A high-voltage cable partial discharge detection device

Abstract

This invention discloses a partial discharge detection device for high-voltage cables, relating to the field of discharge detection technology. The device includes a lower housing with a main drive motor installed inside. Two clamping wheels are symmetrically mounted on the main drive motor. A lower detection half-ring is installed inside the lower housing. An upper housing is hinged to the lower housing, and an upper detection half-ring and a processing terminal are mounted on the upper housing. The upper and lower housings together form a rectangular detection housing. The cable passes through openings at both ends. Starting the main drive motor drives the clamping wheels to rotate. Both clamping wheels move the entire detection device along the cable through friction with the cable. The upper and lower detection half-rings detect pulse signals on both sides of the cable to determine whether there is partial discharge or damage. This device allows for continuous detection of high-altitude cables, accurately pinpointing the discharge location, improving detection efficiency, and reducing worker workload and safety risks.

Description

Technical Field

[0001] This invention relates to the field of discharge detection technology, specifically a partial discharge detection device for high-voltage cables. Background Technology

[0002] High-voltage cable discharge detection is an important means of ensuring the safe operation of power systems. With the acceleration of urbanization and the expansion of renewable energy grid connection, the application of high-voltage cables is becoming increasingly widespread. However, during long-term operation, partial discharge may occur 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. If it is not detected in time, it will gradually erode the insulation material, eventually leading to cable breakdown or short circuit, causing large-scale power outages or even safety accidents. Traditional manual inspections are difficult to detect hidden discharges, while modern detection technologies (such as high-frequency current sensors, ultrasonic detection, and ultra-high frequency methods) can detect discharge signals in real time.

[0003] Under current technology, non-contact testing is used when inspecting cables installed at high altitudes. This testing method has a wide range and is fast, but it can detect a large area of ​​partial discharge and can only determine the approximate location, which is not precise enough. Workers need to conduct local testing again during subsequent repairs. When workers perform precise positioning manually, the testing efficiency is low and the work risk factor for workers is high. Summary of the Invention

[0004] The purpose of this invention is to provide a partial discharge detection device for high-voltage cables to solve the problems mentioned in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The high-voltage cable partial discharge detection device includes a lower housing, in which a main drive motor is installed. A motor gear is installed on the output shaft of the main drive motor. A drive gear is rotatably installed in the lower housing. A bevel gear is coaxially installed on the drive gear and meshes with the motor gear. Two transmission gears are symmetrically installed in the lower housing, and both transmission gears mesh with the drive gear. A transmission rod is installed on the transmission gear. An active fork is installed at the upper end of the transmission rod. An active fork rod is rotatably installed on the active fork. A driven fork is installed on the active fork rod. A rotating rod is installed on the driven fork. A clamping wheel is installed on the rotating rod. A lower detection half-ring is installed in the lower housing. An upper housing is hinged to the lower housing. An upper detection half-ring and a processing terminal are installed on the upper housing.

[0006] As a preferred technical solution, two mounting blocks are symmetrically installed inside the lower housing. Each mounting block is equipped with an electric telescopic rod, and the ends of the two electric telescopic rods are respectively connected to the ends of the two rotating rods on the side away from the driven fork.

[0007] As a preferred technical solution, the upper housing is equipped with a buckle for fixing the connection between the upper housing and the lower housing, and the upper detection half ring and the lower detection half ring are spliced ​​together to form a circular detection ring.

[0008] As a preferred technical solution, both ends of the upper and lower housings are provided with openings, the diameter of the openings at both ends of the upper and lower housings is larger than the diameter of the cable to be tested, and several ball bearings are installed at the openings at both ends of the upper and lower housings.

[0009] As a preferred technical solution, the lower housing and the upper housing are provided with a marking component and a cleaning component. The marking component can display the detection results, and the cleaning component is beneficial to the operation of the discharge detection and the marking component.

[0010] As a preferred technical solution, the marking assembly includes a mounting half-ring, an arc plate, a hopper, a nozzle, a first auxiliary motor, a second auxiliary motor, a first external gear, and a second external gear;

[0011] Both the upper and lower housings have mounting semi-rings installed on their outer walls away from the main drive motor. An arc plate with an arc angle greater than 180 degrees is detachably mounted on each mounting semi-ring. A hopper is mounted on the arc plate, and a nozzle is mounted on the hopper. A first auxiliary motor is mounted on the lower housing, and a first external gear is mounted on the output shaft of the first auxiliary motor. A second auxiliary motor is mounted on the upper housing, and a second external gear is mounted on the output shaft of the second auxiliary motor. The first and second external gears are located in the same vertical plane and are symmetrical about the center of the opening. Both the first and second external gears mesh with the arc plate gear. The first auxiliary motor, the second auxiliary motor, and the nozzles are all electrically connected to the processing terminal.

[0012] As a preferred technical solution, the marking component further includes a mounting groove, an elastic baffle, and a retaining bead;

[0013] The mounting half-ring has a mounting groove, and an elastic baffle is installed at the opening of the mounting groove. Several retaining beads are evenly distributed on the side of the arc plate near the mounting half-ring.

[0014] As a preferred technical solution, the cleaning assembly includes an upper sleeve, a lower sleeve, a turntable gear, an eccentric rod, a slider, a first connecting rod, a lower reciprocating plate, a first cleaning brush, an insertion plate, a second connecting rod, an upper reciprocating plate, a second cleaning brush, a synchronous insertion plate, and a telescopic connecting rod.

[0015] A lower sleeve is installed on the outer wall of the lower housing near the main drive motor. Two turntable gears are symmetrically installed inside the lower housing, and the two turntable gears mesh with two transmission gears respectively. An eccentric rod is eccentrically installed on the turntable gear, and a slider is slidably installed at the end of the eccentric rod. The slider is connected to the lower housing through a telescopic connecting rod. A first connecting rod is installed on the side of the slider near the lower sleeve. The two first connecting rods are connected through a lower reciprocating plate. A first cleaning brush is installed on the lower reciprocating plate. An upper sleeve is installed on the upper housing. The upper sleeve and the lower sleeve are located on the same vertical plane. A socket plate is installed on the side of the slider away from the main drive motor. An upper reciprocating plate is slidably installed on the upper sleeve. A second cleaning brush is installed on the upper reciprocating plate. Two second connecting rods are symmetrically installed on the side of the upper reciprocating plate near the upper housing. A synchronous insert plate is installed at the end of the second connecting rod.

[0016] As a preferred technical solution, a cable is placed between the upper and lower housings, and the openings of the upper and lower housings, the upper detection half-ring, the lower detection half-ring, the mounting half-ring, the upper sleeve, and the lower sleeve are all coaxial with the cable.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By moving the detection device along the cable while conducting the inspection, continuous inspection of high-altitude cables can be carried out. This can accurately determine the discharge location, improve inspection efficiency, and reduce the workload and risk factor for workers.

[0019] 2. Set up a marking component, and spray insulating marking material onto the location where partial discharge or damage occurs through the nozzle to make accurate marks, which facilitates subsequent repair and also provides a certain degree of protection temporarily.

[0020] 3. Set up a cleaning component to clean the surface of the cable to prevent impurities from affecting the partial discharge test results and the uniformity of the insulation marking material spraying. Attached Figure Description

[0021] Figure 1 This is a first-view structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the second perspective structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 4 For the present invention Figure 1 Enlarged structural diagram at point A;

[0025] Figure 5 For the present invention Figure 2Enlarged structural diagram at point B;

[0026] Figure 6 For the present invention Figure 3 Enlarged structural diagram at point C;

[0027] Figure 7 For the present invention Figure 3 Enlarged structural diagram at point D;

[0028] Figure 8 This is a schematic diagram of the structure of the present invention after sealing;

[0029] Figure 9 This is a schematic diagram of the second-view structure after the cap is applied according to the present invention.

[0030] In the diagram: 1. Lower housing; 2. Main drive motor; 3. Motor gear; 4. Bevel gear; 5. Drive gear; 6. Transmission gear; 7. Transmission rod; 8. Driving fork; 9. Driving fork rod; 10. Driven fork; 11. Rotating rod; 12. Clamping wheel; 13. Mounting block; 14. Electric telescopic rod; 15. Upper housing; 16. Lower detection half-ring; 17. Upper detection half-ring; 18. Processing terminal; 19. Buckle;

[0031] 20. Marking component; 2001. Mounting half-ring; 2002. Mounting groove; 2003. Elastic baffle; 2004. Arc plate; 2005. Hopper; 2006. Nozzle; 2007. Clamping ball; 2008. First auxiliary motor; 2009. Second auxiliary motor; 2010. First external gear; 2011. Second external gear

[0032] 21. Cleaning assembly; 2101. Upper sleeve; 2102. Lower sleeve; 2103. Turntable gear; 2104. Eccentric rod; 2105. Slider; 2106. First connecting rod; 2107. Lower reciprocating plate; 2108. First cleaning brush; 2109. Insertion plate; 2110. Second connecting rod; 2111. Upper reciprocating plate; 2112. Second cleaning brush; 2113. Synchronous insertion plate; 2114. Telescopic connecting rod;

[0033] 22. Ball bearings; 23. Cable. Detailed Implementation

[0034] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example: Figures 1-4As shown, the present invention provides a technical solution for a high-voltage cable partial discharge detection device, characterized in that: the high-voltage cable partial discharge detection device includes a lower housing 1, a main drive motor 2 is installed inside the lower housing 1, a motor gear 3 is installed on the output shaft of the main drive motor 2, a drive gear 5 is rotatably installed inside the lower housing 1, a bevel gear 4 is coaxially installed on the drive gear 5, the bevel gear 4 meshes with the motor gear 3, and two transmission gears 6 are symmetrically installed inside the lower housing 1, both of which mesh with the drive gear 5. A transmission rod 7 is mounted on the transmission gear 6. An active fork 8 is mounted on the upper end of the transmission rod 7. An active fork rod 9 is rotatably mounted on the active fork 8. A driven fork 10 is mounted on the active fork rod 9. A rotating rod 11 is mounted on the driven fork 10. A clamping wheel 12 is mounted on the rotating rod 11. A lower detection half-ring 16 is installed inside the lower housing 1. An upper housing 15 is hinged to the lower housing 1. An upper detection half-ring 17 and a processing terminal 18 are mounted on the upper housing 15. Both the upper detection half-ring 17 and the lower detection half-ring 16 are electrically connected to the processing terminal 18.

[0036] During testing, the upper housing 15 and the lower housing 1 are combined to form a rectangular testing housing. The cable passes through the openings at both ends. The main drive motor 2 is started, and the output shaft of the main drive motor 2 drives the motor gear 3 to rotate synchronously. The motor gear 3 drives the bevel gear 4 to rotate through gear meshing. The bevel gear 4 drives the drive gear 5 to rotate synchronously. The drive gear 5 drives the transmission gear 6 to rotate synchronously through gear meshing. The transmission gear 6 drives the rotating rod 11 to rotate through the universal joint structure formed by the active fork 8, the active fork rod 9, and the driven fork 10. When the rotating rod 11 rotates, it drives the clamping wheel 12 to rotate synchronously. Both clamping wheels 12 drive the entire testing device to move along the cable through friction with the cable. When the testing device moves along the cable, the upper detection half ring 17 and the lower detection half ring 16 simultaneously detect the pulse signals on both sides of the cable to determine whether the cable has partial discharge and damage. By moving the testing device along the edge of the cable while testing, continuous testing of high-altitude cables can be performed. The discharge location can be accurately determined, improving testing efficiency while reducing the workload and risk factor for workers.

[0037] Two mounting blocks 13 are symmetrically installed inside the lower housing 1. Each mounting block 13 is equipped with an electric telescopic rod 14. The ends of the two electric telescopic rods 14 are respectively connected to the ends of the two rotating rods 11 on the side away from the driven fork 10.

[0038] Before testing, the electric telescopic rod 14 is in a retracted state to prevent the clamping wheel 12 from squeezing the cable, which would affect installation and testing. After the upper housing 15 and the lower housing 1 are closed, when the main drive motor 2 is running, the electric telescopic rod 14 extends and drives the clamping wheel 12 to get close to the cable, ensuring that the device can move along the cable for continuous testing and ensuring testing efficiency.

[0039] The upper housing 15 is equipped with a buckle 19 for fixing the connection between the upper housing 15 and the lower housing 1. The upper detection half ring 17 and the lower detection half ring 16 are spliced ​​together to form a circular detection ring.

[0040] The detection device is formed by the hinge of the upper housing 15 and the lower housing 1. It does not need to be inserted from the cable port during detection, which facilitates the installation of the detection device on the cable. The buckle 19 prevents the housing from cracking during the detection process.

[0041] Both ends of the upper housing 15 and the lower housing 1 are provided with openings. The diameter of the openings at both ends of the upper housing 15 and the lower housing 1 is larger than the diameter of the cable to be tested. Several ball bearings 22 are installed at the openings at both ends of the upper housing 15 and the lower housing 1.

[0042] The ball bearing 22 can effectively reduce the friction between the end of the detection device and the cable, which is beneficial to the movement of the detection device, while reducing friction on the cable and preventing damage to the cable.

[0043] The lower housing 1 and the upper housing 15 are equipped with a marking component 20 and a cleaning component 21. The marking component 20 can display the detection results, and the cleaning component 21 is beneficial for discharge detection and the operation of the marking component 20.

[0044] like Figures 1-3 and Figures 7-9 As shown, the marking assembly 20 includes a mounting half-ring 2001, an arc plate 2004, a hopper 2005, a nozzle 2006, a first auxiliary motor 2008, a second auxiliary motor 2009, a first external gear 2010, and a second external gear 2011;

[0045] On the outer wall of both the upper housing 15 and the lower housing 1, away from the main drive motor 2, there are mounting semi-rings 2001. An arc plate 2004 is detachably mounted on the mounting semi-ring 2001. The arc plate 2004 has an arc greater than 180 degrees. A hopper 2005 is mounted on the arc plate 2004, and a nozzle 2006 is mounted on the hopper 2005. A first auxiliary motor 2008 is mounted on the lower housing 1. A first external gear 2010 is mounted on the output shaft of the first auxiliary motor 2008. A second external gear 2010 is mounted on the upper housing 15. The second auxiliary motor 2009 has a second external gear 2011 mounted on its output shaft. The first external gear 2010 and the second external gear 2011 are located in the same vertical plane and are symmetrical about the center of the opening. Both the first external gear 2010 and the second external gear 2011 mesh with the gear of the arc plate 2004. The first auxiliary motor 2008, the second auxiliary motor 2009, and the nozzle 2006 are all electrically connected to the processing terminal 18.

[0046] The upper detection half-ring 17 and the lower detection half-ring 16 transmit the detection results back to the processing terminal 18. When partial discharge or damage is detected, the processing terminal 18 controls the main drive motor 2 to stop after a delay, so that the nozzle 2006 is on the same horizontal plane as the partial discharge or damage location. Then, the processing terminal 18 controls the first auxiliary motor 2008, the second auxiliary motor 2009, and the nozzle 2006 to operate. The first auxiliary motor 2008 drives the first external gear 2010, and the second auxiliary motor 2009 drives the second external gear 2011. The first external gear 2010 and the second external gear 2011 drive the arc plate 2004 to rotate along the cable through gear meshing. The nozzle 2006 sprays insulating marking material around the partial discharge or damage location to make precise markings, which facilitates subsequent repair and also temporarily provides a certain degree of protection.

[0047] The marking assembly 20 also includes a mounting slot 2002, a flexible baffle 2003, and a retaining bead 2007;

[0048] The mounting half-ring 2001 has a mounting groove 2002, and an elastic baffle 2003 is installed at the opening of the mounting groove 2002. Several locking beads 2007 are evenly distributed on the side of the arc plate 2004 near the mounting half-ring 2001.

[0049] When using the testing device, first combine the upper housing 15 and the lower housing 1, then press the arc plate 2004 into the mounting groove 2002. The outer side of the arc plate 2004 needs to mesh with the first external gear 2010 and the second external gear 2011. This detachable installation method facilitates the combination of the upper housing 15 and the lower housing 1 without affecting the rotation of the arc plate 2004. Furthermore, the arc of the arc plate 2004 is greater than 180 degrees, ensuring that at least one of the first external gear 2010 and the second external gear 2011 can drive the arc plate.

[0050] like Figures 1-6 As shown, the cleaning assembly 21 includes an upper sleeve 2101, a lower sleeve 2102, a turntable gear 2103, an eccentric rod 2104, a slider 2105, a first connecting rod 2106, a lower reciprocating plate 2107, a first cleaning brush 2108, an insertion plate 2109, a second connecting rod 2110, an upper reciprocating plate 2111, a second cleaning brush 2112, a synchronous insertion plate 2113, and a telescopic connecting rod 2114.

[0051] A lower sleeve 2102 is installed on the outer wall of the lower housing 1 near the main drive motor 2. Two turntable gears 2103 are symmetrically installed inside the lower housing 1. The two turntable gears 2103 mesh with two transmission gears 6 respectively. An eccentric rod 2104 is eccentrically installed on the turntable gear 2103. A slider 2105 is slidably installed at the end of the eccentric rod 2104. The slider 2105 is connected to the lower housing 1 through a telescopic connecting rod 2114. A first connecting rod 2106 is installed on the side of the slider 2105 near the lower sleeve 2102. The two first connecting rods 2106 are connected by a lower reciprocating plate 210. The system is connected in seven phases. A first cleaning brush is installed on the lower reciprocating plate 2107. An upper sleeve 2101 is installed on the upper housing 15. The upper sleeve 2101 and the lower sleeve 2102 are located on the same vertical plane. A socket plate 2109 is installed on the side of the slider 2105 away from the main drive motor 2. An upper reciprocating plate 2111 is slidably installed on the upper sleeve 2101. A second cleaning brush 2112 is installed on the upper reciprocating plate 2111. Two second connecting rods 2110 are symmetrically installed on the side of the upper reciprocating plate 2111 near the upper housing 15. A synchronous insert plate 2113 is installed at the end of the second connecting rod 2110.

[0052] When the main drive motor 2 operates, it drives the transmission gear 6 to rotate. The transmission gear 6 drives the turntable gear 2103 to rotate through gear meshing. Since the eccentric rod 2104 is eccentrically mounted on the turntable gear 2103, and the slider 2105 is connected to the lower housing 1 through the telescopic connecting rod 2114, the eccentric rod 2104 is slidably mounted inside the slider 2105. Therefore, the eccentric rod 2104 slides back and forth perpendicularly to the first connecting rod 2106 inside the slider 2105. At the same time, the eccentric rod 2104 drives the slider 2105 to move back and forth parallel to the first connecting rod 2106. When the slider 2105 moves back and forth parallel to the first connecting rod 2106... The first cleaning brush 2108 moves synchronously via the first connecting rod 2106 and the lower reciprocating plate 2107, cleaning the cable surface. When the upper housing 15 and the lower housing 1 are closed, the synchronous insert plate 2113 is inserted into the insert plate 2109. The reciprocating movement of the slider 2105 drives the second cleaning brush 2112 to move synchronously via the second connecting rod 2110 and the upper reciprocating plate 2111. The first cleaning brush 2108 and the second cleaning brush 2112 form a complete ring of cleaning brushes to clean the cable, while preventing impurities from affecting the detection ring's detection of the cable and ensuring the uniform spraying of the insulation marking material.

[0053] The cable 23 is placed between the upper box 15 and the lower box 1. The openings of the upper box 15 and the lower box 1, the upper detection half ring 17, the lower detection half ring 16, the mounting half ring 2001, the upper sleeve 2101 and the lower sleeve 2102 are all coaxial with the cable 23.

[0054] Coaxial installation ensures that the cable 23 is centered in the device, reducing wear caused by friction while maintaining the effectiveness of cleaning, inspection, and marking.

[0055] Working principle of the invention:

[0056] When in use, the lower housing 1 and the upper housing 15 are put together, the cable 23 is wrapped inside the device, and the arc plate 2004 is pressed into the installation half ring.

[0057] In sequence, the main drive motor 2 drives the first cleaning brush 2108 and the second cleaning brush 2112 through the first part of the transmission component to clean the surface of the cable 23, so as to prevent impurities from affecting the partial discharge detection results.

[0058] Behind the cleaning component 21, the main drive motor 2 drives two clamping wheels 12 to rotate through the second part of the transmission components such as gears and universal joints. The friction force drives the entire device to move along the cable. At the same time, the upper detection half ring 17 and the lower detection half ring 16 perform a ring-shaped detection on the cable. By moving along the cable and detecting at the same time, the detection device can continuously detect high-altitude cables, accurately determine the discharge location, improve detection efficiency, and reduce the labor intensity and risk factor of workers.

[0059] The upper detection half-ring 17 and the lower detection half-ring 16 will transmit the detection results to the processing terminal. When partial discharge or damage is detected, the processing terminal 18 will control the main drive motor 2 to stop after a delay, and the device will stop moving. The insulating marking material will be sprayed onto the location where partial discharge or damage occurs through the nozzle 2006 to make accurate markings, which will facilitate subsequent repair and provide temporary protection.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A partial discharge detection apparatus for a high voltage cable, characterized by: The high-voltage cable partial discharge detection device includes a lower housing (1), in which a main drive motor (2) is installed. A motor gear (3) is installed on the output shaft of the main drive motor (2). A drive gear (5) is rotatably installed in the lower housing (1). A bevel gear (4) is coaxially installed on the drive gear (5). The bevel gear (4) meshes with the motor gear (3). Two transmission gears (6) are symmetrically installed in the lower housing (1). Both transmission gears (6) mesh with the drive gear (5). A transmission rod (7) is installed on the upper end of the transmission rod (7), an active fork (8) is installed on the upper end of the transmission rod (7), an active fork rod (9) is rotatably installed on the active fork (8), a driven fork (10) is installed on the active fork rod (9), a rotating rod (11) is installed on the driven fork (10), a clamping wheel (12) is installed on the rotating rod (11), a lower detection half ring (16) is installed inside the lower housing (1), an upper housing (15) is hinged to the lower housing (1), and an upper detection half ring (17) and a processing terminal (18) are installed on the upper housing (15). The lower housing (1) and the upper housing (15) are provided with a marking component (20) and a cleaning component (21). The marking component (20) can display the detection results, and the cleaning component (21) is beneficial to the operation of discharge detection and the marking component (20). The cleaning assembly (21) includes an upper sleeve (2101), a lower sleeve (2102), a turntable gear (2103), an eccentric rod (2104), a slider (2105), a first connecting rod (2106), a lower reciprocating plate (2107), a first cleaning brush (2108), an insertion plate (2109), a second connecting rod (2110), an upper reciprocating plate (2111), a second cleaning brush (2112), a synchronous insertion plate (2113), and a telescopic connecting rod (2114). A lower sleeve (2102) is installed on the outer wall of the lower housing (1) near the main drive motor (2). Two turntable gears (2103) are symmetrically installed inside the lower housing (1). The two turntable gears (2103) mesh with two transmission gears (6) respectively. An eccentric rod (2104) is eccentrically installed on the turntable gear (2103). A slider (2105) is slidably installed at the end of the eccentric rod (2104). The slider (2105) is connected to the lower housing (1) through a telescopic connecting rod (2114). A first connecting rod (2106) is installed on the side of the slider (2105) near the lower sleeve (2102). The two first connecting rods (2106) are connected by a lower reciprocating plate (2114). 07) Connected, the lower reciprocating plate (2107) is equipped with a first cleaning brush, the upper housing (15) is equipped with an upper sleeve (2101), the upper sleeve (2101) and the lower sleeve (2102) are located on the same vertical plane, the slider (2105) is equipped with a socket plate (2109) on the side away from the main drive motor (2), the upper reciprocating plate (2111) is slidably installed on the upper sleeve (2101), the upper reciprocating plate (2112) is equipped with a second cleaning brush (2112), the upper reciprocating plate (2111) is symmetrically equipped with two second connecting rods (2110) on the side of the upper reciprocating plate (2111) close to the upper housing (15), and the end of the second connecting rod (2110) is equipped with a synchronous plug plate (2113).

2. A partial discharge detection device for a high voltage cable according to claim 1, characterized in that Two mounting blocks (13) are symmetrically installed inside the lower housing (1). Each of the two mounting blocks (13) is equipped with an electric telescopic rod (14). The ends of the two electric telescopic rods (14) are respectively connected to the ends of the two rotating rods (11) on the side away from the driven fork (10).

3. The high-voltage cable partial discharge detection device according to claim 2, characterized in that: The upper housing (15) is equipped with a buckle (19), which is used to fix the connection between the upper housing (15) and the lower housing (1). The upper detection half ring (17) and the lower detection half ring (16) are spliced ​​together to form a circular detection ring.

4. The high-voltage cable partial discharge detection device according to claim 3, characterized in that: Both ends of the upper housing (15) and the lower housing (1) are provided with openings. The diameter of the openings at both ends of the upper housing (15) and the lower housing (1) is larger than the diameter of the cable to be tested. Several ball bearings (22) are installed at the openings at both ends of the upper housing (15) and the lower housing (1).

5. A partial discharge detection device for high-voltage cables according to claim 4, characterized in that: The marking assembly (20) includes a mounting half-ring (2001), an arc plate (2004), a hopper (2005), a nozzle (2006), a first auxiliary motor (2008), a second auxiliary motor (2009), a first external gear (2010), and a second external gear (2011). Both the upper housing (15) and the lower housing (1) have mounting half-rings (2001) installed on their outer walls away from the main drive motor (2). An arc plate (2004) is detachably mounted on the mounting half-ring (2001). The arc plate (2004) has an arc greater than 180 degrees. A hopper (2005) is mounted on the arc plate (2004), and a nozzle (2006) is mounted on the hopper (2005). A first auxiliary motor (2008) is mounted on the lower housing (1), and a first external gear (2010) is mounted on the output shaft of the first auxiliary motor (2008). The upper housing (15)... A second auxiliary motor (2009) is installed on the upper part of the device. A second external gear (2011) is installed on the output shaft of the second auxiliary motor (2009). The first external gear (2010) and the second external gear (2011) are located in the same vertical plane and are symmetrical about the center of the opening. The first external gear (2010) and the second external gear (2011) are both meshed with the gear of the arc plate (2004). The first auxiliary motor (2008), the second auxiliary motor (2009) and the nozzle (2006) are all electrically connected to the processing terminal (18).

6. The high-voltage cable partial discharge detection device according to claim 5, characterized in that: The marking assembly (20) also includes a mounting slot (2002), an elastic baffle (2003), and a retaining bead (2007); The mounting half-ring (2001) has a mounting groove (2002), and an elastic baffle (2003) is installed at the opening of the mounting groove (2002). Several locking beads (2007) are evenly distributed on the side of the arc plate (2004) near the mounting half-ring (2001).

7. The high-voltage cable partial discharge detection device according to claim 6, characterized in that: The cable (23) is placed between the upper box (15) and the lower box (1). The openings of the upper box (15) and the lower box (1), the upper detection half ring (17), the lower detection half ring (16), the installation half ring (2001), the upper sleeve (2101) and the lower sleeve (2102) are all coaxial with the cable (23).

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