Probe device for cable partial discharge detection

Abstract

The invention relates to the technical field of cable discharge detection equipment, and discloses a probe device for cable partial discharge detection, which comprises a frame plate, and symmetrically arranged U-shaped seats are arranged at two ends in the frame plate; a guide wheel is arranged on the U-shaped seat; a connecting shaft is fixed to the center of the guide wheel, and the surfaces of the two ends of the connecting shaft are rotationally connected with a U-shaped base through bearings. According to the probe device for cable partial discharge detection, the annular base drives the multiple sets of electromagnetic wave detectors to rotate, detection blind areas between the adjacent electromagnetic wave detectors can be made up, the detection comprehensiveness and accuracy are improved, due to rotation of the electromagnetic wave detectors, compared with a fixed detection mode, the probability of missed detection is remarkably reduced, and the detection efficiency is improved. According to the device, the partial discharge signal can be effectively detected even under the condition that the cable discharge is weak, and in addition, the device does not need external power to drive the electromagnetic wave detector to rotate, so that the energy-saving effect and the use efficiency of the device are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable discharge detection equipment, and particularly to a probe device for cable partial discharge detection. Background Technique

[0002] With the rapid development of China's economy, the scale of the power system has been continuously expanding. As an important part of the power transmission and distribution system, the safe operation of cables is crucial for the stability of the entire power system. During the long-term operation of cables, due to the influence of various factors (such as material aging, mechanical damage, overvoltage, etc.), local discharge phenomena may occur. Local discharge is an early sign of cable insulation deterioration. If not discovered and processed in time, it will further develop into insulation breakdown, triggering power system accidents.

[0003] Therefore, performing local discharge detection on cables is an important measure to prevent cable failures and ensure the safe operation of the power system. Currently, common cable local discharge detection methods mainly include detection technologies based on principles such as electromagnetic waves, ultrasonic waves, and infrared thermal imaging. Among these detection technologies, the use of electromagnetic wave sensors for local discharge detection has been widely applied due to its advantages such as high sensitivity and strong anti-interference ability;

[0004] Currently, the probe device is provided with multiple groups of electromagnetic wave sensors arranged in an annular and equidistant manner to comprehensively detect the outer peripheral surface of the cable. During the detection process, the electromagnetic wave sensors can usually only detect electromagnetic wave signals in one direction. When the cable discharge is weak, this may result in the failure to detect the local discharge signals of some parts of the cable. The probe device needs to be rotated manually to make up for the places where the cable is not detected due to the spacing between adjacent electromagnetic wave sensors, which is cumbersome to operate and has low detection efficiency. Therefore, we propose a probe device for cable local discharge detection to solve the above existing problems. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a probe device for cable local discharge detection, which solves the problem of incomplete cable discharge detection.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A probe device for cable local discharge detection includes a frame plate, and both ends inside the frame plate are provided with symmetrically arranged U-shaped seats;

[0007] A guide wheel is arranged on the U-shaped seat;

[0008] A connecting shaft is fixed at the center of the guide wheel, and both ends of the connecting shaft are rotationally connected to the U-shaped seat through bearings;

[0009] A connection and clamping mechanism is installed on the frame plate, and the guide wheels symmetrically arranged on both sides of the frame plate can be driven to move away from or close to each other through the connection and clamping mechanism;

[0010] An arc-shaped limiting cover is fixedly installed inside the frame plate, and an annular seat is arranged on the limiting cover;

[0011] A notch is opened on one side of the annular seat;

[0012] Electromagnetic wave detectors are fixedly installed on the inner side wall of the annular seat in an annular and equidistant arrangement;

[0013] A connection and driving mechanism is provided between the connection shafts symmetrically arranged on one side of the frame plate and the annular seat.

[0014] Preferably, an arc-shaped groove adapted to the annular seat is opened on the limiting cover, and a plurality of groups of equidistantly arranged balls are arranged on both sides of the inner wall of the arc-shaped groove of the limiting cover. A rolling groove adapted to the balls is opened on the inner side wall of the limiting cover. The balls are installed in the corresponding rolling grooves and roll in the rolling grooves. Limiting rings are opened on both sides of the annular seat, and each group of balls on each side slides in the limiting rings opened on the corresponding annular seat.

[0015] Preferably, a rubber sleeve is fixedly wrapped on the outer surface of the guide wheel.

[0016] Preferably, the connection and clamping mechanism includes threaded cylinders arranged on both sides below the frame plate and first bevel gears fixed on the outer surfaces of the threaded cylinders. Threaded rods are threadedly connected to both ends of the threaded cylinders through threaded grooves opened. Side plates are fixed to the ends of the two threaded rods away from each other. Guide rods arranged symmetrically are fixed to one side of the corresponding U-shaped seats on the side of the two side plates close to each other. A handle is fixedly installed on one side of the frame plate.

[0017] Preferably, limiting holes adapted to the guide rods are opened on the frame plate, and the guide rods can slide in the limiting holes opened on the frame plate. Fixed blocks one arranged symmetrically are fixed at positions on the lower surface of the frame plate close to the threaded cylinders. The threaded cylinders rotate on the corresponding two fixed blocks one through bearings.

[0018] Preferably, a rotating rod is arranged below the frame plate, and second bevel gears are fixed to both ends of the rotating rod. The two second bevel gears are respectively meshed and connected with the two corresponding first bevel gears. Support plates arranged symmetrically are fixed to the lower surface of the frame plate. The rotating rod rotates on the two support plates through bearings.

[0019] Preferably, the thread directions of the threaded grooves of the threaded cylinders on both sides of the frame plate are designed in an opposite structure, and the thread directions of the threaded grooves at both ends of the same threaded cylinder are also opposite.

[0020] Preferably, the connection driving mechanism includes a fixing rod fixed to one end of a connection shaft symmetrically arranged on one side of the frame plate, and a sleeve rod sleeved on the fixing rod. A locking bolt is threadedly connected to the sleeve rod through a threaded hole opened thereon. A third bevel gear is fixed to the bottom end of the sleeve rod. A cross plate is rotatably arranged on the outer surface of the sleeve rod through a limit bearing. One side of the cross plate is provided with a telescopic sleeve plate, which is composed of an inner shell and an outer shell slidingly sleeved with each other. One side of the cross plate is fixed to the surface of the outer shell of the telescopic sleeve plate, and the top end of the inner shell of the telescopic sleeve plate is fixed to the surface of the U-shaped seat. A driving rod is rotatably arranged at the bottom of the outer shell of the telescopic sleeve plate through a bearing. One end of the driving rod is fixed with a rubber wheel, and the other end of the driving rod is fixed with a fourth bevel gear meshed with the third bevel gear. The outer shell of the telescopic sleeve plate is threadedly connected with an extrusion bolt, and the extrusion bolt can extrude the inner shell of the telescopic sleeve plate to realize the locking of the inner and outer shells. The fourth bevel gears respectively meshed with the two groups of third bevel gears are designed in a symmetrically opposite structure.

[0021] Preferably, the rubber wheel is located in the annular seat and abuts against the inner side wall of the annular seat.

[0022] Preferably, the fixing rod is designed in a square structure, and the inner groove of the sleeve rod is adapted to the fixing rod.

[0023] Beneficial effects

[0024] The present invention provides a probe device for cable partial discharge detection. Compared with the prior art, the following beneficial effects are achieved:

[0025] The probe device for cable partial discharge detection drives a plurality of electromagnetic wave detectors to rotate through the annular seat, which can make up for the detection blind area between adjacent electromagnetic wave detectors, improve the comprehensiveness and accuracy of detection. Due to the rotation of the electromagnetic wave detectors, compared with the fixed detection method, the missed detection probability is significantly reduced. Even when the cable discharge is weak, the partial discharge signal can be effectively detected. In addition, this device does not require external power to drive the rotation of the electromagnetic wave detectors, thereby further improving the energy-saving effect and use efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is the present invention Figure 1 is an enlarged schematic diagram of part A of the present invention;

[0028] Figure 3 is a top view of the overall structure of the present invention;

[0029] Figure 4 is a schematic diagram of the separated structure of the limit cover and the annular seat of the present invention;

[0030] Figure 5 This is the left view of the overall structure of the present invention;

[0031] Figure 6 This is the top view of the overall structure of the present invention.

[0032] In the figure: 101, frame plate; 102, U-shaped seat; 103, guide wheel; 104, connecting shaft; 105, limit cover; 106, ball; 107, annular seat; 108, electromagnetic wave detector; 109, limit ring; 110, notch; 2, connecting and clamping mechanism; 201, threaded cylinder; 202, threaded rod; 203, side plate; 204, guide rod; 205, first helical gear; 206, second helical gear; 207, support plate; 208, rotating rod; 209, grip; 3, connecting and driving mechanism; 301, fixed rod; 302, sleeve rod; 303, locking bolt; 304, telescopic sleeve plate; 305, third helical gear; 306, fourth helical gear; 307, cross plate; 308, driving rod; 309, rubber wheel. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1-6 shown:

[0035] A probe device for detecting partial discharge of a cable, comprising a frame plate 101, and symmetrically arranged U-shaped seats 102 are provided at both ends inside the frame plate 101;

[0036] A guide wheel 103 is provided on the U-shaped seat 102, and a rubber sleeve is fixedly wrapped on the outer surface of the guide wheel 103, and the rubber sleeve is used to increase the contact friction between the guide wheel 103 and the cable;

[0037] A connecting shaft 104 is fixed at the center of the guide wheel 103, and both ends of the connecting shaft 104 are rotatably connected to the U-shaped seat 102 through bearings;

[0038] A connecting and clamping mechanism 2 is installed on the frame plate 101. Through the connecting and clamping mechanism 2, the symmetric guide wheels 103 on both sides of the frame plate 101 can be driven to move away from or close to each other. The connecting and clamping mechanism 2 includes threaded cylinders 201 arranged on both sides below the frame plate 101 and first bevel gears 205 fixed on the outer surfaces of the threaded cylinders 201. Threaded rods 202 are threadedly connected to both ends of the threaded cylinders 201 through threaded grooves opened. Side plates 203 are fixed to the ends of the two groups of threaded rods 202 that are away from each other. Guide rods 204 arranged symmetrically are fixed to the sides of the two groups of side plates 203 that are close to each other. One end of the symmetrically arranged guide rods 204 is fixed to one side of the corresponding U-shaped seat 102. A handle 209 is fixedly installed on one side of the frame plate 101. Limit holes adapted to the guide rods 204 are opened on the frame plate 101. The guide rods 204 can slide in the limit holes opened on the frame plate 101. Fixed blocks one arranged symmetrically are fixed to the lower surface of the frame plate 101 near the threaded cylinders 201. The threaded cylinders 201 rotate on the corresponding two groups of fixed blocks one through bearings. A rotating rod 208 is arranged below the frame plate 101. Second bevel gears 206 are fixed to both ends of the rotating rod 208. The two groups of second bevel gears 206 are respectively meshed and connected with the two groups of corresponding first bevel gears 205. Support plates 207 arranged symmetrically are fixed to the lower surface of the frame plate 101. The rotating rod 208 rotates on the two groups of support plates 207 through bearings. The thread directions of the threaded grooves of the threaded cylinders 201 on both sides of the frame plate 101 are designed to be opposite structures. The thread directions of the threaded grooves at both ends of the same threaded cylinder 201 are also opposite;

[0039] An arc-shaped limiting cover 105 is fixedly installed inside the frame plate 101. An annular seat 107 is arranged on the limiting cover 105. An arc-shaped groove adapted to the annular seat 107 is opened on the limiting cover 105. And a plurality of groups of equally spaced rolling balls 106 are arranged on both sides of the inner wall of the arc-shaped groove of the limiting cover 105. Rolling grooves adapted to the rolling balls 106 are opened on the inner side wall of the limiting cover 105. The rolling balls 106 are installed in the corresponding rolling grooves and roll in the rolling grooves. Limiting rings 109 are opened on both sides of the annular seat 107. Each group of rolling balls 106 slides in the limiting rings 109 opened on the corresponding annular seat 107;

[0040] A notch 110 is opened on one side of the annular seat 107;

[0041] Electromagnetic wave detectors 108 arranged in an annular and equally spaced manner are fixedly installed on the inner side wall of the annular seat 107;

[0042] On one side of the frame plate 101, there is a connection driving mechanism 3 between the symmetrically arranged connecting shafts 104 and the annular seat 107. The connection driving mechanism 3 includes a fixed rod 301 fixed to one end of the symmetrically arranged connecting shafts 104 on one side of the frame plate 101, and a sleeve rod 302 sleeved on the fixed rod 301. A locking bolt 303 is threadedly connected to the sleeve rod 302 through a threaded hole opened on the sleeve rod 302. A third bevel gear 305 is fixed to the bottom end of the sleeve rod 302. A cross plate 307 is rotatably arranged on the outer surface of the sleeve rod 302 through a limit bearing. A telescopic sleeve plate 304 is arranged on one side of the cross plate 307. The telescopic sleeve plate 304 is composed of an inner and outer shell slidingly sleeved. One side of the cross plate 307 is fixed to the outer shell surface of the telescopic sleeve plate 304, and the top end of the inner shell of the telescopic sleeve plate 304 is fixed to the surface of the U-shaped seat 102. A driving rod 308 is rotatably arranged at the bottom of the outer shell of the telescopic sleeve plate 304. A rubber wheel 309 is fixed to one end of the driving rod 308, and a fourth bevel gear 306 meshed with the third bevel gear 305 is fixed to the other end of the driving rod 308. The outer shell of the telescopic sleeve plate 304 is threadedly connected to an extrusion bolt, and the extrusion bolt can extrude the inner shell of the telescopic sleeve plate 304 to lock the inner and outer shells. The fourth bevel gears 306 respectively meshed with the two groups of third bevel gears 305 are designed in a symmetrically opposite structure. The rubber wheel 309 is located in the annular seat 107 and abuts against the inner side wall of the annular seat 107. The fixed rod 301 is designed in a square structure, and the inner groove of the sleeve rod 302 is adapted to the fixed rod 301.

[0043] In this implementation: When the probe device for cable partial discharge detection is in use, it is convenient to carry by holding the handle 209. Subsequently, the cable is introduced into the annular seat 107 through the notch 110 and is located between the symmetrically arranged guide wheels 103 on both sides at the same time.

[0044] The clamping centers of the symmetrically arranged guide wheels 103 are concentrically arranged with the annular seat 107. By rotating the rotating rod 208, the two groups of second bevel gears 206 can be driven to rotate. The second bevel gears 206 are meshed with the first bevel gears 205, so as to drive the threaded cylinder 201 to rotate. The threaded grooves opened on the two groups of threaded cylinders 201 on both sides have opposite structural designs. Therefore, when the rotating rod 208 drives the two groups of threaded cylinders 201 to rotate, one side guide rod 204 of the side plate 203 slides in the limit hole opened on the frame plate 101 to limit the side plate 203.

[0045] As the two groups of threaded cylinders 201 rotate, the threaded rods 202 will move away from or close to each other; as the threaded rods 202 move, the side plate 203 also moves accordingly. The movement of the side plate 203 drives the guide rod 204 and the U-shaped seat 102 to move synchronously, and then drives the guide wheels 103 to move through the U-shaped seat 102, so that the symmetrically arranged guide wheels 103 on both sides move away from or close to each other, thereby realizing the clamping operation on the cable surface.

[0046] Then rotate the locking bolt 303 to relieve the extrusion on the fixed rod 301, so that the sleeve rod 302 can slide on the fixed rod 301, which can adjust the synchronous downward movement of the third helical gear 305, the fourth helical gear 306, the driving rod 308 and the rubber wheel 309. At the same time, the inner and outer shells of the telescopic sleeve plate 304 extend, so that the rubber wheel 309 is in close contact with the inner side wall of the annular seat 107. Subsequently, reverse-rotate the locking bolt 303 to squeeze the fixed rod 301 to lock the connection between the sleeve rod 302 and the fixed rod 301;

[0047] At the same time, screw the extrusion bolt (not shown in the figure) to lock the inner and outer shells of the telescopic sleeve plate 304;

[0048] Start multiple groups of electromagnetic wave detectors 108 to detect the discharge condition of the cable. At the same time, hold the grip 209, and the driving device moves on the cable. The guide wheel 103 holds the cable in a clamped state, and the generated squeezing friction force enables the guide wheel 103 to drive the connecting shaft 104 to rotate on the U-shaped seat 102. Through the rotation of the connecting shaft 104, the fixed rod 301 (designed in a square structure) rotates accordingly. With the cooperation of the locking bolt 303, the fixed rod 301 drives the sleeve rod 302 to rotate, and then drives the third helical gear 305 to rotate through the sleeve rod 302;

[0049] The third helical gear 305 is meshed and connected with the fourth helical gear 306, thereby driving the fourth helical gear 306 to rotate. The fourth helical gear 306 drives the rubber wheel 309 to rotate through the driving rod 308. Since the rubber wheel 309 keeps squeezing the inner side wall of the annular seat 107, the generated friction force enables the annular seat 107 to rotate on the limit cover 105. The setting of the balls 106 and the limit ring 109 makes the rotation of the annular seat 107 on the limit cover 105 smoother;

[0050] Therefore, the rotation of the annular seat 107 drives multiple groups of electromagnetic wave detectors 108 to rotate, enabling the electromagnetic wave detectors 108 to detect the outer peripheral surface of the cable more comprehensively;

[0051] This solution drives multiple groups of electromagnetic wave detectors 108 to rotate through the annular seat 107, which can make up for the detection blind areas between adjacent electromagnetic wave detectors 108, improve the comprehensiveness and accuracy of detection. Due to the rotation of the electromagnetic wave detectors 108, compared with the fixed detection method, the missed detection probability is significantly reduced. Even when the cable discharge is weak, the partial discharge signal can be effectively detected. In addition, this device does not require external power to drive the rotation of the electromagnetic wave detectors 108, thereby further improving the energy-saving effect and service efficiency of the device;

[0052] It should be noted that the notch 110 on the top of the annular seat 107 is for the cable to pass smoothly. When one set of rubber wheels 309 moves to the notch 110, the other set of rubber wheels 309 is staggered from the notch 110, which ensures that the annular seat 107 can continue to rotate.

[0053] Since the fourth bevel gears 306 respectively meshed with the two groups of third bevel gears 305 are designed in symmetrical and opposite structures, and the rotation directions of the guide wheel 103 are different, the symmetrical and opposite designs of the fourth bevel gears 306 respectively meshed with the third bevel gears 305 make the rotation directions of the two groups of fourth bevel gears 306 driven by the two groups of third bevel gears 305 the same, and this design ensures the coordination and stability of the entire device.

[0054] It should be noted that the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A probe device for cable partial discharge detection, comprising a frame plate (101), characterized in that: At both ends inside the frame plate (101), there are U-shaped seats (102) arranged symmetrically; A guide wheel (103) is arranged on the U-shaped seat (102); A connecting shaft (104) is fixed at the center of the guide wheel (103), and both ends of the connecting shaft (104) are rotatably connected to the U-shaped seat (102) through bearings; A connecting clamping mechanism (2) is installed on the frame plate (101), and through the connecting clamping mechanism (2), the guide wheels (103) symmetrically arranged on both sides of the frame plate (101) can be driven to move away from or close to each other; An arc-shaped limiting cover (105) is fixedly installed inside the frame plate (101), and an annular seat (107) is arranged on the limiting cover (105); A notch (110) is opened on one side of the annular seat (107); Electromagnetic wave detectors (108) are fixedly installed on the inner side wall of the annular seat (107) in an annular and equidistant arrangement; A connecting driving mechanism (3) is provided between the connecting shafts (104) symmetrically arranged on one side of the frame plate (101) and the annular seat (107).

2. The probe device for cable partial discharge detection according to claim 1, characterized in that: An arc-shaped groove adapted to the annular seat (107) is opened on the limiting cover (105), and multiple groups of equidistantly arranged balls (106) are arranged on both sides of the inner wall of the arc-shaped groove of the limiting cover (105). A rolling groove adapted to the balls (106) is opened on the inner side wall of the limiting cover (105). The balls (106) are installed in the corresponding rolling grooves and roll in the rolling grooves. Limiting rings (109) are opened on both sides of the annular seat (107), and each group of balls (106) slides in the limiting rings (109) opened on the corresponding annular seat (107).

3. The probe device for cable partial discharge detection according to claim 1, wherein: A rubber sleeve is fixedly wrapped on the outer surface of the guide wheel (103).

4. The probe device for partial discharge detection of cables according to claim 2, characterized in that: The connecting clamping mechanism (2) includes threaded cylinders (201) arranged on both sides below the frame plate (101) and first bevel gears (205) fixed on the outer surfaces of the threaded cylinders (201). Threaded rods (202) are threadedly connected to both ends of the threaded cylinders (201) through threaded grooves. One end of the two threaded rods (202) away from each other is fixed with a side plate (203). On one side of the two side plates (203) close to each other, symmetrically arranged guide rods (204) are fixed. One end of the symmetrically arranged guide rods (204) is fixed on one side of the corresponding U-shaped seat (102). A handle (209) is fixedly installed on one side of the frame plate (101).

5. The probe device for cable partial discharge detection according to claim 4, wherein: Limit holes adapted to the guide rods (204) are opened on the frame plate (101), and the guide rods (204) can slide in the limit holes opened on the frame plate (101). Fixed blocks one are symmetrically arranged on the lower surface of the frame plate (101) near the threaded cylinders (201), and the threaded cylinders (201) are rotatably installed on the corresponding two fixed blocks one through bearings.

6. The probe device for cable partial discharge detection according to claim 4, wherein: A rotating rod (208) is arranged below the frame plate (101). Second helical gears (206) are fixed at both ends of the rotating rod (208). The two groups of second helical gears (206) are respectively meshed and connected with two corresponding first helical gears (205). Symmetrically arranged support plates (207) are fixed on the lower surface of the frame plate (101). The rotating rod (208) rotates on the two support plates (207) through bearings.

7. The probe device for detecting partial discharge of cables according to claim 4, wherein: The thread directions of the thread grooves of the threaded cylinders (201) on both sides of the frame plate (101) are designed with opposite structures, and the thread directions of the thread grooves at both ends of the same threaded cylinder (201) are also opposite.

8. The probe device for cable partial discharge detection according to claim 1, characterized in that: The connection driving mechanism (3) includes a fixing rod (301) fixed at one end of a symmetric connection shaft (104) on one side of the frame plate (101) and a sleeve rod (302) sleeved on the fixing rod (301). A locking bolt (303) is threadedly connected to the sleeve rod (302) through a threaded hole opened on the sleeve rod (302). A third helical gear (305) is fixed at the bottom end of the sleeve rod (302). A horizontal plate (307) rotates on the outer surface of the sleeve rod (302) through a limit bearing. A telescopic sleeve plate (304) is arranged on one side of the horizontal plate (307). The telescopic sleeve plate (304) is composed of an inner and an outer shell slidingly sleeved. One side of the horizontal plate (307) is fixed on the outer shell surface of the telescopic sleeve plate (304), and the top end of the inner shell of the telescopic sleeve plate (304) is fixed on the surface of the U-shaped seat (102). A driving rod (308) rotates on the bottom of the outer shell of the telescopic sleeve plate (304) through a bearing. A rubber wheel (309) is fixed at one end of the driving rod (308), and a fourth helical gear (306) meshed with the third helical gear (305) is fixed at the other end of the driving rod (308). An extrusion bolt is threadedly connected to the outer shell of the telescopic sleeve plate (304) through a threaded hole opened on the outer shell of the telescopic sleeve plate (304), and the extrusion bolt can extrude the inner shell of the telescopic sleeve plate (304) to lock the inner and outer shells. The fourth helical gears (306) respectively meshed with the two groups of third helical gears (305) are designed with symmetrically opposite structures.

9. The probe device for cable partial discharge detection according to claim 8, wherein: The rubber wheel (309) is located in the annular seat (107) and abuts against the inner side wall of the annular seat (107).

10. The probe device for cable partial discharge detection according to claim 8, characterized in that: The fixing rod (301) is designed with a square structure, and the inner groove of the sleeve rod (302) is adapted to the fixing rod (301).

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