A small current ground fault detection device

Abstract

The utility model discloses a small current grounding fault detection device relates to grounding fault detection device technical field, including detection main part, the detection main part is connected with side cover, be equipped with wiring terminal and the passageway of wiring terminal sliding wear on the side cover, the lateral wall of passageway is equipped with horizontal strip hole, the side of wiring terminal is equipped with the guide column of inlaying strip hole, the outside of side cover is equipped with lock plate and the sliding slot of lock plate transverse sliding, be connected with elastic member between the inner end of lock plate and sliding slot inner end, the front side edge of wiring terminal is equipped with the positioning slot of cooperation with lock plate, the wiring terminal of the utility model discloses can slide telescopic in the passageway of side cover, when extending the passageway, can hide in passageway and reduce wiring part to receive the interference of outside foreign matter and reduce false touch, strip hole restricts the sliding stroke of wiring terminal through guide column, and lock plate can make wiring terminal in stable state in hidden state.

Description

Technical Field

[0001] This utility model relates to the technical field of grounding fault detection devices, and in particular to a low-current grounding fault detection device. Background Technology

[0002] Low-current grounding systems are widely used in distribution networks, especially 3-66kV medium-voltage distribution networks. Their core characteristic is that the fault current is relatively small when a single phase is grounded, typically ranging from a few amps to tens of amps. Low-current grounding fault detection is a core technology for distribution network operation and maintenance, and its core lies in locating the fault by extracting differentiated electrical characteristics (steady-state or transient) of the faulty line. In practical applications, appropriate detection devices must be selected based on the distribution network's grounding method and fault type. For example, patent CN216052011U describes a fault detection device for distribution network terminals, which possesses multiple low-current grounding fault detection functions, enhancing the fault detection capability of distribution network terminals while reducing the size of the fault detection device. This device also features standardized terminals, improving adaptability and compatibility for upgrading and retrofitting older distribution network equipment; however, the standardized terminals expose the conductive locking screws, and since most detection scenarios are outdoors, the exposed terminals cannot effectively reduce the risk of accidental contact, and interference from impurities and foreign objects can easily lead to faults and detection errors. Utility Model Content

[0003] The purpose of this invention is to provide a low-current grounding fault detection device in order to solve at least one of the problems in the prior art mentioned above.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A low-current grounding fault detection device includes a detection body; the detection body is connected to a side cover, the side cover is provided with a terminal block and a channel for the terminal block to slide through, the side wall of the channel is provided with a horizontal strip hole, the side of the terminal block is provided with a guide post extending into the strip hole, the outer side of the side cover is provided with a locking plate and a sliding groove for the locking plate to slide laterally, an elastic element is connected between the inner end of the locking plate and the inner end of the sliding groove, and the front edge of the terminal block is provided with a positioning groove that cooperates with the locking plate.

[0005] Furthermore, a rectangular tube is provided on the inner side of the side cover, and a through hole corresponding to the inner side of the rectangular tube is provided on the side cover. The inner side of the rectangular tube and the through hole form a channel for the wiring terminal to slide through.

[0006] Furthermore, the elastic element is a V-shaped elastic rod; each locking plate connects two elastic elements, and the V-shaped openings of the two elastic elements face each other.

[0007] Furthermore, the terminal block has several wiring cavities inside, and the outer wall of the terminal block has a through hole communicating with the wiring cavity. The wiring cavity has a wire pressing conductive plate, and the wire pressing conductive plate is electrically connected to the internal components of the detection body.

[0008] Furthermore, the inner wall of the terminal block is provided with an inner hole, and the inner end of the wire-pressing conductive plate is connected to an extension that passes through the inner hole, and the extension is connected to a flexible cable.

[0009] Furthermore, the wire-pressing conductive plate slides vertically up and down inside the wiring cavity, and a fixing pad is provided on the upper wall of the wiring cavity.

[0010] Furthermore, the upper wall of the terminal block and the fixing pad are provided with corresponding vertical holes, and the wire pressing conductive plate is threaded with a stud, which is hinged to the wire pressing handle through the vertical hole.

[0011] Furthermore, the inner end of the wire pressing handle is hinged to the upper end of the stud, and a protrusion is provided on the lower side of the inner end of the wire pressing handle.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: The terminal block of this invention can slide and extend within the channel of the side cover. When it extends out of the channel, it can be used for connecting and disconnecting wires. It can be hidden in the channel to reduce interference from external foreign objects and reduce accidental contact. The strip hole limits the sliding stroke of the terminal block through the guide post, and the locking plate can keep the hidden terminal block in a stable state. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the external structure of this utility model.

[0014] Figure 2 This is an exploded view of the present invention.

[0015] Figure 3 This is a side view of the strip hole and guide post of this utility model.

[0016] Figure 4 This is a side view of the present invention.

[0017] Figure 5 This is a schematic diagram of the lock plate connection of this utility model.

[0018] Figure 6 This is a schematic diagram of the terminal block structure of this utility model.

[0019] Figure 7 This is a schematic diagram of the internal structure of the wiring terminal of this utility model.

[0020] In the diagram: 1. Detection body; 2. Side cover; 3. Wiring terminal; 4. Rectangular tube; 5. Strip hole; 6. Guide post; 7. Locking plate; 8. Slide groove; 9. Elastic element; 10. Positioning groove; 11. Wiring cavity; 12. Wire hole; 13. Wire pressing conductive plate; 14. Fixing pad; 15. Inner hole; 16. Extension; 17. Flexible cable; 18. Stud; 19. Vertical hole; 20. Wire pressing handle; 21. Protrusion. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] Specific embodiments of the low-current grounding fault detection device provided by this utility model: Please see Figures 1-7 A low-current grounding fault detection device includes a detection body 1. The detection body 1 has an opening on its side that communicates with the interior, and a side cover 2 that closes the opening. A bolt passes through the end of the side cover 2, and a threaded hole is provided inside the opening of the detection body 1 for threaded connection with the bolt, so that the side cover 2 can be disassembled.

[0023] The side cover 2 is provided with a terminal block 3 and a channel for the terminal block 3 to slide through. The inner side of the side cover 2 is provided with a rectangular tube 4, which is perpendicularly connected to the side cover 2. The side cover 2 is provided with a through hole corresponding to the inner side of the rectangular tube 4. The rectangular tube 4 and the inner side of the through hole form the aforementioned channel for the terminal block 3 to slide through. The terminal block 3 slides and extends within the channel, realizing the extension and concealment of the front part of the terminal block 3.

[0024] The channel sidewall has two horizontal strip-shaped holes 5 on the rectangular tube 4, symmetrically arranged on both sides of the rectangular tube 4. Guide posts 6 are provided on both sides of the inner end of the terminal block 3. The guide posts 6 are perpendicularly connected to the terminal block 3, and their sliding direction is perpendicular to that of the terminal block 3. Two guide posts 6 are symmetrically arranged on both sides of the terminal block 3, and each guide post 6 extends into the strip-shaped hole 5 on the same side. During the sliding extension and retraction of the terminal block 3, the outer and inner ends of the strip-shaped holes 5 respectively limit the terminal block 3 in its fully extended and retracted states.

[0025] To ensure the stability of the concealed terminal 3, a locking plate 7 and a sliding groove 8 for the locking plate 7 to slide laterally are provided on the outer side of the side cover 2. The sliding groove 8 is U-shaped, with the U-shaped opening facing the terminal 3 laterally. The cross-section of the sliding groove 8 is L-shaped and it is fastened to the outer side of the side cover 2. The edge of the locking plate 7 slides along the inner side of the sliding groove 8. There are two sets of locking plates 7 and sliding grooves 8, symmetrically arranged on both sides of the terminal 3.

[0026] The front side of the locking plate 7 has anti-slip textures for easy finger pushing. An elastic element 9 connects the inner end of the locking plate 7 to the inner end of the slide groove 8. Two positioning grooves 10 are provided on the front edge of the terminal block 3 to mate with the locking plate 7. The elastic element 9 is a V-shaped elastic rod; each locking plate 7 connects to two elastic elements 9, with the V-shaped openings of the two elastic elements 9 facing each other.

[0027] The elastic element 9 causes the locking plate 7 to extend along the slide groove 8, with its end extending into the positioning groove 10 on the front edge of the terminal 3, preventing the terminal 3 from extending out of the channel. When the locking plate 7 is driven to compress the elastic element 9, forcing the elastic element 9 to deform, the locking plate 7 exits the positioning groove 10 and no longer blocks the terminal 3, allowing the terminal 3 to be pulled out. After the terminal 3 is pushed into the channel and hidden, the locking plate 7 can automatically pop out into the positioning groove 10 under the action of the elastic element 9, thus locking the terminal 3 in the hidden state.

[0028] The terminal block 3 has a row of several wiring cavities 11 evenly arranged inside. The outer wall of the terminal block 3 has through holes 12 communicating with the wiring cavities 11, with each through hole 12 corresponding to one of the wiring cavities 11. A wire-pressing conductive plate 13 is provided inside each wiring cavity 11. The conductive plate 13 is attached to the inner side of the wiring cavity 11 and slides vertically up and down within the wiring cavity 11. A fixing pad 14 is provided on the upper wall of the wiring cavity 11. The main body of the terminal block 3 is made of rigid plastic, while the conductive plate 13 and the fixing pad 14 are made of metal.

[0029] The pressure wire conductive plate 13 is electrically connected to the internal components of the detection body 1; the inner wall of the terminal 3 is provided with an inner hole 15, and the inner end of the pressure wire conductive plate 13 is connected to an extension 16 that passes through the inner hole 15. The inner hole 15 allows the extension 16 to move vertically up and down. The extension 16 is connected to a flexible cable 17, which is connected to the internal components of the detection body 1. During the sliding extension and retraction of the terminal 3, the flexible cable 17 can adaptably deform.

[0030] The upper wall of the terminal block 3 and the fixing pad 14 are provided with corresponding vertical holes 19. The wire pressing conductive plate 13 is threaded with a stud 18. The wire pressing conductive plate 13 is provided with a threaded through hole that mates with the stud 18. The stud 18 passes through the vertical hole 19 and has a gap with the inner wall of the vertical hole 19. The upper end of the stud 18 is hinged with a wire pressing handle 20, which is made of hard plastic.

[0031] The inner end of the wire clamping handle 20 is hinged to the upper end of the stud 18, and a protrusion 21 is provided on the lower side of the inner end of the wire clamping handle 20. By directly flipping the wire clamping handle 20, when the non-protrusion 21 of the wire clamping handle 20 contacts the upper wall of the terminal 3, the wire clamping conductive plate 13 descends, and there is a large gap between the wire clamping conductive plate 13 and the fixing pad 14. The external cable head is inserted into the wiring cavity 11, and the wire clamping handle 20 is flipped so that the protrusion 21 of the wire clamping handle 20 contacts the upper wall of the terminal 3, thereby causing the stud 18 and the wire clamping conductive plate 13 to rise, clamping the external cable head under the fixing pad 14, thus achieving quick wiring.

[0032] It can adapt to external cables of different diameters. By raising the wire clamping handle 20 and rotating the wire clamping handle 20, the stud 18 is rotated. The wire clamping conductive plate 13 cannot rotate in the wiring cavity 11. The rotation of the stud 18 causes the wire clamping conductive plate 13 to rise and fall vertically, changing the initial distance between the wire clamping conductive plate 13 and the fixed pad 14, thereby adapting to the wiring of different external cables and ensuring stable connection.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-current grounding fault detection device, comprising a detection body (1); characterized in that, The detection body (1) is connected to a side cover (2). The side cover (2) is provided with a terminal block (3) and a channel through which the terminal block (3) slides. The side wall of the channel is provided with a horizontal strip hole (5). The side of the terminal block (3) is provided with a guide post (6) that extends into the strip hole (5). The side of the side cover (2) is provided with a locking plate (7) and a sliding groove (8) for the locking plate (7) to slide laterally. An elastic element (9) is connected between the inner end of the locking plate (7) and the inner end of the sliding groove (8). The front edge of the terminal block (3) is provided with a positioning groove (10) that cooperates with the locking plate (7).

2. The low-current grounding fault detection device according to claim 1, characterized in that, The side cover (2) has a rectangular tube (4) on its inner side, and the side cover (2) has a through hole corresponding to the inner side of the rectangular tube (4). The rectangular tube (4) and the inner side of the through hole form a channel for the terminal (3) to slide through.

3. The low-current grounding fault detection device according to claim 1 or 2, characterized in that, The elastic element (9) is a V-shaped elastic rod; each of the locking plates (7) connects two elastic elements (9), and the V-shaped openings of the two elastic elements (9) are opposite each other.

4. The low-current grounding fault detection device according to claim 1, characterized in that, The terminal block (3) is provided with several wiring cavities (11) inside. The outer wall of the terminal block (3) is provided with a wire hole (12) communicating with the wiring cavity (11). The wiring cavity (11) is provided with a wire pressing conductive plate (13). The wire pressing conductive plate (13) is electrically connected to the internal components of the detection body (1).

5. The low-current grounding fault detection device according to claim 4, characterized in that, The inner wall of the terminal block (3) is provided with an inner hole (15), and the inner end of the wire-pressing conductive plate (13) is connected to an extension (16) that passes through the inner hole (15), and the extension (16) is connected to a flexible cable (17).

6. The low-current grounding fault detection device according to claim 4, characterized in that, The pressure wire conductive plate (13) slides vertically up and down inside the wiring cavity (11), and a fixing pad (14) is provided on the upper wall of the wiring cavity (11).

7. The low-current grounding fault detection device according to claim 6, characterized in that, The upper wall of the terminal block (3) and the fixing pad (14) are provided with corresponding vertical holes (19). The wire pressing conductive plate (13) is threaded with a stud (18). The stud (18) passes upward through the vertical hole (19) and is hinged to a wire pressing handle (20).

8. The low-current grounding fault detection device according to claim 7, characterized in that, The inner end of the wire pressing handle (20) is hinged to the upper end of the stud (18), and a protrusion (21) is provided on the lower side of the inner end of the wire pressing handle (20).

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