High-voltage direct-current excitation signal source for PDC test of cable and use method thereof

Abstract

The invention relates to a high-voltage direct-current excitation signal source for a cable PDC test and a use method thereof.The high-voltage direct-current excitation signal source comprises a signal generation device and a protection box, a placement plate used for supporting the signal generation device is arranged in the protection box, and the bottom of the placement plate is rotatably connected to a sliding sleeve through a connection module; a guide module for the sliding sleeve to slide is arranged at the bottom of the protection box, and a damping telescopic rod is connected between the sliding sleeve and the interior of the protection box; an equipment extrusion module is rotationally mounted on the upper end surface of the placement plate through a supporting mechanism in a penetrating manner; a heat dissipation channel communicated with the interior is fixedly installed on the upper end face of the protection box, a heat dissipation fan is fixedly connected into the heat dissipation channel, a filter screen assembly is fixedly installed on the upper end face of the heat dissipation channel, a reciprocating motion mechanism is installed on the outer side of the upper end face of the protection box, and a cleaning brush located on the surface of the filter screen assembly is installed at the output end of the reciprocating motion mechanism. Compared with the prior art, the signal generating device has the advantages that the heat dissipation effect of the signal generating device is improved, vibration is absorbed and buffered, and the signal generating device is more stable and reliable.

Description

Technical Field

[0001] This invention relates to the field of cable PDC field application testing equipment, and in particular to a high-voltage DC excitation signal source for cable PDC testing and its usage method. Background Technology

[0002] Cable PDC field application testing refers to the on-site inspection of cables using the polarization-depolarization current (PDC) test method. It is mainly used to determine whether the cable has water tree aging. Low distortion high voltage DC excitation signal source is a device that can provide low distortion, high voltage DC signal and is usually used in various testing and measurement scenarios.

[0003] A low-distortion high-voltage DC excitation signal source is a type of signal generator. It features low distortion and high voltage, and can output high-quality DC signals. This type of signal source is commonly used to verify frequency relays, synchronous relays, etc., and can also be used as a low-frequency inverter power supply. In cable PDC field application testing, the signal generation equipment has many internal electronic components. During transportation, vibrations to the signal generation equipment can easily damage the electronic components, rendering them unusable. Furthermore, the electronic components generate a lot of heat, and prolonged use can easily lead to overheating.

[0004] In existing technologies, most signal generating devices rely on natural heat dissipation through ventilation holes. Natural heat dissipation is slow and cannot quickly dissipate heat when the signal generating device overheats. The electronic components inside the signal generating device are at high risk of burning out due to continuous operation under overheating conditions, which is detrimental to the safe use of the signal generating device and affects the normal conduct of cable PDC field application testing. Therefore, it is necessary to redesign a low-distortion high-voltage DC excitation signal source suitable for cable PDC field application testing to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art by providing a high-voltage DC excitation signal source for cable PDC testing and its usage method, ensuring the stability of the signal generating equipment during transportation and the heat dissipation effect during use, making it more stable and reliable.

[0006] The objective of this invention can be achieved through the following technical solutions: A high-voltage DC excitation signal source for cable PDC testing includes a signal generating device and a protective box. The protective box contains a mounting plate for supporting the signal generating device. The bottom of the mounting plate is rotatably connected to a sliding sleeve via a connecting module. The bottom of the protective box has a guide module for the sliding sleeve to slide. A damping telescopic rod parallel to the sliding direction of the sliding sleeve is connected between the sliding sleeve and the interior of the protective box. A device compression module for length adjustment via bolts is rotatably installed through the upper end face of the mounting plate via a support mechanism. This device compression module faces the signal generating device. A heat dissipation channel communicating with the interior is fixedly installed on the upper end face of the protective box. A cooling fan is fixedly connected within the heat dissipation channel. A filter assembly is fixedly installed on the upper end face of the heat dissipation channel. A reciprocating moving mechanism is installed on the outer side of the upper end face of the protective box. A cleaning brush located on the surface of the filter assembly is installed at the output end of the reciprocating moving mechanism.

[0007] Furthermore, the support mechanism includes a support plate fixedly mounted on the upper surface of the placement plate; The extrusion module of the equipment includes a bolt, a connecting block, and an extrusion plate. The connecting block is installed at the end of the bolt and is rotatably connected to the outer wall of the extrusion plate. The bolt passes through the support plate by threaded rotation. The outer wall of the protective box is provided with a movable opening that cooperates with the bolt. The movable opening is a vertically upward strip. One end of the bolt is located outside the protective box, and the other end is connected to the extrusion plate through the connecting block.

[0008] Furthermore, there are two of each of the support mechanism and the equipment extrusion module, located on both sides of the signal generating device.

[0009] Furthermore, the connecting module includes a first connecting frame, a second connecting frame, and a connecting plate. The first connecting frame is fixed on the sliding sleeve, the second connecting frame is fixed on the bottom of the placement plate, and the connecting plate is rotatably connected to the interior of the first connecting frame and the second connecting frame.

[0010] Furthermore, there are two sliding sleeves, and each sliding sleeve is connected to a corresponding connecting module.

[0011] Furthermore, the reciprocating moving mechanism includes two fixed plates fixed to the upper end face of the protective box, and a reciprocating screw rotatably installed between the two fixed plates. A motor connected to the reciprocating screw is fixedly installed on the outer wall of one of the fixed plates. A screw sleeve is rotatably installed on the outer wall of the reciprocating screw. A limit rod is fixedly installed between the two fixed plates. The limit rod slides through the screw sleeve. The cleaning brush is fixedly installed on the bottom wall of the screw sleeve.

[0012] Furthermore, the filter assembly includes a filter plate fixedly installed on the upper surface of the heat dissipation channel, and a filter cloth fixedly installed on the upper surface of the filter plate.

[0013] Furthermore, the guide module includes a slide bar and a stabilizing bar fixedly installed inside the protective box, both of which slide through the sliding sleeve.

[0014] Furthermore, the protective box has multiple wiring openings on its back that communicate with the interior, and each wiring opening has a junction box fixedly installed inside.

[0015] The present invention also provides a method for using the high-voltage DC excitation signal source for cable PDC testing as described above, comprising the following steps: Place the signal generating device on the upper surface of the placement plate; The signal generating device is clamped by rotating the device squeezing module; When vibration occurs during the carrying of the signal generating device, the placement plate will exert force through the connecting module, causing the sliding sleeve to slide. During the sliding process, the sliding sleeve will press the damping telescopic rod to absorb and buffer the force. During the use of the signal generating equipment, a cooling fan blows air to cool the equipment, and a filter assembly intercepts and filters dust in the air. When dust accumulates on the filter assembly and affects ventilation, a reciprocating moving mechanism drives a cleaning brush to move across the surface of the filter assembly to clean the dust.

[0016] Compared with the prior art, the present invention has the following advantages: (1) The present invention places the signal generating device inside the protective box and supports the signal generating device by placing the plate. By setting up components such as sliding sleeve, sliding rod and damping telescopic rod, during the carrying of the signal generating device, the first connecting frame is subjected to force and can drive the sliding sleeve to slide on the outer wall of the sliding rod through the cooperation of the stabilizing rod. During the sliding process, the damping telescopic rod is squeezed, thereby absorbing and buffering the force, thus preventing the signal generating device from being unable to be used normally due to vibration. By incorporating components such as a cooling fan, a reciprocating screw, and a cleaning brush, the cooling fan can dissipate heat by blowing air onto the filter cloth. When the reciprocating screw rotates, it can move the screw sleeve through its interaction with the limit rod. As the screw sleeve moves, it can move the cleaning brush, thereby allowing the cleaning brush to clean the dust on the surface of the filter cloth, thus avoiding reducing the heat dissipation effect on the signal generating equipment.

[0017] (2) The present invention clamps the signal generating device from both sides by extrusion plates, and absorbs and buffers the bottom vibration of the signal generating device by components such as sliding sleeves, sliding rods and damping telescopic rods, thus ensuring the stability of the signal generating device during transportation. The installation of a cooling fan provides auxiliary heat dissipation for the signal generating equipment, while components such as a reciprocating screw and cleaning brushes remove dust from the filter plate, ensuring effective heat dissipation and making the signal generating equipment more stable and reliable in operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a high-voltage DC excitation signal source for cable PDC testing provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the vertical section structure; Figure 3 This is a side view of a high-voltage DC excitation signal source for cable PDC testing provided in an embodiment of the present invention; Figure 4 for Figure 3 A schematic diagram of the vertical section structure; Figure 5 This is a top view schematic diagram of a high-voltage DC excitation signal source for cable PDC testing provided in an embodiment of the present invention; Figure 6 for Figure 2 Enlarged schematic diagram of the structure at point A in the diagram; Figure 7 for Figure 2 Enlarged schematic diagram of the structure at point B in the diagram; Figure 8 for Figure 4 Enlarged schematic diagram of the structure at point C; In the diagram, 1. Signal generating device, 2. Protective box, 3. Sliding rod, 4. Stabilizing rod, 5. Sliding sleeve, 6. Damping telescopic rod, 7. First connecting frame, 8. Connecting plate, 9. Second connecting frame, 10. Placement plate, 11. Support plate, 12. Bolt, 13. Connecting block, 14. Extrusion plate, 15. Anti-slip pad, 16. Heat dissipation channel, 17. Fixing rod, 18. Cooling fan, 19. Filter screen plate, 20. Filter cloth, 21. Fixing plate, 22. Reciprocating screw, 23. Motor, 24. Limiting rod, 25. Screw sleeve, 26. Cleaning brush, 27. Junction box. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] Example 1 like Figures 1-4 As shown, this embodiment provides a high voltage DC excitation signal source for cable PDC testing, including a signal generating device 1 and a protective box 2. The protective box 2 is provided with a placement plate 10 for supporting the signal generating device 1. The bottom of the placement plate 10 is rotatably connected to the sliding sleeve 5 through a connecting module. The bottom of the protective box 2 is provided with a guide module for the sliding sleeve to slide. A damping telescopic rod 6 parallel to the sliding direction of the sliding sleeve is connected between the sliding sleeve 5 and the interior of the protective box 2. The upper end face of the placement plate 10 is rotatably mounted with a device extrusion module for length adjustment by bolts through a support mechanism. The device extrusion module is directly facing the signal generating device 1. A heat dissipation channel 16 communicating with the interior is fixedly installed on the upper end face of the protective box 2. A cooling fan 18 is fixedly connected inside the heat dissipation channel 16. A filter assembly is fixedly installed on the upper end face of the heat dissipation channel 16. A reciprocating moving mechanism is installed on the outer side of the upper end face of the protective box 2. A cleaning brush 26 located on the surface of the filter assembly is installed at the output end of the reciprocating moving mechanism.

[0026] Preferred, such as Figure 6 As shown, the connecting module includes a first connecting frame 7, a second connecting frame 9, and a connecting plate 8. The first connecting frame 7 is fixed on the sliding sleeve 5, the second connecting frame 9 is fixed on the bottom of the placement plate 10, and the connecting plate 8 is rotatably connected to the interior of the first connecting frame 7 and the second connecting frame 9 respectively.

[0027] The guide module includes a slide bar 3 and a stabilizer bar 4 fixedly installed inside the protective box 2. Both the slide bar 3 and the stabilizer bar 4 slide through the sliding sleeve 5. Through the cooperation of the slide bar 3 and the stabilizer bar 4, it is ensured that the sliding sleeve 5 can only move horizontally along the slide bar. The stabilizer bar 4 is designed to be thinner than the slide bar 3.

[0028] In this embodiment, there are two sliding sleeves 5, and each sliding sleeve 5 is connected to a corresponding connecting module.

[0029] Specifically, a sliding rod 3 is fixedly installed inside the protective box 2. Two sliding sleeves 5 are slidably installed on the outer wall of the sliding rod 3 through a stabilizing mechanism. The stabilizing mechanism includes a stabilizing rod 4 fixedly installed inside the protective box 2, which slides through the two sliding sleeves 5. Damping telescopic rods 6 are fixedly installed on the inner walls of both sides of the protective box 2. The telescopic ends of the two damping telescopic rods 6 are fixedly connected to the outer wall of the sliding sleeve 5 on the same side, respectively. A first connecting frame 7 is fixedly installed on the upper surface of each of the two sliding sleeves 5. A second connecting frame 9 is rotatably connected inside each of the two first connecting frames 7 through a connecting mechanism. The connecting mechanism includes a connecting plate 8 rotatably installed inside the first connecting frame 7, and the end of the connecting plate 8 is rotatably connected to the inside of the second connecting frame 9. A placement plate 10 is fixedly installed on the outer wall of the two second connecting frames 9. The signal generating device 1 is slidably installed on the upper surface of the placement plate 10.

[0030] Preferred, such as Figure 7 As shown, the support mechanism includes a support plate 11 that is fixedly installed on the upper surface of the placement plate 10; The extrusion module of the equipment includes a bolt 12, a connecting block 13, and an extrusion plate 14. The connecting block 13 is installed at the end of the bolt 12 and the end of the connecting block 13 is rotatably connected to the outer wall of the extrusion plate 14. The bolt 12 passes through the support plate 11 through the threaded rotation. The outer wall of the protective box 2 is provided with a movable opening that cooperates with the bolt 12. The movable opening is a vertically upward strip that allows the support plate 11 to move up and down. One end of the bolt 12 is located outside the protective box 2, and the other end is connected to the extrusion plate 14 through the connecting block 13.

[0031] In this embodiment, there are two support mechanisms and two extrusion modules, located on both sides of the signal generating device 1.

[0032] Specifically, two bolts 12 are rotatably installed on the upper surface of the placement plate 10 through a support mechanism. The support mechanism includes a support plate 11 fixedly installed on the upper surface of the placement plate 10. The bolts 12 are rotatably installed through the support plate 11 through the thread. The outer wall of the protective box 2 has a movable opening that cooperates with the bolts 12. The ends of the two bolts 12 are rotatably connected to the pressing plates 14 through a connecting mechanism. The connecting mechanism includes a connecting block 13 fixedly installed on the end of the bolts 12. The end of the connecting block 13 is rotatably connected to the outer wall of the pressing plate 14. Anti-slip pads 15 are fixedly installed on the inner walls of the two pressing plates 14.

[0033] Preferred, such as Figure 5 and Figure 8 As shown, the reciprocating moving mechanism includes two fixed plates 21 fixed to the upper end face of the protective box 2, and a reciprocating screw 22 rotatably installed between the two fixed plates 21. A motor 23 connected to the reciprocating screw 22 is fixedly installed on the outer wall of one of the fixed plates 21. A screw sleeve 25 is rotatably installed on the outer wall of the reciprocating screw 22. A limit rod 24 is fixedly installed between the two fixed plates 21. The limit rod 24 slides through the screw sleeve 25. A cleaning brush 26 is fixedly installed on the bottom wall of the screw sleeve 25.

[0034] The filter assembly includes a filter plate 19 fixedly installed on the upper surface of the heat dissipation channel 16, and a filter cloth 20 fixedly installed on the upper surface of the filter plate 19. Dust is removed by sliding a cleaning brush 26 on the filter cloth 20.

[0035] Specifically, in this embodiment, a heat dissipation channel 16 communicating with the interior is fixedly installed on the upper surface of the protective box 2. Cooling fans 18 are fixedly connected to both inner walls of the heat dissipation channel 16 through a fixing mechanism. The fixing mechanism includes a fixing rod 17 fixedly installed on the inner wall of the heat dissipation channel 16, and the end of the fixing rod 17 is fixedly connected to the outer wall of the cooling fan 18.

[0036] A filter screen plate 19 is fixedly installed on the upper end face of the heat dissipation channel 16, and a filter cloth 20 is fixedly installed on the upper end face of the filter screen plate 19. A reciprocating screw 22 is rotatably installed on the upper end face of the protective box 2 via two fixed plates 21. A motor 23 connected to the reciprocating screw 22 is fixedly installed on the outer wall of one of the fixed plates 21. A screw sleeve 25 is rotatably installed on the outer wall of the reciprocating screw 22. A limit rod 24 is fixedly installed between the two fixed plates 21. The limit rod 24 slides through the screw sleeve 25 and can limit the screw sleeve 25, so that the screw sleeve 25 can only move axially along the outer wall of the reciprocating screw 22. A cleaning brush 26 is fixedly installed on the bottom wall of the screw sleeve 25.

[0037] Preferably, the back of the protective box 2 has multiple wiring openings that communicate with the interior. Each wiring opening has a junction box 27 fixedly installed inside, which can be connected to the internal signal generating device 1 to realize signal transmission and power supply.

[0038] Example 2 This embodiment provides a method for using a high-voltage DC excitation signal source for cable PDC testing as described in Embodiment 1, including the following steps: Place the signal generating device 1 on the upper surface of the placement plate 10; The signal generating device 1 is clamped by the rotating extrusion module; When vibration occurs during the carrying of signal generating device 1, the placement plate 10 applies force through the connecting module, causing the sliding sleeve 5 to slide. During the sliding process, the sliding sleeve 5 presses against the damping telescopic rod 6, absorbing and buffering the force. During the use of signal generating device 1, cooling fan 18 blows air to cool the signal generating device 1, and filter screen assembly intercepts and filters dust in the air; when dust accumulated on the filter screen assembly affects ventilation, reciprocating moving mechanism drives cleaning brush 26 to move on the surface of filter screen assembly to clean the dust.

[0039] Specifically, during the use of the above-mentioned high-voltage DC excitation signal source, the signal generating device 1 is placed on the upper surface of the placement plate 10, and then the bolts 12 on both sides can be turned. This allows the two bolts 12 to move the pressing plate 14 on the same side through the cooperation of the connecting block 13. This allows the pressing plates 14 on both sides to move closer to each other and clamp the signal generating device 1 through the anti-slip pad 15. This enables convenient installation and fixation of the signal generating device 1 inside the protective box 2. When vibration occurs during the carrying of the signal generating device 1, the placement plate 10 can transmit the force to the first connecting frame 7 through the cooperation of the second connecting frame 9 and the connecting plate 8. The first connecting frame 7, under the force, can drive the sliding sleeve 5 to slide on the outer wall of the sliding rod 3 through the cooperation of the stabilizing rod 4. During the sliding process, the damping telescopic rod 6 is squeezed, thereby absorbing and buffering the force, thus preventing the signal generating device 1 from being unable to be used normally due to vibration. During the use of signal generating device 1, the lines can be connected through multiple junction boxes 27. When the temperature is high during use, the cooling fan 18 can blow air to dissipate heat. During heat dissipation, the filter plate 19 and the filter cloth 20 work together to intercept and filter dust in the air. When the dust accumulated on the surface of the filter cloth 20 affects ventilation, the motor 23 can drive the reciprocating screw 22 to rotate. When the reciprocating screw 22 rotates, it can drive the screw sleeve 25 to move through the cooperation with the limit rod 24. When the screw sleeve 25 moves, it can drive the cleaning brush 26 to move, thereby allowing the cleaning brush 26 to clean the dust on the surface of the filter cloth 20, thus avoiding reducing the heat dissipation effect of signal generating device 1.

[0040] This solution places the signal generating device inside the protective box 2 and supports the signal generating device 1 with the placement plate 10. By setting up components such as the sliding sleeve 5, the sliding rod 3 and the damping telescopic rod 6, during the carrying of the signal generating device 1, the first connecting frame 7 can be driven by the force to move the sliding sleeve to slide on the outer wall of the sliding rod through the cooperation of the stabilizing rod, and squeeze the damping telescopic rod during the sliding process. This can absorb and buffer the force, thereby preventing the signal generating device from being unable to work properly due to vibration. By setting up components such as a cooling fan 18, a reciprocating screw 22, and a cleaning brush 26, the cooling fan can blow air to dissipate heat. When the reciprocating screw rotates, it can drive the screw sleeve to move through cooperation with the limit rod. When the screw sleeve moves, it can drive the cleaning brush to move, thereby enabling the cleaning brush to clean the dust on the surface of the filter cloth, thus avoiding reducing the heat dissipation effect on the signal generating equipment.

[0041] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A high-voltage DC excitation signal source for cable PDC testing, comprising a signal generating device (1) and a protective box (2), characterized in that, The protective box (2) is internally provided with a placing plate (10) for supporting a signal generating device (1), the bottom of the placing plate (10) is rotatably connected to the sliding sleeve (5) through a connecting module, the bottom of the protective box (2) is provided with a guiding module for the sliding of the sliding sleeve, and a damping telescopic rod (6) parallel to the sliding direction of the sliding sleeve is connected between the sliding sleeve (5) and the interior of the protective box (2); the upper end surface of the placing plate (10) is rotatably penetrated and installed with a device extruding module for length adjustment through a bolt through a supporting mechanism, the device extruding module is opposite to the signal generating device (1); the upper end surface of the protective box (2) is fixedly installed with a heat dissipation channel (16) in communication with the interior, the heat dissipation channel (16) is fixedly connected with a heat dissipation fan (18), the upper end surface of the heat dissipation channel (16) is fixedly installed with a filter screen assembly, and the upper end surface of the protective box (2) is installed with a reciprocating moving mechanism outside, and the output end of the reciprocating moving mechanism is installed with a cleaning brush (26) on the surface of the filter screen assembly.

2. A high voltage DC excitation signal source for cable PDC testing according to claim 1, characterized in that, The supporting mechanism comprises a supporting plate (11) fixedly installed on the upper end surface of the placing plate (10); The device extruding module comprises a bolt (12), a connecting block (13) and an extruding plate (14), the connecting block (13) is installed at the end of the bolt (12), the end of the connecting block (13) is rotatably connected to the outer wall of the extruding plate (14), the bolt (12) is rotatably penetrated through the supporting plate (11) through threads, the outer wall of the protective box (2) is provided with a moving opening matched with the bolt (12), the moving opening is vertically upward and in a long strip shape, one end of the bolt (12) is located outside the protective box (2), and the other end is connected to the extruding plate (14) through the connecting block (13).

3. A high voltage DC excitation signal source for cable PDC testing according to claim 2, characterized in that, The number of the supporting mechanism and the device extruding module is both two, and they are respectively located on the two sides of the signal generating device (1).

4. A high voltage DC excitation signal source for cable PDC testing according to claim 1, characterized in that, The connecting module comprises a first connecting frame (7), a second connecting frame (9) and a connecting plate (8), the first connecting frame (7) is fixed to the sliding sleeve (5), the second connecting frame (9) is fixed to the bottom of the placing plate (10), and the connecting plate (8) is rotatably connected to the interiors of the first connecting frame (7) and the second connecting frame (9) respectively.

5. A high voltage DC excitation signal source for cable PDC testing according to claim 1, characterized in that, The number of the sliding sleeve (5) is two, and each sliding sleeve (5) is connected with a corresponding connecting module.

6. A high voltage DC excitation signal source for cable PDC testing according to claim 1, characterized in that, The reciprocating moving mechanism comprises two fixed plates (21) fixed to the upper end surface of the protective box (2), and a reciprocating lead screw (22) rotatably installed between the two fixed plates (21), the outer wall of one of the fixed plates (21) is fixedly installed with a motor (23) connected with the reciprocating lead screw (22), the outer wall of the reciprocating lead screw (22) is rotatably installed with a lead screw sleeve (25), a limiting rod (24) is fixedly installed between the two fixed plates (21), the limiting rod (24) is slidably penetrated through the lead screw sleeve (25), and the cleaning brush (26) is fixedly installed on the bottom wall of the lead screw sleeve (25).

7. A high voltage DC excitation signal source for cable PDC testing according to claim 1, characterized in that, The filter screen assembly comprises a filter screen plate (19) fixedly installed on the upper end face of the heat dissipation channel (16), and a filter cloth (20) fixedly installed on the upper end face of the filter screen plate (19).

8. A high voltage DC excitation signal source for cable PDC testing according to claim 1, characterized in that, The guide module comprises a sliding rod (3) and a stabilizing rod (4) fixedly installed inside the protection box (2), and the sliding rod (3) and the stabilizing rod (4) both slide through the sliding sleeve (5).

9. A high voltage DC excitation signal source for cable PDC testing according to claim 1, characterized in that, A plurality of wire connection openings are formed in the back face of the protection box (2) and communicate with the inside of the protection box (2), and each wire connection opening is fixedly installed with a wire connection box (27).

10. A method of using a high voltage DC excitation signal source for cable PDC testing according to any one of claims 1-9, characterized in that, The method comprises the following steps: The signal generating device (1) is placed on the upper end face of the placing plate (10); The signal generating device (1) is clamped by rotating the device extrusion module; When vibration is generated during the carrying of the signal generating device (1), the placing plate (10) transmits the force to the sliding sleeve (5) through the connecting module, and drives the sliding sleeve (5) to slide, and the sliding sleeve (5) extrudes the damping telescopic rod (6) during the sliding process, so that the force is absorbed and buffered; During the use of the signal generating device (1), the signal generating device (1) is blown and cooled by the cooling fan (18), and the dust in the air is intercepted and filtered by the filter screen assembly; when the dust accumulated on the filter screen assembly affects the ventilation, the cleaning brush (26) is driven by the reciprocating moving mechanism to move on the surface of the filter screen assembly, so that the dust is cleaned.

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