A DC resistance test cable junction box

Abstract

This invention discloses a DC resistance test cable junction box, comprising a box body, three measuring posts penetrating the side of the box body, three lead posts penetrating the side of the box body, a fixing plate fixed inside the box body, three measuring end conductive blocks mounted on the fixing plate, and three insulating posts rotatably mounted inside the box body via a rotating shaft, three conductive posts fixed on the insulating posts, and lead-in end conductive blocks fixed to the side of the conductive posts. One end of the rotating shaft penetrates the box body and is fixed with a handwheel. This invention offers convenient measurement, simple operation, high efficiency, and flexible use.

Description

Technical Field

[0001] This invention relates to the field of transformer testing technology, and in particular to a DC resistance test cable junction box. Background Technology

[0002] DC resistance measurement of transformers is a crucial component of transformer factory testing, installation, commissioning testing, and preventative equipment testing. It effectively detects manufacturing defects such as material selection, welding, and loose connections in transformer coils, as well as potential hazards after operation. Therefore, DC resistance measurement is an essential part of preventative testing conducted by power companies. In practice, measurements must be taken between two phases at each tap. However, current DC resistance testers on the market only offer two outputs. After measurement, workers must climb back onto the transformer to replace and reconnect cables. For large transformers with multiple taps, cable replacement increases working time and power outage time, and also raises the risk of workers falling while climbing the transformer. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a DC resistance test cable junction box.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A DC resistance test cable junction box includes a box body, three measuring posts passing through the side of the box body, three lead posts passing through the side of the box body, a fixing plate fixed inside the box body, three measuring end conductive blocks mounted on the fixing plate, three insulating posts rotatably mounted inside the box body via a rotating shaft, three conductive posts fixed on the insulating posts, and lead-in end conductive blocks fixed to the side of the conductive posts, and a handwheel fixed at one end of the rotating shaft passing through the box body.

[0006] Furthermore, a protective cover is hinged to the side of the housing, and the protective cover covers the outside of the three measuring columns.

[0007] Furthermore, a sliding groove is provided on the side of the housing, and two threaded grooves are provided in the sliding groove. A baffle is slidably installed in the sliding groove, and a locking bolt passes through the side of the baffle. The locking bolt is threadedly connected to the threaded groove, and the baffle covers the outside of the lead post.

[0008] Furthermore, a sliding rod is slidably passed through the fixed plate, a mounting plate is fixed to the bottom end of the sliding rod, the measuring end conductive block is fixed to the mounting plate, and a nut is threaded onto the sliding rod.

[0009] Furthermore, a first spring is sleeved on the slide rod, the first spring being located between the mounting plate and the fixing plate, and the nut being located above the fixing plate.

[0010] Furthermore, the bottom of the measuring end conductive block is a concave arc shape, and the top of the input end conductive block is a convex arc shape.

[0011] Furthermore, a positioning mechanism is installed on the side of the box body. The positioning mechanism includes a sleeve, a telescopic rod, a positioning ball, and a second spring. The sleeve is fixed to the inner wall of the box body. The telescopic rod is slidably connected to the inside of the sleeve through the second spring. A positioning ball is fixed to one end of the telescopic rod. The handwheel is provided with three positioning holes.

[0012] Furthermore, a pointer is fixed to the side of the rotating shaft, and a ring-shaped dial is fixed to the side of the housing.

[0013] Furthermore, the measuring post and the measuring end conductive block are connected by a first wire, and the lead post and the conductive post are connected by a second wire.

[0014] Furthermore, a handle is installed on the top of the box, and wheels are installed on the bottom of the box.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. In this invention, the three lead posts are connected to the three measurement ports of the transformer via cables. Since the measurement ports of the transformer are directly introduced, all wiring can be completed sequentially. When changing the measurement position, it is not necessary to climb again, making the operation more convenient and improving the efficiency, safety and convenience of measurement.

[0017] 2. In this invention, since three measuring columns are also provided, one measurement can be achieved between any two measuring columns, resulting in three measurement modes. By rotating the handwheel, the rotating shaft can be driven to rotate, which in turn drives the insulating column to rotate, and the insulating column drives the conductive column to rotate. This results in three possible conduction states between the three measuring end conductive blocks and the three lead-in end conductive blocks. Moreover, the three conduction states are mutually interlocked, meaning that no two or three conduction states will occur simultaneously, and there will be no mutual interference during measurement. By observing the pointer, it is easy to determine which conduction state it is in. The conduction state can be positioned by inserting the positioning ball into the positioning hole on the handwheel, thus preventing it from falling off.

[0018] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained from the following description and the foregoing claims. Attached Figure Description

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of a DC resistance test cable junction box proposed in this invention;

[0021] Figure 2 This is a schematic diagram of the arrangement structure of the conductive block at the inlet end of a DC resistance test cable junction box proposed in this invention.

[0022] Figure 3 This is a schematic diagram of the mounting structure of the components on the fixing plate of a DC resistance test cable junction box proposed in this invention;

[0023] Figure 4 This is a schematic diagram of the conductive block at the inlet end of a DC resistance test cable junction box proposed in this invention.

[0024] Figure 5 This is a schematic diagram of the measuring end conductive block of a DC resistance test cable junction box proposed in this invention;

[0025] Figure 6 This is a partial structural diagram of position A of a DC resistance test cable junction box proposed in this invention;

[0026] Figure 7 This is a schematic diagram of the positioning mechanism of a DC resistance test cable junction box proposed in this invention.

[0027] In the diagram: 1. Housing, 2. First conductor, 3. Measuring column, 4. Protective cover, 5. Display screen, 6. Conductive column, 7. Insulating column, 8. Second conductor, 9. Fixing plate, 10. Baffle, 11. Lead-in column, 12. Locking bolt, 13. Lead-in end conductive block, 14. Measuring end conductive block, 15. Rotating shaft, 16. Dial, 17. Pointer, 18. Handwheel, 19. Positioning mechanism, 191. Sleeve, 192. Telescopic rod, 193. Positioning ball, 194. Second spring, 20. Slide rod, 21. Nut, 22. First spring, 23. Mounting plate. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In the description of this invention, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] like Figure 1-2 As shown, a DC resistance test cable junction box includes a box body 1. Three measuring posts 3 pass through the side of the box body 1. Three lead posts 11 pass through the side of the box body 1. A fixing plate 9 is fixed inside the box body 1. Three measuring end conductive blocks 14 are installed on the fixing plate 9. An insulating post 7 is rotatably installed inside the box body 1 via a rotating shaft 15. Three conductive posts 6 are fixed on the insulating post 7. A lead-in end conductive block 13 is fixed to the side of the conductive post 6. One end of the rotating shaft 15 passes through the box body 1 and is fixed with a handwheel 18.

[0033] A protective cover 4 is hinged to the side of the housing 1. The protective cover 4 covers the outside of the three measuring columns 3. A sliding groove is opened on the side of the housing 1. Two threaded grooves are provided in the sliding groove. A baffle 10 is slidably installed in the sliding groove. A locking bolt 12 passes through the side of the baffle 10. The locking bolt 12 is connected to the threaded groove by threads. The baffle 10 covers the outside of the lead post 11.

[0034] The measuring column 3 is connected to the measuring end conductive block 14 by the first wire 2, and the lead post 11 and the conductive post 6 are connected by the second wire 8. A handle is installed on the top of the box 1, and rollers are installed on the bottom of the box 1.

[0035] like Figure 3 As shown, a sliding rod 20 slides through the fixed plate 9, and a mounting plate 23 is fixed to the bottom end of the sliding rod 20. The measuring end conductive block 14 is fixed on the mounting plate 23. A nut 21 is threaded onto the sliding rod 20, and a first spring 22 is sleeved on the sliding rod 20. The first spring 22 is located between the mounting plate 23 and the fixed plate 9, and the nut 21 is located above the fixed plate 9.

[0036] like Figure 4 , Figure 5 As shown, the bottom of the measuring end conductive block 14 is a concave arc shape, and the top of the input end conductive block 13 is a convex arc shape.

[0037] like Figure 7 As shown, a positioning mechanism 19 is installed on the side of the housing 1. The positioning mechanism 19 includes a sleeve 191, a telescopic rod 192, a positioning ball 193, and a second spring 194. The sleeve 191 is fixed to the inner wall of the housing 1. The telescopic rod 192 is slidably sleeved inside the sleeve 191 through the second spring 194. One end of the telescopic rod 192 is fixed with a positioning ball 193. The handwheel 18 is provided with positioning holes, and there are three positioning holes.

[0038] like Figure 6 As shown, a pointer 17 is fixed to the side of the rotating shaft 15, and a ring-shaped dial 16 is fixed to the side of the housing 1.

[0039] The working principle of this invention is as follows: In this invention, the three lead posts 11 are connected to the three measurement ports of the transformer via cables. Since the measurement ports of the transformer are directly introduced, all wiring can be completed sequentially. When changing the measurement position, it is not necessary to climb again, making the operation more convenient and improving the efficiency, safety and convenience of measurement. Since there are also three measurement posts 3, any two measurement posts 3 can achieve one measurement, with a total of three measurement modes. By rotating the handwheel 18, the rotating shaft 15 can be rotated, the rotating shaft 15 can be rotated, the insulating post 7 can be rotated, and the insulating post 7 can be rotated, the conductive post 6 can be rotated. Thus, there are three possible conduction states between the three measuring end conductive blocks 14 and the three lead end conductive blocks 13, and the three conduction states are interlocked with each other, that is, no two or three conduction states will occur simultaneously, and there will be no mutual interference during measurement. By observing the pointer 17, it is easy to see which conduction state it is in. The positioning ball 193 can be inserted into the positioning hole on the handwheel 18 to locate the conduction state and prevent it from falling off.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A DC resistance test cable junction box, comprising a box body (1), characterized in that: Measuring columns (3) are passed through the side of the housing (1), and there are three measuring columns (3). Leading columns (11) are passed through the side of the housing (1), and there are three leading columns (11). A fixing plate (9) is fixed inside the housing (1), and a measuring end conductive block (14) is installed on the fixing plate (9). There are three measuring end conductive blocks (14). An insulating column (7) is rotatably installed inside the housing (1) via a rotating shaft (15). A conductive column (6) is fixed on the insulating column (7), and there are three conductive columns (6). An inlet end conductive block (13) is fixed on the side of the conductive column (6). One end of the rotating shaft (15) passes through the housing (1) and is fixed with a handwheel (18). A positioning mechanism (19) is installed on the side of the housing (1). The positioning mechanism (19) includes a sleeve (191), a telescopic rod (192), a positioning ball (193), and a second spring (194). The sleeve (191) is fixed on the inner wall of the housing (1). The telescopic rod (192) is slidably connected to the inside of the sleeve (191) through the second spring (194). A positioning ball (193) is fixed at one end of the telescopic rod (192). A positioning hole is provided on the handwheel (18). There are three positioning holes. A pointer (17) is fixed on the side of the rotating shaft (15). An annular scale (16) is fixed on the side of the housing (1). By observing the pointer (17), one can know which conduction condition is being maintained. The positioning ball (193) is inserted into the positioning hole on the handwheel (18) to locate the conduction condition and prevent it from falling off.

2. The DC resistance test cable junction box according to claim 1, characterized in that: The side of the housing (1) is hinged with a protective cover (4), which covers the outside of the three measuring columns (3).

3. The DC resistance test cable junction box according to claim 1, characterized in that: The side of the housing (1) is provided with a sliding groove, and two threaded grooves are provided in the sliding groove. A baffle (10) is slidably installed in the sliding groove. A locking bolt (12) passes through the side of the baffle (10). The locking bolt (12) is connected to the threaded groove by a thread. The baffle (10) covers the outside of the lead post (11).

4. A DC resistance test cable junction box according to claim 1, characterized in that: A slide rod (20) slides through the fixed plate (9), and an mounting plate (23) is fixed to the bottom end of the slide rod (20). The measuring end conductive block (14) is fixed on the mounting plate (23), and a nut (21) is threaded onto the slide rod (20).

5. A DC resistance test cable junction box according to claim 4, characterized in that: A first spring (22) is sleeved on the slide rod (20), the first spring (22) is located between the mounting plate (23) and the fixing plate (9), and the nut (21) is located above the fixing plate (9).

6. A DC resistance test cable junction box according to claim 1, characterized in that: The bottom of the measuring end conductive block (14) is a concave arc shape, and the top of the introducing end conductive block (13) is a convex arc shape.

7. A DC resistance test cable junction box according to claim 1, characterized in that: The measuring column (3) is connected to the measuring end conductive block (14) by a first wire (2), and the lead post (11) and the conductive post (6) are connected by a second wire (8).

8. A DC resistance test cable junction box according to claim 1, characterized in that: The top of the box (1) is equipped with a handle, and the bottom of the box (1) is equipped with wheels.

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