A leakage detection device for high-voltage transmission lines

Abstract

The present invention discloses a leakage detection device for high-voltage transmission lines, which includes a magnetic core body and a wire body. A plurality of main winding components for generating a magnetic field are arranged on the outer surface of the magnetic core body. The main winding components include main magnetic poles installed on the outer surface of the magnetic core body. The wire body is installed inside the main magnetic poles. A plurality of coil groups are wound around the outer surface of the main magnetic poles. An adjusting mechanism is arranged on the outer surface of the main magnetic poles. The adjusting mechanism includes a long plate installed on the outer surface of the magnetic core body. A second motor is fixedly installed at the bottom end of the long plate. The output shaft of the second motor is fixedly connected with a screw rod. By arranging a plurality of bump components on the outer surface of the main winding components in the present invention, these bumps can be inserted between the coils, thereby conveniently adjusting the spacing between the coils, enabling the device to flexibly adjust the coil layout according to the characteristics of different transmission lines and detection requirements, optimizing the electromagnetic induction area, and further improving the detection accuracy and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage detection, and particularly relates to a leakage detection device for high-voltage transmission lines. Background Art

[0002] In the power system, the safe operation of high-voltage transmission lines is of crucial importance. However, due to environmental factors, equipment aging, or defects during the installation process, leakage sometimes occurs in the transmission lines. This not only causes energy loss but may also trigger serious safety accidents such as fires and electric shocks. Therefore, timely and accurate leakage detection of high-voltage transmission lines is an important measure to ensure the stable operation of the power system.

[0003] Among traditional detection methods, there is the electromagnetic induction method. When an electric current flows through a wire, a magnetic field will be generated around it, and the leakage current will cause a change in the magnetic field. By detecting the change in the magnetic field, it is possible to indirectly determine whether there is a leakage in the wire. However, due to the complexity of high-voltage transmission lines, it is often difficult to adapt to various complex environments, resulting in the detection accuracy and reliability being affected. Secondly, traditional detection devices often have insufficient sensitivity when detecting tiny leakage currents and it is difficult to accurately judge the leakage situation. Summary of the Invention

[0004] The purpose of the present invention is to provide a leakage detection device for high-voltage transmission lines to solve the problem of insufficient sensitivity and difficulty in accurately judging the leakage situation when detecting tiny leakage currents as mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A leakage detection device for high-voltage transmission lines, including a magnetic core body and a wire body. A plurality of main winding components for generating a magnetic field are arranged on the outer surface of the magnetic core body. The main winding components include main magnetic poles installed on the outer surface of the magnetic core body. The wire body is installed inside the main magnetic poles. A plurality of coil groups are wound around the outer surface of the main magnetic poles. An adjusting mechanism is arranged on the outer surface of the main magnetic poles. The adjusting mechanism includes a long plate installed on the outer surface of the magnetic core body. A second motor is fixedly installed at the bottom end of the long plate. The output shaft of the second motor is fixedly connected to a screw rod. The screw rod is provided with two thread sleeves with opposite threads. A first soft plate and a second soft plate with moving rods for isolating magnetic field deviation are sleeved on the outer surface of the main magnetic poles. The two moving rods are respectively fixedly connected to the two thread sleeves. A plurality of bump components for adjusting the coil spacing are fixedly installed on the inner walls of the first soft plate and the second soft plate.

[0006] As a preferred technical solution of the present invention, the bump assembly includes a bump body installed on the inner walls of the first flexible board and the second flexible board. The cross-section of the bump body is trapezoidal. Activated carbon for adsorbing water vapor is added to the inner cavity of the bump body. A protective pad is installed on the outer surface of the bump body, and a plurality of ventilation holes are provided on the outer surface of the bump body.

[0007] As a preferred technical solution of the present invention, the main magnetic pole is fixed on the outer surface of the magnetic core body through a push rod. The main magnetic pole is composed of two semi-circular magnetic pole plates combined. An annular detection frame for concentrating the magnetic field is installed on the inner wall of the main magnetic pole. A plurality of detection ends for detecting electric leakage are installed on the inner wall of the annular detection frame, and a damping member for suppressing oscillation and improving detection accuracy is provided between the detection ends and the annular detection frame.

[0008] As a preferred technical solution of the present invention, a reinforcing rib assembly is provided inside the main magnetic pole. The reinforcing rib assembly includes an annular cavity opened inside the main magnetic pole. A partition board is installed inside the annular cavity. A plurality of metal pickup pieces for enhancing magnetic field change are installed on the surface of the partition board. The metal pickup pieces are arranged between the inner coils of the coil group.

[0009] As a preferred technical solution of the present invention, a magnetization mechanism is provided on the outer surface of the magnetic core body. The magnetization mechanism includes a moving board installed on the outer surface of the magnetic core body. An end board is slidably installed on the outer surface of the moving board. An annular support plate is provided at the top end of the end board. A secondary winding for increasing additional current is fixedly installed inside the annular support plate. An annular sliding board is fixedly installed on the outer surface of the annular support plate. The annular sliding board is slidably installed inside the end board.

[0010] As a preferred technical solution of the present invention, the coils on the surface of the secondary winding are arranged in an interleaved manner with the coils on the outer surface of the main winding assembly. The two secondary windings are symmetrically arranged at both ends of the main winding assembly.

[0011] As a preferred technical solution of the present invention, a plate discharging mechanism is provided on the outer surface of the main magnetic pole. The plate discharging mechanism includes a fixing frame installed on the outer surface of the main magnetic pole. A support shaft is fixedly installed at the bottom end of the fixing frame. A round rod is rotatably installed inside the support shaft. A main gear is provided on the outer surface of the round rod. A plurality of grooves are opened on the outer surface of the annular sliding board. The main gear is engaged inside the grooves. A second bevel gear is fixedly installed at the free end of the round rod. A third motor is fixedly installed at the top end of the fixing frame. A first bevel gear is fixedly installed on the output shaft of the third motor. The first bevel gear and the second bevel gear are engaged. Baffle plates for protecting the plate discharging mechanism are fixedly installed on both sides of the fixing frame.

[0012] As a preferred technical solution of the present invention, an electric push rod is fixedly installed inside the fixing frame. A limiting plate for limiting the main gear is slidably installed on the surface of the round rod. The limiting plate slidably penetrates through the main gear, and the output shaft of the electric push rod located inside the round rod is fixedly connected to the limiting plate.

[0013] As a preferred technical solution of the present invention, an elastic protection plate for protecting the main winding assembly and the secondary winding is installed on the outer surface of the magnetic core body, and both the main winding assembly and the secondary winding are arranged inside the elastic protection plate.

[0014] As a preferred technical solution of the present invention, a limiting mechanism is arranged on the outer surface of the magnetic core body. The limiting mechanism includes a support frame fixedly installed on the outer surface of the magnetic core body. Both ends of the support frame are fixedly installed with frames. A first roller and a second roller are rotatably installed inside the frames. A belt is drivingly installed between the first roller and the second roller. A first motor is fixedly installed on the outer surface of the frame, and the output shaft of the first motor is fixedly connected to one end of the second roller, and the wire body is located between the first roller and the second roller.

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

[0016] 1. By arranging a plurality of bump assemblies on the outer surface of the main winding assembly, these bumps can be inserted between the coils, so as to conveniently adjust the spacing between the coils. This design enables the device to flexibly adjust the coil layout according to the characteristics and detection requirements of different transmission lines, optimize the electromagnetic induction area, and further improve the detection accuracy and reliability.

[0017] 2. Through the electromagnetic induction area formed by the main winding assembly and the secondary winding, the leakage signal in the wire can be accurately captured. The main winding generates an initial magnetic field, and the secondary winding is used to amplify the weak magnetic field change caused by leakage, thereby improving the detection sensitivity. This design enables the device to accurately identify tiny leakage currents and reduces the missed detection rate.

[0018] 3. By arranging a row plate mechanism and an adjustment mechanism, precise adjustment of the angle and position of the secondary winding can be achieved. This design enables the secondary winding to adjust its position and angle relative to the main winding as needed, so as to maximize the amplification of the leakage signal and improve the detection effect. At the same time, this also enhances the adaptability of the device to different environments and transmission lines.

[0019] 4. By arranging a reinforcing rib assembly inside the main magnetic pole, the stability and strength of the structure are enhanced. This design enables the device to withstand greater electromagnetic force and mechanical stress, improves the durability and service life. At the same time, the metal pickup pieces in the reinforcing rib assembly can also enhance the magnetic field change and further improve the detection performance. Brief Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the elastic protection plate of the present invention;

[0022] Figure 3 is a schematic diagram of the structure of the limit mechanism of the present invention;

[0023] Figure 4 is a schematic diagram of the structure of the adjustment mechanism of the present invention;

[0024] Figure 5 is a schematic diagram of the combined structure of the first flexible plate and the second flexible plate of the present invention;

[0025] Figure 6 is a schematic diagram of the cross-sectional structure of the bump assembly of the present invention;

[0026] Figure 7 is a schematic diagram of the structure of the main winding assembly of the present invention;

[0027] Figure 8 is a schematic diagram of the structure of the damping member of the present invention;

[0028] Figure 9 is a schematic diagram of the internal structure of the main magnetic pole of the present invention;

[0029] Figure 10 is a schematic diagram of the internal structure of the elastic protection plate of the present invention;

[0030] Figure 11 is a schematic diagram of the structure of the fixing bracket of the present invention;

[0031] Figure 12 is a schematic diagram of the structure of the secondary winding of the present invention;

[0032] Figure 13 is a schematic diagram of the internal structure of the round rod of the present invention;

[0033] Figure 14 is a schematic diagram of the structure of the annular sliding plate of the present invention.

[0034] In the figure: 1. Magnetic core body; 2. Wire body; 3. Limiting mechanism; 31. Frame; 32. First roller; 33. Second roller; 34. First motor; 35. Belt; 36. Support frame; 4. Main winding assembly; 41. Main magnetic pole; 42. Coil group; 43. Ring-shaped detection frame; 44. Damping member; 45. Detection end; 46. Reinforcement assembly; 461. Ring-shaped cavity; 462. Partition; 463. Metal pickup piece; 47. Thrust rod; 5. Adjusting mechanism; 51. Long plate; 52. Second motor; 53. Screw rod; 54. Moving rod; 55. Threaded sleeve; 56. First flexible plate; 57. Second flexible plate; 58. Bump assembly; 581. Bump body; 582. Protective pad; 583. Vent hole; 584. Activated carbon; 6. Magnetizing mechanism; 61. Secondary winding; 62. Ring-shaped support plate; 63. Ring-shaped sliding plate; 64. End plate; 65. Moving plate; 7. Plating arrangement mechanism; 71. Fixed frame; 72. First bevel gear; 73. Third motor; 74. Second bevel gear; 75. Support shaft; 76. Main gear; 77. Limiting plate; 78. Round rod; 79. Electric push rod; 710. Baffle; 8. Elastic protection plate. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] Please refer to Figures 1-14 , the present invention provides a leakage detection device for high-voltage transmission lines, including a magnetic core body 1 and a wire body 2. A plurality of main winding assemblies 4 for generating a magnetic field are arranged on the outer surface of the magnetic core body 1. The main winding assembly 4 includes a main magnetic pole 41 installed on the outer surface of the magnetic core body 1. The wire body 2 is installed inside the main magnetic pole 41, and a plurality of coil groups 42 are wound around the outer surface of the main magnetic pole 41.

[0037] Among them, the magnetic core body 1 serves as the core component of the magnetic field, concentrating and guiding the magnetic field to improve the magnetic induction intensity; when high-voltage electric energy is transmitted through the line, the wire body 2 will generate an alternating magnetic field; the wire body 2 can introduce the magnetic field generated by the line into the detection device and guide it to the main winding assembly 4; the main winding assembly 4 guides the induced current to the coil group 42 through a series of main magnetic poles 41 installed on the surface of the magnetic core body 1, generating a larger induced current and improving the intensity of the leakage signal.

[0038] In the technical solution of the embodiment of the present application, an adjusting mechanism 5 is provided on the outer surface of the main magnetic pole 41. The adjusting mechanism 5 includes a long plate 51 installed on the outer surface of the magnetic core body 1. A second motor 52 is fixedly installed at the bottom end of the long plate 51. The output shaft of the second motor 52 is fixedly connected to a screw rod 53. Two threaded sleeves 55 with opposite threads are provided on the screw rod 53. A first soft plate 56 and a second soft plate 57 for isolating magnetic field deviation and having moving rods 54 are sleeved on the outer surface of the main magnetic pole 41. The two moving rods 54 are respectively fixedly connected to the two threaded sleeves 55. A plurality of bump assemblies 58 for adjusting the coil pitch are fixedly installed on the inner walls of the first soft plate 56 and the second soft plate 57.

[0039] Among them, by starting the second motor 52, the second motor 52 drives the screw rod 53 to rotate. Due to the two opposite threads provided on the outer surface of the screw rod 53, the rotation of the screw rod 53 will drive the two threaded sleeves 55 to move towards each other. At this time, the two threaded sleeves 55 respectively drive the first soft plate 56 and the second soft plate 57 to move. And when the first soft plate 56 and the second soft plate 57 approach each other, the bump assemblies 58 installed on their surfaces will be moved, so that the bump assemblies 58 move into the coils on the surface of the main magnetic pole 41, thereby adjusting the coil pitch, enabling the device to flexibly adjust the coil layout according to the characteristics of different transmission lines and detection requirements, optimizing the electromagnetic induction area, and further improving the detection accuracy and reliability.

[0040] In some other embodiments, the bump assembly 58 includes a bump body 581 installed on the inner walls of the first soft plate 56 and the second soft plate 57. The cross-section of the bump body 581 is trapezoidal. Activated carbon 584 for adsorbing water vapor is added to the inner cavity of the bump body 581. A protective pad 582 is installed on the outer surface of the bump body 581. A plurality of ventilation holes 583 are provided on the outer surface of the bump body 581.

[0041] Among them, the activated carbon 584 inside the bump body 581 can adsorb the water vapor inside the main magnetic pole 41, thereby ensuring the dryness inside the main winding assembly 4. The adjustment of the coil pitch by the bump body 581 will change the inductance value of the coil and the distribution of the electromagnetic field, thereby affecting the effect of the filter circuit, so as to reduce interference signals such as high-frequency noise; the protective pad 582 can also reduce the frictional damage between the bump body 581 and the coil.

[0042] In some other embodiments, the main magnetic pole 41 is fixed on the outer surface of the magnetic core body 1 through a top rod 47. The main magnetic pole 41 is composed of two semi-circular magnetic pole plates. An annular detection frame 43 for concentrating the magnetic field is installed on the inner wall of the main magnetic pole 41. A plurality of detection ends 45 for detecting electric leakage are installed on the inner wall of the annular detection frame 43. And a damping member 44 for suppressing oscillation and improving the detection accuracy is provided between the detection end 45 and the annular detection frame 43.

[0043] Among them, the semi-circular main magnetic pole 41 can facilitate the disassembly and replacement of the main magnetic pole 41 for use; the annular detection frame 43 is installed on the inner wall of the main magnetic pole 41 and is used to concentrate the magnetic field. Since magnetic field lines always tend to form closed loops, the annular detection frame 43 can more effectively capture and concentrate these magnetic field lines, thereby improving the detection sensitivity; when electric leakage occurs, the magnetic field generated by the leakage current will be concentrated by the annular detection frame 43 and guided to the detection end 45, thereby triggering the sensor to generate a signal to detect the electric leakage situation of the current; the damping member 44 is arranged between the detection end 45 and the annular detection frame 43 and is used to suppress oscillation and improve the detection accuracy.

[0044] In some other embodiments, a reinforcing rib assembly 46 is arranged inside the main magnetic pole 41. The reinforcing rib assembly 46 includes an annular cavity 461 opened inside the main magnetic pole 41. A partition plate 462 is installed inside the annular cavity 461. A plurality of metal pickup pieces 463 for enhancing the magnetic field change are installed on the surface of the partition plate 462. The metal pickup pieces 463 are arranged between the internal coils of the coil group 42.

[0045] Among them, the metal pickup pieces 463 can more effectively capture the magnetic field change generated by the transmitting coil. The annular multi-group metal pickup pieces 463 cooperate with the coils to help enhance the sensitivity of the detector; when the cable leaks electricity and enters the detection area, it will cause a change in the magnetic field. This change will be jointly captured by the metal pickup pieces 463 and the receiving coil and converted into an electrical signal for processing.

[0046] In some other embodiments, a magnetic adding mechanism 6 is arranged on the outer surface of the magnetic core body 1. The magnetic adding mechanism 6 includes a moving plate 65 installed on the outer surface of the magnetic core body 1. An end plate 64 is slidably installed on the outer surface of the moving plate 65. An annular support plate 62 is arranged at the top of the end plate 64. A secondary winding 61 for increasing additional current is fixedly installed inside the annular support plate 62. An annular sliding plate 63 is fixedly installed on the outer surface of the annular support plate 62. The annular sliding plate 63 is slidably installed inside the end plate 64.

[0047] Among them, the main winding generates an initial magnetic field, while the secondary winding 61 is used to amplify the weak magnetic field change caused by electric leakage, thereby improving the detection sensitivity. This design enables the device to accurately identify tiny leakage currents and reduces the missed detection rate.

[0048] In some other embodiments, the coils on the surface of the secondary winding 61 are arranged in an interleaved manner with the coils on the outer surface of the main winding assembly 4. The two secondary windings 61 are symmetrically arranged at both ends of the main winding assembly 4.

[0049] Among them, the interleaved secondary windings 61 can cooperate with the coils on the outer surface of the main winding assembly 4 when the secondary windings 61 move, thereby improving the electromagnetic induction intensity and further enhancing the detection effect of tiny currents.

[0050] In some other embodiments, a platen mechanism 7 is provided on the outer surface of the main magnetic pole 41. The platen mechanism 7 includes a fixing frame 71 installed on the outer surface of the main magnetic pole 41. A support shaft 75 is fixedly installed at the bottom end of the fixing frame 71. A round rod 78 is rotatably installed inside the support shaft 75. A main gear 76 is provided on the outer surface of the round rod 78. A plurality of grooves are formed on the outer surface of the annular slide plate 63. The main gear 76 is engaged inside the grooves. A second bevel gear 74 is fixedly installed at the free end of the round rod 78. A third motor 73 is fixedly installed at the top end of the fixing frame 71. A first bevel gear 72 is fixedly installed on the output shaft of the third motor 73. The first bevel gear 72 and the second bevel gear 74 are engaged. Baffles 710 for protecting the platen mechanism 7 are fixedly installed on both sides of the fixing frame 71.

[0051] Among them, by starting the third motor 73, the third motor 73 drives the first bevel gear 72 to rotate, the first bevel gear 72 drives the second bevel gear 74 to rotate, the second bevel gear 74 drives the round rod 78 to rotate, the round rod 78 drives the main gear 76 to rotate, and the main gear 76 rotates through the grooves on the surface of the annular slide plate 63. The rotation of the annular slide plate 63 can drive the secondary winding 61 to rotate, so that the secondary winding 61 can adjust its position and angle relative to the main winding assembly 4 as needed, thereby maximizing the leakage signal and improving the detection effect. At the same time, this also enhances the adaptability of the device to different environments and transmission lines.

[0052] In some other embodiments, an electric push rod 79 is fixedly installed inside the fixing frame 71. A limiting plate 77 for limiting the main gear 76 is slidably installed on the surface of the round rod 78. The limiting plate 77 slidably penetrates through the main gear 76. The output shaft of the electric push rod 79 located inside the round rod 78 is fixedly connected to the limiting plate 77.

[0053] Among them, the electric push rod 79 can drive the limiting plate 77 to move, the limiting plate 77 drives the main gear 76 to move, and the main gear 76 pushes the secondary winding 61 to move, so that the coils on the surface of the secondary winding 61 are in contact with the coils on the surface of the main winding assembly 4, thereby increasing the coil density and adapting to the current detection effect in different environments.

[0054] In some other embodiments, an elastic protection plate 8 for protecting the main winding assembly 4 and the secondary winding 61 is installed on the outer surface of the magnetic core body 1. The main winding assembly 4 and the secondary winding 61 are both arranged inside the elastic protection plate 8.

[0055] Among them, the elastic protection plate 8 can protect the primary winding assembly 4 and the secondary winding 61 from being damaged.

[0056] In some other embodiments, a limiting mechanism 3 is provided on the outer surface of the magnetic core body 1. The limiting mechanism 3 includes a support frame 36 fixedly installed on the outer surface of the magnetic core body 1. Both ends of the support frame 36 are fixedly installed with frames 31. A first roller 32 and a second roller 33 are rotatably installed inside the frame 31. A belt 35 is installed between the first roller 32 and the second roller 33 in a driving manner. A first motor 34 is fixedly installed on the outer surface of the frame 31. The output shaft of the first motor 34 is fixedly connected to one end of the second roller 33, and the wire body 2 is located between the first roller 32 and the second roller 33.

[0057] Among them, by starting the first motor 34, the first motor 34 drives the second roller 33 to rotate. At the same time, the first motor 34 drives the first roller 32 to rotate through the belt 35. At this time, through the action of the first roller 32 and the second roller 33, it is convenient to stably support and limit the wire body 2. The protection and limiting mechanism 3 is equipped to ensure the safety and stability of the operation.

[0058] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A leakage detection device for a high-voltage transmission line, comprising a magnetic core body (1) and a wire body (2), characterized in that: A plurality of main winding components (4) for generating a magnetic field are arranged on the outer surface of the magnetic core body (1). The main winding component (4) includes a main magnetic pole (41) mounted on the outer surface of the magnetic core body (1). The wire body (2) is mounted inside the main magnetic pole (41), and a plurality of coil groups (42) are wound around the outer surface of the main magnetic pole (41). An adjusting mechanism (5) is arranged on the outer surface of the main magnetic pole (41). The adjusting mechanism (5) includes a long plate (51) mounted on the outer surface of the magnetic core body (1). A second motor (52) is fixedly installed at the bottom end of the long plate (51). The output shaft of the second motor (52) is fixedly connected to a screw rod (53). Two thread sleeves (55) with opposite threads are provided on the screw rod (53). A first soft plate (56) and a second soft plate (57) for isolating magnetic field deviation and provided with moving rods (54) are sleeved on the outer surface of the main magnetic pole (41). The two moving rods (54) are respectively fixedly connected to the two thread sleeves (55). A plurality of bump components (58) for adjusting the coil spacing are fixedly installed on the inner walls of the first soft plate (56) and the second soft plate (57).

2. The leakage detection device for high-voltage transmission lines according to claim 1, wherein: The bump component (58) includes a bump body (581) mounted on the inner walls of the first soft plate (56) and the second soft plate (57). The cross section of the bump body (581) is trapezoidal. Activated carbon (584) for adsorbing water vapor is added to the inner cavity of the bump body (581). A protective pad (582) is mounted on the outer surface of the bump body (581), and a plurality of air holes (583) are provided on the outer surface of the bump body (581).

3. The leakage detection device for high-voltage transmission lines according to claim 1, characterized in that: The main magnetic pole (41) is fixed on the outer surface of the magnetic core body (1) through a top rod (47). The main magnetic pole (41) is composed of two semi-circular magnetic pole plates. An annular detection frame (43) for concentrating the magnetic field is mounted on the inner wall of the main magnetic pole (41). A plurality of detection ends (45) for detecting electric leakage are mounted on the inner wall of the annular detection frame (43). A damping member (44) for suppressing oscillation and improving the detection accuracy is arranged between the detection end (45) and the annular detection frame (43).

4. The leakage detection device for high-voltage transmission lines according to claim 3, characterized in that: A reinforcing rib component (46) is arranged inside the main magnetic pole (41). The reinforcing rib component (46) includes an annular cavity (461) opened inside the main magnetic pole (41). A partition plate (462) is mounted inside the annular cavity (461). A plurality of metal pickup pieces (463) for enhancing the magnetic field change are mounted on the surface of the partition plate (462). The metal pickup pieces (463) are arranged between the inner coils of the coil group (42).

5. A leakage detection device for a high-voltage transmission line according to claim 1, characterized in that: A magnetization adding mechanism (6) is arranged on the outer surface of the magnetic core body (1). The magnetization adding mechanism (6) includes a moving plate (65) installed on the outer surface of the magnetic core body (1). An end plate (64) is slidably installed on the outer surface of the moving plate (65). An annular support plate (62) is arranged at the top end of the end plate (64). A secondary winding (61) for increasing additional current is fixedly installed inside the annular support plate (62). An annular sliding plate (63) is fixedly installed on the outer surface of the annular support plate (62). The annular sliding plate (63) is slidably installed inside the end plate (64).

6. The leakage detection device for high-voltage transmission lines according to claim 5, wherein: The coils on the surface of the secondary winding (61) are arranged in a staggered manner with the coils on the outer surface of the main winding assembly (4). The two secondary windings (61) are symmetrically arranged at both ends of the main winding assembly (4).

7. The leakage detection device for high-voltage transmission lines according to claim 5, characterized in that: A plate arranging mechanism (7) is arranged on the outer surface of the main magnetic pole (41). The plate arranging mechanism (7) includes a fixing frame (71) installed on the outer surface of the main magnetic pole (41). A support shaft (75) is fixedly installed at the bottom end of the fixing frame (71). A round rod (78) is rotatably installed inside the support shaft (75). A main gear (76) is arranged on the outer surface of the round rod (78). A plurality of grooves are formed on the outer surface of the annular sliding plate (63). The main gear (76) is engaged inside the grooves. A second bevel gear (74) is fixedly installed at the free end of the round rod (78). A third motor (73) is fixedly installed at the top end of the fixing frame (71). A first bevel gear (72) is fixedly installed on the output shaft of the third motor (73). The first bevel gear (72) and the second bevel gear (74) are engaged. Baffles (710) for protecting the plate arranging mechanism (7) are fixedly installed on both sides of the fixing frame (71).

8. A leakage detection device for a high-voltage transmission line according to claim 7, characterized in that: An electric push rod (79) is fixedly installed inside the fixing frame (71). A limiting plate (77) for limiting the main gear (76) is slidably installed on the surface of the round rod (78). The limiting plate (77) slidably penetrates through the main gear (76). The output shaft of the electric push rod (79) located inside the round rod (78) is fixedly connected to the limiting plate (77).

9. The leakage detection device for high-voltage transmission lines according to claim 1, characterized in that: An elastic protection plate (8) for protecting the main winding assembly (4) and the secondary winding (61) is installed on the outer surface of the magnetic core body (1). The main winding assembly (4) and the secondary winding (61) are both arranged inside the elastic protection plate (8).

10. A leakage detection device for a high-voltage transmission line according to claim 1, characterized in that: A limiting mechanism (3) is arranged on the outer surface of the magnetic core body (1). The limiting mechanism (3) includes a support frame (36) fixedly installed on the outer surface of the magnetic core body (1). Frame (31) is fixedly installed at both ends of the support frame (36). A first roller (32) and a second roller (33) are rotatably installed inside the frame (31). A belt (35) is drivingly installed between the first roller (32) and the second roller (33). A first motor (34) is fixedly installed on the outer surface of the frame (31). The output shaft of the first motor (34) is fixedly connected to one end of the second roller (33), and the wire body (2) is located between the first roller (32) and the second roller (33).

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