A direct current multi-point grounding fault finder

Abstract

The application provides a direct current multi-point grounding fault finder, and relates to the technical field of direct current system fault finding. The direct current multi-point grounding fault finder comprises a shell, an instrument body arranged in the shell, a top cover arranged on the shell, an electric leakage detection structure arranged on the top cover, a plurality of storage batteries and a heat dissipation structure arranged at the bottom of the shell, a clamping and fixing structure fixed in the shell, the storage batteries corresponding to the instrument body and the electric leakage detection structure, the heat dissipation structure corresponding to the clamping and fixing structure, the clamping and fixing structure corresponding to the top cover, and a jacking structure in sliding fit with the shell. In the application, the top cover is arranged on the shell, and the jacking structure is arranged in the shell. The top cover can be jacked up through the jacking structure, so that protection is formed on the top through the top cover during use, the instrument body is prevented from being damaged, the top cover can be directly flipped for use, the use is more flexible, the device is more convenient to use, and the device is suitable for different environments.

Description

Technical Field

[0001] This invention relates to the field of DC system fault finding technology, specifically a DC multi-point grounding fault finder. Background Technology

[0002] DC systems are an important component of power systems, serving as DC power sources for relay protection, control signals, automatic devices, emergency lighting, and main equipment operation control. Under normal circumstances, the positive and negative terminals of a DC system have balanced voltages to ground, and the insulation level is normal. DC system grounding is a common and highly dangerous fault. While a single grounding fault in a DC system may not significantly affect the normal operation of equipment or the system itself, two or more grounding faults can cause malfunctions or failures in the protection devices, severely impacting equipment and personnel safety. Existing DC system grounding fault location equipment is greatly affected by the grounding type and working environment. Complex working environments can damage the equipment, affecting its lifespan. Furthermore, existing DC grounding fault location devices typically use foam clamps for fixing the detectors and sensors after they are removed from the protective box and connected. Over time, the foam loses its elasticity, causing the equipment to shake and potentially damage it.

[0003] Therefore, the present invention provides a DC multi-point grounding fault finder. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a DC multi-point grounding fault finder, solving the problems mentioned in the background section. This invention is applicable to various environments, expanding the device's scope of application; it extends the device's single-use time and eliminates the need for cable power supply, making its application more flexible; during use, a heat dissipation structure prevents overheating of the battery and instrument body, thus extending its lifespan; in high humidity conditions, the entry of humid air into the instrument body can damage it, further protecting it and extending its lifespan; a leakage detection structure on the top cover detects damage to the DC cable, aiding in the detection of DC multi-point grounding faults; the support structure provides shock absorption, preventing vibration damage and extending its lifespan; the support structure can be retracted when not in use for easy storage and transportation; and the support structure can elevate the device, facilitating air intake for the heat dissipation structure, improving its efficiency and ensuring effective heat dissipation.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a DC multi-point grounding fault finder, comprising a housing, an instrument body installed inside the housing, a top cover installed on the housing, a leakage detection structure installed on the top cover, multiple sets of batteries and a heat dissipation structure installed at the bottom inside the housing, a clamping and fixing structure fixed inside the housing, the batteries corresponding to the instrument body and the leakage detection structure, the heat dissipation structure corresponding to the clamping and fixing structure, the clamping and fixing structure corresponding to the top cover, a lifting structure slidingly fitted inside the housing, a snap-fit ​​structure and a rotating structure installed between the lifting structure and the top cover, a support structure installed on the lower side of the housing, the support structure corresponding to the lifting structure, and a locking structure installed between the support structure and the lifting structure.

[0006] Furthermore, the outer casing has multiple first sliding grooves, and the lifting structure includes multiple first support rods and second support rods, with the first sliding grooves corresponding to the first support rods and second support rods.

[0007] Furthermore, the support structure includes multiple telescopic rods, and the locking structure includes screws fixed to the telescopic rods. Threaded grooves are provided in both the first support rod and the second support rod, and the threaded grooves correspond to the screws.

[0008] Furthermore, the bottom of the outer shell is provided with multiple grooves, which correspond to the telescopic rod. The telescopic rod includes a first rod body and a second rod body. A second sliding groove is provided inside the first rod body, which corresponds to the second rod body. A first spring and a damping block are installed between the second rod body and the groove wall of the second sliding groove. A limit plate is fixed to the end of the second rod body. The limit plate is rotatably connected to the groove wall of the groove. A rotating groove corresponding to the limit plate is provided inside the groove. The limit plate is fixedly connected to the screw.

[0009] Furthermore, the groove is provided with multiple first slots, and multiple first blocks are fixed on the periphery of the first rod. The multiple first slots are arranged in two layers, one above the other. The first blocks are annular structures, the first slots are annular grooves, the first blocks rotate in the first slots, and the first blocks are made of rubber material.

[0010] Furthermore, the snap-fit ​​structure includes a second snap-fit ​​block fixed to the end of the first support rod, and a second snap-fit ​​groove is provided inside the top cover, the second snap-fit ​​groove corresponding to the second snap-fit ​​block.

[0011] Furthermore, the rotating structure includes a rotating frame fixed to the end of the second support rod, a rotating shaft fixed inside the rotating frame, and the rotating shaft being rotatably connected to the top cover. The leakage current detection structure includes an electromagnetic induction sensor fixed to the top cover.

[0012] Furthermore, the clamping and fixing structure includes a heat-conducting plate and an upper clamping plate fixed inside the outer shell. The upper clamping plate has a U-shaped structure, and the instrument body is placed between the heat-conducting plate and the upper clamping plate. The heat-conducting plate is in contact with the bottom of the instrument body.

[0013] Furthermore, the heat dissipation structure includes multiple heat sinks fixed to the lower side of the heat-conducting plate. The heat sinks are located above the battery and in contact with the battery. An air inlet is provided at the bottom of the housing, and air outlets are provided on both sides of the housing. The air outlets are located on the sides of the heat sinks, and a blower is fixed inside the air inlet.

[0014] Furthermore, a third sliding groove is provided in the upper clamping plate, and a sliding plate is slidably fitted in the third sliding groove. Multiple second springs are fixed between the sliding plate and the third sliding groove. The sliding plate has a U-shaped structure, and multiple third locking blocks are fixed at the ends of the sliding plate. A first slot is provided in the top cover, and an insert rod is fixed on the sliding plate. The insert rod corresponds to the first slot. Multiple fourth locking slots are provided in the first slot, and multiple fifth locking slots are provided in the third sliding groove. The fourth and fifth locking slots correspond to the third locking blocks.

[0015] The beneficial effects of this invention are:

[0016] 1. A top cover is installed on the outer shell, and a lifting structure is installed inside the outer shell. The top cover can be lifted by the lifting structure, so that the top cover can form protection on the top during use to prevent damage to the instrument body. The top cover can also be flipped directly for use, which makes it more flexible and convenient to use. This makes the device suitable for different environments and expands the scope of application of the device.

[0017] 2. Multiple sets of batteries and a heat dissipation structure are installed at the bottom inside the casing. Power can be supplied by multiple batteries, extending the single-use time of the device. Furthermore, the elimination of power cables makes the device more flexible in its application. During use, the heat dissipation structure prevents overheating of the batteries and the instrument body, thus preventing damage and extending the device's lifespan. The heat-conducting plate and heat sink not only increase the area for airflow and improve heat dissipation efficiency but also block the bottom of the instrument body. In high-humidity conditions, humid air entering the instrument body can cause damage, thus providing some protection and extending the instrument's lifespan.

[0018] 3. Installing a leakage current detection structure on the top cover can detect whether the DC cable is damaged, thereby assisting in the detection of DC multi-point grounding faults.

[0019] 4. A support structure is installed on the lower side of the outer shell, and a locking structure is installed between the support structure and the lifting structure. The support structure can drive the locking structure to lock the position of the lifting structure, thereby ensuring the stability of the top cover during protection. The support structure can also provide a certain shock absorption effect, preventing vibration from damaging the device and extending its service life. The support structure can also be retracted when not in use, making it convenient for storage and transportation of the device. The support structure can also raise the device, making it easier for the heat dissipation structure to intake air for cooling, improving the heat dissipation efficiency and ensuring the heat dissipation effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall assembly three-dimensional structure of a DC multi-point grounding fault finder according to the present invention;

[0021] Figure 2 This is a schematic diagram of the assembly structure of the outer shell and air inlet in a DC multi-point grounding fault finder according to the present invention;

[0022] Figure 3 This is an exploded view of the outer casing, instrument body, and top cover of a DC multi-point grounding fault finder according to the present invention.

[0023] Figure 4 This is a schematic diagram of the assembly structure of the outer shell, the first support rod, and the second support rod in a DC multi-point grounding fault finder according to the present invention.

[0024] Figure 5 for Figure 4 A schematic diagram at point A in the middle;

[0025] Figure 6 This is a three-dimensional structural diagram of the top cover and the first support rod in a DC multi-point grounding fault finder according to the present invention.

[0026] Figure 7 This is a schematic diagram of the overall assembly cross-sectional structure of a DC multi-point grounding fault finder according to the present invention;

[0027] Figure 8 for Figure 7 A schematic diagram at point B in the middle;

[0028] Figure 9 This is a schematic diagram of the assembly structure of the DC multi-point grounding fault finder when the top cover is lifted.

[0029] Figure 10 This is a schematic diagram of the assembly structure of the top cover of a DC multi-point grounding fault finder when it is flipped up.

[0030] Figure 11 This is a schematic diagram of the assembly structure of the rotating frame in a DC multi-point grounding fault finder according to the present invention;

[0031] Figure 12 This is a schematic diagram of the assembly structure of the heat sink and battery in a DC multi-point grounding fault finder according to the present invention.

[0032] In the diagram: 1. Outer shell; 2. Instrument body; 3. Heat-conducting plate; 4. Heat sink; 5. Battery; 6. Air inlet; 7. Air outlet; 8. Hair dryer; 9. Electromagnetic induction sensor; 10. First slide groove; 11. First support rod; 12. Second support rod; 13. Threaded groove; 14. Screw; 15. Groove; 16. Telescopic rod; 17. First rod body; 18. Second rod body; 19. Limiting plate; 20. First slot; 21. First locking block; 22. Second slide groove; 23. First spring; 24. Second locking block; 25. Second slot; 26. Rotating frame; 27. Rotating shaft; 28. Top cover; 29. ​​First slot; 30. Insert rod; 31. Upper clamping plate; 32. Slide plate; 33. Third slide groove; 34. Second spring; 35. Third locking block; 36. Fourth slot; 37. Fifth slot. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] Please see Figures 1 to 12 This invention provides a technical solution: a DC multi-point grounding fault finder, comprising a housing 1, an instrument body 2 installed inside the housing 1, a top cover 28 installed on the housing 1, a leakage detection structure installed on the top cover 28, multiple sets of batteries 5 and a heat dissipation structure installed at the bottom inside the housing 1, a clamping and fixing structure fixed inside the housing 1, the batteries 5 corresponding to the instrument body 2 and the leakage detection structure, the heat dissipation structure corresponding to the clamping and fixing structure, the clamping and fixing structure corresponding to the top cover 28, a lifting structure slidingly fitted inside the housing 1, a snap-fit ​​structure and a rotating structure installed between the lifting structure and the top cover 28, a support structure installed on the lower side of the housing 1, the support structure corresponding to the lifting structure, and a locking structure installed between the support structure and the lifting structure.

[0035] In this embodiment, the outer casing 1 has a plurality of first sliding grooves 10, the lifting structure includes a plurality of first support rods 11 and second support rods 12, the first sliding grooves 10 correspond to the first support rods 11 and second support rods 12, the support structure includes a plurality of telescopic rods 16, and the locking structure includes a screw 14 fixed on the telescopic rods 16. The first support rods 11 and the second support rods 12 are both provided with threaded grooves 13, and the threaded grooves 13 correspond to the screws 14.

[0036] Specifically, when the top cover 28 needs to be lifted, the telescopic rod 16 can be rotated, causing the telescopic rod 16 to drive the screw 14 to rotate, thereby pushing the first support rod 11 and the second support rod 12 upwards. To facilitate upward sliding, one of the screws 14 can be made into a threaded structure, while the other screws 14 can be made into a smooth structure. At this time, rotating one of the telescopic rods 16 can drive the top cover 28 to move upwards. As the top cover 28 moves upwards, the instrument body 2 is exposed, and the instrument body 2 can be used. At this time, the top cover 28 is located directly above the instrument body 2, which can protect the instrument body 2 and prevent external objects from falling from above and damaging the instrument body 2. Furthermore, the sliding range of the first support rod 11 and the second support rod 12 can be adjusted by rotating the telescopic rod 16 to drive the screw 14, thereby adjusting the height of the top cover 28. This allows the device to be adjusted according to actual needs, expanding the applicability of the device.

[0037] The bottom of the outer casing 1 has multiple grooves 15, which correspond to the telescopic rod 16. The telescopic rod 16 includes a first rod body 17 and a second rod body 18. The first rod body 17 has a second sliding groove 22, which corresponds to the second rod body 18. A first spring 23 and a damping block are installed between the second rod body 18 and the groove wall of the second sliding groove 22. A limit plate 19 is fixed to the end of the second rod body 18. The limit plate 19 is rotatably connected to the groove wall of the groove 15. A rotating groove corresponding to the limit plate 19 is opened in the groove 15. The limit plate 19 is fixedly connected to the screw 14. Multiple first slots 20 are opened in the groove 15. Multiple first blocks 21 are fixed to the periphery of the first rod body 17. The multiple first slots 20 are arranged in two layers, one above the other. The first blocks 21 have a ring structure, and the first slots 20 have an annular grooves. The first blocks 21 rotate in the first slots 20. The first blocks 21 are made of rubber material.

[0038] Specifically, when using the device to locate grounding faults, the telescopic rod 16 can be pulled down, causing the first rod 17 to extend and contact the ground. This allows the device to be raised, facilitating air intake at the air inlet 6 and improving heat dissipation. When vibration damping is not required, the first rod 17 can be slid to a certain position until the first locking block 21 slides into the lower first locking groove 20. This creates a locking relationship between the first locking block 21 and the lower first locking groove 20, limiting the position of the first locking block 21 and ensuring device stability. When vibration damping is required, the first locking block 21 can be completely slid out. The device is supported by the elasticity of the first spring 23 and the limiting relationship between the first locking block 21 and the groove 15. When vibration occurs, the second rod 18 slides relative to the first rod 17. The first spring 23 provides good buffering, and the first locking block 21 and the damping block provide good vibration damping, preventing damage to the device and extending its service life.

[0039] The snap-fit ​​structure includes a second snap block 24 fixed to the end of the first support rod 11, and a second snap groove 25 is provided in the top cover 28. The second snap groove 25 corresponds to the second snap block 24. The rotating structure includes a rotating frame 26 fixed to the end of the second support rod 12. A rotating shaft 27 is fixed in the rotating frame 26 and is rotatably connected to the top cover 28. The leakage current detection structure includes an electromagnetic induction sensor 9 fixed on the top cover 28.

[0040] Specifically, when the device needs to be protected by the top cover 28, the top cover 28 is pushed upwards. At this time, the second locking block 24 is located in the second locking groove 25, and a locking relationship is formed between the second locking block 24 and the second locking groove 25. Thus, the first support rod 11 and the second support rod 12 can support the top cover 28. When the top cover 28 needs to be flipped, the top cover 28 can be pushed upwards from the side of the first support rod 11, so that the second locking block 24 is pushed out from the second locking groove 25. Thus, the second locking block 24 and the second locking groove 25 lose their locking relationship, and the top cover 28 can be rotated through the rotating shaft 27. This allows the top cover 28 to be flipped, making the device more flexible to use. The position and angle of the top cover 28 can be adjusted as needed, expanding the applicability of the device.

[0041] The clamping and fixing structure includes a heat-conducting plate 3 and an upper clamping plate 31 fixed inside the outer shell 1. The upper clamping plate 31 has a U-shaped structure. The instrument body 2 is placed between the heat-conducting plate 3 and the upper clamping plate 31. The heat-conducting plate 3 is in contact with the bottom of the instrument body 2. The heat dissipation structure includes multiple heat sinks 4 fixed to the lower side of the heat-conducting plate 3. The heat sinks 4 are located above the battery 5 and in contact with the battery 5. An air inlet 6 is opened at the bottom of the outer shell 1. Air outlets 7 are opened on both sides of the outer shell 1. The air outlets 7 are located on the side of the heat sinks 4. A blower 8 is fixed inside the air inlet 6.

[0042] Specifically, when heat dissipation is required, the blower 8 is activated, allowing cooler external air to enter the outer casing 1 through the air outlet 7. This air exchanges heat with the battery 5, heat-conducting plate 3, and heat sink 4 before being blown out through the air outlet 7, thus achieving a good heat dissipation effect. The heat generated by the instrument body 2 during operation is transferred to the heat sink 4 through the heat-conducting plate 3, increasing the heat exchange area and improving heat dissipation efficiency. Furthermore, heat dissipation through the heat-conducting plate 3 prevents the blower 8 from blowing directly onto the instrument body 2, preventing humid external air from directly entering the instrument body 2, thereby protecting the instrument body 2 and extending its service life. The heat-conducting plate 3 also supports the instrument body 2, and together with the clamping plate 31, clamps and fixes the instrument body 2, ensuring its stability.

[0043] The upper clamping plate 31 has a third sliding groove 33, and a sliding plate 32 is slidably fitted in the third sliding groove 33. Multiple second springs 34 are fixed between the sliding plate 32 and the third sliding groove 33. The sliding plate 32 has a U-shaped structure. Multiple third locking blocks 35 are fixed at the ends of the sliding plate 32. The top cover 28 has a first slot 29. A plug rod 30 is fixed on the sliding plate 32. The plug rod 30 corresponds to the first slot 29. Multiple fourth locking slots 36 are opened in the first slot 29. Multiple fifth locking slots 37 are opened in the third sliding groove 33. The fourth locking slots 36 and the fifth locking slots 37 all correspond to the third locking blocks 35.

[0044] Specifically, when the top cover 28 is closed, the slide plate 32 inside the upper clamping plate 31 is inserted into the first slot 29 under the action of the second spring 34, and the third locking block 35 enters the fourth locking groove 36, thereby sealing the outer shell 1 and the top cover 28. This protects the instrument body 2 when it is not in use, preventing damage to the instrument body 2. When the instrument body 2 is in use, the top cover 28 is flipped or moved upward, thereby separating the third locking block 35 from the fourth locking groove 36. At this time, the slide plate 32 is pressed down, causing the slide plate 32 to enter the third sliding groove 33, and the third locking block 35 to enter the fifth locking groove 37. This creates a locking relationship between the third locking block 35 and the fifth locking groove 37, preventing the slide plate 32 from being limited during the use of the instrument body 2, thus ensuring the user experience of the instrument body 2.

[0045] The structure of the instrument body 2 is the same as that of the DC grounding fault finder disclosed in the patent with announcement number CN207866955U.

[0046] Workflow: During inspection, connect instrument body 2 to the DC bus under test. Calculate the balance bridge resistance and ground insulation resistance of the DC system using the ping-pong principle. If an insulation fault exists in the DC system, instrument body 2 will activate a detection bridge with a pre-set frequency and amplitude. Instrument body 2 locates the ground fault point by detecting the current signal in each branch. Connect instrument body 2 to two DC bus sections under test, switch the detection bridge to one of the bus sections, compare the voltage change waveforms of the two bus sections, and determine whether a loop fault or insulation fault exists based on the voltage change relationship. If a loop fault or insulation fault exists, the detection bridge will continue to be activated to allow the branch detector to locate the loop fault point. When a loop fault exists in both branches, instrument body 2 and the data acquisition unit can be used to detect the branches that may have a loop fault one by one. The location of the loop fault point is ultimately achieved based on the waveform and direction displayed by instrument body 2.

[0047] When using the instrument body 2, rotating the telescopic rod 16 causes the screw 14 to rotate, which in turn pushes the first support rod 11 and the second support rod 12 upwards, thus lifting the top cover 28 for use. At this point, the top cover 28 is directly above the instrument body 2, providing protection. Pulling the telescopic rod 16 downwards extends the first rod 17, bringing it into contact with the ground. This raises the device, facilitating air intake 6 and improving heat dissipation. When vibration damping is not required, sliding the first rod 17 to a certain position... The first locking block 21 slides into the lower first locking groove 20, at which point a locking relationship is formed between the first locking block 21 and the lower first locking groove 20, which limits the position of the first locking block 21 and ensures the stability of the device. When shock absorption is required, the first locking block 21 is completely slid out, and the device is supported by the elastic force of the first spring 23 and the limiting relationship between the first locking block 21 and the groove 15. Then the blower 8 is turned on, so that the blower 8 blows air, and the cooler air from the outside enters the outer casing 1 from the air outlet 7. After exchanging heat with the battery 5, the heat conduction plate 3 and the heat sink 4, the air is blown out from the air outlet 7, which can achieve a good heat dissipation effect.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A DC multi-point grounding fault finder, comprising a housing (1), characterized in that, The outer casing (1) houses the instrument body (2), and the outer casing (1) is equipped with a top cover (28). The top cover (28) is equipped with a leakage detection structure. The bottom of the outer casing (1) is equipped with multiple sets of batteries (5) and a heat dissipation structure. The outer casing (1) is fixed with a clamping and fixing structure. The batteries (5) correspond to the instrument body (2) and the leakage detection structure. The heat dissipation structure corresponds to the clamping and fixing structure. The clamping and fixing structure corresponds to the top cover (28). The outer casing (1) is slidably fitted with a lifting structure. The lifting structure and the top cover (28) are equipped with a snap-fit ​​structure and a rotating structure. The lower side of the outer casing (1) is equipped with a support structure. The support structure corresponds to the lifting structure. The support structure and the lifting structure are equipped with a locking structure. The inner surface has multiple first sliding grooves (10), and the lifting structure includes multiple first support rods (11) and second support rods (12). The first sliding grooves (10) correspond to the first support rods (11) and the second support rods (12). The support structure includes multiple telescopic rods (16), and the locking structure includes screws (14) fixed on the telescopic rods (16). Threaded grooves (13) are provided in both the first support rods (11) and the second support rods (12). The threaded grooves (13) correspond to the screws (14). Multiple grooves (15) are provided at the bottom of the outer shell (1). The grooves (15) correspond to the telescopic rods (16). The telescopic rods (16) include a first rod body (17) and a second rod body (18). The first rod body (17) has multiple openings. There is a second sliding groove (22), which corresponds to the second rod (18). A first spring (23) and a damping block are installed between the second rod (18) and the groove wall of the second sliding groove (22). A limit plate (19) is fixed at the end of the second rod (18). The limit plate (19) is rotatably connected to the groove wall of the groove (15). A rotating groove corresponding to the limit plate (19) is opened in the groove (15). The limit plate (19) is fixedly connected to the screw (14). A plurality of first slots (20) are opened in the groove (15). A plurality of first blocks (21) are fixed on the periphery of the first rod (17). The plurality of first slots (20) are arranged in two layers, one above the other. The first blocks (21) are annular structures. The first locking block (21) rotates within the first locking groove (20) and is made of rubber. The clamping and fixing structure includes a heat-conducting plate (3) and an upper clamping plate (31) fixed inside the outer shell (1). The upper clamping plate (31) has a U-shaped structure. The instrument body (2) is placed between the heat-conducting plate (3) and the upper clamping plate (31). The heat-conducting plate (3) is in contact with the bottom of the instrument body (2). A third sliding groove (33) is provided in the upper clamping plate (31). A sliding plate (32) is slidably fitted in the third sliding groove (33). Multiple second springs (34) are fixed between the sliding plate (32) and the third sliding groove (33). The sliding plate (32) has a U-shaped structure. Multiple third locking blocks (35) are fixed at the ends of the sliding plate (32).A first slot (29) is provided inside the top cover (28). A rod (30) is fixed on the slide plate (32). The rod (30) corresponds to the first slot (29). Multiple fourth slots (36) are provided inside the first slot (29). Multiple fifth slots (37) are provided inside the third slide groove (33). The fourth slots (36) and fifth slots (37) correspond to the third locking block (35).

2. The DC multi-point grounding fault finder according to claim 1, characterized in that: The snap-fit ​​structure includes a second snap block (24) fixed to the end of the first support rod (11), and a second snap groove (25) is provided in the top cover (28), the second snap groove (25) corresponding to the second snap block (24).

3. The DC multi-point grounding fault finder according to claim 1, characterized in that: The rotating structure includes a rotating frame (26) fixed to the end of the second support rod (12), a rotating shaft (27) fixed inside the rotating frame (26), the rotating shaft (27) being rotatably connected to the top cover (28), and the leakage detection structure includes an electromagnetic induction sensor (9) fixed to the top cover (28).

4. The DC multi-point grounding fault finder according to claim 1, characterized in that: The heat dissipation structure includes multiple heat sinks (4) fixed on the lower side of the heat conduction plate (3). The heat sinks (4) are located above the battery (5) and in contact with the battery (5). An air inlet (6) is provided at the bottom of the outer casing (1). An air outlet (7) is provided on both sides of the outer casing (1). The air outlet (7) is located on the side of the heat sink (4). A blower (8) is fixed inside the air inlet (6).

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