Grounding monitoring device of power line

Abstract

The embodiment of the invention relates to the technical field of high-voltage cables, in particular to a grounding monitoring device of an electric power circuit, which utilizes current in a branch to drive a peripheral magnetic field to change, so that current is generated in a winding coil, and the current is connected to a connecting piece and is finally grounded through a grounding box between the connecting piece and an insertion pin. The limiting block of the inserting pin and the inserting hole in the connecting piece are staggered and matched with the elastic force of the spring to apply the elastic force to the inserting pin, so that the limiting block is in close contact with the connecting piece, when the performance of the spring is reduced and the connection between the limiting block and the connecting piece is loose, the branch wires are disconnected, and some of the three groups of branch wires do not generate current, and the pneumatic assembly is started; and the rack is driven to move, so that the rack is meshed with the transmission gear to rotate, the insertion pin is driven to move, the lost performance of the spring is compensated, the connecting piece and the insertion pin are fastened again, the automatic repairing function is achieved, and the electric shock accident risk is reduced.

Description

TECHNICAL FIELD

[0001] One or more embodiments of the present specification relate to the technical field of high-voltage cable, and in particular to a grounding monitoring device of a power line. BACKGROUND

[0002] With the development of urbanization and industrialization, the demand for electricity has increased sharply. High-voltage cables are the key medium for efficient transmission of electric energy. However, high-voltage cables are affected by electricity, heat, mechanical stress and environmental factors for a long time, and the insulation is easy to age and damage, causing faults. Therefore, high-voltage cable grounding is the key to ensuring the safe and stable operation of the power system, which can provide a low-resistance path for fault current and prevent electric shock.

[0003] A high-voltage cable grounding system detection device is disclosed in Chinese Patent No. CN118169606A, which includes a junction box, a wiring board is arranged in the junction box, a line connection module is arranged on the wiring board, a wiring plug ring is arranged on the upper end of the wiring board, a cable detection ring is arranged on the upper end of the junction box through a support block, a low-voltage winding coil is sleeved on the cable detection ring, and a thermal sensitive air bag is sleeved on the cable detection ring at a symmetrical position of the low-voltage winding coil. The use of the thermal sensitive air bag in cooperation with the cable detection ring can improve the detection sensitivity of the detection ring to the grounding cable, so that the entire detection device can achieve more accurate detection.

[0004] However, the applicant finds that the prior art at least has the following problems: When large equipment is working near the grounding box, the spring at the grounding end of the cable will constantly stretch and contract, affecting the service life and further affecting the detection accuracy of the detection ring to the grounding cable. SUMMARY

[0005] Therefore, the purpose of one or more embodiments of the present specification is to provide a grounding monitoring device of a power line to solve the problem that the joint at the end of the grounding wire is easy to loosen in a vibrating environment, affecting the detection accuracy.

[0006] Based on the above objectives, one or more embodiments of this specification provide a power line grounding monitoring device, comprising: a grounding wire and a grounding box; three branch wires connected to the end of the grounding wire; grounding terminals fixedly connected to the branch wires; grounding terminals fixedly mounted on a mounting plate; the mounting plate fixedly mounted in the grounding box; a fixed port mounted on the mounting plate, the fixed port corresponding one-to-one with the grounding terminal; a connecting piece mounted on the fixed port; an insertion hole provided on the connecting piece; an insertion pin movably mounted on the mounting plate; a limiting block provided at the end of the insertion pin; the insertion pin being mounted through the mounting plate; a spring seat sleeved on the side of the insertion pin away from the connecting piece; a spring installed between the spring seat and the mounting plate; a gear threadedly connected to the end of the insertion pin away from the connecting piece; the gear being connected to a mounting shell; the mounting shell being fixedly mounted in the grounding box; the mounting shell having a notch for exposing a portion of the gear; a rack meshing with the exposed portion of the gear; a pneumatic assembly connected to the rack; and a guide assembly connected to the insertion pin; after being connected to the connecting piece, the guide insertion pin can only perform insertion and removal actions. Each of the three branch lines is fitted with a cable detection ring, and a winding coil is wound on the cable detection ring. The winding coil is connected to an ammeter to monitor the current in the three winding coils. If the number of winding coils that generate current at the same time is equal to three or equal to zero, it is determined that the connection of the three branch lines is intact. If the number of winding coils that generate current at the same time is less than three but greater than zero, it is determined that the connection of the three branch lines is partially loose. Then, the pneumatic component is controlled to work, driving the insertion pin to move and clamp the connecting piece.

[0007] Optionally, the pneumatic assembly includes a piston rod, with one end of the piston rod fixedly connected to a rack, and the other end of the piston rod adapted to be connected to a piston cylinder. A piston is connected to the end of the piston rod inserted into the piston cylinder. An air cylinder is integrally formed above the piston cylinder. The air cylinder has a deflection air passage, and a rotary valve is provided below the deflection air passage. A valve shaft is connected between the rotary valve and the inner wall of the air cylinder. A limit pin is provided at the bottom of the rotary valve. The limit pin is electrically connected to a winding coil. When there is current in the winding coil, the limit pin restricts the rotation of the rotary valve. The three air cylinders are connected to an air pipe, and the air pipe is connected to a miniature air pump.

[0008] Optionally, a barometer is installed in the piston cylinder to monitor the inflation pressure. When the pressure reaches the pressure threshold, the micro air pump stops pumping. A one-way valve is also installed in the piston cylinder to maintain the pressure in the piston cylinder after inflation.

[0009] Optionally, the winding coil is connected to an amplification circuit, and the winding coil is electrically connected to a limit pin. The limit pin includes a telescopic rod mounted on a connecting plate. The connecting plate is fixedly mounted on the mounting plate. The end of the telescopic rod is connected to an abutment part through a hinge shaft. The abutment part is restricted by the hinge shaft to be able to rotate 180° upward from a horizontal position, but cannot rotate downward from a horizontal position. The surface of the abutment part that abuts against the rotary valve is curved. An avoidance groove adapted to the abutment part is provided on the inner wall of the deflection air passage. A torsion spring is provided on the valve shaft to give the rotary valve a tendency to return to a horizontal position.

[0010] Optionally, the guide assembly includes a rotating seat fixedly mounted on the mounting plate, the rotating seat being rotatably connected to a rotating rod, the end of the rotating rod being connected to a guide rod, and the insertion pin having a guide hole adapted to the guide rod.

[0011] Optionally, the connecting piece includes two sets of long connecting pieces at the edge and one set of short connecting pieces in the middle. The two sets of long connecting pieces and the short connecting pieces are respectively connected to the fixed port through a rotating shaft. The long connecting piece is provided with two sets of insertion holes for cross-interconnection between the three branch lines. The insertion hole located at the bottom is adapted to the position of the insertion pin in the middle.

[0012] Optionally, the three sets of cable detection rings are equipped with electromagnetic shielding covers on their outer periphery.

[0013] Optionally, a signal generator is installed in the grounding box to monitor whether current is regenerated in the disconnected branch line after the pneumatic component has been activated; otherwise, the signal generator will issue an alarm signal.

[0014] Optionally, a rack mounting sleeve is adapted to be connected to the bottom of the rack, and the rack mounting sleeve is fixedly installed in the grounding box.

[0015] Optionally, the grounding terminal and the branch line are connected by a contact block. As can be seen from the above description, the grounding monitoring device for power lines provided in one or more embodiments of this specification utilizes the current in the branch line to drive changes in the surrounding magnetic field, causing current to be generated in the winding coil. The current is connected to the connecting piece and finally grounded through the grounding box. Between the connecting piece and the insertion pin, by misaligning the limiting block of the insertion pin with the insertion hole on the connecting piece, and with the elastic force of the spring, an elastic force is applied to the insertion pin, making the limiting block and the connecting piece in tight contact, ensuring smooth detection. When the spring works in a vibration environment for a long time, its performance deteriorates, causing the connection between the limiting block and the connecting piece to loosen. At this time, it will cause the branch line to break. The cable detection ring detects that some of the three branch lines do not generate current. At this time, the pneumatic component is activated to drive the rack to move, thereby causing the rack to mesh with the transmission gear to rotate. The gear is threadedly connected to the insertion pin, thereby driving the insertion pin to move under the action of the guiding component, compensating for the performance loss of the spring, and thus re-tightening the connecting piece and the insertion pin, realizing the function of automatic repair, reducing the impact on the current detection in the cable, and improving the detection accuracy of the cable operating status. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in one or more embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a grounding monitoring device for a power line, representing one or more embodiments of this specification. Figure 2 This specification provides a schematic diagram of the internal structure of a grounding monitoring device for a power line, representing one or more embodiments. Figure 1 ; Figure 3 This specification provides a schematic diagram of the internal structure of a grounding monitoring device for a power line, representing one or more embodiments. Figure 2 ; Figure 4 for Figure 3 A magnified schematic diagram of a portion of the structure in section A. Figure 5 This is a partial structural schematic diagram of a grounding monitoring device for a power line according to one or more embodiments of this specification; Figure 6 for Figure 5 Enlarged schematic diagram of a local structure in section B; Figure 7 This is a schematic diagram of the structure of a limit pin for a grounding monitoring device for a power line, as shown in one or more embodiments of this specification.

[0018] In the picture: 101. Grounding wire; 103. Branch wire; 104. Grounding terminal; 201. Grounding box; 202. Mounting plate; 301. Cable detection ring; 302. Winding coil; 303. Amplifier circuit; 304. Connecting plate; 305. Limit pin; 3051. Telescopic rod; 3052. Hinge shaft; 3053. Contact part; 401. Fixed port; 402. Rotating shaft; 403. Long connecting piece; 404. Short connecting piece; 405. Insertion hole; 501. Insertion 502. Pin; 503. Limiting block; 504. Spring seat; 505. Spring; 506. Guide hole; 507. Rotating rod; 508. Rotating seat; 509. Mounting shell; 510. Gear; 511. Rack; 512. Rack mounting sleeve; 601. Air pipe; 602. Piston rod; 603. Piston cylinder; 604. Piston; 605. Air cylinder; 606. Deflecting air passage; 607. Rotary valve; 608. Valve shaft; 6061. Clearance groove. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] It is understandable that this method can be executed by any device, equipment, platform, or cluster of devices with computing and processing capabilities.

[0022] This specification provides one or more embodiments of a power line grounding monitoring device, such as... Figures 1 to 7As shown, the device includes a grounding wire 101 and a grounding box 201. Three branch wires 103 are connected to the end of the grounding wire 101. Grounding terminals 104 are fixedly connected to the branch wires 103 and are fixedly mounted on a mounting plate 202. The mounting plate 202 is fixedly mounted in the grounding box 201. A fixing port 401 is mounted on the mounting plate 202, corresponding one-to-one with each grounding terminal 104. A connecting piece is mounted on the fixing port 401, and an insertion hole 405 is provided on the connecting piece. An insertion pin 501 is movably mounted on the mounting plate 202, and a limiting block 502 is provided at the end of the insertion pin 501. The insertion pin 501 is inserted through the mounting box 201. On plate 202, a spring seat 503 is fitted on the side of the insertion pin 501 away from the connecting piece. A spring 504 is installed between the spring seat 503 and the mounting plate 202. A gear 510 is also threaded to the end of the insertion pin 501 away from the connecting piece. The gear 510 is connected to a mounting shell 509. The mounting shell 509 is fixedly installed in the grounding box 201. The mounting shell 509 has a notch to expose a part of the gear 510. The exposed part of the gear 510 is meshed with a rack 511. The rack 511 is connected to a pneumatic component. The insertion pin 501 is connected to a guide component. After being connected to the connecting piece, the guide insertion pin 501 can only perform insertion and removal actions. The three branch lines 103 are respectively fitted with cable detection rings 301 around their perimeters. The cable detection rings 301 are wound with winding coils 302. The winding coils 302 are connected to ammeters to monitor the current in the three winding coils 302. If the number of winding coils 302 that generate current at the same time is equal to three or equal to zero, it is determined that the connection of the three branch lines 103 is intact. If the number of winding coils 302 that generate current at the same time is less than three but greater than zero, it is determined that the connection of the three branch lines 103 is partially loose. Then, the pneumatic component is controlled to work, driving the insertion pin 501 to move and clamp the connecting piece.

[0023] During the operation of high-voltage cables, when the line or equipment leaks current, releases three-phase unbalanced voltage, or is struck by lightning, current is generated in the grounding wire 101. At this time, the branch wire 103 connects the current to the ground. The current in the branch wire 103 will drive the change of the surrounding magnetic field, causing current to be generated in the winding coil 302. The current connects to the connecting piece and is finally grounded through the grounding box 201. Between the connecting piece and the insertion pin 501, by misaligning the limiting block 502 of the insertion pin 501 with the insertion hole 405 on the connecting piece, and with the elastic force of the spring 504, an elastic force is applied to the insertion pin 501, so that the limiting block 502 is in close contact with the connecting piece. When the spring 504 works in a vibration environment for a long time, its performance deteriorates, leading to... When the connection between the limit block 502 and the connecting piece becomes loose, it will cause the branch line 103 to be broken. The cable detection ring 301 detects that some of the three branch lines 103 are not generating current. At this time, the pneumatic component is activated to drive the rack 511 to move, so that the rack 511 meshes with the transmission gear 510 to rotate. The gear 510 is threadedly connected to the insertion pin 501. Under the action of the guide component, the insertion pin 501 is driven to move, which compensates for the performance loss of the spring 504. This re-tightens the connecting piece and the insertion pin 501, realizing the function of automatic repair, reducing the impact on the detection of cable operation, ensuring that the entire detection device is in an accurate and reliable operating state, and improving the accuracy of cable current detection.

[0024] In some optional specific embodiments, such as Figures 2 to 7 As shown, the pneumatic assembly includes a piston rod 602, with one end of the piston rod 602 fixedly connected to a rack 511. The other end of the piston rod 602 is adapted to be connected to a piston cylinder 603. The end of the piston rod 602 inserted into the piston cylinder 603 is connected to a piston 604. An air cylinder 605 is integrally formed above the piston cylinder 603. The air cylinder 605 has a deflection air passage 606. A rotary valve 607 is provided below the deflection air passage 606. A valve shaft 608 is connected between the rotary valve 607 and the inner wall of the air cylinder 605. A limiting pin 305 is provided at the bottom of the rotary valve 607. The limiting pin 305 is electrically connected to a winding coil 302. When there is current in the winding coil 302, the limiting pin 305 restricts the rotation of the rotary valve 607. The three air cylinders 605 are connected to an air pipe 601, and the air pipe 601 is connected to a miniature air pump. In use, when one of the branch lines 103 is broken, the micro air pump is filled with air. The rotary valve 607 corresponding to the branch line 103 that is not broken is restricted from rotating, while the rotary valve 607 corresponding to the branch line 103 that is broken rotates under the action of the gas in the biased air passage 606. The gas is filled into the piston cylinder 603 to drive the rack 511.

[0025] In some optional embodiments, a barometer is installed in the piston cylinder 603 to monitor the inflation pressure. When the pressure reaches a pressure threshold, the micro air pump stops pumping. A one-way valve is also installed in the piston cylinder 603 to maintain the pressure in the piston cylinder 603 after inflation. By setting the pressure threshold, the pressure on the connecting piece is ensured to be moderate.

[0026] In some optional specific embodiments, such as Figures 2 to 7 As shown, the winding coil 302 is connected to an amplifier circuit 303, and the winding coil 302 is electrically connected to a limit pin 305. The limit pin 305 includes a telescopic rod 3051 mounted on a connecting plate 304. The connecting plate 304 is fixedly mounted on a mounting plate 202. The end of the telescopic rod 3051 is connected to an abutment part 3053 via a hinge shaft 3052. The abutment part 3053 is restricted by the hinge shaft 3052 to be able to rotate 180° upward from a horizontal state, but cannot rotate downward from a horizontal state. The surface of the abutment part 3053 that abuts against the rotary valve 607 is a curved surface. An avoidance groove 6061 adapted to the abutment part 3053 is provided on the inner wall of the deflection air passage 606. A torsion spring is provided on the valve shaft 608, so that the rotary valve 607 has a tendency to return to a horizontal position. Once inflation is complete, the branch line 103 will resume its circuit and generate current. Under this action, the telescopic rod 3051 will extend and be energized. Then, under the action of the torsion spring, the rotary valve 607 will return to a horizontal state, and the contact part 3053 will be squeezed into the relief groove 6061. After the rotary valve 607 returns to its original position, the contact part 3053 will return to a horizontal state and support the rotary valve 607.

[0027] In some optional specific embodiments, such as Figure 4 As shown, the guiding assembly includes a rotating base 507 fixedly mounted on the mounting plate 202. A rotating rod 506 is rotatably connected to the rotating base 507, and a guide rod 508 is connected to the end of the rotating rod 506. The insertion pin 501 has a guide hole 505 adapted to the guide rod 508. When connecting the connecting piece to the insertion pin 501, rotating the insertion pin 501 causes the limiting block 502 to pass through the insertion hole 405. Then, rotating the insertion pin 501 causes the insertion hole 405 to be misaligned with the limiting block 502, and the guide rod 508 is rotated into the guide hole 505, preventing the insertion pin 501 from rotating.

[0028] In some optional embodiments, the connecting piece includes two sets of long connecting pieces 403 at the edge and a set of short connecting pieces 404 in the middle. The two sets of long connecting pieces 403 and the short connecting pieces 404 are respectively connected to the fixed port 401 through the rotating shaft 402. The long connecting pieces 403 are provided with two sets of insertion holes 405 for the three branch lines 103 to cross and interconnect. The insertion hole 405 located at the bottom is adapted to the position of the insertion pin 501 in the middle.

[0029] In some optional embodiments, the outer periphery of the three sets of cable detection rings 301 is equipped with an electromagnetic shield to reduce the mutual interference between the three sets of cables 103.

[0030] In some optional embodiments, a signal generator is installed in the grounding box 201 to monitor whether current is regenerated in the disconnected branch line 103 after the pneumatic assembly has operated. If not, the signal generator issues an alarm signal. If automatic repair fails, an alarm signal is sent, allowing for manual repair.

[0031] In some optional embodiments, the bottom of the rack 511 is adapted to be connected to a rack mounting sleeve 512, which is fixedly installed in the grounding box 201.

[0032] In some optional embodiments, the grounding terminal 104 and the branch line 103 are connected by a contact block.

[0033] The working principle of this invention is as follows: During the operation of high-voltage cables, when the line or equipment leaks current, releases three-phase unbalanced voltage, or is struck by lightning, current is generated in the grounding wire 101. At this time, the branch wire 103 connects the current to the ground. The current in the branch wire 103 will cause a change in the surrounding magnetic field, resulting in current being generated in the winding coil 302. The current is connected to the connecting piece and finally grounded through the grounding box 201. Between the connecting piece and the insertion pin 501, by misaligning the limiting block 502 of the insertion pin 501 with the insertion hole 405 on the connecting piece, and with the elastic force of the spring 504, an elastic force is applied to the insertion pin 501, so that the limiting block 502 is in close contact with the connecting piece. When the spring 504 is in long-term contact, the spring force is applied to the insertion pin 501. When the performance of the limiting block 502 deteriorates due to vibration, causing the connection between the limiting block 502 and the connecting piece to loosen, the branch line 103 will be broken. In this case, some of the three branch lines 103 will not generate current. At this time, the pneumatic component is activated to drive the rack 511 to move, thereby causing the rack 511 to mesh with the transmission gear 510 to rotate. The gear 510 is threadedly connected to the insertion pin 501. Under the action of the guiding component, the insertion pin 501 is driven to move, compensating for the performance loss of the spring 504. This re-tightens the connecting piece and the insertion pin 501, realizing the function of automatic repair, ensuring the accuracy of the monitoring device's detection and the stability of its operation, and improving the accuracy of current detection in the cable.

[0034] When one of the branch lines 103 is broken, the micro air pump is filled with air. The rotary valve 607 corresponding to the branch line 103 that is not broken is restricted from rotating, while the rotary valve 607 corresponding to the branch line 103 that is broken rotates under the action of the gas in the biased air passage 606. The gas is filled into the piston cylinder 603, thereby driving the rack 511.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification as described above, which are not provided in detail for the sake of brevity.

[0036] Although this disclosure has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0037] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

Claims

1. A power line grounding monitoring device, characterized in that, include: A grounding wire (101) is connected to a grounding box (201). Three branch wires (103) are connected to the end of the grounding wire (101). Grounding terminals (104) are fixedly connected to the branch wires (103). The grounding terminals (104) are fixedly installed on the mounting plate (202). The mounting plate (202) is fixedly installed in the grounding box (201). A fixing port (401) is installed on the mounting plate (202). The fixing port (401) corresponds one-to-one with the grounding terminal (104). A connecting piece is installed on the fixing port (401). An insertion hole (405) is opened on the connecting piece. An insertion pin (501) is movably installed on the mounting plate (202). A limiting block (502) is provided at the end of the insertion pin (501). The insertion pin (501) is installed through the mounting box. On the plate (202), a spring seat (503) is fitted on the side of the insertion pin (501) away from the connecting piece. A spring (504) is installed between the spring seat (503) and the mounting plate (202). A gear (510) is also threaded to the end of the insertion pin (501) away from the connecting piece. The gear (510) is connected to a mounting shell (509). The mounting shell (509) is fixedly installed in the grounding box (201). The mounting shell (509) has a notch for exposing a part of the gear (510). The exposed part of the gear (510) is meshed with a rack (511). The rack (511) is connected to a pneumatic component. The insertion pin (501) is connected to a guide component. After being connected to the connecting piece, the guide insertion pin (501) can only perform insertion and removal actions. The three branch lines (103) are respectively fitted with cable detection rings (301) around their periphery. The cable detection rings (301) are wound with winding coils (302). The winding coils (302) are connected to ammeters to monitor the current in the three winding coils (302). If the number of winding coils (302) that generate current at the same time is equal to three or equal to zero, it is determined that the connection of the three branch lines (103) is intact. If the number of winding coils (302) that generate current at the same time is less than three or greater than zero, it is determined that the connection of the three branch lines (103) is partially loose. Then the pneumatic component is controlled to work, driving the insertion pin (501) to move and clamp the connecting piece.

2. The power line grounding monitoring device according to claim 1, characterized in that, The pneumatic assembly includes a piston rod (602), one end of which is fixedly connected to a rack (511), and the other end of the piston rod (602) is adapted to be connected to a piston cylinder (603). A piston (604) is connected to the end of the piston rod (602) that is inserted into the piston cylinder (603). An air cylinder (605) is integrally formed above the piston cylinder (603). A deflection air passage (606) is provided in the air cylinder (605), and a rotary valve (6) is provided below the deflection air passage (606). 07), a valve shaft (608) is connected between the rotary valve (607) and the inner wall of the air cylinder (605). A limit pin (305) is provided at the bottom of the rotary valve (607). The limit pin (305) is electrically connected to a winding coil (302). When there is current in the winding coil (302), the limit pin (305) restricts the rotation of the rotary valve (607). The three air cylinders (605) are connected to an air pipe (601). The air pipe (601) is connected to a miniature air pump.

3. The power line grounding monitoring device according to claim 2, characterized in that, A barometer is installed in the piston cylinder (603) to monitor the inflation pressure. When the pressure reaches the pressure threshold, the micro air pump stops pumping. A one-way valve is also installed in the piston cylinder (603) to maintain the pressure in the piston cylinder (603) after inflation.

4. A power line grounding monitoring device according to claim 2, characterized in that, The winding coil (302) is connected to an amplifier circuit (303). The winding coil (302) is electrically connected to a limit pin (305). The limit pin (305) includes a telescopic rod (3051) mounted on a connecting plate (304). The connecting plate (304) is fixedly mounted on a mounting plate (202). The end of the telescopic rod (3051) is connected to an abutment part (3053) via a hinge shaft (3052). The abutment part (3053) is restricted by the hinge shaft (3052) to be able to rotate 180° upward from the horizontal state, but not downward from the horizontal state. The surface of the abutment part (3053) that abuts against the rotary valve (607) is curved. An avoidance groove (6061) adapted to the abutment part (3053) is provided on the inner wall of the deflection air passage (606). A torsion spring is provided on the valve shaft (608) so that the rotary valve (607) has a tendency to return to the horizontal position.

5. A power line grounding monitoring device according to claim 1, characterized in that, The guiding assembly includes a rotating seat (507) fixedly mounted on the mounting plate (202), the rotating seat (507) is rotatably connected to a rotating rod (506), the end of the rotating rod (506) is connected to a guide rod (508), and the insertion pin (501) is provided with a guide hole (505) that matches the guide rod (508).

6. A power line grounding monitoring device according to claim 1, characterized in that, The connecting piece includes two sets of long connecting pieces (403) at the edge and a set of short connecting pieces (404) in the middle. The two sets of long connecting pieces (403) and the short connecting pieces (404) are connected to the fixed port (401) through the rotating shaft (402) respectively. The long connecting piece (403) is provided with two sets of insertion holes (405) for the three branch lines (103) to cross and interconnect. The insertion hole (405) located at the bottom is adapted to the position of the insertion pin (501) in the middle.

7. A power line grounding monitoring device according to claim 1, characterized in that, The three sets of cable detection rings (301) are equipped with electromagnetic shielding covers on their outer periphery.

8. A power line grounding monitoring device according to claim 1, characterized in that, The grounding box (201) is equipped with a signal transmitter, which is used to monitor whether current is generated again in the disconnected branch line (103) after the pneumatic component is working. If not, the signal transmitter will issue an alarm signal.

9. A power line grounding monitoring device according to claim 1, characterized in that, The bottom of the rack (511) is fitted with a rack mounting sleeve (512), which is fixedly installed in the grounding box (201).

10. A power line grounding monitoring device according to claim 1, characterized in that, The grounding terminal (104) and the branch line (103) are connected by a contact block.

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