An online monitoring device for grounding current of transformer core clamps

Abstract

This utility model provides an online monitoring device for grounding current of transformer core clamps, belonging to the field of grounding monitoring technology for core clamps. It includes a mounting frame and a flat steel overlapping assembly. The mounting frame includes a lower mounting plate and an upper mounting plate, with an angle steel support column fixed between them. A first right-angle plate is provided at both ends of the upper mounting plate along its length. The flat steel overlapping assembly includes a shaft, which is positioned between two first right-angle plates. Several overlapping rods are spaced apart on the outside of the shaft. A transmission device is provided on the upper mounting plate to control the rotation of the shaft. A spring tension rod is provided between the shaft and the upper mounting plate. A current monitoring device is installed inside the mounting frame, electrically connected to the overlapping rods and the transmission device. This invention solves the problems of high labor costs, insufficient monitoring frequency, and easy missed detections associated with existing manual monitoring methods.

Description

Technical Field

[0001] This utility model relates to the field of core clamp grounding monitoring technology, and more specifically, to an online monitoring device for grounding current of transformer core clamps. Background Technology

[0002] During the operation of a power transformer, the core, as the core magnetic circuit component, is composed of stacked high-silicon content silicon steel sheets. Its upper and lower yokes are mechanically fixed by clamps. Under normal operation, the core needs to be grounded at a single point to eliminate floating potential, and this current value is normally very small. However, when a multi-point grounding fault occurs, an abnormal conductive loop is formed between the core and the ground, causing the grounding current to surge to the ampere level, leading to serious safety hazards such as local overheating and insulation degradation.

[0003] Current detection technologies primarily employ current monitoring devices, which consist of current clamps and a portable host unit for periodic testing. These devices require manual installation and data recording, and this traditional monitoring method has significant limitations: the frequency of manual inspections is constrained by maintenance personnel, making high-frequency continuous monitoring difficult; excessively long monitoring frequencies result in data acquisition gaps, failing to fully capture sudden fault characteristics; and the regular inspection system is susceptible to human error, posing a risk of missed inspections. With the expansion of power grids and the increase in transformer capacity, traditional monitoring methods are insufficient to meet the real-time equipment status requirements of modern power systems, necessitating the development of solutions with continuous monitoring capabilities. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides an online monitoring device for grounding current of transformer core clamps, which is used to solve the above problems.

[0005] This utility model is implemented as follows: A transformer core clamp grounding current online monitoring device includes a mounting frame and a flat steel overlapping assembly. The mounting frame includes a lower mounting plate and an upper mounting plate, with an angle steel support column fixed between them. A first right-angle plate is provided at both ends of the upper mounting plate along its length. The flat steel overlapping assembly includes a shaft, which is positioned between two of the first right-angle plates. A plurality of overlapping rods are spaced apart on the outside of the shaft. A transmission device is provided on the upper mounting plate to control the rotation of the shaft. A spring tension rod is provided between the shaft and the upper mounting plate. A current monitoring device is installed inside the mounting frame and is electrically connected to the overlapping rods and the transmission device.

[0006] Furthermore, the interior of the lap rod is a hollow structure.

[0007] Furthermore, one end of the lap rod is fixedly disposed on the outside of the lap rod, and an anchor rod penetrating into the interior is disposed at the contact position between the lap rod and the shaft rod, and an arc-shaped plate is disposed at the other end of the lap rod.

[0008] Furthermore, the current monitoring device is equipped with the same number of probes as the overlapping rods, with each probe located inside the shaft at the anchor rod and in contact with it.

[0009] Furthermore, a through hole is provided on one side of the top of the upper mounting plate, through which the data cable of the probe passes through the shaft and is electrically connected to the current monitoring device.

[0010] Furthermore, the shaft is made of insulating material, while the connecting rod and the arc-shaped plate are made of conductive metal material.

[0011] Furthermore, the shaft is made of carbon fiber or epoxy resin, and the connecting rod and the arc-shaped plate are made of copper or aluminum.

[0012] Furthermore, the transmission device includes a drive motor disposed at the bottom of the upper mounting plate, the output shaft of the drive motor passing through the upper mounting plate, and a first helical gear disposed at its end, and a second helical gear meshing with the first helical gear disposed on the outer side of the shaft.

[0013] Furthermore, there are two spring tension rods, and a second right-angle plate is provided on the shaft near the spring tension rod to enhance the rotational stability of the shaft.

[0014] Furthermore, the spring tension rod includes a telescopic rod, and both the bottom of the telescopic rod and the end of its output shaft are provided with abutment plates. A first mounting seat is provided on the shaft, and a second mounting seat is provided on the top of the upper mounting plate in a direction perpendicular to the first mounting seat. The telescopic rod is disposed between the first mounting seat and the second mounting seat, and a spring is provided between the two abutment plates.

[0015] The beneficial effects of this utility model are as follows: Through the synergistic innovation of automated mechanical structure and control module, continuous monitoring of iron core grounding current is achieved. Specifically, the PLC controller has a built-in timed execution program that starts the drive motor according to a preset cycle. The drive motor rotates through a helical gear transmission mechanism, causing the conductive connecting rods arranged at equal intervals on the shaft to come into contact with the transformer flat steel grounding wire in a non-contact swing manner, forming a temporary conductive circuit. At this time, the current monitoring device conducts through the probe inside the shaft to the connecting rod, completing the current data acquisition. Subsequently, the spring reset mechanism drives the shaft to rotate, achieving automatic separation. Compared with the traditional manual monitoring scheme, this device can collect data fully automatically, replacing manual inspection with a preset monitoring cycle, significantly reducing labor costs. At the same time, the monitoring frequency can be adjusted within a wider range. Data integrity is guaranteed. The continuous monitoring mode, combined with the PLC storage function, can build a grounding current time series database. Fault trend prediction can be achieved by comparing historical data, improving the accuracy of anomaly identification compared with propagation detection methods. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an online monitoring device for grounding current of a transformer core clamp provided for an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 A schematic diagram of the structure of the spring tension rod provided for an embodiment of this utility model; Figure 4 The embodiments provided are for implementing the present utility model.

[0018] In the diagram: 10. Mounting bracket; 11. Lower mounting plate; 12. Upper mounting plate; 1201. Through hole; 1202. First right-angle plate; 1203. Second right-angle plate; 20. Flat steel lap joint assembly; 21. Shaft; 22. Lap joint rod; 2201. Arc plate; 23. Transmission device; 2301. Drive motor; 2302. First helical gear; 2303. Second helical gear; 24. Spring tension rod; 2401. First mounting base; 2402. Second mounting base; 2403. Telescopic rod; 2404. Spring; 30. Current monitoring device; 40. Transformer body; 41. Flat steel grounding wire. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] like Figure 1-3 As shown, this utility model provides an online monitoring device for grounding current of transformer core clamps, including a mounting frame 10 and a flat steel overlapping assembly 20. The mounting frame 10 includes a lower mounting plate 11 and an upper mounting plate 12, with an angle steel support column fixed between them. The upper mounting plate 12 has a first right angle plate 1202 at both ends along its length. The flat steel overlapping assembly 20 includes a shaft 21, which is positioned between two first right angle plates 1202. Several overlapping rods 22 are spaced apart on the outside of the shaft 21. A transmission device 23 is mounted on the upper mounting plate 12 to control the rotation of the shaft 21. A spring tension rod 24 is positioned between the shaft 21 and the upper mounting plate 12. A current monitoring device 30 is installed inside the mounting frame 10. The current monitoring device 30 is electrically connected to the overlapping rods 22 and the transmission device 23. The current monitoring device 30 integrates a PLC controller, which is mainly used to control the operation of the transmission device 23, specifically including a timed execution program that sets the interval for starting the transmission device 23.

[0022] The specific rule is that the drive motor 2301 is started every 20-40 minutes. The drive motor 2301 drives the shaft 21 to rotate, so that the flat steel overlapping component 20 acts as an intermediate part to assist the probe on the current monitoring device 30 to connect with the flat steel grounding wire 41 for current data acquisition. The overlapping time is 5-10 seconds. After the overlapping time, the power supply to the drive motor 2301 is disconnected, so that it is separated by the spring tension rod 24.

[0023] It should be noted that the length of the shaft 21 and the number and spacing of the overlapping rods 22 need to be customized according to the number and spacing of the corresponding flat steel grounding wires 41 in the transformer body model 40, so as to ensure that each overlapping rod 22 corresponds to the grounding wire of the transformer steel plate when the monitoring device is performing the test.

[0024] In this embodiment, the interior of the overlapping rod 22 is a hollow structure.

[0025] In this embodiment, one end of the lap rod 22 is fixedly disposed on the outside of the lap rod 22, and an anchor rod penetrating into the interior is disposed at the contact position between the lap rod 22 and the shaft rod 21. The other end of the lap rod 22 is provided with an arc plate 2201. The arc plate 2201 is mainly used to increase the contact area of ​​the lap rod 22 and increase the error range of the monitoring device when installed near the transformer body 40.

[0026] Furthermore, the current monitoring device 30 is equipped with the same number of probes as the overlapping rod 22, with each probe located inside the shaft 21 at the anchor rod and in contact with it.

[0027] Furthermore, a through hole 1201 is provided on one side of the top of the upper mounting plate 12, through which the probe's data cable passes through the shaft 21 and is electrically connected to the current monitoring device 30.

[0028] In a preferred embodiment, the shaft 21 is made of insulating material, including carbon fiber or epoxy resin, both of which have sufficient strength to meet the torque requirements of the device. The overlapping rod 22 and the arc plate 2201 are made of conductive metal material, such as copper or aluminum. This structure enables the complete separation of several overlapping rods 22, avoiding short circuits that could affect the measurement and the current monitoring device 30.

[0029] Furthermore, the transmission device 23 includes a drive motor 2301 disposed at the bottom of the upper mounting plate 12. The output shaft of the drive motor 2301 passes through the upper mounting plate 12, and a first helical gear 2302 is disposed at its end. A second helical gear 2303 that meshes with the first helical gear 2302 is disposed on the outer side of the shaft 21.

[0030] Furthermore, there are two spring tension rods 24, and a second right-angle plate 1203 is also provided on the shaft 21 near the spring tension rods 24 to enhance the rotational stability of the shaft 21.

[0031] Furthermore, the spring tension rod 24 includes a telescopic rod 2403, with abutment plates provided at the bottom of the telescopic rod 2403 and the end of its output shaft. A first mounting seat 2401 is provided on the shaft 21, and a second mounting seat 2402 is provided at the top of the upper mounting plate 12 in a direction perpendicular to the first mounting seat 2401. The telescopic rod 2403 is located between the first mounting seat 2401 and the second mounting seat 2402, and a spring 2404 is provided between the two abutment plates.

[0032] Examples, such as Figure 3As shown, a flat steel grounding wire 41 is provided on the outside of the transformer body 40. The online monitoring device is placed on the ground near the flat steel grounding wire 41. A timed execution program is set in the PLC controller to intermittently start the transmission device 23. Specifically, the drive motor 2301 starts, and the shaft 21 rotates due to the interaction of the first helical gear 2302 and the second helical gear 2303. At this time, the spring tension rod 24 is in an extended and stretched state, and the arc-shaped plate 2201 at the end of the overlapping rod 22 abuts against the flat steel grounding wire 41, thus indirectly monitoring the current through the overlapping rod 22. The probe of device 30 is connected to the flat steel grounding wire 41 to collect current signals. After a preset start time, the power supply to the drive motor 2301 is disconnected, and the shaft 21 rotates in the opposite direction under the action of the spring tension rod 24, so that the overlapping rod 22 moves away from the flat steel grounding wire 41. At this time, the current monitoring device 30 completes one data acquisition. By executing the program at regular intervals, complete data can be collected to better monitor abnormal data of the transformer, which facilitates the rapid location of faults. This solves the problems of high labor costs, insufficient monitoring frequency, and easy missed detection in the existing manual monitoring method.

[0033] It should be noted that the specific model and specifications of the current monitoring device 30 and the drive motor 2301 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0034] The power supply and operating principle of the current monitoring device 30 and the drive motor 2301 are clear to those skilled in the art and will not be described in detail here.

[0035] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. An online monitoring device for grounding current of transformer core clamps, characterized in that, The device includes a mounting frame and a flat steel overlapping assembly. The mounting frame includes a lower mounting plate and an upper mounting plate, with an angle steel support column fixed between them. A first right-angle plate is provided at both ends of the upper mounting plate along its length. The flat steel overlapping assembly includes a shaft, which is positioned between two of the first right-angle plates. Several overlapping rods are spaced apart on the outside of the shaft. A transmission device is provided on the upper mounting plate to control the rotation of the shaft. A spring tension rod is provided between the shaft and the upper mounting plate. A current monitoring device is provided inside the mounting frame, and the current monitoring device is electrically connected to the overlapping rods and the transmission device.

2. The online monitoring device for grounding current of transformer core clamps according to claim 1, characterized in that, The interior of the lap joint is hollow.

3. The online monitoring device for grounding current of transformer core clamps according to claim 2, characterized in that, One end of the lap rod is fixedly disposed on the outside of the lap rod, and an anchor rod penetrating into the interior is disposed at the contact position between the lap rod and the shaft rod. The other end of the lap rod is provided with an arc-shaped plate.

4. The online monitoring device for grounding current of transformer core clamps according to claim 3, characterized in that, The current monitoring device is equipped with the same number of probes as the overlapping rods. Each probe is located inside the shaft at the anchor rod and is in contact with it.

5. The online monitoring device for grounding current of transformer core clamps according to claim 4, characterized in that, A through hole is provided on one side of the top of the upper mounting plate, through which the data cable of the probe passes through the shaft and is electrically connected to the current monitoring device.

6. The online monitoring device for grounding current of transformer core clamps according to claim 5, characterized in that, The shaft is made of insulating material, while the connecting rod and the arc-shaped plate are made of conductive metal material.

7. The online monitoring device for grounding current of transformer core clamps according to claim 6, characterized in that, The shaft is made of carbon fiber or epoxy resin, and the connecting rod and the arc plate are made of copper or aluminum.

8. The online monitoring device for grounding current of transformer core clamps according to claim 1, characterized in that, The transmission device includes a drive motor disposed at the bottom of the upper mounting plate. The output shaft of the drive motor passes through the upper mounting plate and is provided with a first helical gear at its end. A second helical gear that meshes with the first helical gear is provided on the outer side of the shaft.

9. The online monitoring device for grounding current of transformer core clamps according to claim 1, characterized in that, There are two spring tension rods, and a second right-angle plate is also provided on the shaft near the spring tension rod to enhance the rotational stability of the shaft.

10. The online monitoring device for grounding current of transformer core clamps according to claim 9, characterized in that, The spring tension rod includes a telescopic rod, and the bottom of the telescopic rod and the end of its output shaft are both provided with abutment plates. A first mounting seat is provided on the shaft, and a second mounting seat is provided on the top of the upper mounting plate in the vertical direction of the first mounting seat. The telescopic rod is disposed between the first mounting seat and the second mounting seat, and a spring is provided between the two abutment plates.

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