Accuracy checking device, method and equipment for oil-filled submarine cable flowmeter and storage medium

Abstract

The invention discloses a submarine cable flowmeter accuracy verification device, method and equipment and a storage medium, and relates to the technical field of flow measurement and submarine cable maintenance. The device comprises a non-intrusive flow velocity detection module, a signal processing module, a compensation module, a main control calculation module and a display module. According to the method, the ultrasonic transducer is installed in a non-invasive mode, ultrasonic downstream and countercurrent propagation time is collected, the actual flow velocity of fluid is calculated in combination with a temperature and pressure compensation coefficient, and the actual flow velocity is compared with a measured value of a flowmeter to be verified to achieve accuracy verification. The non-intrusive design is adopted, the flowmeter does not need to be disassembled or a pipeline structure does not need to be damaged, and the problems that spare parts are insufficient, the safety risk is high, and the system is interrupted in a traditional verification method are solved; through an ultrasonic propagation velocity difference method and a multi-parameter compensation technology, it is ensured that the verification precision is within + / -1%, multi-position cyclic verification can be achieved through the modular and portable design of the device, the verification efficiency and adaptability are greatly improved, and safe and stable operation of submarine cables is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow measurement and submarine cable maintenance, and particularly relates to an oil-filled submarine cable flowmeter accuracy verification device, method, equipment and storage medium. BACKGROUND

[0002] In a regional networking system and other high-voltage power transmission projects, the safe operation of 500kV oil-filled submarine cables is directly related to the stability of regional power supply, and the flow rate of the internal insulating oil is a key indicator for judging whether the cable is damaged. As the core equipment for flow rate measurement, the accuracy of the flowmeter directly affects the reliability of operation and maintenance decisions.

[0003] The existing verification methods for submarine cable flowmeters mainly include disassembly and inspection and spare part replacement: disassembly and inspection requires the flowmeter to be disassembled from the pipeline and sent to a professional testing institution, which can ensure the verification accuracy, but has significant defects; spare part replacement realizes verification of the original equipment by replacing the standby flowmeter, ensuring continuous operation of the system, but also faces many problems. Specifically, the deficiencies of the prior art are as follows:

[0004] Insufficient spare parts limit: usually only two flowmeter spare parts are configured on site, and three-phase submarine cables need to verify three sensors at the same time, which cannot achieve comprehensive coverage;

[0005] Safety risk is prominent: the disassembly process needs to break the oil circuit, which is easy to cause air and impurities to enter the pipeline and mix into the submarine cable, causing safety accidents such as insulation performance degradation and partial discharge;

[0006] System operation is interrupted: the three-phase submarine cable needs to be isolated during disassembly, and the oil supply of the oil pump station is interrupted, which may cause cable overheating damage and affect power transmission stability;

[0007] High operating cost: the disassembly and installation process is complex and requires professional technical personnel to operate, which takes a long time and has high labor and time costs;

[0008] Verification cycle is lagging: due to the complexity of operation and safety risks, the flowmeter is difficult to be verified regularly, and has been in an uncalibrated state for a long time, so the reliability of the measurement data cannot be guaranteed.

[0009] The traditional verification method relies on invasive operation or spare part replacement, and cannot solve the core demand of non-invasive online verification. In the existing flow measurement technology, electromagnetic flowmeters, mechanical flowmeters and other devices cannot adapt to the special working conditions of submarine cables, therefore, an online verification technology that does not need to be disassembled, is safe and efficient, and has reliable accuracy is urgently needed to overcome the many defects of the existing technology. SUMMARY

[0010] The purpose of this invention is to provide an accuracy calibration device and method for oil-filled submarine cable flow meters, so as to solve the problems of insufficient spare parts, high safety risks, system interruption, complex operation and long calibration cycle of existing calibration methods, and realize non-invasive online accurate calibration.

[0011] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0012] The first aspect of the present invention provides an accuracy calibration device for an oil-filled submarine cable flowmeter, comprising:

[0013] A non-invasive flow velocity detection module is used to transmit ultrasonic waves into the duct of a submarine cable and receive the ultrasonic signals after they have been propagated through the fluid.

[0014] The signal processing module is communicatively connected to the non-invasive flow velocity detection module and is used to filter, amplify, and digitize the ultrasonic signal to output ultrasonic propagation time data.

[0015] The compensation module is used to collect the temperature and pressure parameters of the fluid in the pipeline in real time and generate fluid state compensation coefficients.

[0016] The main control calculation module is electrically connected to the signal processing module and the compensation module respectively. It is used to calculate the actual flow velocity of the fluid based on the ultrasonic propagation time data. The main control calculation module calibrates the actual flow velocity of the fluid in combination with the fluid state compensation coefficient, and compares and analyzes the calibrated actual flow velocity with the measured value of the flow meter to be calibrated to obtain the accuracy verification result.

[0017] The display module is communicatively connected to the main control computing module and is used to visually output the accuracy verification results.

[0018] As a further improvement to the technical solution of the present invention, the non-invasive flow velocity detection module includes at least one pair of ultrasonic transducers. The ultrasonic transducers are symmetrically installed on the outside of a straight pipe section adjacent to the flow meter to be calibrated. The installation angle of each ultrasonic transducer with respect to the pipe axis is [insert angle here]. Furthermore, the axis of the ultrasonic beam intersects the axis of the pipe in the central region of the pipe.

[0019] As a further improvement to the technical solution of the present invention, the signal processing module includes a preamplifier circuit, a bandpass filter circuit, and an analog-to-digital converter unit. The preamplifier circuit is constructed using a KTA333-ST5 transistor, and the bandpass filter circuit consists of capacitors C100nF-C470nF and resistors. The analog-to-digital conversion unit is integrated into the microcontroller chip of the main control computing module.

[0020] As a further improvement to the technical solution of the present invention, the compensation module includes a temperature sensor and a pressure sensor. The temperature sensor is a PT100 platinum resistance sensor, and the pressure sensor is a diffused silicon pressure sensor. Both the temperature sensor and the pressure sensor are attached to the outer wall of the pipe through a waterproof encapsulation structure, and a thermally and electrically conductive gasket is provided between them and the outer wall of the pipe.

[0021] As a further improvement to the technical solution of this invention, the main control computing module uses a GD32F103C8T6 microcontroller as the core control unit, and the actual flow velocity of the fluid is calculated using the following formula:

[0022] ;

[0023] Where v is the actual flow velocity of the fluid, and L is the propagation path length of the ultrasonic wave within the pipe. The angle between the ultrasonic beam and the pipe axis. The time for ultrasound to travel downstream is denoted as . This represents the ultrasonic wave's back-current propagation time.

[0024] As a further improvement to the technical solution of the present invention, the accuracy calibration device for oil-filled submarine cable flowmeter also includes a power supply module. The power supply module includes an LMR14050 step-down chip, an AMS1117-3.3 voltage regulator chip, and a filter capacitor bank. The filter capacitor bank includes a 100nF ceramic capacitor and a 100uF electrolytic capacitor, which are used to convert the input 24V DC voltage into 5V and 3.3V stable voltages to power each module.

[0025] As a further improvement to the technical solution of the present invention, the non-invasive flow velocity detection module, signal processing module, compensation module, main control calculation module and display module are all encapsulated in a waterproof and corrosion-resistant shell. The shell material is 316L stainless steel, and the accuracy calibration device for the oil-filled submarine cable flow meter is equipped with an adjustable portable mounting bracket. The adjustable portable mounting bracket is made of high-strength aluminum alloy and is equipped with rubber anti-slip pads.

[0026] A second aspect of the present invention provides a method for calibrating the accuracy of an oil-filled submarine cable flowmeter, comprising the following steps:

[0027] It transmits ultrasonic waves into the duct of the submarine cable and receives the ultrasonic signals after they have propagated through the fluid.

[0028] The ultrasonic signal is filtered, amplified, and digitized to output ultrasonic propagation time data;

[0029] Real-time acquisition of temperature and pressure parameters of fluid in the pipeline to generate fluid state compensation coefficient;

[0030] The actual fluid velocity is calculated based on the ultrasonic propagation time data, and the actual fluid velocity is calibrated by combining the fluid state compensation coefficient. The calibrated actual fluid velocity is then compared and analyzed with the measured value of the flow meter to be calibrated to obtain the accuracy verification result.

[0031] The accuracy verification results are then visualized and output.

[0032] As a further improvement to the technical solution of the present invention, the operating frequency of the ultrasonic transducer is adaptively adjusted within the range of 0.5-2MHz according to the pipe material and fluid properties, and the accuracy of each set of propagation time data is optimized by averaging multiple acquisitions.

[0033] As a further improvement to the technical solution of the present invention, the compensation coefficient is generated by a temperature-pressure-velocity of sound mapping model, which is based on the physical properties of the insulating oil in the pipeline and supports updating the model parameters through the AT24C02 memory chip.

[0034] A third aspect of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the above-described method for verifying the accuracy of an oil-filled submarine cable flowmeter.

[0035] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for verifying the accuracy of an oil-filled submarine cable flowmeter.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] This invention integrates a non-invasive flow velocity detection module, a signal processing module, a compensation module, a main control calculation module, and a display module to construct a complete online calibration system that does not require disassembling the flow meter or damaging the pipeline structure. Its core advantage lies in its non-invasive design, which fundamentally avoids the safety risks of oil contamination and air ingress caused by traditional disassembly calibration. Simultaneously, it does not require interruption of the oil pump station's oil supply, ensuring the continuous and safe operation of the submarine cable. The compensation module collects temperature and pressure parameters in real time to generate compensation coefficients, correcting for the impact of environmental changes on the ultrasonic wave propagation speed. Combined with the main control calculation module's accurate flow velocity calculation and comparative analysis based on the propagation speed difference method, it effectively solves the pain points of traditional methods, such as insufficient spare parts, complex operation, and long calibration cycles. It enables flexible calibration of multiple flow meters while ensuring calibration accuracy within ±1%, providing reliable flow data support for submarine cable operation and maintenance, and combining safety, efficiency, and reliability.

[0038] This invention utilizes a non-invasive, fixed ultrasonic transducer, avoiding system interruptions and safety hazards associated with traditional disassembly operations. Real-time acquisition of compensation parameters and flow velocity calibration eliminate interference from temperature and pressure fluctuations on measurement accuracy. Alternating acquisition, optimized processing, and precise comparison of ultrasonic signals ensure the reliability of actual flow velocity calculations and accuracy assessments. The entire calibration process requires no complex operations by professional personnel, and the calibration time for a single flowmeter is short (no more than 5 minutes). This not only solves the problems of reliance on spare parts, cumbersome operations, and long cycles associated with traditional methods, but also provides intuitive visualization of calibration results, significantly improving maintenance efficiency. Simultaneously, it ensures the normal oil supply and stable operation of submarine cables during calibration, providing efficient and reliable data support for the maintenance decisions of high-voltage power transmission systems. Attached Figure Description

[0039] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0040] Figure 1 This is a schematic flowchart illustrating the framework of an accuracy verification method for an oil-filled submarine cable flowmeter according to an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of a module framework for accuracy verification of an oil-filled submarine cable flowmeter according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the composition of a computing device according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the preamplifier circuit and bandpass filter circuit in an embodiment of the present invention;

[0044] Figure 5 This is a control circuit diagram of the main control computing module in an embodiment of the present invention;

[0045] Figure 6 This is a diagram of a step-down circuit according to an embodiment of the present invention;

[0046] Figure 7 This is a voltage regulator circuit diagram according to an embodiment of the present invention;

[0047] Figure 8 This is a filter circuit diagram according to an embodiment of the present invention. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0049] The present invention will be further described in detail below with reference to the accompanying drawings.

[0050] Reference Figure 2 In a first aspect, this embodiment provides an accuracy calibration device for an oil-filled submarine cable flowmeter, comprising:

[0051] A non-invasive flow velocity detection module is used to transmit ultrasonic waves into the duct of a submarine cable and receive the ultrasonic signals after they have been propagated through the fluid.

[0052] The signal processing module is communicatively connected to the non-invasive flow velocity detection module and is used to filter, amplify, and digitize the ultrasonic signal to output ultrasonic propagation time data.

[0053] The compensation module is used to collect the temperature and pressure parameters of the fluid in the pipeline in real time and generate fluid state compensation coefficients.

[0054] The main control calculation module is electrically connected to the signal processing module and the compensation module respectively. It is used to calculate the actual flow velocity of the fluid based on the ultrasonic propagation time data. The main control calculation module calibrates the actual flow velocity of the fluid in combination with the fluid state compensation coefficient, and compares and analyzes the calibrated actual flow velocity with the measured value of the flow meter to be calibrated to obtain the accuracy verification result.

[0055] The display module is communicatively connected to the main control computing module and is used to visually output the accuracy verification results.

[0056] It should be noted that the non-invasive flow velocity detection module, as the core detection component, emits ultrasonic waves into the submarine cable's conduit and receives the ultrasonic signals propagating through the fluid within the conduit. The entire process requires no direct contact with the fluid and does not damage the conduit structure. The signal processing module establishes a communication connection with the non-invasive flow velocity detection module, referring to... Figure 8The filtering circuit shown sequentially filters the received weak ultrasonic signal to remove environmental noise, amplifies it to enhance signal strength, and digitizes it to convert it into a calculable electrical signal, ultimately outputting ultrasonic propagation time data. The compensation module collects the temperature and pressure parameters of the fluid in the pipeline in real time, and generates a fluid state compensation coefficient based on a preset fluid physical characteristic model to correct the influence of temperature and pressure changes on ultrasonic propagation speed. The main control computing module establishes electrical connections with the signal processing module and the compensation module respectively. First, based on the ultrasonic propagation time data, it calculates the initial actual flow velocity of the fluid using the ultrasonic propagation speed difference method, and then calibrates the initial actual flow velocity using the compensation coefficient to obtain an accurate final actual flow velocity. Subsequently, it calls the measurement value of the flow meter to be calibrated, and performs a comparative analysis by calculating the relative error and accuracy level of the two to generate an accuracy verification result. The display module communicates with the main control computing module to output the accuracy verification result and related parameters such as ultrasonic propagation time and fluid temperature and pressure in a visual form, which is convenient for maintenance personnel to view and record.

[0057] This device, through its non-invasive design, fundamentally avoids the safety risks of oil contamination and air ingress into pipelines caused by traditional disassembly and calibration methods. Simultaneously, it does not require interruption of the oil supply system of the submarine cable oil pump station, ensuring the safe and stable operation of the cable during calibration. The compensation module effectively eliminates the interference of temperature and pressure fluctuations on measurement accuracy. Combined with the precise calculations of the main control module, the calibration accuracy can reach within ±1%, meeting industry standards for flowmeter accuracy calibration. The collaborative work of each module solves the problems of insufficient spare parts, complex operation, and long calibration cycles associated with traditional calibration methods. One device can perform roving calibration of multiple flowmeters, significantly improving calibration efficiency and providing reliable data support for submarine cable operation and maintenance decisions.

[0058] In some embodiments, the non-invasive flow velocity detection module includes at least one pair of ultrasonic transducers. Each pair of ultrasonic transducers is symmetrically installed outside a straight pipe section adjacent to the flow meter to be calibrated. The installation angle of each ultrasonic transducer with respect to the pipe axis is [insert angle here]. Furthermore, the axis of the ultrasonic beam intersects the axis of the pipe in the central region of the pipe.

[0059] Specifically, ultrasonic transducers are configured in pairs, symmetrically installed on the outside of a straight pipe section adjacent to the flowmeter to be calibrated. Selecting a straight pipe section for installation avoids interference from pipe bends, valves, and other structures on the fluid flow field, ensuring that the measured object is fluid in a stable flow field; the installation angle is controlled within... to Within a certain range, and by adjusting the installation posture so that the axis of the ultrasonic beam intersects the axis of the pipe in the central region of the pipe, this angle range and beam coverage position ensure that the ultrasonic beam can penetrate the mainstream fluid region inside the pipe, rather than the low-velocity flow layer near the pipe wall, thereby accurately acquiring the ultrasonic propagation signal that reflects the true flow velocity of the fluid. By limiting the symmetrical installation method, installation angle, and beam coverage range of the ultrasonic transducer, the interference of the pipe structure on the fluid flow field is effectively reduced, avoiding deviations in the ultrasonic propagation path caused by improper installation, ensuring the accuracy of ultrasonic propagation time measurements in both upstream and downstream directions, and providing accurate raw data for subsequent calculations of the actual fluid flow velocity. At the same time, this installation method does not require modification of the pipe and can be adapted to submarine cable pipes of different diameters, enhancing the adaptability of the device to complex on-site conditions and further expanding the applicability of the device.

[0060] Reference Figure 4 In some embodiments, the signal processing module includes a preamplifier circuit, a bandpass filter circuit, and an analog-to-digital converter unit. The preamplifier circuit is constructed using a KTA333-ST5 transistor, and the bandpass filter circuit consists of capacitors C100nF-C470nF and resistors. The analog-to-digital conversion unit is integrated into the microcontroller chip of the main control computing module.

[0061] It should be noted that the signal processing module consists of a preamplifier circuit, a bandpass filter circuit, and an analog-to-digital converter (ADC). The preamplifier circuit uses a KTA333-ST5 transistor, which features low noise and high amplification, effectively amplifying the weak signal received by the ultrasonic transducer and preventing the signal from being masked by noise due to low amplitude during subsequent processing. The bandpass filter circuit consists of capacitors and resistors, with capacitor parameters ranging from 100nF to 470nF and resistor parameters ranging from 10Ω to 49.9kΩ. By properly matching the parameters of the capacitors and resistors, the filter circuit allows only the frequency components corresponding to the ultrasonic signal to pass through, filtering out low-frequency interference in the environment and high-frequency noise from the circuit itself. The ADC is integrated into the microcontroller chip of the main control module, which can directly convert the amplified and filtered analog signal into a digital signal, reducing signal loss and interference during transmission between modules and ensuring the integrity of the ultrasonic propagation time data. A signal processing module built with specific components can specifically optimize ultrasonic signal quality: the preamplifier circuit solves the problem of weak signals being difficult to process, the bandpass filter circuit effectively suppresses noise interference, and the integrated analog-to-digital converter reduces signal transmission errors. The synergistic effect of these three components ensures that the output ultrasonic propagation time data has a high signal-to-noise ratio and high accuracy, avoiding flow velocity calculation deviations caused by signal quality issues. This provides a high-quality data foundation for subsequent accuracy verification, further guaranteeing the reliability of the verification results.

[0062] In some embodiments, the compensation module includes a temperature sensor and a pressure sensor. The temperature sensor is a PT100 platinum resistance sensor, and the pressure sensor is a diffused silicon pressure sensor. Both the temperature sensor and the pressure sensor are attached to the outer wall of the pipe through a waterproof encapsulation structure, and a thermally and electrically conductive gasket is provided between them and the outer wall of the pipe.

[0063] It should be noted that the compensation module includes a temperature sensor and a pressure sensor. The temperature sensor is a PT100 platinum resistance sensor, which features high measurement accuracy and good stability, and can accurately collect temperature changes of the fluid inside the pipeline. The pressure sensor is a diffused silicon pressure sensor, which has the advantages of fast response speed and strong anti-interference ability, and can capture subtle changes in fluid pressure in real time. Both the temperature and pressure sensors are attached to the outer wall of the pipeline through a waterproof encapsulation structure. The waterproof encapsulation structure can prevent damage to the sensors caused by the humid and salt spray environment of the submarine cable oil pump station, and extend the service life of the sensors. A thermally and electrically conductive gasket is set between the sensor and the outer wall of the pipeline. This gasket can enhance the heat conduction and signal transmission efficiency between the sensor and the pipeline, ensuring that the temperature and pressure parameters collected by the sensor can accurately reflect the actual state of the fluid inside the pipeline. The collected parameters are transmitted to the main control calculation module in real time to generate fluid state compensation coefficients.

[0064] Employing high-precision PT100 platinum resistance temperature sensors and diffused silicon pressure sensors, combined with waterproof encapsulation and thermally and electrically conductive pads, the design ensures the compensation module can operate stably in harsh underwater environments, preventing environmental factors from affecting sensor performance. Furthermore, it guarantees high accuracy of the acquired temperature and pressure parameters. The compensation coefficient generated based on these parameters can precisely correct the impact of temperature and pressure changes on ultrasonic wave propagation speed, effectively eliminating flow velocity calculation deviations caused by environmental fluctuations and further improving the device's calibration accuracy. Simultaneously, the sensor's adhesive installation does not damage the pipeline structure, conforming to the overall design concept of non-invasive calibration and ensuring the integrity of the pipeline system.

[0065] In some embodiments, the main control computing module uses a GD32F103C8T6 microcontroller as the core control unit, and the actual flow velocity of the fluid is calculated using the following formula:

[0066] ;

[0067] Where v is the actual flow velocity of the fluid, and L is the propagation path length of the ultrasonic wave within the pipe. The angle between the ultrasonic beam and the pipe axis. The time for ultrasound to travel downstream is denoted as . This represents the ultrasonic wave's back-current propagation time.

[0068] It should be noted that the main control computing module uses the GD32F103C8T6 microcontroller as the core control unit. This model of microcontroller features high processing speed, low power consumption, and high integration, and can simultaneously realize data reception, calculation, logic control, and communication functions. The calculation of the actual fluid velocity uses the ultrasonic propagation speed difference method, specifically implemented through the following formula: , where v is the actual flow velocity of the fluid, and L is the propagation path length of the ultrasonic wave in the pipe, which is pre-calculated and determined by the pipe diameter and the installation angle of the ultrasonic transducer. The angle between the ultrasonic beam and the pipe axis is the installation angle of the ultrasonic transducer. The time for ultrasound to travel downstream is denoted as . The ultrasonic wave propagation time is the time to return to its original direction. Both are acquired from the digital data output by the signal processing module. The main control calculation module calculates the initial actual flow velocity of the fluid using this formula, and then calibrates the initial flow velocity by combining the compensation coefficient generated by the compensation module to obtain the final actual flow velocity of the fluid.

[0069] Reference Figure 5 The selection of the GD32F103C8T6 microcontroller enables the main control computing module to have high-efficiency computing power and low power consumption, adapting to the needs of portable field verification. It can quickly complete flow velocity calculation and data comparison, shortening the verification time. The calculation formula based on the ultrasonic propagation velocity difference method is directly related to the key parameters of ultrasonic propagation, which can accurately convert to the actual flow velocity of the fluid, avoiding the calculation delay or error caused by complex algorithms and ensuring the accuracy of flow velocity calculation. At the same time, the parameters in the formula can be obtained through actual measurement or preset, without relying on complex field debugging, simplifying the operation process of the device, further improving verification efficiency, and providing a reliable flow velocity data foundation for accuracy comparison analysis.

[0070] In some embodiments, the accuracy calibration device for oil-filled submarine cable flowmeters further includes a power supply module, which includes an LMR14050 step-down chip, an AMS1117-3.3 voltage regulator chip, and a filter capacitor bank. The filter capacitor bank includes a 100nF ceramic capacitor and a 100uF electrolytic capacitor, which are used to convert the input 24V DC voltage into 5V and 3.3V stable voltages to power each module.

[0071] Reference Figure 6 and Figure 7It should be noted that the LMR14050 step-down chip features a wide input voltage range and high conversion efficiency, which can reduce the 24V DC input voltage to 5V DC voltage, providing power to components such as ultrasonic transducers and signal processing modules that require 5V power. The AMS1117-3.3 voltage regulator chip can further stabilize the 5V output voltage of the LMR14050 to 3.3V DC voltage, providing power to components such as the main control computing module and display module that require 3.3V power. The filter capacitor bank includes 100nF ceramic capacitors and 100uF electrolytic capacitors. The ceramic capacitors can filter out high-frequency power supply noise, and the electrolytic capacitors can filter out low-frequency power supply noise. Together, they form a wide-band filtering effect, ensuring the stability of the output voltage. By combining the LMR14050 step-down chip and the AMS1117-3.3 voltage regulator chip, the power module can stably output both 5V and 3.3V voltages to meet the different power supply requirements of various modules in the device. The filter capacitor bank effectively filters out high-frequency and low-frequency noise in the power supply, preventing power fluctuations from interfering with sensitive components such as the signal processing module and the main control computing module, ensuring that each module can work stably. At the same time, the high conversion efficiency of the power module reduces energy consumption, making it suitable for portable field use scenarios. Overall, it ensures the stable operation of the device in complex power supply environments, indirectly improving the reliability of the verification data and the continuity of the verification process.

[0072] In some embodiments, the non-invasive flow velocity detection module, signal processing module, compensation module, main control calculation module and display module are all encapsulated in a waterproof and corrosion-resistant shell made of 316L stainless steel. The oil-filled submarine cable flow meter accuracy calibration device is equipped with an adjustable portable mounting bracket, which is made of high-strength aluminum alloy and has rubber anti-slip pads.

[0073] It should be noted that the non-invasive flow velocity detection module, signal processing module, compensation module, main control computing module, and display module are all encapsulated in waterproof and corrosion-resistant shells. The shell material is 316L stainless steel, which has excellent corrosion resistance and water resistance, effectively resisting the harsh environment of the submarine cable oil pumping station, which is humid and salty, and preventing damage to the internal circuitry of the modules due to moisture or corrosion. The device is equipped with an adjustable portable mounting bracket made of high-strength aluminum alloy, ensuring sufficient structural strength to fix the device while reducing the weight of the bracket for easy on-site carrying and installation. The bracket surface is equipped with rubber anti-slip pads, which increase the friction between the bracket and the pipeline, preventing the bracket from sliding during the calibration process, and avoiding pipeline damage caused by direct contact between the bracket and the outer wall of the pipeline. The adjustable structure of the bracket can be adjusted to fix the size according to different pipeline diameters to adapt to different specifications of submarine cable pipelines. The use of a 16L stainless steel waterproof and corrosion-resistant shell significantly improves the device's adaptability to harsh environments, extends its service life, and reduces maintenance costs. The adjustable portable mounting bracket design allows the device to be quickly fixed to pipes of different diameters, eliminating the need for separate brackets for different pipe specifications. This enables multi-position flowmeter calibration, enhancing the device's flexibility and field practicality. The rubber anti-slip pads ensure the stability of the bracket fixation and protect the outer wall of the pipe, preventing additional damage to the pipeline system during the calibration process and further ensuring the integrity of the submarine cable system.

[0074] Reference Figure 1 Secondly, this embodiment provides a method for calibrating the accuracy of an oil-filled submarine cable flowmeter, comprising the following steps:

[0075] It transmits ultrasonic waves into the duct of the submarine cable and receives the ultrasonic signals after they have propagated through the fluid.

[0076] The ultrasonic signal is filtered, amplified, and digitized to output ultrasonic propagation time data;

[0077] Real-time acquisition of temperature and pressure parameters of fluid in the pipeline to generate fluid state compensation coefficient;

[0078] The actual fluid velocity is calculated based on the ultrasonic propagation time data, and the actual fluid velocity is calibrated by combining the fluid state compensation coefficient. The calibrated actual fluid velocity is then compared and analyzed with the measured value of the flow meter to be calibrated to obtain the accuracy verification result.

[0079] The accuracy verification results are then visualized and output.

[0080] The specific implementation process is as follows:

[0081] Step S1 involves installation and commissioning. The ultrasonic transducer of the non-invasive flow velocity detection module is fixed to the outside of a straight pipe section adjacent to the flow meter to be calibrated using a portable mounting bracket. The installation angle is adjusted so that the ultrasonic beam passes through the center of the pipe to ensure measurement accuracy. Step S2 involves parameter acquisition and initialization. The compensation module is activated to collect the temperature and pressure values ​​of the fluid in the pipe in real time and transmit them to the main control calculation module to generate the fluid state compensation coefficient. Step S3 involves ultrasonic signal acquisition. The non-invasive flow velocity detection module alternately emits ultrasonic signals in the downstream and upstream directions and simultaneously collects the downstream propagation time of the ultrasonic waves. and the time of reverse propagation Step S4 is signal processing. The signal processing module performs pre-amplification, bandpass filtering, and digitization on the received ultrasonic signal, and outputs the ultrasonic propagation time data to the main control calculation module. Step S5 is flow velocity calculation and calibration. The main control calculation module calculates the initial actual flow velocity of the fluid based on the ultrasonic propagation time data, and calibrates the final actual flow velocity by combining the fluid state compensation coefficient. Step S6 is accuracy comparison. The main control calculation module calls the measured value of the flow meter to be calibrated, calculates the relative error and accuracy level of the two, and generates the calibration result. Step S7 is result output. The display module outputs the actual flow value, the flow meter display value, the relative error, and the accuracy level, completing the calibration process. This verification method relies on a non-invasive device design, requiring no disassembly of the flowmeter or interruption of system operation throughout the entire process from installation to result output. This fundamentally solves the problems of high safety risks, system interruption, and reliance on spare parts inherent in traditional verification methods. The introduction of fluid state compensation coefficients and optimized signal processing ensure the accuracy of actual flow velocity calculations, while the quantitative calculation of relative error and accuracy level makes the verification results traceable. The entire verification process is automated, requiring no complex operations by professional personnel. The verification time for a single flowmeter is short, significantly improving verification efficiency. At the same time, the visualized result output facilitates maintenance personnel to quickly obtain verification information, providing efficient and reliable data support for submarine cable operation and maintenance decisions and ensuring the stable operation of high-voltage transmission systems.

[0082] In some embodiments, the operating frequency of the ultrasonic transducer is adaptively adjusted within the range of 0.5-2MHz according to the pipe material and fluid properties, and the accuracy of each set of propagation time data is optimized by averaging multiple acquisitions.

[0083] It should be noted that the operating frequency of the ultrasonic transducer is adaptively adjusted according to the pipe material and fluid properties, specifically within the range of 0.5MHz to 2MHz. When the pipe material is metal, a higher frequency can be selected to reduce signal attenuation; when the pipe material is composite material or the fluid viscosity is high, a lower frequency can be selected to ensure effective signal propagation. Simultaneously, each set of ultrasonic propagation time data is optimized by averaging multiple acquisitions. The specific number of acquisitions can be adjusted according to the ambient noise level, typically 5 to 10 times. After acquisition, outliers are removed, and the arithmetic mean of the remaining data is calculated as the final downstream ultrasonic propagation time. and the time of reverse propagation The adaptive adjustment of the ultrasonic operating frequency allows the device to optimize ultrasonic propagation based on the actual pipe material and fluid properties on site, avoiding excessive signal attenuation or reflection interference caused by a single frequency, and ensuring stable transmission and reception of ultrasonic signals. The method of multiple data acquisitions and averaging effectively reduces random measurement errors and minimizes the impact of environmental noise or instantaneous flow field fluctuations on propagation time measurements, improving the stability and accuracy of ultrasonic propagation time data. The synergistic effect of these two methods further optimizes the quality of the raw data for flow velocity calculation, reducing verification deviations caused by differences in operating conditions or random interference, improving the consistency and reliability of verification results, and enabling the device to maintain high verification accuracy under various on-site conditions.

[0084] In some embodiments, the compensation coefficient is generated by a temperature-pressure-velocity of sound mapping model, which is preset based on the physical properties of the insulating oil in the pipeline and supports updating the model parameters through an AT24C02 memory chip.

[0085] It should be noted that the compensation coefficient is generated through a temperature-pressure-velocity of sound mapping model. This mapping model is based on the physical properties of the insulating oil in the pipeline. The model pre-stores the variation law of ultrasonic wave propagation velocity in the insulating oil under different temperature and pressure conditions. The main control calculation module inputs the temperature and pressure values ​​collected by the compensation module into the model, and then outputs the corresponding compensation coefficient. At the same time, the mapping model supports updating parameters through the AT24C02 storage chip. When the batch of insulating oil in the pipeline is replaced or the on-site operating conditions change significantly, the new temperature-pressure-velocity of sound correspondence can be written into the AT24C02 storage chip through an external device to update the mapping model parameters and ensure that the calculation of the compensation coefficient always matches the actual fluid characteristics. Based on a pre-defined temperature-pressure-sound velocity mapping model of the insulating oil's physical properties, the device can accurately correlate environmental parameters with changes in ultrasonic wave propagation speed, ensuring the scientific validity and accuracy of the generated compensation coefficients. This effectively corrects the impact of temperature and pressure changes on the calculation of actual fluid flow velocity. The model parameter update mechanism supported by the AT24C02 memory chip allows the device to adapt to differences in the physical properties of different batches of insulating oil or long-term changes in field conditions, avoiding the decrease in compensation accuracy caused by long-term use of a fixed model. This ensures that the device maintains high calibration accuracy throughout long-term use. This design enhances the long-term applicability and flexibility of the device, allowing it to adapt to different fluid conditions without hardware replacement, further reducing the device's operating costs and maintenance difficulty.

[0086] Reference Figure 3 Thirdly, this embodiment provides a computer device, including a memory and a processor. The memory stores a computer program, and the processor is configured to execute the computer program to implement the above-described method for verifying the accuracy of an oil-filled submarine cable flowmeter.

[0087] In some embodiments, the accuracy verification method for oil-filled submarine cable flowmeters in the above embodiments can be implemented by a computer device, which includes at least one processor, a communication bus, a memory, and at least one communication interface.

[0088] A processor can be a general-purpose central processing unit (CPU) or an application-specific integrated circuit (ASIC).

[0089] A communication bus can be used to transmit information between the aforementioned components.

[0090] The memory can be read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, universal optical discs, Blu-ray discs, etc.), magnetic disks or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited to these. The memory can exist independently and be connected to the processor via a communication bus. The memory can also be integrated with the processor.

[0091] The memory stores program code for executing the solution of this application, and its execution is controlled by a processor. The processor executes the program code stored in the memory. The program code may include one or more software modules. In the above embodiments, the accuracy verification method for oil-filled submarine cable flowmeters can be implemented by a processor and one or more software modules in the program code in the memory.

[0092] A communication interface is a device that uses any transceiver or similar device to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.

[0093] In a specific implementation, as one example, a computer device may include multiple processors, each of which may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. Here, a processor may refer to one or more devices, circuits, and / or processing cores used to process data (e.g., computer program instructions).

[0094] The aforementioned computer device can be a general-purpose computer device or a special-purpose computer device. In specific implementations, the computer device can be a desktop computer, a portable computer, a network server, a handheld digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, or an embedded device. This application does not limit the type of computer device.

[0095] Fourthly, this embodiment provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described method for verifying the accuracy of an oil-filled submarine cable flowmeter.

[0096] To provide a clearer understanding of the invention, the invention is further described below:

[0097] An accuracy calibration device for an oil-filled submarine cable flowmeter includes a non-invasive flow velocity detection module, a signal processing module, a compensation module, a main control calculation module, a display module, and a power supply module. These modules work together to achieve online accuracy calibration of the flowmeter.

[0098] Non-invasive flow velocity detection module: The core component is at least one pair of ultrasonic transducers, which are symmetrically installed and fixed to the outside of the straight pipe section adjacent to the flow meter to be calibrated, with the installation angle controlled at [insert angle here]. This ensures that the ultrasonic beam can penetrate the central area of ​​the pipe, enabling non-contact measurement of fluid velocity. The ultrasonic transducer is waterproof and corrosion-resistant, and its operating frequency can be adjusted within the range of 0.5-2MHz according to the pipe material and fluid properties to meet measurement needs under different operating conditions.

[0099] Signal processing module: Communicates with the ultrasonic transducer and consists of a preamplifier circuit, a bandpass filter circuit, and an analog-to-digital converter unit. The preamplifier circuit uses a KTA333-ST5 transistor to amplify the weak ultrasonic received signal; the bandpass filter circuit consists of capacitors (C100nF, 220nF, 470nF) and resistors (…). , , Composed of components, it filters out environmental noise and circuit interference; the analog-to-digital conversion unit is integrated into the main control chip to convert analog signals into digital signals, ensuring accurate acquisition of propagation time data.

[0100] The compensation module includes a temperature sensor and a pressure sensor. The temperature sensor is a PT100 platinum resistance thermometer, and the pressure sensor is a diffused silicon pressure sensor. Both are attached to the outer wall of the pipe using a waterproof encapsulation structure, with a thermally and electrically conductive gasket placed between them and the pipe wall to ensure the accuracy of parameter acquisition. The compensation module collects the temperature and pressure values ​​of the fluid in real time and transmits them to the main control calculation module to generate a fluid state compensation coefficient, correcting the impact of temperature and pressure changes on the ultrasonic wave propagation speed.

[0101] The main control computing module uses a GD32F103C8T6 microcontroller as its core control unit, integrating data processing, logic control, and communication functions. The microcontroller receives ultrasonic propagation time data output from the signal processing module and calculates the initial actual flow velocity of the fluid using the ultrasonic propagation velocity difference method. The calculation formula is as follows: Where L is the length of the ultrasonic wave propagation path. The angle between the ultrasonic beam and the pipe axis. For downstream transmission time, This is the backflow propagation time. Simultaneously, the main control module, in conjunction with the compensation coefficient generated by the compensation module, calibrates the actual flow rate, then compares it with the measured value of the flow meter under test, calculates the relative error and accuracy level, and obtains the calibration result. Furthermore, the main control module is connected to the AT24C02 memory chip via the I2C bus, supporting the storage and updating of calibration parameters.

[0102] Display module: It adopts an LCD touch screen or a local LCD display unit, communicates with the main control computing module through a UART interface, and outputs verification results such as actual flow rate, flow meter display value, relative error, and accuracy level in real time. It supports local data storage and remote transmission, making it convenient for maintenance personnel to view and record.

[0103] The power supply module includes an LMR14050 step-down chip, an AMS1117-3.3 voltage regulator chip, and a filter capacitor bank. The filter capacitor bank consists of a 100nF ceramic capacitor and a 100uF electrolytic capacitor, used to filter out power supply noise. The power supply module converts the input 24V DC voltage into 5V and 3.3V stable voltages, respectively supplying power to the ultrasonic transducer, signal processing module, and main control computing module, ensuring stable operation of the device.

[0104] In addition, each module of the device is encapsulated in a waterproof and corrosion-resistant shell made of 316L stainless steel, which is suitable for the humid and salt spray working environment of submarine cable oil pumping stations; it is equipped with an adjustable portable mounting bracket, which is made of high-strength aluminum alloy and has rubber anti-slip pads, and can be quickly fixed on pipes of different diameters to achieve multi-position inspection.

[0105] II. Accuracy Verification Method for Oil-filled Submarine Cable Flowmeters

[0106] The method for calibrating the accuracy of an oil-filled submarine cable flowmeter using the above-mentioned calibration device includes the following steps:

[0107] S1: During the installation and commissioning phase, the ultrasonic transducer of the non-invasive flow velocity detection module is fixed to the outside of the straight pipe section adjacent to the flow meter to be calibrated using a portable mounting bracket. Ensure that the distance between the installation position and the flow meter to be calibrated is not less than 3 times the pipe diameter to avoid flow field interference. Adjust the installation angle so that the ultrasonic beam passes through the center of the pipe. Tighten the bracket to ensure that the transducer fits tightly against the outer wall of the pipe without any loosening.

[0108] S2: Parameter acquisition initialization starts the compensation module. After the temperature and pressure sensors preheat, they begin to collect the temperature and pressure values ​​of the fluid in the pipeline in real time. Data is collected every 50ms, and 10 sets of data are collected continuously. The average value is taken and transmitted to the main control calculation module. The main control module generates the compensation coefficient k according to the preset temperature-pressure-velocity of sound mapping model. The mapping model is based on the preset physical properties of insulating oil and supports parameter updates through the AT24C02 storage chip.

[0109] S3: The main control module for ultrasonic signal transmission and reception sends control commands to the non-invasive flow velocity detection module. The ultrasonic transducer alternately transmits ultrasonic signals in the downstream and upstream directions, and the transmission frequency is adaptively adjusted within the range of 0.5-2MHz according to the pipe material and fluid properties; the downstream propagation time of the ultrasonic waves is simultaneously acquired. and the time of reverse propagation The accuracy of each set of propagation time data is optimized by averaging 10 data collections to reduce random errors.

[0110] S4: Signal Processing and Data Transmission. After receiving the ultrasonic reflected signal, the signal processing module performs pre-amplification, bandpass filtering, and digitization in sequence: the pre-amplification circuit amplifies the signal amplitude to 0.5-5V, the bandpass filter circuit filters out noise signals below 20kHz and above 5MHz, the analog-to-digital conversion unit converts the analog signal into a digital signal at a sampling rate of 1MHz, and the processed propagation time data is transmitted to the main control computing module through the SPI interface.

[0111] S5: Flow rate calculation and calibration main control calculation module calculates based on the received propagation time data. and Substitute into the flow velocity calculation formula To obtain the initial actual flow velocity of the fluid. The initial flow velocity is calibrated using a compensation coefficient k, and the calibration formula is as follows: The final actual flow velocity v is obtained, where the compensation coefficient k is dynamically adjusted according to the temperature and pressure values ​​to correct the influence of fluid density changes on the flow velocity measurement.

[0112] S6: Accuracy Comparison Analysis The main control calculation module reads the measured values ​​of the flow meter to be calibrated via the RS485 interface. Calculate the relative error between the two. And determine the accuracy class of the flow meter based on the relative error: when When, it is level 1 accuracy; when At %, the accuracy is 2.5; when If this occurs, the flow meter is deemed unqualified and requires maintenance or replacement.

[0113] S7: The verification result output and display module outputs the actual flow rate value v and the flow meter display value in real time. Relative error It measures the accuracy level and stores the verification data in a local storage unit, supporting remote transmission to the operation and maintenance management platform via wireless communication modules (such as 4G and WiFi) to complete a verification process.

[0114] The technical solution of the present invention will be described in detail below with reference to specific embodiments:

[0115] Example 1:

[0116] In this embodiment, the non-invasive flow velocity detection module uses two pairs of ultrasonic transducers, model UB300-18GM75-E5-V1, with an operating frequency of 1MHz, an installation angle of 50°, and an ultrasonic propagation path length L=0.5m; the preamplifier circuit of the signal processing module uses a KTA333-ST5 transistor, and the bandpass filter circuit consists of C1=100nF, C2=220nF, R1=10Ω, and R2=4.99kΩ; the temperature sensor of the compensation module is... The system uses a PT100 platinum resistance thermometer (measurement range -20℃~120℃, accuracy ±0.1℃) and an MPX5700DP pressure sensor (measurement range 0~700kPa, accuracy ±0.25%FS). The main control computing module uses a GD32F103C8T6 microcontroller with a clock frequency of 72MHz. The display module is a 12864 LCD touch screen. The power supply module has an input of 24VDC and outputs 5VDC (maximum current 2A) and 3.3VDC (maximum current 1A).

[0117] Example 2: Verification Process and Results

[0118] Taking a certain type of electromagnetic flowmeter of a 500kV oil-filled submarine cable in a certain region's network system as the calibration object, the pipe diameter is 100mm, the insulating oil temperature is 45℃, and the pressure is 0.3MPa. The specific calibration process is as follows:

[0119] Install the ultrasonic transducer on the outside of a straight pipe section 1m upstream of the flow meter, and adjust the installation angle. Fixed adjustable portable mounting bracket;

[0120] Start the device; the compensation module collects temperature data. Pressure 0.298 MPa, generating compensation coefficient k = 0.008;

[0121] The ultrasonic transducer emits a 1MHz ultrasonic signal and collects the downstream propagation time. =125.3μs, backflow propagation time =127.8μs;

[0122] The main control module calculates the initial flow rate. ≈1.2 m / s, actual flow velocity after calibration ;

[0123] Read the measured value of the flow meter to be calibrated Calculate the relative error = The accuracy level is determined to be Level 1.

[0124] The display module outputs the above data to complete the verification. The entire process takes about 3 minutes and does not require interruption of the oil pump station operation.

[0125] Terminology Explanation

[0126] 1. Ultrasonic Propagation Velocity Difference Method: This method measures fluid velocity by utilizing the difference in propagation speed of ultrasonic waves in the upstream and downstream directions.

[0127] 2. Ultrasonic Transducer: A device that converts electrical energy into acoustic energy, including a transmitter and a receiver;

[0128] 3. Non-invasive Measurement: Measurement is performed without contact with the measured medium or damage to the pipeline structure;

[0129] 4. Time of Flight Difference (TFD) or propagation time data: The time difference between the propagation of ultrasound waves in the downstream and upstream directions;

[0130] 5. Accuracy Class: The maximum permissible range of error between the flow meter's measurement result and the true value.

[0131] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An accuracy calibration device for an oil-filled submarine cable flowmeter, characterized in that, include: A non-invasive flow velocity detection module is used to transmit ultrasonic waves into the duct of a submarine cable and receive the ultrasonic signals after they have been propagated through the fluid. The signal processing module is communicatively connected to the non-invasive flow velocity detection module and is used to filter, amplify, and digitize the ultrasonic signal to output ultrasonic propagation time data. The compensation module is used to collect the temperature and pressure parameters of the fluid in the pipeline in real time and generate fluid state compensation coefficients. The main control calculation module is electrically connected to the signal processing module and the compensation module respectively. It is used to calculate the actual flow velocity of the fluid based on the ultrasonic propagation time data. The main control calculation module calibrates the actual flow velocity of the fluid in combination with the fluid state compensation coefficient, and compares and analyzes the calibrated actual flow velocity with the measured value of the flow meter to be calibrated to obtain the accuracy verification result. The display module is communicatively connected to the main control computing module and is used to visually output the accuracy verification results.

2. The accuracy calibration device for oil-filled submarine cable flowmeters according to claim 1, characterized in that: The non-invasive flow velocity detection module includes at least one pair of ultrasonic transducers. Each pair of ultrasonic transducers is symmetrically installed on the outside of a straight pipe section adjacent to the flow meter to be calibrated. The installation angle of each ultrasonic transducer with respect to the pipe axis is [insert angle here]. Furthermore, the axis of the ultrasonic beam intersects the axis of the pipe in the central region of the pipe.

3. The accuracy calibration device for oil-filled submarine cable flowmeters according to claim 1, characterized in that: The signal processing module includes a preamplifier circuit, a bandpass filter circuit, and an analog-to-digital converter unit. The preamplifier circuit is constructed using a KTA333-ST5 transistor, and the bandpass filter circuit includes a capacitor and a resistor. The analog-to-digital converter unit is integrated into the microcontroller chip of the main control computing module.

4. The accuracy calibration device for oil-filled submarine cable flowmeters according to claim 1, characterized in that: The compensation module includes a temperature sensor and a pressure sensor; both the temperature sensor and the pressure sensor are attached to the outer wall of the pipe through a waterproof encapsulation structure, and a thermally and electrically conductive gasket is provided between them and the outer wall of the pipe.

5. The accuracy calibration device for oil-filled submarine cable flowmeters according to claim 1, characterized in that: The main control computing module uses a GD32F103C8T6 microcontroller as the core control unit, and the actual flow velocity of the fluid is calculated using the following formula: ； Where v is the actual flow velocity of the fluid, and L is the propagation path length of the ultrasonic wave within the pipe. The angle between the ultrasonic beam and the pipe axis. The time for ultrasound to travel downstream is denoted as . This represents the ultrasonic wave's back-current propagation time.

6. The accuracy calibration device for oil-filled submarine cable flowmeters according to claim 1, characterized in that: It also includes a power supply module, which includes an LMR14050 step-down chip, an AMS1117-3.3 voltage regulator chip, and a filter capacitor bank. The filter capacitor bank includes ceramic capacitors and electrolytic capacitors, which are used to convert the input 24V DC voltage into 5V and 3.3V stable voltages.

7. The accuracy calibration device for oil-filled submarine cable flowmeters according to claim 1, characterized in that: The non-invasive flow velocity detection module, signal processing module, compensation module, main control calculation module, and display module are all encapsulated in a waterproof and corrosion-resistant shell; and the accuracy calibration device for the oil-filled submarine cable flowmeter is equipped with an adjustable portable mounting bracket, which is provided with a rubber anti-slip pad.

8. A method for calibrating the accuracy of an oil-filled submarine cable flowmeter, characterized in that, The verification apparatus according to any one of claims 1-7 comprises the following steps: It transmits ultrasonic waves into the duct of the submarine cable and receives the ultrasonic signals after they have propagated through the fluid. The ultrasonic signal is filtered, amplified, and digitized to output ultrasonic propagation time data; Real-time acquisition of temperature and pressure parameters of fluid in the pipeline to generate fluid state compensation coefficient; The actual fluid velocity is calculated based on the ultrasonic propagation time data, and the actual fluid velocity is calibrated by combining the fluid state compensation coefficient. The calibrated actual fluid velocity is then compared and analyzed with the measured value of the flow meter to be calibrated to obtain the accuracy verification result. The accuracy verification results are then visualized and output.

9. A computer device comprising a memory and a processor, the memory storing a computer program, the processor being configured to, when executing the computer program, implement the accuracy verification method for an oil-filled submarine cable flowmeter as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the accuracy verification method for an oil-filled submarine cable flowmeter as described in claim 8.

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