35kv cold contraction type cable outdoor terminal

Abstract

The utility model discloses a 35kv cold shrink type cable outdoor terminal, which comprises an insulating tube, the insulating tube is integrally formed by multiple layers of silicon rubber, a stress cone is tightly attached to the inner wall of the insulating tube close to the bottom, and a cable body penetrates through the inner wall of the insulating tube. And the outer part of the cable body and the inner wall of the insulating tube are tightly wrapped. According to the utility model, the terminal is formed by liquid silicone rubber injection multilayer composite integral molding, so that the product quality is improved, and the design of the number, distribution and angle of the external large and small insulation umbrella skirts enhances the anti-pollution, anti-ice, anti-creepage and hydrophobic performance, and the service life of the terminal is prolonged. Therefore, the cable is suitable for various environmental conditions such as high-altitude areas, cold areas, humid areas, salt-fog areas and heavily-polluted areas, and meanwhile, the stress cone, the inner diameter surplus, the expansion proportion and the insulation creepage distance are optimized to be matched with 35kv cables, and the design of electric field distribution is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of cable applications, and particularly to a 35kV cold-shrinkable cable outdoor terminal. Background Art

[0002] In the process of 35kV power transmission, transformation and distribution, the 35kV cold-shrinkable outdoor terminal is applicable to the ends of outdoor overhead lines and indoor high-voltage busbar incoming lines. It is a cable accessory integrating a stress cone, umbrella skirts and insulation. A semi-conductive silicone rubber stress cone is compounded inside the accessory insulation to improve the electric field distribution at the cable cut-off point, thereby playing a certain shielding role in the connection of the cable end.

[0003] Although the existing 35kV cold-shrinkable outdoor terminals are widely used, they are limited to being used in lightly polluted areas with an altitude below 1500 meters and cannot be used in areas with high altitude, cold, heavy pollution, etc. Therefore, the utility model provides a 35kV cold-shrinkable cable outdoor terminal. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a 35kV cold-shrinkable cable outdoor terminal, which is made by injecting liquid silicone rubber in multiple layers and integrally molding, thereby improving the product quality. And through the design of the number, distribution and angle of the external large and small insulation umbrella skirts, the anti-pollution, anti-icing, anti-tracking and hydrophobic properties are enhanced, making it applicable to various environmental conditions such as high altitude areas, cold areas, humid areas, salt spray areas and heavy pollution areas. At the same time, the design of the stress cone, inner diameter surplus, expansion ratio, insulation creepage distance in cooperation with the 35kV cable and the electric field distribution is optimized.

[0005] To solve the above technical problem, a technical solution adopted by the utility model is: to provide a 35kV cold-shrinkable cable outdoor terminal, including an insulating tube, the insulating tube is integrally formed by multi-layer silicone rubber, a stress cone is closely attached to the inner wall of the insulating tube near the bottom position, a cable body is penetrated through the inner wall of the insulating tube, and the outer part of the cable body is closely wrapped with the inner wall of the insulating tube;

[0006] Four large insulation umbrella skirts and two small insulation umbrella skirts are circumferentially arranged on the outer wall of the insulating tube, three matching umbrella skirts are evenly fixedly connected to the outer wall of the insulating tube near the bottom inclined surface, and convex rings are circumferentially arranged at the positions near the top and bottom of the outer wall of the insulating tube.

[0007] The utility model is further arranged as: the outer wall extension heights of the three matching umbrella skirts are all on the same vertical line as the outer walls of the multiple large insulation umbrella skirts, and the matching umbrella skirt at the bottom of the inclined surface of the insulating tube is on the same horizontal plane as the top of the stress cone.

[0008] Through the above technical solution, during the energized use of the cable body, the electric field distribution formed inside it can be evenly distributed, and the creepage distance will not be interfered, enabling the entire outdoor terminal to operate stably.

[0009] The present utility model is further configured such that: the stress cone is arranged with an opening expanding from bottom to top, and its top is provided with an arc-shaped end. A bending connection portion is arranged near the middle position on the inner wall of the stress cone, and the connection position with the internal cable body is arranged with a slope of 45 degrees.

[0010] Through the above technical solution, after the cable body penetrates through the insulating tube, the contact portion between it and the stress cone can be stably and limit-connected and fixed by using the internal 45-degree bending connection portion, improving the stability and shielding performance during use.

[0011] The present utility model is further configured such that: the four large insulating umbrella skirts are divided into two groups for installation, and are arranged at equal intervals with the two small insulating umbrella skirts on the outer wall of the insulating tube.

[0012] Through the above technical solution, the different distribution settings of the large insulating umbrella skirts and the small insulating umbrella skirts enable the entire insulating tube to optimize the electric field distribution during use.

[0013] The present utility model is further configured such that: there are three protruding rings near the top position on the outer wall of the insulating tube, and a single protruding ring at its bottom.

[0014] Through the above technical solution, after the internal cable body passes through the installation, the sealing performance of the port can be enhanced.

[0015] The present utility model is further configured such that: the total radial value from the large insulating umbrella skirt at the uppermost part on the outer wall of the insulating tube to the matching umbrella skirt at the lowermost part is N, the total radial value of the vertical distance of the exposed outer wall of the insulating tube from the protruding ring (104) to the large insulating umbrella skirt at the lowermost part is M, and the creepage distance is Q = M + N, satisfying Q ≧ 55 mm / kV × Um.

[0016] Through the above technical solution, the electric field distribution during use can be optimized, and the product surplus, expansion ratio, and storage validity period are all optimized and designed.

[0017] The present utility model is further configured such that: the upper end surfaces of the four large insulating umbrella skirts, the two small insulating umbrella skirts, and the three matching umbrella skirts are all inclined, and the included angle with the outer wall of the insulating tube is greater than 90 degrees and less than 180 degrees, and the lower end surfaces are also all inclined, and the included angle with the outer wall of the insulating tube is greater than 0 degrees and less than 90 degrees.

[0018] Through the above technical solution, the four large insulating umbrella skirts, two small insulating umbrella skirts and three mating umbrella skirts on the insulating tube all incline downward, so that water deposition can be prevented during use, and a certain inclination angle can make the pollutants falling on the umbrella skirts slide off, thus keeping them clean.

[0019] The beneficial effects of the present utility model are as follows:

[0020] 1. A 35kv cold-shrinkable cable outdoor terminal proposed by the present utility model is made by injecting liquid silicone rubber and integrally forming multiple layers, thereby improving the product quality;

[0021] 2. A 35kv cold-shrinkable cable outdoor terminal proposed by the present utility model enhances the anti-pollution, anti-icing, anti-tracking and hydrophobic properties through the design of the number, distribution and angle of the large and small insulating umbrella skirts on the outside, making it applicable to various environmental conditions such as high altitude areas, cold areas, humid areas, salt fog areas and heavily polluted areas;

[0022] 3. A 35kv cold-shrinkable cable outdoor terminal proposed by the present utility model optimizes the design of the stress cone, inner diameter surplus, expansion ratio, insulation creepage distance in cooperation with the 35kv cable and the electric field distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a sectional view of a 35kv cold-shrinkable cable outdoor terminal of the present utility model;

[0024] Figure 2 is an installation schematic diagram of a 35kv cold-shrinkable cable outdoor terminal of the present utility model;

[0025] Figure 3 is a sectional view of the stress cone in a 35kv cold-shrinkable cable outdoor terminal of the present utility model.

[0026] In the figure: 100, insulating tube; 101, large insulating umbrella skirt; 102, small insulating umbrella skirt; 103, mating umbrella skirt; 104, raised ring; 200, stress cone; 201, arc end; 202, bent connection part; 300, cable body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0028] As Figures 1 - 3As shown in the figure, a 35kv cold-shrinkable cable outdoor terminal includes an insulating tube 100, which is integrally formed by multi-layer silicone rubber. A stress cone 200 is closely attached to the inner wall of the insulating tube 100 near the bottom. The stress cone 200 is arranged with an opening expanding from bottom to top, and its top is set as an arc end 201. A bending connection part 202 is arranged at the middle position of the inner wall of the stress cone 200, and the connection position with the internal cable body 300 is arranged with a slope of 45 degrees. After the cable body 300 penetrates through the insulating tube 100, the contact part between it and the stress cone 200 can be stably limited and connected and fixed by using the internal 45-degree bending connection part 202, so as to improve the stability and shielding performance during use. The cable body 300 penetrates through the inner wall of the insulating tube 100, and the outer part of the cable body 300 is closely wrapped with the inner wall of the insulating tube 100.

[0029] As Figure 1As shown in the figure, four large insulating umbrella skirts 101 and two small insulating umbrella skirts 102 are arranged on the outer wall circumference of the insulating tube 100. The four large insulating umbrella skirts 101 are divided into two groups and installed, and are evenly spaced from the two small insulating umbrella skirts 102 on the outer wall of the insulating tube 100. Such different distributions of the large insulating umbrella skirts 101 and the small insulating umbrella skirts 102 enable the entire insulating tube 100 to optimize the electric field distribution during use. Three mating umbrella skirts 103 are fixedly connected evenly near the bottom inclined surface of the outer wall of the insulating tube 100. The extension heights of the outer walls of the three mating umbrella skirts 103 are on the same vertical line as the outer walls of the multiple large insulating umbrella skirts 101, and the mating umbrella skirt 103 at the bottom of the inclined surface of the insulating tube 100 is on the same horizontal plane as the top of the stress cone 200. When the cable body 300 is energized, the electric field distribution formed inside it can be evenly distributed, and the creepage distance will not be disturbed, enabling the entire outdoor terminal to operate stably. The total radial value from the large insulating umbrella skirt 101 at the uppermost part of the outer wall of the insulating tube 100 to the lowermost mating umbrella skirt 103 is N. The total radial value of the exposed outer wall of the insulating tube 1 from the raised ring (104) to the lowermost large insulating umbrella skirt 101 is M, and the creepage distance is Q = M + N, satisfying Q≧55mm / kV×Um, which can optimize the electric field distribution during use and optimize the product surplus, expansion ratio, and storage validity period. The upper end faces of the four large insulating umbrella skirts 101, the two small insulating umbrella skirts 102, and the three mating umbrella skirts 103 are all inclined, and the included angle with the outer wall of the insulating tube 100 is greater than 90 degrees and less than 180 degrees, and the lower end faces are also inclined, and the included angle with the outer wall of the insulating tube 1 is greater than 0 degrees and less than 90 degrees, so that the four large insulating umbrella skirts 101, the two small insulating umbrella skirts 102, and the three mating umbrella skirts 103 on the insulating tube 100 all incline downward, thereby preventing water deposition during use, and a certain inclination angle can make the pollutants falling on the umbrella skirt slide off, thus keeping it clean. Raised rings 104 are arranged in a circular pattern near the top and bottom positions of the outer wall of the insulating tube 100. There are three raised rings 104 near the top position of the outer wall of the insulating tube 100, and a single raised ring 104 at the bottom, which can enhance the sealing performance of the port after the internal cable body 300 passes through and is installed.

[0030] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A 35kv cold shrink cable outdoor terminal, comprising an insulating tube (100), characterized in that: The insulating tube (100) is a multi-layer silicone rubber integrally formed arrangement, a stress cone (200) is tightly fitted on the inner wall of the insulating tube (100) near the bottom, a cable body (300) is penetrated through the inner wall of the insulating tube (100), and the outer portion of the cable body (300) is tightly wrapped with the inner wall of the insulating tube (100); The outer wall of the insulating tube (100) is provided with four large insulating sheds (101) and two small insulating sheds (102) on its circumference; the outer wall of the insulating tube (100) is evenly and fixedly connected with three matching sheds (103) near the bottom inclined surface; and the outer wall of the insulating tube (100) is provided with raised rings (104) on its circumference near the top and bottom.

2. A 35kv cold shrink cable outdoor terminal according to claim 1, characterized in that: The outer wall extension heights of the three matching sheds (103) are all on the same vertical line as the outer walls of the plurality of large insulating sheds (101), and the matching shed (103) at the bottom of the inclined surface of the insulating tube (100) and the top of the stress cone (200) are on the same horizontal plane.

3. A 35kv cold shrink cable outdoor terminal according to claim 1, characterized in that: The stress cone (200) is arranged to be open and expand from bottom to top, and its top is arranged as an arc-shaped end (201). A bent connection portion (202) is arranged near the middle of the inner wall of the stress cone (200), and is connected to the internal cable body (300) at a 45-degree slope.

4. A 35kv cold shrink cable outdoor terminal according to claim 1, characterized in that: The four large insulating sheds (101) are installed in two groups and are distributed alternately and equidistantly on the outer wall of the insulating tube (100) with the two small insulating sheds (102).

5. A 35kv cold shrink cable outdoor terminal according to claim 1, characterized in that: The outer wall of the insulating tube (100) is provided with three raised rings (104) near the top, and the bottom is provided with a single raised ring (104).

6. A 35kv cold shrink cable outdoor terminal according to claim 1, characterized in that: The sum of radial values ​​from the uppermost large insulating shed (101) located on the outer wall of the insulating tube (100) to the lowermost matching shed (103) is N, the sum of vertical distances of the insulating tube (100) exposed on the outer wall from the raised ring (104) to the lowermost large insulating shed (101) is M, and the creepage distance is Q=M+N, satisfying Q≧55mm / kV×Um.

7. A 35kv cold shrink cable outdoor terminal according to claim 1, characterized in that: The upper end surfaces of the four large insulating sheds (101), the two small insulating sheds (102) and the three matching sheds (103) are all inclined, and the angles between them and the outer wall of the insulating tube (100) are greater than 90 degrees and less than 180 degrees, and the lower end surfaces are also inclined, and the angles between them and the outer wall of the insulating tube (100) are greater than 0 degrees and less than 90 degrees.

Images