Current transformer capable of automatically changing turn ratio

Abstract

The utility model discloses an automatic turn ratio changing current transformer which comprises a left shell and a right shell, the left shell and the right shell are spliced with each other, a left half shaft is arranged in the left shell, butt joint lugs are arranged at the two ends of the left half shaft, a right half shaft is arranged in the right shell, butt joint grooves are formed in the two ends of the right half shaft, and the butt joint grooves and the butt joint lugs are spliced with each other. Coils are installed on the left half shaft and the right half shaft, and the left shell and the right shell are spliced through the butt joint grooves and the butt joint lugs, so that installation of the left shell and the right shell is completed. The butt joint groove and the butt joint lug are spliced to form a circular structure, and the circular structure is used for placing a coil; the whole structure is easy to disassemble and assemble.

Description

Technical Field

[0001] This utility model belongs to the field of current transformer technology, specifically relating to an automatic turns ratio current transformer. Background Technology

[0002] Automatic turns ratio (ATR) current transformers are critical devices used to measure and convert current signals to accurately reflect the operating status of power systems in protection and control systems. Traditional current transformers typically employ a fixed turns ratio design. However, in practical applications, power system loads and currents vary considerably, making a fixed turns ratio insufficient for all measurement needs. Therefore, ATR current transformers were developed to automatically adjust the turns ratio based on the actual conditions of the power system, thereby improving measurement accuracy and flexibility.

[0003] Traditional current transformers are often structurally complex, and their assembly and disassembly processes are cumbersome, causing numerous inconveniences for equipment maintenance, replacement, and on-site installation. Especially in high-voltage, high-current applications, the installation and disassembly of current transformers are not only time-consuming and labor-intensive but also pose significant safety risks. When current transformers are exposed to high current or high vibration environments, the coils may still experience slight loosening or displacement, thus affecting the accuracy and stability of measurements. Utility Model Content

[0004] The purpose of this invention is to provide an automatic turns ratio current transformer to solve the installation and transformer fixing problems in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic turns ratio current transformer includes a left housing and a right housing, which are joined together. The left housing contains a left half-shaft with mating lugs at both ends. The right housing contains a right half-shaft with mating grooves at both ends, which are joined to the mating lugs. Coils are mounted on both the left and right half-shafts. Each of the left and right housings contains a positioning assembly, which includes a first positioning block and a second positioning block. The first and second positioning blocks are arranged opposite each other, with the first positioning block on the inner wall of the left housing and the second positioning block on the outer wall of the right half-shaft. Similarly, the inner wall of the left housing also has a first positioning block, and the outer wall of the left half-shaft also has a second positioning block. A reinforcing assembly is installed between the first and second positioning blocks. A top cover is installed on top of the left and right housings.

[0007] Furthermore, the docking lug is composed of a rectangle and a circle, with the diameter of the circle being larger than the width of the rectangle, and the docking groove and the docking lug structure correspond to each other.

[0008] Furthermore, the reinforcement component includes an L-plate, a screw, and a positioning rod. The L-plate is located inside the left housing, and the screw passes through the left housing and is installed between the first and second positioning blocks. The screw is movably connected inside the first and second positioning blocks, and positioning rods are installed at both ends of the screw. The lower part of the L-plate is slidably installed on the positioning rod, and the lower middle part of the L-plate meshes with the screw.

[0009] Furthermore, the top cover surface has a shaft hole, the circular structure of the mating lug has a positioning hole, and the circular structure of the mating groove has a threaded hole.

[0010] Furthermore, a stabilizing block is provided at the bottom of the top cover, and rectangular cutouts are provided at the top of both the first positioning block and the second positioning block. The rectangular cutouts on the first positioning block and the second positioning block cooperate with the stabilizing block.

[0011] Furthermore, a rubber pad is provided at the bottom of the stabilizing block. The softness of the rubber pad allows it to better adapt to the unevenness of the coil surface. When the stabilizing block is pressed on top of the coil, the rubber pad can evenly distribute the pressure, preventing excessive local pressure that could damage the coil. This design improves the uniformity and stability of the coil under pressure.

[0012] The technical solution of this utility model has the following beneficial effects:

[0013] 1. The left and right shells are joined together by mating grooves and mating ears to complete the installation of the left and right shells; the mating grooves and mating ears form a circular structure after being joined together, which is used to place the coil; the whole structure is easy to disassemble and assemble.

[0014] 2. The bottom of the coil will contact the support below the L-plate, i.e., the short side of the L-plate; the end of the screw is a flathead head, which can be adjusted by rotating the screw with a screwdriver. By rotating the screw, the L-plate will slide on the positioning rod, so that the long side of the L-plate will squeeze and push the coil to stabilize and reinforce the installation position of the coil, further improving the stability of the equipment and avoiding the problem of the coil becoming loose. It can flexibly adapt to the installation of different coil sizes and shapes.

[0015] 3. When the top cover is installed, the stabilizing block will enter the rectangular cutout and press down on the coil, further improving the stability of the coil during use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the overall internal structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the disassembled structure of this utility model.

[0020] Figure 4 This is a cross-sectional view of the present invention.

[0021] Figure 5 This is a structural diagram of the top cover installation of this utility model.

[0022] Figure 6 This is a schematic diagram of the top cover bottom structure of this utility model.

[0023] Reference numerals: 10, left housing; 11, right housing; 12, left half-shaft; 13, mating lug; 14, positioning hole; 15, right half-shaft; 16, mating groove; 17, threaded hole; 20, top cover; 21, shaft hole; 22, stabilizing block; 23, rubber pad; 30, first positioning block; 31, second positioning block; 32, L-plate; 33, screw; 34, positioning rod; 35, rectangular cutout; 40, coil. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0025] Example 1:

[0026] refer to Figures 1-3 An automatic turns ratio current transformer includes a left housing 10 and a right housing 11, which are spliced ​​together. The left housing 10 has a left half-shaft 12 inside, and the two ends of the left half-shaft 12 have docking ears 13. The right housing 11 has a right half-shaft 15 inside, and the two ends of the right half-shaft 15 have docking grooves 16. The docking grooves 16 and the docking ears 13 are spliced ​​together. Coils 40 are installed on the left half-shaft 12 and the right half-shaft 15.

[0027] In the above design, the left housing 10 and the right housing 11 are joined together to form a single unit. The left housing 10 and the right housing 11 are connected by a mating groove 16 and a mating lug 13, thus completing the installation of the left housing 10 and the right housing 11. The mating groove 16 and the mating lug 13, when joined, form a circular structure for placing the coil 40. The entire structure is easy to disassemble and assemble, facilitating maintenance or replacement of internal components. This modular design improves the maintainability and flexibility of the product.

[0028] Further reference Figure 3 The docking lug 13 is composed of a rectangle and a circle, with the diameter of the circle being larger than the width of the rectangle. The docking groove 16 corresponds to the structure of the docking lug 13.

[0029] In a further implementation, the rectangular portion provides structural support, while the circular portion reduces the risk of damage by dispersing stress; and the fact that the diameter of the circle is larger than the width of the rectangle can stabilize the installation of the mating lug 13 and the mating groove 16, preventing them from falling off and improving the overall structural stability.

[0030] Example 2 (in conjunction with Example 1):

[0031] refer to Figure 1 and Figure 2 Both the left housing 10 and the right housing 11 are provided with positioning components. The positioning components include a first positioning block 30 and a second positioning block 31. The first positioning block 30 and the second positioning block 31 are arranged opposite to each other. The first positioning block 30 is on the inner wall of the left housing 10, and the second positioning block 31 is on the outer wall of the right half-shaft 15. Similarly, the inner wall of the left housing 10 is also provided with a first positioning block 30, and the outer wall of the left half-shaft 12 is also provided with a second positioning block 31.

[0032] In the above scheme, the coil 40 placed on the left half-shaft 12 and the right half-shaft 15 is positioned between the first positioning block 30 and the second positioning block 31. The first positioning block 30 and the second positioning block 31 can reduce the position adjustment space of the coil 40 inside the left housing 10 and the right housing 11, thereby improving the accuracy and efficiency of assembly. At the same time, they help prevent the coil 40 from shifting under vibration or external force, thus ensuring the stability and reliability of the coil 40.

[0033] Further reference Figures 2-4A reinforcing assembly is installed between the first positioning block 30 and the second positioning block 31. The reinforcing assembly includes an L-plate 32, a screw 33, and a positioning rod 34. The L-plate 32 is located between the first positioning block 30 and the second positioning block 31, and the screw 33 passes through the left housing 10 and is installed inside the first positioning block 30 and the second positioning block 31. The screw 33 is movably connected inside the first positioning block 30 and the second positioning block 31, and the positioning rods 34 are installed at both ends of the screw 33. The lower part of the L-plate 32 is slidably installed on the positioning rods 34, and the lower middle part of the L-plate 32 is engaged with the screw 33.

[0034] In a further embodiment, when the coil 40 is placed between the first positioning block 30 and the second positioning block 31, the bottom of the coil 40 will contact and support the underside of the L-plate 32, i.e., the short side of the L-plate 32; the tail end of the screw 33 is a flat head, which can be adjusted by rotating a screwdriver. By rotating the screw 33, the L-plate 32 will slide on the positioning rod 34, so that the long side of the L-plate 32 will squeeze and push the coil 40 to stabilize and reinforce the installation position of the coil 40, further improving the stability of the equipment and avoiding the problem of the coil 40 becoming loose. It can flexibly adapt to the installation of different sizes and shapes of coils 40.

[0035] Further reference Figure 3 and Figure 5 A top cover 20 is installed above the left housing 10 and the right housing 11. A shaft hole 21 is opened on the surface of the top cover 20. A positioning hole 14 is opened at the circular structure of the mating lug 13. A threaded hole 17 is opened at the circular structure of the mating groove 16.

[0036] In a further implementation, the installation of the mating lug 13 and the mating groove 16, the concentric fit of the threaded hole 17 and the positioning hole 14, and the use of the reinforcing components to stabilize the coil 40 are completed. The top cover 20 is then fastened onto the left housing 10 and the right housing 11. At the same time, the shaft hole 21 is concentrically fitted with the threaded hole 17 and the positioning hole 14. A bolt is inserted between the three and screwed into the threaded hole 17 to complete the assembly of the entire device. Finally, bolts are also installed at the four corners of the top cover 20 for positioning. The overall structure of the device is compact.

[0037] Example 3 (in conjunction with Example 2):

[0038] Further reference Figure 5 and Figure 6 The bottom of the top cover 20 is provided with a stabilizing block 22, and the top of the first positioning block 30 and the second positioning block 31 are both provided with rectangular cutouts 35. The rectangular cutouts 35 on the first positioning block 30 and the second positioning block 31 cooperate with the stabilizing block 22.

[0039] In a further implementation, when the top cover 20 is installed, the stabilizing block 22 will enter the rectangular cutout 35 and press on the coil 40, further improving the stability of the coil 40 during use.

[0040] Further reference Figure 6 The bottom of the stabilizing block 22 is equipped with a rubber pad 23. The softness of the rubber pad 23 allows it to better adapt to the unevenness of the coil 40 surface. When the stabilizing block 22 is pressed on top of the coil 40, the rubber pad 23 can evenly distribute the pressure, preventing excessive local pressure from damaging the coil 40. This design improves the uniformity and stability of the pressure on the coil 40.

[0041] The specific implementation process of this utility model is as follows:

[0042] The left housing 10 and right housing 11 are joined together by mating grooves 16 and mating ears 13 to complete the installation of the left housing 10 and right housing 11. The mating grooves 16 and mating ears 13 form a circular structure for placing the coil 40. The bottom of the coil 40 contacts and is supported under the L-plate 32, i.e., the short side of the L-plate 32. The end of the screw 33 is a flathead head, which can be adjusted by rotating it with a screwdriver. By rotating the screw 33, the L-plate 32 will slide on the positioning rod 34, thereby pressing and pushing the coil 40 with the long side of the L-plate 32 to stabilize and reinforce the installation position of the coil 40. The top cover 20 is then fastened onto the left housing 10 and right housing 11. At the same time, the shaft hole 21, the threaded hole 17, and the positioning hole 14 are concentrically fitted. A bolt is inserted between these three and screwed into the threaded hole 17 to complete the assembly of the entire device. Finally, bolts are also installed at the four corners of the top cover 20 for positioning.

[0043] The above embodiments are merely exemplary models of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions can be made to this utility model within its substance and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached circle, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, these terms indicating orientation or positional relationship should not be construed as limitations on this utility model.

[0045] In the description of this utility model, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between components; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

Claims

1. An automatic turns ratio changing current transformer, characterized in that: It includes a left shell (10) and a right shell (11), which are spliced ​​together. The left shell (10) has a left half shaft (12) inside, and the two ends of the left half shaft (12) have docking ears (13). The right shell (11) has a right half shaft (15) inside, and the two ends of the right half shaft (15) have docking grooves (16) opened. The docking grooves (16) are spliced ​​with the docking ears (13). Coils (40) are installed on the left half shaft (12) and the right half shaft (15). Both the left housing (10) and the right housing (11) are provided with positioning components. The positioning components include a first positioning block (30) and a second positioning block (31). The first positioning block (30) and the second positioning block (31) are arranged opposite to each other. The first positioning block (30) is on the inner wall of the left housing (10), and the second positioning block (31) is on the outer wall of the right half-shaft (15). Similarly, the inner wall of the left housing (10) is also provided with a first positioning block (30), and the outer wall of the left half-shaft (12) is also provided with a second positioning block (31). A reinforcing component is installed between the first positioning block (30) and the second positioning block (31), and a top cover (20) is installed above the left housing (10) and the right housing (11).

2. The automatic turns ratio changing current transformer according to claim 1, characterized in that: The docking lug (13) is composed of a rectangle and a circle, with the diameter of the circle being larger than the width of the rectangle. The docking groove (16) corresponds to the docking lug (13) in structure.

3. The automatic turns ratio changing current transformer according to claim 2, characterized in that: The reinforcement assembly includes an L-plate (32), a screw (33), and a positioning rod (34). The L-plate (32) is located inside the left housing (10). The screw (33) passes through the left housing (10) and is installed between the first positioning block (30) and the second positioning block (31). The screw (33) is movably connected inside the first positioning block (30) and the second positioning block (31). Positioning rods (34) are installed at both ends of the screw (33). The lower part of the L-plate (32) is slidably installed on the positioning rod (34). The lower middle part of the L-plate (32) meshes with the screw (33).

4. An automatic turns ratio changing current transformer according to claim 3, characterized in that: The top cover (20) has a shaft hole (21) on its surface, the docking ear (13) has a positioning hole (14) in its circular structure, and the docking groove (16) has a threaded hole (17) in its circular structure.

5. An automatic turns ratio changing current transformer according to claim 4, characterized in that: The bottom of the top cover (20) is provided with a stabilizing block (22), and the top of the first positioning block (30) and the second positioning block (31) are provided with rectangular cutouts (35). The rectangular cutouts (35) on the first positioning block (30) and the second positioning block (31) cooperate with the stabilizing block (22).

6. An automatic turns ratio current transformer according to claim 5, characterized in that: The bottom of the stabilizing block (22) is provided with a rubber pad (23).

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