Power cable partial discharge monitoring equipment and method

Abstract

The invention belongs to the technical field of power cables, and particularly relates to power cable partial discharge monitoring equipment and method.The power cable partial discharge monitoring equipment comprises a detector, a mounting frame is fixedly connected to the top end of the detector, a mounting opening is formed in the outer wall of the mounting frame, and a mounting door is hinged to the inner wall of the mounting opening; the outer wall of the mounting door and the outer wall of the mounting frame are jointly provided with a sliding groove, and the inner wall of the sliding groove is slidably connected with a sliding block. After the device is fixed, the device can move on the surface of a cable, partial discharge detection can be performed on the cable while the device moves, the surface of the cable can be cleaned while detection is performed, the surface of the cable is cleaned in the moving process, and the detection efficiency is improved. According to the partial discharge detection device, dust, dirt or other impurities can be removed, interference between the surface of the cable and the partial discharge detection device can be reduced, the detection accuracy and reliability are improved, manual hand holding is not needed any more, and automatic movement and detection can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of power cables, and in particular relates to a power cable partial discharge monitoring device and method. Background Art

[0002] With the rapid growth of electricity demand and the rapid expansion of power grids, society has higher and higher requirements for the reliability of power grid power supply. Partial discharge is one of the main causes of power cable insulation degradation and failure. Early detection of cable insulation defects can effectively avoid faults and ensure reliable operation of equipment. Therefore, partial discharge online monitoring devices have become an important part of the comprehensive online monitoring system for high-voltage cables.

[0003] Existing partial discharge detection of running cables usually requires inspectors to move a handheld detector along the cable line, and the handheld detector requires personnel to move along the cable line, which may result in limited coverage. Especially for longer cable lines, moving the handheld detector requires a longer time and more human resources. The handheld detector needs to be operated by personnel, which may be affected by human factors, such as personnel fatigue, unstable movement speed or inaccurate operation, etc. These factors may affect the accuracy and reliability of partial discharge detection, and may also put the lives of workers in danger.

[0004] To this end, we propose power cable partial discharge monitoring equipment and methods to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a power cable outer sheath defect detection device and a detection method in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a power cable partial discharge monitoring device, comprising a detector, a top of the detector is fixedly connected with a mounting frame, an outer wall of the mounting frame is provided with a mounting opening, an inner wall of the mounting opening is hinged with a mounting door, an outer wall of the mounting door and an outer wall of the mounting frame are jointly provided with a sliding groove, an inner wall of the sliding groove is slidably connected with a sliding block, a bottom end of the sliding block is fixedly connected with a first electromagnetic telescopic rod, a top end of the first electromagnetic telescopic rod is slidably connected with a bottom end of the sliding block, characterized in that an outer wall of the sliding block is rotatably connected with a rotating rod, an outer wall of the rotating rod is fixedly connected with an active transmission roller, an outer wall of the active transmission roller is fixedly connected with a connecting rod, an outer wall of the connecting rod is movably connected with two symmetrical arc friction plates, the outer walls of the arc friction plates are all fixedly connected with elastic telescopic rods, and the ends of the elastic telescopic rods are jointly fixedly connected with a driving gear, a moving through hole is provided on the outer wall of the mounting frame, a tooth plate is fixedly connected with the inner wall of the moving through hole, and the tooth plate is meshed with the driving gear, and a height detector for the moving height of the driving gear is embedded in the side wall of the moving through hole.

[0007] Preferably, the top outer wall of the mounting frame is fixedly connected with a fixing plate, the end of the fixing plate is fixedly connected with a protective frame, the bottom end of the protective frame is fixedly connected with a supporting block, a sliding groove is provided at the bottom end of the supporting block and the inner wall of the protective frame, a sliding block is slidably connected to the inner wall of the sliding groove, a dual-axis motor is fixedly connected to the outer wall of the sliding block, the outer wall of the dual-axis motor is slidably connected to the inner wall of the protective frame, and the output end of the dual-axis motor is fixedly connected to a connecting rod.

[0008] Preferably, the other output end of the dual-axis motor is fixedly connected to a horizontal round rod, and the outer wall of the horizontal round rod is fixedly sleeved with a driving bevel gear, the outer wall of the dual-axis motor is fixedly connected to a support plate, the top of the support plate is rotatably connected to a vertical round rod, the top of the vertical round rod is fixedly connected to a driven bevel gear, and the driving bevel gear is meshed with the driven bevel gear, the top of the driven bevel gear is fixedly connected to a telescopic cylinder, the outer wall of the telescopic cylinder is rotatably connected to a connecting plate, and the outer wall of the connecting plate is fixedly connected to the inner wall of the protective frame, the end of the telescopic cylinder is fixedly connected to the main bevel gear, the top of the driven bevel gear is fixedly connected to a return spring, and the end of the return spring is fixedly connected to the main bevel gear.

[0009] Preferably, the inner wall of the installation frame is rotatably connected to a rotating rod, the outer wall of the rotating rod is fixedly sleeved with a driven conveying roller, the end of the rotating rod passes through the outer wall of the installation frame and is fixedly connected to a slave bevel gear, and the main bevel gear is meshed with the slave bevel gear.

[0010] Preferably, the outer wall of the mounting frame is fixedly connected with a circular block, the inner wall of the circular block is hinged with two matching clamps, and the inner walls of the clamps are commonly connected with a fixing spring, the ends of the two clamps are fixedly connected with an arc-shaped cleaning plate, and the inner walls of the arc-shaped cleaning plates are fixedly connected with a cleaning sponge.

[0011] Preferably, the top of the detector is fixedly connected to a fixed frame, the outer wall of the fixed frame is provided with a fixed opening, the inner wall of the fixed opening is hinged with a fixed door, and the inner wall of the fixed frame is rotatably connected to a rotating roller.

[0012] Preferably, the outer wall of the rotating rod and the outer wall of the connecting rod are rotatably connected to the support rod through a bearing, the outer walls of the support rod are commonly fixedly connected to a supporting cross plate, and the end of the supporting cross plate is fixedly connected to a second electromagnetic telescopic rod, and the bottom end of the second electromagnetic telescopic rod is fixedly connected to the upper surface of the detector, the top of the supporting cross plate is fixedly connected to an electric telescopic rod, the top of the electric telescopic rod is fixedly connected to an arc groove, the inner wall of the arc groove is fixedly connected to a smear cotton, the top of the fixed frame is fixedly connected to a dye box, the outer wall of the dye box is fixedly connected to two symmetrical liquid outlet pipes, and the ends of the liquid outlet pipes are fixedly connected to the inner wall of the arc groove.

[0013] Preferably, the active conveying roller, the driven conveying roller and the rotating roller are all made of metal and are electrically connected to the detector, the detector is electrically connected to the electric telescopic rod, the side wall of the detector is fixedly connected to a PLC controller, and the PLC controller is electrically connected to the height detector, the first electromagnetic telescopic rod, and the second electromagnetic telescopic rod.

[0014] The monitoring method of the power cable partial discharge monitoring device comprises the following steps: S1. First, hang the device on the cable line; S2, then start the dual-axis motor to squeeze the active conveying roller upward until the cable is squeezed and fixed; S3. After being squeezed and fixed, it can be automatically adjusted to the mobile mode, so that the detector can move on the surface of the cable; S4. The cable surface can be wiped clean while moving, and the partial discharge of the cable can be detected; S5. When partial discharge is detected in the cable, the location of the partial discharge can be automatically marked.

[0015] Compared with the existing technology, the advantages of the power cable partial discharge monitoring equipment and method are: By setting the active conveying roller, driven conveying roller, connecting rod, elastic telescopic rod, arc friction plate, active gear, tooth plate and double-axis motor, the distance between the active conveying roller and the driven conveying roller can be automatically adjusted according to the size of the cable, and the device can be placed on the surface of the cable line, thus ensuring the appropriate contact between the conveying roller and the cable, achieving effective conveying and detection effects.

[0016] By setting the elastic telescopic rod, arc friction plate, active gear, active bevel gear, driven bevel gear, telescopic cylinder, main bevel gear, reset spring, driven transmission roller and driven bevel gear, the device can be moved on the surface of the cable after being fixed, and partial discharge detection of the cable can be performed while moving. The cable surface can also be cleaned while detecting. The cable surface can be cleaned during the movement to remove existing dust, dirt or other impurities, which helps to reduce interference between the cable surface and the partial discharge detection device, improve the accuracy and reliability of detection, and can be automatically moved and detected without manual holding.

[0017] Through the support horizontal plate, electric telescopic rod, arc groove, cotton smear, dye box and liquid outlet pipe, the part with partial discharge can be automatically marked when the cable is detected. By automatically marking the partial discharge part, the operator can quickly locate the fault point without a lot of inspection and search. This saves time and human resources and enables faster repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of a partial three-dimensional structure from another angle in the present invention; Figure 4 It is a schematic diagram of a partial three-dimensional structure from another angle in the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the connecting rod in the present invention; Figure 6 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 7 It is another partial three-dimensional structural schematic diagram of the present invention; Figure 8 The present invention Figure 4 Schematic diagram of the three-dimensional structure of part A.

[0019] In the figure: 1 detector, 2 mounting frame, 3 mounting opening, 4 mounting door, 5 sliding groove, 6 sliding block, 7 first electromagnetic telescopic rod, 8 rotating rod, 9 active conveying roller, 10 liquid outlet pipe, 11 connecting rod, 12 elastic telescopic rod, 13 arc friction plate, 14 active gear, 15 moving through hole, 16 tooth plate, 17 fixed plate, 18 protection frame, 19 support block, 20 sliding groove, 21 slider, 22 dual-axis motor, 23 horizontal round rod, 24 active bevel gear, 25 support plate, 26 vertical round rod, 27 driven bevel gear, 28 telescopic cylinder, 29 main bevel gear, 30 return spring, 31 rotating rod, 32 driven transmission roller, 33 slave bevel gear, 34 circular block, 35 clamping plate, 36 fixed spring, 37 arc cleaning plate, 38 cleaning sponge, 39 fixed frame, 40 fixed door, 41 rotating roller, 42 supporting rod, 43 supporting cross plate, 44 electric telescopic rod, 45 arc groove, 46 smear cotton, 47 dye box, 48 second electromagnetic telescopic rod, 49 connecting plate. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] like Figure 1-Figure 8As shown, the power cable partial discharge monitoring device includes a detector 1, the top of the detector 1 is fixedly connected to a mounting frame 2, the outer wall of the mounting frame 2 is provided with a mounting opening 3, the inner wall of the mounting opening 3 is hinged with a mounting door 4, the outer wall of the mounting door 4 and the outer wall of the mounting frame 2 are jointly provided with a sliding groove 5, the inner wall of the sliding groove 5 is slidably connected to a sliding block 6, the bottom end of the sliding block 6 is fixedly connected to a first electromagnetic telescopic rod 7, the top of the first electromagnetic telescopic rod 7 is slidably connected to the bottom end of the sliding block 6, and is characterized in that the outer wall of the sliding block 6 is rotatably connected to a rotating rod 8, the outer wall of the rotating rod 8 is fixedly connected to an active transmission roller 9, and the outer wall of the active transmission roller 9 is fixedly connected to a connecting rod 8. The connecting rod 11 has two symmetrical arc-shaped friction plates 13 movably connected to the outer wall of the connecting rod 11. The outer walls of the arc-shaped friction plates 13 are fixedly connected with elastic telescopic rods 12. The ends of the elastic telescopic rods 12 are commonly fixedly connected with driving gears 14. The outer wall of the mounting frame 2 is provided with a movable through hole 15. The inner wall of the movable through hole 15 is fixedly connected with a toothed plate 16, and the toothed plate 16 is meshed with the driving gear 14. The side wall of the movable through hole 15 is embedded with a height detector for the moving height of the driving gear 14. The elastic telescopic rod 12 is a kind of elastic force that uses a spring to achieve a telescopic function. The elastic telescopic rod 12 has elasticity and elasticity, but will not tilt.

[0022] The top outer wall of the mounting frame 2 is fixedly connected with a fixing plate 17, the end of the fixing plate 17 is fixedly connected with a protective frame 18, the bottom end of the protective frame 18 is fixedly connected with a supporting block 19, a sliding groove 20 is provided between the bottom end of the supporting block 19 and the inner wall of the protective frame 18, a sliding block 21 is slidably connected to the inner wall of the sliding groove 20, a dual-axis motor 22 is fixedly connected to the outer wall of the sliding block 21, the outer wall of the dual-axis motor 22 is slidably connected to the inner wall of the protective frame 18, and the output end of the dual-axis motor 22 is fixedly connected to the connecting rod 11.

[0023] The other output end of the dual-axis motor 22 is fixedly connected to a horizontal round rod 23, and the outer wall of the horizontal round rod 23 is fixedly sleeved with a driving bevel gear 24. The outer wall of the dual-axis motor 22 is fixedly connected to a support plate 25, and the top of the support plate 25 is rotatably connected to a vertical round rod 26, and the top of the vertical round rod 26 is fixedly connected to a driven bevel gear 27, and the driving bevel gear 24 is meshed with the driven bevel gear 27, and the top of the driven bevel gear 27 is fixedly connected to a telescopic cylinder 28, and the outer wall of the telescopic cylinder 28 is rotatably connected to a connecting plate 49, and the outer wall of the connecting plate 49 is fixedly connected to the inner wall of the protective frame 18, and the end of the telescopic cylinder 28 is fixedly connected to the main bevel gear 29, and the top of the driven bevel gear 27 is fixedly connected to a reset spring 30, and the end of the reset spring 30 is fixedly connected to the main bevel gear 29.

[0024] The inner wall of the mounting frame 2 is rotatably connected with a rotating rod 31, and the outer wall of the rotating rod 31 is fixedly sleeved with a driven transmission roller 32. The end of the rotating rod 31 passes through the outer wall of the mounting frame 2 and is fixedly connected with a slave bevel gear 33, and the main bevel gear 29 is meshed with the slave bevel gear 33. The telescopic cylinder 28 is a telescopic structure with a telescopic function and a through hole in the center. It is usually composed of an inner cylinder and an outer cylinder, and the telescopic cylinder 28 has a rotation limiting structure. Therefore, the inner cylinder and the outer cylinder of the telescopic cylinder 28 can only move up and down but not rotate. Since the bottom end of the telescopic cylinder 28 is connected with the driven bevel gear 27, and the bottom end of the driven bevel gear 27 is connected with a vertical round rod 26, the bottom end of the vertical round rod 26 is connected to the support plate 25 connected to the dual-axis motor 22, so that the telescopic end of the telescopic cylinder 28 can drive the driven bevel gear 27 to follow the upward movement of the dual-axis motor 22, so that the driven bevel gear 27 can be kept meshed with the active bevel gear 24.

[0025] The outer wall of the mounting frame 2 is fixedly connected with a circular block 34, the inner wall of the circular block 34 is hinged with two matching clamps 35, and the inner walls of the clamps 35 are commonly connected with a fixing spring 36, the ends of the two clamps 35 are fixedly connected with an arc cleaning plate 37, and the inner walls of the arc cleaning plates 37 are fixedly connected with a cleaning sponge 38.

[0026] A fixing frame 39 is fixedly connected to the top of the detector 1 . A fixing opening is formed on the outer wall of the fixing frame 39 . A fixing door 40 is hingedly connected to the inner wall of the fixing opening. A rotating roller 41 is rotatably connected to the inner wall of the fixing frame 39 .

[0027] The outer wall of the rotating rod 8 and the outer wall of the connecting rod 11 are rotatably connected to the support rod 42 through bearings, the outer walls of the support rod 42 are commonly fixedly connected to the supporting cross plate 43, and the end of the supporting cross plate 43 is fixedly connected to the second electromagnetic telescopic rod 48, and the bottom end of the second electromagnetic telescopic rod 48 is fixedly connected to the upper surface of the detector 1, the top of the supporting cross plate 43 is fixedly connected to the electric telescopic rod 44, the top of the electric telescopic rod 44 is fixedly connected to the arc groove 45, the inner wall of the arc groove 45 is fixedly connected to the smear cotton 46, the top of the fixed frame 39 is fixedly connected to the dye box 47, the outer wall of the dye box 47 is fixedly connected to two symmetrical liquid outlet pipes 10, and the end of the liquid outlet pipe 10 is fixedly connected to the inner wall of the arc groove 45.

[0028] The active conveying roller 9, the driven conveying roller 32 and the rotating roller 41 are all made of metal and are electrically connected to the detector 1. The detector 1 is electrically connected to the electric telescopic rod 44. The side wall of the detector 1 is fixedly connected with a PLC controller. The PLC controller is electrically connected to the height detector, the first electromagnetic telescopic rod 7, and the second electromagnetic telescopic rod 48. The first electromagnetic telescopic rod 7 and the second electromagnetic telescopic rod 48 are both a structure that uses the principle of electromagnetic force to control telescopic movement. It is usually composed of components such as an electromagnet, a guide device and a telescopic rod. By controlling the power-on state of the electromagnet, the length of the electromagnetic telescopic rod can be adjusted to achieve the telescopic function.

[0029] The monitoring method of the power cable partial discharge monitoring device comprises the following steps: S1. First, hang the device on the cable line; S2, then start the dual-axis motor 22 to squeeze the active conveying roller 9 upward until the cable is squeezed and fixed; S3, after being squeezed and fixed, it can be automatically adjusted to the moving mode, so that the detector 1 moves on the surface of the cable; S4. The cable surface can be wiped clean while moving, and the partial discharge of the cable can be detected; S5. When partial discharge is detected in the cable, the location of the partial discharge can be automatically marked.

[0030] The operating principle of the present invention is now described as follows: First, open the installation door 4 and the fixed door 40, place the driven conveying roller 32 and the rotating roller 41 in the device on the upper end of the cable, then close the installation door 4 and the fixed door 40, pinch the clamping plate 35 at the same time, and then use the clamping plate 35 to drive the two arc-shaped cleaning plates 37 to separate to both sides, then place the cable between the two arc-shaped cleaning plates 37, and then release the clamping plate 35. Through the fixing spring 36 between the clamping plates 35, the two arc-shaped cleaning plates 37 can clamp the cable, and then the cleaning sponge 38 in the arc-shaped cleaning plate 37 can contact the surface of the cable.

[0031] Then, the dual-axis motor 22 is started, and the rotation of the dual-axis motor 22 will drive the connecting rod 11 to rotate, and then the rotation of the connecting rod 11 will drive the driving gear 14 to rotate. Since the tooth plate 16 is meshed with the driving gear 14, the driving gear 14 will move upward on the surface of the tooth plate 16 due to the rotation of the driving gear 14. The upward movement of the driving gear 14 can drive the active transmission roller 9 to move upward while rotating through the connecting rod 11, and the active transmission roller 9 will drive the rotating rod 8 to move synchronously, and the rotating rod 8 will drive the sliding block 6 to move synchronously until the active transmission roller 9 is in close contact with the bottom end of the cable. At the same time, the movement of the rotating rod 8 further drives the two support rods 42 and the supporting cross plate 43 to move upward synchronously, and the current passed into the second electromagnetic telescopic rod 48 is controlled by the PLC controller (the current size is the pre-tested current required to move the driving gear 14 to a certain height so that the extension length of the second electromagnetic telescopic rod 48 is consistent with the moving distance of the support rod 42 and the supporting cross plate 43, so as to support the support rod 42 and the supporting cross plate 43).

[0032] Then, when the active transmission roller 9 is in close contact with the bottom end of the cable, the strong rotational force of the dual-axis motor 22 will drive the connecting rod 11 to rotate, and then overcome the friction between the elastic telescopic rod 12 and the arc-shaped friction plate 13, so that the connecting rod 11 will rotate by itself and no longer drive the active gear 14 to rotate. At the same time, the moving height of the active gear 14 is detected by the height detector, and the data is transmitted to the PLC controller, and then the current passed into the first electromagnetic telescopic rod 7 is controlled by the PLC controller (the current is the current required to keep the active transmission roller 9 from tilting so that the active transmission roller 9 and the active gear are on the same horizontal plane when the active transmission roller 9 moves to a certain height in advance). Therefore, the active gear 14 will not tilt or get stuck, and the device will not over-extrude the cable after squeezing it, and the connecting rod 11 will be driven to rotate by the rotation of the dual-axis motor 22. The active transmission roller 9 is driven to rotate through the rotation of the connecting rod 11, and then the horizontal round rod 23 is driven through the rotation of the other output end of the dual-axis motor 22, and then the active bevel gear 24 is driven to rotate through the rotation of the horizontal round rod 23, and then the driven bevel gear 27 is driven to rotate through the rotation of the active bevel gear 24, and then the telescopic cylinder 28 is driven to rotate through the rotation of the driven bevel gear 27, and then the main bevel gear 29 is driven to rotate through the rotation of the telescopic cylinder 28, and then the slave bevel gear 33 is driven by the rotation of the main bevel gear 29, and then the rotating rod 31 is driven to rotate through the slave bevel gear 33, and then the driven transmission roller 32 is driven to rotate through the rotating rod 31, and then the active transmission roller 9 and the driven transmission roller 32 are driven to move the device on the surface of the cable through the cooperation, and then the telescopic cylinder 28 and the return spring 30 are used to facilitate the distance adjustment between the active transmission roller 9 and the driven transmission roller 32.

[0033] Since the active transmission roller 9, the driven transmission roller 32 and the rotating roller 41 are all made of metal and are electrically connected to the detector 1, the device will perform local discharge detection on the cable while moving on the surface of the cable. When local discharge is detected in the cable, since the detector 1 is electrically connected to the electric telescopic rod 44, the electric telescopic rod 44 will be controlled to drive the arc groove 45 to move upward, and then the dye in the dye box 47 will be transferred to the surface of the smear cotton 46 through the liquid outlet pipe 10, so that the smear cotton 46 is in contact with the cable to achieve the effect of marking the cable surface, which can facilitate the accurate location of the local discharge during maintenance.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power cable partial discharge monitoring device, comprising a detector (1), wherein the top of the detector (1) is fixedly connected to a mounting frame (2), the outer wall of the mounting frame (2) is provided with a mounting opening (3), the inner wall of the mounting opening (3) is hingedly provided with a mounting door (4), the outer wall of the mounting door (4) and the outer wall of the mounting frame (2) are jointly provided with a sliding groove (5), the inner wall of the sliding groove (5) is slidably connected to a sliding block (6), the bottom end of the sliding block (6) is fixedly connected to a first electromagnetic telescopic rod (7), the top end of the first electromagnetic telescopic rod (7) is slidably connected to the bottom end of the sliding block (6), and the characteristic is that: The outer wall of the sliding block (6) is rotatably connected to a rotating rod (8), the outer wall of the rotating rod (8) is fixedly connected to an active transmission roller (9), the outer wall of the active transmission roller (9) is fixedly connected to a connecting rod (11), the outer wall of the connecting rod (11) is movably connected to two symmetrical arc-shaped friction plates (13), the outer walls of the arc-shaped friction plates (13) are fixedly connected to elastic telescopic rods (12), the ends of the elastic telescopic rods (12) are commonly fixedly connected to an active gear (14), the outer wall of the mounting frame (2) is provided with a moving through hole (15), the inner wall of the moving through hole (15) is fixedly connected to a toothed plate (16), and the toothed plate (16) is meshed with the active gear (14), and the side wall of the moving through hole (15) is embedded with a height detector for monitoring the moving height of the active gear (14).

2. The power cable partial discharge monitoring device according to claim 1, characterized in that: The top outer wall of the installation frame (2) is fixedly connected to a fixing plate (17), the end of the fixing plate (17) is fixedly connected to a protection frame (18), the bottom end of the protection frame (18) is fixedly connected to a support block (19), the bottom end of the support block (19) and the inner wall of the protection frame (18) are provided with a slide groove (20), the inner wall of the slide groove (20) is slidably connected to a slider (21), the outer wall of the slider (21) is fixedly connected to a dual-axis motor (22), the outer wall of the dual-axis motor (22) is slidably connected to the inner wall of the protection frame (18), and the output end of the dual-axis motor (22) is fixedly connected to the connecting rod (11).

3. The power cable partial discharge monitoring device according to claim 2, characterized in that: The other output end of the dual-axis motor (22) is fixedly connected to a horizontal round rod (23), the outer wall of the horizontal round rod (23) is fixedly sleeved with a driving bevel gear (24), the outer wall of the dual-axis motor (22) is fixedly connected to a support plate (25), the top end of the support plate (25) is rotatably connected to a vertical round rod (26), the top end of the vertical round rod (26) is fixedly connected to a driven bevel gear (27), and the driving bevel gear (24) is meshed with the driven bevel gear (27), the top end of the driven bevel gear (27) is fixedly connected to a telescopic cylinder (28), the outer wall of the telescopic cylinder (28) is rotatably connected to a connecting plate (49), and the outer wall of the connecting plate (49) is fixedly connected to the inner wall of the protective frame (18), the end of the telescopic cylinder (28) is fixedly connected to the main bevel gear (29), the top end of the driven bevel gear (27) is fixedly connected to a return spring (30), and the end of the return spring (30) is fixedly connected to the main bevel gear (29).

4. The power cable partial discharge monitoring device according to claim 1, characterized in that: The inner wall of the installation frame (2) is rotatably connected to a rotating rod (31), the outer wall of the rotating rod (31) is fixedly sleeved with a driven transmission roller (32), the end of the rotating rod (31) passes through the outer wall of the installation frame (2) and is fixedly connected to a slave bevel gear (33), and the main bevel gear (29) is meshed with the slave bevel gear (33).

5. The power cable partial discharge monitoring device according to claim 1, characterized in that: The outer wall of the mounting frame (2) is fixedly connected to a circular block (34), the inner wall of the circular block (34) is hinged with two matching clamping plates (35), and the inner walls of the clamping plates (35) are commonly connected to a fixing spring (36), the ends of the two clamping plates (35) are fixedly connected to an arc-shaped cleaning plate (37), and the inner walls of the arc-shaped cleaning plates (37) are fixedly connected to a cleaning sponge (38).

6. The power cable partial discharge monitoring device according to claim 1, characterized in that: The top end of the detector (1) is fixedly connected to a fixing frame (39), an outer wall of the fixing frame (39) is provided with a fixing opening, an inner wall of the fixing opening is hingedly connected to a fixing door (40), and the inner wall of the fixing frame (39) is rotatably connected to a rotating roller (41).

7. The power cable partial discharge monitoring device according to claim 6, characterized in that: The outer wall of the rotating rod (8) and the outer wall of the connecting rod (11) are both rotatably connected to a support rod (42) via a bearing; the outer wall of the support rod (42) is commonly fixedly connected to a support cross plate (43); the end of the support cross plate (43) is fixedly connected to a second electromagnetic telescopic rod (48); the bottom end of the second electromagnetic telescopic rod (48) is fixedly connected to the upper surface of the detector (1); the top of the support cross plate (43) is fixedly connected to an electric telescopic rod (44); the top of the electric telescopic rod (44) is fixedly connected to an arc-shaped groove (45); the inner wall of the arc-shaped groove (45) is fixedly connected to a smear cotton (46); the top of the fixed frame (39) is fixedly connected to a dye box (47); the outer wall of the dye box (47) is fixedly connected to two symmetrical liquid outlet pipes (10); the ends of the liquid outlet pipes (10) are fixedly connected to the inner wall of the arc-shaped groove (45).

8. The power cable partial discharge monitoring device according to claim 6, characterized in that: The active conveying roller (9), the driven conveying roller (32) and the rotating roller (41) are all made of metal and are electrically connected to the detector (1). The detector (1) is electrically connected to the electric telescopic rod (44). A PLC controller is fixedly connected to the side wall of the detector (1). The PLC controller is electrically connected to the height detector, the first electromagnetic telescopic rod and the second electromagnetic telescopic rod.

9. A monitoring method based on a power cable partial discharge monitoring device, applied to the power cable partial discharge monitoring device according to claim 2, characterized in that: The following steps are involved: S1. First, hang the device on the cable line; S2, then starting the dual-axis motor (22) to squeeze the active conveying roller (9) upward until the cable is squeezed and fixed; S3. After being squeezed and fixed, it can be automatically adjusted to the moving mode, so that the detector (1) moves on the surface of the cable; S4. The cable surface can be wiped clean while moving, and the partial discharge of the cable can be detected; S5. When partial discharge is detected in the cable, the location of the partial discharge can be automatically marked.

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