An on-line monitoring device for distributed transformer core grounding leakage current

Abstract

The present invention relates to the field of transformer monitoring and testing, and particularly to a distributed on-line monitoring device for the leakage current of a transformer core earthing. By directly installing a current sensor on the core earthing wire, the earthing current can be accurately collected, and the earthing wire can be monitored in real time. When a fault occurs in the transformer body, the current sensor transmits the collected current to a motor, and the motor drives an adjustment unit to increase the conductor length in the circuit composed of the current sensor and the motor, thereby increasing the conductor resistance value, reducing the leakage current of the transformer body to within a specified value, and reducing the damage to the transformer body caused by a large core leakage. At the same time, when the output shaft of the motor rotates, it drives a protection unit to work, and the protection unit unfolds to separate the transformer body from the surrounding environment, reminding the personnel near the transformer body that there is a leakage phenomenon in the transformer body, which is convenient for timely notifying the maintenance personnel to repair the transformer body.

Description

Technical Field

[0001] The present invention relates to the field of transformer monitoring and testing, and particularly to a distributed on-line monitoring device for the grounding leakage current of a transformer core. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. It can convert the high-voltage alternating current in the high-voltage transmission line into 220V civil electricity, so it plays an important role in the municipal power project.

[0003] During the use of transformer equipment, leakage may occur due to faults. Therefore, it is necessary to monitor whether the transformer equipment has faults by monitoring the leakage current in the transformer equipment. However, the existing leakage phenomenon of transformer equipment is generally detected regularly by workers holding a test pen in their hands to observe whether the current in the iron core grounding wire exceeds the threshold. Therefore, it is impossible to detect in time that the iron core grounding wire of the transformer leaks electricity and conduct timely troubleshooting and maintenance, which is likely to cause unnecessary economic losses.

[0004] In view of this, to solve the above technical problems, the present invention provides a distributed on-line monitoring device for the grounding leakage current of a transformer core, which solves the above technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention: The existing leakage phenomenon of transformer equipment is generally detected regularly by workers holding a test pen in their hands to observe whether the current in the iron core grounding wire exceeds the threshold. Therefore, it is impossible to detect in time that the iron core grounding wire of the transformer leaks electricity and conduct timely troubleshooting and maintenance, which is likely to cause unnecessary economic losses.

[0006] A distributed on-line monitoring device for the grounding leakage current of a transformer body core provided by the present invention includes a transformer body installed on a support rod and an iron core installed on the transformer body. The on-line monitoring device for the grounding leakage current of the transformer body core further includes: a current sensor, an adjustment unit, a motor, and a protection unit;

[0007] The current sensor is sleeved on the iron core through an induction coil, and the current sensor is used to collect the grounding leakage current of the iron core;

[0008] The adjustment unit is located below the transformer body, and the adjustment unit cooperates with the current sensor to be able to adjust the resistance in the iron core grounding circuit according to the magnitude of the grounding leakage current of the iron core;

[0009] The motor is located between the transformer body and the adjustment unit, and the motor is connected to the current sensor to provide power for the adjustment unit;

[0010] The protection unit is arranged around the transformer body, and the protection unit is used to protect the safety around the transformer body when the iron core leaks electricity.

[0011] Compared with the prior art, workers need to regularly hold an electric pen to detect the iron core of the transformer body in different places to determine whether the transformer body leaks electricity. In the present invention, by directly installing a current sensor on the iron core grounding wire, the grounding current can be accurately collected, and the grounding wire can be monitored in real time. When a fault occurs in the transformer body, the current sensor transmits the collected current to the motor, and the motor drives the adjustment unit to increase the conductor length in the circuit composed of the current sensor and the motor, thereby increasing the conductor resistance value, reducing the leakage current of the transformer body to within the specified value, and reducing the damage to the transformer body caused by the large leakage of the iron core. At the same time, when the output shaft of the motor rotates, it drives the protection unit to work, and the protection unit unfolds, separating the transformer body from the surrounding environment. At the same time, it reminds the people near the transformer body that the transformer body has a leakage phenomenon, which is convenient to timely notify the maintenance personnel to repair the transformer body. Moreover, the unfolded protection unit can remind people not to approach the surrounding of the transformer body at this time, protecting the safety of personnel.

[0012] Preferably, the adjustment unit includes: a support plate, a first bevel gear, a second bevel gear, a first rotating shaft, a second rotating shaft, a third rotating shaft, a first clamping plate, a second clamping plate and a graphite rod;

[0013] Both ends of the support plate are penetrated by the support rod and the iron core. The support plate is fixedly connected to the support rod. The support plate is located below the current sensor. The motor is fixedly installed on the support plate, and the output shaft of the motor penetrates the support plate;

[0014] The first bevel gear is located below the support plate and fixedly installed on the output shaft of the motor;

[0015] The second bevel gear is arranged above the first bevel gear and meshes with the first bevel gear;

[0016] The first rotating shaft is fixedly connected to the center of the second bevel gear;

[0017] The second rotating shaft is fixedly connected to one end of the first rotating shaft away from the output shaft of the motor. Threads are provided on the second rotating shaft;

[0018] The third rotating shaft is fixedly connected to one end of the second rotating shaft away from the first rotating shaft. Threads are provided on the third rotating shaft;

[0019] The threads on the third rotating shaft are opposite in rotation direction to the threads on the second rotating shaft;

[0020] The first clamping plate is threadedly connected to the second rotating shaft, and the upper end of the first clamping plate is slidably connected to the support plate;

[0021] The second clamping plate is threadedly connected to the third rotating shaft, and the upper end of the second clamping plate is slidably connected to the support plate;

[0022] The graphite rod is located below the support plate, and both ends thereof are respectively located within the first clamping plate and the second clamping plate. Both the first clamping plate and the second clamping plate are slidably connected to the graphite rod.

[0023] Preferably, the protection unit includes: an arc-shaped slide rail, a telescopic fence, and a pull rod;

[0024] There are two arc-shaped slide rails located around the transformer body. The arc-shaped slide rails are located below the support plate and in contact with the ground;

[0025] There are two telescopic fences respectively located within the arc-shaped slide rails;

[0026] The telescopic fence includes a plurality of connecting rods and connecting cloth. The connecting cloth is fixedly connected between every two connecting rods. The plurality of connecting rods are arranged in an arc shape and evenly within the arc-shaped slide rail. Among the plurality of connecting rods, the two connecting rods located on the outermost side are rod a and rod b. The end of rod a close to the arc-shaped slide rail, the middle of rod b close to the arc-shaped slide rail. Rod a is fixedly connected to the arc-shaped slide rail. All the other connecting rods among the plurality of connecting rods except rod A are slidably connected to the arc-shaped slide rail. The two telescopic fences are arranged axially symmetrically;

[0027] The center of the pull rod penetrates through the center of the motor output shaft and is fixedly connected to the motor output shaft. Both ends of the pull rod are respectively fixedly connected to rod b in the two arc-shaped slide rails.

[0028] When a fault occurs in the transformer body and core grounding leakage occurs, after the current sensor receives the leakage current from the transformer body on the core, since the motor is connected in series with the current sensor, therefore, the current sensor transmits the collected current to the motor. The motor output shaft rotates forward, the first bevel gear rotates, the rotation of the first bevel gear drives the first rotating shaft to rotate forward through gear meshing, the rotation of the first rotating shaft drives the second rotating shaft to rotate, and the rotation of the second rotating shaft drives the third rotating shaft to rotate. Since the second rotating shaft and the third rotating shaft are fixedly connected as a whole, and the thread directions of the second rotating shaft and the third rotating shaft are opposite, therefore, when the second rotating shaft and the third rotating shaft rotate, they can drive the first clamping plate and the second clamping plate to move away from each other. The mutual separation of the first clamping plate and the second clamping plate causes the length of the graphite rod connected to the circuit to gradually increase, thereby increasing the resistance value with the graphite rod as the resistor, thereby reducing the leakage current of the transformer body to within the specified value, and reducing the damage caused to the transformer body due to a large core leakage;

[0029] Meanwhile, when the motor output shaft rotates, it drives the pull rod to rotate. When the pull rod rotates, it pulls the b-rod, and the b-rod moves along the arc-shaped slide rail under the tension. And through the connecting cloth, a tension is generated on the remaining connecting rods. Multiple connecting rods cooperate with the connecting cloth to unfold along the arc-shaped slide rail, separating the transformer body from the surrounding environment. The unfolded telescopic fence can remind people approaching the transformer body that there is a leakage phenomenon in the transformer body, facilitating timely notification of maintenance personnel to repair the transformer body. And the unfolded protection unit can remind people not to approach the surrounding of the transformer body at this time, protecting the safety of personnel;

[0030] By directly installing the current sensor on the iron core grounding wire, the grounding current can be accurately collected, and the grounding wire can be monitored in real time, and the information can be timely fed back to the maintenance personnel, improving the maintenance efficiency of the transformer body and reducing the work intensity of the staff's regular inspection.

[0031] Preferably, there is a gap between the two arc-shaped slide rails.

[0032] After a leakage fault occurs in the transformer body, the telescopic fence can separate the transformer body from the surrounding environment, protecting the safety of the surrounding personnel, and at the same time facilitating the maintenance personnel to go for maintenance.

[0033] Preferably, both the first rotating shaft and the graphite rod are fixedly connected to the support plate through brackets.

[0034] The first rotating shaft and the graphite rod are fixed, ensuring the stable operation of the mechanism.

[0035] Preferably, the connecting rod is made of insulating material.

[0036] By setting the connecting rod to be made of insulating material, the safety of the telescopic fence can be improved when the transformer body leaks electricity, avoiding accidental contact between personnel and the telescopic fence.

[0037] Preferably, a push-button switch is arranged between multiple connecting rods. When the telescopic fence is in the retracted state, the push-button switch is closed. When the telescopic fence is in the unfolded state, the push-button switch is opened. Alarm lights are installed at the upper ends of the connecting rods, and the alarm lights are electrically connected to the push-button switch.

[0038] When the motor output shaft rotates forward, it drives the pull rod to rotate. When the pull rod rotates, it drives the telescopic fence to unfold. After the telescopic fence unfolds, the gap between multiple connecting rods increases pairwise, and the push-button switch is no longer squeezed by the connecting rods and is released and started. After the push-button switch is started, the alarm lights flash, reminding the surrounding people that there is a leakage fault in the transformer body and not to approach the transformer body, facilitating timely notification of the maintenance personnel to come for maintenance;

[0039] When the maintenance personnel finish repairing the leaking transformer body, when the backup power source drives the motor output shaft to rotate in the reverse direction, it drives the pull rod to rotate in the reverse direction. When the pull rod rotates in the reverse direction, it drives the telescopic fence to contract and fold. After the telescopic fence contracts and folds, the gap between two adjacent connecting rods decreases, squeezing the push button switch, and the push button switch closes, turning off the alarm light.

[0040] Preferably, a sewage discharge groove is provided at one end of the arc-shaped slide rail close to the b-rod.

[0041] When a leakage fault occurs in the transformer body, the motor output shaft rotates forward. When the motor output shaft rotates forward, it first pulls the b-rod to move along the arc-shaped slide rail. Therefore, when the b-rod moves along the arc-shaped slide rail, the sundries in the arc-shaped slide rail can be pushed into the sewage discharge groove, preventing excessive accumulation of sundries in the arc-shaped slide rail and causing the telescopic fence to fail to contract normally.

[0042] The beneficial effects of the present invention are as follows:

[0043] A distributed on-line monitoring device for the leakage current of the core of a transformer body provided by the present invention can accurately collect the grounding current by directly installing a current sensor on the core grounding wire, and can monitor the grounding wire in real time. When a fault occurs in the transformer body, the current sensor transmits the collected current to the motor, and the motor drives the adjustment unit to increase the conductor length in the circuit composed of the current sensor and the motor, thereby increasing the conductor resistance value, reducing the leakage current of the transformer body to within the specified value, and reducing the damage to the transformer body caused by a large core leakage. At the same time, when the motor output shaft rotates, it drives the protection unit to work, and the protection unit unfolds, separating the transformer body from the surrounding environment, and at the same time reminding the people near the transformer body that there is a leakage phenomenon in the transformer body, facilitating timely notification of the maintenance personnel to repair the transformer body. Moreover, the unfolded protection unit can remind people not to approach the surrounding of the transformer body at this time, protecting the safety of personnel;

[0044] When the telescopic fence is opened, it triggers the alarm light to flash, reminding the surrounding people that a leakage fault has occurred in the transformer body and not to approach the transformer body, facilitating timely notification of the maintenance personnel to come for repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to specific embodiments in conjunction with the drawings.

[0046] Figure 1 is the external structure schematic diagram of the present invention;

[0047] Figure 2 is the top view structure schematic diagram of the present invention;

[0048] Figure 3 is the distribution structure schematic diagram of the arc-shaped slide rail of the present invention;

[0049] Figure 4 For the present invention Figure 2 Enlarged view at position A in

[0050] Figure 5 For the present invention Figure 3 Enlarged view at position B in

[0051] Figure 6 Front view structural schematic diagram of the adjustment unit of the present invention;

[0052] Figure 7 Structural schematic diagram of the adjustment unit of the present invention;

[0053] In the figure: support rod 1, transformer body 2, iron core 3, current sensor 4, adjustment unit 5, support plate 51, first bevel gear 52, second bevel gear 53, first rotating shaft 54, second rotating shaft 55, third rotating shaft 56, first clamping plate 57, second clamping plate 58, graphite rod 59, motor 6, protection unit 7, arc-shaped slide rail 71, telescopic fence 72, connecting rod 721, connecting cloth 722, a rod 723, b rod 724, pull rod 73, bracket 8, push button switch 9, alarm lamp 10, sewage discharge groove 11. Detailed implementation manners

[0054] 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.

[0055] As Figures 1 to 7 shown, a distributed transformer body 2 iron core 3 ground leakage current online monitoring device provided by the present invention includes a transformer body 2 installed on a support rod 1 and an iron core 3 installed on the transformer body 2. The transformer body 2 iron core 3 ground leakage current online monitoring device further includes: a current sensor 4, an adjustment unit 5, a motor 6, and a protection unit 7;

[0056] The current sensor 4 is sleeved on the iron core 3 through an induction coil, and the current sensor 4 is used to collect the ground leakage current of the iron core 3;

[0057] The adjustment unit 5 is located below the transformer body 2, and the adjustment unit 5 cooperates with the current sensor 4 to be able to adjust the resistance in the ground circuit of the iron core 3 according to the magnitude of the ground leakage current of the iron core 3;

[0058] The motor 6 is located between the transformer body 2 and the adjustment unit 5, and the motor 6 is connected to the current sensor 4 to provide power for the adjustment unit 5;

[0059] The protection unit 7 is arranged around the transformer body 2, and the protection unit 7 is used to protect the safety around the transformer body 2 when the iron core 3 has a leakage current;

[0060] By adopting the above technical solution, when a fault occurs in the transformer body 2 and the iron core 3 has a ground leakage current, after the current sensor 4 receives the leakage current from the transformer body 2 on the iron core 3, since the motor 6 is in series with the current sensor 4, therefore, the current sensor 4 transmits the collected current to the motor 6, and the output shaft of the motor 6 rotates to drive the adjustment unit 5 to work. When the adjustment unit 5 works, it increases the conductor length in the circuit composed of the current sensor 4 and the motor 6, thereby increasing the conductor resistance value, reducing the leakage current of the transformer body 2 to within the specified value, and reducing the damage caused to the transformer body 2 due to the large leakage current of the iron core 3;

[0061] At the same time, when the output shaft of the motor 6 rotates, it drives the protection unit 7 to work, and the protection unit 7 unfolds, separating the transformer body 2 from the surrounding environment. At the same time, it reminds the people near the transformer body 2 that there is a leakage phenomenon in the transformer body 2, which is convenient for timely notifying the maintenance personnel to repair the transformer body 2, and the unfolded protection unit 7 can remind people not to approach the surrounding of the transformer body 2 at this time, protecting the safety of personnel;

[0062] Compared with the prior art, the staff needs to regularly hold an electric pen to detect the iron core 3 of the transformer body 2 in different places to determine whether the transformer body 2 has a leakage current. In the present invention, by directly installing the current sensor 4 on the grounding wire of the iron core 3, the grounding current can be accurately collected and the grounding wire can be monitored in real time. When a fault occurs in the transformer body 2, the current sensor 4 transmits the collected current to the motor 6, and the motor 6 drives the adjustment unit 5 to increase the conductor length in the circuit composed of the current sensor 4 and the motor 6, thereby increasing the conductor resistance value, reducing the leakage current of the transformer body 2 to within the specified value, and reducing the damage caused to the transformer body 2 due to the large leakage current of the iron core 3. At the same time, when the output shaft of the motor 6 rotates, it drives the protection unit 7 to work, and the protection unit 7 unfolds, separating the transformer body 2 from the surrounding environment. At the same time, it reminds the people near the transformer body 2 that there is a leakage phenomenon in the transformer body 2, which is convenient for timely notifying the maintenance personnel to repair the transformer body 2, and the unfolded protection unit 7 can remind people not to approach the surrounding of the transformer body 2 at this time, protecting the safety of personnel.

[0063] Such as Figures 1 to 7As shown in the figure, as a specific embodiment of the present invention, the adjusting unit 5 includes: a support plate 51, a first bevel gear 52, a second bevel gear 53, a first rotating shaft 54, a second rotating shaft 55, a third rotating shaft 56, a first clamping plate 57, a second clamping plate 58, and a graphite rod 59;

[0064] Both ends of the support plate 51 are penetrated by the support rod 1 and the iron core 3. The support plate 51 is fixedly connected to the support rod 1. The support plate 51 is located below the current sensor 4. The motor 6 is fixedly installed on the support plate 51, and the output shaft of the motor 6 penetrates the support plate 51;

[0065] The first bevel gear 52 is located below the support plate 51 and fixedly installed on the output shaft of the motor 6;

[0066] The second bevel gear 53 is arranged above the first bevel gear 52 and meshes with the first bevel gear 52;

[0067] The first rotating shaft 54 is fixedly connected to the center of the second bevel gear 53;

[0068] The second rotating shaft 55 is fixedly connected to one end of the first rotating shaft 54 away from the output shaft of the motor 6. Threads are provided on the second rotating shaft 55;

[0069] The third rotating shaft 56 is fixedly connected to one end of the second rotating shaft 55 away from the first rotating shaft 54. Threads are provided on the third rotating shaft 56;

[0070] The threads on the third rotating shaft 56 have a reverse helix direction to the threads on the second rotating shaft 55;

[0071] The first clamping plate 57 is threadedly connected to the second rotating shaft 55, and the upper end of the first clamping plate 57 is slidably connected to the support plate 51;

[0072] The second clamping plate 58 is threadedly connected to the third rotating shaft 56, and the upper end of the second clamping plate 58 is slidably connected to the support plate 51;

[0073] The graphite rod 59 is located below the support plate 51, and its two ends are respectively located within the first clamping plate 57 and the second clamping plate 58. Both the first clamping plate 57 and the second clamping plate 58 are slidably connected to the graphite rod 59;

[0074] The protection unit 7 includes: an arc-shaped slide rail 71, a telescopic fence 72, and a pull rod 723;

[0075] There are two arc-shaped slide rails 71 located around the transformer body 2. The arc-shaped slide rails 71 are located below the support plate 51 and in contact with the ground;

[0076] There are two telescopic fences 72 respectively located within the arc-shaped slide rails 71;

[0077] The telescopic fence 72 includes a plurality of connecting rods 721 and a connecting cloth 722. The connecting cloth 722 is fixedly connected between every two of the connecting rods 721. The plurality of connecting rods 721 are evenly arranged in an arc in the arc-shaped slide rail 71. Among the plurality of connecting rods 721, the two outermost connecting rods 721 are the a-rod 723 and the b-rod 723. The end of the a-rod 723 is close to the arc-shaped slide rail 71, and the middle part of the b-rod 724 is close to the arc-shaped slide rail 71. The a-rod 723 is fixedly connected to the arc-shaped slide rail 71. All the connecting rods 721 except the a-rod 723 among the plurality of connecting rods 721 are slidably connected to the arc-shaped slide rail 71. The two telescopic fences 72 are arranged axially symmetrically;

[0078] The center of the pull rod 73 penetrates through the center of the output shaft of the motor 6 and is fixedly connected to the output shaft of the motor 6. The two ends of the pull rod 73 are respectively fixedly connected to the b-rods 724 in the two arc-shaped slide rails 71;

[0079] By adopting the above technical solution, when a fault occurs in the transformer body 2 and the iron core 3 is grounded and leaks electricity, after the current sensor 4 receives the leakage current from the transformer body 2 on the iron core 3, since the motor 6 is connected in series with the current sensor 4, the current sensor 4 transmits the collected current to the motor 6. The output shaft of the motor 6 rotates forward, and the first bevel gear 52 rotates. The rotation of the first bevel gear 52 drives the first rotating shaft 54 to rotate forward through gear meshing. The rotation of the first rotating shaft 54 drives the second rotating shaft 55 to rotate. The rotation of the second rotating shaft 55 drives the third rotating shaft 56 to rotate. Since the second rotating shaft 55 and the third rotating shaft 56 are fixedly connected as a whole, and the thread directions of the second rotating shaft 55 and the third rotating shaft 56 are opposite, when the second rotating shaft 55 and the third rotating shaft 56 rotate, they can drive the first clamping plate 57 and the second clamping plate 58 to move away from each other. The mutual separation of the first clamping plate 57 and the second clamping plate 58 makes the length of the graphite rod 59 in the access circuit gradually increase, so that the resistance value of the graphite rod 59 as a resistor increases, thereby reducing the leakage current of the transformer body 2 to within the specified value and reducing the damage to the transformer body 2 caused by the large leakage of the iron core 3;

[0080] At the same time, when the output shaft of the motor 6 rotates, it drives the pull rod 73 to rotate. When the pull rod 73 rotates, it pulls the b-rod 724. The b-rod 724 moves along the arc-shaped slide rail 71 under the action of the pulling force, and generates a pulling force on the remaining connecting rods 721 through the connecting cloth 722. The plurality of connecting rods 721 cooperate with the connecting cloth 722 to unfold along the arc-shaped slide rail 71, separating the transformer body 2 from the surrounding environment. The unfolded telescopic fence 72 can remind the personnel approaching the transformer body 2 that the transformer body 2 has a leakage phenomenon, which is convenient to timely notify the maintenance personnel to repair the transformer body 2, and the unfolded protection unit 7 can remind people not to approach the surrounding of the transformer body 2 at this time, protecting the safety of personnel;

[0081] When the maintenance personnel finish repairing the leaking transformer body 2, the staff starts the backup power supply above the motor 6. The backup power supply drives the output shaft of the motor 6 to reverse. The reverse rotation of the output shaft of the motor 6 drives the first bevel gear 52 to rotate in the reverse direction. The reverse rotation of the first bevel gear 52 drives the second rotating shaft 55 and the third rotating shaft 56 to rotate in the reverse direction through gear meshing, thereby driving the first clamping plate 57 and the second clamping plate 58 to move closer to each other, and the first clamping plate 57 and the second clamping plate 58 return to the initial state when the transformer body 2 is normal;

[0082] At the same time, when the output shaft of the motor 6 rotates in the reverse direction, it drives the pull rod 73 to rotate in the reverse direction. When the pull rod 73 rotates in the reverse direction, it pushes the b-rod 724. The b-rod 724 moves in the reverse direction along the arc-shaped slide rail 71 under the thrust, and generates a thrust on the remaining connecting rods 721. The multiple connecting rods 721 cooperate with the connecting cloth 722 to contract and fold along the arc-shaped slide rail 71. After the retractable fence is stored, the staff turns off the backup power supply of the motor 6;

[0083] And by directly installing the current sensor 4 on the grounding wire of the iron core 3, the grounding current can be accurately collected, and the grounding wire can be monitored in real time, and the information can be fed back to the maintenance personnel in time, improving the maintenance efficiency of the transformer body 2 and reducing the work intensity of the staff's regular detection.

[0084] Such as Figure 2 shown, as a specific embodiment of the present invention, there is a gap between the two arc-shaped slide rails 71;

[0085] By adopting the above technical solution, by leaving a gap between the two arc-shaped slide rails 71, after the transformer body 2 has a leakage fault, while the retractable fence 72 can separate the transformer body 2 from the surrounding environment and protect the safety of the surrounding personnel, it is convenient for the maintenance personnel to go for maintenance.

[0086] Such as Figure 6 and Figure 7 shown, as a specific embodiment of the present invention, the first rotating shaft 54 and the graphite rod 59 are both fixedly connected to the support plate 51 through the bracket 8;

[0087] By adopting the above technical solution, the first rotating shaft 54 and the graphite rod 59 are fixed, ensuring the stable operation of the mechanism.

[0088] As a specific embodiment of the present invention, the connecting rod 721 is made of insulating material;

[0089] By adopting the above technical solution, by setting the connecting rod 721 to be made of insulating material, the safety of the retractable fence 72 can be improved when the transformer body 2 leaks electricity, and it can prevent personnel from accidentally contacting the retractable fence 72.

[0090] As Figure 4 and Figure 5 shown, as a specific embodiment of the present invention, a push button switch 9 is provided between multiple said connecting rods 721. When the telescopic fence 72 is in a contracted state, the push button switch 9 is closed. When the telescopic fence 72 is in an expanded state, the push button switch 9 is turned on. Alarm lights 10 are installed at the upper ends of the connecting rods 721, and the alarm lights 10 are electrically connected to the push button switch 9;

[0091] By adopting the above technical solution, when the output shaft of the motor 6 rotates forward, the pull rod 73 is driven to rotate. When the pull rod 73 rotates, the telescopic fence 72 is driven to expand. After the telescopic fence 72 expands, the gap between multiple connecting rods 721 increases pairwise, and the push button switch 9 is no longer squeezed by the connecting rods 721 and is released and activated. After the push button switch 9 is activated, the alarm lights 10 flash, reminding the surrounding people that the transformer body 2 has a leakage fault and not to approach the transformer body 2, which is convenient to timely notify the maintenance personnel to come for maintenance;

[0092] When the maintenance personnel complete the repair of the leaking transformer body 2, the backup power source drives the output shaft of the motor 6 to rotate reversely, driving the pull rod 73 to rotate reversely. When the pull rod 73 rotates reversely, the telescopic fence 72 is driven to contract and fold. After the telescopic fence 72 contracts and folds, the gap between multiple connecting rods 721 decreases pairwise, squeezing the push button switch 9, and the push button switch 9 is closed, and the alarm lights 10 are turned off.

[0093] As Figure 1 shown, as a specific embodiment of the present invention, a sewage discharge groove 11 is provided at one end of the arc-shaped slide rail 71 close to the b-rod 724;

[0094] By adopting the above technical solution, when the transformer body 2 has a leakage fault, the output shaft of the motor 6 rotates forward. When the output shaft of the motor 6 rotates forward, it first pulls the b-rod 724 to move along the arc-shaped slide rail 71. Therefore, when the b-rod 724 moves along the arc-shaped slide rail 71, the sundries in the arc-shaped slide rail 71 can be pushed into the sewage discharge groove 11, preventing excessive accumulation of sundries in the arc-shaped slide rail 71 from causing the telescopic fence 72 to not contract normally.

[0095] Working principle: When a fault occurs in the transformer body 2 and there is a ground leakage of the iron core 3, after the current sensor 4 receives the leakage current from the transformer body 2 on the iron core 3, since the motor 6 is connected in series with the current sensor 4, the current sensor 4 transmits the collected current to the motor 6. The output shaft of the motor 6 rotates forward, causing the first bevel gear 52 to rotate. The rotation of the first bevel gear 52 drives the first rotating shaft 54 to rotate forward through gear meshing. The rotation of the first rotating shaft 54 drives the second rotating shaft 55 to rotate. The rotation of the second rotating shaft 55 drives the third rotating shaft 56 to rotate. Since the second rotating shaft 55 and the third rotating shaft 56 are fixedly connected as a whole and the thread directions on the second rotating shaft 55 and the third rotating shaft 56 are opposite, when the second rotating shaft 55 and the third rotating shaft 56 rotate, they can drive the first clamping plate 57 and the second clamping plate 58 to move away from each other. The mutual separation of the first clamping plate 57 and the second clamping plate 58 causes the length of the graphite rod 59 connected to the circuit to gradually increase, thereby increasing the resistance value with the graphite rod 59 as the resistor, and reducing the leakage current of the transformer body 2 to within the specified value, reducing the damage to the transformer body 2 caused by the large leakage of the iron core 3;

[0096] At the same time, when the output shaft of the motor 6 rotates, it drives the pull rod 73 to rotate. When the pull rod 73 rotates, it pulls the b-rod 724. The b-rod 724 moves along the arc-shaped slide rail 71 under the tensile force, and generates a tensile force on the remaining connecting rods 721 through the connecting cloth 722. Multiple connecting rods 721 cooperate with the connecting cloth 722 to unfold along the arc-shaped slide rail 71, separating the transformer body 2 from the surrounding environment. The unfolded telescopic fence 72 can remind the personnel approaching the transformer body 2 that there is a leakage phenomenon in the transformer body 2, facilitating timely notification to the maintenance personnel for inspection of the transformer body 2, and the deployed protection unit 7 can remind people not to approach the surrounding of the transformer body 2 at this time, protecting the safety of personnel;

[0097] After the maintenance personnel complete the repair of the leaking transformer body 2, the staff starts the backup power supply above the motor 6. The backup power supply drives the output shaft of the motor 6 to rotate in the reverse direction. The reverse rotation of the output shaft of the motor 6 drives the first bevel gear 52 to rotate in the reverse direction. The reverse rotation of the first bevel gear 52 drives the second rotating shaft 55 and the third rotating shaft 56 to rotate in the reverse direction through gear meshing, thereby driving the first clamping plate 57 and the second clamping plate 58 to move closer to each other, and the first clamping plate 57 and the second clamping plate 58 return to the initial state when the transformer body 2 is normal;

[0098] At the same time, when the output shaft of the motor 6 rotates in the reverse direction, it drives the pull rod 73 to rotate in the reverse direction. When the pull rod 73 rotates in the reverse direction, it pushes the b-rod 724. The b-rod 724 moves along the arc-shaped slide rail 71 in the reverse direction under the thrust, and generates a thrust on the remaining connecting rods 721. Multiple connecting rods 721 cooperate with the connecting cloth 722 to contract and fold along the arc-shaped slide rail 71. After the telescopic fence is stored, the staff turns off the backup power supply of the motor 6;

[0099] Moreover, by directly installing the current sensor 4 on the grounding wire of the iron core 3, the grounding current can be accurately collected, and the grounding wire can be monitored in real time, and the information can be promptly fed back to the maintenance personnel, improving the maintenance efficiency of the transformer body 2 and reducing the work intensity of the staff for regular detection;

[0100] When the output shaft of the motor 6 rotates forward, it drives the pull rod 73 to rotate. When the pull rod 73 rotates, it drives the telescopic fence 72 to unfold. After the telescopic fence 72 unfolds, the gap between two adjacent connecting rods 721 increases. The push button switch 9 is no longer squeezed by the connecting rods 721 and is released to start. After the push button switch 9 starts, the alarm lamp 10 flashes, reminding the surrounding people that the transformer body 2 has a leakage fault and they must not approach the transformer body 2, which is convenient for promptly notifying the maintenance personnel to come for maintenance;

[0101] When the maintenance personnel complete the repair of the leaking transformer body 2, the backup power supply drives the output shaft of the motor 6 to rotate reversely, which drives the pull rod 73 to rotate reversely. When the pull rod 73 rotates reversely, it drives the telescopic fence 72 to contract and fold. After the telescopic fence 72 contracts and folds, the gap between two adjacent connecting rods 721 decreases, squeezing the push button switch 9, and the push button switch 9 is turned off, and the alarm lamp 10 is turned off.

[0102] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claim.

Claims

1. An on-line monitoring device for grounding leakage current of a distributed transformer core, comprising a transformer body (2) installed on a support rod (1) and a core (3) installed on the transformer body (2), characterized in that: The on-line monitoring device for the grounding leakage current of the iron core (3) of the transformer body (2) further includes: a current sensor (4), an adjustment unit (5), a motor (6) and a protection unit (7); The current sensor (4) is sleeved on the iron core (3) through an induction coil, and the current sensor (4) is used to collect the grounding leakage current of the iron core (3); The adjustment unit (5) is located below the transformer body (2), and the adjustment unit (5) cooperates with the current sensor (4) to be able to adjust the resistance in the grounding circuit of the iron core (3) according to the magnitude of the grounding leakage current of the iron core (3); The motor (6) is located between the transformer body (2) and the adjustment unit (5), and the motor (6) is connected to the current sensor (4) to provide power for the adjustment unit (5); The protection unit (7) is arranged around the transformer body (2), and the protection unit (7) is used to protect the safety around the transformer body (2) when the iron core (3) leaks electricity; The protection unit (7) includes: an arc-shaped slide rail (71), a telescopic fence (72) and a pull rod (73); There are two arc-shaped slide rails (71) and they are located around the transformer body (2). The arc-shaped slide rail (71) is located below the support plate (51) and contacts the ground; There are two telescopic fences (72) and they are respectively located in the arc-shaped slide rails (71); The telescopic fence (72) includes a plurality of connecting rods (721) and a connecting cloth (722). The connecting cloth (722) is fixedly connected between every two of the connecting rods (721). The plurality of connecting rods (721) are evenly arranged in an arc shape in the arc-shaped slide rail (71). Among the plurality of connecting rods (721), the two connecting rods (721) located on the outermost side are the a-rod (723) and the b-rod (724). The a-rod (723) is close to the end of the arc-shaped slide rail (71), and the b-rod (724) is close to the middle of the arc-shaped slide rail (71). The a-rod (723) is fixedly connected to the arc-shaped slide rail (71). The rest of the connecting rods (721) among the plurality of connecting rods (721) except the a-rod (723) are all slidably connected to the arc-shaped slide rail (71). The two telescopic fences (72) are arranged axially symmetrically; The center of the pull rod (73) penetrates through the center of the output shaft of the motor (6) and is fixedly connected to the output shaft of the motor (6). The two ends of the pull rod (73) are respectively fixedly connected to the b-rods (724) in the two arc-shaped slide rails (71).

2. The on-line monitoring device for the earth leakage current of a distributed transformer core according to claim 1, wherein: The adjustment unit (5) includes: a support plate (51), a first bevel gear (52), a second bevel gear (53), a first rotating shaft (54), a second rotating shaft (55), a third rotating shaft (56), a first clamping plate (57), a second clamping plate (58) and a graphite rod (59); Both ends of the support plate (51) are penetrated by the support rod (1) and the iron core (3). The support plate (51) is fixedly connected to the support rod (1). The support plate (51) is located below the current sensor (4). The motor (6) is fixedly installed on the support plate (51), and the output shaft of the motor (6) penetrates through the support plate (51); The first bevel gear (52) is located below the support plate (51) and fixedly installed on the output shaft of the motor (6); The second bevel gear (53) is arranged above the first bevel gear (52) and meshes with the first bevel gear (52); The first rotating shaft (54) is fixedly connected to the center of the second bevel gear (53); The second rotating shaft (55) is fixedly connected to one end of the first rotating shaft (54) far from the output shaft of the motor (6), and a thread is provided on the second rotating shaft (55); The third rotating shaft (56) is fixedly connected to one end of the second rotating shaft (55) far from the first rotating shaft (54), and a thread is provided on the third rotating shaft (56); The thread on the third rotating shaft (56) has a reverse helix direction to the thread on the second rotating shaft (55); The first clamping plate (57) is threadedly connected to the second rotating shaft (55), and the upper end of the first clamping plate (57) is slidably connected to the support plate (51); The second clamping plate (58) is threadedly connected to the third rotating shaft (56), and the upper end of the second clamping plate (58) is slidably connected to the support plate (51); The graphite rod (59) is located below the support plate (51), and both ends thereof are respectively located in the first clamping plate (57) and the second clamping plate (58), and both the first clamping plate (57) and the second clamping plate (58) are slidably connected to the graphite rod (59).

3. The on-line monitoring device for the grounding leakage current of a distributed transformer core according to claim 1, characterized in that: A gap is left between the two arc-shaped slide rails (71).

4. The on-line monitoring device for the grounding leakage current of a distributed transformer core according to claim 2, characterized in that: Both the first rotating shaft (54) and the graphite rod (59) are fixedly connected to the support plate (51) through the bracket (8).

5. The on-line monitoring device for distributed transformer core grounding leakage current according to claim 1, characterized in that: The connecting rod (721) is made of an insulating material.

6. The on-line monitoring device for distributed transformer core grounding leakage current according to claim 1, characterized in that: A push-button switch (9) is arranged between multiple connecting rods (721). When the retractable fence (72) is in a retracted state, the push-button switch (9) is closed. When the retractable fence (72) is in an unfolded state, the push-button switch (9) is opened. Alarm lights (10) are installed at the upper ends of the connecting rods (721), and the alarm lights (10) are electrically connected to the push-button switch (9).

7. The on-line monitoring device for the earth leakage current of a distributed transformer core according to claim 4, characterized in that: A sewage discharge groove (11) is provided at one end of the arc-shaped slide rail (71) close to the b-rod (724).

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