Iron core grounding current on-line monitoring device

Abstract

The utility model discloses an on-line monitoring device for grounding current of an iron core. The on-line monitoring device comprises a monitoring shell, a current monitoring mechanism and a real-time monitoring mechanism. The current monitoring mechanism is arranged on one side of the monitoring shell and comprises an iron core grounding current sensor, the lower portion of the iron core grounding current sensor is in threaded connection with multiple sets of locking bolt pieces, and a communication connecting line is connected between the iron core grounding current sensor and the monitoring shell. The real-time monitoring mechanism is arranged in the monitoring shell and comprises a liquid crystal screen, multiple sets of indicator lamps are arranged on one side of the liquid crystal screen, a bottom plate is arranged in the liquid crystal screen, and a CPU board is installed on the bottom plate. According to the utility model, the iron core grounding current sensor is arranged to carry out real-time on-line monitoring on the grounding current of the iron core of the transformer, thereby reducing the adverse effects of the shape and size of the grounding bar of the iron core of the transformer on current monitoring, and improving the accuracy and reliability of monitoring the grounding current of the iron core.

Description

Technical Field

[0001] This utility model belongs to the field of transformer core grounding current monitoring technology, specifically relating to an online monitoring device for transformer core grounding current. Background Technology

[0002] With the continuous progress of society and the development of urbanization, reliable power supply has become a basic condition for the stable operation of cities. As the "heart" of the power supply system, the transformer plays a vital role in the stable operation of the power supply system.

[0003] As is well known, power transformers typically consist of a core, windings, leads, protective sleeves, voltage regulating devices, and cooling systems. During normal operation, an electric field exists around the windings, and the core and other metal components are situated within this field. If the core is not reliably grounded, a discharge phenomenon will occur, damaging the insulation. Therefore, the core of a power transformer must have at least one reliable grounding point. However, in practical applications, the core may experience multiple grounding points due to factors such as tiny metal wires within the transformer tank, metal powder from bearing wear, welding slag, and core structural deformation. When multiple grounding points occur, circulating currents will form on the normally grounded leads. These circulating currents can cause localized short circuits and overheating in the core, potentially leading to burnout. Furthermore, they can cause localized overheating of the transformer itself, which may also result in discharge faults.

[0004] When a transformer is energized, a current loop will not form inside the core, so the grounding current is very small, generally within tens of mA. When multiple grounding points occur in the core, it is equivalent to a short-circuit turn around the main magnetic flux of the core. The current on the grounding wire will increase significantly. The magnitude of the circulating current depends on the relative position of the fault point and the normal grounding point. Therefore, by measuring the current in the lead wire of the transformer core, it is possible to effectively determine whether there is a multi-point grounding phenomenon in the transformer core.

[0005] In existing technologies, core grounding current testers are mainly used to monitor core grounding current. These devices use clamp-on ammeters to detect the current in the transformer core grounding busbar. However, these devices cannot monitor core grounding current in real time. Furthermore, the current monitoring process is easily affected by the shape and size of the transformer core grounding busbar, resulting in significant monitoring errors. Consequently, the accuracy and reliability of core grounding current monitoring are poor.

[0006] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide an online monitoring device for iron core grounding current. Utility Model Content

[0007] The purpose of this invention is to provide an online monitoring device for iron core grounding current, so as to solve the problem that the traditional iron core grounding current tester cannot monitor the iron core grounding current in real time.

[0008] To achieve the above objectives, the technical solution provided by an embodiment of this utility model is as follows:

[0009] An online monitoring device for iron core grounding current includes: a monitoring housing, a current monitoring mechanism, and a real-time monitoring mechanism.

[0010] The current monitoring mechanism is located on one side of the monitoring housing. The current monitoring mechanism includes an iron core grounding current sensor. Multiple sets of locking bolts are threadedly connected to the lower part of the iron core grounding current sensor. A communication connection line is connected between the iron core grounding current sensor and the monitoring housing.

[0011] The real-time monitoring mechanism is located inside the monitoring housing. The real-time monitoring mechanism includes an LCD screen, and multiple indicator lights are provided on one side of the LCD screen.

[0012] Furthermore, the LCD screen includes a base plate, facilitating the assembly and fixation of the CPU board. The CPU board is mounted on the base plate, and the communication cable, LCD screen, and indicator lights are all communicatively connected to the CPU board. This communication connection between the CPU board and the communication cable, LCD screen, and indicator lights enables real-time display of monitoring data from the core grounding current sensor, improving the real-time performance of monitoring the grounding current of the transformer core grounding busbar.

[0013] Furthermore, a liquid crystal display (LCD) screen mounting plate is connected to one side of the LCD screen located inside the monitoring housing. The mounting plate serves to fix and limit the movement of the LCD screen. Similarly, an indicator light mounting plate is connected to one side of the indicator light located inside the monitoring housing. Both the LCD screen mounting plate and the indicator light mounting plate are fixedly connected to the monitoring housing. The indicator light mounting plate serves to assemble and secure the indicator light.

[0014] Furthermore, a sensor signal interface is connected to the side of the monitoring housing away from the LCD screen, and this sensor signal interface is compatible with the communication cable. The connection between the sensor signal interface and the communication cable allows the core grounding current sensor to communicate with the CPU board. A power interface is located on one side of the sensor signal interface. This power interface connects the monitoring housing to an external power source.

[0015] Furthermore, a liquid crystal display (LCD) program maintenance interface is connected to the side of the monitoring housing furthest from the LCD screen, and this interface is compatible with the LCD screen. Communication with the LCD screen is established through this interface, facilitating program maintenance and adjustment of the LCD screen.

[0016] Furthermore, a CPU board program maintenance interface is provided below the LCD program maintenance interface, and the CPU board program maintenance interface is compatible with the CPU board. Communication and program adjustment are performed on the CPU board through the CPU board program maintenance interface.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention uses a core grounding current sensor to monitor the transformer core grounding current in real time, reducing the adverse effects of the shape and size of the transformer core grounding busbar on current monitoring and improving the accuracy and reliability of core grounding current monitoring. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an assembly diagram of an online monitoring device for iron core grounding current in one embodiment of the present invention;

[0021] Figure 2 This is a side view of an online monitoring device for iron core grounding current according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure at point A in the middle;

[0023] Figure 4 This is a front view of the real-time monitoring mechanism in one embodiment of the present invention;

[0024] Figure 5 This is a rear view of the real-time monitoring mechanism in one embodiment of the present invention;

[0025] Figure 6 This is a top sectional view of the real-time monitoring mechanism in one embodiment of the present invention;

[0026] Figure 7 This is a first side sectional view of the real-time monitoring mechanism in one embodiment of the present invention;

[0027] Figure 8 This is a partial structural diagram of the real-time monitoring mechanism in one embodiment of the present invention.

[0028] In the figure: 1. Monitoring housing, 2. Current monitoring mechanism, 201. Core grounding current sensor, 202. Locking bolt part, 203. Communication connection line, 3. Real-time monitoring mechanism, 301. Liquid crystal display screen, 302. Indicator light, 303. Base plate, 304. CPU board, 305. Liquid crystal display screen fixing plate, 306. Indicator light fixing plate, 307. Sensor signal interface, 308. Power supply interface, 309. Liquid crystal display program maintenance interface, 310. CPU board program maintenance interface. Specific embodiments

[0029] The present invention will be described in detail below in conjunction with the various embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, methodical or functional changes made by those of ordinary skill in the art based on these embodiments are included within the protection scope of the present invention.

[0030] The present invention discloses an on-line monitoring device for core grounding current. Refer Figures 1-8 as shown, it includes: a monitoring housing 1, a current monitoring mechanism 2, and a real-time monitoring mechanism 3.

[0031] Specifically, the material of the monitoring housing 1 is aluminum.

[0032] Refer Figures 1-3 as shown, the current monitoring mechanism 2 is arranged on one side of the monitoring housing 1, and the current monitoring mechanism 2 includes a core grounding current sensor 201. It is convenient to monitor the core grounding current in real time through the core grounding current sensor 201.

[0033] Specifically, the model of the core grounding current sensor 201 is ICGC-500, the sensitivity of the core grounding current sensor 201 is 0.1 mA, and the measurement range is 2 mA to 10 A. [[ID=,23]]

[0034] Refer Figures 1-3 as shown, multiple groups of locking bolt parts 202 are threadedly connected below the core grounding current sensor 201. The core grounding current sensor 201 is fixed on the outside of the core grounding bus by the threaded movement of multiple groups of locking bolt parts 202, which improves the stability of the core grounding current sensor 201 for current monitoring of the core grounding bus.

[0035] Refer Figures 1-3 as shown, a communication connection line 203 is connected between the core grounding current sensor 201 and the monitoring housing 1. The monitoring data of the core grounding current sensor 201 is transmitted in real time through the communication connection line 203, so as to facilitate on-line recording of the current monitoring data of the core grounding current sensor 201 and track the position of abnormal insulation points inside the transformer.

[0036] Refer Figure 1As shown in the figure, the real-time monitoring mechanism 3 is arranged inside the monitoring housing 1. The real-time monitoring mechanism 3 includes a liquid crystal display screen 301. It is convenient to display the current monitoring data of the iron core grounding current sensor 201 in real time through the liquid crystal display screen 301, so as to facilitate the judgment of whether there is a phenomenon of multi-point grounding of the transformer iron core. On one side of the liquid crystal display screen 301, there are multiple groups of indicator lights 302. The iron core grounding current sensor 201 is warned and reminded through the multiple groups of indicator lights 302.

[0037] Refer Figures 7-8 As shown in the figure, a bottom plate 303 is arranged inside the liquid crystal display screen 301. It is convenient to assemble and fix the CPU board 304 through the bottom plate 303. The CPU board 304 is installed on the bottom plate 303, and the communication connecting wire 203, the liquid crystal display screen 301 and the indicator lights 302 are all communicatively connected to the CPU board 304. The communication connecting wire 203, the liquid crystal display screen 301 and the indicator lights 302 are communicatively connected through the CPU board 304, so as to facilitate the real-time display of the monitoring data of the iron core grounding current sensor 201, and improve the real-time performance of monitoring the grounding current of the transformer iron core grounding bus.

[0038] Refer Figure 8 As shown in the figure, on one side of the liquid crystal display screen 301 located inside the monitoring housing 1, there is a liquid crystal display screen fixing plate 305 connected. The liquid crystal display screen fixing plate 305 plays a role in fixing and limiting the liquid crystal display screen 301. On one side of the indicator lights 302 located inside the monitoring housing 1, there is an indicator light fixing plate 306 connected. Both the liquid crystal display screen fixing plate 305 and the indicator light fixing plate 306 are fixedly connected to the monitoring housing 1. The indicator light fixing plate 306 plays a role in assembling and fixing the indicator lights 302.

[0039] Specifically, 301, 302, and 304 are all commercially available and can be directly purchased and used.

[0040] Refer Figure 5 As shown in the figure, on one side of the monitoring housing 1 away from the liquid crystal display screen 301, there is a sensor signal interface 307 connected. The sensor signal interface 307 is matched with the communication connecting wire 203. Through the connection between the sensor signal interface 307 and the communication connecting wire 203, the iron core grounding current sensor 201 is communicatively connected to the CPU board 304 under the action of the communication connecting wire 203 and the sensor signal interface 307. On one side of the sensor signal interface 307, there is a power interface 308. The monitoring housing 1 is connected to an external power supply through the power interface 308.

[0041] Refer Figure 5 As shown in the figure, on one side of the monitoring housing 1 away from the liquid crystal display screen 301, there is a liquid crystal display program maintenance interface 309 connected. The liquid crystal display program maintenance interface 309 is matched with the liquid crystal display screen 301. The liquid crystal display screen 301 is communicatively connected through the liquid crystal display program maintenance interface 309, so as to facilitate the program maintenance and adjustment of the liquid crystal display screen 301.

[0042] As shown Figure 5 below the liquid crystal display program maintenance interface 309, there is a CPU board program maintenance interface 310, and the CPU board program maintenance interface 310 is matched with the CPU board 304. The CPU board 304 is communicatively connected and the program is adjusted and conducted through the CPU board program maintenance interface 310.

[0043] During specific use, the iron core grounding current sensor 201 is fixedly assembled outside the iron core grounding strip by rotating multiple groups of locking bolt parts 202. The iron core grounding current sensor 201 monitors the current of the iron core grounding strip in real time. The current data monitored by the iron core grounding current sensor 201 can be transmitted into the CPU board 304 along the communication connection line 203, and through the communication connection between the CPU board 304 and the liquid crystal screen 301, the monitoring data of the iron core grounding current sensor 201 is displayed on the liquid crystal screen 301 in real time. The state of whether there is multi-point grounding of the transformer iron core is judged by monitoring the current of the iron core grounding strip in real time.

[0044] It can be seen from the above technical solutions that the present utility model has the following beneficial effects:

[0045] The present utility model monitors the grounding current of the transformer iron core in real time and online by setting the iron core grounding current sensor, reduces the adverse effects of the shape and size of the transformer iron core grounding strip on current monitoring, and improves the accuracy and reliability of monitoring the grounding current of the iron core.

[0046] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model 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 utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0047] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation manners understandable by those skilled in the art.

Claims

1. An iron core ground current on-line monitoring device, characterized by, include: Monitoring casing (1); A current monitoring mechanism (2) is located on one side of the monitoring housing (1). The current monitoring mechanism (2) includes an iron core grounding current sensor (201). Multiple sets of locking bolts (202) are threadedly connected to the lower part of the iron core grounding current sensor (201). A communication connection line (203) is connected between the iron core grounding current sensor (201) and the monitoring housing (1). A real-time monitoring mechanism (3) is located inside the monitoring housing (1). The real-time monitoring mechanism (3) includes an LCD screen (301), and multiple indicator lights (302) are provided on one side of the LCD screen (301).

2. The core ground current on-line monitoring device according to claim 1, characterized in that, The LCD screen (301) has a base plate (303) inside, and a CPU board (304) is installed on the base plate (303). The communication connection line (203), the LCD screen (301) and the indicator light (302) are all connected to the CPU board (304) for communication.

3. The core ground current on-line monitoring device according to claim 2, characterized in that, The LCD screen (301) is located inside the monitoring housing (1) and is connected to the LCD screen fixing plate (305). The indicator light (302) is located inside the monitoring housing (1) and is connected to the indicator light fixing plate (306). Both the LCD screen fixing plate (305) and the indicator light fixing plate (306) are fixedly connected to the monitoring housing (1).

4. The core ground current on-line monitoring device according to claim 3, characterized in that, The monitoring housing (1) is connected to a sensor signal interface (307) on the side away from the LCD screen (301). The sensor signal interface (307) is matched with the communication connection line (203). A power interface (308) is provided on one side of the sensor signal interface (307).

5. The core ground current on-line monitoring device according to claim 4, characterized in that, The monitoring housing (1) is connected to a liquid crystal display program maintenance interface (309) on the side away from the liquid crystal screen (301), and the liquid crystal display program maintenance interface (309) is matched with the liquid crystal screen (301).

6. The core ground current on-line monitoring device according to claim 5, characterized in that, Below the liquid crystal display program maintenance interface (309) is a CPU board program maintenance interface (310), which is matched with the CPU board (304).

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