High-precision long-time accidental partial discharge diagnosis positioning device

Abstract

The invention discloses a high-precision long-time accidental partial discharge diagnosis and positioning device, and relates to the technical field of high-altitude cable detection devices, the high-precision long-time accidental partial discharge diagnosis and positioning device comprises a shell capable of moving on a cable, and further comprises an ultrasonic detector mounted on the shell; and the vibration mechanism comprises a buffer assembly, the input end of the buffer assembly is located on the outer side of the shell, and the output end of the buffer assembly is located on the inner side of the shell and communicates with a piston barrel. The vibration mechanism is arranged, external wind power is converted into pushing force for pushing hydraulic oil through the buffer assembly, finally, a knocking block forms knocking vibration on the cable, a vibration damper plate makes contact with the surface of the cable in the knocking process, and the vibration frequency of the cable when the cable is vibrated by the knocking block is changed; therefore, the vibration frequency of the ice blocks attached to the surface of the cable is changed through the change of the vibration frequency, the ice blocks are further broken and fall off, and the removal effect of the ice blocks on the cable is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aerial cable detection devices, and in particular to a high-precision long-term occasional partial discharge diagnosis and positioning device. Background Art

[0002] Cables are indispensable for controlling installation, connecting equipment, and transmitting electricity. Compared with ordinary cables, aerial cables require stronger stability and are erected at high altitudes. During the use of aerial cables, when there is a problem with the cable, a detection device is required to detect the cable. The aerial cables in plateau areas are subject to greater wind force at high altitudes, and the wind force will cause the detection device to shake, affecting the detection effect.

[0003] In the prior art, a buffer mechanism is used to buffer wind force. When the wind drives the device to move, an induced current is generated, and the magnetic field generated by the induced current will weaken the moving speed of the buffer mechanism. The kinetic energy of the device caused by the wind will be removed by the magnetic force and the buffer force. In this method, there is a lack of de-icing operations for high-altitude cables that will freeze in plateau areas in winter, and the rapid multi-frequency de-icing operations for frozen cables cannot be automatically completed. The cable surface is easily frozen, which affects the detection effect, thereby reducing the high-precision long-term occasional partial discharge diagnosis and positioning capabilities of high-altitude cables. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art of lack of de-icing operation for high-altitude cables that will freeze in plateau areas in winter, inability to automatically complete rapid multi-frequency de-icing operation for frozen cables, and easy ice formation on the cable surface affecting the detection effect, and to propose a high-precision long-term occasional partial discharge diagnostic positioning device.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a high-precision long-term occasional partial discharge diagnosis and positioning device, comprising a housing movable on a cable, and also comprising: An ultrasonic detector, wherein the ultrasonic detector is mounted on the housing; A vibration mechanism, the vibration mechanism includes a buffer assembly, the input end of the buffer assembly is located on the outside of the shell, and the output end is located on the inside of the shell and is connected to a piston cylinder, the piston cylinder is fixedly connected to the shell, and one end is penetrated by a piston column in a sealing sliding connection, the piston cylinder is connected to a knocking assembly, the friction between the piston column and the piston cylinder is greater than the friction of the internal structure of the knocking assembly, one end of the piston column extending out of the piston cylinder is fixedly connected to a shock-absorbing plate, and the output end of the knocking assembly and the shock-absorbing plate are both matched with the cable interval.

[0006] In the above-mentioned high-precision long-duration occasional partial discharge diagnostic positioning device, a moving mechanism is connected inside the shell, and the moving mechanism includes a controller, the controller is installed on the top of the shell, the top of the shell is rotatably connected to a support roller, and the bottom of the shell is rotatably connected to a drive roller, the output end of the controller is coaxially fixedly connected to one end of the drive roller, and is used to control the drive roller to rotate, and the opposite sides of the support roller and the drive roller are pressed against the cable.

[0007] In the above-mentioned high-precision long-duration occasional partial discharge diagnosis and positioning device, the ultrasonic detectors include two, and the two ultrasonic detectors are installed on both sides of the housing in a one-to-one correspondence. The ultrasonic detectors are used to detect and locate the cable.

[0008] In the above-mentioned high-precision long-term occasional partial discharge diagnostic positioning device, the buffer component includes two, the buffer component includes buffer plates, the two buffer plates are distributed one-to-one on the two outer sides of the shell, and the opposite sides are fixedly connected to the hydraulic plate through buffer columns, the two outer side walls of the shell are fixedly connected to buffer cylinders, the two hydraulic plates are sealed and slidably connected in the two buffer cylinders one-to-one, the buffer cylinder is connected to a fixed pipe on the side away from the hydraulic plate, and the fixed pipe is connected to the piston cylinder at one end away from the buffer cylinder; the knocking component includes a connecting pipe, the top of the piston cylinder is connected to the middle of the connecting pipe through a branch pipe, and both ends of the connecting pipe are connected to fixed cylinders, the fixed cylinder is fixedly connected to the inner wall of the shell, and is sealed and slidably connected to an extrusion plate inside, a spring is fixedly connected between the extrusion plate and the inner wall of the fixed cylinder, and the extrusion plate is fixedly connected to a knocking block at one end away from the connecting pipe through a connecting column that seals and penetrates the fixed cylinder, and four knocking blocks extend out of one end of the fixed cylinder and are spaced and matched with the outside of the cable.

[0009] In the above-mentioned high-precision long-duration occasional partial discharge diagnosis and positioning device, the interconnected parts of the buffer cylinder, the piston cylinder and the fixed cylinder are all filled with hydraulic oil.

[0010] In the above-mentioned high-precision long-duration occasional partial discharge diagnosis and positioning device, the two buffer cylinders are connected to each other at one side away from the buffer plate by a same connecting pipe, and the shell is provided with slots for the branch pipe and the connecting pipe to pass through.

[0011] In the above-mentioned high-precision long-duration occasional partial discharge diagnostic positioning device, the four knocking blocks are distributed in a circular array at intervals on the outer periphery of the cable, wherein the branch pipe, connecting pipe and fixing tube are all distributed symmetrically with respect to the cable axis.

[0012] In the above-mentioned high-precision long-term occasional partial discharge diagnostic positioning device, it also includes a windshield mechanism, the windshield mechanism includes a mounting block, two mounting blocks are fixedly connected to the top and bottom of the outer shell in a one-to-one manner, an inner cavity is opened in the mounting block, both ends of the inner cavity are sealed and slidably connected with movable plates, the end of the movable plate away from the inner cavity is fixedly connected with a windshield block, the end of the windshield block away from the movable plate is sealed and penetrates the mounting block, and is fixedly connected with the windshield plate, the two inner cavities are connected to airbags on opposite sides, and the airbags are located between the mounting block and the cable.

[0013] In the above-mentioned high-precision long-duration occasional partial discharge diagnosis and positioning device, the airbags include a plurality of airbags, and the plurality of airbags are evenly spaced and distributed on the mounting block.

[0014] In the above-mentioned high-precision long-duration occasional partial discharge diagnosis and positioning device, a plurality of recoverable dampers are installed between the wind shield and the mounting block.

[0015] Compared with the prior art, the advantages of the present invention are: 1. The present invention provides a vibration mechanism, and converts external wind force into a driving force for pushing the hydraulic oil through a buffer component. Since the friction between the outer wall of the piston column and the inner wall of the piston cylinder is relatively large, the hydraulic oil entering the piston cylinder will enter the two fixed cylinders through the branch pipe and the connecting pipe, thereby overcoming the elastic force of the spring to push the knocking block to move, so that the knocking block forms a knocking vibration on the cable. When the knocking block contacts the surface of the cable, part of the hydraulic oil inside the fixed cylinder flows back into the piston cylinder, and the piston column inside the piston cylinder is squeezed again until the piston column gradually drives the shock absorbing plate to contact the surface of the cable, which can change the vibration frequency of the cable when it is vibrated by the knocking block, and then the vibration frequency of the ice attached to the surface of the cable is changed through the change of the vibration frequency, and the ice is further broken and falls off, thereby improving the effect of removing ice from the cable.

[0016] 2. The present invention connects two buffer cylinders by setting a connecting pipe, so that when one of the two groups of buffer plates is affected by wind, the hydraulic oil in one group of buffer cylinders will be transported to the other group of buffer cylinders through the connecting pipe, and finally the four groups of knocking blocks will knock on the cable, thereby causing the ice on the cable surface to break and fall, avoiding large areas of ice adhering to the cable surface and affecting the detection results.

[0017] 3. The present invention provides a wind shield mechanism. When the wind speed passing through the shell is high, the wind shield is impacted by the wind, and the space of the inner cavity of the mounting block is squeezed by the movable plate, so that the air in the inner cavity enters the airbag. The airbag expands after being inflated, thereby reducing the flow diameter in the shell, reducing the passage of wind, and reducing the flow rate of wind through the inside of the shell, effectively avoiding the temperature drop of the residual condensed beads after the cable is broken due to the excessive flow rate of the wind, thereby effectively reducing the possibility of secondary freezing of the generated condensed beads. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Figure 2 A schematic diagram of the side-section axonometric structure of a housing of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Figure 3 This is a schematic structural diagram of a buffer plate and a buffer cylinder portion of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Figure 4 This is a schematic diagram of the structure of the buffer cylinder and piston cylinder of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Figure 5 A schematic diagram of a half-section axonometric structure of a buffer plate and a buffer tube of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Figure 6 A schematic diagram of a half-section axonometric structure of a fixed block and a piston cylinder of a high-precision long-duration sporadic partial discharge diagnostic positioning device proposed by the present invention; Figure 7 A schematic diagram of the structure of the extrusion plate and the knocking block part of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Figure 8 A schematic diagram of a quarter-side cross-sectional structure of a housing of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Fig. 9 This is a schematic diagram of the structure of the airbag and mounting block part of a high-precision long-duration occasional partial discharge diagnosis and positioning device proposed by the present invention; Fig.10 This is a schematic diagram of the semi-section axonometric structure of the mounting block and movable plate of a high-precision long-duration occasional partial discharge diagnostic positioning device proposed by the present invention.

[0019] In the figure: 1 housing, 11 controller, 12 support roller, 13 driving roller, 14 ultrasonic detector, 2 buffer cylinder, 21 buffer plate, 22 hydraulic plate, 23 fixed pipe, 24 connecting pipe, 3 piston cylinder, 31 piston column, 32 shock absorbing plate, 33 connecting pipe, 4 fixed cylinder, 41 extrusion plate, 42 knocking block, 43 spring, 5 mounting block, 51 windshield, 52 movable plate, 53 damper, 54 airbag. DETAILED DESCRIPTION

[0020] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0021] Reference Figure 1 and Figure 2 A high-precision long-term occasional partial discharge diagnosis and positioning device comprises a housing 1, and further comprises: A moving mechanism is connected inside the shell 1, and the moving mechanism includes a controller 11. The controller 11 is installed on the top of the shell 1. A support roller 12 is rotatably connected to the top of the shell 1, and a driving roller 13 is rotatably connected to the bottom of the shell 1. The output end of the controller 11 is coaxially fixedly connected to one end of the driving roller 13, and is used to control the driving roller 13 to rotate. The opposite sides of the support roller 12 and the driving roller 13 are pressed against the cable.

[0022] The ultrasonic detector 14 is installed on the inner wall of the shell 1 .

[0023] The two ultrasonic detectors 14 are installed on two sides of the housing 1 in a one-to-one correspondence. The ultrasonic detectors 14 are used to detect and locate the cables.

[0024] Reference Figure 3-Figure 7 , vibration mechanism, the vibration mechanism includes two buffer components, the two buffer components are connected to both sides of the shell 1 one by one, the input end of the buffer component is located on the outside of the shell 1, and the input end is located on the inside of the shell 1 and is connected to the piston cylinder 3.

[0025] The buffer assembly includes a buffer plate 21, and the two buffer plates 21 are fixedly connected to the hydraulic plate 22 on the opposite side through the buffer column. The two outer side walls of the outer shell 1 are fixedly connected to the buffer cylinder 2. The two hydraulic plates 22 are sealed and slidably connected in the two buffer cylinders 2 in a one-to-one manner. The side of the buffer cylinder 2 away from the hydraulic plate 22 is connected to a fixed pipe 23, and the end of the fixed pipe 23 away from the buffer cylinder 2 is connected to the piston cylinder 3.

[0026] The piston cylinder 3 is fixedly connected to the outer shell 1, and one end thereof is penetrated and slidably connected with a piston column 31, the top of the piston cylinder 3 is connected with a connecting tube 33 through a branch pipe, both ends of the connecting tube 33 are connected with a fixed cylinder 4, the fixed cylinder 4 is fixedly connected to the inner wall of the outer shell 1, and is sealed and slidably connected with an extrusion plate 41 inside, a spring 43 is fixedly connected between the extrusion plate 41 and the inner wall of the fixed cylinder 4, the extrusion plate 41 is fixedly connected with a knocking block 42 at one end away from the connecting tube 33 through a connecting column that seals and penetrates the fixed cylinder 4, wherein the branch pipe, the connecting tube 33 and the fixed cylinder 4 are all centrally symmetrically distributed with respect to the axial direction of the cable, four knocking blocks 42 extend out of one end of the fixed cylinder 4 and are spaced apart from the outside of the cable, the friction between the piston column 31 and the piston cylinder 3 is greater than the friction between the extrusion plate 41 and the fixed cylinder 4, the piston column 31 extends out of the piston cylinder 3 and is fixedly connected with a damping plate 32 at one end thereof, and the damping plate 32 is spaced apart from the surface of the cable.

[0027] The interconnected parts of the buffer cylinder 2, the piston cylinder 3 and the fixed cylinder 4 are all filled with hydraulic oil to improve the transmission effect.

[0028] The two buffer cylinders 2 are connected to each other at the sides away from the buffer plate 21 by a common connecting pipe 24 , and the housing 1 is provided with slots for the branch pipes and the connecting pipe 24 to pass through.

[0029] The four knocking blocks 42 are distributed in a circular array at intervals on the outer peripheral side of the cable, wherein the branch pipe, the connecting pipe 33 and the fixing tube 4 are all distributed symmetrically with respect to the cable axis, thereby improving the distribution effect of the knocking blocks 42 .

[0030] Reference Figure 8-Figure 10 , and also includes a windshield mechanism, which includes a mounting block 5, two mounting blocks 5 are fixedly connected to the top and bottom of the shell 1 in a one-to-one correspondence, an inner cavity is opened in the mounting block 5, and both ends of the inner cavity are sealed and slidably connected with movable plates 52, and the movable plate 52 is fixedly connected with a windshield block at one end away from the inner cavity, and the windshield block is sealed and penetrated through the mounting block 5 at one end away from the movable plate 52, and is fixedly connected with a windshield plate 51, and the opposite sides of the two inner cavities are connected with airbags 54, and the airbags 54 are located between the mounting block 5 and the cable.

[0031] The airbags 54 include a plurality of airbags 54 , which are evenly spaced and distributed on the mounting block 5 .

[0032] A plurality of recoverable dampers 53 are installed between the wind shield 51 and the mounting block 5. The dampers 53 adopt the existing technology and are used to slow down the movement of the wind shield 51 and restore the wind shield 51 to its original position after the external force is lost.

[0033] In the present invention, the support roller 12 and the driving roller 13 are respectively placed at the upper and lower ends of the cable, and then the controller 11 is turned on, so that the controller 11 controls the driving roller 13 to rotate, so that the housing 1 moves along the surface of the cable, and the movement of the housing 1 drives the two sets of ultrasonic detectors 14 to detect the cable; Since cables in plateau areas are often installed at a higher height, the wind force at a higher place will be greater. When the wind exerts force on the device, it will first generate thrust on the buffer plate 21, so that the buffer plate 21 drives the buffer column to slide along the inner wall of the buffer cylinder 2. The sliding of the buffer plate 21 will drive the hydraulic plate 22 to slide along the inner wall of the buffer cylinder 2. Since hydraulic oil is provided inside the buffer cylinder 2, the buffer plate 21 will be hindered by the hydraulic oil inside the buffer cylinder 2 and the friction between the components when moving, so as to reduce shock, thereby reducing the vibration generated by the housing 1 and avoiding affecting the detection result of partial discharge. When the buffer plate 21 drives the hydraulic plate 22 to squeeze the hydraulic oil inside the buffer cylinder 2, the internal pressure of the buffer cylinder 2 increases, and then the hydraulic oil inside the buffer cylinder 2 enters the interior of the piston cylinder 3 through the fixed pipe 23; At this time, the internal pressure of the piston cylinder 3 increases, which causes the hydraulic oil in the piston cylinder 3 to generate thrust on the piston rod 31, causing the piston rod 31 to slide from the outside to the inside along the inside of the piston cylinder 3. At this time, due to the large friction between the outer wall of the piston rod 31 and the inner wall of the piston cylinder 3, the piston rod 31 slides slowly. At this time, the internal pressure of the piston cylinder 3 is large, causing the hydraulic oil in the piston cylinder 3 to enter the connecting pipe 33. Then the hydraulic oil enters the two groups of fixed cylinders 4 through the connecting pipe 33. The hydraulic oil entering the fixed cylinder 4 will increase its internal pressure. At this time, the hydraulic oil inside the fixed cylinder 4 will generate thrust on the extrusion plate 41, so that the extrusion plate 41 slides from the outside to the inside along the inner wall of the fixed cylinder 4. The sliding of the extrusion plate 41 will squeeze the spring 43 and drive the knocking block 42 to move synchronously until the knocking block 42 contacts the surface of the cable. At this time, the knocking block 42 will cause the cable to vibrate. Since the two groups of buffer cylinders 2 are connected by the connecting pipe 24, when one of the two groups of buffer plates 21 is affected by wind force, the hydraulic oil in one group of buffer cylinders 2 will be transported to the other group of buffer cylinders 2 through the connecting pipe 24, so that the hydraulic oil in the two groups of buffer cylinders 2 will be squeezed, thereby driving the knocking blocks 42 inside the four groups of fixed cylinders 4 to move synchronously, so that the four groups of knocking blocks 42 knock on the cable, and then the ice on the cable surface breaks and falls, avoiding large areas of ice adhering to the cable surface and affecting the detection results; When the knocking block 42 contacts the cable surface, the hydraulic oil pressure inside the fixed cylinder 4 cannot maintain balance, so that part of the hydraulic oil inside the fixed cylinder 4 flows back into the piston cylinder 3, and squeezes the piston column 31 inside the piston cylinder 3 again, until the piston column 31 gradually overcomes the greater friction between it and the piston cylinder 3 and drives the shock-absorbing plate 32 to contact the surface of the cable. Before the shock-absorbing plate 32 contacts the cable surface, the cable is in a vibrating state due to the impact of the knocking block 42. At this time, when the two groups of shock-absorbing plates 32 contact the cable surface, they can change the vibration frequency of the cable, so that the cable changes the vibration frequency of the ice attached to the surface through the change of the vibration frequency, and further causes the ice to break and fall. At the same time, the two groups of shock-absorbing plates 32 can also help the cable reduce the amplitude of vibration when it vibrates, so that the cable can quickly maintain stability when it is vibrated, avoiding the influence of excessive vibration on the detection result of partial discharge.

[0034] When the ice on the cable surface breaks and falls, condensation beads will remain on the surface. At this time, the condensation beads on the cable surface can be blown away by the wind. When the wind is strong, the flow rate generated by the wind is too fast, which will cause the temperature of the condensation beads to drop, and then the condensation beads may freeze again. At this time, when the wind passes through the interior of the shell 1, it will generate thrust on the windshield plate 51, and the greater the wind force, the greater the thrust on the windshield plate 51. The thrust on the windshield plate 51 will drive the windshield block to slide along the inner wall of the mounting block 5. The sliding of the windshield plate 51 will drive the movable plate 52 to move synchronously. The sliding of the movable plate 52 will squeeze the gas inside the mounting block 5, thereby increasing the pressure of the gas inside the mounting block 5. At this time, the gas inside the mounting block 5 will enter the airbag 54, and the internal pressure of the airbag 54 will increase and expand. When the airbag 54 expands, it will reduce the opening inside the shell 1 through which the wind can pass. At this time, only a small amount of wind can pass through the interior of the shell 1, thereby reducing the flow rate of the wind through the interior of the shell 1. At the same time, when the wind shield 51 moves, it will squeeze the damper 53, and the damper 53 will slowly reset the wind shield 51, so that the airbag 54 will slowly shrink after expanding, so that when encountering intermittent strong wind conditions, the airbag 54 can also reduce the flow rate of wind through the inside of the outer casing 1, reducing the temperature of the wind and causing the condensation beads on the surface of the cable to freeze again.

[0035] 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 high-precision long-duration occasional partial discharge diagnostic positioning device, comprising a housing (1) movable on a cable, characterized in that: Also includes: An ultrasonic detector (14), wherein the ultrasonic detector (14) is mounted on the housing (1); A vibration mechanism, the vibration mechanism comprising a buffer assembly, the input end of the buffer assembly is located outside the housing (1), and the output end is located inside the housing (1) and is connected to a piston cylinder (3), the piston cylinder (3) is fixedly connected to the housing (1), and one end thereof penetrates through a sealing and sliding connection with a piston column (31), the piston cylinder (3) is connected to a knocking assembly, the friction between the piston column (31) and the piston cylinder (3) is greater than the friction of the internal structure of the knocking assembly, one end of the piston column (31) extending out of the piston cylinder (3) is fixedly connected to a damping plate (32), and the output end of the knocking assembly and the damping plate (32) are both spaced to cooperate with a cable.

2. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 1, characterized in that: A moving mechanism is connected inside the housing (1), and the moving mechanism comprises a controller (11). The controller (11) is mounted on the top of the housing (1). The top of the housing (1) is rotatably connected to a support roller (12), and the bottom of the housing (1) is rotatably connected to a drive roller (13). The output end of the controller (11) is coaxially fixedly connected to one end of the drive roller (13), and is used to control the drive roller (13) to rotate to a position where opposite sides of the support roller (12) and the drive roller (13) are pressed against the cable.

3. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 1, characterized in that: The ultrasonic detectors (14) include two, and the two ultrasonic detectors (14) are mounted on two sides of the housing (1) in a one-to-one correspondence. The ultrasonic detectors (14) are used to detect and locate the cable.

4. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 1, characterized in that: The buffer assembly comprises two buffer plates (21), the two buffer plates (21) are distributed on both outer sides of the housing (1) in a one-to-one correspondence, and the opposite sides are fixedly connected to a hydraulic plate (22) via a buffer column, the two outer side walls of the housing (1) are fixedly connected to a buffer cylinder (2), the two hydraulic plates (22) are sealed and slidably connected in the two buffer cylinders (2) in a one-to-one correspondence, the side of the buffer cylinder (2) away from the hydraulic plate (22) is connected to a fixed pipe (23), and the end of the fixed pipe (23) away from the buffer cylinder (2) is connected to the piston cylinder (3); the knocking assembly comprises a connecting pipe ( 33), the top of the piston cylinder (3) is connected to the middle of the connecting tube (33) through a branch tube, and both ends of the connecting tube (33) are connected to a fixed cylinder (4), the fixed cylinder (4) is fixedly connected to the inner wall of the housing (1), and is sealed and slidably connected to an extrusion plate (41) inside, a spring (43) is fixedly connected between the extrusion plate (41) and the inner wall of the fixed cylinder (4), and the extrusion plate (41) is fixedly connected to a knocking block (42) at one end away from the connecting tube (33) through a connecting column that seals and penetrates the fixed cylinder (4), and four knocking blocks (42) extend out of one end of the fixed cylinder (4) and are spaced apart from the outer side of the cable.

5. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 4, characterized in that: The interiors of the mutually communicating parts of the buffer cylinder (2), the piston cylinder (3) and the fixed cylinder (4) are all filled with hydraulic oil.

6. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 4, characterized in that: The two buffer cylinders (2) are connected to each other via a common connecting pipe (24) at the side away from the buffer plate (21), and the housing (1) is provided with slots for the branch pipe and the connecting pipe (24) to pass through.

7. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 4, characterized in that: The four striking blocks (42) are distributed in a circular array at intervals on the outer circumference of the cable, wherein the branch pipe, the connecting pipe (33) and the fixing tube (4) are all distributed in a centrally symmetrical manner about the cable axis.

8. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 1, characterized in that: It also includes a windshield mechanism, the windshield mechanism including a mounting block (5), two mounting blocks (5) being fixedly connected to the top and bottom of the housing (1) in a one-to-one correspondence, an inner cavity being opened in the mounting block (5), both ends of the inner cavity being sealed and slidably connected with movable plates (52), one end of the movable plate (52) away from the inner cavity being fixedly connected with a windshield block, one end of the windshield block away from the movable plate (52) being sealed and passing through the mounting block (5) and being fixedly connected with a windshield plate (51), and air bags (54) being connected to opposite sides of the two inner cavities, the air bags (54) being located between the mounting block (5) and the cable.

9. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 8, characterized in that: The airbags (54) include a plurality of airbags (54), and the plurality of airbags (54) are evenly spaced and distributed on the mounting block (5).

10. A high-precision long-duration sporadic partial discharge diagnosis and positioning device according to claim 8, characterized in that: A plurality of recoverable dampers (53) are installed between the wind deflector (51) and the mounting block (5).

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