A partial discharge detection device and method of use thereof

Abstract

This invention relates to the field of power testing equipment technology, specifically to a partial discharge detection device and its usage method. The device includes a movable base, a supporting chassis on the upper side of the movable base, several adjustable supporting feet around the supporting chassis, a detection body on the upper side of the movable supporting chassis, a guide rail frame vertically mounted on the upper side of the detection body, a movable seat mounted on the guide rail frame, a rotating disk surrounding the guide rail frame on the upper side of the movable seat, and a first electric telescopic rod horizontally mounted on the rotating disk. A detection end is mounted on the telescopic end of the first electric telescopic rod, and the detection end is electrically connected to the detection body. This invention solves the problem in the prior art where a single partial discharge detection device is insufficient for detecting complex lines and numerous devices in a power generation system.

Description

Technical Field

[0001] This invention relates to the field of power detection equipment technology, specifically to a partial discharge detection device and its usage method. Background Technology

[0002] In power generation systems, which include generator sets, transformers, and various transmission lines, partial discharge may occur during long-term operation due to insulation aging, manufacturing defects, mechanical damage, or environmental factors such as humidity and chemical corrosion. Partial discharge is an early sign of insulation deterioration. Accurate detection of partial discharge is crucial for the safety and reliability of each piece of equipment in the power generation system. If it is not detected in time, it will gradually erode the insulation material, eventually leading to cable breakdown or short circuit, unit failure, and other situations, causing large-scale power outages or even safety accidents.

[0003] In the existing technology, there are various partial discharge detection devices that can be used to detect partial discharge. However, the power generation system has complex circuits and numerous devices, making it difficult for a single partial discharge detection device to perform comprehensive detection. Summary of the Invention

[0004] The purpose of this invention is to provide a partial discharge detection device that solves the problem that in the prior art, a single partial discharge detection device is difficult to detect the complex circuits and numerous devices in a power generation system.

[0005] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is as follows:

[0006] A partial discharge detection device includes a movable base, a support chassis on the upper side of the movable base, a plurality of adjustable support feet around the support chassis, a detection body on the upper side of the movable support chassis, a guide rail frame vertically arranged on the upper side of the detection body, a movable seat mounted on the guide rail frame, a rotating disk arranged around the upper side of the movable seat on the guide rail frame, a first electric telescopic rod horizontally arranged on the rotating disk, a detection end installed at the telescopic end of the first electric telescopic rod, and the detection end being electrically connected to the detection body.

[0007] A further technical solution is that the support frame has a "T" shaped cross section, a rack is vertically arranged on one side of the support frame, a moving seat is provided with a moving hole that passes through the upper and lower sides, multiple guide wheels are provided on the wall of the moving hole, multiple guide grooves are arranged vertically around the support frame, the multiple guide wheels are respectively rolled in the multiple guide grooves, a first servo motor is provided in the moving seat, a first gear is installed on the output shaft of the first servo motor, and the first gear is meshed with the rack.

[0008] A further technical solution is that the lower side of the rotating disk is rotatably connected to the upper side of the moving seat through a plane bearing. The upper ring of the plane bearing is connected to the lower side of the rotating disk, and the lower ring of the plane bearing is connected to the upper side of the moving seat. An external gear ring is provided on the outer wall of the upper ring of the plane bearing. A second servo motor is installed on the outer side of the moving seat. A second gear is installed on the output shaft of the second servo motor, and the second gear meshes with the external gear ring.

[0009] A further technical solution involves a winding section on the upper side of the detection body, within which a winding cavity is located. A winding shaft is horizontally positioned near the top of the winding cavity and is driven by a third servo motor. An outlet connected to the winding cavity is located on the upper side of the winding section. A first rod is vertically mounted on the top of the winding cavity, with a detection hole at its lower end. A second rod slides vertically within the detection hole, and a pressure sensor is located at the bottom of the detection hole. The upper end of the second rod abuts against the pressure sensor via a first spring, and the lower end of the second rod is connected to a pulley below the first rod. A first communication line is wound on the winding shaft. One end of the first communication line is electrically connected to the detection body, and the other end passes under the pulley, exits through the outlet, and is fixed to the side of the moving base by a fixing block. The detection end is electrically connected to the first communication line via a second communication line, which is a spring wire.

[0010] A further technical solution is that the adjustable support foot includes a second electric telescopic rod, a first foot, and a second foot. A mounting cavity is provided inside the support chassis. The fixed end of the second electric telescopic rod is installed in the mounting cavity. The telescopic end of the second electric telescopic rod passes through the mounting cavity and is connected to the upper end of the first foot. An adjustment hole is provided at the lower end of the first foot. The second foot is slidably installed in the adjustment hole. The upper end of the second foot is connected to the bottom of the adjustment hole through a second spring. A roller is connected to the lower end of the second foot below the first foot.

[0011] A further technical solution is to install a first camera on the front side of the detection body and a second camera on the upper side of the first electric telescopic rod.

[0012] The second technical solution adopted in this invention is:

[0013] A partial discharge detection method, using the partial discharge detection device as described in the first technical solution, includes the following steps: Step S1, controlling the movable base to move to the area to be detected; Step S2, controlling the extension and retraction of the second electric telescopic rod according to the target detection height, driving the first and second supports to unfold outwards, so that the rollers contact the ground and compress the second spring, expanding the support area of ​​the support chassis; Step S3, starting the first servo motor, driving the movable base to move up and down along the guide rail frame through the meshing transmission of the first gear and rack, while the guide wheel rolls and guides in the guide groove, adjusting the detection end to the target height; Step S4, during the lifting and lowering process of the movable base, the third... A servo motor drives the winding shaft to rotate synchronously, releasing or winding the first communication line; simultaneously, a pressure sensor monitors the pressure value of the first spring in real time, adjusting the speed of the third servo motor to keep the first communication line taut; in step S5, the first electric telescopic rod is controlled to extend and retract, moving the detection end horizontally to the target detection position, bringing the detection end close to the device under test; in step S6, the second servo motor is started, and through the meshing transmission of the second gear and the external gear ring, the rotating disk is driven to rotate horizontally around the guide rail frame, driving the first electric telescopic rod and the detection end to perform circumferential scanning detection; in step S7, the partial discharge signal is collected through the detection end and transmitted to the detection body via the second and first communication lines.

[0014] In step S4, when the moving seat rises, if the pressure value detected by the pressure sensor increases and exceeds the preset threshold, the speed of the third servo motor is increased to speed up the wire feeding; if the pressure value decreases, the speed of the third servo motor is decreased to slow down the wire feeding and prevent the first communication line from breaking or loosening.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present application can move the detection body and detection end within the inspection area by means of a movable base. The operator can remotely control the partial discharge of the area to perform remote detection without the need for manual back-and-forth inspection. 2. By setting a guide rail frame and a movable base, the electric detection end can move up and down, thereby performing partial discharge detection on equipment at different heights, confirming the location of the partial discharge, and facilitating subsequent maintenance. By setting a first electric telescopic rod, the electric detection end can move horizontally. This allows the electric detection end to approach and detect locations that the movable base cannot reach. By setting a support chassis and several adjustable support feet, the support area of ​​the movable base can be expanded by adjusting the support feet when the movable base rises, thereby improving the stability of the movable base and preventing tilting during the detection process. 3. By setting a rotating disk, it can work with the first electric telescopic rod to perform partial discharge detection on all locations within the radius of the length of the first electric telescopic rod, with the guide rail frame as the center. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a partial discharge detection device according to the present invention.

[0017] Figure 2 This is a schematic cross-sectional view of the movable seat of a partial discharge detection device according to the present invention.

[0018] Figure 3 This is a schematic diagram of the movable base and planar bearing of a partial discharge detection device according to the present invention.

[0019] Figure 4 This is a schematic diagram of the movable base and rotating disk of a partial discharge detection device according to the present invention.

[0020] Figure 5 This is a schematic cross-sectional view of the first and second rods of a partial discharge detection device according to the present invention.

[0021] Figure 6 This is a schematic cross-sectional view of the winding section of a partial discharge detection device according to the present invention.

[0022] Icons: 1-Moving base, 2-Support chassis, 3-Detection body, 4-Guide rail frame, 5-Moving seat, 6-Rotating disk, 7-First electric telescopic rod, 8-Detection end, 9-Rack, 10-Moving hole, 11-Guide wheel, 12-Guide groove, 13-First servo motor, 14-First gear, 15-Plane bearing, 16-External gear ring, 18-Second gear, 19-Winding part, 20-Winding cavity, 21-Winding shaft, 22-Outlet, 23-First rod body, 24-Detection hole, 25-Second rod body, 26-Pressure sensor, 27-First spring, 28-Pulley, 29-First communication line, 30-Fixing block, 31-Second communication line, 32-Second electric telescopic rod, 33-First support leg, 34-Second support leg, 35-Adjustment hole, 36-Second spring, 37-Roller, 38-First camera, 39-Second camera. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] Figures 1 to 6 The image shows an embodiment of the present invention.

[0025] Example 1:

[0026] A partial discharge detection device includes a movable base 1, a support chassis 2 on the upper side of the movable base 1, and several adjustable support feet around the support chassis 2. A detection body 3 is mounted on the upper side of the movable support chassis 2, a guide rail frame 4 is vertically mounted on the upper side of the detection body 3, a movable seat 5 is mounted on the guide rail frame 4, a rotating disk 6 is arranged around the upper side of the movable seat 5, and a first electric telescopic rod 7 is horizontally mounted on the rotating disk 6. A detection end 8 is installed at the telescopic end of the first electric telescopic rod 7 and is electrically connected to the detection body 3. This application allows the movable base 1 to move the detection body 3 and the detection end 8 within the inspection area. Operators can remotely detect partial discharge in the area through remote control, eliminating the need for manual reciprocating inspections. By setting up the guide rail frame 4 and the movable base 5, the electric detection end 8 can move up and down to perform partial discharge detection on equipment at different heights, confirming the location of partial discharge for subsequent maintenance. By setting up the first electric telescopic rod 7, the electric detection end 8 can move horizontally, allowing the electric detection end 8 to approach locations that the movable base 1 cannot reach. By setting up the support chassis 2 and several adjustable support feet, the support area of ​​the movable base 1 can be expanded by the adjustable support feet when the movable base 5 rises, thereby improving the stability of the movable base 1 and preventing tilting during the detection process. By setting up the rotating disk 6, it can work with the first electric telescopic rod 7 to perform partial discharge detection on all locations within the radius of the first electric telescopic rod 7 with the guide rail frame 4 as the center. The detection end 8 includes one or more combinations of high-frequency current sensors, ultra-high frequency sensors, ultrasonic sensors, and photoelectric sensors.

[0027] The support frame has a T-shaped cross-section. A rack 9 is vertically mounted on one side of the support frame. The movable seat 5 has a through-hole 10 extending to both the upper and lower sides. Multiple guide wheels 11 are mounted on the walls of the movable holes 10. Multiple guide grooves 12 are vertically arranged around the upper edge of the support frame, and the guide wheels 11 roll within each guide groove 12. A first servo motor 13 is installed inside the movable seat 5. A first gear 14 is mounted on the output shaft of the first servo motor 13, and the first gear 14 meshes with the rack 9. By driving the gear with the first servo motor 13, the movable seat 5 can move up and down along the rack 9. The cooperation of the multiple guide wheels 11 and guide grooves 12 ensures smooth up-and-down movement of the movable seat 5 without jamming. The T-shaped support frame enhances its strength, preventing bending due to excessive height, and maintains good strength while controlling its thickness. The support frame can be made of aluminum alloy, which has the characteristics of being lightweight and high-strength, thereby reducing the weight of the entire device. In addition, aluminum alloy can be well processed into the required shape and the guide groove 12 can be machined.

[0028] The lower side of the rotating disk 6 is rotatably connected to the upper side of the movable seat 5 via a plane bearing 15. The upper ring of the plane bearing 15 is connected to the lower side of the rotating disk 6, and the lower ring of the plane bearing 15 is connected to the upper side of the movable seat 5. An external gear ring 16 is provided on the outer wall of the upper ring of the plane bearing 15. A second servo motor is installed on the outer side of the movable seat 5, and a second gear 18 is installed on the output shaft of the second servo motor. The second gear 18 meshes with the external gear ring 16. After the movable seat 5 is raised to the moving height, the movable base 1 cannot be easily rotated to avoid tipping over. Therefore, the rotation of the rotating disk 6 drives the first electric telescopic rod 7 and the detection end 8 to rotate and move, realizing multi-angle detection. By setting the plane bearing 15, the stability and smoothness of the rotation of the rotating disk 6 can be improved.

[0029] The upper side of the detection body 3 is provided with a winding part 19, and a winding cavity 20 is provided inside the winding part 19. A winding shaft 21 is horizontally arranged near the top of the winding cavity 20. The winding shaft 21 is driven by a third servo motor. The upper side of the winding part 19 is provided with an outlet 22 that communicates with the winding cavity 20. A first rod 23 is vertically installed on the top of the winding cavity 20. A detection hole 24 is provided at the lower end of the first rod 23. A second rod 25 is slidably arranged up and down inside the detection hole 24. A pressure is provided at the bottom of the detection hole 24. Sensor 26 and the upper end of the second rod 25 are abutted by the first spring 27 and the pressure sensor 26. The lower end of the second rod 25 is connected to a pulley 28 below the first rod 23. A first communication line 29 is wound on the winding shaft 21. One end of the first communication line 29 is electrically connected to the detection body 3, and the other end passes under the pulley 28, exits from the outlet 22, and is fixed to the side of the moving base 5 by the fixing block 30. The detection end 8 is electrically connected to the first communication line 29 via a second communication line 31. The second communication line 31 is a spring wire. The detection body 3 and the detection end 8 use wired communication, which facilitates the detection body 3 to accurately collect the data detected by the detection end 8, and then transmits the data to a remote control console via wireless communication. The operator receives the data through the control console to realize partial discharge detection. To avoid the first communication line 29 from getting tangled or knotted during the up and down movement of the moving base 5. When the movable seat 5 rises, the third servo motor controls the winding shaft 21 to rotate, causing the first communication line 29 to rotate off the winding shaft 21 and pass out through the outlet 22, so that the first communication line 29 moves upward with the movable seat 5. Conversely, when it moves downward with the movable seat 5, the third servo motor rotates in the opposite direction to control the winding shaft 21 to rotate, so that the first communication line 29 is rewound onto the winding shaft 21. To prevent the first communication line 29 from becoming loose, tangled, or breaking during multiple ascents and descents if it cannot maintain effective tension, this application uses a first rod 23 and a second rod 25 in conjunction with a first spring 27 to keep the first communication line 29 taut at all times. A pressure sensor 26 determines the compression state of the first spring 27 by the second rod 25. Taking the ascent of the moving seat 5 as an example, an increase in pressure indicates that the ascent speed of the moving seat 5 exceeds the rotation speed of the winding shaft 21, requiring an increase in the rotation speed of the winding shaft 21 to prevent the first communication line 29 from breaking. Conversely, a decrease in pressure from the pressure sensor 26 indicates that the rotation speed of the winding shaft is too fast, requiring a decrease in rotation speed.

[0030] The adjustable support legs include a second electric telescopic rod 32, a first support leg 33, and a second support leg 34. A mounting cavity is provided within the support chassis 2. The fixed end of the second electric telescopic rod 32 is installed within the mounting cavity, and the telescopic end of the second electric telescopic rod 32 extends out of the mounting cavity and connects to the upper end of the first support leg 33. An adjustment hole 35 is provided at the lower end of the first support leg 33. The second support leg 34 is slidably installed within the adjustment hole 35. The upper end of the second support leg 34 is connected to the bottom of the adjustment hole 35 via a second spring 36, and a roller 37 is connected to the lower end of the second support leg 34 below the first support leg 33. When the movable seat 5 rises, the second electric telescopic rod 32 moves the first support leg 33 and the second support leg 34 away from the support chassis 2, thereby expanding the support area of ​​the entire support chassis 2 and improving the stability of the device. The second electric telescopic rod 32 is configured with its fixed end tilted downwards towards the telescopic end, forming an angle of 3-10 degrees with the horizontal plane. This allows the roller 37 to contact the ground as the second electric telescopic rod 32 extends, gradually compressing the second spring 36. When the second electric telescopic rod 32 shortens, the roller 37 separates from the ground, thus avoiding interference with the movement of the mobile chassis. The length of the second spring 36 is controlled to be at its shortest when the electric telescopic rod is at its longest extension, providing maximum stability and support.

[0031] A first camera 38 is installed on the front side of the detection body 3, and a second camera 39 is installed on the upper side of the first electric telescopic rod 7. By setting the first camera 38, it is convenient to view the front view when the moving base 1 moves forward. By setting the second camera 39, it is convenient to view the detection position during detection and record it by taking pictures.

[0032] Example 2:

[0033] A method for partial discharge detection based on a partial discharge detection device in Example 1.

[0034] This embodiment describes the specific operational procedures for conducting comprehensive partial discharge detection on transformers, switchgear, and transmission lines within a substation.

[0035] Detailed steps:

[0036] Step 1: Remote Movement and Initial Positioning. The operator controls the mobile base 1 via a remote control console, using the real-time image transmitted from the first camera 38 to move the device to the area to be tested in the substation. During the movement, the adjustable support legs are retracted, and the casters 37 are suspended in the air to avoid affecting the flexibility of movement.

[0037] Step Two: Adaptive Support Adjustment. Once the device reaches the target position, the system automatically calculates the required support area based on the preset detection height. The second electric telescopic rod 32 is extended downwards at a 5-degree angle to the horizontal plane, pushing the first support leg 33 and the second support leg 34 outwards. After the roller 37 contacts the ground, the second electric telescopic rod 32 continues to extend, compressing the second spring 36 to 80% of its maximum compression. At this point, the effective support radius of the support chassis 2 expands to 1.5 times its original size, significantly improving the device's anti-tipping capability.

[0038] Step 3: Multi-dimensional position adjustment. Start the first servo motor 13 to drive the moving seat 5 to rise along the guide rail frame 4. During this process, the guide wheel 11 rolls within the guide groove 12 to ensure smooth and unobstructed movement. Simultaneously, the third servo motor within the winding section 19 adjusts the unwinding speed of the winding shaft 21 in real time according to the rising speed of the moving seat 5.

[0039] Specifically, when the moving seat 5 rises at a speed of v, the wire release speed of the winding shaft 21 should be slightly greater than v, so that the second rod 25 slides downward within the detection hole 24, and the first spring 27 remains moderately compressed. The pressure sensor 26 monitors the pressure value in real time. If the pressure value exceeds a safety threshold such as 5N, the speed of the third servo motor is immediately increased; if the pressure value is lower than a relaxation threshold such as 1N, the speed is reduced to ensure that the first communication line 29 is always in a moderately taut state, avoiding cable tangling or breakage.

[0040] Step 4: Horizontal extension and rotation scanning. After the moving seat 5 reaches the target height, the first electric telescopic rod 7 is extended, pushing the detection end 8 to the vicinity of the surface of the device under test, 2-3 meters away from the center of the guide rail frame 4. Subsequently, the second servo motor is started, and through the meshing of the second gear 18 and the external gear ring 16, the rotating disk 6 is driven to rotate at a constant speed of 10 revolutions per minute.

[0041] During rotation, the high-frequency current sensor, ultra-high-frequency sensor, and ultrasonic sensor inside the detection end 8 work synchronously to perform a 360-degree scan detection of the cylindrical space with the guide rail frame 4 as the center and the length of the first electric telescopic rod 7 as the radius. The second camera 39 captures images of the detection points in real time and transmits them back to the detection body 3 synchronously with the sensor data.

[0042] Step 5: Layered detection and data fusion. After completing the detection of the current height layer, control the moving seat 5 to descend or ascend to a new height layer, repeating steps 3 and 4 to achieve comprehensive coverage of equipment at different heights. After receiving data from multiple sensors, the detection body 3 uses time-frequency domain analysis and pattern recognition algorithms to process the partial discharge signal. Combined with the visible light image captured by the second camera 39, it accurately locates the discharge point and determines the discharge type, such as corona discharge, surface discharge, or air gap discharge.

[0043] Step Six: Retraction and Transfer. After the test is completed, first shorten the first electric telescopic rod 7 to retract the test end 8, then control the second electric telescopic rod 32 to shorten, so that the adjustable support foot is retracted and the roller 37 is lifted off the ground. Finally, operate the mobile base 1 to transfer to the next test area.

[0044] Example 3:

[0045] Based on Embodiments 1 and 2, a method for fixed-point detection in narrow spaces is proposed. This device is used to perform fixed-point detection in narrow spaces such as switch cabinet gaps and cable trenches where the movable base 1 cannot directly enter.

[0046] Key points of operation:

[0047] 1. Indirect approach strategy: The mobile base 1 is positioned outside the entrance of the narrow space and securely supported by adjustable support feet. The mobile base 5 is raised to a suitable height, and the detection end 8 is horizontally extended into the narrow space using the telescopic capability of the first electric telescopic rod 7, reaching a depth of up to 3-4 meters.

[0048] 2. Angle fine-tuning detection: After the telescopic rod is fully extended, the rotating disk 6 is rotated at a small angle, such as ±30 degrees. With the image feedback from the second camera 39, the direction of the detection end 8 is fine-tuned to align with the suspected position for high-precision fixed-point detection.

[0049] 3. Cable tension protection: Since there may be sharp edges in the narrow space, the data of pressure sensor 26 is specially monitored during the extension and retraction process to ensure that the first communication line 29 maintains appropriate tension when passing through the outlet 22, so as to avoid scratching with the edge of the space.

[0050] Technical effect description.

[0051] Through the above-described method embodiments, this partial discharge detection method achieves the following technical effects:

[0052] Full-space coverage capability: Through the combined movement of three degrees of freedom—lifting, extending, and rotating—it achieves three-dimensional space-free detection of complex power equipment, solving the problem that traditional detection equipment is difficult to cover high, deep, and narrow places.

[0053] Dynamic stability assurance: The unfolded area of ​​the support legs is proportional to the detection height, ensuring the stability of the device when operating at heights, while not affecting the device's mobility.

[0054] Intelligent cable management: Based on a pressure feedback winding control algorithm, automatic tensioning of communication cables is achieved, avoiding the tedious manual cable management and extending the service life of the cables.

[0055] Remote autonomous operation: The entire inspection process can be completed through a remote control console, eliminating the need for operators to enter high-risk work areas and significantly improving the safety of inspection operations.

[0056] Although the invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter arrangement within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A partial discharge detection device, characterized in that, The device includes a movable base (1), a support chassis (2) is provided on the upper side of the movable base (1), and several adjustable support feet are provided around the support chassis (2). A detection body (3) is provided on the upper side of the movable support chassis (2). A guide rail frame (4) is provided vertically on the upper side of the detection body (3). A movable seat (5) is installed on the guide rail frame (4). A rotating disk (6) is provided around the guide rail frame (4) on the upper side of the movable seat (5). A first electric telescopic rod (7) is provided horizontally on the rotating disk (6). A detection end (8) is installed at the telescopic end of the first electric telescopic rod (7). The detection end (8) is electrically connected to the detection body (3).

2. The partial discharge detection device according to claim 1, characterized in that: The support frame has a "T" shaped cross section. A rack (9) is vertically arranged on one side of the support frame. A moving hole (10) is provided in the moving seat (5) that passes through the upper and lower sides. Multiple guide wheels (11) are provided on the wall of the moving hole (10). Multiple guide grooves (12) are arranged vertically around the upper edge of the support frame. The multiple guide wheels (11) are respectively rolled in the multiple guide grooves (12). A first servo motor (13) is provided in the moving seat (5). A first gear (14) is installed on the output shaft of the first servo motor (13). The first gear (14) meshes with the rack (9).

3. The partial discharge detection device according to claim 2, characterized in that: The lower side of the rotating disk (6) is rotatably connected to the upper side of the moving seat (5) via a plane bearing (15). The upper ring of the plane bearing (15) is connected to the lower side of the rotating disk (6), and the lower ring of the plane bearing (15) is connected to the upper side of the moving seat (5). An external gear ring (16) is provided on the outer wall of the upper ring of the plane bearing (15). A second servo motor is installed on the outer side of the moving seat (5). A second gear (18) is installed on the output shaft of the second servo motor. The second gear (18) meshes with the external gear ring (16).

4. The partial discharge detection device according to claim 3, characterized in that: The upper side of the detection body (3) is provided with a winding part (19), and a winding cavity (20) is provided inside the winding part (19). A winding shaft (21) is horizontally arranged near the top of the winding cavity (20). The winding shaft (21) is driven by a third servo motor. An outlet (22) communicating with the winding cavity (20) is provided on the upper side of the winding part (19). A first rod (23) is vertically installed on the top of the winding cavity (20). A detection hole (24) is provided at the lower end of the first rod (23). A second rod (25) is slidably arranged up and down inside the detection hole (24). A pressure is provided at the bottom of the detection hole (24). Force sensor (26), the upper end of the second rod (25) abuts against the pressure sensor (26) through the first spring (27), the lower end of the second rod (25) is connected to a pulley (28) below the first rod (23), the first communication line (29) is wound on the winding shaft (21), one end of the first communication line (29) is electrically connected to the detection body (3), the other end passes around the lower side of the pulley (28) and passes out from the outlet (22), and is fixed to the side of the moving seat (5) by the fixing block (30), the detection end (8) is electrically connected to the first communication line (29) through the second communication line (31).

5. A partial discharge detection device according to claim 4, characterized in that: The adjustable support foot includes a second electric telescopic rod (32), a first support foot (33), and a second support foot (34). The support chassis (2) is provided with an installation cavity. The fixed end of the second electric telescopic rod (32) is installed in the installation cavity. The telescopic end of the second electric telescopic rod (32) passes through the installation cavity and is connected to the upper end of the first support foot (33). The lower end of the first support foot (33) is provided with an adjustment hole (35). The second support foot (34) is slidably installed in the adjustment hole (35). The upper end of the second support foot (34) is connected to the bottom of the adjustment hole (35) through a second spring (36). The lower end of the second support foot (34) is connected to a roller (37) below the first support foot (33).

6. The partial discharge detection device according to claim 1, characterized in that: The front side of the detection body (3) is provided with a first camera (38), and the upper side of the first electric telescopic rod (7) is provided with a second camera (39).

7. A method for detecting partial discharge, characterized in that, The partial discharge detection device as described in claim 5 is used for detection, including the following steps: Step S1, control the movable base (1) to move to the area to be detected; Step S2, control the extension and retraction of the second electric telescopic rod (32) according to the target detection height, drive the first support leg (33) and the second support leg (34) to unfold outward, so that the roller (37) contacts the ground and compresses the second spring (36), thereby expanding the support area of ​​the support chassis (2); Step S3, start the first servo motor (13), drive the movable seat (5) to move up and down along the guide rail frame (4) through the meshing transmission of the first gear (14) and the rack (9), and at the same time, the guide wheel (11) rolls and guides in the guide groove (12) to adjust the detection end (8) to the target height; Step S4, during the lifting and lowering process of the movable seat (5), the third servo motor drives the winding shaft. (21) Rotate synchronously to release or rewind the first communication line (29); at the same time, monitor the pressure value of the first spring (27) in real time through the pressure sensor (26) and adjust the speed of the third servo motor to keep the first communication line (29) taut; in step S5, control the extension and retraction of the first electric telescopic rod (7) to drive the detection end (8) to move horizontally to the target detection position and bring the detection end (8) close to the device under test; in step S6, start the second servo motor and drive the rotating disk (6) to rotate horizontally around the guide rail frame (4) through the meshing transmission of the second gear (18) and the external gear ring (16), so as to drive the first electric telescopic rod (7) and the detection end (8) to perform circumferential scanning detection; in step S7, collect the partial discharge signal through the detection end (8) and transmit it to the detection body (3) through the second communication line (31) and the first communication line (29).

8. The partial discharge detection method according to claim 7, characterized in that: In step S4, when the moving seat (5) rises, if the pressure value detected by the pressure sensor (26) increases and exceeds the preset threshold, the speed of the third servo motor is increased to speed up the wire feeding speed; if the pressure value decreases, the speed of the third servo motor is reduced to slow down the wire feeding speed to prevent the first communication line (29) from breaking or loosening.

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