Transformer oil pillow oil level monitoring device and method based on double ultrasonic ranging

Abstract

The application discloses a transformer oil pillow oil level monitoring device and method based on double ultrasonic ranging, and belongs to the field of electrical equipment oil pressure monitoring. The device comprises a temperature monitoring unit for pre-judging the oil level of a transformer oil pillow; a first ultrasonic ranging unit arranged at the bottom of the outer wall of the transformer oil pillow for emitting a first ultrasonic signal into the oil pillow and receiving the reflected echo wave, and obtaining the transmission time of the first ultrasonic signal; a second ultrasonic ranging unit arranged at a preset position of the side edge of the outer wall of the transformer oil pillow for emitting a second ultrasonic signal into the oil pillow and receiving the reflected echo wave, and obtaining the reference sound speed of ultrasonic wave propagation in oil; and a host computer in communication connection with the first and second ultrasonic ranging units, for obtaining oil liquid surface height data representing the transformer oil pillow based on the reference sound speed and the transmission time of the first ultrasonic signal. The application adopts the ultrasonic ranging principle, is convenient to install, and can realize real-time and accurate monitoring of the oil level of the transformer oil pillow.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment oil pressure monitoring technology, and more specifically, relates to a transformer oil conservator oil level monitoring device and method based on dual ultrasonic ranging. Background Technology

[0002] Oil-filled electrical equipment is one of the most numerous and diverse pieces of equipment in the power grid. Larger examples include transformers, oil-immersed reactors, and instrument transformers, while smaller examples include bushings and oil-filled porcelain sleeves for cable terminals. Both excessively high and low oil levels in these devices pose safety hazards; therefore, implementing oil level monitoring is essential.

[0003] Currently, oil level monitoring in transformer conservator mainly employs two types of field level gauges: glass tube level gauges and pointer level gauges. Glass tube level gauges utilize the principle of communicating vessels, directly reflecting the oil level within the conservator onto the glass tube, making the oil level height readily apparent. Pointer level gauges employ a mechanical transmission principle; changes in oil level drive the pointer to rotate, indirectly displaying the oil level. Neither type of gauge has remote signal transmission capability, relying primarily on manual on-site visual inspection or telescope observation. For glass tube level gauges, the glass window is easily contaminated after operation, making it impossible to accurately determine the oil interface position within the conservator. For pointer level gauges, mechanical transmission failure, capsule rupture, and oil leakage often cause inaccurate oil level readings, resulting in "false oil level" phenomena. Equipment without level gauges primarily relies on manual inspection after a power outage. In summary, transformer conservatories are all closed containers; installing or maintaining existing level gauges requires power outages, drilling, and oil draining, making the operation complex.

[0004] Therefore, there is an urgent need for a non-contact transformer oil conservator level monitoring device with signal transmission capability and easy installation based on dual ultrasonic ranging. Summary of the Invention

[0005] In view of the shortcomings of the above or existing technologies, the present invention proposes a transformer oil conservator level monitoring device and method based on dual ultrasonic ranging, which realizes non-contact measurement of transformer oil conservator level and real-time accurate monitoring of transformer oil conservator level.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a transformer oil conservator level monitoring device based on dual ultrasonic ranging, comprising:

[0008] Temperature monitoring unit is used to pre-judge the oil level in the transformer oil conservator;

[0009] The first ultrasonic ranging unit is located at the bottom of the outer wall of the transformer oil conservator. It is used to transmit the first ultrasonic signal into the oil conservator and receive its reflected echo to obtain the transmission time of the first ultrasonic signal.

[0010] The second ultrasonic ranging unit is set at a preset position on the outer side of the transformer oil conservator. It is used to transmit a second ultrasonic signal into the oil conservator and receive its reflected echo to obtain the reference sound speed of ultrasonic waves propagating in the oil.

[0011] The host is communicatively connected to the first ultrasonic ranging unit and the second ultrasonic ranging unit, respectively, and acquires data characterizing the oil level height in the transformer oil conservator based on the reference sound velocity and the transmission time of the first ultrasonic signal.

[0012] As a further technical solution of the present invention, the temperature detection unit includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is integrated into a first ultrasonic ranging unit and the second temperature sensor is integrated into a second ultrasonic ranging unit.

[0013] As a further technical solution of the present invention, the first ultrasonic ranging unit and the second ultrasonic ranging unit are ultrasonic probes with the same structure; the ultrasonic probe includes:

[0014] Housing; ultrasonic transducer, disposed within the housing, for transmitting and receiving ultrasonic signals;

[0015] A mounting base is provided at the bottom of the housing;

[0016] The mounting base has an embedded annular permanent magnet for forming a magnetic adsorption structure.

[0017] As a further technical solution of the present invention, the housing is an integrated encapsulated structure, and the housing is filled with a shock-absorbing and damping material. The shock-absorbing and damping material covers the outer periphery of the ultrasonic transducer to suppress the interference of mechanical vibration on signal acquisition.

[0018] As a further technical solution of the present invention, the host includes:

[0019] shell;

[0020] The main control board is located inside the outer casing;

[0021] The display screen is embedded in the top of the housing and connected to the main control board. It is used to display the target oil level and percentage value.

[0022] The power supply is located inside the housing and is used to power the main control board, the first ultrasonic ranging unit, and the second ultrasonic ranging unit.

[0023] As a further technical solution of the present invention, the main control board integrates a microprocessor, an ultrasonic transmitter driver, and an ultrasonic echo receiver.

[0024] The microprocessor has a PWM signal generation port and an ADC signal acquisition port;

[0025] The input terminal of the ultrasonic transmitter driver is electrically connected to the PWM signal generation port, and the output terminal of the ultrasonic transmitter driver is electrically connected to the first ultrasonic ranging unit and the second ultrasonic ranging unit, respectively.

[0026] The input terminal of the ultrasonic echo receiver is electrically connected to the first ultrasonic ranging unit and the second ultrasonic ranging unit, respectively, and the output terminal of the ultrasonic echo receiver is electrically connected to the ADC signal acquisition port.

[0027] As a further technical solution of the present invention, a communication interface is also provided on the side of the housing. The communication interface includes a first transmitting interface for connecting the ultrasonic driver; a second receiving interface for connecting the ultrasonic receiver; a debugging interface for debugging; and a power supply interface for connecting to the first ultrasonic ranging unit and the second ultrasonic ranging unit.

[0028] Secondly, the present invention provides a method for monitoring the oil level of a transformer oil conservator based on dual ultrasonic ranging, comprising:

[0029] The installation location of the second ultrasonic ranging unit was verified;

[0030] When the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil tank, the second ultrasonic ranging unit emits a second ultrasonic signal into the oil tank and receives its reflected echo to obtain the reference sound speed of the ultrasonic wave propagating in the oil.

[0031] The first ultrasonic ranging unit, located at the bottom of the outer wall of the transformer oil conservator, transmits a first ultrasonic signal into the oil conservator and receives its reflected echo to obtain the transmission time of the first ultrasonic signal.

[0032] Based on the reference sound velocity and the transmission time of the first ultrasonic signal, the oil level height data in the transformer oil conservator is calculated and displayed.

[0033] As a further technical solution of the present invention, the verification of the installation position of the second ultrasonic ranging unit specifically includes:

[0034] The first temperature monitored by the first temperature sensor located in the first ultrasonic ranging unit and the second temperature monitored by the second temperature sensor located in the second ultrasonic ranging unit are obtained.

[0035] The difference between the first temperature and the second temperature is calculated. If the difference is within a set threshold, it is determined that the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil tank. If the difference is outside the set threshold, it is determined that the second ultrasonic ranging unit is located on the side wall above the oil level of the transformer oil tank.

[0036] As a further technical solution of the present invention, the verification of the installation position of the second ultrasonic ranging unit specifically includes:

[0037] Acquire the first temperature monitored by the first temperature sensor located within the first ultrasonic ranging unit;

[0038] The velocity of sound propagating in the transformer oil conservator is obtained based on the first temperature.

[0039] The first ultrasonic ranging unit transmits a first ultrasonic signal into the oil reservoir and receives its reflected echo to obtain the transmission time of the first ultrasonic signal.

[0040] Calculate oil level based on sound propagation speed and transmission time;

[0041] If the installation height of the second ultrasonic ranging unit is less than the oil level, then it is determined that the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil conservator.

[0042] The beneficial effects of this invention are as follows:

[0043] 1. This invention uses a temperature monitoring unit for pre-judgment, and then uses a first ultrasonic ranging unit and a second ultrasonic ranging unit for precise position calculation to obtain the accurate height of the transformer oil level. The second ultrasonic ranging unit provides the reference sound velocity of the oil in the transformer oil level tank, preventing measurement deviations caused by temperature changes and improving the accuracy of oil level measurement.

[0044] 2. This invention adopts the principle of ultrasonic ranging, which does not require disassembly of the transformer oil tank, the measurement method is simple, the installation is convenient, and there is no need for power outage, drilling or oil draining operations. It is practical, easy to operate, and has high measurement efficiency.

[0045] 3. This invention relates to a transformer oil conservator level monitoring device based on dual ultrasonic ranging. Utilizing the principle of ultrasonic ranging, it measures the oil level inside the oil conservator from the outside, achieving non-contact measurement of the transformer oil conservator level. The ultrasonic sensors are installed directly below and to the side of the outer wall of the oil conservator being measured, eliminating the need for drilling holes in the conservator. This method is simple to install, convenient to operate, and safe and reliable. The sensors upload the measurement data to the host computer via digital communication, enabling real-time and accurate monitoring of the transformer oil conservator level. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 A structural diagram of the transformer oil conservator level monitoring device based on dual ultrasonic ranging provided by the present invention;

[0048] Figure 2 This invention provides an installation structure diagram of a transformer oil conservator level monitoring device based on dual ultrasonic ranging;

[0049] Figure 3 This is a structural diagram of the first ultrasonic ranging unit provided by the present invention;

[0050] Figure 4 This is a front view of the first ultrasonic ranging unit provided by the present invention;

[0051] Figure 5 The host structure diagram provided for this invention;

[0052] Figure 6 This invention provides a host open state structure diagram;

[0053] Figure 7 A flowchart of the transformer oil conservator level monitoring method based on dual ultrasonic ranging provided by the present invention;

[0054] As shown in the figure:

[0055] 10-Temperature monitoring unit; 20-First ultrasonic ranging unit; 30-Second ultrasonic ranging unit; 40-Main unit; 101-First temperature sensor; 102-Second temperature sensor; 201-Housing; 202-Ultrasonic transducer; 203-Mounting base; 204-Ring permanent magnet; 401-Outer shell; 402-Main control board; 403-Display screen; 404-Power supply; 411-First transmitting interface; 412-Second receiving interface; 413-Debugging interface; 414-Power supply interface; 421-Microprocessor; 422-Ultrasonic transmitting driver; 423-Ultrasonic echo receiver. Detailed Implementation

[0056] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0058] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms as used in this disclosure, mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, but do not exclude other elements or objects. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. It should be noted that the embodiments of the present invention can be applied to any applicable scenario.

[0060] See Figure 1 and Figure 2 This invention provides a transformer oil conservator level monitoring device based on dual ultrasonic ranging, comprising:

[0061] Temperature monitoring unit 10 is used to pre-judge the oil level of transformer oil conservator A;

[0062] The first ultrasonic ranging unit 20 is disposed at the bottom of the outer wall of the transformer oil conservator A, and is used to transmit the first ultrasonic signal into the oil conservator and receive its reflected echo to obtain the transmission time of the first ultrasonic signal.

[0063] The second ultrasonic ranging unit 30 is set at a preset position on the outer wall side of the transformer oil conservator A. It is used to transmit a second ultrasonic signal into the oil conservator and receive its reflected echo to obtain the reference sound speed of ultrasonic waves propagating in the oil.

[0064] The host 40 is communicatively connected to the first ultrasonic ranging unit 20 and the second ultrasonic ranging unit 30, respectively, and acquires data characterizing the oil level height in the transformer oil conservator based on the reference sound velocity and the transmission time of the first ultrasonic signal.

[0065] See Figure 2This invention uses a temperature monitoring unit to pre-judge the oil level in the transformer oil conservator, ensuring that the second ultrasonic ranging unit is installed on the side wall below the oil level. If the second ultrasonic ranging unit is installed above the oil level, it indicates that the oil level is too low, and an alarm is triggered. The second ultrasonic ranging unit is typically installed 10cm above the outer wall of the transformer oil conservator. The temperature monitoring unit performs the pre-judgment, and then the first and second ultrasonic ranging units are used for precise position calculation to obtain the accurate oil level. The second ultrasonic ranging unit provides a reference sound velocity in the oil within the transformer oil conservator, preventing measurement deviations caused by temperature changes and improving the accuracy of oil level measurement.

[0066] This invention uses the principle of ultrasonic ranging, which does not require disassembly of the transformer oil tank, has a simple measurement method, is easy to install, and does not require power outages, drilling, or oil draining. It is practical, easy to operate, and has high measurement efficiency.

[0067] The temperature detection unit 10 provided by the present invention includes a first temperature sensor 101 and a second temperature sensor 102. The first temperature sensor 101 is integrated into a first ultrasonic ranging unit, and the second temperature sensor 102 is integrated into a second ultrasonic ranging unit.

[0068] The temperature detection unit is used to predict the oil level. The first temperature detection unit measures the temperature of the outer wall of the oil conservator at the installation location of the first ultrasonic ranging unit, and the second temperature detection unit measures the temperature of the outer wall of the oil conservator at the installation location of the second ultrasonic ranging unit. Since the velocity of sound in transformer oil changes with temperature, the velocity of sound in the oil can be obtained by measuring the temperature of the transformer oil. Because the measured temperature is the temperature of the outer wall of the transformer oil conservator, there is a certain error compared with the oil temperature inside the conservator. Therefore, ultrasonic ranging is used to measure the velocity of sound in the oil to achieve accurate calculation of the oil level.

[0069] See Figure 3 and Figure 4 The first ultrasonic ranging unit 20 and the second ultrasonic ranging unit 30 provided by the present invention are ultrasonic probes with the same structure; the ultrasonic probe includes: a housing 201; an ultrasonic transducer 202, which is disposed in the housing 201 and is used to realize the transmission and reception of ultrasonic signals; a mounting base 203 is provided at the bottom of the housing 201; a ring permanent magnet 204 is embedded in the mounting base 203 to form a magnetic adsorption structure.

[0070] The ultrasonic probe adopts a magnetic adsorption structure for easy installation. At the same time, the bellows connected to the ultrasonic probe can be fixed to the bottom of the oil tank by a magnetic snap ring, making installation and operation convenient. The housing 201 is an integrated glue-sealed structure, and the housing is filled with shock-absorbing and damping material. The shock-absorbing and damping material covers the outer periphery of the ultrasonic transducer to suppress the interference of mechanical vibration on signal acquisition.

[0071] See Figure 5 and Figure 6 The host 40 provided by the present invention includes:

[0072] Casing 401;

[0073] The main control board 402 is disposed inside the outer casing 401;

[0074] Display screen 403 is embedded in the top of housing 401 and connected to the main control board. It is used to display the target oil level height and percentage value.

[0075] The power supply 404 is located inside the housing 401 and is used to supply power to the main control board 402, the first ultrasonic ranging unit 20 and the second ultrasonic ranging unit 30.

[0076] The main unit is mounted around the transformer via a casing. It receives detection signals from the temperature detection unit, the first ultrasonic ranging unit, and the second ultrasonic ranging unit. The main control board analyzes and calculates the data to obtain oil level and percentage information, which is displayed on a screen. The power supply can be either built-in or external; this invention does not impose any restrictions. The main unit is responsible for transmitting and receiving ultrasonic signals, calculating the oil level, and outputting the measurement results via digital communication. It also performs automatic sound velocity calibration to improve measurement accuracy.

[0077] The main control board 402 integrates a microprocessor 421, an ultrasonic transmitter driver 422, and an ultrasonic echo receiver 423.

[0078] The microprocessor 421 has a PWM signal generation port and an ADC signal acquisition port;

[0079] The input terminal of the ultrasonic transmitter driver 422 is electrically connected to the PWM signal generation port, and the output terminal of the ultrasonic transmitter driver is electrically connected to the first ultrasonic ranging unit 20 and the second ultrasonic ranging unit 30, respectively.

[0080] The input terminal of the ultrasonic echo receiver 423 is electrically connected to the first ultrasonic ranging unit 20 and the second ultrasonic ranging unit 30, respectively, and the output terminal of the ultrasonic echo receiver 423 is electrically connected to the ADC signal acquisition port.

[0081] The side of the main unit's housing 401 is also provided with a communication interface, which includes a first transmitting interface 411 for connecting an ultrasonic driver; a second receiving interface 412 for connecting an ultrasonic receiver; a debugging interface 413 for debugging; and a power supply interface 414 for connecting to a first ultrasonic ranging unit and a second ultrasonic ranging unit.

[0082] See Figure 7 This invention provides a method for monitoring transformer oil level based on dual ultrasonic ranging, comprising:

[0083] Step S1: Verify the installation position of the second ultrasonic ranging unit;

[0084] Step S2: When the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil tank, the second ultrasonic ranging unit emits a second ultrasonic signal into the oil tank and receives its reflected echo to obtain the reference sound speed of the ultrasonic wave propagating in the oil.

[0085] Step S3: The first ultrasonic ranging unit, located at the bottom of the outer wall of the transformer oil conservator, transmits a first ultrasonic signal into the oil conservator and receives its reflected echo to obtain the transmission time of the first ultrasonic signal.

[0086] Step S4: Based on the reference sound velocity and the transmission time of the first ultrasonic signal, calculate and display the data characterizing the oil level height in the transformer oil conservator.

[0087] In step S1, the installation position of the second ultrasonic ranging unit is verified; specifically, this includes:

[0088] The first temperature monitored by the first temperature sensor located in the first ultrasonic ranging unit and the second temperature monitored by the second temperature sensor located in the second ultrasonic ranging unit are obtained.

[0089] The difference between the first temperature and the second temperature is calculated. If the difference is within a set threshold, it is determined that the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil tank. If the difference is outside the set threshold, it is determined that the second ultrasonic ranging unit is located on the side wall above the oil level of the transformer oil tank.

[0090] The present invention also provides another embodiment for step S1, specifically, verifying the installation position of the second ultrasonic ranging unit; specifically including:

[0091] Acquire the first temperature monitored by the first temperature sensor located within the first ultrasonic ranging unit;

[0092] The velocity of sound propagating in the transformer oil conservator is obtained based on the first temperature.

[0093] The first ultrasonic ranging unit transmits a first ultrasonic signal into the oil reservoir and receives its reflected echo to obtain the transmission time of the first ultrasonic signal.

[0094] Calculate oil level based on sound propagation speed and transmission time;

[0095] If the installation height of the second ultrasonic ranging unit is less than the oil level, then it is determined that the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil conservator.

[0096] The temperature sensor of this invention performs temperature measurement through a temperature measurement circuit, used to obtain the sound velocity at the monitored temperature and pre-determine the installation position of the second ultrasonic ranging unit. The microprocessor uses a PWM function pin to generate a pulse train signal, which is boosted by the transmitting circuit to drive the ultrasonic transducer, causing the transducer to generate mechanical waves. One end of the ultrasonic transducer's receiving circuit is connected to the probe, receiving and amplifying the echo signal and connecting it to the microprocessor's ADC port to complete signal acquisition. The display screen displays and outputs signals via a serial port, showing measured values, including oil level and percentage values. Signal outputs include RS-485 output and wireless signal output. A power supply powers the entire system. The main unit includes ultrasonic signal transmitters, receivers, and temperature acquisition units. The measurement section is the core module of the product, responsible for signal transmission and reception, data processing, temperature acquisition, and compensation.

[0097] The transformer oil conservator level monitoring device based on dual ultrasonic ranging provided by this invention adopts a split structure design, consisting of an ultrasonic probe and a main unit; the ultrasonic probe and the main unit are connected by a shielded cable. The ultrasonic probe adopts an integrated encapsulated structure design, with a built-in ultrasonic transducer and temperature sensor. The probe mounting base is made of metal and has an embedded ring-shaped neodymium magnet.

[0098] The ultrasonic transducer of this invention adopts a piezoelectric transducer, which utilizes the piezoelectric effect to achieve energy conversion. It has high electromechanical conversion efficiency, is easy to mold, has a small size, and strong anti-electromagnetic interference capability.

[0099] This invention relates to a transformer oil conservator level monitoring device based on dual ultrasonic ranging. Utilizing the principle of ultrasonic ranging, it measures the oil level inside the conservator from the outside, achieving non-contact measurement of the transformer oil conservator level. The ultrasonic sensors are installed directly below and to the side of the outer wall of the conservator being measured, eliminating the need for drilling holes in the conservator. This method is simple to install, convenient to operate, and safe and reliable. The sensors upload the measurement data to the host computer via digital communication, enabling real-time and accurate monitoring of the transformer oil conservator level.

[0100] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A transformer oil conservator level monitoring device based on dual ultrasonic ranging, characterized in that, include: Temperature monitoring unit is used to pre-judge the oil level in the transformer oil conservator; The first ultrasonic ranging unit is located at the bottom of the outer wall of the transformer oil conservator. It is used to transmit the first ultrasonic signal into the oil conservator and receive its reflected echo to obtain the transmission time of the first ultrasonic signal. The second ultrasonic ranging unit is set at a preset position on the outer side of the transformer oil conservator. It is used to transmit a second ultrasonic signal into the oil conservator and receive its reflected echo to obtain the reference sound speed of ultrasonic waves propagating in the oil. The host is communicatively connected to the first ultrasonic ranging unit and the second ultrasonic ranging unit, respectively, and acquires data characterizing the oil level height in the transformer oil conservator based on the reference sound velocity and the transmission time of the first ultrasonic signal.

2. The transformer oil conservator level monitoring device based on dual ultrasonic ranging according to claim 1, characterized in that, The temperature detection unit includes a first temperature sensor and a second temperature sensor. The first temperature sensor is integrated into a first ultrasonic ranging unit, and the second temperature sensor is integrated into a second ultrasonic ranging unit.

3. The transformer oil conservator level monitoring device based on dual ultrasonic ranging according to claim 1, characterized in that, The first ultrasonic ranging unit and the second ultrasonic ranging unit are ultrasonic probes with identical structures; the ultrasonic probe includes: Housing; ultrasonic transducer, disposed within the housing, for transmitting and receiving ultrasonic signals; A mounting base is provided at the bottom of the housing; The mounting base has an embedded annular permanent magnet for forming a magnetic adsorption structure.

4. The transformer oil conservator level monitoring device based on dual ultrasonic ranging according to claim 3, characterized in that, The housing is an integrated encapsulated structure, and the housing is filled with shock-absorbing and damping material. The shock-absorbing and damping material covers the outer periphery of the ultrasonic transducer to suppress the interference of mechanical vibration on signal acquisition.

5. The transformer oil conservator level monitoring device based on dual ultrasonic ranging according to claim 1, characterized in that, The host includes: shell; The main control board is located inside the outer casing; The display screen is embedded in the top of the housing and connected to the main control board. It is used to display the target oil level and percentage value. The power supply is located inside the housing and is used to power the main control board, the first ultrasonic ranging unit, and the second ultrasonic ranging unit.

6. The transformer oil conservator level monitoring device based on dual ultrasonic ranging according to claim 5, characterized in that, The main control board integrates a microprocessor, an ultrasonic transmitter driver, and an ultrasonic echo receiver. The microprocessor has a PWM signal generation port and an ADC signal acquisition port; The input terminal of the ultrasonic transmitter driver is electrically connected to the PWM signal generation port, and the output terminal of the ultrasonic transmitter driver is electrically connected to the first ultrasonic ranging unit and the second ultrasonic ranging unit, respectively. The input terminal of the ultrasonic echo receiver is electrically connected to the first ultrasonic ranging unit and the second ultrasonic ranging unit, respectively, and the output terminal of the ultrasonic echo receiver is electrically connected to the ADC signal acquisition port.

7. The transformer oil conservator level monitoring device based on dual ultrasonic ranging according to claim 5, characterized in that, The side of the housing is also provided with a communication interface, which includes a first transmitting interface for connecting to the ultrasonic driver; a second receiving interface for connecting to the ultrasonic receiver; a debugging interface for debugging; and a power supply interface for connecting to the first ultrasonic ranging unit and the second ultrasonic ranging unit.

8. A method for monitoring transformer oil level in a transformer oil conservator based on dual ultrasonic ranging, characterized in that, The transformer oil conservator level monitoring device based on dual ultrasonic ranging as described in any one of claims 1-7 includes: The installation location of the second ultrasonic ranging unit was verified; When the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil tank, the second ultrasonic ranging unit emits a second ultrasonic signal into the oil tank and receives its reflected echo to obtain the reference sound speed of the ultrasonic wave propagating in the oil. The first ultrasonic ranging unit, located at the bottom of the outer wall of the transformer oil conservator, transmits a first ultrasonic signal into the oil conservator and receives its reflected echo to obtain the transmission time of the first ultrasonic signal. Based on the reference sound velocity and the transmission time of the first ultrasonic signal, the oil level height data in the transformer oil conservator is calculated and displayed.

9. The method for monitoring transformer oil level based on dual ultrasonic ranging according to claim 8, characterized in that, The verification of the installation location of the second ultrasonic ranging unit specifically includes: The first temperature monitored by the first temperature sensor located in the first ultrasonic ranging unit and the second temperature monitored by the second temperature sensor located in the second ultrasonic ranging unit are obtained. The difference between the first temperature and the second temperature is calculated. If the difference is within a set threshold, it is determined that the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil conservator. If the difference is outside the set threshold, it is determined that the second ultrasonic ranging unit is located on the side wall above the oil level of the transformer oil conservator.

10. The method for monitoring transformer oil level based on dual ultrasonic ranging according to claim 8, characterized in that, The verification of the installation location of the second ultrasonic ranging unit specifically includes: Acquire the first temperature monitored by the first temperature sensor located within the first ultrasonic ranging unit; The velocity of sound propagating in the transformer oil conservator is obtained based on the first temperature. The first ultrasonic ranging unit transmits a first ultrasonic signal into the oil reservoir and receives its reflected echo to obtain the transmission time of the first ultrasonic signal. Calculate oil level based on sound propagation speed and transmission time; If the installation height of the second ultrasonic ranging unit is less than the oil level, then it is determined that the second ultrasonic ranging unit is located on the side wall below the oil level of the transformer oil conservator.

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