Portable large transformer bushing sealing performance detection device and method

Abstract

The invention discloses a portable large transformer bushing sealing performance detection device and method, a pressure gas storage bottle is connected with a pressure reducing valve, the pressure reducing valve is connected with a gas inlet pipe self-sealing quick connector, and the pressure reducing valve adjusts the pressure of gas output by the pressure gas storage bottle; the detection module comprises an air inlet pipe, a portable detector and a measuring pipe, the air inlet pipe self-sealing quick connector is connected with the air inlet pipe, the air inlet pipe is connected with the portable detector, and the portable detector is connected with the measuring pipe; the measuring module comprises a measuring pipe self-sealing quick connector, a measuring data remote transmission device, a middle connector and a multimode transformer sleeve connector, the measuring pipe is connected with the measuring pipe self-sealing quick connector, the measuring pipe self-sealing quick connector is connected with the measuring data remote transmission device, the measuring data remote transmission device is connected with the middle connector, and the multimode transformer sleeve connector is connected with the multimode transformer sleeve connector. The middle connector is connected with a multi-mode transformer sleeve connector, and the multi-mode transformer sleeve connector is connected with an upper oil taking valve or a lower oil taking valve of a transformer sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of transformer detection, and more particularly to a portable large-scale transformer bushing sealing detection device and method. Background Art

[0002] The transformer bushing is an important component outside the transformer box. It leads the internal leads of the transformer to the outside of the oil tank, and plays the role of insulation and fixation between the lead wires and between the lead wires and the transformer casing. Among the transformer failures in operation, the proportion of transformer failures caused by water ingress into the bushing due to poor bushing sealing is relatively high.

[0003] At present, the oil level of the bushing is usually determined by observing the oil level through the oil level window of the bushing for such faults. Large transformers with ultra-high voltage (500kV) and above voltage levels are large in size, and their bushings are high above the ground. The traditional observation method cannot obtain the bushing oil level in a timely and accurate manner. In addition, the bushings of large transformers are only tested for sealing when the equipment leaves the factory. There is no effective means of sealing testing during the transformer power outage maintenance stage or when the bushing spare parts are stored.

[0004] There are few relevant technical patents for transformer bushing sealing detection. The existing document CN202120180950 (Sealing detection device for low-voltage bushing of large power transformer) proposes a support frame for low-voltage bushing of large transformer, which is convenient for supporting and adjusting the low-voltage bushing to complete sealing detection; the document CN202110318957 (A method for monitoring the sealing degree of transformer bushing) provides a set of sealing monitoring devices, which judges the sealing degree by the changes in temperature and pressure inside the bushing; the document CN201610786835 (A device and method for detecting micro-leakage of the end seal of the large transformer bushing) detects leakage at the end of the transformer bushing.

[0005] The above technical patents are not applicable to the tightness monitoring of large transformer bushings, and the detection requires a large number of devices and equipment, which are not portable and easy to operate.

[0006] Therefore, how to provide a device and method for detecting the sealing performance of large transformer bushings that is portable, high in precision and easy to operate is an urgent problem that needs to be solved by those skilled in the art. Summary of the invention

[0007] In view of this, the present invention provides a portable large transformer bushing sealing detection device and method, aiming to solve the above technical problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A portable large transformer bushing sealing detection device, comprising:

[0010] A pressure gas supply module, the pressure gas supply module comprising a pressure gas storage bottle, a pressure reducing valve and an intake pipe self-sealing quick connector, wherein the pressure gas storage bottle is connected to the pressure reducing valve, the pressure reducing valve is connected to the intake pipe self-sealing quick connector, and the pressure reducing valve is used to adjust the gas pressure output by the pressure gas storage bottle;

[0011] A detection module, the detection module comprising an air intake pipe, a portable detector and a measuring tube, wherein the air intake pipe self-sealing quick connector is connected to the air intake pipe, the air intake pipe is connected to the portable detector, and the portable detector is connected to the measuring tube;

[0012] A measuring module, the measuring module comprises a measuring tube self-sealing quick connector, a measuring data remote transmission device, an intermediate connector and a multimode transformer bushing connector, wherein the measuring tube is connected to the measuring tube self-sealing quick connector, the measuring tube self-sealing quick connector is connected to the measuring data remote transmission device, the measuring data remote transmission device is connected to the intermediate connector, the intermediate connector is connected to the multimode transformer bushing connector, and the multimode transformer bushing connector is used to connect to the upper oil extraction valve or the lower oil extraction valve of the transformer bushing.

[0013] Furthermore, it also includes a portable detector, which includes an external temperature sensor, temperature detection, a single-chip computer system, a display module, an air circuit control module, a USB interface and an external U disk, wherein the air circuit control module is composed of an external air source port, a solenoid valve, a measuring port, an automatic pressure regulating module and an air vent.

[0014] Furthermore, the measurement data remote transmission device specifically includes:

[0015] One or more pressure sensors for measuring pressure changes inside the transformer bushing;

[0016] One or more temperature sensors for measuring temperature changes of the transformer bushing and its surroundings;

[0017] Signal conditioning circuits, used to convert sensor signals into a format suitable for transmission;

[0018] One or more wireless communication modules, including Bluetooth, Wi-Fi, ZigBee, cellular network or radio frequency modules, for wirelessly transmitting data to the portable detector;

[0019] Wired communication interface, including USB, Ethernet or serial port, for transmitting data via wires to the portable detector;

[0020] A power module is used to provide the required electrical energy for the measurement data remote transmission device, including a battery, a solar panel or a power source obtained from a portable detector;

[0021] A data processing unit, used for preprocessing sensor data, including filtering, amplification, and analog-to-digital conversion;

[0022] A storage unit for temporarily storing monitoring data for use in case of communication interruption or other needs;

[0023] An identification module is used to distinguish different measurement data remote transmission devices when multiple sets of equipment are used simultaneously;

[0024] The status indication module is used to provide the operator with the working status of the device, including power status, communication status, and data transmission status;

[0025] The safety protection module is used to ensure the safe operation of the measurement data remote transmission device under high voltage, high temperature or other dangerous conditions, including overvoltage protection, overcurrent protection, and short circuit protection.

[0026] Furthermore, the external temperature sensor and the temperature detection module of the portable detector detect and record the current ambient temperature and the surface temperature of the transformer bushing to ensure the accuracy and reliability of the sealing detection process;

[0027] Specifically include: one or more high-precision temperature sensors for measuring ambient temperature and the surface temperature of the transformer bushing; a mounting bracket for the temperature sensor, designed to fix the temperature sensor at a specific position on the transformer bushing to facilitate accurate temperature readings; a real-time temperature display unit, the display module of the portable detector can display the currently measured ambient temperature and the surface temperature of the transformer bushing in real time; a temperature data recording unit, the portable detector can record the temperature changes during the detection process and store the data in a built-in or external storage device for subsequent analysis.

[0028] Furthermore, the single chip microcomputer system is specifically:

[0029] Central processing unit, used to perform various calculation and control tasks during the sealing test process;

[0030] Random access memory, used to temporarily store data collected during the detection process and intermediate calculation results;

[0031] Read-only memory or flash memory, used to store firmware and program code for the microcontroller system;

[0032] A digital signal processor is used to process the analog signal collected by the sensor and convert it into a digital signal;

[0033] Analog-to-digital converter, used to convert analog signals from pressure sensor and temperature sensor into digital signals for CPU processing;

[0034] Digital communication interfaces, including serial communication interfaces, I2C, SPI or CAN bus, for exchanging data with external devices including sensors, displays and storage devices;

[0035] Human-machine interface control logic, used to manage and control the display module, display real-time data and system status, and receive user input;

[0036] Real-time clock, used to record the timestamp of detection events and provide system time to the display module;

[0037] Power management circuit, used to monitor and adjust the power supply of the MCU system to ensure the power efficiency and stability of the system under different working conditions;

[0038] Fault detection and diagnosis module, used to monitor system status in real time, detect potential hardware failures, and provide fault information to operators;

[0039] Safety protection logic is used to automatically cut off power or take other safety measures to protect the safety of equipment and operators when abnormal conditions are detected, including excessively high or low pressure.

[0040] Furthermore, the display module is specifically:

[0041] Backlight adjustment unit, automatically or manually adjusts the screen backlight intensity according to ambient light conditions to improve readability;

[0042] Multi-language support unit, which displays menus and information in different languages ​​according to user settings to meet the needs of different users;

[0043] Data display interface unit, including real-time pressure value, temperature value, pressure curve graph, historical data comparison, system status indication and alarm information;

[0044] Customize the display settings unit to select the displayed data and information as well as the data update frequency according to your needs.

[0045] Furthermore, the gas circuit control module specifically includes:

[0046] One or more solenoid valves are used to automatically open or close the gas flow according to the control signal of the single-chip microcomputer system to ensure the precise control of the gas pressure; the automatic pressure regulating module, including a proportional valve or a servo valve, is used to automatically adjust the gas pressure to adapt to different detection conditions and requirements; a high-precision pressure sensor is used to monitor the gas pressure in real time and convert it into an electrical signal and output it to the single-chip microcomputer system for processing; the vent port is equipped with a quick vent valve to quickly release the gas pressure in the casing after the detection is completed to ensure safe operation; the measuring port is connected to the measuring tube to transmit the gas pressure to the transformer casing for sealing detection; the external gas source port is used to connect the external gas supply system to provide a stable gas source for detection; the gas filter is used to filter the gas entering the system to prevent dust, moisture and other impurities from affecting the detection results; the gas pressure gauge is used to intuitively display the current gas pressure to facilitate the operator to perform manual adjustment and system calibration; the gas flow meter is used to measure the gas flow rate to ensure the stability and uniformity of the gas flow; the gas pressure adjustment knob is used to manually fine-tune the gas pressure to adapt to different detection requirements.

[0047] Furthermore, the USB interface is specifically:

[0048] Data transfer interface, supporting data transfer rates of USB 2.0 or higher; USB host interface, allowing the portable tester to connect to external USB devices, including USB flash drives, mobile hard drives, or other data storage devices; USB device interface, allowing the portable tester to connect to a computer or other host device for data download, upload, and software updates; electrical protection circuits for the USB interface, including overcurrent protection, overvoltage protection, and short-circuit protection to prevent electrical faults from damaging the portable tester;

[0049] A portable large transformer bushing sealing detection method, comprising:

[0050] Assemble and connect the pressure gas supply module, the detection module, and the measurement module;

[0051] Open the pressure gas storage cylinder and adjust the pressure reducing valve to ensure the gas pressure at the pressure reducing valve outlet;

[0052] Start the portable detector to perform airtightness self-test. After the portable detector shows that the airtightness self-test is normal, perform casing sealing test;

[0053] Select the corresponding multi-mode transformer bushing connector according to different transformer bushing manufacturers, different voltage levels and models, and connect the upper oil valve or lower oil valve of the transformer bushing;

[0054] Start the portable detector, open the pressure gas cylinder, adjust the pressure reducing valve to ensure the gas pressure at the pressure reducing valve outlet, operate the portable detector, and record the pressure value after the pressure indication stabilizes;

[0055] Close the pressure reducing valve and maintain the pressure for 15 minutes. After the pressure indication stabilizes, record the pressure value and calculate the stability coefficient.

[0056] After the test is completed, operate the portable tester to deflate the casing and remove the corresponding pipelines and modules;

[0057] Calculate the stability coefficient. If the stability coefficient meets the preset conditions, the casing sealing is good; if not, the casing sealing is poor.

[0058] Further, the stability coefficient k is calculated as |p a -p b | / p a ×100%, if the stability coefficient k≤0.5%, the casing sealing is good; if the stability coefficient k>0.5%, the casing sealing is poor.

[0059] The above technical solution includes at least the following technical effects:

[0060] Through the above technical solutions, it can be known that the present invention discloses a portable large transformer bushing sealing detection device and method. Compared with the prior art, the present invention can detect the sealing of large transformer bushings during power outage maintenance or bushing spare parts stored in the spare parts warehouse, and judge whether the sealing is good, so as to detect the bushing performance, avoid the bushing water ingress failure caused by poor bushing sealing, and avoid the expansion of bushing failure to transformer failure, which is an active defense measure. In addition, the detection device is small in size, easy to carry, simple in method and convenient to use, and can be applied to the sealing detection of transformer bushings including 220kV, 500kV and 1000kV. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0062] Figure 1 The present invention is a structural schematic diagram of a portable large transformer bushing sealing detection device.

[0063] Figure 2 The figure is a structural schematic diagram of the control principle of a portable detector of the present invention.

[0064] Figure 3 The present invention is a schematic diagram of the gas path principle structure of a portable detector.

[0065] Figure 4 The present invention is a flow chart of a portable large transformer bushing sealing detection method. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] See attached Figure 1-4 The embodiment of the present invention discloses a portable large transformer bushing sealing detection device, comprising:

[0068] Pressure gas supply module, universal serial bus port The pressure gas supply module includes a pressure gas storage bottle, a pressure reducing valve and an intake pipe self-sealing quick connector, wherein the pressure gas storage bottle is connected to the pressure reducing valve, the pressure reducing valve is connected to the intake pipe self-sealing quick connector, and the pressure reducing valve is used to adjust the gas pressure output by the pressure gas storage bottle;

[0069] The detection module, the universal serial bus port detection module comprises an air intake pipe, a portable detector and a measuring tube, wherein the air intake pipe self-sealing quick connector is connected to the air intake pipe, the air intake pipe is connected to the portable detector, and the portable detector is connected to the measuring tube;

[0070] The measuring module, the universal serial bus port measuring module comprises a measuring tube self-sealing quick connector, a measuring data remote transmission device, an intermediate connector and a multi-mode transformer bushing connector, wherein the measuring tube is connected to the measuring tube self-sealing quick connector, the measuring tube self-sealing quick connector is connected to the measuring data remote transmission device, the measuring data remote transmission device is connected to the intermediate connector, the intermediate connector is connected to the multi-mode transformer bushing connector, and the multi-mode transformer bushing connector is used to connect to the upper oil extraction valve or the lower oil extraction valve of the transformer bushing.

[0071] The measurement data remote transmission device specifically includes:

[0072] One or more pressure sensors for measuring pressure changes inside the transformer bushing;

[0073] One or more temperature sensors for measuring temperature changes of the transformer bushing and its surroundings;

[0074] Signal conditioning circuits, used to convert sensor signals into a format suitable for transmission;

[0075] One or more wireless communication modules, including Bluetooth, Wi-Fi, ZigBee, cellular network or radio frequency modules, for wirelessly transmitting data to the portable detector;

[0076] Wired communication interface, including USB, Ethernet or serial port, for transmitting data via wires to the portable detector;

[0077] A power module is used to provide the required electrical energy for the measurement data remote transmission device, including a battery, a solar panel or a power source obtained from a portable detector;

[0078] A data processing unit, used for preprocessing sensor data, including filtering, amplification, and analog-to-digital conversion;

[0079] A storage unit for temporarily storing monitoring data for use in case of communication interruption or other needs;

[0080] An identification module is used to distinguish different measurement data remote transmission devices when multiple sets of equipment are used simultaneously;

[0081] The status indication module is used to provide the operator with the working status of the device, including power status, communication status, and data transmission status;

[0082] The safety protection module is used to ensure the safe operation of the measurement data remote transmission device under high voltage, high temperature or other dangerous conditions, including overvoltage protection, overcurrent protection, and short circuit protection.

[0083] Portable detector, universal serial bus port The portable detector includes an external temperature sensor, temperature detection, a single-chip microcomputer system, a display module, a gas circuit control module, a USB interface and an external U disk, wherein the gas circuit control module is composed of an external gas source port, a solenoid valve, a measuring port, an automatic pressure regulating module and a venting port.

[0084] The external temperature sensor and temperature detection module of the portable detector detect and record the current ambient temperature and the surface temperature of the transformer bushing to ensure the accuracy and reliability of the sealing detection process;

[0085] Specifically include: one or more high-precision temperature sensors for measuring ambient temperature and the surface temperature of the transformer bushing; a mounting bracket for the temperature sensor, designed to fix the temperature sensor at a specific position on the transformer bushing to facilitate accurate temperature readings; a real-time temperature display unit, the display module of the portable detector can display the currently measured ambient temperature and the surface temperature of the transformer bushing in real time; a temperature data recording unit, the portable detector can record the temperature changes during the detection process and store the data in a built-in or external storage device for subsequent analysis.

[0086] The microcontroller system is specifically composed of: a central processing unit, which is used to perform various calculation and control tasks during the sealing test; a random access memory, which is used to temporarily store the data collected during the test and the intermediate calculation results; a read-only memory or flash memory, which is used to store the firmware and program code of the microcontroller system; a digital signal processor, which is used to process the analog signals collected by the sensor and convert them into digital signals; an analog-to-digital converter, which is used to convert the analog signals of the pressure sensor and the temperature sensor into digital signals for CPU processing; a digital communication interface, including a serial communication interface, I2C, SPI or CAN bus, which is used to communicate digitally with external devices including sensors, displays and storage devices. data exchange; human-machine interface control logic, used to manage and control the display module, display real-time data and system status, and receive user input; real-time clock, used to record the timestamp of detection events, and provide system time to the display module; power management circuit, used to monitor and adjust the power supply of the microcontroller system to ensure the power efficiency and stability of the system under different working conditions; fault detection and diagnosis module, used to monitor the system status in real time, detect potential hardware failures, and provide fault information to the operator; safety protection logic, used to automatically cut off the power supply or take other safety measures when abnormal conditions are detected, including excessively high or low pressure, to protect the safety of equipment and operators.

[0087] The display module is specifically: a backlight adjustment unit, which automatically or manually adjusts the screen backlight intensity according to the ambient light conditions to improve readability; a multi-language support unit, which displays menus and information in different languages ​​according to user settings to meet the needs of different users; a data display interface unit, including real-time pressure values, temperature values, pressure curves, historical data comparisons, system status indications and alarm information; a custom display setting unit, which selects display data and information, as well as the data update frequency, as needed.

[0088] The gas circuit control module specifically includes: one or more solenoid valves, which are used to automatically open or close the gas flow according to the control signal of the single-chip microcomputer system to ensure the precise control of the gas pressure; an automatic pressure regulating module, including a proportional valve or a servo valve, which is used to automatically adjust the gas pressure to adapt to different detection conditions and requirements; a high-precision pressure sensor, which is used to monitor the gas pressure in real time and convert it into an electrical signal and output it to the single-chip microcomputer system for processing; a vent port, which is equipped with a quick vent valve, which is used to quickly release the gas pressure in the casing after the detection is completed to ensure safe operation; a measuring port, which is connected to the measuring tube and is used to transmit the gas pressure to the transformer casing for sealing detection; an external gas source port, which is used to connect to the external gas supply system to provide a stable gas source for detection; a gas filter, which is used to filter the gas entering the system to prevent dust, moisture and other impurities from affecting the detection results; a gas pressure gauge, which is used to intuitively display the current gas pressure, so that the operator can perform manual adjustment and system calibration; a gas flow meter, which is used to measure the gas flow rate to ensure the stability and uniformity of the gas flow; and a gas pressure adjustment knob, which is used to manually fine-tune the gas pressure to adapt to different detection requirements.

[0089] The USB interface is specifically: a data transfer interface that supports the data transfer rate of USB 2.0 or higher; a USB host interface that allows the portable detector to be connected to an external USB device, including a USB flash drive, a mobile hard disk, or other data storage device; a USB device interface that allows the portable detector to be connected to a computer or other host device for data download, upload, and software update; an electrical protection circuit for the USB interface, including overcurrent protection, overvoltage protection, and short-circuit protection to prevent electrical faults from damaging the portable detector;

[0090] A portable large transformer bushing sealing detection method comprises: assembling and connecting a pressure gas supply module, a detection module and a measuring module; opening a pressure gas storage bottle, adjusting a pressure reducing valve to ensure the gas pressure at the outlet of the pressure reducing valve; starting a portable detector, performing an airtightness self-test, and performing bushing sealing detection after the portable detector displays that the airtightness self-test is normal; selecting corresponding multi-mode transformer bushing joints according to different transformer bushing manufacturers, different voltage levels and models, and connecting the upper oil extraction valve or the lower oil extraction valve of the transformer bushing; starting the portable detector, opening a pressure gas storage bottle, adjusting the pressure reducing valve to ensure the gas pressure at the outlet of the pressure reducing valve, operating the portable detector, and recording the pressure value after the pressure indication is stable; closing the pressure reducing valve, maintaining the pressure for 15 minutes, recording the pressure value after the pressure indication is stable, and calculating the stability coefficient; after the detection is completed, operating the portable detector to deflate the bushing, and removing the corresponding pipeline and module; calculating the stability coefficient, if the stability coefficient meets the preset conditions, the bushing sealing is good; if not, the bushing sealing is poor.

[0091] Calculate the stability coefficient k = |p a -pb | / p a ×100%, if the stability coefficient k≤0.5%, the casing sealing is good; if the stability coefficient k>0.5%, the casing sealing is poor.

[0092] Device composition

[0093] The device is mainly composed of three modules: pressure gas supply module, detection module and measurement module.

[0094] 1. Pressure gas supply module

[0095] Pressure gas cylinder: used to store high-pressure gas as a gas source.

[0096] Pressure reducing valve: connected after the pressure gas storage cylinder, used to adjust and stabilize the output gas pressure to ensure that the gas pressure is within a safe and effective range.

[0097] Inlet pipe self-sealing quick connector: connected to the pressure reducing valve, used to deliver the regulated pressure gas to the detection module.

[0098] 2. Detection module

[0099] Inlet pipe: connected to the self-sealing quick connector and portable detector, responsible for gas transmission.

[0100] Portable detector: core control unit, integrating data processing, display, control and other functions.

[0101] External temperature sensor: used to measure the temperature of the environment and the transformer bushing surface.

[0102] Single chip microcomputer system: controls the detection process and processes sensor signals.

[0103] Display module: displays real-time data and system status.

[0104] Gas path control module: controls gas flow direction and pressure.

[0105] USB port: used for data transmission and device upgrade.

[0106] External USB flash drive: used for data storage.

[0107] Measuring tube: connects the portable detector and the measuring module and is used to transmit the test gas.

[0108] 3. Measurement module

[0109] Measuring tube self-sealing quick connector: connects the measuring tube and the measurement data remote transmission device.

[0110] Measurement data remote transmission device: including pressure and temperature sensors, signal conditioning circuits, communication modules, etc., responsible for data collection and transmission.

[0111] Intermediate connector: connects the measurement data remote transmission device and the multi-mode transformer bushing connector.

[0112] Multimode transformer bushing connector: Provides adapter connection according to the specifications of different transformer bushings, used to connect with the oil extraction valve of the transformer bushing.

[0113] Device Features

[0114] Portability: The device is small in size and easy to carry and operate on site.

[0115] High Precision: Adopt high-precision sensors and advanced data processing algorithms to ensure the accuracy of the test results.

[0116] Easy to operate: Humanized design simplifies the operation process and makes it easy for users to master it quickly.

[0117] Multifunctional: Integrated temperature and pressure detection to fully evaluate the sealing performance of transformer bushings.

[0118] Wireless communication: Supports multiple wireless communication methods to facilitate remote data transmission and monitoring.

[0119] Safety protection: The device has overvoltage, overcurrent and short circuit protection functions to ensure safe operation.

[0120] Device operation process

[0121] Assemble the device: Assemble the pressure supply module, detection module and measurement module according to the instructions or Figure 1 Make the connections as shown.

[0122] Check air tightness: Start the portable detector and perform a self-check of air tightness to ensure there is no leakage.

[0123] Connect the transformer bushing: Select the appropriate multimode transformer bushing connector according to the bushing specifications and connect it to the oil extraction valve of the transformer bushing.

[0124] Check the sealing performance: open the pressure gas cylinder, adjust the pressure reducing valve, start the detector, record the pressure value, and perform a pressure maintenance test.

[0125] Data analysis: After the pressure maintenance is completed, record the pressure value, calculate the stability coefficient, and determine whether the sealing is good.

[0126] Data recording and reporting: Store the test data in an external USB flash drive or transfer it to a computer via a USB interface, and generate a test report.

[0127] Specifically, the specific implementation process of this application is:

[0128] Step 1: Prepare the test device

[0129] Check the equipment list: Make sure all components are complete, including the pressure gas supply module, detection module, measurement module, portable detector and its accessories.

[0130] Check the power supply: Make sure the portable detector's battery is fully charged or connected to a stable power source.

[0131] Check the connections: Make sure all quick connectors and connectors are intact and leak-tight.

[0132] Step 2: Assemble the detection device

[0133] Connect the pressure supply module:

[0134] Connect the output end of the pressure gas storage bottle to the input end of the pressure reducing valve.

[0135] Connect the output end of the pressure reducing valve to the self-sealing quick connector of the air inlet pipe to ensure there is no air leakage.

[0136] Connection detection module:

[0137] Connect the intake pipe self-sealing quick connector to the intake pipe.

[0138] Connect the air inlet pipe to the air input port of the portable detector.

[0139] Connect the gas outlet of the portable detector to the measuring tube.

[0140] Connect the measurement module:

[0141] Connect the measuring tube to the measuring tube self-sealing quick connector.

[0142] Connect the self-sealing quick connector of the measuring tube to the remote transmission device of the measuring data.

[0143] Connect the measurement data remote transmission device to the middle connector.

[0144] Connect the intermediate connector to the multimode transformer bushing connector.

[0145] Step 3: Connect the Transformer Bushing

[0146] Choose the right connector: Choose the right type of multimode transformer bushing connector according to the specifications of the transformer bushing.

[0147] Connecting bushings: Connect the multimode transformer bushing connector to the oil extraction valve of the transformer bushing, ensuring that the connection is secure and sealed.

[0148] Step 4: Start the detection process

[0149] Turn on the pressure source:

[0150] Open the valve of the pressure gas cylinder.

[0151] Adjust the pressure reducing valve to gradually increase the pressure until the predetermined detection pressure is reached.

[0152] Self-test:

[0153] Start the portable tester and perform a self-test procedure to ensure that all sensors and circuits are working properly. Record the initial pressure:

[0154] After the pressure stabilizes, record the initial pressure value.

[0155] Pressure holding test:

[0156] Close the pressure reducing valve, maintain the pressure unchanged, and conduct a 15-minute pressure test.

[0157] During the pressure maintenance period, check the pressure value regularly to ensure that there is no obvious drop.

[0158] Step 5: Data Analysis and Conclusion

[0159] Record the final pressure:

[0160] After the pressure maintenance is completed, record the pressure value again.

[0161] Calculate the rate of change of pressure, i.e. the stability factor.

[0162] Evaluation of sealing:

[0163] By comparing the stability coefficient with the preset standard, it is determined whether the casing sealing is qualified.

[0164] Step 6: Data Recording and Reporting

[0165] Recording data:

[0166] All test data are recorded in the portable tester's built-in memory.

[0167] Transfer data to a computer via USB for backup and analysis.

[0168] Writing the report:

[0169] Write a detailed test report based on the test data.

[0170] The report should include the test conditions, stability factors, sealing evaluation and recommended follow-up actions.

[0171] Step 7: Equipment maintenance and cleaning

[0172] Cleaning equipment:

[0173] Wipe all exterior surfaces with a clean cloth to remove dust and oil.

[0174] Check and clean the gas filter to ensure it is not blocked.

[0175] Check for wear:

[0176] Check all fittings and seals for wear or damage and replace if necessary.

[0177] Storage devices:

[0178] Store all devices and accessories away from direct sunlight and moisture.

[0179] The present invention can detect the sealing of large transformer bushings during power outage maintenance or bushing spare parts stored in spare parts warehouses, and judge whether the sealing is good, so as to detect the performance of bushings, avoid the failure of bushings entering the bushings due to poor bushing sealing, and avoid the expansion of bushing failures to transformer failures, which is an active defense measure. In addition, the detection device is small in size, easy to carry, simple in method and convenient to use, and can be applied to the sealing detection of transformer bushings including 220kV, 500kV and 1000kV.

[0180] A portable large transformer bushing sealing detection device and method designed according to the present invention can detect the sealing of large transformer bushings during power outage maintenance or bushing spare parts stored in the spare parts warehouse, and judge whether the sealing is good, so as to detect the bushing performance, avoid the bushing water ingress failure caused by poor bushing sealing, and avoid the expansion of bushing failure to transformer failure, which is an active defense measure. In addition, the detection device is small in size, easy to carry, simple in method and convenient to use, and can be applied to the sealing detection of transformer bushings including 220kV, 500kV and 1000kV.

[0181] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0182] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable large transformer bushing sealing detection device, characterized in that: include: A pressure gas supply module, the pressure gas supply module comprising a pressure gas storage bottle, a pressure reducing valve and an intake pipe self-sealing quick connector, wherein the pressure gas storage bottle is connected to the pressure reducing valve, the pressure reducing valve is connected to the intake pipe self-sealing quick connector, and the pressure reducing valve is used to adjust the gas pressure output by the pressure gas storage bottle; A detection module, the detection module comprising an air intake pipe, a portable detector and a measuring tube, wherein the air intake pipe self-sealing quick connector is connected to the air intake pipe, the air intake pipe is connected to the portable detector, and the portable detector is connected to the measuring tube; A measuring module, the measuring module comprises a measuring tube self-sealing quick connector, a measuring data remote transmission device, an intermediate connector and a multimode transformer bushing connector, wherein the measuring tube is connected to the measuring tube self-sealing quick connector, the measuring tube self-sealing quick connector is connected to the measuring data remote transmission device, the measuring data remote transmission device is connected to the intermediate connector, the intermediate connector is connected to the multimode transformer bushing connector, and the multimode transformer bushing connector is used to connect to the upper oil extraction valve or the lower oil extraction valve of the transformer bushing.

2. A portable large transformer bushing sealing detection device according to claim 1, characterized in that: It also includes a portable detector, which includes an external temperature sensor, temperature detection, a single-chip computer system, a display module, an air circuit control module, a USB interface and an external U disk, wherein the air circuit control module is composed of an external air source port, a solenoid valve, a measuring port, an automatic pressure regulating module and an air vent.

3. A portable large transformer bushing sealing detection device according to claim 1, characterized in that: The measurement data remote transmission device specifically includes: One or more pressure sensors for measuring pressure changes inside the transformer bushing; One or more temperature sensors for measuring temperature changes in the transformer bushing and its surroundings; Signal conditioning circuits, used to convert sensor signals into a format suitable for transmission; One or more wireless communication modules, including Bluetooth, Wi-Fi, ZigBee, cellular network or radio frequency modules, for wirelessly transmitting data to the portable detector; Wired communication interface, including USB, Ethernet or serial port, for transmitting data via wires to portable detectors; A power module is used to provide the required electrical energy for the measurement data remote transmission device, including a battery, a solar panel or a power source obtained from a portable detector; A data processing unit, used for preprocessing sensor data, including filtering, amplification, and analog-to-digital conversion; A storage unit for temporarily storing monitoring data for use in case of communication interruption or other needs; An identification module is used to distinguish different measurement data remote transmission devices when multiple sets of equipment are used simultaneously; The status indication module is used to provide the operator with the working status of the device, including power status, communication status, and data transmission status; The safety protection module is used to ensure the safe operation of the measurement data remote transmission device under high voltage, high temperature or other dangerous conditions, including overvoltage protection, overcurrent protection, and short circuit protection.

4. A portable large transformer bushing sealing detection device according to claim 2, characterized in that: The external temperature sensor and temperature detection module of the portable detector detect and record the current ambient temperature and the surface temperature of the transformer bushing to ensure the accuracy and reliability of the sealing detection process; Specifically include: one or more high-precision temperature sensors for measuring ambient temperature and surface temperature of transformer bushing; The mounting bracket of the temperature sensor is designed to fix the temperature sensor at a specific position of the transformer bushing to obtain accurate temperature readings; the real-time temperature display unit, the display module of the portable detector can display the current measured ambient temperature and transformer bushing surface temperature in real time; the temperature data recording unit, the portable detector can record the temperature changes during the detection process and store the data in the built-in or external storage device for subsequent analysis.

5. A portable large transformer bushing sealing detection device according to claim 2, characterized in that: The single chip microcomputer system specifically comprises: Central processing unit, used to perform various calculation and control tasks during the sealing test process; Random access memory, used to temporarily store data collected during the detection process and intermediate calculation results; Read-only memory or flash memory, used to store firmware and program code for the microcontroller system; A digital signal processor is used to process the analog signal collected by the sensor and convert it into a digital signal; Analog-to-digital converter, used to convert the analog signals of the pressure sensor and temperature sensor into digital signals for CPU processing; Digital communication interfaces, including serial communication interfaces, I2C, SPI or CAN bus, for exchanging data with external devices including sensors, displays and storage devices; Human-machine interface control logic, used to manage and control the display module, display real-time data and system status, and receive user input; Real-time clock, used to record the timestamp of detection events and provide system time to the display module; Power management circuit, used to monitor and adjust the power supply of the microcontroller system, and to ensure the power efficiency and stability of the system under different working conditions; Fault detection and diagnosis module, used to monitor system status in real time, detect potential hardware failures, and provide fault information to operators; Safety protection logic is used to automatically cut off power or take other safety measures to protect the safety of equipment and operators when abnormal conditions are detected, including excessively high or low pressure.

6. A portable large transformer bushing sealing detection device according to claim 2, characterized in that: The display module specifically includes: Backlight adjustment unit, automatically or manually adjusts the screen backlight intensity according to ambient light conditions to improve readability; Multi-language support unit, which displays menus and information in different languages ​​according to user settings to meet the needs of different users; Data display interface unit, including real-time pressure value, temperature value, pressure curve graph, historical data comparison, system status indication and alarm information; Customize the display settings unit to select the displayed data and information as well as the data update frequency according to your needs.

7. A portable large transformer bushing sealing detection device according to claim 2, characterized in that: The gas circuit control module specifically includes: One or more solenoid valves are used to automatically open or close the gas flow according to the control signal of the single-chip microcomputer system to ensure the precise control of the gas pressure; the automatic pressure regulating module, including a proportional valve or a servo valve, is used to automatically adjust the gas pressure to adapt to different detection conditions and requirements; a high-precision pressure sensor is used to monitor the gas pressure in real time and convert it into an electrical signal and output it to the single-chip microcomputer system for processing; the vent port is equipped with a quick vent valve to quickly release the gas pressure in the casing after the detection is completed to ensure safe operation; the measuring port is connected to the measuring tube to transmit the gas pressure to the transformer casing for sealing detection; the external gas source port is used to connect the external gas supply system to provide a stable gas source for detection; the gas filter is used to filter the gas entering the system to prevent dust, moisture and other impurities from affecting the detection results; the gas pressure gauge is used to intuitively display the current gas pressure to facilitate the operator to perform manual adjustment and system calibration; the gas flow meter is used to measure the gas flow rate to ensure the stability and uniformity of the gas flow; the gas pressure adjustment knob is used to manually fine-tune the gas pressure to adapt to different detection requirements.

8. A portable large transformer bushing sealing detection device according to claim 2, characterized in that: The USB interface is specifically: Data transfer interface, supporting USB 2.0 or higher data transfer rates; USB host interface, allowing the portable detector to connect to external USB devices, including USB flash drives, mobile hard drives or other data storage devices; USB device interface, allowing the portable detector to be connected to a computer or other host device for data download, upload and software update; The electrical protection circuit of the USB interface includes over-current protection, over-voltage protection and short-circuit protection to prevent electrical faults from damaging the portable detector.

9. A portable large transformer bushing sealing detection method, characterized in that: Applicable to any one of the portable large transformer bushing sealing detection devices described in claims 1-8, the method comprising: Assemble and connect the pressure gas supply module, the detection module, and the measurement module; Open the pressure gas storage cylinder and adjust the pressure reducing valve to ensure the gas pressure at the pressure reducing valve outlet; Start the portable detector to perform airtightness self-test. After the portable detector shows that the airtightness self-test is normal, perform casing sealing test; Select the corresponding multi-mode transformer bushing connector according to different transformer bushing manufacturers, different voltage levels and models, and connect the upper oil valve or lower oil valve of the transformer bushing; Start the portable detector, open the pressure gas cylinder, adjust the pressure reducing valve to ensure the gas pressure at the pressure reducing valve outlet, operate the portable detector, and record the pressure value after the pressure indication stabilizes; Close the pressure reducing valve and maintain the pressure for 15 minutes. After the pressure indication stabilizes, record the pressure value and calculate the stability coefficient. After the test is completed, operate the portable tester to deflate the casing and remove the corresponding pipelines and modules; Calculate the stability coefficient. If the stability coefficient meets the preset conditions, the casing sealing is good; if not, the casing sealing is poor.

10. A portable large transformer bushing sealing detection method according to claim 9, characterized in that: Calculate the stability coefficient k = |p a -p b | / p a ×100%, if the stability coefficient k≤0.5%, the casing sealing is good; if the stability coefficient k>0.5%, the casing sealing is poor.

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