Low-voltage electric leakage positioning device and method

Abstract

The invention discloses a low-voltage electric leakage positioning device and method, and relates to the technical field of electric leakage detection.The low-voltage electric leakage positioning device comprises a seat body arranged on a cable in a sleeving mode, the two ends of the seat body are slidably connected with an upper top plate and a lower top plate, the upper top plate can push a lamp holder to move, and the lower top plate can push a lamp holder to move; when the lamp cap is in contact with the lamp holder, the lamp cap can be powered on, and at the moment, the lamp cap and the lamp holder are mutually clamped and can be clamped on the cable. The device is convenient to operate, can detect the electric leakage position of the cable, also can realize the positioning work of the electric leakage position, facilitates the subsequent maintenance work, meets the requirements of intelligent application, and effectively improves the safety and stability of a power system.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage detection, and in particular to a low-voltage leakage positioning device and method. Background Art

[0002] The number of leakage accidents in low-voltage areas has increased dramatically, which not only causes energy waste and affects the stability of power supply, but may even cause danger to personnel and endanger personal safety. Leakage accidents threaten the normal life of residents. Therefore, it is of utmost importance to quickly locate leakage in low-voltage areas and find the leakage fault point in time.

[0003] As the scale of power grids continues to grow, traditional leakage detection instruments often require operators to conduct close-range detection, which is not very safe and has a very low efficiency in locating and troubleshooting faults. If the leakage is serious, there will be certain safety hazards to on-site operators. The complex power grid system places higher demands on patrol technicians.

[0004] For example, the patent with announcement number CN 114184981 B discloses a low-voltage leakage locating device and an offline leakage assessment method, which are used for accurately selecting leakage fault lines in substations and locating leakage fault positions. When the line under test is in a power outage, the host of the low-voltage leakage locator applies a specific voltage to the four-phase lines A, B, C, and N in the substation under test, injects current into the four-phase lines through a current sampling circuit for measurement, and then calculates the resistance value of the line under test, and then measures the ground resistance value of each phase according to a complex leakage model. Finally, the leakage current and the average daily leakage of each phase line of the substation under test are calculated based on the ground resistance values ​​of A, B, C, and N, and a leakage assessment is performed on the substation under test. When the ground resistance value of any phase is less than a threshold value, it is determined that there is a leakage fault in the substation.

[0005] However, this method has the following problems: during detection, it is necessary to measure at a close distance to the cable. If there is leakage in the cable, it will cause potential danger to personnel. At the same time, it is impossible to mark and locate the accurate position of the leakage, which is not convenient for subsequent maintenance work. Summary of the invention

[0006] In order to solve the above problems in the prior art, a low-voltage leakage locating device and method are provided.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] The present invention proposes a low-voltage leakage locating device, comprising a seat body sleeved on a cable, wherein an upper top plate and a lower top plate are slidably connected at both ends of the seat body, the upper top plate can push the lamp head to move, and the lower top plate can push the lamp holder to move; when the lamp head and the lamp holder are in contact, the lamp head can be energized, and at this time the lamp head and the lamp holder are mutually clamped and can be clamped on the cable.

[0009] Preferably, electric push rods are fixedly connected to both ends of the seat body, and the two electric push rods are respectively connected to the upper top plate and the lower top plate, and the upper top plate is connected to a pressure sensor.

[0010] Preferably, it also includes a leakage detection mechanism, and the leakage detection mechanism, the pressure sensor and the electric push rod are connected to a controller. When the leakage detection mechanism detects leakage, the electric push rod is driven to work.

[0011] Preferably, the upper end of the lamp head is connected to a magnet that is attracted to the upper top plate, the magnetic force of the magnet is greater than the gravity of the lamp head, the lower end of the lamp head is provided with a conductive hole, and the lamp holder is slidably connected to a conductive rod that can slide into the conductive hole.

[0012] Preferably, the conductive rod is connected to the lamp holder via a second spring, the conductive rod is provided with a slot, the conductive hole is slidably connected with a latch that can slide into the slot, and the latch is connected to the conductive hole via a third spring.

[0013] Preferably, the lower top plate is slidably connected to a top rod for pushing the conductive rod to move, the top rod is connected to the lower top plate through a first spring, the push rod of the lower electric push rod is fixedly connected to the top rod, and the push rod of the upper electric push rod is fixedly connected to the upper top plate.

[0014] Preferably, the seat body is rotatably connected to a double-rotation screw rod, and nuts are provided at both ends of the double-rotation screw rod. The two nuts are respectively fixedly connected to a bracket, and the bracket is rotatably connected to a walking wheel and a power wheel, and the bracket is connected to a motor that can drive the power wheel to rotate.

[0015] Preferably, the seat body is detachably connected to a cleaning seat, the cleaning seat is rotatably connected to a cleaning brush sleeved on the cable for cable cleaning, and the cleaning seat is connected to a driving motor for driving the cleaning brush to rotate.

[0016] Preferably, both ends of the seat body are further provided with slide grooves, in which a plurality of lamp heads and a plurality of lamp holders are arranged in sequence respectively, a pull rod is slidably connected in the slide groove, the pull rod is connected to the slide groove through a compression spring, and one end of the pull rod passes through the seat body.

[0017] The present invention also proposes a low-voltage leakage locating method, which adopts the above-mentioned low-voltage leakage locating device, including: a plurality of cables are respectively connected with independently set current samplers and GPS locators, the current samplers and GPS locators are connected with a control center, the current samplers are used to detect line current data, and send the current data to a data center, the data center detects the total measured current data of the electricity consumption in the substation at a predetermined frequency, and at the same time summarizes the sub-measured current data transmitted by a plurality of current samplers in the substation;

[0018] The data center performs a current synthesis calculation. If the calculated current value of the synthetic calculation is greater than the first threshold value, and the current difference between the total measured current data and the sum of several sub-measured current data is greater than the second threshold value, or if the calculated current value of the synthetic calculation is less than the first threshold value, and the total measurement device detects that there is an abnormal current in the line, current recording processing is performed and compared with the load characteristic data to determine whether the total measured current data is electricity theft characteristic data or leakage characteristic data. If it is electricity theft characteristic data, it is reported to the control center. If it is leakage characteristic data, based on the GPS locator, the seat of the corresponding line is driven to perform leakage detection on the cable;

[0019] The following steps are involved:

[0020] S1: When the cable leaks electricity, the leakage detection mechanism detects the leakage information and transmits the corresponding signal to the controller. The controller controls the electric push rod to work, and the electric push rod drives the upper top plate and the lower top plate to move toward each other;

[0021] S2: The upper top plate pushes the lamp head to move, and the lower top plate pushes the lamp holder to move, so that the lamp head and the lamp holder move toward the cable. When the pressure sensor detects that the pressure is greater than the threshold, the electric push rod driving the upper top plate stops working;

[0022] S3: As the electric push rod at the bottom continues to move, the top rod pushes the conductive rod to move into the conductive hole. At this time, the lamp head is energized and lights up. At the same time, the latch slides into the slot to limit the conductive rod. At this time, the lamp head and the lamp holder are clamped on the cable to locate the cable leakage.

[0023] S4: The electric push rod drives the upper and lower top plates to reset, the pull rod pushes the new lamp holder to move above the lower top plate, and the new lamp head moves to the bottom of the upper top plate. The new lamp head is adsorbed on the upper top plate by a magnet, thereby carrying out a new round of cable leakage positioning work.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present application is provided with a lamp holder and a lamp head. When leakage is detected, the electric push rod pushes the lamp holder and the lamp head to clamp the cable. At the same time, after the lamp holder and the lamp head are in contact, the lamp head is energized. At this time, the leakage point of the cable can be located and marked. The pull rod can drive the new lamp holder and the lamp head to move to one side of the electric push rod. Multiple positions of the cable can be marked and located. The operation is convenient, which facilitates subsequent maintenance work, meets the needs of intelligent applications, and effectively improves the safety and stability of the power system.

[0026] 2. The present application is provided with a double-rotation screw. When the double-rotation screw rotates, it can drive the bracket to move inward, so that the walking wheels on both sides can clamp the cables. By setting the double-rotation screw, it can clamp cables of different thicknesses, so that it can be suitable for the use of cables of different specifications. The set current clamp and the current receiving body can realize the detection of the leakage position current. At the same time, the set cleaning brush can realize the cleaning of the cable, so as to facilitate the walking work of the device on the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 It is an overall stereogram of the present invention;

[0029] Figure 2 It is the overall front view of the present invention;

[0030] Figure 3 yes Figure 2 Schematic diagram of the structure of the AA part;

[0031] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle BB part;

[0032] Figure 5 yes Figure 3 A magnified view of the K-point structure;

[0033] Figure 6 It is a schematic diagram of the structure of the lamp holder in the present invention;

[0034] Figure 7 It is a schematic diagram of the structure of the lamp holder in the present invention;

[0035] Figure 8 It is a schematic diagram of the structure of the current clamp in the present invention;

[0036] Fig. 9 It is a schematic diagram of the structure of the power receiving body in the present invention.

[0037] Description of reference numerals:

[0038] 1 seat body; 2 electric push rod; 3 upper top plate; 4 first spring; 5 lamp holder; 6 pull rod; 7 lamp head; 8 walking wheel; 9 motor; 10 power wheel; 11 gear; 12 cleaning seat; 13 cleaning brush; 14 current clamp; 15 current receiver; 16 battery; 17 double-rotation screw rod; 18 lower top plate; 19 magnet; 20 conductive rod; 21 second spring; 22 latch; 23 conductive hole; 24 push rod. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] Embodiment 1

[0041] like Figure 1-Figure 9 As shown, this embodiment proposes a low-voltage leakage locating device, including a base body 1 sleeved on the cable, with an upper top plate 3 and a lower top plate 18 slidably connected at both ends of the base body 1, the upper top plate 3 can push the lamp head 7 to move, and the lower top plate 18 can push the lamp holder 5 to move; when the lamp head 7 and the lamp holder 5 are in contact, the lamp head 7 can be powered on, and at this time, the lamp head 7 and the lamp holder 5 are mutually clamped and can be clamped on the cable.

[0042] Electric push rods 2 are fixedly connected to both ends of the base body 1. The two electric push rods 2 are respectively connected to the upper top plate 3 and the lower top plate 18. The upper top plate 3 is connected to a pressure sensor. The electric push rods 2 are arranged in a vertical direction. The two electric push rods 2 are symmetrically arranged on both sides of the cable. The pressure sensor can detect the pressure. When it is detected that the pressure reaches a certain threshold, it indicates that the lamp head 7 and the lamp holder 5 have been engaged on the cable. At this time, the electric push rods 2 can be controlled to stop working to prevent damage to the cable due to excessive force.

[0043] It also includes a leakage detection mechanism. The leakage detection mechanism, the pressure sensor and the electric push rod 2 are connected to a controller. When the leakage detection mechanism detects leakage, the electric push rod 2 is driven to work. The leakage detection mechanism can be specifically an electric pen, or other mechanisms that can realize the leakage detection function.

[0044] The upper end of the lamp holder 7 is connected to a magnet 19 which is attracted to the upper plate 3. The magnetic force of the magnet 19 is greater than the gravity of the lamp holder 7. The magnetic force of the magnet 19 is suitable enough to keep the upper plate 3 and the lamp holder 7 in an adsorbed state to prevent the lamp holder 7 from falling. A conductive hole 23 is provided at the lower end of the lamp holder 7, and the lamp holder 5 is slidably connected to a conductive rod 20 which can slide into the conductive hole 23.

[0045] A power supply is provided in the lamp holder 5, and both ends of the power supply include wires, one end of one wire is connected to the conductive hole 23, and the other wire is connected to the lamp head 7. The lamp head 7 is connected to the conductive rod 20 through the conductive wire. When the conductive rod 20 slides into the conductive hole 23, a complete circuit is formed, the lamp head 7 is energized, and the lamp head 7 lights up, thereby marking the cable position.

[0046] The conductive rod 20 is connected to the lamp holder 5 through the second spring 21. In the initial state, the lower surface of the conductive rod 20 is higher than the lower surface of the lamp holder 5. At this time, the lower top plate 18 supports the lamp holder 5. When the lower top plate 18 moves upward, it drives the lamp holder 5 to rise. At this time, there is a gap between the lower top plate 18 and the conductive rod 20, and the conductive rod 20 will not be driven to move.

[0047] The conductive rod 20 is provided with a slot, and the conductive hole 23 is slidably connected with a pin 22 that can slide into the slot. The pin 22 is connected to the conductive hole 23 through a third spring. The third spring is sleeved on the pin 22. One end of the third spring is connected to the pin 22, and the other end is connected to the conductive hole 23. The lower surface of the pin 22 is an inclined surface, so that the pin 22 can slide into the slot easily, thereby realizing the limiting work of the conductive rod 20.

[0048] The latch 22 is made of iron. When the lamp holder 5 and the lamp head 7 need to be separated, an external small magnet, whose magnetic force is greater than the elastic force of the third spring, can be used to drive the latch 22 out of the slot, thereby moving the conductive rod 20 out. At this time, the lamp holder 5 and the lamp head 7 can be separated.

[0049] The lower top plate 18 is slidably connected with a top rod 24 for pushing the conductive rod 20 to move. The top rod 24 is connected to the lower top plate 18 through a first spring 4. The push rod of the lower electric push rod 2 is fixedly connected to the top rod 24, and the push rod of the upper electric push rod 2 is fixedly connected to the upper top plate 3.

[0050] The first spring 4 is sleeved on the top rod 24, the upper end of the first spring 4 is connected to the lower top plate 18, and the lower end is connected to the top rod 24. The elastic force of the first spring 4 is suitable enough, so that when the electric push rod 2 pushes the top rod 24 to move, the lower top plate 18 can be driven to move by the first spring 4, and the lower top plate 18 pushes the lamp holder 5 to rise.

[0051] In the initial state, the upper surface of the top rod 24 is lower than the upper surface of the lower top plate 18, so the lower top plate 18 drives the lamp holder 5 to move. When the lamp holder 5 and the lamp head 7 clamp the cable, the lower top plate 18 cannot move further, but the top rod 24 continues to move. At this time, the top rod 24 can push the conductive rod 20 to move, so that the conductive rod 20 moves into the conductive hole 23, thereby realizing the power supply of the lamp holder 5 and the lamp head 7.

[0052] The seat body 1 is rotatably connected to a double-rotation screw rod 17, and nuts are arranged at both ends of the double-rotation screw rod 17. The double-rotation screw rod 17 includes two spiral sections with opposite rotation directions, and two nuts are respectively arranged on the two spiral sections. Therefore, when the double-rotation screw rod 17 rotates, the two nuts can be driven to move inward or outward at the same time.

[0053] The two nuts are respectively fixedly connected to the bracket, the bracket is rotatably connected to the walking wheel 8 and the power wheel 10, the bracket is connected to the motor 9 which can drive the power wheel 10 to rotate, and several power wheels 10 can be provided according to actual needs. The motor 9 is fixedly connected to the bracket, and the output shaft of the motor 9 is fixedly connected to the power wheel 10. The motor 9 can drive the power wheel 10 to rotate, thereby driving the seat body 1 to walk on the cable.

[0054] The seat body 1 is connected to a battery 16 for powering the entire device, and the seat body 1 is detachably connected to a cleaning seat 12. The cleaning seat 12 is rotatably connected to a cleaning brush 13 mounted on the cable for cable cleaning. The cleaning seat 12 is connected to a driving motor for driving the cleaning brush 13 to rotate. The cleaning brush 13 is fixedly mounted with a gear ring, and the driving motor is connected to a gear 11. The gear 11 and the gear ring are meshed. The driving motor can drive the cleaning brush 13 to rotate around the cable, thereby realizing the cleaning of the cable, making it convenient for the subsequent seat body 1 to move along the surface of the cable.

[0055] Slide grooves are also provided at both ends of the base body 1. A plurality of lamp heads 7 and a plurality of lamp holders 5 are arranged in sequence in the two slide grooves respectively. A pull rod 6 is slidably connected in the slide groove. The pull rod 6 is connected to the slide groove through a compression spring, and one end of the pull rod 6 passes through the base body 1.

[0056] The compression spring is sleeved on the pull rod 6, one end of the compression spring is connected to the pull rod 6, and the other end is connected to the slide groove. Under the action of the compression spring, the pull rod 6 can be driven towards the direction close to the electric push rod 2, thereby driving the new lamp holder 5 and the lamp head 7 to move to the side of the electric push rod 2. The cable can be marked and positioned at multiple positions, which is easy to operate and facilitates subsequent maintenance work. It meets the needs of intelligent applications and effectively improves the safety and stability of the power system.

[0057] Embodiment 2

[0058] Reference Figure 1-Figure 9 The other structures are the same as those of the first embodiment, except that the leakage detection mechanism includes a current clamp 14 and a current receiver 15, the current receiver 15 is located between the current clamp 14 and the cleaning brush 13, and the current clamp 14 and the current receiver 15 are connected to a controller.

[0059] The current clamp 14 includes a left current clamp body and a right current clamp body, both of which are rotatably connected to the base body 1, and a first torsion spring is connected between the left current clamp body and the right current clamp body. The current clamp 14 can be clamped on the cable through the first torsion spring.

[0060] The power receiver 15 includes a left power receiver and a right power receiver, both of which are rotatably connected to the base 1, and a first torsion spring is connected between the left power receiver and the right power receiver. The power receiver 15 can be clamped on the cable by a second torsion spring.

[0061] Generally speaking, leakage will cause the current to increase. Leakage refers to the phenomenon that the insulation of electrical equipment or lines is damaged or broken, causing the current to flow outside the insulation. Leakage phenomena are usually divided into two types: direct electric shock and indirect electric shock. Generally speaking, leakage will cause the current to increase because leakage causes the current to pass through a shorter loop, the resistance becomes smaller, and the current will increase.

[0062] In the case of a wire leakage, the current before and after the leakage position will change significantly. When leakage occurs, the current will flow to the ground through the leakage point, causing the current after the leakage position to decrease, while the current before the leakage position remains unchanged.

[0063] If the cable head is not grounded, high voltage will appear around the cable head. This is because the air around the cable head will be affected by the electric field, forming a high voltage area. If the human body touches this high voltage area, it will cause current to flow through the human body, causing electric shock. Therefore, the cable head is not grounded, which is one of the reasons for the discharge phenomenon.

[0064] Tip discharge is a discharge phenomenon that occurs at the sharp part of an object under the action of a strong electric field. It is a type of corona discharge. The tip of a conductor has a large number of equipotential surfaces. Under the action of a strong electric field, the equipotential surfaces are dense at places with large surface curvature (such as the top of a sharp or small object), and the electric field strength increases dramatically, causing the air near it to be ionized and produce gas discharge. This phenomenon is called corona discharge.

[0065] Tip discharge is a type of corona discharge, specifically referring to the phenomenon of gas discharge caused by ionization of air near the tip. Tip discharge occurs when the electric field near the tip is particularly strong. Therefore, the current is induced by the set current receiver 15, and the current is guided into the current clamp 14 under the action of the current receiver 15. After the current is induced by the set current clamp 14, a corresponding change occurs, and then the controller controls the electric push rod 2 to work, so as to mark the leakage position.

[0066] A low-voltage leakage locating method, using the above-mentioned low-voltage leakage locating device, comprises the following steps:

[0067] S1: When the cable leaks electricity, the leakage detection mechanism detects the leakage information and transmits the corresponding signal to the controller. The controller controls the electric push rod 2 to work, and the electric push rod 2 drives the upper top plate 3 and the lower top plate 18 to move toward each other;

[0068] S2: The upper top plate 3 pushes the lamp head 7 to move, and the lower top plate 18 pushes the lamp holder 5 to move, so that the lamp head 7 and the lamp holder 5 move in the direction close to the cable. When the pressure sensor detects that the pressure is greater than the threshold, the electric push rod 2 driving the upper top plate 3 stops working;

[0069] S3: As the electric push rod 2 at the bottom continues to move, the top rod 24 pushes the conductive rod 20 to move, so that the conductive rod 20 moves into the conductive hole 23. At this time, the lamp head 7 is energized and lights up. At the same time, the latch 22 slides into the latch slot to limit the conductive rod 20. At this time, the lamp head 7 and the lamp holder 5 are clamped on the cable to locate the cable leakage.

[0070] S4: The electric push rod 2 drives the upper top plate 3 and the lower top plate 18 to reset, the pull rod 6 pushes the new lamp holder 5 to move to the top of the lower top plate 18, and the new lamp head 7 moves to the bottom of the upper top plate 3. The new lamp head 7 is adsorbed on the upper top plate 3 through the magnet 19, thereby carrying out a new round of cable leakage positioning work.

[0071] In S3, the electric push rod 2 located at the bottom drives the lower top plate 18 to move through the first spring 4. During the process of driving the lower top plate 18 to move, the lower top plate 18 first directly drives the lamp holder to rise. At this time, the lower top plate 18 will not contact the conductive rod 20, so the conductive rod 20 will not move. When the lamp holder 5 and the lamp head 7 clamp the cable, the lower top plate 18 cannot continue to move. As the push rod drives the top rod 24 to continue to rise, the first spring 4 is deformed, and the top rod 24 drives the conductive rod 20 to move upward, so that the conductive rod 20 slides into the conductive hole 23, thereby achieving the coordination between the lamp head 7 and the lamp holder 5.

[0072] Several cables are respectively connected to independently set current samplers and GPS locators, and the current samplers and GPS locators are connected to the control center. The current samplers are used to detect line current data and send the current data to the data center. The data center detects the total measured current data of the electricity consumption in this substation at a predetermined frequency, and at the same time summarizes the measured current data transmitted by several current samplers in this substation.

[0073] The data center performs current synthesis calculation. If the calculated current value of the synthetic calculation is greater than the first threshold value, and the current difference between the total measured current data and the sum of several sub-measured current data is greater than the second threshold value, or if the calculated current value of the synthetic calculation is less than the first threshold value, and the total measurement device detects that there is abnormal current in the line, current recording processing is performed and compared with the load characteristic data to determine whether the total measured current data is electricity theft characteristic data or leakage characteristic data. If it is electricity theft characteristic data, it is reported to the control center. If it is leakage characteristic data, based on the GPS locator, the seat body 1 of the corresponding line is driven to perform leakage detection on the cable.

[0074] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A low-voltage leakage locating device, comprising a seat (1) sleeved on a cable, characterized in that: An upper top plate (3) and a lower top plate (18) are slidably connected at both ends of the base body (1); the upper top plate (3) can push the lamp head (7) to move, and the lower top plate (18) can push the lamp holder (5) to move; when the lamp head (7) and the lamp holder (5) are in contact, the lamp head (7) can be powered on, and at this time, the lamp head (7) and the lamp holder (5) are mutually engaged and can be clamped on the cable.

2. A low voltage leakage locating device according to claim 1, characterized in that: Electric push rods (2) are fixedly connected to both ends of the seat body (1), and the two electric push rods (2) are respectively connected to an upper top plate (3) and a lower top plate (18), and the upper top plate (3) is connected to a pressure sensor.

3. A low voltage leakage locating device according to claim 2, characterized in that: It also includes a leakage detection mechanism. The leakage detection mechanism, the pressure sensor and the electric push rod (2) are connected to a controller. When the leakage detection mechanism detects leakage, the electric push rod (2) is driven to work.

4. A low voltage leakage locating device according to claim 3, characterized in that: The upper end of the lamp holder (7) is connected to a magnet (19) which is attracted to the upper top plate (3), the magnetic force of the magnet (19) is greater than the gravity of the lamp holder (7), the lower end of the lamp holder (7) is provided with a conductive hole (23), and the lamp holder (5) is slidably connected to a conductive rod (20) which can slide into the conductive hole (23).

5. A low voltage leakage locating device according to claim 4, characterized in that: The conductive rod (20) is connected to the lamp holder (5) via a second spring (21); a slot is provided on the conductive rod (20); a latch pin (22) is slidably connected to the conductive hole (23) and can slide into the slot; and the latch pin (22) is connected to the conductive hole (23) via a third spring.

6. A low voltage leakage locating device according to claim 5, characterized in that: The lower top plate (18) is slidably connected to a top rod (24) for pushing the conductive rod (20) to move; the top rod (24) is connected to the lower top plate (18) via a first spring (4); the push rod of the lower electric push rod (2) is fixedly connected to the top rod (24); and the push rod of the upper electric push rod (2) is fixedly connected to the upper top plate (3).

7. A low voltage leakage locating device according to claim 1, characterized in that: The seat body (1) is rotatably connected to a double-rotation screw rod (17), and screw nuts are provided at both ends of the double-rotation screw rod (17). The two screw nuts are respectively fixedly connected to a bracket, and the bracket is rotatably connected to a walking wheel (8) and a power wheel (10). The bracket is connected to a motor (9) that can drive the power wheel (10) to rotate.

8. A low voltage leakage locating device according to claim 1, characterized in that: The seat body (1) is detachably connected to a cleaning seat (12), the cleaning seat (12) is rotatably connected to a cleaning brush (13) sleeved on the cable for cleaning the cable, and the cleaning seat (12) is connected to a driving motor for driving the cleaning brush (13) to rotate.

9. A low voltage leakage locating device according to claim 1, characterized in that: The base body (1) is also provided with slide grooves at both ends, and a plurality of lamp heads (7) and a plurality of lamp holders (5) are arranged in sequence in the two slide grooves respectively. A pull rod (6) is slidably connected in the slide groove, and the pull rod (6) is connected to the slide groove through a compression spring, and one end of the pull rod (6) passes through the base body (1).

10. A low voltage leakage locating method, characterized in that: A low-voltage leakage locating device according to any one of claims 6 to 9 is adopted, comprising: a plurality of cables respectively connected with independently arranged current samplers and GPS locators, the current samplers and GPS locators are connected with a control center, the current samplers are used to detect line current data, and send the current data to a data center, the data center detects the total measured current data of the electricity consumption in the substation at a predetermined frequency, and at the same time summarizes the sub-measured current data transmitted by a plurality of current samplers in the substation; The data center performs a current synthesis calculation. If the calculated current value of the synthetic calculation is greater than a first threshold value, and the current difference between the total measured current data and the sum of several sub-measured current data is greater than a second threshold value, or if the calculated current value of the synthetic calculation is less than the first threshold value, and the total measurement device detects that there is an abnormal current in the line, current recording processing is performed and compared with the load characteristic data to determine whether the total measured current data is electricity theft characteristic data or leakage characteristic data. If it is electricity theft characteristic data, it is reported to the control center. If it is leakage characteristic data, based on the GPS locator, the seat body (1) of the corresponding line is driven to perform leakage detection on the cable; The following steps are involved: S1: When the cable has leakage, the leakage detection mechanism detects the leakage information and transmits the corresponding signal to the controller, and the controller controls the electric push rod (2) to work, and the electric push rod (2) drives the upper top plate (3) and the lower top plate (18) to move towards each other; S2: the upper top plate (3) pushes the lamp head (7) to move, and the lower top plate (18) pushes the lamp holder (5) to move, so that the lamp head (7) and the lamp holder (5) move in a direction close to the cable, and when the pressure sensor detects that the pressure is greater than a threshold value, the electric push rod (2) driving the upper top plate (3) stops working; S3: As the electric push rod (2) located below continues to move, the top rod (24) pushes the conductive rod (20) to move, so that the conductive rod (20) moves into the conductive hole (23). At this time, the lamp head (7) is energized and the lamp head (7) lights up. At the same time, the latch (22) slides into the latch slot to limit the conductive rod (20). At this time, the lamp head (7) and the lamp holder (5) are clamped on the cable to locate the leakage of the cable. S4: The electric push rod (2) drives the upper top plate (3) and the lower top plate (18) to reset, the pull rod (6) pushes the new lamp holder (5) to move above the lower top plate (18), and the new lamp head (7) moves to below the upper top plate (3). The new lamp head (7) is adsorbed on the upper top plate (3) by the magnet (19), thereby carrying out a new round of cable leakage positioning work.

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