Cable terminal metal inner sheath grounding device

Abstract

The utility model relates to a cable terminal metal inner sheath grounding device, which comprises a terminal body and a high-voltage cable body, a tail pipe is arranged at the tail of the terminal body, a grounding terminal is arranged on the tail pipe, a ground wire is connected onto the grounding terminal, a metal inner sheath is arranged on the high-voltage cable body, a conductor is arranged on the metal inner sheath, and the conductor is connected with the high-voltage cable body. The conductor is connected with the grounding terminal and has a certain expansion and contraction amount, the metal inner sheath and the tail pipe are welded and sealed through the lead seal, the conductor connected with the grounding terminal is arranged on the metal inner sheath, and the conductor has a certain expansion and contraction amount, so that when the sealing lead is broken or falls off due to sinking and pulling of a foundation of the high-voltage cable body, the sealing lead is sealed. The metal inner sheath can also be connected with a ground wire through a conductor, and suspension voltage generated by grounding failure in the metal inner sheath is guided into the ground through the ground wire, so that breakdown of the terminal body is avoided.

Description

Technical Field

[0001] This utility model relates to the field of cable terminal technology, and specifically to a grounding device for the metal inner sheath of a cable terminal. Background Technology

[0002] A cable termination is a device installed at the end of a cable to ensure electrical connection to other parts of the system and maintain insulation up to the connection point. Its main function is to connect cable lines to other electrical equipment, ensuring stable electrical and mechanical performance. After cable laying, the cable termination locks and secures the incoming and outgoing lines, and also provides waterproofing, dustproofing, and vibration damping.

[0003] Currently, the grounding of the inner metal sheath of high-voltage cables is generally achieved by connecting the lead seal to the tail pipe and then grounding through the tail pipe terminal. This grounding method can cause the lead seal to break or fall off due to cable foundation subsidence and pulling, resulting in a floating voltage in the inner metal sheath of the cable and severe overheating, ultimately leading to cable terminal breakdown. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a grounding device for the metal inner sheath of a cable terminal.

[0005] The purpose of this utility model can be achieved through the following technical solution: a grounding device for a cable terminal metal inner sheath, including a terminal body and a high-voltage cable body, a tail tube at the tail of the terminal body, a grounding terminal on the tail tube, a ground wire connected to the grounding terminal, a metal inner sheath on the high-voltage cable body, a conductor on the metal inner sheath, the conductor being connected to the grounding terminal with a certain amount of expansion and contraction, and the metal inner sheath and the tail tube being sealed by lead seal welding.

[0006] Preferably, the lead seal is covered with an insulator.

[0007] Preferably, the insulator is heat shrink tubing or waterproof tape.

[0008] Preferably, the conductor is a cable or copper braided tape.

[0009] Preferably, the inner metal sheath is provided with terminals, and the conductor is connected to the terminals by bolts.

[0010] Preferably, the conductor is fixed to the metal inner sheath by copper wire or stainless steel compression spring.

[0011] The beneficial effects of this utility model are as follows: By setting a conductor connected to the grounding terminal on the metal inner sheath, and leaving a certain amount of expansion and contraction in the conductor, when the lead seal breaks or falls off due to the sinking or pulling of the foundation of the high-voltage cable body, the metal inner sheath can still be connected to the ground wire through the conductor. The floating voltage generated in the metal inner sheath due to grounding failure is conducted to the ground through the ground wire, thereby avoiding the breakdown of the terminal body. Attached Figure Description

[0012] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a grounding device for a cable terminal metal inner sheath according to the present invention.

[0014] Figure 2 This is another structural schematic diagram of a grounding device for a cable terminal metal inner sheath according to the present invention.

[0015] The labels in the diagram represent: 1. Terminal body; 101. Tail tube; 2. High-voltage cable body; 201. Metal inner sheath; 3. Grounding terminal; 301. Ground wire; 4. Conductor; 5. Lead seal; 6. Wiring terminal. Detailed Implementation

[0016] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0017] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0018] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Example 1:

[0020] See Figures 1 to 2 As shown, the structure of this utility model is as follows: a cable terminal metal inner sheath grounding device, including a terminal body 1 and a high-voltage cable body 2. The terminal body 1 has a tail tube 101 at its tail end, and a grounding terminal 3 is provided on the tail tube 101. A ground wire 301 is connected to the grounding terminal 3. The terminal body 1 is connected to the ground through the ground wire 301, ensuring that the potential difference between the high-voltage cable body 2 and the ground approaches zero. Thus, in the event of an external fault or short circuit in the high-voltage cable body 2, the fault current flows back to the ground through the ground wire 301, protecting personal safety. The high-voltage cable body 2 is provided with a metal inner sheath 201, which wraps a metal shell around the outside of the cable, providing additional support and protection for the cable and playing a physical protection role, preventing the cable from being subjected to mechanical impact, pressure, water, dust, and other external factors. Despite environmental damage and various extreme environments, the metal inner sheath 201 ensures the long-term stable operation of the cable, preventing power accidents. It also serves as electromagnetic shielding, reducing the impact of external electromagnetic interference on the cable. The metal inner sheath 201 and the tail tube 101 are sealed by lead seal 5, ensuring the sealing and waterproof performance of the terminal body 1 and the high-voltage cable body 2, while achieving good grounding. The metal inner sheath 201 is equipped with a conductor 4, which is a cable or copper braided tape. The conductor 4 is connected to the grounding terminal 3 and has a certain amount of expansion and contraction. When the lead seal breaks or falls off due to the foundation sinking or pulling of the high-voltage cable body 2, the conductor 4 can conduct the floating voltage generated by the grounding failure of the metal inner sheath 201 to the ground through the ground wire 301, thereby preventing the terminal body 1 from breaking down.

[0021] Furthermore, the lead seal 5 is covered with an insulator, which is heat shrink tubing or waterproof tape. The insulator can prevent short circuits and leakage in the cable, improve the safety of the equipment, and prevent water, dust and other impurities from entering the connection, thus protecting the safety and reliability of the electrical equipment.

[0022] like Figure 1 As shown, the inner metal sheath 201 is provided with a terminal block 6, which is welded and fixed to the inner metal sheath 201. The conductor 4 is connected to the terminal block 6 by bolts. Connecting lugs are crimped onto both ends of the conductor 4, and then bolts are used to connect both ends of the conductor 4 to the terminal block 6 and the grounding terminal 3 respectively, thus making the connection of the conductor 4 more secure.

[0023] Example 2:

[0024] The difference between this embodiment and Embodiment 1 is that: Figure 2 As shown, one end of conductor 4 is fixed to the metal inner sheath 201 by copper wire or stainless steel compression spring, the other end of conductor 4 is crimped with a lug, and then connected to the terminal 6 by bolts, with a certain amount of expansion and contraction allowed to make the connection of conductor 4 more convenient and quick.

[0025] In practical use, a conductor 4 is installed on the metal inner sheath 201, and then the conductor 4 is connected to the grounding terminal 3, with a certain amount of expansion and contraction. When the lead seal breaks or falls off due to the sinking or pulling of the foundation of the high-voltage cable body 2, the metal inner sheath 201 can still be connected to the ground wire 301 through the conductor 4, thereby preventing the floating voltage generated by the metal inner sheath 201 due to grounding failure from breaking down the terminal body 1.

[0026] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A grounding device for the metal inner sheath of a cable terminal, characterized in that: The device includes a terminal body (1) and a high-voltage cable body (2). The terminal body (1) has a tail tube (101) at its tail end. The tail tube (101) has a grounding terminal (3) and a ground wire (301) is connected to the grounding terminal (3). The high-voltage cable body (2) has a metal inner sheath (201) and a conductor (4) on the metal inner sheath (201). The conductor (4) is connected to the grounding terminal (3) and has a certain amount of expansion and contraction. The metal inner sheath (201) and the tail tube (101) are sealed by welding with a lead seal (5).

2. The grounding device for the metal inner sheath of a cable terminal according to claim 1, characterized in that: The lead seal (5) is covered with an insulator.

3. The grounding device for the metal inner sheath of a cable terminal according to claim 2, characterized in that: The insulator is heat shrink tubing or waterproof tape.

4. The grounding device for the metal inner sheath of a cable terminal according to claim 1, characterized in that: The conductor (4) is a cable or copper braided tape.

5. A grounding device for the metal inner sheath of a cable terminal according to claim 1, characterized in that: The metal inner sheath (201) is provided with a terminal block (6), and the conductor (4) is connected to the terminal block (6) by bolts.

6. A grounding device for the metal inner sheath of a cable terminal according to claim 1, characterized in that: The conductor (4) is fixed to the metal inner sheath (201) by copper wire or stainless steel compression spring.

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