Large-current bushing and current-carrying structure thereof

Abstract

The utility model relates to a current-carrying structure, in particular to a large-current bushing and a current-carrying structure thereof. The structure comprises a central conduit, a watchband contact finger, an in-oil current-carrying terminal, an outdoor current-carrying terminal and an outdoor wiring board. The central conduit is used for being installed in a large-current sleeve core body. The inner ends of the in-oil current-carrying terminal and the outdoor current-carrying terminal are respectively inserted into the two ends of the inner hole of the central conduit, and the outer peripheral surfaces of the inner ends of the in-oil current-carrying terminal and the outdoor current-carrying terminal are respectively in elastic contact with the inner hole of the central conduit through corresponding watchband contact fingers; and one end of the outdoor wiring board is sleeved at the outer end of the outdoor current-carrying terminal. According to the utility model, a current-carrying structure with the watchband contact fingers is adopted, and the current-carrying hardware is in elastic contact with each other, so that an effective contact area can be ensured, the effective contact of the current-carrying hardware can be kept under the action of electrodynamic force in operation, and the current-carrying reliability of the large-current bushing is ensured.

Description

Technical Field

[0001] This utility model relates to a current-carrying structure, specifically to a high-current bushing and its current-carrying structure. Background Technology

[0002] High-current bushings generally refer to bushings with a rated current of 4kA to 8kA.

[0003] Currently, the current-carrying structure of high-current bushings generally adopts either threaded contact or planar contact current-carrying structure. These two structures have the following disadvantages:

[0004] 1. Threaded contact current carrying

[0005] 1.1 Due to manufacturing errors in thread processing, the thread contact is loose, and the effective fit between the internal and external threads is poor, causing heat to be generated at the thread and resulting in poor current carrying capacity;

[0006] 1.2 Due to manufacturing errors in thread processing, the thread contact is too tight, resulting in thread biting, making it impossible to disassemble for secondary assembly.

[0007] 2. Planar contact current carrying

[0008] 2.1 Plane contact current carrying requires high machining accuracy for the two current carrying surfaces. If the parallelism or flatness of the two planes is not good, the surface contact effect cannot be achieved, and line contact will form in some areas, affecting the current carrying effect.

[0009] 2.2 Due to insufficient planar contact, the current-carrying hardware cannot make effective contact under the action of electrodynamic force during operation, which poses a risk of separation.

[0010] With the rapid development of the power transmission and transformation industry, users have increasingly higher requirements for the safety, reliability and cost-effectiveness of product operation. Therefore, in view of the drawbacks of threaded contact current carrying or planar contact current carrying, there is an urgent need for a high current bushing current carrying structure that is reliable in carrying current and has a low manufacturing cost. Utility Model Content

[0011] The purpose of this invention is to solve the technical problems of poor current-carrying performance of existing threaded contact current-carrying bushings, inability to disassemble during secondary assembly, and insufficient tightness of planar contact current-carrying bushings affecting current-carrying performance, and to provide a high-current bushing and its current-carrying structure.

[0012] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0013] A current-carrying structure for a high-current bushing, characterized by:

[0014] This includes a central conduit, strap contacts, oil-based current-carrying terminals, outdoor current-carrying terminals, and outdoor junction boxes;

[0015] The central conduit is used for installation within the high-current bushing core;

[0016] The inner ends of the oil-carrying terminal and the outdoor current-carrying terminal are respectively inserted into the two ends of the inner hole of the central conduit, and the outer peripheral surfaces of the inner ends of the oil-carrying terminal and the outdoor current-carrying terminal are in elastic contact with the inner hole of the central conduit through the corresponding watch strap contact fingers.

[0017] One end of the outdoor terminal block is fitted onto the outer end of the outdoor current-carrying terminal.

[0018] Furthermore, the number of watch strap contacts is N, where N≥2; the N watch strap contacts are divided into two groups.

[0019] The inner outer circumferential surface of the oil-carrying terminal and the outdoor current-carrying terminal are respectively provided with a set of mounting ring grooves adapted to the watch strap fingers. Each set includes N / 2 mounting ring grooves evenly distributed along the axial direction, and there is an axial gap between two adjacent mounting ring grooves in the same set. The two sets of watch strap fingers are respectively installed in a set of mounting ring grooves on the inner outer circumferential surface of the oil-carrying terminal and the outdoor current-carrying terminal.

[0020] Furthermore, a stepped surface is provided between the inner end and the outer end of the oil-carrying terminal, and one end of the central conduit inserted into the oil-carrying terminal abuts against the stepped surface;

[0021] An annular step is provided in the middle of the outdoor current-carrying terminal, and the other end of the central conduit and one end of the outdoor terminal block abut against the inner and outer rings of the annular step, respectively.

[0022] Furthermore, the central catheter is made of copper, preferably T2 copper.

[0023] Meanwhile, this utility model also provides a high-current bushing, which is special in that it includes a core and the aforementioned current-carrying structure of a high-current bushing; the central conduit is installed in the inner hole of the core.

[0024] Furthermore, the core and the central conduit are coaxially arranged.

[0025] Furthermore, one end of the central conduit is connected to the current-carrying terminal in the oil, which is flush with the corresponding end of the core, while the other end extends out of the core.

[0026] The beneficial effects of the utility model are:

[0027] 1. This utility model adopts a current-carrying structure with watchband contact fingers. Each current-carrying hardware can maintain effective contact area through elastic contact with each other. Under the action of electrodynamic force during operation, the current-carrying hardware can also maintain effective contact, ensuring the reliability of high current bushing current carrying.

[0028] 2. Since threaded current carrying and planar current carrying require high machining accuracy for each current carrying hardware, the current carrying structure with watch strap contact fingers is adopted. As long as the central copper conduit, lower oil current carrying terminal, and upper outdoor current carrying terminal are made of materials of suitable size, the machining allowance is small, the manufacturing difficulty is low, and the manufacturing cycle is short. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment of a high-current bushing according to the present invention.

[0030] In the diagram: 1-Central conduit, 2-Strip contact finger, 3-Oil current-carrying terminal, 4-Outdoor current-carrying terminal, 5-Outdoor junction box; 6-Core. Detailed Implementation

[0031] To make the objectives, advantages, and features of this utility model clearer, the following detailed description of a high-current bushing and its current-carrying structure, in conjunction with the accompanying drawings and specific embodiments, will further clarify the advantages and features of this utility model. The advantages and features of this utility model will become clearer according to the following specific embodiments.

[0032] See Figure 1 This embodiment describes a current-carrying structure for a high-current bushing, which mainly includes a central conduit 1, a watch strap contact finger 2, an oil-based current-carrying terminal 3, an outdoor current-carrying terminal 4, and an outdoor terminal block 5.

[0033] Specifically, the central conduit 1 is a central copper conduit, and in this embodiment, it is more preferably T2 copper. The central conduit 1 is a hollow conduit and is coaxially installed inside the core 6 of the high-current bushing.

[0034] The inner outer circumferential surfaces of the oil-carrying terminal 3 and the outdoor current-carrying terminal 4 are each provided with a set of mounting ring grooves adapted to the watch strap contacts 2. The number of watch strap contacts 2 is N, where N≥2. If the number of watch strap contacts 2 is too small, for example, 2, the reliability of the elastic contact decreases. If the number is too large, for example, 20, although the reliability is high, the required installation space is large and the installation is cumbersome. In this embodiment, the value of N is 8 for illustration. Of course, in other embodiments of this utility model, the number of watch strap contacts 2 can be set according to actual needs.

[0035] The eight watch strap contacts 2 are divided into two groups, with four watch strap contacts 2 in each group; correspondingly, there are four mounting ring grooves in each group. The four in the same group are evenly distributed along the axial direction, and there is an axial gap between two adjacent mounting ring grooves in the same group; the two groups of watch strap contacts 2 are respectively installed in a set of mounting ring grooves on the outer circumference of the inner end of the oil current-carrying terminal 3 and the outdoor current-carrying terminal 4.

[0036] The inner ends of the oil-carrying terminal 3 and the outdoor current-carrying terminal 4 are respectively inserted into the two ends of the inner hole of the central conduit 1. The outer circumferential surfaces of the inner ends of the oil-carrying terminal 3 and the outdoor current-carrying terminal 4 respectively make elastic contact with the inner hole of the central conduit 1 through a corresponding set of watch strap fingers 2, so as to achieve overall effective current carrying.

[0037] Meanwhile, a stepped surface is provided between the inner end and the outer end of the oil current-carrying terminal 3. One end of the central conduit 1 inserted into the oil current-carrying terminal 3 abuts against the stepped surface, and the end of the central conduit 1 inserted into the oil current-carrying terminal 3 is flush with the corresponding end of the core 6.

[0038] One end of the outdoor terminal block 5 is fitted onto the outer end of the outdoor current-carrying terminal 4. An annular step is provided in the middle of the outdoor current-carrying terminal 4. The other end of the central conduit 1 and one end of the outdoor terminal block 5 respectively abut against the inner and outer rings of the annular step, and the other end of the central conduit 1 extends out of the core 6.

[0039] As mentioned above, the current-carrying structure provided in this embodiment is mainly applied to high-current bushings. Therefore, based on the aforementioned current-carrying structure of a high-current bushing, combined with the core 6 of an existing high-current bushing, a high-current bushing can also be manufactured.

Claims

1. A current-carrying structure for a high-current bushing, characterized in that: Includes a central conduit (1), a watch strap contact finger (2), an oil-based current-carrying terminal (3), an outdoor current-carrying terminal (4), and an outdoor junction box (5); The central conduit (1) is used to be installed inside the high-current bushing core (6); The inner ends of the oil-carrying terminal (3) and the outdoor current-carrying terminal (4) are respectively inserted into the two ends of the inner hole of the central conduit (1), and the outer peripheral surfaces of the inner ends of the oil-carrying terminal (3) and the outdoor current-carrying terminal (4) are in elastic contact with the inner hole of the central conduit (1) through the corresponding watch strap fingers (2). One end of the outdoor terminal block (5) is fitted onto the outer end of the outdoor current-carrying terminal (4).

2. The current-carrying structure of a high-current bushing according to claim 1, characterized in that: The number of the watch strap fingers (2) is N, where N≥2; the N watch strap fingers (2) are divided into two groups; The inner outer circumferential surfaces of the oil-carrying terminal (3) and the outdoor current-carrying terminal (4) are respectively provided with a set of mounting ring grooves adapted to the watch strap fingers (2). Each set includes N / 2 mounting ring grooves evenly distributed along the axial direction, and there is an axial gap between two adjacent mounting ring grooves in the same set. The two sets of watch strap fingers (2) are respectively installed in a set of mounting ring grooves at the inner end of the oil-carrying terminal (3) and the outdoor current-carrying terminal (4).

3. The current-carrying structure of a high-current bushing according to claim 2, characterized in that: The value of N is 8.

4. The current-carrying structure of a high-current bushing according to any one of claims 1-3, characterized in that: A stepped surface is provided between the inner end and the outer end of the oil current-carrying terminal (3), and one end of the central conduit (1) inserted into the oil current-carrying terminal (3) abuts against the stepped surface; An annular step is provided in the middle of the outdoor current-carrying terminal (4), and the other end of the central conduit (1) and one end of the outdoor terminal block (5) abut against the inner and outer rings of the annular step, respectively.

5. The current-carrying structure of a high-current bushing according to claim 1, characterized in that: The central conduit (1) is made of copper.

6. The current-carrying structure of a high-current bushing according to claim 5, characterized in that: The central catheter (1) is made of T2 copper.

7. A high-current bushing, characterized in that: Includes a core (6) and a current-carrying structure of a high-current bushing as described in any one of claims 1-6; The central conduit (1) is installed in the inner hole of the core (6).

8. A high-current bushing according to claim 7, characterized in that: The core (6) is coaxially arranged with the central conduit (1).

9. A high-current bushing according to claim 7 or 8, characterized in that: The central conduit (1) is connected to the oil current-carrying terminal (3) at one end, which is flush with the corresponding end of the core (6), and the other end extends out of the core (6).

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