Current transformer for measuring high-voltage current

Abstract

The utility model relates to the technical field of current transformers, in particular to a current transformer for high-voltage current measurement, which comprises a shell, windings are arranged in the shell, a plurality of wiring terminals are further mounted on the side face of the shell, one end of each wiring terminal is connected with the corresponding winding through a wire, and the other end of each wiring terminal is connected with the corresponding winding through a wire. Two mounting blocks are symmetrically mounted on the side, close to the wiring terminal, of the shell, a connecting shaft is rotationally connected between the two mounting blocks, a strip-shaped connecting block is mounted on the side face of the connecting shaft, one end of the strip-shaped connecting block extends to one side of the mounting block, and the other end of the strip-shaped connecting block extends to the other side of the mounting block. And the end of the strip-shaped connecting block is connected with a protective cover, and the protective cover covers the wiring terminal. The wiring terminal can be covered through the protective cover, the wiring terminal is separated from the external environment and cannot be oxidized by oxygen in the external environment, dust cannot be attached to the surface of the wiring terminal, and the protective effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, and in particular to a current transformer for high voltage current measurement. Background Technology

[0002] A current transformer is an instrument that measures a large primary current by converting it into a small secondary current based on the principle of electromagnetic induction.

[0003] Existing current transformers typically have a hollow housing, through which the cable being tested passes, allowing current detection via electromagnetic induction. However, due to the fixed size of the hollow portion in the housing, when testing multiple cables, the cable passing through first can obstruct subsequent cables, resulting in poor performance. Furthermore, the terminals on existing current transformers are generally exposed to the external environment, making them susceptible to oxidation from oxygen and dust accumulation, affecting the connection between the terminals and conductors and providing poor protection. Therefore, we propose a current transformer for high-voltage current measurement. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a current transformer for high-voltage current measurement.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a current transformer for high-voltage current measurement is designed, including a housing, a winding inside the housing, and several terminals installed on the side of the housing. One end of each terminal is connected to the corresponding winding through a wire, and the other end of the terminal is connected to an external device through a wire.

[0006] Two mounting blocks are symmetrically mounted on the side of the housing near the terminal block. A connecting shaft is rotatably connected between the two mounting blocks. A strip-shaped connecting block is mounted on the side of the connecting shaft. One end of the strip-shaped connecting block extends to one side of the mounting block, and a protective cover is connected to this end of the strip-shaped connecting block. The protective cover covers the terminal block.

[0007] The outer casing has several receiving slots on the side near the terminal block. The wires connected to the terminal block are located in the corresponding receiving slots. Both sides of the protective cover have skirts. The bottom of each skirt is equipped with several elastic pressure blocks. When the protective cover covers the terminal block, the bottom of each elastic pressure block extends into the corresponding receiving slot and presses against the surface of the wire.

[0008] The outer casing is also equipped with connecting rings on both sides. Each connecting ring has several pairs of elastic clips installed on its inner side. Each pair of elastic clips forms a slot. When the cable under test passes through the middle of the outer casing, the side of the cable under test is located in the slot.

[0009] Each connecting ring has several L-shaped fixing blocks installed on the side near the outer shell, and several strip-shaped fixing blocks are installed on the side of the outer shell. Each L-shaped fixing block is fixed on the corresponding strip-shaped fixing block.

[0010] Preferably, a rubber pad is installed on the inner surface of each receiving slot, and the inner surface of the rubber pad is sealed to the outer surface of the wire.

[0011] Preferably, each skirt has a fastening bolt at its top, and the bottom of each fastening bolt penetrates the corresponding skirt. The sides of the housing have symmetrically opened threaded holes. When the protective cover covers the terminal block, the fastening bolt is aligned with the threaded hole, and the bottom of the fastening bolt extends into the corresponding threaded hole and is threadedly connected to the threaded hole.

[0012] Preferably, both ends of the connecting shaft are connected to torsion springs, with one end of each torsion spring fixed to the side of the strip connecting block and the other end of each torsion spring fixed to the side of the corresponding mounting block.

[0013] Preferably, sealing gaskets are provided at the bottom of the protective cover and the bottom of the skirt.

[0014] Preferably, the elastic clip is made of an elastic metal material.

[0015] Preferably, a mounting base is installed on the bottom of the housing.

[0016] The design scheme proposed in this utility model has the following beneficial effects in application:

[0017] 1. The protective cover can cover the terminal block, isolating it from the external environment and preventing it from being oxidized by oxygen in the external environment. It also prevents dust from adhering to the surface of the terminal block, thus improving the protection effect.

[0018] 2. By installing connecting rings on both sides of the housing, the cable to be tested can be fixed to the inner edge of the housing by the elastic clips on the connecting rings when it passes through the middle of the housing. This will not hinder the subsequent passage of the cable through the housing and improve the performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the connecting ring structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the connection structure between the protective cover and the mounting block of this utility model;

[0022] Figure 4This is a side sectional view of the outer shell of this utility model.

[0023] In the diagram: 1. Mounting base; 2. Terminal block; 3. Rubber pad; 4. Receiving groove; 5. Threaded hole; 6. Fastening bolt; 7. Protective cover; 8. Elastic pressure block; 9. Skirt; 10. Connecting ring; 11. Housing; 12. L-shaped fixing block; 13. Strip fixing block; 14. Elastic retaining strip; 15. Connecting shaft; 16. Strip connecting block; 17. Mounting block; 18. Torsion spring; 19. Winding. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figures 1-4 A current transformer for high-voltage current measurement includes a housing 11, such as... Figure 1 and Figure 4 As shown, the housing 11 has a winding 19 inside, and several terminals 2 are installed on the side of the housing 11. One end of each terminal 2 is connected to the corresponding winding 19 through a wire, and the other end of the terminal 2 is connected to an external device through a wire. In actual use, the cable to be tested passes through the middle of the housing 11, so that the current transmitted by the cable can be detected under the action of electromagnetic induction.

[0026] like Figure 1 and Figure 3 As shown, two mounting blocks 17 are symmetrically installed on the side of the housing 11 near the terminal 2. A connecting shaft 15 is rotatably connected between the two mounting blocks 17. A strip-shaped connecting block 16 is installed on the side of the connecting shaft 15. One end of the strip-shaped connecting block 16 extends to one side of the mounting block 17, and a protective cover 7 is connected to this end of the strip-shaped connecting block 16. The protective cover 7 covers the terminal 2. In actual use, after the wire is connected to the terminal 2, the operator can cover the terminal 2 with the protective cover 7 to isolate the terminal 2 from the external environment and protect the terminal 2 from oxidation and corrosion by the external environment. The connection between the terminal 2 and the wire will not be affected by dust.

[0027] like Figure 1 As shown, the outer casing 11 has several receiving slots 4 on the side near the terminal 2. The wires connected to the terminal 2 are all located in the corresponding receiving slots 4. In actual use, the wires connected to the terminal 2 can be laid in the receiving slots 4. In this way, when the protective cover 7 is placed on the terminal 2, the wires will not obstruct the protective cover 7.

[0028] like Figure 1 and Figure 3 As shown, the protective cover 7 has skirts 9 extending from both sides. Each skirt 9 has several elastic pressure blocks 8 installed at its bottom. When the protective cover 7 covers the terminal 2, the bottom of each elastic pressure block 8 extends into the corresponding receiving groove 4 and presses against the surface of the wire. Each receiving groove 4 has a rubber pad 3 installed on its inner surface. The inner surface of the rubber pad 3 is sealed to the outer surface of the wire. In actual use, when the protective cover 7 covers the terminal 2, the elastic pressure block 8 will squeeze the wire in the receiving groove 4, so that the wire is sealed with the rubber pad 3 and the elastic pressure block 8, further improving the protective effect of the protective cover 7.

[0029] like Figure 1 and Figure 3 As shown, each skirt 9 has a fastening bolt 6 at its top, and the bottom of each fastening bolt 6 penetrates the corresponding skirt 9. The side of the outer casing 11 has symmetrically opened threaded holes 5. When the protective cover 7 covers the terminal 2, the fastening bolt 6 is aligned with the threaded hole 5, and the bottom of the fastening bolt 6 extends into the corresponding threaded hole 5 and is threadedly connected to the threaded hole 5. In actual use, after the protective cover 7 is placed on the terminal 2, the operator can tighten the fastening bolt 6 so that the bottom of the fastening bolt 6 is screwed into the corresponding threaded hole 5, thus fixing the protective cover 7 securely.

[0030] like Figure 1 and Figure 2 As shown, the outer casing 11 is also provided with connecting rings 10 on both sides. Each connecting ring 10 has several pairs of elastic clips 14 installed on its inner side. The elastic clips 14 are made of elastic metal material. Each pair of elastic clips 14 forms a slot. When the cable under test passes through the middle of the outer casing 11, the side of the cable under test is located in the slot. In actual use, when multiple cables under test are passed through the middle of the outer casing 11, the operator can move the side of the cable passing through the middle of the outer casing 11 into the corresponding slot. The elasticity of the elastic clips 14 will fix the cable in place. This will make the cable passing through the middle of the outer casing 11 close to the inner edge of the outer casing 11 and will not hinder the subsequent cables.

[0031] like Figure 1 As shown, each connecting ring 10 has several L-shaped fixing blocks 12 installed on the side near the outer shell 11, and several strip-shaped fixing blocks 13 are installed on the side of the outer shell 11. Each L-shaped fixing block 12 is fixed on the corresponding strip-shaped fixing block 13. By cooperating with the L-shaped fixing block 12 and the strip-shaped fixing block 13, and by fixing the L-shaped fixing block 12 and the strip-shaped fixing block 13 together with screws, the connecting ring 10 can be fixed on the outer shell 11 and fixed firmly.

[0032] Specifically, in use, the operator passes the cable to be tested through the middle of the outer casing 11, and the cable can be moved between the two corresponding elastic clips 14. The elastic clips 14 fix the cable to the inner edge of the outer casing 11, so as not to obstruct the subsequent cables from passing through the middle of the outer casing 11. Then, the other cables to be tested are passed through the outer casing 11 in sequence and fixed between the two corresponding elastic clips 14. Then, the current transformer is fixed in the preset installation position. Then, the operator connects the wires on the external equipment to the corresponding terminals 2, and the end of the wire near the terminal 2 will be located in the corresponding receiving groove 4. Then, the operator rotates the protective cover 7, and the protective cover 7 rotates along the connecting shaft 15. When the bottom of the protective cover 7 contacts the side of the outer casing 11, the terminal 2 is located in the protective cover 7. At the same time, the elastic pressure block 8 at the bottom of the skirt 9 will move into the receiving groove 4 to squeeze and seal the wire. Then, the operator passes the bottom of the fastening bolt 6 through the skirt 9 and screws it into the corresponding threaded hole 5 to fix the protective cover 7, which can isolate the terminal 2 from the external environment and improve the protection effect.

[0033] Furthermore, such as Figure 3 As shown, both ends of the connecting shaft 15 are connected to torsion springs 18. One end of each torsion spring 18 is fixed to the side of the strip connecting block 16, and the other end of each torsion spring 18 is fixed to the side of the corresponding mounting block 17. In actual use, the torsion force of the torsion spring 18 can keep the protective cover 7 away from the terminal 2, so that the protective cover 7 will not cause any obstruction to the staff during the wiring process.

[0034] Furthermore, sealing gaskets are provided at the bottom of the protective cover 7 and the bottom of the skirt 9. The sealing gaskets can be made of sealing rubber or other flexible materials with sealing properties. This can seal the gap between the bottom of the protective cover 7 and the skirt 9 and the side of the outer shell 11, further improving the protective effect of the protective cover 7.

[0035] Furthermore, such as Figure 1 As shown, a mounting base 1 is installed at the bottom of the outer casing 11. During installation, the operator can fix the mounting base 1 to the external part to be installed by screws, so that the outer casing 11 can be connected to the external equipment and the connection is stable.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A current transformer for high-voltage current measurement, comprising a housing (11), characterized in that: The housing (11) has a winding (19) inside, and several terminals (2) are installed on the side of the housing (11). One end of each terminal (2) is connected to the corresponding winding (19) through a wire, and the other end of the terminal (2) is connected to an external device through a wire. Two mounting blocks (17) are symmetrically mounted on the side of the housing (11) near the terminal (2). A connecting shaft (15) is rotatably connected between the two mounting blocks (17). A strip-shaped connecting block (16) is mounted on the side of the connecting shaft (15). One end of the strip-shaped connecting block (16) extends to one side of the mounting block (17), and a protective cover (7) is connected to this end of the strip-shaped connecting block (16). The protective cover (7) covers the terminal (2). The outer casing (11) has several receiving slots (4) on the side near the terminal (2). The wires connected to the terminal (2) are all located in the corresponding receiving slots (4). The protective cover (7) has skirts (9) extending on both sides. Each skirt (9) has several elastic blocks (8) installed at the bottom. When the protective cover (7) covers the terminal (2), the bottom of each elastic block (8) extends into the corresponding receiving slot (4) and presses on the surface of the wire. The outer casing (11) is also provided with connecting rings (10) on both sides. Each connecting ring (10) has several pairs of elastic clips (14) installed on its inner side. Each pair of elastic clips (14) forms a slot. When the cable under test passes through the middle of the outer casing (11), the side of the cable under test is located in the slot. Each connecting ring (10) has several L-shaped fixing blocks (12) installed on the side near the outer shell (11), and several strip-shaped fixing blocks (13) are installed on the side of the outer shell (11). Each L-shaped fixing block (12) is fixed on the corresponding strip-shaped fixing block (13).

2. A current transformer for high-voltage current measurement according to claim 1, characterized in that: Each receiving slot (4) has a rubber pad (3) installed on its inner surface, and the inner surface of the rubber pad (3) is sealed to the outer surface of the wire.

3. A current transformer for high-voltage current measurement according to claim 1, characterized in that: Each skirt (9) has a fastening bolt (6) at its top, and the bottom of each fastening bolt (6) passes through the corresponding skirt (9). The side of the outer casing (11) is symmetrically provided with threaded holes (5). When the protective cover (7) covers the terminal block (2), the fastening bolt (6) is aligned with the threaded hole (5), and the bottom of the fastening bolt (6) extends into the corresponding threaded hole (5) and is threadedly connected to the threaded hole (5).

4. A current transformer for high-voltage current measurement according to claim 1, characterized in that: Both ends of the connecting shaft (15) are connected to torsion springs (18). One end of each torsion spring (18) is fixed to the side of the strip connecting block (16), and the other end of each torsion spring (18) is fixed to the side of the corresponding mounting block (17).

5. A current transformer for high-voltage current measurement according to claim 1, characterized in that: Sealing gaskets are provided at the bottom of the protective cover (7) and the bottom of the skirt (9).

6. A current transformer for high-voltage current measurement according to claim 1, characterized in that: The elastic clip (14) is made of elastic metal material.

7. A current transformer for high-voltage current measurement according to claim 1, characterized in that: A mounting base (1) is installed on the bottom of the outer casing (11).

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