Convenient oil-immersed mutual inductor oil level window structure
By combining oil level floats and millimeter-wave radar sensors in oil-immersed instrument transformers, the problem of difficult oil level monitoring has been solved, enabling accurate oil level monitoring and effective early warning, thus ensuring the safe operation of the transformer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA POWER (GRP) CO LTD XUEJIAWAN POWER SUPPLY BUREAU
- Filing Date
- 2025-09-23
- Publication Date
- 2026-07-21
AI Technical Summary
The lack of effective online monitoring methods for existing oil-immersed instrument transformers makes oil level monitoring difficult, makes it impossible to accurately judge oil level changes, results in poor early warning effects, and affects the safe operation of transformers.
The monitoring method combines an oil level float and a millimeter-wave radar sensor. The oil level is determined by the floating of the oil level float, and the position of the top of the expander is detected by the float position sensing component and the millimeter-wave radar sensor, so as to achieve accurate oil level monitoring and early warning.
This achieves accurate oil level monitoring and effective early warning, reduces the error in oil level judgment caused by temperature changes, and ensures the safe operation of the transformer.
Smart Images
Figure CN224535197U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of oil-immersed instrument transformers, and in particular relates to a convenient oil level window structure for oil-immersed instrument transformers. Background Technology
[0002] As a crucial component of transformers, the reliability of oil-immersed current transformers directly impacts their safe operation. Due to the unique structure of oil-immersed current transformers, there are currently almost no effective live-line detection or online monitoring methods. If simple and effective online monitoring methods could be adopted to detect defects before a fault occurs and take effective measures, major accidents could be avoided. In particular, the oil level plays a critical role in internal heat dissipation and component protection. Oil level monitoring is relatively difficult because the oil level changes with temperature, and it also decreases due to oil evaporation or condensation into gas, making monitoring challenging. Utility Model Content
[0003] The purpose of this invention is to provide a convenient oil level window structure for an oil-immersed instrument transformer. The oil level is represented by an oil level float that floats on the oil surface. The position of the oil level float can be monitored by a float position sensing component to determine the oil level. A millimeter-wave radar sensor can detect the position of the top of the expander to adjust the warning value. This solves the problems of existing oil-immersed instrument transformers, such as troublesome oil level monitoring, inaccurate oil level monitoring, and poor warning effect.
[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0005] This utility model discloses a convenient oil level viewing window structure for an oil-immersed instrument transformer, comprising a display control box, a monitoring tube, an oil level float, and a millimeter-wave radar sensor. A display screen is mounted on the side wall of the display control box. A monitor and a power supply battery are installed inside the display control box. A float position sensing component is installed inside the monitoring tube. The oil level float is movably sleeved on the outer wall of the monitoring tube. A millimeter-wave radar sensor is mounted on the upper half of the side wall of the monitoring tube. The top of the monitoring tube is inserted into the display control box. The portion of the monitoring tube below and at the position of the millimeter-wave radar sensor is installed inside the oil-immersed instrument transformer. The display control box is installed outside the top of the oil-immersed instrument transformer. The monitoring tube is sealed through the top wall of the oil-immersed instrument transformer. The millimeter-wave radar sensor is located above the expansion tank. The monitor is electrically connected to the display screen, the float position sensing component, and the millimeter-wave radar sensor. An alarm module is installed inside the monitor.
[0006] The present invention is further configured such that the float position sensing component includes a mounting rod, a mounting frame, and a sensing unit. The top of the mounting rod is movably mounted inside the top of the monitoring tube, and the bottom of the mounting rod is fixed with a mounting frame. The mounting frame includes two circular plates, a connecting rod connecting the edges of the two circular plates, and limiting posts provided on the inner sides of the two circular plates. The sensing unit includes a double-sided pressure sensor, a pressure plate, a pressure spring, and a magnet. A pressure plate is attached to each of the two sides of the double-sided pressure sensor. One end of the pressure spring is fixed to the pressure plate, and the other end is fixed with a magnet. The double-sided pressure sensor is fixed in the middle of the connecting rod, and the two magnets are movably sleeved on the corresponding limiting posts.
[0007] The oil level float includes a foam float and a ring magnet, with the ring magnet embedded in the upper half of the foam float.
[0008] The present invention is further configured such that a mounting post is fixedly inserted into the top of the monitoring tube, a motor slot is provided at the top of the mounting post, a square through hole is provided below the motor slot, a square rod is fixedly attached to the top of the mounting rod, the square rod is movably inserted into the square through hole, a height adjustment motor is installed in the motor slot, and a lead screw is connected to the shaft of the height adjustment motor, with the lead screw spirally inserted from the top of the square rod.
[0009] The present invention is further configured such that the double-sided pressure sensor is located at the top of the expander, and when the expander deforms, the height adjustment motor adjusts the position of the double-sided pressure sensor by adjusting the height of the mounting rod.
[0010] The present invention is further configured such that the alarm module includes an alarm indicator light, an alarm horn, and an oil level indicator. The alarm indicator light includes red, yellow, and blue indicator lights, which are embedded in the side wall of the display control box next to the display screen. The display screen displays the oil level height.
[0011] The present invention is further configured such that the display control box is equipped with a wireless module, the wireless module is electrically connected to the monitor, and the wireless module performs wireless data transmission with the back-end center.
[0012] The present invention is further configured such that a wind power generation device is installed on the top cover of the display control box, and the wind power generation device charges the storage battery.
[0013] This utility model has the following beneficial effects:
[0014] 1. This utility model encloses the sensor in the monitoring tube. The position of the oil level float is determined by the influence of the float position sensing component on the floating of the oil level float. The float position sensing component is equipped with a magnetic sheet, and the oil level float is equipped with a ring magnet. The displacement of the ring magnet will generate different pushing or attracting forces on the magnetic sheet, resulting in different pressures generated by the double-sided pressure sensor. The pressure value reflects the position of the oil level, thereby providing an early warning of the oil level position. The judgment error will not increase due to changes in temperature or oil level.
[0015] 2. This utility model sets a warning value by detecting the height position of the top of the expander, making the monitoring of oil level more accurate and effective.
[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of a convenient oil level viewing window structure for an oil-immersed instrument transformer.
[0019] Figure 2 This is an exploded structural diagram of a convenient oil level viewing window structure for an oil-immersed instrument transformer.
[0020] Figure 3 This is a structural diagram of the mounting rod and mounting bracket.
[0021] Figure 4 This is a schematic diagram of the sensing unit.
[0022] Figure 5 This is a structural diagram of the mounting column.
[0023] The attached diagram lists the components represented by each number as follows:
[0024] 1. Display control box; 2. Display screen; 3. Wind power generation device; 4. Millimeter-wave radar sensor; 5. Foam float; 51. Ring magnet; 7. Monitoring tube; 8. Mounting rod; 81. Mounting bracket; 811. Circular plate; 812. Connecting rod; 813. Limiting post; 9. Sensing unit; 91. Double-sided pressure sensor; 911. Pressure plate; 92. Pressure spring; 93. Magnet piece; 10. Mounting post; 100. Height adjustment motor; 101. Motor slot; 102. Square through hole. Detailed Implementation
[0025] 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 skilled in the art without creative effort are within the protection scope of the present utility model.
[0026] Please see Figure 1-5 This utility model relates to a convenient oil level viewing window structure for an oil-immersed instrument transformer, comprising a display control box 1, a monitoring tube 7, an oil level float, and a millimeter-wave radar sensor 4. A display screen 2 is mounted on the side wall of the display control box 1. A monitor and a power supply battery are installed inside the display control box 1. A float position sensing component is installed inside the monitoring tube 7. The oil level float is movably sleeved on the outer wall of the monitoring tube 7. The millimeter-wave radar sensor 4 is mounted on the upper half of the side wall of the monitoring tube 7. The top of the monitoring tube 7 is inserted into the display control box 1. The portion of the monitoring tube 7 below and at the position of the millimeter-wave radar sensor 4 is installed inside the oil-immersed instrument transformer. The display control box 1 is installed outside the top of the oil-immersed instrument transformer. The monitoring tube 7 is sealed through the top wall of the oil-immersed instrument transformer. The millimeter-wave radar sensor 4 is located above the expansion tank. The monitor is electrically connected to the display screen 2, the float position sensing component, and the millimeter-wave radar sensor 4. An alarm module is installed inside the monitor.
[0027] The above structure is installed on top of the oil-immersed transformer. The monitoring tube 7 is set close to the inner wall of the oil-immersed transformer (but does not affect the floating of the oil level float). The display screen can show the oil level position (instead of the traditional window observation). During installation, the monitoring tube 7 passes through the top cover of the oil-immersed transformer and is sealed on both sides of the top cover with seals. The millimeter-wave radar sensor 4 is installed on the side wall of the monitoring tube 7 through a horizontal mounting rod, and the millimeter-wave radar sensor 4 is facing downward above the expander. The wave emitted by the millimeter-wave radar sensor 4 detects the height of the top of the expander. The warning is given by monitoring the oil level. When the oil level is above the expander, it is a safe oil level. When it is close to or below the top position of the expander, an alarm will be issued. The lower the liquid level, the higher the alarm level.
[0028] The position of the oil level float is determined by the influence of the float position sensing component on the float position sensing component. The float position sensing component is equipped with a magnetic piece 93, and the oil level float is equipped with a ring magnet 51. The displacement of the ring magnet 51 will generate different pushing or attracting forces on the magnetic piece 93, resulting in different pressures generated by the double-sided pressure sensor 91. The pressure value reflects the position of the oil level, thereby providing an early warning of the oil level position. The judgment error will not increase due to changes in temperature or oil level.
[0029] Oil-immersed instrument transformers are equipped with automatic pressure relief valves to release oil and gas and relieve pressure.
[0030] The floating block position sensing component includes a mounting rod 8, a mounting frame 81, and a sensing unit 9. The top of the mounting rod 8 is movably mounted inside the top of the monitoring tube 7, and the bottom of the mounting rod 8 is fixed with the mounting frame 81. The mounting frame 81 includes two circular plates 811, a connecting rod 812 connecting the edges of the two circular plates 811, and limiting posts 813 provided on the inner sides of the two circular plates 811. The sensing unit 9 includes a double-sided pressure sensor 91, a pressure plate 911, a pressure spring 92, and a magnet 93. The double-sided pressure sensor 91 has a pressure plate 911 attached to each of its two sides. One end of the pressure spring 92 is fixed to the pressure plate 911, and the other end is fixed with a magnet 93. The double-sided pressure sensor 91 is fixed in the middle of the connecting rod 812, and the two magnets 93 are movably sleeved on the corresponding limiting posts 813.
[0031] The oil level float includes a foam float 5 and an annular magnet 51, with the annular magnet 51 embedded in the upper half of the foam float 5.
[0032] As the annular magnet 51 moves downward, it gradually exerts downward pressure on the upper magnet 93. As the pressure increases, the pressure spring 92 deforms, and the pressure value monitored by the pressure sensor above the double-sided pressure sensor 91 increases. When the annular magnet 51 approaches the upper magnet 93, it reaches its maximum pressure value, which is close to the warning value. Further downward movement removes the downward pressure on the upper magnet 93, creating an upward thrust and a downward thrust on the lower magnet 93. At this point, the pressure values of both sensors are essentially zero. Continuing downward, when the lower double-sided pressure sensor 91 registers a high pressure value, the surface oil level begins to drop below the top of the expander. The lower the pressure, the lower the oil level, and the higher the alarm level.
[0033] The monitoring tube 7 has a fixed mounting post 10 at its top. The mounting post 10 has a motor slot 101 at its top and a square through hole 102 below the motor slot 101. The mounting rod 8 has a square rod 82 fixed at its top and is movably inserted into the square through hole 102. A height adjustment motor 100 is installed in the motor slot 101. A lead screw is connected to the shaft of the height adjustment motor 100 and the lead screw is inserted into the top of the square rod 82.
[0034] Since the expander changes with temperature, the height of the motor 100 is adjusted to finely adjust the mounting rod 8 (i.e., the height of the mounting bracket 81) to match the height of the double-sided pressure sensor 91 with the top position of the expander for early warning. In this way, the oil level height is matched with the expander height for early warning.
[0035] The double-sided pressure sensor 91 is located at the top of the expander. When the expander deforms, the height adjustment motor 100 adjusts the position of the double-sided pressure sensor 91 by adjusting the height of the mounting rod 8.
[0036] The alarm module includes an alarm indicator light, an alarm horn, and an oil level indicator. The alarm indicator light includes red, yellow, and blue indicator lights, which are embedded in the side wall of the display control box 1 next to the display screen 2. The display screen 2 displays the oil level.
[0037] The oil level indicator displays the approximate oil level on the screen (which only displays text). A red light indicates that the oil level is below the top of the expander, a yellow light indicates that the oil level is close to the top of the expander, and a green light indicates that the oil level is high enough.
[0038] The display control box 1 is equipped with a wireless module, which is electrically connected to the monitor and performs wireless data transmission with the back-end center.
[0039] Warning information is transmitted wirelessly so that the backend can detect and handle the warnings promptly.
[0040] A wind power generation device 3 is installed on the top cover of the display control box 1, and the wind power generation device 3 charges the battery. By supplementing electrical energy with wind power, and installing outdoors, wind power generation is set up to generate micro-power and slowly supplement electrical energy.
[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A convenient oil level viewing window structure for an oil-immersed instrument transformer, characterized in that: The system includes a display control box (1), a monitoring tube (7), an oil level float, and a millimeter-wave radar sensor (4). A display screen (2) is installed on the side wall of the display control box (1). A monitor and a power supply battery are installed inside the display control box (1). A float position sensing component is installed inside the monitoring tube (7). The oil level float is movably sleeved on the outer wall of the monitoring tube (7). A millimeter-wave radar sensor (4) is installed on the upper half of the side wall of the monitoring tube (7). The top of the monitoring tube (7) is inserted into the display control box (1). The monitoring tube (7) at the position of the millimeter-wave radar sensor (4) and below that position are installed inside the oil-immersed transformer. The display control box (1) is installed outside the top of the oil-immersed transformer. The monitoring tube (7) is sealed through the top wall of the oil-immersed transformer. The millimeter-wave radar sensor (4) is located above the expander. The monitor is electrically connected to the display screen (2), the float position sensing component, and the millimeter-wave radar sensor (4). An alarm module is installed inside the monitor.
2. The convenient oil level viewing window structure for an oil-immersed instrument transformer according to claim 1, characterized in that, The floating block position sensing component includes a mounting rod (8), a mounting frame (81), and a sensing unit (9). The top of the mounting rod (8) is movably installed inside the top of the monitoring tube (7). The bottom of the mounting rod (8) is fixed with a mounting frame (81). The mounting frame (81) includes two circular plates (811), a connecting rod (812) connecting the edges of the two circular plates (811), and a limiting post (813) provided on the inner side of the two circular plates (811). The sensing unit (9) includes a double-sided pressure sensor (91), a pressure plate (911), a pressure spring (92), and a magnet (93). The double-sided pressure sensor (91) has a pressure plate (911) attached to each of its two sides. One end of the pressure spring (92) is fixed on the pressure plate (911), and the other end is fixed with a magnet (93). The double-sided pressure sensor (91) is fixed in the middle position of the connecting rod (812), and the two magnets (93) are movably sleeved on the corresponding limiting post (813). The oil level float includes a foam float (5) and an annular magnet (51), with the annular magnet (51) embedded in the upper half of the foam float (5).
3. The convenient oil level viewing window structure for an oil-immersed instrument transformer according to claim 2, characterized in that, The monitoring tube (7) has a fixed plug at the top of the mounting post (10). The top of the mounting post (10) is provided with a motor slot (101). A square through hole (102) is provided below the motor slot (101). A square rod (82) is fixed at the top of the mounting rod (8). The square rod (82) is movably inserted into the square through hole (102). A height adjustment motor (100) is installed in the motor slot (101). A lead screw is connected to the shaft of the height adjustment motor (100), and the lead screw is inserted into the top of the square rod (82) by a screw.
4. The convenient oil level window structure for an oil-immersed instrument transformer according to claim 3, characterized in that, The double-sided pressure sensor (91) is located at the top of the expander. When the expander deforms, the height adjustment motor (100) adjusts the position of the double-sided pressure sensor (91) by adjusting the height of the mounting rod (8).
5. The convenient oil level window structure for an oil-immersed instrument transformer according to claim 1, characterized in that, The alarm module includes an alarm indicator light, an alarm horn, and an oil level indicator. The alarm indicator light includes red, yellow, and blue indicator lights. The indicator lights are embedded in the side wall of the display control box (1) next to the display screen (2). The display screen (2) displays the oil level.
6. The convenient oil level viewing window structure for an oil-immersed instrument transformer according to claim 1, characterized in that, The display control box (1) is equipped with a wireless module, which is electrically connected to the monitor and performs wireless data transmission with the back-end center.
7. The convenient oil level viewing window structure for an oil-immersed instrument transformer according to claim 1, characterized in that, A wind power generation device (3) is installed on the top cover of the display control box (1), and the wind power generation device (3) charges the storage battery.