A wide-range current transformer core protection box

Abstract

This utility model relates to the field of current transformer technology, specifically to a core protection box for a wide-range current transformer. It includes an annular box body with an annular inner groove, the groove matching the shape of the core. The internal structure of the box body's wall is honeycomb-like. An epoxy resin layer is located between the outer surface of the core and the inner wall of the annular box body within the annular inner groove. The upper surface of the annular box body is flush with the upper surface of the epoxy resin layer. This application provides better protection for the core in two main ways. First, the honeycomb structure inside the annular box body offers advantages such as stability, high compressive strength, and uniform stress distribution. Second, the core is completely encased in the epoxy resin layer, effectively improving the insulation level of the entire current transformer. Furthermore, the epoxy resin, after curing, has high hardness and can fill the tiny gaps and voids inside the annular box body after casting, forming a unified whole with the annular box body and the core, thus enhancing structural stability.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, specifically to a wide-range current transformer core protection box. Background Technology

[0002] Currently, in order to meet the measurement accuracy requirements of wide-range current transformers, microcrystalline alloy wound strips are commonly used as core materials. Microcrystalline alloy wound strips have characteristics such as high magnetic permeability, but they are soft and fragile, so they usually need to be protected with protective boxes.

[0003] First, the protective box provides physical protection for the microcrystalline alloy wound strip, preventing damage from mechanical impacts and scratches. It also prevents the iron core from being exposed and accumulating dust and debris, which could affect the performance of the current transformer. Second, the protective box is typically made of insulating material, forming a strong insulating barrier between the wound strip and the surrounding environment. This improves the insulation performance of the current transformer, ensuring that it will not experience leakage, short circuits, or other safety accidents during operation, thus guaranteeing the safe and stable operation of the power system. In existing technology, the measuring-level transformer coil is usually installed at the bottom of a group of transformer coils and needs to bear a significant load. If the protective box has low structural strength or uneven stress leading to deformation, the iron core inside the protective box may deform or break under the weight, severely affecting performance.

[0004] However, existing protective boxes are usually of the upper and lower interlocking structure, with several insulating pads placed in the gap between the interlocking parts. Once such a protective box is subjected to a large force, the insulating pads are prone to displacement or even slippage, causing the protective box to deform directly. Moreover, the interlocking protective box is divided into upper and lower halves, not a one-piece structure, and there are gaps in the interlocking parts, resulting in low structural strength of the protective box, which has problems such as being not pressure resistant and being easy to deform. Utility Model Content

[0005] To address the technical problems of low structural strength, poor pressure resistance, and easy deformation of current transformer core protection boxes in existing technologies, this utility model provides a wide-range current transformer core protection box.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A wide-range current transformer core housing includes an annular box body with an annular inner groove. The annular inner groove of the annular box body matches the shape of the iron core. The internal structure of the box wall of the annular box body is a honeycomb structure. An epoxy resin layer is provided in the annular inner groove. The epoxy resin layer is located between the outer surface of the iron core and the inner wall of the annular box body. The upper surface of the annular box body is flush with the upper surface of the epoxy resin layer.

[0008] First, the interior of the annular box is designed with a honeycomb structure. From a mechanical perspective, each hexagonal unit in the honeycomb structure is interconnected, forming a stable geometry. This structure inherently possesses high compressive strength. When the annular box is subjected to external pressure, the force can be evenly distributed among the honeycomb units, preventing stress concentration in any one area. This significantly improves the overall strength of the annular box and effectively prevents localized deformation caused by uneven stress. For example, when subjected to compression from various directions, the honeycomb structure can evenly distribute the pressure, keeping the annular box stable and protecting the internal iron core. Furthermore, compared to a solid structure of the same thickness, the annular box in this application is lighter and has a higher material utilization rate.

[0009] Secondly, in this application, the iron core is completely encased in an epoxy resin layer, which effectively improves the insulation level of the entire current transformer, prevents faults such as leakage and short circuits, and ensures stable operation of the equipment under high-voltage environments. Furthermore, epoxy resin has high hardness after curing, and after casting, it can fill the tiny gaps and voids inside the annular housing, forming a unified whole with the annular housing and iron core, enhancing structural stability. Moreover, epoxy resin is resistant to most chemicals, resisting the corrosion of the annular housing and iron core by environmental factors such as moisture and acids / alkalis. In addition, epoxy resin can form a tight sealing layer during casting, effectively preventing moisture and humidity from entering the annular housing. The epoxy resin casting process is also relatively simple, requiring no complex equipment or advanced technology, and the price of epoxy resin is moderate. In large-scale production, it can ensure product quality while effectively controlling costs.

[0010] As a preferred implementation of a wide-range current transformer core casing, the honeycomb structure density on the outer wall of the annular casing is greater than that on the inner wall. The honeycomb structure on the outer wall has stronger resistance to impact and load-bearing capacity, while the honeycomb structure on the inner wall has stronger energy absorption capacity and more uniform stress.

[0011] As a preferred implementation of a wide-range current transformer core casing, the density of the honeycomb structure gradually decreases from the outer wall to the inner wall of the annular casing.

[0012] As a preferred implementation of a wide-range current transformer core casing, a reinforcing ring surrounds the outer circumference of the annular casing, with the upper and lower surfaces of the reinforcing ring flush with the upper and lower surfaces of the annular casing. The reinforcing ring can significantly improve the bending and torsional resistance of the annular casing. When the annular casing is subjected to impact or torsional force from the side, the reinforcing ring can play a restraining role, preventing excessive deformation of the annular casing.

[0013] As a preferred implementation of the core protection box for a wide-range current transformer, the reinforcing ring is made of metal.

[0014] As a preferred implementation of a wide-range current transformer core casing, the inner circumferential surface of the reinforcing ring is bonded to the outer circumferential surface of the annular casing. The connection method is simple and the cost is low.

[0015] As a preferred implementation of a core protection box for a wide-range current transformer, an annular cover is included, the size of which matches the annular box body. The annular box body can provide a certain degree of constraint and guidance for the magnetic field, helping to optimize the magnetic circuit of the current transformer, reduce magnetic field leakage, and improve the measurement accuracy and operating efficiency of the current transformer. Adding an annular cover can further enhance the constraint and guidance of the magnetic field.

[0016] As a preferred implementation of a wide-range current transformer core protective box, the lower surface of the annular cover is bonded to the upper surface of the annular box body. The connection method is simple and the cost is low.

[0017] As a preferred embodiment of a wide-range current transformer core casing, the inner surface of the annular casing is provided with several raised heat dissipation fins. These fins are distributed along the axial direction of the annular casing and are in close contact with the epoxy resin layer. The heat dissipation fins increase the contact area with the epoxy resin layer, effectively conducting away the heat generated during core operation, improving heat dissipation efficiency, and preventing excessive temperature from affecting the performance and service life of the current transformer.

[0018] As a preferred implementation of a wide-range current transformer core casing, an annular groove is provided at the lower edge of the annular casing cover. An annular rubber sealing ring is installed within the groove, protruding from the lower surface of the annular casing cover. The rubber sealing ring cooperates with the annular groove, further improving the sealing performance of the annular casing, while the annular groove secures the rubber sealing ring.

[0019] The beneficial effects of this novel invention include:

[0020] 1. The inner wall of the annular box is designed with a honeycomb structure. When the annular box is subjected to external pressure, the force can be evenly distributed to each honeycomb unit, avoiding stress concentration in a certain part, thereby greatly improving the overall strength of the annular box and effectively preventing local deformation caused by uneven force.

[0021] 2. In this application, the iron core is completely encased in an epoxy resin layer, which effectively improves the insulation level of the entire current transformer, prevents faults such as leakage and short circuits, and ensures stable operation of the equipment under high-voltage environments. Secondly, epoxy resin has high hardness after curing, and after casting, it can fill the tiny gaps and voids inside the annular housing, forming a unified whole with the annular housing and iron core, enhancing structural stability. Furthermore, epoxy resin is resistant to most chemicals, resisting the corrosion of the annular housing and iron core by environmental factors such as moisture and acids / alkalis. Moreover, epoxy resin can form a tight sealing layer during casting, effectively preventing moisture and humidity from entering the annular housing. The epoxy resin casting process is also relatively simple, requiring no complex equipment or advanced technology, and the price of epoxy resin is moderate. In large-scale production, it can both ensure product quality and effectively control costs. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of the annular box body of a wide-range current transformer core protective box in Embodiment 1 of the present utility model.

[0024] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of AA;

[0025] Figure 3 This is a schematic diagram of the structure of the annular cover of a wide-range current transformer core protective box in Embodiment 1 of the present utility model.

[0026] Figure 4 This is a front structural diagram of a wide-range current transformer core protective box in Embodiment 1 of the present utility model.

[0027] Figure 5 This is a cross-sectional structural diagram of the annular box body of a wide-range current transformer core protective box in Embodiment 2 of the present utility model.

[0028] Figure 6 This is a cross-sectional view of the annular cover of a wide-range current transformer core protective box in Embodiment 3 of this utility model.

[0029] List of components and reference numerals:

[0030] 1. Annular box body; 2. Iron core; 3. Epoxy resin layer; 4. Reinforcing ring; 5. Annular box cover; 6. Heat dissipation fins; 7. Rubber sealing ring. Detailed Implementation

[0031] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Example 1:

[0033] Reference Figure 1-4 This embodiment proposes a wide-range current transformer core protective box, including an annular cover 5 and an annular box body 1 with an annular inner groove. The annular inner groove of the annular box body 1 matches the shape of the iron core 2. The internal structure of the box wall of the annular box body 1 is a honeycomb structure, with the density of the honeycomb structure on the outer box wall being greater than that on the inner box wall. The honeycomb structure on the outer box wall has stronger resistance to impact and load-bearing capacity, while the honeycomb structure on the inner box wall has stronger energy absorption capacity and more uniform stress. Furthermore, the density of the honeycomb structure gradually decreases from the outer box wall to the inner box wall of the annular box body 1.

[0034] The internal structure of the annular box 1 is designed as a honeycomb structure instead of a solid structure. From a mechanical perspective, each hexagonal unit of the honeycomb structure is interconnected, forming a stable geometry. This structure inherently possesses high compressive strength. When the annular box 1 is subjected to external pressure, the force can be evenly distributed among the honeycomb units, preventing stress concentration in any one area. This significantly improves the overall strength of the annular box 1 and effectively prevents local deformation caused by uneven stress. For example, when subjected to compression from various directions, the honeycomb structure can evenly distribute the pressure, keeping the annular box 1 stable and protecting the internal iron core 2. Furthermore, compared to a solid structure of the same thickness, the annular box 1 in this embodiment is lighter and has a higher material utilization rate.

[0035] The annular housing 1 can be made of high-strength, high-toughness carbon fiber composite material, with an insulating coating, such as an epoxy resin coating, applied to its surface. This coating forms a reliable insulating layer on the housing surface, isolating current and ensuring the housing's insulation safety, thus protecting operators and surrounding equipment. Carbon fiber composite material is not only low in density and lightweight, but also possesses excellent strength and toughness, exceeding that of traditional materials. It also exhibits good impact resistance, effectively resisting external forces and reducing housing deformation under stress.

[0036] In addition, the internal structure of the ring box 1 in this embodiment is a honeycomb structure. Considering the structural defects that may occur in traditional manufacturing processes, the ring box 1 can be manufactured using 3D printing technology. 3D printing technology can accurately manufacture complex honeycomb structures. In order to form a honeycomb structure, the box wall of the ring box 1 in this embodiment is thicker than the iron core protective box in the prior art.

[0037] To further improve the bending and torsional resistance of the annular box 1, in this embodiment, a reinforcing ring 4 surrounds the outer circumference of the annular box 1, with the upper and lower surfaces of the reinforcing ring 4 flush with the upper and lower surfaces of the annular box 1. The reinforcing ring 4 is made of metal, such as lightweight and high-strength aluminum alloy. The reinforcing ring 4 can significantly improve the bending and torsional resistance of the annular box 1. When the annular box 1 is subjected to impact or torsional force from the side, the reinforcing ring 4 can play a restraining role, preventing the annular box 1 from deforming excessively.

[0038] To ensure a tight fit between the reinforcing ring 4 and the outer circumference of the annular box 1, a high-strength, weather-resistant epoxy resin adhesive can be used to bond the inner circumference of the reinforcing ring 4 to the outer circumference of the annular box 1. First, clean the mating surfaces of the annular box 1 and the reinforcing ring 4 to remove oil, dust, and other impurities to enhance adhesion. Then, evenly apply adhesive to one mating surface, accurately place the reinforcing ring 4 at the predetermined position on the outer shell of the annular box 1, apply pressure to ensure close contact, and maintain this position for a period of time until the adhesive is fully cured. This method is relatively simple, low-cost, and can guarantee a certain degree of bonding strength.

[0039] The annular cover 5 is a ring-shaped plate structure, and its dimensions match those of the annular box body 1. The lower surface of the annular cover 5 is bonded to the upper surface of the annular box body 1. The material of the annular cover 5 can be the same as that of the annular box body 1, and similarly, the internal structure of the annular cover 5 can also be a honeycomb structure. The annular box body 1 can provide a certain degree of constraint and guidance for the magnetic field, helping to optimize the magnetic circuit of the current transformer, reduce magnetic field leakage, and improve the measurement accuracy and working efficiency of the current transformer. Adding the annular cover 5 can further enhance the constraint and guidance of the magnetic field.

[0040] In this embodiment, an epoxy resin layer 3 is provided in the annular inner groove. The epoxy resin layer 3 is poured and filled between the outer surface of the iron core 2 and the inner wall of the annular box 1. The upper surface of the annular box 1 is flush with the upper surface of the epoxy resin layer 3, and the iron core 2 is completely wrapped in the epoxy resin layer 3.

[0041] First, epoxy resin possesses excellent electrical insulation properties. Casting it between the outer surface of the core 2 and the inner wall of the annular housing 1 effectively improves the insulation level of the entire current transformer, preventing leakage and short circuits, and ensuring stable operation under high voltage conditions. Second, epoxy resin has high hardness after curing. After casting, it fills the tiny gaps and voids inside the annular housing 1, forming a unified whole with the annular housing 1 and core 2, enhancing structural stability. When the annular housing 1 is subjected to external impact, the epoxy resin layer 3 can disperse stress, reducing local stress concentration, thereby improving the deformation resistance of the annular housing 1 and better protecting the internal core 2. Third, epoxy resin is resistant to most chemicals and can resist the corrosion of the annular housing 1 and core 2 by environmental factors such as moisture and acids / alkalis. In outdoor or industrial environments with corrosive gases, the annular housing 1 with the epoxy resin layer 3 can extend the service life of the current transformer and reduce maintenance costs. Fourth, during the casting process, epoxy resin can form a tight sealing layer, effectively preventing moisture and humidity from entering the interior of the annular housing 1. This is crucial for protecting the iron core 2, as moisture can cause it to rust and affect its magnetic properties. The epoxy resin layer 3 provides a dry environment for the iron core 2, ensuring its stable performance. Fifth, the epoxy resin casting process is relatively simple, requiring no complex equipment or advanced technology. Furthermore, epoxy resin materials are reasonably priced, allowing for both guaranteed product quality and effective cost control in large-scale production.

[0042] In this embodiment, in order to allow the epoxy resin to be poured onto the outer periphery of the iron core 2 and completely encapsulate the iron core 2 within the epoxy resin layer 3, a clamp can be used to first suspend and fix the iron core 2 in the annular inner groove of the annular box 1, and then the epoxy resin is poured. After the lower surface and sides of the iron core 2 are encapsulated by the epoxy resin, the clamp is released, and the epoxy resin is poured to encapsulate the upper surface of the iron core 2 as well, until the epoxy resin is flush with the upper surface of the annular box 1. After the epoxy resin cures, the epoxy resin layer 3 is formed.

[0043] Example 2:

[0044] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that:

[0045] Reference Figure 5In this embodiment, the inner surface of the annular box 1 is provided with several raised heat dissipation fins 6. The heat dissipation fins 6 are distributed along the axial direction of the annular box and are in close contact with the epoxy resin layer 3. The heat dissipation fins 6 can increase the contact area with the epoxy resin layer 3, effectively conduct away the heat generated by the iron core 2 during operation, improve heat dissipation efficiency, and prevent the performance and service life of the current transformer from being affected by excessive temperature.

[0046] Example 3:

[0047] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that:

[0048] Reference Figure 6 In this embodiment, an annular groove is provided at the lower edge of the annular cover 5, and an annular rubber sealing ring 7 is installed in the groove, protruding from the lower surface of the annular cover 5. The rubber sealing ring 7 cooperates with the annular groove, which can further improve the sealing performance of the annular box 1 and provide cushioning protection for the annular box 1. The annular groove can fix the rubber sealing ring 7. The rubber sealing ring 7 only needs to protrude 1 mm from the lower surface of the annular cover 5.

[0049] In this embodiment, the iron core 2 can specifically refer to a material similar to microcrystalline alloy wound strip, which has high magnetic permeability and is soft and brittle. Compared with the prior art, the annular box 1 in this embodiment can better protect the soft and brittle iron core 2 of the microcrystalline alloy wound strip.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wide-range current transformer core housing, comprising an annular box body (1) having an annular inner groove, wherein the annular inner groove of the annular box body (1) matches the shape of the iron core (2), characterized in that, The internal structure of the ring box (1) is a honeycomb structure. An epoxy resin layer (3) is provided in the annular inner groove. The epoxy resin layer (3) is located between the outer surface of the iron core (2) and the inner wall of the ring box (1). The upper surface of the ring box (1) is flush with the upper surface of the epoxy resin layer (3).

2. The wide-range current transformer core protection box according to claim 1, characterized in that, The density of the honeycomb structure on the outer wall of the annular box (1) is greater than the density of the honeycomb structure on the inner wall.

3. A wide-range current transformer core protection box according to claim 2, characterized in that, From the outer wall of the annular box (1) to the inner wall, the density of the honeycomb structure gradually decreases.

4. The wide-range current transformer core protection box according to claim 1, characterized in that, The outer periphery of the annular box (1) is surrounded by a reinforcing ring (4), and the upper and lower surfaces of the reinforcing ring (4) are flush with the upper and lower surfaces of the annular box (1).

5. A wide-range current transformer core protection box according to claim 4, characterized in that, The reinforcing ring (4) is made of metal.

6. A wide-range current transformer core protection box according to claim 4, characterized in that, The inner circumferential surface of the reinforcing ring (4) is bonded to the outer circumferential surface of the annular box (1).

7. A wide-range current transformer core protection box according to claim 1, characterized in that, Includes an annular box cover (5), the size of which matches the annular box body (1).

8. A wide-range current transformer core protection box according to claim 7, characterized in that, The lower surface of the annular box cover (5) is bonded to the upper surface of the annular box body (1).

9. A wide-range current transformer core protection box according to claim 1, characterized in that, The inner surface of the annular box (1) is provided with several protruding heat dissipation fins (6). The heat dissipation fins (6) are distributed along the axial direction of the annular box (1) and are in close contact with the epoxy resin layer (3).

10. A wide-range current transformer core protection box according to claim 1, characterized in that, A ring groove is provided at the lower edge of the ring cover (5), and a ring-shaped rubber sealing ring (7) is installed in the ring groove. The rubber sealing ring (7) protrudes from the lower surface of the ring cover (5).

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