Digital detection device for oil level of power transformer

Abstract

The invention relates to the technical field of power transformer monitoring, in particular to a power transformer oil level digital detection device which comprises a shell, an ultrasonic liquid level probe, a signal conditioning module, a microcontroller module, a communication module and a power module. A high-precision ultrasonic liquid level probe and a data fusion algorithm are adopted, the precision and reliability of oil level detection of the power transformer are remarkably improved, the requirement of a modern electric power system for refined management of the transformer can be met, and the signal quality is effectively improved through the design of a signal conditioning module; the multifunctionality of the microcontroller module enhances the stability and intelligence of the detection device, the communication module supports multiple communication protocols, remote transmission and safety monitoring of oil level data are achieved, and electric power operation and maintenance personnel can conveniently master the operation state of the transformer in time and conduct centralized management.

Description

Technical Field

[0001] The invention relates to the technical field of power transformer monitoring, and in particular to a digital detection device for oil level of a power transformer. Background Art

[0002] Power transformers are vital equipment in power systems. Their safe and stable operation is a necessary condition for reliable power supply of power grid systems. Oil level is one of the important parameters that characterize whether the transformer can operate safely and stably. Too low oil level may lead to the risk of insufficient oil in the transformer, while too high oil level may cause oil spraying accidents in the transformer. Therefore, accurate monitoring of the transformer oil level is extremely critical to the safe and stable operation of the transformer.

[0003] Traditional transformer oil level detection methods mainly rely on oil level gauges, such as glass tube oil level gauges, magnetic oil level gauges, etc. However, the measurement accuracy of these traditional oil level gauges is limited, and it is difficult to meet the requirements of modern power systems for refined management of transformers. Moreover, most of them are mechanical structures and are easily affected by environmental factors, resulting in increased measurement errors or even damage. At the same time, traditional oil level gauges cannot realize remote transmission and centralized monitoring of data, which is not conducive to power operation and maintenance personnel to timely and comprehensively grasp the operating status of the transformer. Summary of the invention

[0004] The purpose of the present invention is to solve the following shortcomings in the prior art: the traditional transformer oil level detection method mainly relies on oil level gauges, such as glass tube oil level gauges, magnetic oil level gauges, etc. However, the measurement accuracy of these traditional oil level gauges is limited, and it is difficult to meet the requirements of modern power systems for refined management of transformers. Moreover, most of them are mechanical structures and are easily affected by environmental factors, resulting in increased measurement errors or even damage. At the same time, traditional oil level gauges cannot realize remote transmission and centralized monitoring of data, which is not conducive to power operation and maintenance personnel to grasp the operating status of the transformer in a timely and comprehensive manner. A digital oil level detection device for power transformers is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A digital detection device for oil level of a power transformer, comprising a housing, an ultrasonic liquid level probe, a signal conditioning module, a microcontroller module, a communication module and a power module, wherein a plurality of U-shaped frames are fixedly installed on the top of the housing, the signal conditioning module, the microcontroller module and the communication module are respectively fixedly installed on the plurality of U-shaped frames, the signal conditioning module is electrically connected to the ultrasonic liquid level probe, the microcontroller module is electrically connected to the signal conditioning module, the communication module is electrically connected to the microcontroller module, and the power module is fixedly installed on the bottom of the housing and is used to provide a stable power supply for the entire detection device;

[0007] The microcontroller module is connected to a support rod, the top end of the support rod passes through the shell and is fixedly mounted with a liquid crystal display screen. The side wall of the shell is symmetrically provided with heat dissipation ports, and a heat dissipation component is provided in the shell. The heat dissipation component is used to discharge hot air in the shell from the heat dissipation ports.

[0008] Preferably, the heat dissipation assembly includes two rotating shafts and two rotating blades respectively fixedly sleeved on the two rotating shafts, the two rotating shafts respectively correspond to the positions of the two heat dissipation ports, and are both connected to the inner wall of the shell through connecting components, and the two rotating shafts are controlled to rotate together by a driving component.

[0009] Preferably, the connecting component comprises a rotating ring rotatably sleeved on the rotating shaft and a connecting rod fixedly mounted on the outer ring wall of the rotating ring, and the top end of the connecting rod is fixedly connected to the inner top wall of the shell.

[0010] Preferably, the driving component includes a driving motor, two first sprockets respectively fixedly sleeved on two rotating shafts, and a chain meshingly wound around the two first sprockets. The driving motor is fixedly mounted on the side wall of the U-shaped frame near the heat dissipation port, and the output shaft of the driving motor is fixedly connected to one of the rotating shafts.

[0011] Preferably, a reciprocating screw is horizontally rotatably installed on the inner wall of the shell, a slide is threadedly sleeved on the reciprocating screw, circular openings are symmetrically opened on the side walls of the shell, a hollow rod with one end designed to be closed is symmetrically fixedly installed on the inner wall of the shell, a piston rod is inserted into the sliding seal in the hollow rod, an air outlet pipe is fixedly installed on the closed end of the hollow rod, the two air outlet pipes are respectively located in the two circular openings, an air inlet pipe is fixedly installed on the lower surface of the hollow rod, both the air inlet pipe and the air outlet pipe are provided with a one-way valve, the two piston rods are fixedly connected to the slide, and the reciprocating screw is controlled to rotate by a transmission component.

[0012] Preferably, the transmission component comprises a second sprocket fixedly sleeved on the reciprocating screw rod, and the chain is meshed and wound around the second sprocket and the two first sprockets.

[0013] Preferably, a filter is fixedly installed in the heat dissipation port, and the filter is used to filter large-sized impurities.

[0014] Preferably, a rectangular frame covering two heat dissipation openings is fixedly mounted on the side wall of the shell, and a dustproof net is locked at the frame opening of the rectangular frame through a locking assembly.

[0015] Preferably, the locking assembly includes a plurality of screws fixedly mounted on the surface of the rectangular frame and a plurality of locking nuts respectively threadedly sleeved on the plurality of screws, and a plurality of through-holes are provided on the surface of the dustproof net for respectively passing the plurality of screws.

[0016] Preferably, the longitudinal section of the screw is elliptical, the locking nut is limited in rotation by a limiting component, the limiting component includes two rubber blocks fixedly connected by a U-shaped rod, and two symmetrically arranged limiting spaces are formed between the surface of the screw and the inner wall of the locking nut, and the two rubber blocks are respectively inserted in the two limiting spaces.

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

[0018] 1. The use of high-precision ultrasonic liquid level probe and data fusion algorithm significantly improves the accuracy and reliability of power transformer oil level detection, which can meet the requirements of modern power systems for refined management of transformers. The design of the signal conditioning module effectively improves the signal quality. The versatility of the microcontroller module enhances the stability and intelligence of the detection device. The communication module supports multiple communication protocols, realizes remote transmission and safe monitoring of oil level data, and facilitates power operation and maintenance personnel to timely grasp the operating status of the transformer and conduct centralized management;

[0019] 2. The heat dissipation component can discharge the heat accumulated in the shell during the operation of multiple modules, thereby achieving the effect of heat dissipation and preventing multiple modules in the shell from being damaged due to long-term operation in a high-temperature environment;

[0020] 3. Under the action of the transmission parts, when the heat dissipation component is performing heat dissipation work, the reciprocating screw will also rotate, so that the hot air in the shell can be intermittently absorbed and discharged to the outside of the shell, which improves the heat dissipation efficiency, and does not require additional electric drive devices, and does not generate additional electricity costs;

[0021] 4. Through the cooperation between the screw and the locking nut, the dust screen can be quickly disassembled and assembled. At the same time, under the action of the limiting component, the locking nut can be locked on the screw to limit the rotation of the locking nut, avoiding the loosening of the connection of the dust screen due to the self-rotation of the locking nut, thereby improving the stability of the dust screen installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front perspective structural diagram of a digital oil level detection device for a power transformer proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the front part of the shell of a digital oil level detection device for a power transformer proposed by the present invention;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the side portion of the shell of a digital oil level detection device for a power transformer proposed by the present invention;

[0025] Figure 4It is a partial three-dimensional structural schematic diagram of a rectangular frame, a heat dissipation component, a driving component and a reciprocating screw rod in a digital oil level detection device for a power transformer proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of a partially disassembled three-dimensional structure of a rectangular frame, a filter screen and a locking component in a digital oil level detection device for a power transformer proposed by the present invention;

[0027] Figure 6 It is a partial three-dimensional structural schematic diagram of a locking component and a limiting component in a digital oil level detection device for a power transformer proposed by the present invention;

[0028] Figure 7 for Figure 2 The enlarged structural diagram at A in the middle;

[0029] Figure 8 for Figure 5 Enlarged structural diagram at B in the middle.

[0030] In the figure: 1 shell, 2 ultrasonic liquid level probe, 3 signal conditioning module, 4 microcontroller module, 5 communication module, 6 power module, 7 U-shaped frame, 8 support rod, 9 liquid crystal display, 10 shaft, 11 rotating blade, 12 rotating ring, 13 connecting rod, 14 driving motor, 15 first sprocket, 16 chain, 17 reciprocating screw rod, 18 slide plate, 19 hollow rod, 20 piston rod, 21 outlet pipe, 22 inlet pipe, 23 second sprocket, 24 filter screen, 25 rectangular frame, 26 dust net, 27 screw rod, 28 rubber block, 29 locking nut, 30 U-shaped rod, 31 through-hole. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1-Figure 8 A digital detection device for oil level of a power transformer includes a shell 1, an ultrasonic liquid level probe 2, a signal conditioning module 3, a microcontroller module 4, a communication module 5 and a power module 6. A plurality of U-shaped frames 7 are fixedly installed on the top of the shell 1. The signal conditioning module 3, the microcontroller module 4 and the communication module 5 are respectively fixedly installed on the plurality of U-shaped frames 7. The signal conditioning module 3 is electrically connected to the ultrasonic liquid level probe 2, the microcontroller module 4 is electrically connected to the signal conditioning module 3, the communication module 5 is electrically connected to the microcontroller module 4, and the power module 6 is fixedly installed on the bottom of the shell 1 and is used to provide a stable power supply for the entire detection device.

[0033] The ultrasonic liquid level probe 2 is installed at an appropriate position inside the oil tank of the power transformer. It is used to transmit ultrasonic waves and receive reflected echoes. The oil level height information is calculated based on the propagation time of the ultrasonic waves. It has the characteristics of high temperature resistance and corrosion resistance and can adapt to the complex working environment inside the transformer oil tank.

[0034] The signal conditioning module 3 is used to amplify, filter and process the weak electrical signal output by the ultrasonic liquid level probe 2 to improve the quality and stability of the signal, so as to facilitate the accurate collection and processing of the subsequent microcontroller module 4. The signal conditioning module 3 includes an amplifier circuit and a filter circuit. The amplifier circuit adopts a low-noise, high-gain operational amplifier, and the filter circuit adopts an active filter, which can effectively filter out interference signals, such as power supply ripple, electromagnetic interference, etc.

[0035] The microcontroller module 4 has a built-in high-performance microprocessor, which is responsible for receiving the oil level signal after signal conditioning and performing data processing and analysis. The microcontroller module 4 has a data storage function and can store historical oil level data within a certain period of time for data analysis and trend prediction. At the same time, the microcontroller module 4 can also calibrate and diagnose faults of the ultrasonic liquid level probe 2 to ensure the accuracy and reliability of the detection device.

[0036] The communication module 5 is used to transmit the oil level data processed by the microcontroller to the remote monitoring center. The communication module 5 supports multiple communication protocols, such as Wi-Fi, Bluetooth, etc., and can flexibly select the communication method according to the actual application scenario. Through the communication module 5, the power operation and maintenance personnel can receive the transformer oil level data in real time at the remote monitoring center, and conduct centralized management and analysis.

[0037] The power module 6 adopts an isolated power supply design, which can effectively isolate the strong electrical interference inside the power transformer and ensure the safe and stable operation of the detection device. The power module 6 also has a low power consumption design, which can reduce the energy consumption of the device and extend its service life.

[0038] The microcontroller module 4 is connected to a support rod 8 , the top end of the support rod 8 passes through the housing 1 and is fixedly mounted with a liquid crystal display screen 9 .

[0039] The liquid crystal display screen 9 is used to locally display information such as oil level height and oil temperature, which is convenient for on-site operation and maintenance personnel to view and operate.

[0040] The side wall of the shell 1 is symmetrically provided with heat dissipation ports, and a filter 24 is fixedly installed in the heat dissipation port. The filter 24 is used to filter large-sized impurities. A heat dissipation component is provided in the shell 1, and the heat dissipation component is used to discharge the hot air in the shell 1 from the heat dissipation port. The heat dissipation component includes two rotating shafts 10 and two rotating blades 11 fixedly sleeved on the two rotating shafts 10, respectively. The two rotating shafts 10 correspond to the positions of the two heat dissipation ports, respectively, and are connected to the inner wall of the shell 1 through a connecting component. The connecting component includes a rotating ring 12 rotatably sleeved on the rotating shaft 10 and a connecting rod 13 fixedly installed on the outer ring wall of the rotating ring 12. The top end of the connecting rod 13 is fixedly connected to the inner top wall of the shell 1. The two rotating shafts 10 are controlled to rotate together by a driving component. The driving component includes a driving motor 14, two first sprockets 15 fixedly sleeved on the two rotating shafts 10, and a chain 16 meshed and wound on the two first sprockets 15. The driving motor 14 is fixedly installed on the side wall of the U-shaped frame 7 near the heat dissipation port, and the output shaft of the driving motor 14 is fixedly connected to one of the rotating shafts 10.

[0041] When multiple modules are working in the shell 1, more heat will be generated, causing the temperature in the shell 1 to gradually increase. In order to avoid short circuits caused by multiple modules working in a high temperature environment for a long time, the drive motor 14 can be started. When the output shaft of the drive motor 14 is rotating, under the transmission action of the two first sprockets 15 and the chain 16, the two rotating shafts 10 will rotate with the rotating blades 11. When the rotating blades 11 rotate, the gas in the shell 1 can be sucked and discharged from the heat dissipation port, thereby achieving the effect of heat dissipation.

[0042] A reciprocating screw rod 17 is installed horizontally on the inner wall of the shell 1, and a slide plate 18 is threadedly sleeved on the reciprocating screw rod 17. A circular opening is symmetrically opened on the side wall of the shell 1. A hollow rod 19 with one end designed to be closed is symmetrically fixedly installed on the inner wall of the shell 1. A piston rod 20 is inserted in a sliding seal in the hollow rod 19. An air outlet pipe 21 is fixedly installed on the closed end of the hollow rod 19. The two air outlet pipes 21 are respectively located in the two circular openings. An air inlet pipe 22 is fixedly installed on the lower surface of the hollow rod 19. Both the inlet pipe 22 and the outlet pipe 21 are provided with a one-way valve. The conducting direction of the one-way valve in the inlet pipe 22 is from the shell 1 to the hollow rod 19, and the conducting direction of the one-way valve in the outlet pipe 21 is from the hollow rod 19 to the outside. The two piston rods 20 are fixedly connected to the slide plate 18, and the reciprocating screw 17 is controlled to rotate by a transmission component. The transmission component includes a second sprocket 23 fixedly sleeved on the reciprocating screw 17, and the chain 16 is meshed and wound around the second sprocket 23 and the two first sprockets 15.

[0043] When the output shaft of the drive motor 14 rotates, the reciprocating screw 17 will also rotate under the transmission action of the chain 16 and the second sprocket 23, and the slide plate 18 threadedly sleeved on the reciprocating screw 17 will carry the two piston rods 20 to move back and forth laterally. The space volume between the end of the piston rod 20 and the inner wall of the hollow rod 19 will continue to change from large to small and then from small to large. When the space volume becomes larger, the pressure in the hollow rod 19 decreases, and the hot air in the shell 1 will enter the hollow rod 19 from the air inlet pipe 22. When the space volume becomes smaller, the pressure in the hollow rod 19 will increase, and the hot air in the hollow rod 19 will be discharged from the shell 1 from the air outlet pipe 21, thereby improving the heat dissipation efficiency, and no additional electric drive device is required, and no additional electricity cost is incurred.

[0044] A rectangular frame 25 covering two heat dissipation ports is fixedly mounted on the side wall of the shell 1, and a dust screen 26 is locked at the frame opening of the rectangular frame 25 through a locking assembly. The locking assembly includes a plurality of screws 27 fixedly mounted on the surface of the rectangular frame 25 and a plurality of locking nuts 29 respectively threadedly sleeved on the plurality of screws 27. The surface of the dust screen 26 is provided with a plurality of through openings 31 for the plurality of screws 27 to pass through.

[0045] The dustproof net 26 can prevent some external dust from entering the shell 1 through the heat dissipation port. When the dustproof net 26 needs to be installed, just align the multiple openings 31 on the surface of the dustproof net 26 with the multiple screws 27 respectively, and make the multiple screws 27 pass through the multiple openings 31 respectively, so that the dustproof net 26 is sleeved on the multiple screws 27. At this time, the multiple locking nuts 29 are respectively threaded on the multiple screws 27 and tightened to complete the installation. When the dustproof net 26 needs to be disassembled for replacement or cleaning, just rotate the locking nut 29 to remove the locking nut 29 from the screw 27, and then remove the dustproof net 26. It is convenient and quick.

[0046] The longitudinal section of the screw rod 27 is elliptical, and the locking nut 29 is limited in rotation by a limiting component. The limiting component includes two rubber blocks 28 fixedly connected by a U-shaped rod 30. Two symmetrically arranged limiting spaces are formed between the surface of the screw rod 27 and the inner wall of the locking nut 29, and the two rubber blocks 28 are respectively inserted in the two limiting spaces.

[0047] After the locking nut 29 is tightened on the screw rod 27, the two rubber blocks 28 can be aligned with the two restricted spaces respectively and then inserted. Since the rubber block 28 has good elasticity, tension and friction, after being inserted into the restricted space, the rubber block 28 can limit the rotation of the locking nut 29. At the same time, the friction between the contact surface of the rubber block 28 and the locking nut 29 will also be relatively large. When it is necessary to control the rotation of the locking nut 29, first pull the U-shaped rod 30 to take the two rubber blocks 28 out of the two restricted spaces and then rotate the locking nut 29.

[0048] In the present invention, a high-precision ultrasonic liquid level probe 2 and a data fusion algorithm are used to significantly improve the accuracy and reliability of oil level detection of power transformers, which can meet the requirements of modern power systems for refined management of transformers. The design of the signal conditioning module 3 effectively improves the signal quality. The versatility of the microcontroller module 4 enhances the stability and intelligence of the detection device. The communication module 5 supports multiple communication protocols, realizes remote transmission and safe monitoring of oil level data, and facilitates power operation and maintenance personnel to timely grasp the operating status of the transformer and conduct centralized management.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A digital detection device for oil level of a power transformer, comprising a housing (1), an ultrasonic liquid level probe (2), a signal conditioning module (3), a microcontroller module (4), a communication module (5) and a power module (6), characterized in that: A plurality of U-shaped frames (7) are fixedly mounted on the top of the housing (1); the signal conditioning module (3), the microcontroller module (4) and the communication module (5) are respectively fixedly mounted on the plurality of U-shaped frames (7); the signal conditioning module (3) is electrically connected to the ultrasonic liquid level probe (2); the microcontroller module (4) is electrically connected to the signal conditioning module (3); the communication module (5) is electrically connected to the microcontroller module (4); and the power module (6) is fixedly mounted on the bottom of the housing (1) and is used to provide a stable power supply for the entire detection device; The microcontroller module (4) is connected to a support rod (8), the top end of the support rod (8) passes through the shell (1) and is fixedly mounted with a liquid crystal display screen (9), the side wall of the shell (1) is symmetrically provided with heat dissipation openings, and a heat dissipation component is provided in the shell (1), and the heat dissipation component is used to discharge hot air in the shell (1) from the heat dissipation openings.

2. A digital detection device for oil level of a power transformer according to claim 1, characterized in that: The heat dissipation assembly comprises two rotating shafts (10) and two rotating blades (11) respectively fixedly sleeved on the two rotating shafts (10); the two rotating shafts (10) respectively correspond to the positions of two heat dissipation ports and are both connected to the inner wall of the housing (1) via a connecting component; the two rotating shafts (10) are controlled to rotate together by a driving component.

3. A digital detection device for oil level of a power transformer according to claim 2, characterized in that: The connecting component comprises a rotating ring (12) rotatably sleeved on a rotating shaft (10) and a connecting rod (13) fixedly mounted on an outer ring wall of the rotating ring (12); the top end of the connecting rod (13) is fixedly connected to the inner top wall of the housing (1).

4. A digital detection device for oil level of a power transformer according to claim 2, characterized in that: The driving component comprises a driving motor (14), two first sprockets (15) respectively fixedly sleeved on two rotating shafts (10), and a chain (16) meshed and wound around the two first sprockets (15); the driving motor (14) is fixedly mounted on a side wall of a U-shaped frame (7) close to a heat dissipation port, and an output shaft of the driving motor (14) is fixedly connected to one of the rotating shafts (10).

5. A digital detection device for oil level of a power transformer according to claim 4, characterized in that: A reciprocating screw (17) is horizontally rotatably mounted on the inner wall of the shell (1), a slide plate (18) is threadedly sleeved on the reciprocating screw (17), a circular opening is symmetrically opened on the side wall of the shell (1), a hollow rod (19) with one end of the closed opening is symmetrically fixedly mounted on the inner wall of the shell (1), a piston rod (20) is inserted in a sliding seal in the hollow rod (19), an air outlet pipe (21) is fixedly mounted on the closed end of the hollow rod (19), two air outlet pipes (21) are respectively located in the two circular openings, an air inlet pipe (22) is fixedly mounted on the lower surface of the hollow rod (19), a one-way valve is provided in both the air inlet pipe (22) and the air outlet pipe (21), the two piston rods (20) are fixedly connected to the slide plate (18), and the reciprocating screw (17) is controlled to rotate by a transmission component.

6. A digital detection device for oil level of a power transformer according to claim 5, characterized in that: The transmission component comprises a second sprocket (23) fixedly sleeved on a reciprocating screw rod (17), and the chain (16) is meshed and wound around the second sprocket (23) and the two first sprockets (15).

7. A digital detection device for oil level of a power transformer according to claim 1, characterized in that: A filter screen (24) is fixedly installed in the heat dissipation port, and the filter screen (24) is used to filter large-sized impurities.

8. A digital detection device for oil level of a power transformer according to claim 1, characterized in that: A rectangular frame (25) covering two heat dissipation openings is fixedly mounted on the side wall of the housing (1), and a dustproof net (26) is locked at the frame opening of the rectangular frame (25) via a locking assembly.

9. A digital detection device for oil level of a power transformer according to claim 8, characterized in that: The locking assembly comprises a plurality of screw rods (27) fixedly mounted on the surface of the rectangular frame (25) and a plurality of locking nuts (29) respectively threadedly sleeved on the plurality of screw rods (27); the surface of the dustproof net (26) is provided with a plurality of through openings (31) respectively used for the plurality of screw rods (27) to pass through.

10. A digital detection device for oil level of a power transformer according to claim 9, characterized in that: The longitudinal section of the screw rod (27) is elliptical. The locking nut (29) is restricted in rotation by a restriction component. The restriction component comprises two rubber blocks (28) fixedly connected by a U-shaped rod (30). Two symmetrically arranged restriction spaces are formed between the surface of the screw rod (27) and the inner wall of the locking nut (29). The two rubber blocks (28) are respectively inserted into the two restriction spaces.

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