Bushing type current transformer

Abstract

The utility model discloses a bushing type current transformer which comprises a current transformer body, the upper surface of the current transformer body is fixedly connected with a shell, the shell is provided with eight sliding grooves, the inner surfaces of the eight sliding grooves are connected with sliding blocks in a sliding mode, the upper surfaces of the sliding blocks are fixedly connected with lower bearing blocks, and the lower bearing blocks are fixedly connected with lower bearing blocks. The upper surfaces of the eight lower bearing blocks are fixedly connected with upper bearing blocks, a pull rod is slidably connected between every two lower bearing blocks and every two upper bearing blocks in a penetrating mode, through the components, the eight clamping plates clamp inwards at the same time, and compared with a traditional double-clamping-plate clamping mode, eight-point-position clamping can provide more comprehensive and more balanced supporting force; the mutual inductor and the wire are connected more stably, the mutual inductor is effectively prevented from sliding or shifting on the surface of the wire, pressure borne by all parts of the wire is balanced, and the situation that the wire is deformed due to the fact that local pressure is too high is avoided.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, and in particular to a bushing-type current transformer. Background Technology

[0002] The existing bushing-type current transformer is a type of current transformer that is directly mounted on an insulated bushing or an insulated conductor. Bushing-type current transformers use high-quality silicon steel sheets with high permeability to make magnetic rings, which have high measurement accuracy and low instrument safety factor. They are generally suitable for current measurement, metering and protection of power system distribution lines, transformers and electrical equipment.

[0003] However, when used, traditional bushing-type current transformers are fixed to the conductor using a double-clamping method. The double clamping provides two-point clamping, resulting in fewer fixing points on the conductor surface. This makes it difficult to securely constrain the transformer from multiple angles. During power system operation, when the conductor is subjected to external forces such as strong winds or mechanical vibrations, the transformer is more likely to slide or shift on the conductor surface. Furthermore, when the double clamping holds the conductor, the pressure is mainly concentrated in the two areas where the clamping is in contact with the conductor, which can easily cause excessive local pressure on the conductor and lead to conductor deformation. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a bushing-type current transformer. By rotating the screw, the connecting block can be driven to move the pull rod. Since the eight lower bearing blocks and the eight upper bearing blocks are connected to each other through the pull rod, and with the limiting effect of the sliding groove, the eight clamping plates will clamp inward at the same time. Compared with the traditional double-clamping method, the eight-point clamping can provide more comprehensive and balanced support force, making the connection between the transformer and the conductor more stable, effectively preventing the transformer from sliding or shifting on the surface of the conductor, and the pressure on each part of the conductor is more balanced, so that the conductor will not be deformed due to excessive local pressure.

[0005] This utility model also provides a bushing-type current transformer as described above, comprising: a current transformer body, an outer shell fixedly connected to the upper surface of the current transformer body, eight sliding grooves provided on the outer shell, sliders slidably connected to the inner surfaces of the eight sliding grooves, lower bearing blocks fixedly connected to the upper surfaces of the sliders, upper bearing blocks fixedly connected to the upper surfaces of the eight lower bearing blocks, a pull rod slidably connected between every two lower bearing blocks and every two upper bearing blocks, two fixing plates fixedly connected to the inner surface of the outer shell, the two fixing plates being arranged opposite to each other, screws rotatably connected to the side surfaces of the two fixing plates, connecting blocks fixedly connected to the outer walls of any two pull rods, the two screws being threadedly connected to the two pull rods respectively, connecting blocks I fixedly connected to the side surfaces of the eight lower bearing blocks, elastic support components fixedly connected to the side surfaces of the eight connecting blocks I, connecting blocks II fixedly connected to the other ends of the eight elastic support components, and clamping plates fixedly connected to the side surfaces of the eight connecting blocks II, the clamping plates being arc-shaped.

[0006] According to the present invention, a bushing-type current transformer is provided, wherein a limiting plate is fixedly connected to the inner surface of the housing, and the limiting plate is movably connected to the connecting block.

[0007] According to the present invention, a bushing-type current transformer is provided, wherein the screw is connected to the limiting plate through the screw and extends to the outer surface of the housing.

[0008] According to the present invention, a bushing-type current transformer is provided, wherein a knob is fixedly connected to the other end of the screw, and a protective sleeve is fixedly connected to the outer surface of the knob.

[0009] According to the present invention, a bushing-type current transformer is provided, wherein a sliding rod is fixedly connected to the inner surface of the sliding groove, and the slider is slidably connected to the outer wall of the sliding rod.

[0010] According to the present invention, a bushing-type current transformer is provided in which anti-slip pads are fixedly connected to the inner surfaces of the eight clamping plates.

[0011] According to the present invention, a bushing-type current transformer is provided, wherein the elastic support assembly includes a spring and a damper, and the spring and the damper are fixedly connected between connecting block one and connecting block two.

[0012] Compared with existing technologies, this bushing-type current transformer can move the connecting block by rotating the screw, and since the eight lower bearing blocks and eight upper bearing blocks are connected to each other through the connecting rod, plus the limiting effect of the sliding groove, the eight clamping plates will clamp inward simultaneously. Compared with the traditional double-clamping method, the eight-point clamping can provide more comprehensive and balanced support force, making the connection between the transformer and the conductor more stable, effectively preventing the transformer from sliding or shifting on the conductor surface, and the pressure on each part of the conductor is more balanced, so that the conductor will not be deformed due to excessive local pressure. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a front view of the bushing-type current transformer of this utility model;

[0015] Figure 2 This is a left-side cross-sectional view of the bushing-type current transformer of this utility model;

[0016] Figure 3 This is a right-side cross-sectional view of the bushing-type current transformer of this utility model;

[0017] Figure 4 This is a top view of the bushing-type current transformer of this utility model.

[0018] Legend:

[0019] 1. Sheath; 2. Knob; 3. Anti-slip pad; 4. Housing; 5. Current transformer body; 6. Fixing plate; 7. Connecting block; 8. Limiting plate; 9. Screw; 10. Connecting block two; 11. Spring; 12. Damper; 13. Upper bearing block; 14. Connecting block one; 15. Lower bearing block; 16. Clamping plate; 17. Slide groove; 18. Slide rod; 19. Slider; 20. Pull rod. Detailed Implementation

[0020] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0021] Reference Figure 1-4This utility model discloses a bushing-type current transformer, comprising: a current transformer body 5, specifically a current transformer that operates based on the principle of electromagnetic induction. When current flows through a conductor, a magnetic field is generated around the conductor. The windings of the current transformer body 5 sense this magnetic field and generate an induced electromotive force and an induced current in the windings. By measuring and processing the induced current, the magnitude of the current in the conductor can be indirectly measured. A housing 4 is fixedly connected to the upper surface of the current transformer body 5. Eight sliding grooves 17 are provided on the housing 4. Sliding blocks 19 are slidably connected to the inner surfaces of the eight sliding grooves 17. Sliding rods 18 are fixedly connected to the inner surfaces of the sliding grooves 17. The sliding blocks 19 are slidably connected to the outer wall of the sliding rods 18. A lower bearing block 15 is fixedly connected to the upper surface of the sliding blocks 19. Upper support blocks 13 are fixedly connected to the upper surface of each lower support block 15. A pull rod 20 is slidably connected between every two lower support blocks 15 and every two upper support blocks 13. Two fixing plates 6 are fixedly connected to the inner surface of the outer shell 4, and the two fixing plates 6 are arranged opposite to each other. A screw 9 is rotatably connected to the side surface of each of the two fixing plates 6. A limit plate 8 is fixedly connected to the inner surface of the outer shell 4. The limit plate 8 is movably connected to a connecting block 7. The screw 9 is slidably connected to the limit plate 8 and extends to the outer surface of the outer shell 4. A knob 2 is fixedly connected to the other end of the screw 9. A sleeve 1 is fixedly connected to the outer surface of the knob 2. A connecting block 7 is fixedly connected to the outer wall of any two pull rods 20. Two screws 9 are threadedly connected to two pull rods 20 respectively. Connecting blocks 14 are fixedly connected to the side surfaces of each of the eight lower support blocks 15.

[0022] Specifically: Rotating knob 2 causes the screw 9, which is fixedly connected to it, to rotate. Since screw 9 is rotatably connected to fixed plate 6 and passes through limiting plate 8, screw 9 can rotate stably under the support of fixed plate 6. Screw 9 is threadedly connected to connecting block 7. When screw 9 rotates, according to the principle of threaded transmission, connecting block 7 will move along the axial direction of screw 9. Because limiting plate 8 provides a movable connection and limit for connecting block 7, connecting block 7 can only move linearly along the axial direction of screw 9 and will not deviate in other directions. Connecting block drives the movement of pull rod and bearing block: Connecting block 7 is fixedly connected to pull rod 20, so the movement of connecting block 7 will drive the movement of pull rod 20. Pull rod 20 is slidably connected between lower bearing block 15 and upper bearing block 13. When pull rod 20 moves, it will simultaneously pull or push the eight lower bearing blocks 15 and the eight upper bearing blocks 13.

[0023] Each of the eight connecting blocks 14 has an elastic support assembly fixedly connected to its side surface. The elastic support assembly includes a spring 11 and a damper 12. The spring 11 and the damper 12 are fixedly connected between the connecting block 14 and the connecting block 2 10. Each of the eight elastic support assemblies has a connecting block 2 10 fixedly connected to its other end. Each of the eight connecting blocks 2 10 has a clamping plate 16 fixedly connected to its side surface. The clamping plate 16 is arc-shaped. Each of the eight clamping plates 16 has an anti-slip pad 3 fixedly connected to its inner surface.

[0024] Specifically: The lower support block 15 is slidably connected to the slide rod 18 in the slide groove 17 via the slider 19, which restricts the lower support block 15 to only move in a straight line along the direction of the slide groove 17. When the eight lower support blocks 15 move synchronously under the action of the pull rod 20, they will drive the eight clamping plates 16 connected by the elastic support assembly to move synchronously inward or outward. When moving inward, the eight clamping plates 16 will clamp and fix the wire located in the center, realizing the stable fixation of multiple clamping points; otherwise, they will be released. An elastic support assembly composed of a spring 11 and a damper 12 is set between the connecting block 14 and the connecting block 20. When the clamping plate 16 contacts the wire under the action of the support block, if the wire diameter does not completely match the initial position of the clamping plate 16, the spring 11 and the damper 12 can adapt to the wire diameter through their own elastic deformation, providing a certain buffering and self-adaptive capability.

[0025] Working principle: In use, the current transformer body 5 is sleeved on the outside of the conductor. Rotating the knob 2 causes the eight clamping plates 16 to move inward simultaneously under the action of the pull rod 20, the lower bearing block 15, and the upper bearing block 13 until the anti-slip pads 3 on the inner surface of the clamping plates 16 are in close contact with the surface of the conductor, firmly clamping the conductor. During the clamping process, the springs 11 and dampers 12 in the elastic support assembly will automatically adjust according to the diameter and shape of the conductor, so that the clamping plates 16 better fit the surface of the conductor, ensuring the stability and reliability of the clamping, thereby completing the installation and putting the current transformer body 5 into normal use.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A bushing-type current transformer, characterized in that, include: The current transformer body (5) has a housing (4) fixedly connected to its upper surface. The housing (4) has eight sliding grooves (17). The inner surfaces of the eight sliding grooves (17) are slidably connected to sliders (19). The upper surfaces of the sliders (19) are fixedly connected to lower bearing blocks (15). The upper surfaces of the eight lower bearing blocks (15) are fixedly connected to upper bearing blocks (13). A pull rod (20) is slidably connected between every two lower bearing blocks (15) and every two upper bearing blocks (13). The inner surface of the housing (4) is fixedly connected to two fixing plates (6). The two fixing plates (6) are arranged opposite to each other. The side surfaces of the two fixing plates (6) are rotatably connected to screws (9). A connecting block (7) is fixedly connected to the outer wall of any two pull rods (20), and the two screws (9) are threadedly connected to the two pull rods (20) respectively. Connecting block one (14) is fixedly connected to the side surface of each of the eight lower bearing blocks (15). Elastic support components are fixedly connected to the side surface of each of the eight connecting blocks one (14). Connecting block two (10) is fixedly connected to the other end of each of the eight elastic support components. Clamping plate (16) is fixedly connected to the side surface of each of the eight connecting blocks two (10). The clamping plate (16) is arc-shaped.

2. A bushing-type current transformer according to claim 1, characterized in that, A limiting plate (8) is fixedly connected to the inner surface of the outer shell (4), and the limiting plate (8) is movably connected to the connecting block (7).

3. A bushing-type current transformer according to claim 2, characterized in that, The screw (9) is connected through the limiting plate (8), and the screw (9) extends through to the outer surface of the outer shell (4).

4. A bushing-type current transformer according to claim 3, characterized in that, A knob (2) is fixedly connected to the other end of the screw (9), and a protective sleeve (1) is fixedly connected to the outer surface of the knob (2).

5. A bushing-type current transformer according to claim 1, characterized in that, The inner surface of the groove (17) is fixedly connected to a slide rod (18), and the slider (19) is slidably connected to the outer wall of the slide rod (18).

6. A bushing-type current transformer according to claim 1, characterized in that, The inner surfaces of the eight clamps (16) are all fixedly connected with anti-slip pads (3).

7. A bushing-type current transformer according to claim 1, characterized in that, The elastic support assembly includes a spring (11) and a damper (12), both of which are fixedly connected between connecting block one (14) and connecting block two (10).

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