Online monitoring device for oil level of transformer expansion tank and control method

Abstract

According to the on-line monitoring device for the oil level of the transformer expansion tank and the control method, the oil level of the transformer expansion tank is monitored in real time and remotely through the ultrasonic transducer, the repeater and other assemblies, non-contact measurement is achieved, installation and maintenance are convenient, the multifunctional display and remote transmission functions are achieved, and the operation and maintenance efficiency of a transformer is improved; the device comprises an ultrasonic transducer and a repeater, wherein the ultrasonic transducer is electrically connected with the repeater; the ultrasonic transducer comprises a shell, a spring is arranged in the shell, the upper end of the shell is in threaded connection with a fixing cover, and the lower end of the shell is in threaded connection with a corrugated pipe joint; the lower end of the elastic pressing assembly is clamped into an inner ring of the upper portion of the spring, the ultrasonic sensor is embedded into the upper end of the elastic pressing assembly, and the elastic pressing assembly is fixed into the shell through a fixing cover; the center of the fixing cover is provided with a round hole for the ultrasonic sensor to extend to the outer side of the fixing cover, the upper end of the fixing cover is further provided with an annular groove, and a magnet is arranged in the annular groove.

Description

Technical Field

[0001] The invention relates to the technical field of oil conservator monitoring, and in particular to an online monitoring device and a control method for an oil level of a transformer oil conservator. Background Art

[0002] The oil level of the transformer conservator, that is, the height of the transformer oil in the conservator, will fluctuate with the operating status of the transformer and changes in the external environment. The height of the oil level can reflect the operating status of the transformer. For example, a high oil level may mean that the transformer is overloaded or there is an internal fault, while a low oil level may cause the transformer insulation performance to deteriorate, affecting the stable operation of the equipment and even causing a fault.

[0003] By regularly monitoring the oil level, potential faults can be discovered and dealt with in a timely manner to prevent the situation from getting worse. For example, when the oil level drops abnormally, you can check whether there is oil leakage or oil seepage, and take timely measures to repair it, thereby preventing the occurrence of faults. This can not only ensure the safe operation of the transformer, but also reduce maintenance costs and extend the service life of the equipment.

[0004] Currently, the most common method is for operation and maintenance personnel to determine the amount of oil in the transformer by observing the oil level gauge and calculating the oil level height of the oil pillow. The existing ultrasonic level detection method has the problem that it is necessary to open a hole in the container during installation, thereby destroying the container structure and the sound waves being affected by volatile media. It has low accuracy, destroys the integrity of the container, and may also cause safety hazards such as oil leakage. Since it is necessary to open a hole in the container and seal it, the installation process of the existing ultrasonic level detection device is relatively complicated, which increases the installation time and cost; There is also a lack of real-time communication capabilities with the data center, and operation and maintenance personnel are unable to obtain monitoring data in a timely manner, and are unable to monitor and analyze the operating status of the transformer in real time.

[0005] Therefore, developing a device that is easy to install and maintain and can monitor the oil level in real time is of great significance for the operation and maintenance of power equipment such as transformers. Summary of the invention

[0006] The present invention aims to address the technical defects of the prior art and provide a transformer oil conservator oil level online monitoring device and control method, which utilizes components such as ultrasonic transducers and repeaters to achieve real-time monitoring and remote monitoring of the transformer oil conservator oil level. It has non-contact measurement, easy installation and maintenance, and multi-functional display and remote transmission functions, thereby improving the efficiency of transformer operation and maintenance.

[0007] The present invention provides the following technical solutions: A transformer oil conservator oil level online monitoring device comprises an ultrasonic transducer and a repeater, wherein the ultrasonic transducer and the repeater are electrically connected; Ultrasonic transducers include: A housing, wherein a spring is provided in the housing, the upper end of the housing is threadedly connected to a fixing cover, and the lower end of the housing is threadedly connected to a bellows joint; A spring-pressing assembly, wherein the lower end of the spring-pressing assembly is clamped into the inner ring of the upper part of the spring, the upper end of the spring-pressing assembly is embedded in the ultrasonic sensor, and the spring-pressing assembly is fixed to the housing through a fixing cover; A fixed cover, wherein a circular hole is provided at the center of the fixed cover for the ultrasonic sensor to extend to the outside of the fixed cover, and an annular groove is also provided at the upper end of the fixed cover, wherein a magnet is provided in the annular groove; An ultrasonic sensor, wherein an ultrasonic probe line at the bottom of the ultrasonic sensor passes through the shell and is connected to the repeater; The repeater includes a box body, which is hinged to a box cover. A lithium battery, a circuit board, and an oil level digital board are arranged in the box body. A self-reset switch, a threading connector, a 4-core aviation plug, and a 6-core aviation plug are arranged at the bottom of the box body. A 4G antenna is arranged on the upper part of the box body. A transparent window is arranged on the box cover corresponding to the position of the oil level digital board for displaying the distance and relative height percentage.

[0008] Furthermore, The spring pressing component comprises: An insulating gasket, which is arranged between the spring pressing piece and the fixing piece; A spring pressing piece, wherein the bottom of the spring pressing piece is provided with a convex edge corresponding to the inner ring of the spring, and is used for clamping into the inner ring of the spring; A fixing piece, wherein an inner ring extending upward from the bottom of the fixing piece is provided with an annular groove for accommodating an insulating gasket, and the fixing piece is threadedly connected with a spring compression piece.

[0009] Furthermore, The shell is provided with a long hole matching the spring. The spring extends to the outside of the long hole. The bottom of the long hole is provided with an annular convex structure inwardly. The bottom end face of the spring is supported on the annular convex.

[0010] Furthermore, The circuit board includes a control module, a signal control module, a communication module, a power module, and a temperature measurement module; The output ends of the signal control module, the power module and the temperature measurement module are connected to the control module, the output end of the control module is connected to the communication module, and the signal control module is electrically connected to the ultrasonic sensor.

[0011] Furthermore, The signal control module controls the transmitter of the ultrasonic sensor to send ultrasonic waves; The signal control module controls the receiver of the ultrasonic sensor to receive and process the returned ultrasonic signal.

[0012] Furthermore, The material of the spring pressing piece and the fixing piece is polytetrafluoroethylene; The insulating gasket is a red steel paper gasket; Shockproof cotton is arranged between the fixing piece and the ultrasonic sensor.

[0013] Furthermore, The bellows joint and the threading joint are connected by a bellows, and the ultrasonic probe line passes through the bellows and is electrically connected to the signal control module.

[0014] Furthermore, A mounting back plate is provided at the bottom of the box body.

[0015] Furthermore, It also includes a digital board fixing plate for fixing the oil level digital board, and the digital board fixing plate is fixed to the box body by bolts.

[0016] The control method of the transformer oil conservator oil level online monitoring device performs the following steps: Step 1: Installation; The ultrasonic transducer is magnetically attached to the bottom or side of the outer wall of the oil pillow to be tested, and the repeater is installed on the column adjacent to the ultrasonic transducer; Step 2: Control the emission of ultrasonic waves, receive the returned ultrasonic signals, and calculate the oil level of the transformer conservator; Transmit ultrasonic signal: The signal control module controls the ultrasonic sensor to transmit ultrasonic signal into the transformer oil conservator. The ultrasonic signal will be reflected back when it encounters the oil surface. Receive the returned ultrasonic signal: The signal control module controls the ultrasonic sensor to receive the ultrasonic signal reflected from the oil surface. Since the propagation speed of ultrasonic waves in the air is known, the control module calculates the distance between the oil surface of the transformer oil pillow and the ultrasonic sensor by measuring the round-trip time of the ultrasonic signal; Calculate the oil level: Calculate the oil level in the transformer oil conservator based on the distance between the ultrasonic sensor and the oil level in the transformer oil conservator and the installation position of the ultrasonic sensor; Step 3: Data transmission: The communication module wirelessly uploads the oil level data of the transformer oil pillow to the background data center.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses an online monitoring device for transformer oil conservator oil level, which uses components such as ultrasonic transducers and repeaters to realize real-time monitoring and remote monitoring of transformer oil conservator oil level, and has non-contact measurement, convenient installation and maintenance, and multi-functional display and remote transmission functions; The device includes an ultrasonic transducer and a repeater. The ultrasonic transducer is one of the core components of the device. It is responsible for transmitting and receiving ultrasonic signals to measure the oil level. Its specific structure is as follows: Shell: There is a spring inside, the upper end is threadedly connected to the fixed cover, and the lower end is threadedly connected to the bellows joint, which plays a role in supporting and protecting the internal components, and at the same time, it is firmly combined with other parts through threaded connection; Spring pressure assembly: The lower end is inserted into the upper inner ring of the spring, and the upper end is embedded in the ultrasonic sensor, which is fixed to the housing through the fixing cover. It can transmit the elastic force of the spring to the ultrasonic sensor, ensuring that the sensor always receives the pressure of the spring during operation and fits firmly with the mounting surface, thereby improving the accuracy and reliability of the measurement; Fixed cover: A circular hole is provided at the center for the ultrasonic sensor to extend to the outside of the fixed cover so that the sensor can normally transmit and receive ultrasonic signals. An annular groove is also provided at the upper end, and a magnet is provided in the groove. The function of the magnet may be to enhance the adsorption force between the device and the measured object such as the transformer oil pillow, so as to make the device more stable during installation and use, and reduce displacement or falling off caused by factors such as vibration; Ultrasonic sensor: The ultrasonic sensor is responsible for transmitting and receiving ultrasonic signals. The ultrasonic probe line at the bottom of the sensor passes through the shell and is connected to the repeater, which then controls the emission and reception of ultrasonic signals. The repeater calculates the height of the oil level based on the propagation time of the ultrasonic wave and the sound velocity of the medium. The specific structure of the repeater is as follows: Box body: It is equipped with lithium battery, circuit board, oil level digital board and other important components to provide power support and data processing functions for the normal operation of the device. The bottom is equipped with self-reset switch, threading connector, 4-core aviation plug and 6-core aviation plug. These interfaces and switches are used to realize power control, signal transmission and connection and communication with other devices. Box cover: It is hinged on the box body, which is convenient to open and close and protects the components in the box body. A transparent window is provided on the box cover corresponding to the position of the oil level digital board. The transparent window design enables the numbers on the oil level digital board to be clearly displayed, so that the staff can intuitively read the distance and relative height percentage of the oil level, so as to timely understand the oil level status of the transformer oil pillow; 4G antenna: installed on the upper part of the box, it uploads the monitored oil level data to the data center through wireless communication, realizing real-time online monitoring of the oil level of the transformer conservator, making it convenient for the operation and inspection personnel to grasp the operation status of the equipment anytime and anywhere, and timely discover and deal with possible abnormal oil level conditions; Based on the above structural characteristics, this device has the following advantages: 1. High measurement accuracy The ultrasonic sensor can accurately transmit and receive ultrasonic signals, and calculate the oil level by measuring the propagation time of ultrasonic waves in the oil. Since the propagation speed of ultrasonic waves in liquids is relatively stable, and the device transmits the elastic force of the spring to the ultrasonic sensor through the spring pressure component, the relative position of the sensor and the oil surface is ensured to be stable, thereby improving the accuracy of measurement, being able to accurately monitor small changes in the oil level, and providing reliable data support for the safe operation of the transformer; 2. Easy to install and maintain Magnet adsorption and fixation. A magnet is set in the annular groove on the fixing cover. No complicated fixing structure or tools are required. The device only needs to be adsorbed on the bottom or side of the outer wall of the oil pillow, which greatly reduces the installation time and workload. In addition, the connection method of each component in the structure is clear. When the device fails or parts need to be replaced, the staff can quickly locate the problem and repair or replace it, reducing the difficulty and cost of maintenance. 3. Real-time monitoring and remote transmission The remote communication function of the 4G antenna, the 4G antenna on the upper part of the box body realizes the wireless transmission of monitoring data, and sends the oil level information to the data center in real time. The oil level status of the transformer conservator can be checked anytime and anywhere without manual inspection on site, which greatly improves the work efficiency and facilitates timely detection of oil level abnormalities and taking corresponding measures; The intuitive display of the oil level digital board. The transparent window on the box cover can clearly display the numbers on the oil level digital board, including information such as distance and relative height percentage, providing an intuitive oil level reference for on-site staff. Even without remote monitoring equipment, staff can quickly understand the oil level situation and handle it on-site in a timely manner, which enhances the practicality and flexibility of the device. In summary, the transformer oil conservator oil level online monitoring device realizes the real-time monitoring and remote monitoring of the transformer oil conservator oil level through the synergistic effect of components such as ultrasonic transducers and repeaters. The device has non-contact measurement, easy installation and maintenance, and multi-function display and remote transmission functions. It can effectively improve the efficiency of transformer operation and maintenance and has broad application prospects in power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the ultrasonic transducer of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the repeater of the present invention; Figure 3 for Figure 1 An exploded view of the illustrated embodiment; Figure 4-1 It is a schematic diagram of the main structure of a specific implementation of an ultrasonic transducer; Figure 4-2 for Figure 4-1AA section view; Figure 5 It is a schematic diagram of the local structure of the ultrasonic transducer; Figure 6 This is an exploded view of the spring-pressed component; Figure 7 for Figure 2 Schematic diagram of the internal structure; Figure 8 It is a control structure diagram of the present invention.

[0019] Description of reference numerals: 1. Ultrasonic transducer; 2. Repeater; 1-1, housing; 1-2, fixing cover; 1-3, ultrasonic sensor; 1-4, magnet; 1-5, spring pressure assembly; 1-6, spring; 1-7, bellows joint; 1-8, ultrasonic probe line; 1-51, insulating gasket; 1-52, spring pressure piece; 1-53, fixing piece; 2-1. Box cover; 2-2. Window; 2-3. Oil level digital board; 2-4. Box body; 2-5. Circuit board; 2-6. Lithium battery; 2-7. Digital board fixing plate; 2-8. Threading connector; 2-9. Self-reset switch; 2-10. 4-core aviation plug; 2-11. 6-core aviation plug; 2-12. 4G antenna; 2-13. Install the back panel. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0021] like Figures 1 to 3 , Figure 4-1 , Figure 4-2 , Figures 5 to 8 As shown, it shows a specific embodiment of the present invention: As shown in the figure, the transformer oil conservator oil level online monitoring device disclosed in the present invention comprises an ultrasonic transducer 1 and a repeater 2, wherein the ultrasonic transducer 1 and the repeater 2 are electrically connected; The ultrasonic transducer 1 comprises: A shell 1-1, wherein a spring 1-6 is provided inside the shell 1-1, the upper end of the shell 1-1 is threadedly connected to a fixing cover 1-2, and the lower end of the shell 1-1 is threadedly connected to a bellows joint 1-7; A spring-pressing assembly 1-5, wherein the lower end of the spring-pressing assembly 1-5 is clamped into the inner ring of the upper part of the spring 1-6, the upper end of the spring-pressing assembly 1-5 is embedded in the ultrasonic sensor 1-3, and the spring-pressing assembly 1-5 is fixed to the housing 1-1 through a fixing cover 1-2; A fixed cover 1-2, wherein a circular hole is provided at the center of the fixed cover 1-2 for the ultrasonic sensor 1-3 to extend to the outside of the fixed cover 1-2, and an annular groove is also provided at the upper end of the fixed cover 1-2, wherein a magnet 1-4 is provided in the annular groove; An ultrasonic sensor 1-3, wherein an ultrasonic probe line 1-8 at the bottom of the ultrasonic sensor 1-3 passes through the housing 1-1 and is connected to the repeater 2; The repeater 2 includes a box body 2-4, the box body 2-4 is hinged to a box cover 2-1, a lithium battery 2-6, a circuit board 2-5, and an oil level digital board 2-3 are arranged in the box body 2-4, a self-reset switch 2-9, a threading connector 2-8, a 4-core aviation plug 2-10, and a 6-core aviation plug 2-11 are arranged at the bottom of the box body 2-4, a 4G antenna 2-12 is arranged on the upper part of the box body 2-4, and a transparent window 2-2 is arranged on the box cover 2-1 at the position corresponding to the oil level digital board 2-3, which is used to display the distance and relative height percentage.

[0022] The working principle of the present invention is as follows: the signal control module controls the ultrasonic transducer 1 to emit an ultrasonic signal. When the signal encounters the oil surface in the oil pillow, it will be reflected back and received by the ultrasonic sensors 1-3. The control module measures the time difference between the emission and reception of the ultrasonic signal and combines the propagation speed of the ultrasonic wave in the medium to calculate the height of the oil surface. The communication module receives the data and uploads it to the data center.

[0023] Preferably, Figure 6 As shown, The spring pressure assembly 1-5 comprises: An insulating gasket 1-51, wherein the insulating gasket 1-51 is arranged between the spring pressure piece 1-52 and the fixing piece 1-53; A spring pressing piece 1-52, wherein the bottom of the spring pressing piece 1-52 is provided with a convex edge corresponding to the inner circle of the spring 1-6, and is used for clamping into the inner circle of the spring 1-6; The fixing member 1-53 has an inner ring extending upward from the bottom thereof and is provided with an annular groove for accommodating the insulating gasket 1-51, and the fixing member 1-53 is threadedly connected to the spring compression member 1-52.

[0024] The insulating gasket 1-51 is arranged between the spring pressure piece 1-52 and the fixing piece 1-53, and mainly plays the role of electrical insulation.

[0025] The spring pressing piece 1-52 has a convex edge at the bottom corresponding to the inner circle of the spring 1-6, which is used to snap into the inner circle of the spring 1-6. The spring 1-6 is fixed to the bottom of the spring pressing component 1-5, and the ultrasonic sensor 1-3 is pushed to the installation surface of the oil pillow by the elastic force of the spring 1-6.

[0026] The fixing member 1-53 has an inner ring extending upward from the bottom and is provided with an annular groove for accommodating the insulating gasket 1-51, which is threadedly connected with the spring pressure member 1-52. Together with the spring pressure member 1-52, it constitutes the main structure of the spring pressure assembly 1-5 and the ultrasonic sensor 1-3.

[0027] When the ultrasonic sensor 1-3 is magnetically attracted to the outer wall of the oil pillow to be measured, the spring 1-6 is compressed and generates elastic force when compressed by external force. This elastic force is the elastic pressure component 1-5 that presses the ultrasonic sensor 1-3 to make it close to the installation surface of the oil pillow. Appropriate pressure can ensure good contact between the ultrasonic sensor 1-3 and the installation surface of the oil pillow, thereby improving the measurement accuracy and stability of the ultrasonic sensor 1-3.

[0028] In summary, the spring pressure assembly 1-5 uses the elastic force of the spring 1-6 to press the ultrasonic sensor 1-3 against the installation surface of the oil pillow through the synergistic effect of the insulating gasket 1-51, the spring pressure piece 1-52 and the fixing piece 1-53. This structure not only ensures the stability and measurement accuracy of the ultrasonic sensor 1-3, but also improves the safety and reliability of the equipment.

[0029] Preferably, Figure 3 , Figure 4-1 and Figure 4-2 As shown, The shell 1-1 is provided with a long hole matching the spring 1-6, and the spring 1-6 extends to the outside of the long hole. An annular convex edge structure is provided inward at the bottom of the long hole, and the bottom end face of the spring 1-6 is supported on the annular convex edge.

[0030] Inside the housing 1-1, a long hole is designed to match the spring 1-6. The main function of this long hole is to accommodate the spring 1-6 and provide it with necessary support and guidance. The size of the long hole is determined according to the outer diameter and length of the spring 1-6 to ensure that the spring 1-6 can be stably installed in the housing 1-1 and that the spring 1-6 can be smoothly extended and retracted in the housing 1-1 without being hindered or stuck.

[0031] The inner diameter of the long hole is slightly larger than the outer diameter of the spring 1-6 to provide enough space for the spring 1-6 to move freely in the housing 1-1. At the bottom of the long hole, an annular convex structure is set inward. The main function of this annular convex is to support the bottom end face of the spring 1-6. When the spring 1-6 is compressed, its bottom end face will fit tightly on the annular convex, thereby improving the stability of the spring 1-6.

[0032] Through the combined effect of the long hole and the annular convex structure, the spring 1-6 is stably supported inside the housing 1-1. When the spring 1-6 is subjected to external force (such as pressure from the spring-pressing assembly 1-5), it will smoothly expand and contract in the long hole, while its bottom end face will be supported by the annular convex edge. This design not only ensures that the spring 1-6 can always remain in the correct position, but also improves its stability and durability.

[0033] Preferably, Figure 8 As shown, The circuit board 2-5 includes a control module, a signal control module, a communication module, a power module, and a temperature measurement module; The output ends of the signal control module, the power module and the temperature measurement module are connected to the control module, the output end of the control module is connected to the communication module, and the signal control module is electrically connected to the ultrasonic sensors 1-3.

[0034] Circuit board 2-5 is responsible for receiving, processing and transmitting signals from ultrasonic sensors 1-3, and communicating with the PMS system (i.e., State Grid Data Center). It includes multiple functional modules, control module, signal control module, communication module, power module and temperature measurement module. These modules work together to realize the overall function of the equipment.

[0035] The control module controls the coordinated work of the entire system, controls the signal control circuit to send and receive in an orderly manner, times the moment of sending and receiving ultrasonic waves, calculates distance data, and controls the communication module upward to complete the interaction.

[0036] Signal control module, the control part is the control of the main working system. First, it controls the transmitter part to emit ultrasonic waves, then controls the receiver part to receive and process ultrasonic signals, determines whether the received ultrasonic waves are emitted by itself, and finally identifies the received ultrasonic waves.

[0037] The communication module uploads data, completes data interaction, and supports multiple communication methods, such as 4G, LORA, Wi-Fi, Bluetooth, etc. 4G is used in this embodiment to ensure real-time transmission and reliability of data.

[0038] The power module supplies power to all modules. It receives power from the lithium battery 2-6 and converts it into voltage and current suitable for each module of the circuit board 2-5. The power module has functions such as overvoltage protection and overcurrent protection to ensure that the circuit board 2-5 operates within a safe voltage and current range. At the same time, it can also monitor the battery power status and send an alarm signal when the power is low, reminding the operation and maintenance personnel to replace the battery in time.

[0039] Temperature measurement module: The temperature measurement module is used to monitor the temperature at the installation location. It can perform temperature compensation on the measurement accuracy of the liquid level in the oil pillow (the propagation speed of ultrasonic waves in the medium is affected by temperature) to improve the accuracy and stability of the measurement. At the same time, the temperature measurement module can also send temperature data to the remote monitoring system so that the operation and maintenance personnel can understand the temperature status of the transformer oil pillow in real time.

[0040] In summary, the circuit boards 2-5 and their various modules work together to realize the overall function of the transformer oil pillow oil level online monitoring device.

[0041] Preferably, Figure 8 As shown, The signal control module controls the transmitter of the ultrasonic sensor 1-3 to send ultrasonic waves; The signal control module controls the receivers of the ultrasonic sensors 1 - 3 to receive and process the returned ultrasonic signals.

[0042] The signal control module is responsible for managing the signal interaction with ultrasonic sensors 1-3, which includes controlling the emission and reception of ultrasonic waves to ensure that the sensors can accurately measure and return the required data.

[0043] Control the transmitter to send ultrasonic waves; Instruction reception: The signal control module first receives instructions from the control module. These instructions usually include parameters such as when to transmit ultrasonic waves, the frequency of transmission, and pulse width.

[0044] Transmitter activation: After receiving the command, the signal control module will send an activation signal to the transmitter of ultrasonic sensor 1-3.

[0045] Ultrasonic emission: When the transmitter receives an activation signal, it converts electrical energy into mechanical energy to generate ultrasonic waves. These ultrasonic waves are emitted into the transformer conservator at a certain frequency and intensity.

[0046] In summary, the signal control module realizes the transmission, reception and processing of ultrasonic signals by accurately controlling the transmitter and receiver of ultrasonic sensors 1-3. These processes together constitute the core measurement function of the transformer oil conservator oil level online monitoring device.

[0047] Preferably, The material of the spring compression piece 1-52 and the fixing piece 1-53 is polytetrafluoroethylene; The insulating gasket 1-51 is made of red steel paper gasket; Shockproof cotton is arranged between the fixing member 1-53 and the ultrasonic sensor 1-3.

[0048] The material of the spring pressure piece 1-52 and the fixing piece 1-53 is polytetrafluoroethylene, mainly to avoid forming a hard connection with the ultrasonic sensor 1-3, thereby improving the reliability and stability of monitoring.

[0049] The material of the insulating gasket 1-51 is selected from red steel paper gasket, and the main function of the red steel paper gasket is to provide electrical insulation and mechanical support. Therefore, selecting red steel paper gasket as the material of the insulating gasket 1-51 can ensure that it provides sufficient electrical insulation and mechanical strength in the spring-pressed component 1-5.

[0050] The shockproof cotton between the fixing member 1-53 and the ultrasonic sensor 1-3 can absorb and disperse vibration energy, reducing the interference of the ultrasonic sensor 1-3 when it is subjected to external vibration. This helps to improve the accuracy and stability of the measurement. At the same time, the shockproof cotton can also provide a certain buffering effect for the ultrasonic sensor 1-3 to prevent it from being damaged due to impact or vibration. Therefore, the shockproof cotton is arranged between the fixing member 1-53 and the ultrasonic sensor 1-3, which can further improve the measurement accuracy and stability of the transformer oil level online monitoring device.

[0051] Preferably, during on-site installation, The bellows connector 1-7 and the threading connector 2-8 are connected by a bellows, and the ultrasonic probe line 1-8 passes through the bellows and is electrically connected to the signal control module.

[0052] During power construction and related equipment installation, there are strict requirements for the protection and concealment of cables to ensure the safe operation of the equipment and the cleanliness and beauty of the site.

[0053] The bellows is a tubular elastic element with a corrugated shape. Its main functions include: The corrugated tube can tightly wrap the cable to protect it from damage by the external environment, such as abrasion, corrosion or mechanical damage.

[0054] Concealed cables: The corrugated tube has good concealment and can completely wrap the cables, making the construction site more tidy and beautiful, meeting the requirements of power construction for cable concealment.

[0055] Flexibility: The corrugated tube has a certain degree of elasticity and can adapt to the bending and movement of the cable in different directions, ensuring the flexibility and stability of the cable during the connection process.

[0056] Flame retardancy: High-quality corrugated pipe materials usually have good flame retardant properties, which can prevent the spread of fire to a certain extent and improve the safety of equipment.

[0057] During the power construction process, there are strict requirements for the concealment of cables. Using corrugated tubes to completely wrap the cables not only meets this requirement, but also improves the safety and reliability of the equipment. At the same time, the flexibility and easy installation of the corrugated tubes also make this design more practical and convenient in the actual construction process.

[0058] In summary, the design of connecting the bellows connector 1-7 and the threading connector 2-8 with the bellows, and the ultrasonic probe line 1-8 passing through the bellows to be electrically connected to the signal control module, not only meets the requirements of power construction for cable concealment, but also ensures the safety and reliability of the cable during transmission. This design is of great significance in practical applications.

[0059] Preferably, Figure 2 , Figure 7 As shown, A mounting back plate 2-13 is provided at the bottom of the box body 2-4.

[0060] The mounting back plate 2-13 is an important component of the bottom of the box body 2-4. It is usually a flat metal plate or a high-strength plastic plate, and is designed with holes or structures for mounting the clamp.

[0061] In actual installation, the clamp is wrapped around the column, and the hole position of the clamp is aligned with the hole position on the mounting back plate 2-13. Then, the clamp is fastened to the column with bolts and nuts to fix the box body 2-4 of the repeater 2.

[0062] In summary, a mounting back plate 2-13 is provided at the bottom of the box body 2-4, and the repeater 2 is fixed to an adjacent column by means of a clamp installation. This design not only ensures the stability and safety of the repeater 2, but also facilitates construction and maintenance.

[0063] Preferably, Figure 7 As shown, It also includes a digital board fixing plate 2-7 for fixing the oil level digital board 2-3, and the digital board fixing plate 2-7 is fixed to the box body 2-4 by bolts.

[0064] The digital board fixing plate 2-7 is a component specially designed to fix the oil level digital board 2-3. The digital board fixing plate 2-7 corresponds to the position of the transparent window 2-2 on the box body 2-4, so that the display information (distance and relative height percentage) on the oil level digital board 2-3 can be clearly displayed, which is convenient for directly observing the display content of the oil level digital board 2-3.

[0065] The digital board fixing plate 2-7 is fixed to the box body 2-4 by bolts. This fixing method has high strength and stability, and can ensure that the digital board fixing plate 2-7 will not loosen or deform during long-term use. The bolt connection is also easy to install and disassemble, which is convenient for replacing or maintaining the oil level digital board 2-3 when necessary.

[0066] In summary, the digital board fixing plate 2-7 is fixed to the box body 2-4 by bolts, ensuring that the oil level digital board 2-3 can stably and accurately display the oil level information, thereby helping the operator to timely understand the operating status of the equipment and take corresponding maintenance measures.

[0067] The control method of the transformer oil conservator oil level online monitoring device performs the following steps: Step 1: Installation; The ultrasonic transducer 1 is magnetically attached to the bottom or side of the outer wall of the oil pillow to be tested, and the repeater 2 is installed on a column adjacent to the ultrasonic transducer 1; Step 2: Control the emission of ultrasonic waves, receive the returned ultrasonic signals, and calculate the oil level of the transformer conservator; Transmitting ultrasonic signals: The signal control module controls ultrasonic sensors 1-3 to transmit ultrasonic signals into the transformer oil conservator. The ultrasonic signals will be reflected back when encountering the oil surface. Receiving returned ultrasonic signals: The signal control module controls ultrasonic sensors 1-3 to receive ultrasonic signals reflected from the oil surface. Since the propagation speed of ultrasonic waves in the air is known, the control module calculates the distance between the oil surface of the transformer oil conservator and ultrasonic sensors 1-3 by measuring the round-trip time of the ultrasonic signal. Calculate the oil level: Calculate the oil level in the transformer oil conservator according to the distance between the ultrasonic sensor 1-3 and the oil surface of the transformer oil conservator and the installation position of the ultrasonic sensor 1-3; Step 3: Data transmission: The communication module wirelessly uploads the oil level data of the transformer oil pillow to the background data center.

[0068] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention. These changes involve related technologies well known to those skilled in the art, which all fall within the scope of protection of the patent of the present invention.

[0069] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. Transformer oil conservator oil level online monitoring device, characterized in that: It comprises an ultrasonic transducer (1) and a repeater (2), wherein the ultrasonic transducer (1) and the repeater (2) are electrically connected; The ultrasonic transducer (1) comprises: A shell (1-1), wherein a spring (1-6) is provided in the shell (1-1), the upper end of the shell (1-1) is threadedly connected to a fixing cover (1-2), and the lower end of the shell (1-1) is threadedly connected to a bellows joint (1-7); A spring-pressing component (1-5), wherein the lower end of the spring-pressing component (1-5) is inserted into the inner ring of the upper part of the spring (1-6), the upper end of the spring-pressing component (1-5) is embedded in the ultrasonic sensor (1-3), and the spring-pressing component (1-5) is fixed to the housing (1-1) via a fixing cover (1-2); A fixed cover (1-2), wherein a circular hole is provided at the center of the fixed cover (1-2) for the ultrasonic sensor (1-3) to extend to the outside of the fixed cover (1-2), and an annular groove is also provided at the upper end of the fixed cover (1-2), and a magnet (1-4) is provided in the annular groove; An ultrasonic sensor (1-3), wherein an ultrasonic probe line (1-8) at the bottom of the ultrasonic sensor (1-3) passes through the housing (1-1) and is connected to the repeater (2); The repeater (2) comprises a box body (2-4), the box body (2-4) being hinged to a box cover (2-1), a lithium battery (2-6), a circuit board (2-5), and an oil level digital board (2-3) being arranged in the box body (2-4), a self-reset switch (2-9), a threading connector (2-8), a 4-core aviation plug (2-10), and a 6-core aviation plug (2-11) being arranged at the bottom of the box body (2-4), a 4G antenna (2-12) being arranged at the top of the box body (2-4), and a transparent window (2-2) being arranged on the box cover (2-1) at a position corresponding to the oil level digital board (2-3) for displaying the distance and the relative height percentage.

2. The transformer oil conservator oil level online monitoring device according to claim 1 is characterized in that: The spring-pressing component (1-5) comprises: An insulating gasket (1-51), wherein the insulating gasket (1-51) is arranged between the spring pressing piece (1-52) and the fixing piece (1-53); A spring pressing piece (1-52), wherein the bottom of the spring pressing piece (1-52) is provided with a convex edge corresponding to the inner ring of the spring (1-6) and is used for clamping into the inner ring of the spring (1-6); A fixing member (1-53), wherein an inner ring extending upward from the bottom of the fixing member (1-53) is provided with an annular groove for accommodating an insulating gasket (1-51), and the fixing member (1-53) is threadedly connected to the spring pressure member (1-52).

3. The transformer oil conservator oil level online monitoring device according to claim 2 is characterized in that: A long hole matching the spring (1-6) is provided inside the housing (1-1); the spring (1-6) extends to the outside of the long hole; an annular convex structure is provided inwardly at the bottom of the long hole; and the bottom end face of the spring (1-6) is supported on the annular convex.

4. The transformer oil conservator oil level online monitoring device according to any one of claims 1 to 3, characterized in that: The circuit board (2-5) comprises a control module, a signal control module, a communication module, a power module, and a temperature measurement module; The output ends of the signal control module, the power module and the temperature measurement module are connected to the control module, the output end of the control module is connected to the communication module, and the signal control module is electrically connected to the ultrasonic sensor (1-3).

5. The transformer oil conservator oil level online monitoring device according to claim 4 is characterized in that: The signal control module controls the transmitter of the ultrasonic sensor (1-3) to send ultrasonic waves; The signal control module controls the receiver of the ultrasonic sensor (1-3) to receive and process the returned ultrasonic signal.

6. The transformer oil conservator oil level online monitoring device according to claim 5 is characterized in that: The material of the spring pressing piece (1-52) and the fixing piece (1-53) is polytetrafluoroethylene; The insulating gasket (1-51) is a red steel paper gasket; Shockproof cotton is arranged between the fixing member (1-53) and the ultrasonic sensor (1-3).

7. The transformer oil conservator oil level online monitoring device according to claim 6 is characterized in that: The bellows joint (1-7) and the threading joint (2-8) are connected by means of a bellows, and the ultrasonic probe line (1-8) passes through the bellows and is electrically connected to the signal control module.

8. The transformer oil conservator oil level online monitoring device according to claim 7, characterized in that: A mounting back plate (2-13) is provided at the bottom of the box body (2-4).

9. The transformer oil conservator oil level online monitoring device according to claim 8, characterized in that: It also includes a digital board fixing plate (2-7) for fixing the oil level digital board (2-3), wherein the digital board fixing plate (2-7) is fixed to the box body (2-4) by means of bolts.

10. A control method for an online monitoring device for oil level of a transformer oil conservator, characterized in that: Using the transformer oil conservator oil level online monitoring device as described in any one of claims 1 to 9, perform the following steps: Step 1: Installation; the ultrasonic transducer (1) is magnetically attached to the bottom or side of the outer wall of the oil pillow to be tested, and the repeater (2) is installed on a column adjacent to the ultrasonic transducer (1); Step 2: Control the emission of ultrasonic waves, receive the returned ultrasonic signals, and calculate the oil level of the transformer conservator; Transmitting ultrasonic signals: The signal control module controls the ultrasonic sensors (1-3) to transmit ultrasonic signals into the transformer oil pillow. The ultrasonic signals will be reflected back when encountering the oil surface. Receiving the returned ultrasonic signal: the signal control module controls the ultrasonic sensor (1-3) to receive the ultrasonic signal reflected from the oil surface. Since the propagation speed of ultrasonic waves in the air is known, the control module calculates the distance between the oil surface of the transformer oil pillow and the ultrasonic sensor (1-3) by measuring the round-trip time of the ultrasonic signal; Calculating the oil level: Calculating the oil level in the transformer oil conservator according to the distance between the ultrasonic sensor (1-3) and the oil surface of the transformer oil conservator and the installation position of the ultrasonic sensor (1-3); Step 3: Data transmission: The communication module wirelessly uploads the oil level data of the transformer oil pillow to the background data center.

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