A wide-area power distribution network ground current autonomous measurement device

Abstract

The application discloses a kind of wide-area distribution network ground current autonomous measuring device, including measurement box and wiring mechanism;Wiring mechanism includes wiring cylinder, metal conductor, oval block, rotating rod and two groups of clamping components;Wiring cylinder is fixedly connected to the outside of measurement box;Clamping component includes first clamping half ring, second clamping half ring, inner support block, guide rod, first elastic member and guide cylinder;Oval block is between two inner support blocks;Rotating rod penetrates wiring cylinder, and the end of rotating rod that extends into wiring cylinder is fixedly connected with oval block;Inner support block side surface is fixedly connected with guide rod;Guide rod extends into guide cylinder interior;First elastic member is in guide cylinder;Guide cylinder is fixedly connected with wiring cylinder;First clamping half ring and second clamping half ring are fixedly connected to the two ends of inner support block respectively.The application realizes the connection and disassembly of wire and the wiring end of measuring device conveniently and quickly, and can avoid operator touching the metal end of connecting wire in connection, to reduce the security risk in operation.

Description

Technical Field

[0001] This application relates to the field of power measurement technology, and in particular to an autonomous measurement device for ground current in a wide-area distribution network. Background Technology

[0002] A distribution network refers to a power grid that receives electrical energy from the transmission network or regional power plants and distributes it locally or tiered according to voltage to various users through distribution facilities. It consists of overhead lines, cables, towers, distribution transformers, disconnect switches, reactive power compensators, and some auxiliary facilities, playing a crucial role in distributing electrical energy within the power grid. In distribution networks, traditional relay protection uses a tiered timing coordination of primary and backup protection. Both primary and backup protection require setting values ​​and time limits based on calculation results. After a fault occurs, the primary protection should generally operate; if the primary protection fails to operate, the backup protection must provide an operating signal according to the set time limit and setting value. Because traditional relay protection lacks the technical means to obtain global information and can only rely on local information for fault identification, it is necessary to configure differential protection, overcurrent protection, zero-current protection, impedance protection, etc., for each protection device according to different protection equipment and different fault types. Furthermore, the coordination between protection devices is generally only through setting values ​​and time limits. Wide-area protection focuses on protecting the safe and stable operation of the entire system. It can identify various operating states of the system (normal state, alarm state, etc.) and realize the functions of relay protection and automatic control by adjusting the P-δ, QV and various protection measures of the system. It may involve the action of local and remote switches to avoid serious accidents such as local or entire system blackouts or collapses, and ensure that the power grid can still maintain the required safe and stable operating conditions after a fault.

[0003] In the current distribution network, it is often necessary to use current measuring devices to monitor the power grid in real time in order to detect faults in the grid in a timely manner. However, the connection method between the current measuring device and the power grid is relatively cumbersome. The general connection method is that the operator holds the end of the wire and inserts it into the terminal of the measuring device, and then uses a screwdriver to tighten the fastening bolt on the terminal of the measuring device to complete the connection. During the connection, the operator may touch the metal end of the connecting wire, which poses a huge safety hazard. Utility Model Content

[0004] This application provides an autonomous measurement device for ground current in a wide-area power distribution network, which solves the technical problem in the prior art where the operation of connecting the wire to the terminal of the measuring device is cumbersome and the operator may touch the metal end of the connecting wire, posing a significant safety hazard. The device enables convenient and quick connection and disconnection of the wire and the terminal of the measuring device, and avoids the operator touching the metal end of the connecting wire during the connection, thus reducing the safety hazard during operation.

[0005] This application provides an autonomous measurement device for ground current in a wide-area distribution network, comprising a measurement box and a wiring mechanism disposed outside the measurement box; the wiring mechanism includes a terminal block, a metal conductor, an elliptical block, a rotating rod, and two sets of clamping assemblies symmetrically arranged about the axis of the terminal block; one end of the terminal block is fixedly connected to the outside of the measurement box, the metal conductor is disposed inside the measurement box, and the end of the metal conductor extends into the inside of the terminal block; the clamping assembly includes a first clamping semi-ring, a second clamping semi-ring, an inner support block, a guide rod, a first elastic element, and a guide cylinder; the elliptical block is located between the two inner support blocks, and the arcuate surface of the elliptical block contacts the two opposite sides of the two inner support blocks; the rotating rod moves along the diameter of the terminal block... A rotating rod extends through the terminal block and is rotatably connected to it. The end of the rotating rod extending into the terminal block is fixedly connected to the elliptical block. Two guide rods are fixedly connected to the two opposing sides of the two inner support blocks. The end of the guide rod away from the inner support block extends into the guide cylinder and is slidably connected to the inner side of the guide cylinder. The first elastic element is located inside the guide cylinder, and its two ends abut against the ends of the guide cylinder and the guide rod, respectively. The end of the guide cylinder away from the guide rod is fixedly connected to the terminal block. The first clamping half-ring and the second clamping half-ring are fixedly connected to the two ends of the inner support block, and the inner sides of the two second clamping half-rings can contact the outer side of the metal conductor.

[0006] In one possible implementation, a connecting rod and a connecting block are fixedly connected to both ends of the inner support block, respectively; the first clamping half-ring is fixedly connected to the connecting rod; and the second clamping half-ring is fixedly connected to the connecting block.

[0007] In one possible implementation, a dust cover is detachably connected to the inner side of the end of the junction box.

[0008] In one possible implementation, the wide-area distribution network ground current autonomous measurement device provided in this application further includes a buffer box; the bottom surface of the buffer box is provided with a plurality of second elastic elements; a through groove is opened at the top of one side of the buffer box; the measuring box is inserted into the inner side of the buffer box, and the wiring mechanism passes through the through groove; the bottom surface of the measuring box can abut against the top of the second elastic elements.

[0009] In one possible implementation, the wide-area distribution network ground current autonomous measurement device provided in this application further includes an anti-collision shell; the anti-collision shell is disposed outside the wiring mechanism and is slidably connected to the outside of the buffer box along the height direction of the buffer box; the top of the anti-collision shell and the top of the buffer box are respectively provided with a first connecting hole and a second connecting hole, and a snap-fit ​​rod can be threadedly connected to the first connecting hole and the second connecting hole.

[0010] In one possible implementation, a handle is fixedly connected to the top surface of the measuring box.

[0011] In one possible implementation, a handle is fixedly connected to the end of the rotating rod extending out of the junction box.

[0012] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0013] This application employs a measuring box and a wiring mechanism. The wiring mechanism includes a wiring cylinder, a metal conductor, an elliptical block, a rotating rod, and two sets of clamping assemblies inside the wiring cylinder. Each clamping assembly includes a first clamping half-ring, a second clamping half-ring, an inner support block, a guide rod, a first elastic element, and a guide cylinder. When a wire needs to be connected to the inside of the wiring cylinder, the rotating rod is manually rotated, causing the elliptical block to rotate synchronously. This rotation of the elliptical block opens the two inner support blocks radially along the wiring cylinder. Simultaneously, the guide rod moves inward into the guide cylinder and presses against the first elastic element. The two inner support blocks then cause the two first clamping half-rings to separate synchronously, as well as the two second clamping half-rings. At this point, the two second clamping half-rings leave the metal conductor, increasing the space between the two first clamping half-rings, allowing the end of the wire to be easily inserted into them. Then, the elliptical block is rotated again, ensuring that after rotation... The two inner support blocks are then squeezed, and under the action of the two first elastic elements, the two inner support blocks move towards each other, simultaneously driving the two first clamping half-rings to move closer together, and simultaneously driving the two second clamping half-rings to move closer together. At this time, the space between the two first clamping half-rings becomes smaller, thus clamping the end of the wire. After the two second clamping half-rings move closer together, they re-contact the outside of the metal conductor. Finally, the wire is connected to the metal conductor through the first clamping half-rings, the inner support blocks, and the second clamping half-rings. The whole process is simple and quick to operate, effectively solving the technical problem in the prior art where the operation of connecting the wire to the terminal of the measuring device is relatively cumbersome, and the operator may touch the metal end of the connecting wire during the connection, posing a huge safety hazard. It realizes that the connection and disconnection of the wire and the terminal of the measuring device can be conveniently and quickly achieved, and the operator can avoid touching the metal end of the connecting wire during the connection, reducing the safety hazard during operation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 An isometric view of an autonomous ground current measurement device for a wide-area distribution network provided in an embodiment of this application;

[0016] Figure 2 A top view of a wide-area distribution network autonomous ground current measurement device provided in an embodiment of this application;

[0017] Figure 3 for Figure 2 Isometric sectional view along the AA direction;

[0018] Figure 4 for Figure 3 A magnified view of a portion of region C in the middle;

[0019] Figure 5 for Figure 2 Isometric sectional view along the BB direction;

[0020] Figure 6 An isometric view of the wiring mechanism provided in the embodiments of this application after removing the wiring sleeve;

[0021] Figure 7 for Figure 1 Axonometric view of the Lieutenant General's crash protection shell after it has slid downwards;

[0022] Figure 8 for Figure 7 A magnified view of a portion of region D in the middle;

[0023] Figure 9 An isometric view of the buffer box, anti-collision shell, and snap-fit ​​rod provided in the embodiments of this application before connection;

[0024] Figure 10 for Figure 9 A magnified view of a portion of region E in the middle.

[0025] Reference numerals: 1-Measuring box; 2-Connecting mechanism; 21-Connecting tube; 22-Metallic conductor; 23-Elliptical block; 24-Rotating rod; 25-Clamping assembly; 251-First clamping half-ring; 252-Second clamping half-ring; 253-Inner support block; 254-Guide rod; 255-First elastic element; 256-Guide tube; 3-Connecting rod; 4-Connecting block; 5-Dust cover; 6-Buffer box; 61-Second elastic element; 62-Second connecting hole; 63-Through groove; 64-Slide groove; 7-Anti-collision shell; 71-First connecting hole; 72-Snap-fit ​​rod; 8-Handle; 9-Rotating handle. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0027] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0028] Reference Figures 1-8This application provides an autonomous measurement device for ground current in a wide-area distribution network, comprising a measurement box 1 and a wiring mechanism 2 disposed outside the measurement box 1; the wiring mechanism 2 includes a wiring tube 21, a metal conductor 22, an elliptical block 23, a rotating rod 24, and two sets of clamping assemblies 25 symmetrically arranged about the axis of the wiring tube 21; one end of the wiring tube 21 is fixedly connected to the outside of the measurement box 1, the metal conductor 22 is disposed inside the measurement box 1, and the end of the metal conductor 22 extends into the inside of the wiring tube 21; the clamping assembly 25 includes a first clamping semi-ring 251, a second clamping semi-ring 252, an inner support block 253, a guide rod 254, a first elastic element 255, and a guide cylinder 256; the elliptical block 23 is located between the two inner support blocks 253, and the arcuate surface of the elliptical block 23 contacts the two opposite sides of the two inner support blocks 253; the rotating rod 24 moves along... A radially extending portion of the connector 21 passes through the connector 21 and is rotatably connected to it. A rotating rod 24 extends into the end of the connector 21 and is fixedly connected to the elliptical block 23. Two guide rods 254 are fixedly connected to the two opposing sides of the two inner support blocks 253. The ends of the guide rods 254 away from the inner support blocks 253 extend into the guide cylinder 256 and are slidably connected to the inner side of the guide cylinder 256. A first elastic element 255 is located inside the guide cylinder 256, and both ends of the first elastic element 255 abut against the ends of the guide cylinder 256 and the guide rods 254, respectively. The end of the guide cylinder 256 away from the guide rods 254 is fixedly connected to the connector 21. A first clamping half-ring 251 and a second clamping half-ring 252 are fixedly connected to the two ends of the inner support blocks 253, and the inner sides of the two second clamping half-rings 252 can contact the outer side of the metal conductor 22.In this embodiment, the first clamping semi-ring 251 is a common arc-shaped plate structure. The two first clamping semi-rings 251 move in opposite directions to clamp the end of the wire. The structure of the second clamping semi-ring 252 needs to be designed according to the structure of the metal conductor 22. In this embodiment, the outer side of the metal conductor 22 is a conical structure, and correspondingly, the inner side of the second clamping semi-ring 252 is an arc-shaped conical surface structure. After the two second clamping semi-rings 252 move in opposite directions, they can adhere to the outer side of the metal conductor 22. The two inner support blocks 253 have arc-shaped surface structures on opposite sides. When the elliptical block 23 rotates, the outer side of the major axis end of the elliptical block 23 can slide along the arc-shaped surface structure of the inner support block 253 and squeeze the inner support block 253. The two inner support blocks 253 can be smoothly opened outwards. The elliptical block 23 is made of insulating material, such as smooth hard plastic. The end of the rotating rod 24 is located at the center of the ellipse. The first clamping half-ring 251, the second clamping half-ring 252, and the inner support block 253 are all made of conductive metal. The rotating rod 24, the guide rod 254, the guide cylinder 256, and the wiring cylinder 21 are all made of insulating material. The first elastic element 255 is a spring. When it is necessary to measure the ground current, that is, when the wire needs to be connected to the inside of the wiring cylinder 21, the rotating rod 24 is manually rotated, so that the elliptical block 23 rotates synchronously. Through the rotation of the elliptical block 23, the two inner support blocks 253 can be opened outwards along the radial direction of the wiring cylinder 21. At the same time, the guide rod 254 moves towards the guide cylinder. The internal movement of 256 compresses the first elastic element 255. Simultaneously, the two inner support blocks 253 drive the two first clamping half-rings 251 to separate synchronously, and also drive the two second clamping half-rings 252 to separate synchronously. At this time, the two second clamping half-rings 252 leave the metal conductor 22, and the space between the two first clamping half-rings 251 increases, allowing the end of the wire to be smoothly inserted into the two first clamping half-rings 251. Then, the elliptical block 23 is rotated again, so that after the rotation, the elliptical block 23 no longer compresses the two inner support blocks 253. The two inner support blocks 253 move towards each other under the action of the two first elastic elements 255, and simultaneously drive the two first clamping half-rings 251 to move closer together, and simultaneously drive the two second clamping half-rings... When the two first clamping half-rings 252 approach each other, the space between them decreases, thus clamping the end of the wire. After the two second clamping half-rings 252 approach each other, they re-contact the outside of the metal conductor 22. Finally, the wire is connected to the metal conductor 22 through the first clamping half-rings 251, the inner support block 253, and the second clamping half-rings 252, thereby realizing the measurement of the ground current. After the measurement is completed, when it is necessary to remove the wire from the terminal block 21, simply rotate the rotating rod 24 to drive the elliptical block 23 to rotate. The elliptical block 23 will then open the two inner support blocks 253 again, causing the two first clamping half-rings 251 to separate again and no longer clamp the end of the wire. The wire can then be directly pulled out of the terminal block 21.

[0029] Reference Figure 4 , Figure 6 The inner support block 253 has a connecting rod 3 and a connecting block 4 fixedly connected to its two ends, respectively; the first clamping half-ring 251 is fixedly connected to the connecting rod 3; and the second clamping half-ring 252 is fixedly connected to the connecting block 4. Specifically, in this embodiment, the two ends of the inner support block 253 are fixedly connected to the first clamping half-ring 251 and the second clamping half-ring 252 respectively through the connecting rod 3 and the connecting block 4, for supporting the first clamping half-ring 251 and the second clamping half-ring 252. The connecting rod 3 and the connecting block 4 are both made of conductive metal.

[0030] Reference Figure 4 , Figure 8 A dust cover 5 is detachably connected to the inner side of the end of the junction box 21. In this embodiment, the dust cover 5 is further provided. The dust cover 5 can be threaded to the end of the junction box 21 or plugged in. When not in use, the dust cover 5 is connected to the end of the junction box 21 to prevent dust from entering the inside of the junction box 21.

[0031] Reference Figure 1 , Figure 3 , Figures 7-10 This application provides a wide-area distribution network ground current autonomous measurement device, which also includes a buffer box 6. The bottom surface of the buffer box 6 is provided with multiple second elastic elements 61. A through groove 63 is provided at the top of one side of the buffer box 6. The measuring box 1 is inserted into the inner side of the buffer box 6, and the wiring mechanism 2 passes through the through groove 63. The bottom surface of the measuring box 1 can abut against the top of the second elastic element 61. This application further provides a buffer box 6 and second elastic elements 61, mainly considering that the measuring box 1 will vibrate during transportation. During transportation, the measuring box 1 is placed in the buffer box 6, and the second elastic elements 61 can effectively buffer the measuring box 1, preventing damage due to vibration. The second elastic element 61 is a spring. Specifically, by providing the through groove 63, the wiring mechanism 2 can be placed. When the measuring box 1 moves up and down, the wiring mechanism 2 will rise and fall in the through groove 63 without interfering with the buffer box 6.

[0032] Reference Figure 1 , Figures 7-10The embodiment of this application provides a wide-area distribution network ground current autonomous measurement device, which also includes a collision protection shell 7. The collision protection shell 7 is disposed outside the wiring mechanism 2 and is slidably connected to the outside of the buffer box 6 along the height direction of the buffer box 6. The top of the collision protection shell 7 and the top of the buffer box 6 are respectively provided with a first connecting hole 71 and a second connecting hole 62, and a snap-fit ​​rod 72 can be threadedly connected to the first connecting hole 71 and the second connecting hole 62. In this embodiment, a crash shield 7 is further provided, mainly to protect the wiring mechanism 2. Since the wiring mechanism 2 protrudes from the outside of the measuring box 1, it is easily damaged by collisions with other external equipment. The cross-section of the crash shield 7 is U-shaped, and a sliding groove 64 is provided on the outside of the measuring box 1. The open end of the crash shield 7 can slide up and down in the sliding groove 64. When measurement is required, the crash shield 7 is slid down to expose the wiring tube 21, which facilitates the subsequent connection of the wire to the wiring tube 21. After the measurement is completed and the wire is pulled out from the wiring tube 21, the crash shield 7 is slid up to cover the wiring tube 21. At the same time, the first connecting hole 71 and the second connecting hole 62 are aligned, and the locking rod 72 is screwed into the second connecting hole 62, so that the locking rod 72 passes into the first connecting hole 71, thereby limiting and locking the crash shield 7. Specifically, the cross-section of the sliding groove 64 is L-shaped.

[0033] Reference Figure 1 A handle 8 is fixedly connected to the top surface of the measuring box 1. In this embodiment, the handle 8 is specifically provided on the top surface of the measuring box 1 to facilitate lifting the measuring box 1 out of or into the buffer box 6.

[0034] Reference Figure 4 , Figure 6 , Figure 8 A handle 9 is fixedly connected to the end of the rotating rod 24 that extends out of the wiring tube 21. Specifically, in this embodiment, a handle 9 is provided at the end of the rotating rod 24 to facilitate rotation of the rotating rod 24.

[0035] The working principle of the autonomous ground current measurement device for a wide-area distribution network provided in this application embodiment is as follows:

[0036] When it is necessary to measure the ground current, i.e., to connect the wire to the inside of the junction box 21, loosen the locking rod 72, slide the anti-collision shell 7 downward to expose the junction box 21, and then manually rotate the rotating rod 24 to make the elliptical block 23 rotate synchronously. The rotation of the elliptical block 23 will open the two inner support blocks 253 along the radial direction of the junction box 21. At the same time, the guide rod 254 moves into the guide cylinder 256 and squeezes the first elastic element 255. Meanwhile, the two inner support blocks 253 drive the two The first clamping half-ring 251 separates synchronously, simultaneously causing the two second clamping half-rings 252 to separate synchronously. At this time, the two second clamping half-rings 252 leave the metal conductor 22, and the space between the two first clamping half-rings 251 increases, making it easier to smoothly insert the end of the wire into the two first clamping half-rings 251. Then, the elliptical block 23 is rotated again, so that after the rotation, the elliptical block 23 no longer squeezes the two inner support blocks 253. The two inner support blocks 253 move towards each other under the action of the two first elastic elements 255, and at the same time... This causes the two first clamping semi-rings 251 to move closer simultaneously, and simultaneously causes the two second clamping semi-rings 252 to move closer simultaneously. At this time, the space between the two first clamping semi-rings 251 becomes smaller, thus clamping the end of the wire. After the two second clamping semi-rings 252 move closer, they re-contact the outside of the metal conductor 22, ultimately connecting the wire to the metal conductor 22 through the first clamping semi-rings 251, connecting rod 3, inner support block 253, connecting block 4, and second clamping semi-rings 252, thereby realizing the measurement of the ground current; After the measurement is completed, when it is necessary to remove the wire from the connector 21, simply rotate the rotating rod 24 to drive the elliptical block 23 to rotate. The elliptical block 23 will then open the two inner support blocks 253 again, causing the two first clamping half rings 251 to separate again and no longer clamp the end of the wire. The wire can then be pulled out of the connector 21 directly. After that, slide the anti-collision shell 7 upward to cover the connector 21. At the same time, twist the locking rod 72 and insert it into the first connecting hole 71 to achieve the limiting locking of the anti-collision shell 7.

[0037] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0038] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A device for autonomously measuring ground current in a wide-area distribution network, characterized in that, It includes a measuring box (1) and a wiring mechanism (2) disposed on the outside of the measuring box (1); The wiring mechanism (2) includes a wiring cylinder (21), a metal conductor (22), an elliptical block (23), a rotating rod (24), and two sets of clamping assemblies (25) symmetrically arranged about the axis of the wiring cylinder (21). One end of the connector tube (21) is fixedly connected to the outside of the measuring box (1), and the metal conductor (22) is disposed inside the measuring box (1), with the end of the metal conductor (22) extending into the inside of the connector tube (21). The clamping assembly (25) includes a first clamping half-ring (251), a second clamping half-ring (252), an inner support block (253), a guide rod (254), a first elastic element (255), and a guide cylinder (256). The elliptical block (23) is located between the two inner support blocks (253), and the arc-shaped surface of the elliptical block (23) is in contact with the two opposite sides of the two inner support blocks (253); The rotating rod (24) passes through the junction box (21) in the radial direction and is rotatably connected to the junction box (21). The end of the rotating rod (24) extending into the junction box (21) is fixedly connected to the elliptical block (23). Two guide rods (254) are fixedly connected to the two opposite sides of the two inner support blocks (253); The end of the guide rod (254) away from the inner support block (253) extends into the interior of the guide cylinder (256) and is slidably connected to the inner side of the guide cylinder (256); The first elastic element (255) is located inside the guide cylinder (256), and the two ends of the first elastic element (255) abut against the ends of the guide cylinder (256) and the guide rod (254), respectively. The end of the guide cylinder (256) facing away from the guide rod (254) is fixedly connected to the wiring cylinder (21); The first clamping half ring (251) and the second clamping half ring (252) are respectively fixedly connected to the two ends of the inner support block (253), and the inner sides of the two second clamping half rings (252) can contact the outer side of the metal conductor (22).

2. The wide-area distribution network autonomous ground current measurement device according to claim 1, characterized in that, The two ends of the inner support block (253) are respectively fixedly connected to a connecting rod (3) and a connecting block (4); The first clamping half-ring (251) is fixedly connected to the connecting rod (3); The second clamping half ring (252) is fixedly connected to the connecting block (4).

3. The wide-area distribution network autonomous ground current measurement device according to claim 1, characterized in that, A dust cover (5) is detachably connected to the inner side of the end of the junction box (21).

4. The wide-area distribution network autonomous ground current measurement device according to claim 1, characterized in that, It also includes a buffer box (6); The bottom surface of the buffer box (6) is provided with a plurality of second elastic elements (61). A through groove (63) is provided at the top of one side of the buffer box (6). The measuring box (1) is inserted into the inner side of the buffer box (6), and the wiring mechanism (2) passes through the through groove (63). The bottom surface of the measuring box (1) can abut against the top of the second elastic member (61).

5. The wide-area distribution network autonomous ground current measurement device according to claim 4, characterized in that, It also includes a shock-absorbing shell (7); The anti-collision shell (7) is disposed outside the wiring mechanism (2) and is slidably connected to the outside of the buffer box (6) along the height direction of the buffer box (6); The top of the anti-collision shell (7) and the top of the buffer box (6) are respectively provided with a first connecting hole (71) and a second connecting hole (62), and a snap-fit ​​rod (72) can be threaded into the first connecting hole (71) and the second connecting hole (62).

6. The wide-area distribution network autonomous ground current measurement device according to claim 1, characterized in that, A handle (8) is fixedly connected to the top surface of the measuring box (1).

7. The wide-area distribution network autonomous ground current measurement device according to claim 1, characterized in that, The end of the rotating rod (24) extending out of the connector (21) is fixedly connected to a rotating handle (9).

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