A mutual inductor electric leakage alarm device

Abstract

The utility model relates to mutual inductor electric leakage alarm technical field, specifically speaking is a mutual inductor electric leakage alarm device, include: mutual inductor main part, alarm main part is installed on the surface of mutual inductor main part through magnetic attraction, mounting bracket, mounting bracket fixedly connected in the base, detection component, detection component includes sliding sleeve, bimetallic strip and push rod, sliding sleeve fixedly connected in mounting bracket, bimetallic strip fixedly connected in sliding sleeve, through using this device, using heat and mechanical direct conversion, realize passive trigger, avoid the reliability problem of electronic component, be applicable to the environment of high electromagnetic interference, timely warning surrounding personnel, will not produce security risk.

Description

Technical Field

[0001] This utility model relates to the field of current transformer leakage alarm technology, and in particular to a current transformer leakage alarm device. Background Technology

[0002] A current transformer leakage current alarm device is a safety device used to monitor the insulation status and secondary circuit integrity of current transformers (CTs) and voltage transformers (PTs) in real time. It can promptly issue warnings when leakage current, secondary open circuit, or insulation degradation occurs. Its core principle is to detect abnormal current or voltage changes on the secondary side of the transformer. When the leakage current exceeds a set threshold (e.g., 30mA) or the insulation resistance falls below a safe value (e.g., 1MΩ), it triggers an audible and visual alarm or mechanical action. Mechanical leakage current alarm devices typically use a bimetallic strip or magnetic drive mechanism. The heat or magnetic field generated by the leakage current causes the mechanical structure to shift, which is then amplified by a lever to push a warning flag or strike a bell, achieving a passive alarm. Electronic solutions use Hall effect sensors to collect signals, which are analyzed by an MCU to control LED flashing and a buzzer sounding. Fault information can be transmitted wirelessly via RS-485 or LoRa. The device also integrates forced protection functions, such as short-circuit grounding of the mechanical striker or relay tripping, to prevent high-voltage breakdown hazards. Key advantages include electromagnetic interference resistance (mechanical), multi-level alarm (local + remote), and wide adaptability (-40℃~85℃ environment). Typical application scenarios cover substations, new energy power plants, and industrial power distribution systems. It can effectively prevent equipment damage or electric shock accidents caused by transformer leakage, and meets the requirements of GB / T 20840 and IEC 61869 standards.

[0003] A search of the Chinese patent "Leakage Current Alarm Device" (publication number CN213091857U) reveals that it includes a magnetic base, a power supply, and a housing. The magnetic base is fixedly installed at the bottom of the housing. Inside the housing, a circuit board and a power supply are fixedly installed. An alarm device and a warning device are fixedly installed on the outside of the housing. The power supply and the circuit board are connected by wires. The signal input terminal of the circuit board is connected to the magnetic base by wires, and the signal output terminal of the circuit board is connected to the alarm device and the warning device by wires. This utility model has a reasonable and compact structure, is easy to use, and achieves real-time leakage current detection for household appliances and mobile production equipment through the coordinated use of the magnetic base, power supply, housing, alarm device, and warning device. It is safe, reliable, portable, and easy to install, facilitating operation, eliminating waste of electrical resources, and greatly reducing the risk of electric shock and production accidents.

[0004] In existing technologies, when leakage occurs in a current transformer, the leakage generates an electromagnetic field. The electronic components in traditional leakage alarm devices are interfered with by the electromagnetic field, causing the electronic components to malfunction. At this time, the alarm device cannot sound an alarm and cannot promptly warn people in the vicinity, which poses a certain safety hazard. Utility Model Content

[0005] The purpose of this utility model is to provide a current transformer leakage alarm device to solve the above-mentioned problems. When leakage occurs in the current transformer, the leakage generates an electromagnetic field. The electronic components in the traditional leakage alarm device are interfered with by the electromagnetic field, and the electronic components may fail. At this time, the alarm device cannot sound an alarm and cannot promptly warn the surrounding personnel, which poses a certain safety hazard.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a current transformer leakage alarm device, comprising: Current transformer body; The alarm body is magnetically attached to the surface of the current transformer body. Mounting bracket, which is fixedly connected to the base; The detection assembly includes a sliding sleeve, a bimetallic strip, and a push rod. The sliding sleeve is fixedly connected to the mounting bracket, the bimetallic strip is fixedly connected to the sliding sleeve, the bimetallic strip is connected to the secondary circuit of the transformer body, and the push rod is slidably connected to the sliding sleeve. An amplification assembly, comprising an insulating frame and a lever, wherein the insulating frame is fixedly connected to the lower inner wall of the transformer body, and the lever is rotatably connected to the insulating frame via a rotating shaft, and the lever is located on the lower side of the push rod; A signal transmission component, which connects the amplification component and the alarm body.

[0007] Preferably, the length ratio of the two sides of the lever's pivot is 4:1.

[0008] Preferably, the signal transmission component includes a first contact block, a Z-shaped plate, and a second contact block. The Z-shaped plate is fixedly connected to the lower inner wall of the transformer body. The first contact block is fixedly connected to the surface of the lever and is connected to the alarm body. The second contact block is fixedly connected to the surface of the Z-shaped plate and is connected to the alarm body. The second contact block matches the first contact block.

[0009] Preferably, the surface of the alarm body is provided with multiple sets of mounting components. Each set of mounting components includes a rotating base, a rotating block, a mounting plate, and mounting holes. Multiple mounting holes are provided. The rotating base is fixedly connected to the surface of the alarm body. The rotating block is rotatably connected to the rotating base. The mounting plate is rotatably connected to one end of the rotating block. Multiple mounting holes are opened on the surface of the mounting plate.

[0010] Preferably, each of the plurality of rotating seats is threadedly connected to a screw.

[0011] Preferably, a base is fixedly connected to the lower end of the transformer body.

[0012] Preferably, the push rod will not move downward from the sliding sleeve when not subjected to the thrust of the bimetallic strip.

[0013] The beneficial effects of this utility model are: 1. In this solution, by using this device, passive triggering is achieved through direct conversion of heat and mechanics, avoiding reliability issues of electronic components. It is suitable for environments with high electromagnetic interference, promptly alerts surrounding personnel, and does not pose any safety hazards.

[0014] 2. In this solution, multiple sets of mounting components work together to make the alarm body suitable for various shapes of current transformers. For rectangular current transformers, rotate the mounting plate until it fits against the surface of the current transformer, and then use screws to connect to the current transformer through the mounting holes. Attached Figure Description

[0015] Figure 1 This is a first-view perspective perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This utility model Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a second-view perspective perspective view of the present invention; Figure 5 This utility model Figure 4 A magnified view of a section at point B in the middle.

[0016] In the diagram: 1. Base; 2. Current transformer body; 3. Alarm body; 4. Mounting bracket; 5. Sliding sleeve; 6. Bimetallic strip; 7. Push rod; 8. Lever; 9. Insulating frame; 10. First contact block; 11. Z-shaped plate; 12. Second contact block; 13. Screw; 14. Rotating block; 15. Mounting plate; 16. Mounting hole; 17. Rotating seat. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In practical implementation: such as Figures 1-5 As shown, a current transformer leakage alarm device includes: Mutual transformer body 2; The alarm body 3 is magnetically attached to the surface of the current transformer body 2. Mounting bracket 4 is fixedly connected to the base 1; The detection assembly includes a sliding sleeve 5, a bimetallic strip 6, and a push rod 7. The sliding sleeve 5 is fixedly connected to the mounting bracket 4, the bimetallic strip 6 is fixedly connected to the sliding sleeve 5, the bimetallic strip 6 is connected to the secondary circuit of the transformer body 2, and the push rod 7 is slidably connected to the sliding sleeve 5. The amplification assembly includes an insulating frame 9 and a lever 8. The insulating frame 9 is fixedly connected to the lower inner wall of the transformer body 2, and the lever 8 is rotatably connected to the insulating frame 9 through a rotating shaft. The lever 8 is located on the lower side of the push rod 7. The signal transmission component connects the amplification component and the alarm body 3.

[0019] In this embodiment: a magnet is fixedly connected inside the alarm body 3, and is magnetically installed on the surface of the transformer body 2. The mounting bracket 4 is fixedly connected inside the base 1. The lower side of the mounting bracket 4 is used to install the detection component, the amplification component, and the signal transmission component. The bimetallic strip 6 is connected to the secondary circuit. When the transformer body 2 generates leakage current, the abnormal current causes the bimetallic strip 6 to heat up. The bimetallic strip 6 is composed of a copper-steel composite sheet. When the bimetallic strip 6 bends, it pushes the push rod 7 to move downward in the sliding sleeve 5. The push rod 7 drives the amplification component to operate. 7. Pushing lever 8 to rotate around the pivot, lever 8 tilts up on the side near the signal transmission component, causing the first contact block 10 to connect with the second contact block 12. When the first contact block 10 and the second contact block 12 are connected, a circuit is formed, and the alarm body 3 starts to operate. The alarm body 3 generates a buzzer signal to remind people that the transformer is leaking electricity and needs to be maintained in time. By using this device, the heat engine is directly converted to achieve passive triggering, avoiding the reliability problems of electronic components. It is suitable for environments with high electromagnetic interference, and can promptly warn people around without causing safety hazards.

[0020] like Figures 1-5 As shown, the length ratio of the two sides of the pivot of lever 8 is 4:1.

[0021] In this embodiment, the length ratio of the two sides of the pivot of the lever 8 is 4:1. The lever 8 is pushed to rotate around the pivot by the push rod 7, so that the first contact block 10 is connected to the second contact block 12.

[0022] like Figures 1-5 As shown, the signal transmission assembly includes a first contact block 10, a Z-shaped plate 11, and a second contact block 12. The Z-shaped plate 11 is fixedly connected to the lower inner wall of the transformer body 2. The first contact block 10 is fixedly connected to the surface of the lever 8 and is connected to the alarm body 3. The second contact block 12 is fixedly connected to the surface of the Z-shaped plate 11 and is connected to the alarm body 3. The second contact block 12 matches the first contact block 10.

[0023] In this embodiment: the first contact block 10 and the second contact block 12 in the transmission component are both connected to the alarm body 3. When the first contact block 10 and the second contact block 12 are connected, a passage is formed in the alarm body 3, and the buzzer alarm in the alarm body 3 starts to run and generates a buzzer alarm signal. The second contact block 12 is fixedly connected to the lower inner wall of the transformer body 2. The second contact block 12 is used to install the Z-shaped plate 11. When the lever 8 drives the first contact block 10 to rotate, the first contact block 10 and the second contact block 12 come into contact.

[0024] like Figures 1-5 As shown, the surface of the alarm body 3 is provided with multiple sets of mounting components. Each set of mounting components includes a rotating seat 17, a rotating block 14, a mounting plate 15, and mounting holes 16. Multiple mounting holes 16 are provided. The rotating seat 17 is fixedly connected to the surface of the alarm body 3. The rotating block 14 is rotatably connected to the rotating seat 17. The mounting plate 15 is rotatably connected to one end of the rotating block 14. Multiple mounting holes 16 are opened on the surface of the mounting plate 15.

[0025] In this embodiment: multiple sets of mounting components work together to make the alarm body 3 suitable for various shapes of current transformers. For rectangular current transformers, the mounting plate 15 is rotated to fit against the surface of the current transformer, and then screws are used to connect to the current transformer through the mounting hole 16.

[0026] like Figures 1-5 As shown, each of the multiple rotating seats 17 is threadedly connected to a screw 13.

[0027] In this embodiment, the threaded connection facilitates the positioning of the rotating block 14 and improves the stability of the connection between the mounting plate 15 and the transformer.

[0028] like Figures 1-5 As shown, the lower end of the transformer body 2 is fixedly connected to the base 1.

[0029] In this embodiment, the base 1 serves to support the main body 2 of the current transformer.

[0030] like Figures 1-5 As shown, the push rod 7 will not move downward from the sliding sleeve 5 when it is not pushed by the bimetallic strip 6.

[0031] In this embodiment, the push rod 7 will not move downward from the sliding sleeve 5 when it is not pushed by the bimetallic strip 6. The bimetallic strip 6 has undergone aging tests to ensure its lifespan.

[0032] It should be noted that the alarm body 3, the first contact block 10 and the second contact block 12 used in this solution are existing technologies. The specific model of the alarm body 3, the first contact block 10 and the second contact block 12 can be selected according to actual needs, and will not be elaborated on here.

[0033] In use, the device is first adjusted by adjusting the mounting plate 15 on the surface of the alarm body 3 to a position that facilitates installation when rotated. Screws are then passed through the mounting holes 16 to connect to the current transformer, and the alarm body 3 is installed on the surface of the current transformer body 2. When leakage occurs in the current transformer, the abnormal current causes the bimetallic strip 6 to heat up. The bimetallic strip 6, composed of a copper-steel composite sheet, bends, pushing the push rod 7 downwards within the sliding sleeve 5. The push rod 7 drives the amplification component to operate. The movable lever 8 rotates on a pivot, causing the side of the lever 8 closest to the signal transmission component to tilt upwards, connecting the first contact block 10 with the second contact block 12. When the first contact block 10 and the second contact block 12 are connected, a circuit is formed, and the alarm body 3 starts to operate. The alarm body 3 generates a buzzer signal to remind people that the current transformer is leaking electricity and needs timely maintenance. By using this device, heat and mechanical direct conversion is used to achieve passive triggering, avoiding the reliability problems of electronic components. It is suitable for environments with high electromagnetic interference, promptly alerting surrounding personnel without causing safety hazards.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A current transformer leakage alarm device, characterized in that, include: Mutual transformer body (2); The alarm body (3) is magnetically attached to the surface of the transformer body (2); Mounting bracket (4), which is fixedly connected to the base (1); The detection assembly includes a sliding sleeve (5), a bimetallic strip (6), and a push rod (7). The sliding sleeve (5) is fixedly connected to the mounting bracket (4), the bimetallic strip (6) is fixedly connected to the sliding sleeve (5), the bimetallic strip (6) is connected to the secondary circuit of the transformer body (2), and the push rod (7) is slidably connected to the sliding sleeve (5). The amplification component includes an insulating frame (9) and a lever (8). The insulating frame (9) is fixedly connected to the lower inner wall of the transformer body (2). The lever (8) is rotatably connected to the insulating frame (9) through a rotating shaft. The lever (8) is located on the lower side of the push rod (7). A signal transmission component, which is connected to the amplification component and the alarm body (3).

2. The current transformer leakage alarm device according to claim 1, characterized in that: The ratio of the lengths on both sides of the pivot of the lever (8) is 4:

1.

3. The current transformer leakage alarm device according to claim 1, characterized in that: The signal transmission component includes a first contact block (10), a Z-shaped plate (11), and a second contact block (12). The Z-shaped plate (11) is fixedly connected to the lower inner wall of the transformer body (2). The first contact block (10) is fixedly connected to the surface of the lever (8). The first contact block (10) is connected to the alarm body (3). The second contact block (12) is fixedly connected to the surface of the Z-shaped plate (11). The second contact block (12) is connected to the alarm body (3). The second contact block (12) matches the first contact block (10).

4. The current transformer leakage alarm device according to claim 1, characterized in that: The surface of the alarm body (3) is provided with multiple sets of mounting components. Each set of mounting components includes a rotating seat (17), a rotating block (14), a mounting plate (15), and mounting holes (16). Multiple mounting holes (16) are provided. The rotating seat (17) is fixedly connected to the surface of the alarm body (3). The rotating block (14) is rotatably connected to the rotating seat (17). The mounting plate (15) is rotatably connected to one end of the rotating block (14). Multiple mounting holes (16) are opened on the surface of the mounting plate (15).

5. A current transformer leakage alarm device according to claim 4, characterized in that: Each of the aforementioned rotating seats (17) is threaded with a screw (13).

6. The current transformer leakage alarm device according to claim 1, characterized in that: The lower end of the transformer body (2) is fixedly connected to a base (1).

7. A current transformer leakage alarm device according to claim 1, characterized in that: The push rod (7) will not move downward from the sliding sleeve (5) when it is not pushed by the bimetallic strip (6).

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