A scalable current transformer

Abstract

The application discloses a telescopic current transformer, which comprises a transformer main body, a fixing ring connected to the lower surface of the transformer main body, an inner limiting ring arranged in the transformer main body and fixed to the fixing ring, a rotating groove arranged on the upper surface of the fixing ring and the inner limiting ring, a lifting rod arranged on the upper surface of the second rotating ring in a symmetrical mode, a pushing block arranged at the top end of the lifting rod, a limiting frame fixed to the first rotating ring and arranged above the lifting rod, a push rod arranged on the outer side wall of the upper connecting rod and used for detachably connecting the upper connecting rod and the clamping plate, and a wave groove arranged on the inner wall of the inner limiting ring. The inner part of the transformer main body is provided with a clamping block, the clamping block is used for fixing a cable, the cable is always fixed at the center of the transformer main body, the cable is prevented from shaking, the cable is prevented from being abraded during use, various specifications of cables are better fixed, and the structure is simple and the operation is convenient.

Description

Technical Field

[0001] This invention relates to a scalable current transformer. Background Technology

[0002] To ensure the safe and economical operation of the power system, the operating status of cables must be monitored and measured. However, general measuring and protection devices cannot be directly connected to primary high-voltage equipment. Therefore, current transformers are needed to proportionally transform the large current of the primary system into a smaller current. Current transformers can proportionally transform high voltage or large current into standard low voltage (100V) or standard small current (5A or 10A, both referring to rated values) before supplying it to measuring instruments, etc., so as to achieve standardization and miniaturization of measuring instruments, protection equipment, and automatic control equipment. Current transformers can also be used to isolate high-voltage systems to ensure the safety of personnel and equipment.

[0003] Current transformers used in high-voltage transmission cables are generally installed in a ring shape around the cable. However, the installation accuracy of existing current transformers in engineering sites is generally not high, making it difficult to maintain a high degree of concentricity between the ring-shaped current transformer and the cable. There is usually a 10% eccentricity, or very complex high-precision installation fixtures are required to achieve a high degree of concentricity between the current transformer and the cable during installation. Furthermore, the diameter range of cables is very large, and the existing current transformers have low adaptability, unable to simultaneously adapt to a wide range of different cable diameters, and cannot perform stepless adjustment. Therefore, a retractable current transformer has emerged. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a scalable current transformer.

[0005] A retractable current transformer includes a transformer body. A fixing ring is attached to the lower surface of the transformer body. An inner limiting ring mounted on the fixing ring is provided inside the transformer body. Rotating grooves are formed on the upper surfaces of both the fixing ring and the inner limiting ring. A second rotating ring is embedded in the rotating groove of the fixing ring, and a first rotating ring is embedded in the rotating groove of the inner limiting ring. Lifting rods are symmetrically arranged on the upper surface of the second rotating rings. A pushing block is provided at the top of each lifting rod. A fixed block is provided above each lifting rod. The limiting frame on the first rotating ring is provided with a limiting through groove. The upper and lower surfaces of the limiting frame are respectively provided with an upper connecting rod and a lower connecting rod. The upper connecting rod and the lower connecting rod are connected by a connecting post that passes through the limiting through groove. The outer side wall of the upper connecting rod is detachably connected to the clamping plate by a push rod. The inner wall of the inner limiting ring is provided with a corrugated groove. The lifting rod is composed of a fixed rod and a movable rod installed inside the fixed rod. An adjusting rod is screwed onto the side wall of the movable rod, and the free end of the adjusting rod is engaged with the corrugated groove.

[0006] As a further improvement, the clamping plate is arc-shaped. The arc-shaped clamping plate can better adapt to the shape of the cable, and play a better role in wrapping and fixing the cable, ensuring that the cable remains in a consistent fixed position in the current transformer.

[0007] As a further improvement, the clamping plate and the push rod are connected by a screw connection, which facilitates maintenance, repair and replacement in daily use. At the same time, when encountering cables with special specifications, the corresponding clamping head can be replaced to ensure the clamping effect of the clamping head.

[0008] As a further improvement, the middle part of the limiting frame is a cavity structure, and the pushing block vertically penetrates the cavity structure. The lifting and lowering movement of the pushing block pushes the lower connecting rod, causing the clamping block to move inward, thereby better fitting the outer wall of the cable.

[0009] As a further improvement, the push rod is screwed to the upper connecting rod.

[0010] As a further improvement, the surfaces of the first and second rotating rings are each embedded with multiple rotating grooves. By pulling the rotating grooves, the operator can drive the first and second rotating rings to rotate, thereby driving the push block to move up and down.

[0011] As a further improvement, the cross-sectional shape of the push block is a right triangle, and the corners of the right triangle push block are all rounded.

[0012] As a further improvement, the inclined surface of the right-angled triangular push block abuts against the lower connecting rod, and the clamping plate pushes inward as the limiting block rises, reducing the distance between the clamping blocks, thereby clamping smaller cables.

[0013] Beneficial effects:

[0014] The device has a clamping block inside the transformer body to fix the cable and ensure that the cable is always fixed in the center of the transformer body. This prevents the cable from shaking and wear during use, and better fixes cables of various specifications. The structure is simple and the operation is convenient.

[0015] The distance between the two clamping blocks in this device can be adjusted according to the thickness of the cable, thereby adapting to the installation of cables of various diameters and improving the applicability and service life of the instrument transformer body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a current transformer;

[0017] Figure 2 This is a schematic diagram of the internal structure of a current transformer;

[0018] Figure 3 This is a top view of the current transformer.

[0019] Figure 4 This is a side view of the three-dimensional structure of a current transformer;

[0020] 1. Current transformer body 2. Inner limiting ring 3. Clamping plate 4. Push block 5. Fixing ring 6. Limiting frame 7. Rotating groove 8. Lifting rod 9. Corrugated groove 10. Upper connecting rod 11. Push rod 12. Second rotating ring 13. First rotating ring. Detailed Implementation

[0021] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0022] like Figures 1-4 As shown in a specific embodiment of the present invention, a retractable current transformer includes a transformer body 1, an inner limiting ring 2, a clamping plate 3, a pushing block 4, a fixing ring 5, a limiting frame 6, a rotating groove 7, a lifting rod 8, a corrugated groove 9, an upper connecting rod 10, a push rod 11, a second rotating ring 12, and a first rotating ring 13.

[0023] A retractable current transformer includes a transformer body 1. A fixing ring 5 is attached to the lower surface of the transformer body 1. An inner limiting ring 2, mounted on the fixing ring 5, is located inside the transformer body 1. Rotating grooves 7 are formed on the upper surfaces of both the fixing ring 5 and the inner limiting ring 2. A second rotating ring 12 is embedded in the rotating groove 7 of the fixing ring 5, and a first rotating ring 13 is embedded in the rotating groove 7 of the inner limiting ring 2. Lifting rods 8 are symmetrically arranged on the upper surface of the second rotating ring 12. A pushing block 4 is provided at the top of each lifting rod 8. A fixed... A limiting frame 6 is fixed on the first rotating ring 13. Each limiting frame 6 is provided with a limiting through groove. The upper and lower surfaces of the limiting frame 6 are respectively provided with an upper connecting rod 10 and a lower connecting rod. The upper connecting rod 10 and the lower connecting rod are connected by a connecting post that passes through the limiting through groove. The outer side wall of the upper connecting rod 10 is detachably connected to the clamping plate 3 through a push rod 11. The inner wall of the inner limiting ring 2 is provided with a corrugated groove 9. The lifting rod 8 is composed of a fixed rod and a movable rod installed inside the fixed rod. An adjusting rod is screwed onto the side wall of the movable rod. The free end of the adjusting rod is engaged with the corrugated groove 9.

[0024] The clamping plate 3 is arc-shaped, which can better adapt to the shape of the cable and play a better role in wrapping and fixing the cable, ensuring that the cable remains in the same fixed position in the current transformer.

[0025] The clamping plate 3 and the push rod 11 are connected by a screw connection, which facilitates maintenance, inspection and replacement in daily use. At the same time, when encountering cables with special specifications, the corresponding clamping head can be replaced to ensure the clamping effect of the clamping head.

[0026] The middle part of the limiting frame 6 is a cavity structure. The pushing block 4 vertically penetrates the cavity structure. The lifting and lowering movement of the pushing block 4 pushes the lower connecting rod, causing the clamping block to move inward, thereby better fitting the outer wall of the cable.

[0027] Push rod 11 is screwed to upper connecting rod 10.

[0028] The surfaces of the first rotating ring 13 and the second rotating ring 12 are each embedded with multiple rotating grooves. By pulling the rotating grooves, the operator can drive the first rotating ring 13 and the second rotating ring 12 to rotate, thereby driving the push block 4 to move up and down.

[0029] The cross-sectional shape of push block 4 is a right triangle, and the corners of the right triangle push block 4 are all rounded.

[0030] The inclined surface of the right-angled triangular push block 4 abuts against the lower connecting rod. As the limit block rises, the clamping plate 3 pushes inward, reducing the distance between the clamping blocks, thereby clamping the smaller cable.

[0031] In use, the operator pulls the rotating buckle groove, causing the first and second rotating rings to rotate within the rotating groove. During rotation, the first rotating ring drives the lifting rod to rise or fall. The working principle is as follows: the rotation of the first rotating ring causes the adjusting rod to move within the corrugated groove. Due to the special design of the corrugated groove, the pushing block rises or falls. During the rise, the pushing block abuts against the lower connecting rod and pushes the lower connecting rod to move inward. The upper and lower connecting rods are linked, and the clamping plate is connected to the upper connecting rod. Therefore, the clamping plate moves in the direction of movement of the lower connecting rod, ultimately clamping and fixing the cable.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0033] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A scalable current transformer, characterized by, The utility model relates to a kind of transformer, including transformer main body, the lower surface of the transformer main body is connected with fixed ring, the inside of transformer main body is equipped with the inner limiting ring installed on fixed ring, the upper surface of the fixed ring and inner limiting ring is all set with rotary recess, the rotary recess in the fixed ring is embedded with second rotating ring, the rotary recess in the inner limiting ring is embedded with first rotating ring, the upper surface of the second rotating ring is symmetrically equipped with lifting rod, the top of lifting rod is all equipped with push block, the upper of lifting rod is all equipped with the limiting frame fixed on first rotating ring, limiting frame is all equipped with limiting through slot, the upper surface and the lower surface of limiting frame are respectively equipped with upper connecting rod and lower connecting rod, the upper connecting rod and lower connecting rod are all connected by the connecting column that passes through limiting through slot, the outer side wall of upper connecting rod is detachably connected with clamping plate by push rod, the inner wall of inner limiting ring is equipped with a circle of bellows recess, the lifting rod is composed of fixed rod and movable rod installed in fixed rod interior, the lateral wall of movable rod is screw-jointed with adjusting rod, the free end of adjusting rod is engaged with bellows recess; The middle part of the limiting frame is a hollow structure, and the push block vertically penetrates the hollow structure. The cross-sectional shape of the push block is a right triangle, and the corners of the right triangle push block are all chamfered. The inclined surface of the right triangle push block abuts against the lower connecting rod.

2. A scalable current transformer according to claim 1, characterized in that, The shape of the clamping plate is arc-shaped.

3. A scalable current transformer according to claim 1, characterized in that, The clamping plate and the push rod are connected by screwing.

4. A scalable current transformer according to claim 1, characterized in that, The push rod is connected with the upper connecting rod by screwing.

5. A scalable current transformer according to claim 1, wherein, The surfaces of the first rotating ring and the second rotating ring are embedded with a plurality of rotating buckle grooves.

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