering Power Supply Lightning Protection Structure," filed by Shunte Electric Equipment Co., Ltd., discloses a coil for an ultra-high voltage air-core reactor, comprising: a winding, an insulating layer, and at least two terminal components. The winding adopts an internally shielded winding structure, comprising several disc-shaped coils. End insulation is provided at both ends of the winding, and inter-segment insulation is provided between each disc-shaped coil. The insulating layer wraps around the winding. At least two terminal components are connected to the outer side of the winding and extend from the outer ring of the winding through the insulating layer to the outside of the winding, and are fixed to a support plate. This patent does not address how to solve the problem of instantaneous high-current explosion.

[0008] Although the aforementioned patents all involve air-core reactor coils and have made improvements to certain technical issues, none of these patented technologies address how to resist the impact of instantaneous high currents and prevent the reactor from exploding. Thus, the aforementioned problems still exist, and it is necessary to improve them. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an air-core reactor coil that is not good at resisting the impact of instantaneous large current and preventing the reactor from exploding, in order to address the problem that current air-core reactor coils are not good at resisting the impact of instantaneous large current and preventing the reactor from exploding.

[0010] This invention is mainly achieved through the following technical solution: a method to prevent the air-core reactor coil from exploding under instantaneous high current, which adopts an air-core reactor coil with a concentric circle winding structure. By improving the state of the Lorentz force of the air-core reactor coil, the influence of the Lorentz force of the air-core reactor coil under instantaneous high current impact is reduced, thereby preventing the air-core reactor coil from exploding under instantaneous high current.

[0011] Furthermore, the improvement of the Lorentz force state of the air-core reactor coil includes improving the distribution of the Lorentz force of the air-core reactor coil, so that the radial Lorentz force distribution of the air-core reactor coil is more uniform when subjected to instantaneous high current impact, thereby reducing the impact of the Lorentz force generated by the instantaneous high current on the coil explosion.

[0012] Furthermore, the improvement of the Lorentz force distribution in the air-core reactor coil is achieved by adjusting the structure of the air-core reactor coil so that the shape of the air-core reactor coil is infinitely close to a circle. This ensures that the Lorentz force on the air-core reactor coil is evenly distributed radially when a large instantaneous current is generated, preventing the air-core reactor coil from cracking due to uneven radial Lorentz force distribution under a large instantaneous current.

[0013] Furthermore, the method of making the shape of the hollow reactor coil infinitely close to a circle includes changing the winding method of the hollow reactor coil winding, so that the coiled hollow reactor coil is close to a circle, thus eliminating the uneven radial distribution of Lorentz force caused by the non-circular coil winding structure of the hollow reactor coil.

[0014] The hollow reactor coil being infinitely close to a circle refers to the fact that the inner section of the coil of the hollow reactor coil output row has an arc-shaped structure. The first row is embedded and fixed in the coil mold core; the last row is first positioned and finally fixed to the reactor shell. This makes the coiled hollow reactor coil close to a circle, thereby resisting the axial Lorentz force generated by the reactor coil.

[0015] Furthermore, the improvement of the Lorentz force state of the air-core reactor coil includes placing a stainless steel cylinder around the air-core coil. By placing the stainless steel cylinder around the outer periphery of the air-core reactor coil, the stainless steel cylinder resists the deformation of the air-core reactor coil caused by the Lorentz force when the air-core reactor coil experiences a sudden large current, thereby preventing the air-core reactor coil from bursting.

[0016] Furthermore, the stainless steel cylinder has an open structure; an opening connector and fasteners are provided at the opening. The gap between the stainless steel cylinder and the outer periphery of the hollow reactor coil is eliminated by fastening with the fasteners and connectors, so that the gap between the stainless steel cylinder and the outer periphery of the hollow reactor coil is minimized, thereby avoiding deformation caused by the Lorentz force under instantaneous high current.

[0017] Furthermore, the gap between the outer periphery of the hollow reactor coil and the stainless steel cylinder is filled with a rigid material, so that the outer periphery of the hollow reactor coil does not deform when the stainless steel cylinder resists the Lorentz force generated by the instantaneous large current.

[0018] Furthermore, the improvement of the Lorentz force state of the air-core reactor coil includes reducing the diameter of the air-core reactor coil, using multiple air-core reactor coils in combination, and reducing the magnitude of the Lorentz force as much as possible by changing the current and inductance of individual coils, thereby eliminating or avoiding the influence of the Lorentz force during instantaneous large currents.

[0019] Furthermore, the arrangement of multiple air-core reactor coils includes a parallel arrangement of two air-core reactor coils, with the two air-core reactor coils arranged in opposite or opposite directions, so that the Lorentz forces generated by the two air-core reactor coils are opposite or cross directions, thereby achieving mutual cancellation of the Lorentz forces.

[0020] The beneficial effects of this invention are:

[0021] This invention mitigates the Lorentz force effect on the air-core reactor coil, preventing damage from instantaneous high currents. It offers the following advantages:

[0022] 1) The air-core reactor coil of the present invention is wound with copper strip, and the shape of the air-core reactor coil is designed to be infinitely close to a circle, so that the Lorentz force on the coil under instantaneous large current is evenly distributed in the radial direction.

[0023] 2) The gaps inside the coil that cannot be eliminated in this invention are filled with rigid material to reduce the space for coil deformation under stress;

[0024] 3) The present invention wraps a stainless steel cylinder around the coil, and the gap between the coil and the stainless steel cylinder is filled with a rigid material. The stainless steel cylinder resists the Lorentz force generated by the instantaneous large current, so that the coil does not deform.

[0025] 4) The combination of multiple hollow coils in this invention reduces the magnitude of the Lorentz force as much as possible by changing the current and inductance of a single coil. This method can also be used to connect various series and parallel structures according to the requirements of the external shape and volume.

[0026] 5) After the hollow reactor assembly of the present invention is fixed, it is installed in the box and then the whole assembly is potted with elastic thermally conductive adhesive. The elastic thermally conductive adhesive plays a buffering role and can resist the slight deformation of the coil under the Lorentz force. Attached Figure Description

[0027] Figure 1 A schematic diagram illustrating the Lorentz force analysis of an air-core reactor coil;

[0028] Figure 2 This is a schematic cross-sectional view of the air-core reactor coil structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the arc-shaped cable outlet structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the air-core reactor coil with a stainless steel cylindrical structure according to the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the air-core reactor coil arranged in the reactor according to the present invention. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] As attached Figure 1-5 As shown, a method for preventing the air-core reactor coil from exploding under instantaneous high current employs a concentrically wound air-core reactor coil. Research has found that this type of wound air-core reactor coil generates an electromagnetic field around the current-flowing path when current passes through it, and also generates a Lorentz force along the winding copper busbar, as shown in the attached diagram. Figure 1As shown, according to the principle of Lorentz force judgment, this Lorentz force is emitted outward in the radial direction of the current flow in the copper busbar, thus generating electrodynamic force. The reason why the air-core reactor coil explodes under instantaneous high current is mainly due to the effect of this electrodynamic force, and primarily because the uneven application of this electrodynamic force causes stress accumulation, leading to the explosion of the air-core reactor coil. If a concentric circle-shaped coil structure is used for the air-core reactor coil, the Lorentz force distribution of the air-core reactor coil can be effectively changed, making the Lorentz force distribution of the air-core reactor coil more uniform. By improving the state of the Lorentz force in the air-core reactor coil, the influence of the Lorentz force during instantaneous high current impact is reduced, thereby preventing the air-core reactor coil from exploding under instantaneous high current.

[0035] The hollow reactor coil with a concentric circle winding structure is made of copper strip 2, which is wound layer by layer in a concentric circle shape to form the hollow reactor coil 1. The entire hollow reactor coil 1 has a concentric circular structure, as shown in the attached figure. Figure 2 As shown.

[0036] The improvement of the Lorentz force state of the air-core reactor coil includes improving the distribution of the Lorentz force in the air-core reactor coil, so that the radial Lorentz force distribution of the air-core reactor coil is more uniform when subjected to instantaneous high current impact, thereby reducing the impact of the Lorentz force generated by the instantaneous high current on the coil explosion. Experiments revealed that in traditional coiled air-core reactors, the lead-out bars are directly welded to the ends of the coil, creating a protrusion at the end. This results in a non-circular deformation of the air-core reactor coil when it is embedded in the coil core. Research indicates that this coil condition leads to uneven radial Lorentz force distribution, causing varying electrodynamic forces across the coil. This uneven distribution can easily lead to stress accumulation and ultimately, the air-core reactor coil cracking. Changing this condition to achieve a uniform radial Lorentz force distribution effectively corrects this uneven stress distribution.

[0037] The improvement of the Lorentz force distribution in the air-core reactor coil is achieved by adjusting the structure of the air-core reactor coil so that its shape is infinitely close to a circle. This ensures that the Lorentz force on the air-core reactor coil is evenly distributed radially when a large instantaneous current is generated, preventing the air-core reactor coil from cracking due to uneven radial Lorentz force distribution under a large instantaneous current.

[0038] The method of making the shape of the air-core reactor coil infinitely close to a circle includes changing the winding method of the air-core reactor coil so that the coil is nearly circular. This ensures that the Lorentz force generated in all directions is uniform, eliminating the uneven radial distribution of Lorentz force caused by the non-circular winding structure of the air-core reactor coil, as shown in the attached figure. Figure 2 As shown.

[0039] The near-circular shape of the hollow reactor coil refers to setting the internal section 4 of the coil output terminal block 3 of the hollow reactor to an arc-shaped cross-section (as shown in the attached diagram). Figure 3 and 4 As shown), the lead busbar is divided into two sections. The section 4, which extends into the coil of the hollow reactor, has a cross-sectional arc shape 9 that matches the diameter of the hollow reactor coil in which the lead busbar 3 is located, to eliminate the influence of the sudden diameter change during the original winding process. The part 5 outside the coil of the lead busbar 3 has a straight cross-section. The first row 6 of the lead busbar 3 is embedded and fixed in the coil mold core. The arc-shaped lead busbar 3 guides the hollow reactor coil to wind in a near-concentric circle manner, so that the radial Lorentz force distribution of the wound hollow reactor coil is uniform in all directions. The last row 7 of the lead busbar is first positioned and finally fixed to the reactor shell 10 (as shown in the attached diagram). Figure 5 (As shown in the figure); this makes the coiled hollow reactor coil nearly circular, thereby resisting the radial Lorentz force generated by the hollow reactor coil 1. The arc is inserted into the inner surface of the coil, and the part connecting the lead-out bar to the first row of the coil is slotted (not shown in the figure), so that the first row of the coil is stuck in the slot of the lead-out bar, and then connected by side welding, so that the lead-out bar and the first row of the coil form an arc connection, which is more conducive to the entire coil becoming circular when coiled.

[0040] The improvement of the Lorentz force state of the air-core reactor coil includes positioning the air-core coil by placing a stainless steel cylinder 11 around its outer casing (as shown in the attached diagram). Figure 4 As shown, a stainless steel cylinder 11 is fitted around the outer periphery of the air-core reactor coil 1, which allows the air-core reactor coil 1 to be shaped and positioned, and also makes the air-core reactor coil 1 closer to the shape of a concentric circle. In this way, when there is a large instantaneous current, the stainless steel cylinder 11 can also resist the deformation of the air-core reactor coil caused by the Lorentz force, thereby preventing the air-core reactor coil from exploding.

[0041] The stainless steel cylinder 11 has an open structure; an opening connector 12 and a fastener 13 are provided at the opening. The fastener 13 and the connector 12 are used to fasten and eliminate the gap between the stainless steel cylinder 11 and the outer periphery of the hollow reactor coil 1, so that the gap between the stainless steel cylinder 11 and the outer periphery of the hollow reactor coil 1 is minimized, thereby avoiding the deformation caused by the Lorentz force when a large instantaneous current is applied.

[0042] The gap between the outer periphery of the hollow reactor coil 1 and the stainless steel cylinder 11 is filled with a rigid material so that the outer periphery of the hollow reactor coil 1 does not deform when the stainless steel cylinder 11 resists the Lorentz force generated by the instantaneous large current.

[0043] The improvement of the Lorentz force state of the air-core reactor coil includes reducing the diameter of the air-core reactor coil and using multiple air-core reactor coils arranged in a combination (as shown in the attached figure). Figure 5 As shown), the magnitude of the Lorentz force is reduced as much as possible by changing the current and inductance of a single coil, thus eliminating or avoiding the effect of the Lorentz force during instantaneous high current.

[0044] The aforementioned arrangement of multiple air-core reactor coils includes a parallel arrangement of two air-core reactor coils (as shown in the attached diagram). Figure 5 As shown, the two air-core reactor coils are arranged in opposite or opposite directions, so that the Lorentz forces generated by the two air-core reactor coils are opposite or cross each other, thus achieving mutual cancellation of the Lorentz forces.

[0045] Example 2

[0046] The principle of Example 2 is the same as that of Example 1, but the structure is different. It is a method to prevent the air-core reactor coil from exploding under instantaneous high current. It adopts an air-core reactor coil with a concentric circle winding structure. By improving the state of the Lorentz force of the air-core reactor coil, the influence of the Lorentz force on the air-core reactor coil under instantaneous high current impact is reduced, thereby preventing the air-core reactor coil from exploding under instantaneous high current.

[0047] The method of improving the Lorentz force state of the air-core reactor coil involves winding the air-core reactor coil in a coiling manner, and winding the coil in a circular shape to make the coil of the air-core reactor coil close to a circular shape. This improves the distribution of the Lorentz force in the air-core reactor coil, and reinforces the air-core reactor coil to prevent deformation and cracking under instantaneous high current conditions.

[0048] The method of winding the coil in a circular shape involves setting the cross-section of the inner section of the coil output row of the air-core reactor coil to an arc shape. The first row of the air-core reactor coil is embedded and fixed in the coil mold core, making the upper surface of the first row of the coil arc-shaped. This eliminates the impact of the protruding upper surface of the first row of the coil on the circular winding of the coil. As a result, when the coils adjacent to the first row of the coil are wound, they will be closer to a circle, making the wound coil close to a circle.

[0049] The aforementioned method of setting the cross-section of the inner section of the air-core reactor coil output bar to an arc shape involves dividing the part connecting the air-core reactor coil output bar to the air-core reactor coil into two parts; one part has an arc-shaped cross-section, which is inserted into the inner surface of the coil, and a slot is made in the part where the output bar insertion part connects to the first row of the coil, so that the first row of the coil is stuck in the slot of the output bar, and then connected by welding, so that the output bar and the first row of the coil form an arc connection, which is more conducive to the entire coil becoming circular when wound.

[0050] When winding the coil, multiple arc-shaped pads are used to continuously fill the gaps inside the coil to prevent deformation of the coil under the action of Lorentz force when a large current is applied instantaneously.

[0051] The tail section of the hollow reactor coil is first positioned according to a circle and then fixed to the reactor shell. This makes the shape of the coil after winding the hollow reactor coil also circular, which helps to fix the shape of the coil.

[0052] The method of reinforcing the air-core reactor coil includes wrapping the air-core reactor coil with a stainless steel cylinder, filling the gap between the coil and the stainless steel cylinder with a rigid material, and tightening the air-core reactor coil with the stainless steel cylinder. This makes the air-core reactor coil closer to a circle, and the stainless steel cylinder resists the Lorentz force generated by the instantaneous large current, preventing the coil from deforming.

[0053] The stainless steel cylinder first needs to be calculated based on the magnitude of the simulated Lorentz force to determine the thickness of the stainless steel cylinder. The stainless steel cylinder cannot be closed and is designed to be open. Stainless steel plates are welded on both sides of the opening, and bolt holes are pre-made on the stainless steel plates. When the hollow reactor is assembled, the stainless steel cylinder is contracted by tightening the stainless steel bolts, thereby tightening the coil.

[0054] The method of reinforcing the hollow reactor coil includes installing the hollow reactor coil, which is wrapped in a stainless steel cylinder, into a closed box, and then filling the entire box with elastic thermally conductive adhesive. The elastic thermally conductive adhesive acts as a buffer to further resist the deformation of the coil under Lorentz force.

[0055] The air-core reactor coil is a single coil, so there is no issue of multiple coils; this is also feasible in situations with ample space, but the single-coil structure needs to be more robust.

[0056] The embodiments listed above are merely for clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention. Simultaneously, the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the present invention, should still fall within the scope of the technical content disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] The beneficial effects of this invention are:

[0058] This invention mitigates the Lorentz force effect on the air-core reactor coil, preventing damage from instantaneous high currents. It offers the following advantages:

[0059] 1) The air-core reactor coil of the present invention is wound with copper strip, and the shape of the air-core reactor coil is designed to be infinitely close to a circle, so that the Lorentz force on the coil under instantaneous large current is evenly distributed in the radial direction.

[0060] 2) The gaps inside the coil that cannot be eliminated in this invention are filled with rigid material to reduce the space for coil deformation under stress;

[0061] 3) The present invention wraps a stainless steel cylinder around the coil, and the gap between the coil and the stainless steel cylinder is filled with a rigid material. The stainless steel cylinder resists the Lorentz force generated by the instantaneous large current, so that the coil does not deform.

[0062] 4) The combination of multiple hollow coils in this invention reduces the magnitude of the Lorentz force as much as possible by changing the current and inductance of a single coil. This method can also be used to connect various series and parallel structures according to the requirements of the external shape and volume.

[0063] After the hollow reactor assembly of this invention is fixed, it is installed in the box and then the whole assembly is potted with elastic thermally conductive adhesive. The elastic thermally conductive adhesive plays a buffering role and can resist the slight deformation of the coil under Lorentz force.

Claims

1. A method for preventing the air-core reactor coil from exploding under instantaneous high current, comprising an air-core reactor coil with a concentric circular winding structure, characterized in that: A hollow reactor coil is fabricated using copper strips, wound layer by layer in a concentric circular pattern. The resulting coil has a concentric circular structure. By improving the Lorentz force state of the hollow reactor coil, the impact of the Lorentz force during a sudden high-current surge is reduced, thus preventing the coil from exploding under such conditions. This improvement in the Lorentz force state includes designing the internal section of the coil's output terminal block with an arc-shaped cross-section. The output terminal block is divided into two sections, with the internal section extending into the hollow reactor coil being connected to the output terminal block. The cross-sectional arc shape matches the diameter of the air-core reactor coil to eliminate the impact of abrupt diameter changes in the original coiling process; the portion outside the coil of the lead busbar has a straight cross-section; the first row of the lead busbar is embedded and fixed in the coil mold core, and the arc-shaped lead busbar guides the air-core reactor coil to wind in a near-concentric circle manner, so that the radial Lorentz force distribution in all directions of the wound air-core reactor coil is uniform; the last row of the lead busbar is positioned first and then fixed to the reactor shell; this makes the shape of the wound air-core reactor coil infinitely close to a circle, thereby resisting the radial Lorentz force generated by the air-core reactor coil.

2. The method for preventing the air-core reactor coil from exploding under instantaneous high current as described in claim 1, characterized in that: The inner section of the coil has a slot that connects to the first row of coils, allowing the first row of coils to be secured at the slot of the lead wire. The lead wire is then welded to the side, creating an arc connection between the lead wire and the first row of coils, which makes it easier for the entire coil to become circular when wound.

3. The method for preventing the air-core reactor coil from exploding under instantaneous high current as described in claim 1, characterized in that: The improvement of the Lorentz force state of the air-core reactor coil includes placing a stainless steel cylinder around the air-core coil. By placing the stainless steel cylinder around the outer periphery of the air-core reactor coil, the stainless steel cylinder resists the deformation of the air-core reactor coil caused by the Lorentz force when the air-core reactor coil experiences a sudden large current, thereby preventing the air-core reactor coil from bursting.

4. The method for preventing the air-core reactor coil from exploding under instantaneous high current as described in claim 3, characterized in that: The stainless steel cylinder has an open structure; an opening connector and fasteners are provided at the opening. The gap between the stainless steel cylinder and the outer periphery of the air reactor coil is eliminated by fastening with the fasteners and connectors, so that the gap between the stainless steel cylinder and the outer periphery of the air reactor coil is minimized, thereby avoiding deformation caused by the Lorentz force when a large instantaneous current is applied.

5. The method for preventing the air-core reactor coil from exploding under instantaneous high current as described in claim 4, characterized in that: The gap between the outer periphery of the hollow reactor coil and the stainless steel cylinder is filled with a rigid material, so that the outer periphery of the hollow reactor coil does not deform when the stainless steel cylinder resists the Lorentz force generated by the instantaneous large current.

6. The method for preventing the air-core reactor coil from exploding under instantaneous high current as described in claim 1, characterized in that: The improvement of the Lorentz force in the air-core reactor coil includes reducing the diameter of the air-core reactor coil, using multiple air-core reactor coils in combination, and reducing the magnitude of the Lorentz force as much as possible by changing the current and inductance of individual coils, thereby eliminating or avoiding the influence of the Lorentz force during instantaneous high current.

7. The method for preventing the air-core reactor coil from exploding under instantaneous high current as described in claim 6, characterized in that: The arrangement of multiple hollow reactor coils includes a parallel arrangement of two hollow reactor coils, with the two hollow reactor coils arranged in opposite or staggered directions, so that the Lorentz forces generated by the two hollow reactor coils are opposite or intersecting, thus achieving mutual cancellation of the Lorentz forces.

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