Shielding cylinder applied to clean air current transformer

Abstract

The utility model relates to a shielding cylinder applied to a clean air current transformer, and belongs to the field of transformer equipment. According to the technical scheme, the shielding cylinder applied to the clean air current transformer comprises a cylinder body and a cylinder cover, a connecting assembly is arranged between the cylinder body and the cylinder cover, the connecting assembly is located in the shielding cylinder, and the two ends of the connecting assembly are connected with the inner sides of the edges of the cylinder body and the cylinder cover respectively. The beneficial effects of the scheme are that the connecting assembly between the cylinder body and the cylinder cover of the shielding cylinder is located in the shielding cylinder, so that an outward protruding structure is eliminated, and the phenomenon of point discharge is inhibited to a great extent.

Description

Technical Field

[0001] The utility model relates to the field of transformer equipment, in particular to a shielding cylinder used for a clean air current transformer. Background Art

[0002] At present, shielding tubes are widely used in high-voltage and low-voltage electrical equipment. Their function is to uniformly distribute the electric field on the surface of the conductor, reduce tip discharge under high voltage, reduce the amount of local discharge generated during electrical operation, and reduce the probability of electrical insulation breakdown under high voltage.

[0003] However, the current mainstream insulating tube structure has the following problems: 1. Most shielding tube structures have sharp points on their surfaces, especially at the connection between the tube body and the tube cover. Because the two need to be firmly connected, and a direct bolt connection solution similar to a flange structure is generally adopted, it is inevitable that protrusions that affect the smoothness of the surface will be produced, such as nuts, connecting blocks, etc.

[0004] When the shielding tube is used under mainstream insulating media such as SF6 gas and insulating oil, it can meet the technical standards. However, when using clean air or other lower insulating media as the insulating medium, these two problems will lead to an increase in the local tip discharge of the shielding tube, affecting the stable operation of the product. Summary of the Invention

[0005] The utility model aims to solve the problem that the current shielding tube structure has an external protruding structure and is prone to tip discharge when clean air is used as the insulating medium. The utility model provides a shielding tube with a smoother exterior for use in clean air current transformers.

[0006] To address the aforementioned issues, the present invention employs a technical solution: a shielding tube for a clean air current transformer, comprising a body and a cover. A connecting assembly is disposed between the body and cover, located within the shielding tube. The connecting assembly's ends connect to the inner edges of the body and cover, respectively. This internal connection eliminates the external protrusion and significantly reduces tip discharge.

[0007] Preferably, the connecting assembly includes a connecting plate, one side of which is in contact with and fixedly connected to the inner side surfaces of the cylinder body and the cylinder cover.

[0008] Preferably, a first countersunk hole is provided at the edge of the barrel body, with the large diameter end of the first countersunk hole located on the outside of the barrel body; a second countersunk hole is provided at the edge of the barrel cover, with the large diameter end of the second countersunk hole located on the outside of the barrel cover; two threaded holes are provided on the connecting plate, with set screws respectively installed in the threaded holes, and the bolt heads of the two set screws are respectively located in the first countersunk hole and the second countersunk hole. The screws are buried in the countersunk holes to avoid protrusion.

[0009] Preferably, the large-diameter ends of the first countersunk hole and the second countersunk hole are first truncated cone-shaped, the bolt head of the set screw is second truncated cone-shaped, and the taper of the first truncated cone is no greater than that of the second truncated cone. This eliminates sharp gaps on the exterior of the shielding tube and improves fastening capability through tapered surface fit.

[0010] Preferably, the taper of the first frustum is equal to the taper of the second frustum, and the height of the first frustum is equal to the height of the second frustum, so that the outer wall of the shielding tube is smoother.

[0011] Preferably, the outer sides of the cylinder body and cylinder cover are coated with electromagnetic shielding paint, which improves the shielding effect and covers small defects on the surface of the shielding cylinder, further reducing the amount of partial discharge.

[0012] Preferably, the connection components are provided in multiple groups, and the multiple groups of connection components are evenly distributed in the circumferential direction of the shielding cylinder.

[0013] It can be seen from the above technical solutions that the advantages of the present invention are: the shielding tube adopts a new connection structure of the tube body and the tube cover, which effectively reduces the tip discharge of the shielding tube; the outer wall of the shielding tube is sprayed with electromagnetic shielding paint, which improves the shielding effect and covers the small defects on the surface of the shielding tube, further reducing the amount of local discharge; this solution greatly suppresses the problems of local discharge and insulation, so that the shielding tube can be used in clean air current transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a structural diagram of a specific implementation method of the utility model.

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0017] Description of main reference numerals

[0018] 1. Cylinder body, 2. Cylinder cover, 3. Connecting plate, 4. Set screw. DETAILED DESCRIPTION

[0019] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0020] like Figure 1 As shown, a shielding cylinder used for a clean air current transformer includes a cylinder body 1 and a cylinder cover 2. A plurality of connecting components are provided between the cylinder body 1 and the cylinder cover 2. The connecting components are located inside the shielding cylinder. The plurality of connecting components are evenly distributed in the circumferential direction of the shielding cylinder. The two ends of the connecting components are respectively connected to the inner sides of the edges of the cylinder body 1 and the cylinder cover 2.

[0021] like Figure 2 As shown, the connecting assembly includes a connecting plate 3, one side of which is abutted against the inner side surfaces of the cylinder body 1 and the cylinder cover 2 and fixedly connected. Specifically, a first countersunk hole is provided at the edge of the cylinder body 1, and the large diameter end of the first countersunk hole is located on the outside of the cylinder body 1. A second countersunk hole is provided at the edge of the cylinder cover 2, and the large diameter end of the second countersunk hole is located on the outside of the cylinder cover 2. Two threaded holes are provided on the connecting plate 3, and set screws are respectively installed in the threaded holes. The bolt heads of the two set screws are respectively located in the first countersunk hole and the second countersunk hole. The large diameter ends of the first countersunk hole and the second countersunk hole are first frustum-shaped, and the bolt heads of the set screws are second frustum-shaped. The taper of the first frustum is not greater than the taper of the second frustum, so that there are no sharp gaps on the outer surface of the shielding cylinder. In this embodiment, the taper of the first frustum is equal to the taper of the second frustum, and the height of the first frustum is equal to the height of the second frustum.

[0022] The outer sides of the cylinder body 1 and the cylinder cover 2 are also coated with electromagnetic shielding paint, which further improves the shielding effect of the shielding cylinder and eliminates tiny pits and burrs on the surface of the shielding cylinder, further suppressing the tip discharge phenomenon.

[0023] It can be seen from the above implementation methods that the beneficial effect of the utility model is that the shielding tube adopts a new connection structure of the tube body and the tube cover, which effectively reduces the tip discharge of the shielding tube; the outer wall of the shielding tube is sprayed with electromagnetic shielding paint, which improves the shielding effect and covers the small defects on the surface of the shielding tube, further reducing the amount of local discharge; this solution greatly suppresses the problems of local discharge and insulation, so that the shielding tube can be used in clean air current transformers.

[0024] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shielding cylinder for clean air current transformer, comprising a cylinder body and a cylinder cover, characterized in that: A connecting component is provided between the cylinder body and the cylinder cover. The connecting component is located inside the shielding cylinder, and two ends of the connecting component are respectively connected to the inner sides of the edges of the cylinder body and the cylinder cover.

2. The shielding tube for clean air current transformer according to claim 1, characterized in that: The connecting assembly comprises a connecting plate, one side of which is pressed against the inner side surfaces of the cylinder body and the cylinder cover and fixedly connected.

3. The shielding tube for clean air current transformer according to claim 2, characterized in that: A first countersunk hole is provided at the edge of the cylinder body, and the large diameter end of the first countersunk hole is located on the outside of the cylinder body. A second countersunk hole is provided at the edge of the cylinder cover, and the large diameter end of the second countersunk hole is located on the outside of the cylinder cover. Two threaded holes are provided on the connecting plate, and set screws are respectively installed in the threaded holes. The bolt heads of the two set screws are respectively located in the first countersunk hole and the second countersunk hole.

4. The shielding tube for clean air current transformer according to claim 3, characterized in that: The large diameter ends of the first countersunk hole and the second countersunk hole are in a first frustum shape, the bolt head of the set screw is in a second frustum shape, and the taper of the first frustum shape is not greater than that of the second frustum shape.

5. The shielding tube for clean air current transformer according to claim 4, characterized in that: The taper of the first frustum is equal to the taper of the second frustum, and the height of the first frustum is equal to the height of the second frustum.

6. A shielding tube for a clean air current transformer according to any one of claims 1 to 5, characterized in that: The outer sides of the cylinder body and the cylinder cover are coated with electromagnetic shielding paint.

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