Constant-pressure apparatus and method for static-pressure testing of transformer

Abstract

A constant-pressure apparatus and method for static-pressure testing of a transformer. The method comprises: on the basis of historical training data, obtaining a static pressure interval of a static pressure supplementing oil tank (100) corresponding to a current environment; during a process in which a suspended tank (200) is used to perform oil pressure compensation on the static pressure supplementing oil tank (100), if an acquired first pressure intensity value is higher than a static pressure upper limit value, closing an exhaust valve (104) of the static pressure supplementing oil tank (100); continuing the oil pressure compensation until a first oil level value reaches a preset oil level upper threshold, and closing an oil injection valve of the static pressure supplementing oil tank (100); placing the static pressure supplementing oil tank (100) in communication with a transformer, performing air pressure compensation inside the static pressure supplementing oil tank (100) to ensure that the first oil level value is maintained within a preset oil level threshold interval, and performing continuous automatic air pressure compensation on the static pressure supplementing oil tank (100); and recording in real time a first pressure intensity change interval during the air pressure compensation, and forming historical training data from the first pressure intensity change interval and current spatial environment information.

Description

Transformer static pressure constant pressure device and method Technical Field

[0001] The present invention relates to the technical field of transformer sealing experiments, and more particularly to a transformer static pressure constant pressure device and method. Background Art

[0002] The manufacturing standard GB / T6451-2015 requires oil-immersed power transformers to undergo static pressure sealing tests, applying pressures of 30kPa-50kPa over varying timeframes, depending on the voltage level, to ensure leakage. Currently, the industry typically uses a 1-8 cubic meter overhead hanging tank suspended at a height of approximately 10 meters, then conducts static pressure tests on the transformer through a pipeline. During the test, as the oil temperature inside the transformer decreases, the oil volume shrinks, and the oil column height decreases. Therefore, it is necessary to ensure that the pressure on the transformer remains constant. This is done by using an electric contact pressure gauge and a digital pressure controller installed on the compensation oil tank to monitor the pressure in real time. For example, Chinese patent publication number CN206574575U discloses a constant pressure device for automatic gas pressure compensation oil pressure for transformers. When the pressure displayed by the electric contact pressure gauge or digital pressure controller reaches the lower limit, the control system activates a zero-pressure start solenoid valve, automatically compensating the gas pressure in the compensation oil tank.

[0003] However, since each static pressure test cycle is long, if multiple transformers need to be tested at the same time, it will lead to tight production scheduling and reduced production efficiency; if the existing high-altitude hanging tank capacity is not changed, since the volume of the high-altitude hanging tank is fixed, the amount of oil in the high-altitude hanging tank cannot meet the pressure oil compensation required for the static pressure of multiple transformers at the same time. Operators are required to patrol each transformer undergoing static pressure 24 hours a day and replenish the oil in time to maintain the specified pressure. Operators need to work in shifts, which increases the company's labor costs; and the oil of oil-immersed power transformers has a high temperature and pressure. During the oil replenishment process, if the operation is improper or a malfunction occurs, it may cause oil leakage, splashing or other safety accidents.

[0004] In view of this, the present invention provides a transformer static voltage constant voltage device and method.

[0005] Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a transformer static voltage constant pressure device and method.

[0007] In a first aspect, the present invention provides a transformer static pressure constant pressure device, comprising a static pressure supplementary oil tank for oil pressure compensation and a gas compensation tank for air pressure compensation, wherein the static pressure supplementary oil tank is connected to a high-altitude hanging tank and a gas compensation tank through a pipeline valve, and the gas compensation tank is externally connected to a dry gas tank;

[0008] It also includes a constant pressure control box, which has a built-in data acquisition module, an oil pressure control module and an air pressure control module; each module is connected via a wired and / or wireless network;

[0009] The data acquisition module collects the spatial environment information of the current static pressure replenishment tank, and collects the first pressure value and the first oil level value in the static pressure replenishment tank in real time;

[0010] A historical data preprocessing module collects historical training data required for predicting static pressure changes in a static pressure replenishment tank for a sealed static pressure test; based on the historical training data, a static pressure range for the static pressure replenishment tank corresponding to the current environment is obtained, where the static pressure range is the range between a lower limit value and an upper limit value of the static pressure;

[0011] The oil pressure control module uses the high-altitude hanging tank to perform oil pressure compensation on the static pressure supplementary oil tank. During the oil pressure compensation process, the first pressure value collected in real time is compared with the static pressure range. If the first pressure value is higher than the static pressure upper limit, the exhaust valve of the static pressure supplementary oil tank is closed. The high-altitude hanging tank continues to perform oil pressure compensation on the static pressure supplementary oil tank until the first oil level value reaches the preset oil level upper threshold, and the oil filling valve of the static pressure supplementary oil tank is closed.

[0012] The air pressure control module connects the static pressure supplementary oil tank with the transformer to compensate the air pressure in the static pressure supplementary oil tank. If the first oil level value is lower than the preset oil level lower threshold, the air pressure in the static pressure supplementary oil tank is reduced. If the first oil level value is higher than the preset oil level upper threshold, the air pressure in the static pressure supplementary oil tank is increased to ensure that the first oil level value is maintained within the preset oil level threshold range, and the static pressure supplementary oil tank is continuously and automatically compensated for the air pressure; the first pressure change interval during the air pressure compensation process is recorded in real time, and the first pressure change interval and the current spatial environment information are formed into historical training data.

[0013] In a preferred technical solution, the historical training data includes first training data collected in a sealed static pressure experimental environment;

[0014] The sealed static pressure test environment is a data collection environment in which the tester continuously collects data on the first oil level in the static pressure replenishment tank and maintains it within a preset oil level threshold range by controlling the physical factors that affect the oil pressure compensation in the static pressure replenishment tank.

[0015] The first training data includes several sets of static pressure characteristic data and oil level threshold intervals;

[0016] The oil level threshold interval is an interval formed between the oil level lower threshold and the oil level upper threshold, that is, the minimum value in the oil level threshold interval is the oil level lower threshold, and the maximum value in the oil level threshold interval is the oil level upper threshold;

[0017] The static pressure characteristic data includes real-time compensation oil temperature, ambient temperature, oil pressure compensation rate, oil pressure compensation capacity and health of static pressure replenishment tank;

[0018] The static pressure interval is the first pressure change interval that ensures that the first oil level value of the static pressure replenishing oil tank maintains within the oil level threshold interval when the current static pressure replenishing oil tank is in the state corresponding to the static pressure characteristic data. The first pressure change interval is the interval formed by the first pressure minimum value and the first pressure maximum value. The first pressure minimum value is less than the first pressure maximum value, and the first pressure minimum value is marked as the static pressure lower limit value, and the first pressure maximum value is marked as the static pressure upper limit value.

[0019] In a preferred technical solution, the specific steps of obtaining the static pressure range of the static pressure replenishment tank corresponding to the current environment from historical training data are as follows:

[0020] Constructing a machine learning model, using each set of static pressure characteristic data in the first training data as input to the machine learning model, and outputting a real-time first pressure value predicted for each set of static pressure characteristic data by the machine learning model;

[0021] The real-time first oil level values ​​in the oil pressure compensation are numbered in time series, and the first pressure value is fitted based on the static pressure characteristic data and the change of the first oil level value to obtain the degree of influence on the first pressure value;

[0022] The real-time first oil level value corresponding to the set of static pressure characteristic data is used as the prediction target, and minimizing the sum of the prediction errors of all real-time first oil level values ​​is used as the training goal; the machine learning model is trained until the sum of the prediction accuracies reaches convergence and the training is stopped.

[0023] In a preferred technical solution, the oil pressure compensation method of the static pressure replenishment tank is:

[0024] Step S101: closing the valve between the gas compensation tank and the static pressure replenishment tank to stop the gas supply from the gas compensation tank;

[0025] Step S102: opening the exhaust valve of the static pressure replenishment oil tank to discharge the gas in the static pressure replenishment oil tank, and then opening the high-altitude hanging tank to replenish transformer oil into the static pressure replenishment oil tank using the high-altitude hanging tank;

[0026] Step S103: When the exhaust valve of the static pressure replenishing oil tank overflows, the exhaust valve is closed, and oil is continued to be added to the static pressure replenishing oil tank. When the oil level indicated by the magnetic flap level gauge reaches the upper oil level threshold, the oil filling is stopped, and the valve between the overhead hanging tank and the static pressure replenishing oil tank is closed;

[0027] Step S104: Connect the pipeline between the transformer and the static pressure supplementary oil tank.

[0028] In a preferred technical solution, the specific process of filling the static pressure replenishment tank with gas is as follows:

[0029] Step S201: When the oil level in the magnetic flap level gauge is maintained within the oil level threshold range, the power supply of the gas compensation tank is started to enable the gas compensation tank to provide gas to the static pressure supplementary oil tank;

[0030] Step S202: Based on the height of the static oil column in the static pressure replenishment oil tank, an oil level threshold interval corresponding to the current static pressure replenishment oil tank is obtained; based on the oil level threshold interval, a static pressure threshold interval corresponding to the current static pressure replenishment oil tank is predicted; and the digital pressure controller presets a lower static pressure limit value and an upper static pressure limit value of the static pressure replenishment oil tank according to the static pressure threshold interval;

[0031] Step S203: If the real-time pressure value in the static pressure supplementary oil tank is within the static pressure threshold range, the valve between the transformer and the static pressure supplementary oil tank is opened, and air pressure compensation is performed on the static pressure supplementary oil tank according to the real-time pressure value.

[0032] In a preferred technical solution, the oil level threshold interval is an interval formed between the lower oil level threshold and the upper oil level threshold, that is, the minimum value in the oil level threshold interval is the lower oil level threshold, and the maximum value in the oil level threshold interval is the upper oil level threshold.

[0033] In a preferred technical solution, the specific logic of compensating the air pressure of the static pressure replenishment tank according to the real-time pressure value is as follows:

[0034] Step S301: opening the gas valve between the dry gas tank and the gas compensation tank to replenish gas into the gas compensation tank, and using a second pressure gauge to monitor the actual pressure in the gas compensation tank in real time, so that the actual pressure in the gas compensation tank reaches a preset buffer pressure value;

[0035] Step S302: If the measured air pressure value in the gas compensation tank is greater than the preset buffer air pressure value, the pressure is released through the safety valve to make the measured air pressure value in the gas compensation tank reach the preset buffer air pressure value;

[0036] Step S303: replenishing gas into the static pressure supplementary oil tank through the gas compensation tank so that the pressure in the static pressure supplementary oil tank is maintained within the static pressure threshold range; wherein, during the transformer static pressure test, the zero pressure start solenoid valve is required to be in a normally closed state and the emergency shut-off valve is required to be in a normally open state during the pressure maintenance process;

[0037] Step S304: When the oil pressure inside the transformer decreases due to temperature, volume reduction, and pressure decay, the measured pressure value in the static pressure supplementary oil tank drops to the lower limit of the transformer static pressure, and the digital pressure controller starts to provide a control signal, and the zero-pressure start solenoid valve opens to replenish air to the static pressure supplementary oil tank;

[0038] Step S305: When the pressure in the static pressure supplementary oil tank reaches the upper limit of the transformer static pressure, the digital pressure controller starts to provide a control signal, and the zero-pressure start solenoid valve closes the pipeline valve between the static pressure supplementary oil tank and the gas compensation tank, cutting off the gas source;

[0039] Step S306: Continuously and automatically perform air pressure compensation according to the pressure value measured by the magnetic-assisted electric contact pressure gauge in the static pressure replenishment oil tank.

[0040] In a preferred technical solution, when the pressure value in the zero-pressure starting solenoid valve corresponding to the static pressure replenishing oil tank is greater than the safety pressure threshold, the gas pressure in the static pressure replenishing oil tank is released, and the air pressure control module provides a signal to drive the gas emergency shut-off valve to close, cut off the gas source, control the pressure rise, and at the same time control the rotating alarm light to sound an alarm.

[0041] In a preferred technical solution, when the oil level in the static pressure replenishment tank drops to the lower oil level threshold, the magnetic flap level gauge sends the corresponding oil level signal in real time, and the air pressure control module drives the rotating alarm light to alarm, the emergency shut-off valve to close, the air source to cut off, and oil to the static pressure replenishment tank.

[0042] In a second aspect, the present invention provides a transformer static voltage constant pressure method, which is based on the implementation of the above-mentioned transformer static voltage constant pressure device, comprising:

[0043] Collecting spatial environment information of the current static pressure replenishment oil tank, and collecting the first pressure value and the first oil level value in the static pressure replenishment oil tank in real time;

[0044] Pre-collecting historical training data required for predicting static pressure changes in a static pressure replenishment tank for a sealing static pressure test; obtaining a static pressure range for the static pressure replenishment tank corresponding to a current environment based on the historical training data, wherein the static pressure range is a range formed between a lower limit value and an upper limit value of the static pressure;

[0045] The high-altitude hanging tank is used to perform oil pressure compensation on the static pressure supplementary oil tank. During the oil pressure compensation process, the first pressure value collected in real time is compared with the static pressure range. If the first pressure value is higher than the static pressure upper limit, the exhaust valve of the static pressure supplementary oil tank is closed. The high-altitude hanging tank continues to perform oil pressure compensation on the static pressure supplementary oil tank until the first oil level value reaches the preset oil level upper threshold, and the oil filling valve of the static pressure supplementary oil tank is closed.

[0046] Connect the static pressure supplementary oil tank to the transformer and perform air pressure compensation in the static pressure supplementary oil tank. If the first oil level value is lower than the preset oil level lower threshold, the air pressure in the static pressure supplementary oil tank is reduced. If the first oil level value is higher than the preset oil level upper threshold, the air pressure in the static pressure supplementary oil tank is increased to ensure that the first oil level value is maintained within the preset oil level threshold range, and continuously and automatically compensate the static pressure supplementary oil tank for air pressure; record the first pressure change interval during the air pressure compensation process in real time, and form the first pressure change interval and the current spatial environment information into historical training data.

[0047] The technical effects and advantages of the transformer static pressure constant pressure device and method of the present invention are as follows:

[0048] It can realize automatic stable compensation for the static pressure replenishment tank, continuously monitor and adjust the air pressure of the static pressure replenishment tank, ensure that the oil level in the tank is maintained within the preset oil level threshold range, thereby maintaining the stability of the static pressure and accurately controlling the oil level in the static pressure replenishment tank. When the oil level is lower than the preset lower oil level threshold, the system will add oil to the tank through the high-altitude hanging tank until the oil level reaches the preset upper oil level threshold, thereby realizing automatic control of the oil level; ensuring the stability and reliability of equipment operation; at the same time, automated control can reduce manual intervention, improve work efficiency, reduce the possibility of human operation errors, increase the life of the equipment, and improve the safety of the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] FIG1 is a flow chart of a transformer static voltage constant voltage method according to the present invention;

[0050] FIG2 is a schematic diagram of the overall structure of a transformer static pressure constant pressure device according to the present invention;

[0051] FIG3 is a top view of the overall structure of a transformer static pressure constant pressure device of the present invention;

[0052] FIG4 is a schematic diagram of the system structure of the constant pressure control box of the present invention;

[0053] In the figure: 100, static pressure replenishment oil tank; 101, magnetic assisted electric contact pressure gauge; 102, magnetic flap liquid level gauge; 103, digital display pressure controller; 104, exhaust valve; 105, rotating alarm light; 106, zero-pressure starting solenoid valve; 107, emergency shut-off valve; 200, high-altitude hanging tank; 300, gas compensation tank; 301, second pressure gauge; 302, safety valve; 400, dry gas tank; 500, constant pressure control box; 501, data acquisition module; 502, historical data preprocessing module; 503, oil pressure control module; 504, air pressure control module. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0055] Example 1

[0056] Referring to Figures 2-4, this embodiment shows a transformer static pressure constant pressure device, which is mainly used for performing static pressure sealing tests on transformers. The device includes a static pressure supplementary oil tank 100 for oil pressure compensation and a gas compensation tank 300 for air pressure compensation. The static pressure supplementary oil tank 100 is connected to a high-altitude hanging tank 200 and a gas compensation tank 300 through a pipeline valve. The gas compensation tank 300 is externally connected to a dry gas tank 400.

[0057] It should be noted here that the transformer oil used here is mainly due to the static pressure sealing experiment. There is no need to consider the consumption of transformer oil in the transformer. It is only necessary to consider the sealing problem of the transformer in the current environment and whether there will be oil leakage, splashing or other safety accidents.

[0058] The static pressure replenishing oil tank 100 used in this embodiment replenishes the transformer oil through the high-altitude hanging tank 200; the transformer oil is replenished into the transformer through a pressure pump or gravity supply, and the high-altitude hanging tank 200 can reduce the load pressure of the pressure pump; similarly, when the pressure pump can withstand sufficient load, the high-altitude hanging tank 200 can be replaced with a conventional transformer oil storage tank, as long as it can be ensured that the static pressure replenishing oil tank 100 and the transformer are in a stable state, without leakage or other safety issues.

[0059] It also includes a constant pressure control box 500, which has a built-in data acquisition module 501, an oil pressure control module 503 and an air pressure control module 504; each module is connected via a wired and / or wireless network, as shown in FIG3.

[0060] The data acquisition module 501 collects the spatial environment information of the current static pressure replenishment tank 100, and collects the first pressure value and the first oil level value in the static pressure replenishment tank 100 in real time, and collects the second pressure value in the gas compensation tank 300;

[0061] The first pressure value is obtained by real-time monitoring of the magnetic-assisted electric contact pressure gauge 101 on the static pressure replenishment tank 100;

[0062] The first oil level value can be obtained by real-time monitoring of the magnetic flap level gauge 102 on the static pressure replenishment oil tank 100;

[0063] The second pressure value can be obtained by real-time monitoring of the second pressure gauge 301 on the gas compensation tank 300;

[0064] It should be noted here that the magnetically assisted electric contact pressure gauge 101 is a pressure gauge for measuring gas pressure. It detects gas pressure through magnetically assisted electric contact technology, can monitor the pressure value of gas in the static pressure replenishment tank, and transmit this information to the control system so that timely adjustments can be made.

[0065] The magnetic flap level gauge 102 is a device used to measure the liquid oil level. It is based on the magnetic principle and determines the oil level by measuring the change in the magnetic field corresponding to the liquid level. This magnetic flap level gauge is installed in the static pressure replenishment tank and can continuously monitor the oil level of the transformer oil.

[0066] The second pressure gauge 301 is similar to the magnetic-assisted electric contact pressure gauge 101 and is a device for measuring gas pressure, and is used to monitor the pressure of the gas in the gas compensation tank.

[0067] By monitoring the conditions inside the static pressure supplementary oil tank and gas compensation tank in real time and making adjustments based on actual conditions, for example, if the oil level or gas pressure inside the static pressure supplementary oil tank deviates from the preset range, the control system can automatically activate the oil or gas replenishment device to maintain the oil level and gas pressure inside the transformer. This ensures the normal operation of the transformer and protects its safety and performance.

[0068] The historical data preprocessing module 502 pre-collects historical training data required for predicting static pressure changes within the static pressure replenishment tank 100 for the static pressure test of the seal; based on the historical training data, obtains a static pressure range for the static pressure replenishment tank 100 corresponding to the current environment, where the static pressure range is the range between the lower and upper static pressure limits.

[0069] The historical training data includes first training data collected in a sealed static pressure experimental environment;

[0070] The sealed static pressure test environment is a data collection environment in which a tester controls physical factors that affect the oil pressure compensation in the static pressure replenishment oil tank 100 and continuously collects data to ensure that the first oil level value in the static pressure replenishment oil tank 100 is maintained within a preset oil level threshold range;

[0071] The first training data includes several sets of static pressure characteristic data and oil level threshold intervals;

[0072] The oil level threshold interval is an interval formed between the oil level lower threshold and the oil level upper threshold, that is, the minimum value in the oil level threshold interval is the oil level lower threshold, and the maximum value in the oil level threshold interval is the oil level upper threshold;

[0073] The static pressure characteristic data includes real-time compensation oil temperature, ambient temperature, oil pressure compensation rate, oil pressure compensation capacity and health of static pressure replenishment tank;

[0074] The static pressure interval is the first pressure change interval that ensures that the first oil level value of the static pressure replenishing oil tank 100 maintains within the oil level threshold interval when the current static pressure replenishing oil tank 100 is in the state corresponding to the static pressure characteristic data. The first pressure change interval is the interval formed by the first pressure minimum value and the first pressure maximum value. The first pressure minimum value is less than the first pressure maximum value, and the first pressure minimum value is marked as the static pressure lower limit value, and the first pressure maximum value is marked as the static pressure upper limit value.

[0075] The specific steps of obtaining the static pressure range of the static pressure replenishment tank 100 corresponding to the current environment from historical training data are as follows:

[0076] Constructing a machine learning model, using each set of static pressure characteristic data in the first training data as input to the machine learning model, and outputting a real-time first pressure value predicted for each set of static pressure characteristic data by the machine learning model;

[0077] The real-time first oil level values ​​in the oil pressure compensation are numbered in time series, and the first pressure value is fitted based on the static pressure characteristic data and the change of the first oil level value to obtain the degree of influence on the first pressure value;

[0078] The real-time first oil level value corresponding to the set of static pressure characteristic data is used as the prediction target, and minimizing the sum of the prediction errors of all real-time first oil level values ​​is used as the training goal; the machine learning model is trained until the sum of the prediction accuracies reaches convergence and the training is stopped.

[0079] It should be noted here that: in the existing technology, the selection of the static pressure range is basically based on the work experience of the technicians. In actual applications, once it is found that the preset static pressure range is not accurate enough, the technicians need to adjust it according to the actual situation to ensure that the oil in the system remains within the predetermined pressure and oil level range, thereby ensuring the normal operation of the system. However, if the current constant pressure system needs to be more intelligent, the static pressure range needs to be adaptively adjusted according to the actual application scenario to ensure the intelligence of the current liquid oil pressure and oil level automatic compensation system.

[0080] Therefore, when choosing a machine learning model, for example, to predict a continuous output value (real-time first pressure value), a regression model may be a good choice. Common regression models include linear regression, decision tree regression, and random forest regression. This requires collecting sufficient first training data, including static pressure characteristic data and corresponding real-time first oil level values, to ensure data quality and standardize or normalize the data for better model training.

[0081] The oil pressure control module 503 uses the high-altitude hanging tank 200 to perform oil pressure compensation on the static pressure replenishment tank 100. During the oil pressure compensation process, the first pressure value collected in real time is compared with the static pressure range. If the first pressure value is higher than the static pressure upper limit, the exhaust valve of the static pressure replenishment tank 100 is closed; the high-altitude hanging tank 200 refuels the static pressure replenishment tank 100 until the first oil level value reaches the preset oil level upper threshold, and then the oil filling valve of the static pressure replenishment tank 100 is closed;

[0082] The air pressure control module 504 connects the static pressure replenishing oil tank 100 with the transformer, and performs air pressure compensation on the static pressure replenishing oil tank 100. If the first oil level value is lower than the preset oil level lower threshold, the air pressure in the static pressure replenishing oil tank 100 is reduced. If the first oil level value is higher than the preset oil level upper threshold, the air pressure in the static pressure replenishing oil tank 100 is increased to ensure that the first oil level value is maintained within the preset oil level threshold range, and continuously and automatically compensate the static pressure replenishing oil tank 100; the first pressure change interval during the air pressure compensation process is recorded in real time, and the first pressure change interval and the current spatial environment information are formed into historical training data.

[0083] It should be noted that after the static pressure supplementary oil tank 100 is connected to the transformer, static pressure leak testing begins. The electrical automatic control system automatically compensates for the drop in oil temperature and volume contraction, activating the oil pressure compensation system to ensure the upper limit of static pressure required for constant static pressure. When the oil level in the static pressure supplementary oil tank drops, gas is added to the tank, and the combined pressure of the gas and the remaining oil pressure is used to compensate for the transformer, maintaining a constant pressure value.

[0084] When the oil level in the static pressure replenishment tank drops, gas is filled into the static pressure replenishment tank to add the gas pressure and the remaining oil pressure to the static pressure upper limit, so that the transformer is always maintained within the standard static pressure range.

[0085] The oil pressure compensation method of the static pressure replenishment oil tank 100 is as follows:

[0086] Step S101: closing the valve between the gas compensation tank 300 and the static pressure replenishment oil tank 100 to stop the gas supply from the gas compensation tank 300;

[0087] Step S102: Open the exhaust valve 104 of the static pressure replenishing oil tank 100 to discharge the gas in the static pressure replenishing oil tank 100, then open the high-altitude hanging tank 200 to replenish transformer oil into the static pressure replenishing oil tank 100;

[0088] Step S103: When the exhaust valve of the static pressure replenishing oil tank 100 overflows oil, the exhaust valve 104 is closed, and oil is continued to be added to the static pressure replenishing oil tank 100. When the oil level indicated by the magnetic flap level gauge 102 reaches the upper oil level threshold, the oil filling is stopped, and the valve between the overhead hanging tank 200 and the static pressure replenishing oil tank 100 is closed;

[0089] Step S104: connecting the pipeline between the transformer and the static pressure supplementary oil tank 100.

[0090] It should be noted here that the static pressure replenishing oil tank 100 has a certain volume for storing transformer oil and is connected to the inside of the transformer through a pipeline to maintain the normal operation of the transformer. The oil level in the static pressure replenishing oil tank 100 is relatively high, and oil can be replenished to the inside of the transformer by natural flow or pumping to keep the oil level inside the transformer within a normal range. When used for static pressure sealing experiments, the oil temperature inside the transformer continues to decay, the oil volume will shrink, and the height of the oil column will drop accordingly. The static pressure replenishing oil tank will automatically replenish the oil to maintain the transformer oil level stable, but the amount of oil in the high-altitude hanging tank 200 is limited. The amount of oil in the existing high-altitude hanging tank 200 is obviously not enough to supply the needs of multiple transformers. Therefore, during the experiment, the operator is also required to pay attention to the magnetic flap liquid level gauge 102. Once the magnetic flap liquid level gauge 102 drops, the operator needs to add oil to the static pressure replenishing oil tank to maintain the transformer oil level stable. This is more dependent on the operator's work ability and work attitude. Once the operator makes a mistake, the transformer will leak oil, resulting in the failure of the entire static pressure sealing test. Therefore, air pressure is provided in the static pressure supplementary oil tank 100 through the gas compensation tank 300 to maintain the air pressure inside the transformer stable.

[0091] Specifically, the specific process of filling the static pressure replenishment tank 100 with gas is as follows:

[0092] Step S201: When the oil level in the magnetic flap level gauge 102 is maintained within the oil level threshold range, the power supply of the gas compensation tank 300 is started, so that the gas compensation tank 300 provides gas to the static pressure replenishment tank 100;

[0093] Step S202: Based on the height of the static oil column in the static pressure replenishment oil tank 100, an oil level threshold interval corresponding to the current static pressure replenishment oil tank 100 is obtained. Based on the oil level threshold interval, a static pressure threshold interval corresponding to the current static pressure replenishment oil tank 100 is predicted. The digital pressure controller 103 presets a lower static pressure limit value and an upper static pressure limit value of the static pressure replenishment oil tank 100 according to the static pressure threshold interval.

[0094] Step S203: If the real-time pressure value in the static pressure supplementary oil tank 100 is within the static pressure threshold range, open the valve between the transformer and the static pressure supplementary oil tank 100, and perform air pressure compensation on the static pressure supplementary oil tank 100 according to the real-time pressure value.

[0095] The oil level threshold interval is an interval formed between the oil level lower threshold and the oil level upper threshold, that is, the minimum value in the oil level threshold interval is the oil level lower threshold, and the maximum value in the oil level threshold interval is the oil level upper threshold.

[0096] It should be noted here that the oil level and pressure of the static pressure replenishment tank 100 are monitored by the magnetic flap level gauge 102 and the magnetic assisted electric contact pressure gauge 101, and compensation is performed according to the preset static pressure threshold range to ensure that the static pressure of the static pressure replenishment tank 100 is always within a safe range. The gas compensation tank 300 provides gas to replenish the liquid level in the static pressure replenishment tank 100.

[0097] The specific logic for performing air pressure compensation on the static pressure replenishment tank 100 according to the real-time pressure value is as follows:

[0098] Step S301: Open the gas valve between the dry gas tank 400 and the gas compensation tank 300 to replenish gas into the gas compensation tank 300. The second pressure gauge 301 monitors the measured air pressure value in the gas compensation tank 300 in real time, so that the measured air pressure value in the gas compensation tank 300 reaches a preset buffer air pressure value; the preset buffer air pressure value is 0.1 MPa.

[0099] Step S302: If the measured pressure value in the gas compensation tank 300 is greater than the preset buffer pressure value, the pressure is released through the safety valve 302 so that the measured pressure value in the gas compensation tank 300 reaches the preset buffer pressure value; the specific model of the safety valve 302 is A41 H-16C;

[0100] Step S303: replenishing gas into the static pressure replenishing oil tank 100 through the gas compensation tank 300, so that the pressure in the static pressure replenishing oil tank 100 is maintained within the static pressure threshold range; wherein, during the pressure maintenance process of the transformer static pressure test, the zero-pressure starting solenoid valve 106 is required to be in a normally closed state and the emergency shut-off valve 107 is required to be in a normally open state. The specific model of the zero-pressure starting solenoid valve 106 is 2W-20JF, and the specific model of the emergency shut-off valve 107 is ZCRB;

[0101] Step S304: When the oil pressure inside the transformer decreases due to temperature, volume reduction, and pressure decay, the measured pressure value in the static pressure replenishment tank 100 drops to the lower limit of the transformer static pressure. The digital pressure controller 103 starts to provide a control signal, and the zero-pressure start solenoid valve 106 opens to replenish air into the static pressure replenishment tank 100. The specific model of the digital pressure controller 103 is TL-YLKZ.

[0102] Step S305: When the pressure in the static pressure replenishment oil tank 100 reaches the upper limit of the transformer static pressure, the digital pressure controller 103 starts to provide a control signal, and the zero-pressure start solenoid valve 106 closes the pipeline valve between the static pressure replenishment oil tank 100 and the gas compensation tank 300, cutting off the gas source;

[0103] Step S306 : Continuously and automatically perform air pressure compensation according to the pressure value measured by the magnetic-assisted electric contact pressure gauge 101 in the static pressure replenishment oil tank 100 .

[0104] Among them, when the pressure value in the zero-pressure starting solenoid valve 106 corresponding to the static pressure replenishing oil tank 100 is greater than the safety pressure threshold, the gas pressure in the static pressure replenishing oil tank 100 is released, and the air pressure control module 504 provides a signal to drive the gas emergency shut-off valve 107 to close, cut off the gas source, control the pressure increase, and at the same time control the rotating alarm light 105 to sound an alarm.

[0105] It should be noted here that the safety pressure threshold is lower than the preset buffer air pressure value. Specifically, the preset buffer air pressure value is 0.1 MPa, while the corresponding safety pressure threshold is 0.09 MPa.

[0106] When the rotating alarm light 105 sounds an alarm and the fault is eliminated, the emergency shut-off valve 107 is reset. Here, the fault is mainly eliminated manually, and the red push rod of the gas emergency shut-off valve 107 is manually pulled up to reset it. Of course, it can also be controlled by a resettable emergency shut-off valve 107.

[0107] When the oil level in the static pressure replenishment oil tank 100 drops to the lower oil level threshold, the magnetic flap level gauge 102 sends the corresponding oil level signal in real time, and the air pressure control module 504 drives the rotating alarm light 105 to alarm, the emergency shut-off valve 107 is closed, the air source is cut off, and oil is replenished into the static pressure replenishment oil tank 100.

[0108] It should be noted that the current transformer static pressure constant pressure device has been designed, manufactured, and verified through implementation. Static pressure sealing tests on three transformers have demonstrated that it meets the static pressure constant pressure requirements for 1,500 transformers. This static pressure constant pressure process measures meet the requirements of the GB / T6451-2015 "Technical Parameters and Requirements for Oil-Immersed Power Transformers," which is the standard for static pressure sealing tests on oil-immersed transformers. Automatic and stable compensation is achieved for the static pressure replenishment tank, maintaining the oil level within the appropriate range and ensuring the stability and reliability of equipment operation. Automated control reduces manual intervention, improves work efficiency, reduces the possibility of human error, extends equipment life, and improves work environment safety.

[0109] Example 2

[0110] Please refer to FIG1 . For details not described in this embodiment, please refer to the description of Embodiment 1. This embodiment provides a method for maintaining a constant static voltage of a transformer, including the following steps:

[0111] Used to collect the first pressure value and the first oil level value in the static pressure replenishment tank 100, and collect the second pressure value in the gas compensation tank 300;

[0112] During the oil pressure compensation process of the static pressure replenishment tank 100 using the high-altitude hanging tank 200, the static pressure upper limit value in the static pressure replenishment tank 100 is obtained. If the first pressure value is higher than the static pressure upper limit value, the exhaust valve of the static pressure replenishment tank 100 is closed; the high-altitude hanging tank 200 refuels the static pressure replenishment tank 100 until the first oil level value reaches the preset oil level upper threshold, and the oil filling valve of the static pressure replenishment tank 100 is closed;

[0113] Connecting the static pressure replenishing oil tank 100 to the transformer, performing air pressure compensation in the static pressure replenishing oil tank 100 to ensure that the first oil level value is maintained within a preset oil level threshold range, thereby obtaining an upper limit value of the static pressure in the static pressure replenishing oil tank 100, and obtaining a corresponding static pressure range based on the lower limit value of the static pressure and the upper limit value of the static pressure;

[0114] Based on the changes in the static pressure interval and the preset oil level threshold interval, the static pressure supplementary oil tank 100 is continuously and automatically compensated for the air pressure.

[0115] The first pressure value can be obtained by real-time monitoring of the magnetic-assisted electric contact pressure gauge 101 on the static pressure replenishing oil tank 100; the first oil level value can be obtained by real-time monitoring of the magnetic flap level gauge 102 on the static pressure replenishing oil tank 100; the second pressure value can be obtained by real-time monitoring of the second pressure gauge 301 on the gas compensation tank 300;

[0116] The data monitored by the magnetic-assisted electric contact pressure gauge 101 , the magnetic flap level gauge 102 and the second pressure gauge 301 are transmitted to the data acquisition module 501 in real time.

[0117] The oil pressure compensation method of the static pressure replenishment oil tank 100 is:

[0118] Step S101: closing the valve between the gas compensation tank 300 and the static pressure replenishment oil tank 100 to stop the gas supply from the gas compensation tank 300;

[0119] Step S102: Open the exhaust valve 104 of the static pressure replenishing oil tank 100 to discharge the gas in the static pressure replenishing oil tank 100, then open the high-altitude hanging tank 200 to replenish transformer oil into the static pressure replenishing oil tank 100;

[0120] Step S103: When the exhaust valve of the static pressure replenishing oil tank 100 overflows oil, the exhaust valve 104 is closed, and oil is continued to be added to the static pressure replenishing oil tank 100. When the oil level indicated by the magnetic flap level gauge 102 reaches the upper oil level threshold, the oil filling is stopped, and the valve between the overhead hanging tank 200 and the static pressure replenishing oil tank 100 is closed;

[0121] Step S104: connecting the pipeline between the transformer and the static pressure supplementary oil tank 100.

[0122] The specific process of filling the static pressure replenishment tank 100 with gas is as follows:

[0123] Step S201: When the oil level in the magnetic flap level gauge 102 is maintained within the oil level threshold range, the power supply of the gas compensation tank 300 is started, so that the gas compensation tank 300 provides gas to the static pressure replenishment tank 100;

[0124] Step S202: Based on the height of the static oil column in the static pressure replenishment oil tank 100, an oil level threshold interval corresponding to the current static pressure replenishment oil tank 100 is obtained. Based on the oil level threshold interval, a static pressure threshold interval corresponding to the current static pressure replenishment oil tank 100 is predicted. The digital pressure controller 103 presets a lower static pressure limit value and an upper static pressure limit value of the static pressure replenishment oil tank 100 according to the static pressure threshold interval.

[0125] Step S203: If the real-time pressure value in the static pressure supplementary oil tank 100 is within the static pressure threshold range, open the valve between the transformer and the static pressure supplementary oil tank 100, and perform air pressure compensation on the static pressure supplementary oil tank 100 according to the real-time pressure value.

[0126] The oil level threshold interval is an interval formed between the oil level lower threshold and the oil level upper threshold, that is, the minimum value in the oil level threshold interval is the oil level lower threshold, and the maximum value in the oil level threshold interval is the oil level upper threshold.

[0127] The specific logic for performing air pressure compensation on the static pressure replenishment tank 100 according to the real-time pressure value is as follows:

[0128] Step S301: Open the gas valve between the dry gas tank 400 and the gas compensation tank 300 to replenish gas into the gas compensation tank 300. The second pressure gauge 301 monitors the measured air pressure value in the gas compensation tank 300 in real time, so that the measured air pressure value in the gas compensation tank 300 reaches the preset buffer air pressure value.

[0129] Step S302: If the measured air pressure value in the gas compensation tank 300 is greater than the preset buffer air pressure value, the pressure is released through the safety valve 302 so that the measured air pressure value in the gas compensation tank 300 reaches the preset buffer air pressure value;

[0130] Step S303: replenishing gas into the static pressure replenishment tank 100 through the gas compensation tank 300 so that the pressure in the static pressure replenishment tank 100 is maintained within the static pressure threshold range; wherein, during the transformer static pressure test, the zero pressure start solenoid valve 106 is required to be in a normally closed state and the emergency shut-off valve 107 is required to be in a normally open state during the pressure maintenance process;

[0131] Step S304: When the oil pressure inside the transformer decreases due to temperature, volume reduction, and pressure decay, the measured pressure value in the static pressure supplementary oil tank 100 drops to the lower limit of the transformer static pressure, and the digital pressure controller 103 starts to provide a control signal, and the zero-pressure start solenoid valve 106 opens to replenish air into the static pressure supplementary oil tank 100;

[0132] Step S305: When the pressure in the static pressure replenishment oil tank 100 reaches the upper limit of the transformer static pressure, the digital pressure controller 103 starts to provide a control signal, and the zero-pressure start solenoid valve 106 closes the pipeline valve between the static pressure replenishment oil tank 100 and the gas compensation tank 300, cutting off the gas source;

[0133] Step S306 : Continuously and automatically perform air pressure compensation according to the pressure value measured by the magnetic-assisted electric contact pressure gauge 101 in the static pressure replenishment oil tank 100 .

[0134] When the pressure value in the zero-pressure starting solenoid valve 106 corresponding to the static pressure replenishing oil tank 100 is greater than the safety pressure threshold, the gas pressure in the static pressure replenishing oil tank 106 is released, and the air pressure control module 504 provides a signal to drive the gas emergency shut-off valve 107 to close, cut off the gas source, control the pressure increase, and at the same time control the rotating alarm light 105 to sound an alarm.

[0135] When the oil level in the static pressure replenishment oil tank 100 drops to the lower oil level threshold, the magnetic flap level gauge 102 sends the corresponding oil level signal in real time, and the air pressure control module 504 drives the rotating alarm light 105 to alarm, the emergency shut-off valve 107 is closed, the air source is cut off, and oil is replenished into the static pressure replenishment oil tank 100.

[0136] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0137] It should be understood that determining B based on A does not mean determining B based solely on A. B can also be determined based on A and / or other information.

[0138] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0139] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A transformer static pressure constant voltage device, characterized in that Comprising: A data acquisition module (501) that acquires the spatial environment information of the current static pressure supplementary oil tank (100), and simultaneously acquires the first pressure value and the first oil level value inside the static pressure supplementary oil tank (100); A historical data preprocessing module (502) that pre-collects historical training data required for predicting the static pressure change inside the static pressure supplementary oil tank (100) used for the sealed static pressure test; obtains the static pressure range of the static pressure supplementary oil tank (100) corresponding to the current environment based on the historical training data, and the static pressure range is the range formed between the static pressure lower limit value and the static pressure upper limit value; An oil pressure control module (503) that uses the aerial lifting oil tank (200) to perform oil pressure compensation on the static pressure supplementary oil tank (100). During the oil pressure compensation process, it compares the real-time acquired first pressure value with the static pressure range. If the first pressure value is higher than the static pressure upper limit value, it closes the exhaust valve of the static pressure supplementary oil tank (100), and the aerial lifting oil tank (200) continues to perform oil pressure compensation on the static pressure supplementary oil tank (100) until the first oil level value reaches the preset upper oil level threshold, and then closes the oil injection valve of the static pressure supplementary oil tank (100); A gas pressure control module (504) that connects the static pressure supplementary oil tank (100) to the transformer to perform gas pressure compensation on the inside of the static pressure supplementary oil tank (100). If the first oil level value is lower than the preset lower oil level threshold, it reduces the gas pressure inside the static pressure supplementary oil tank (100). If the first oil level value is higher than the preset upper oil level threshold, it increases the gas pressure inside the static pressure supplementary oil tank (100) to ensure that the first oil level value is maintained within the preset oil level threshold range, and continuously performs automatic gas pressure compensation on the static pressure supplementary oil tank (100); records the first pressure change range during the gas pressure compensation process in real time, and forms historical training data with the current spatial environment information; The historical training data includes the first training data collected in the sealed static pressure test environment; The sealed static pressure test environment is a data collection environment where the tester continuously collects data with the first oil level value inside the static pressure supplementary oil tank (100) maintained within the preset oil level threshold range by controlling the physical factors affecting the oil pressure compensation inside the static pressure supplementary oil tank (100); The first training data includes several groups of static pressure characteristic data and an oil level threshold range; The oil level threshold range is the range formed between the lower oil level threshold and the upper oil level threshold, that is, the minimum value in the oil level threshold range is the lower oil level threshold, and the maximum value in the oil level threshold range is the upper oil level threshold; The static pressure characteristic data includes the real-time compensation oil temperature, ambient temperature, oil pressure compensation rate, oil pressure compensation capacity, and the health degree of the static pressure supplementary oil tank; The static pressure range is the first pressure change range that ensures the first oil level value of the static pressure supplementary oil tank (100) is maintained within the oil level threshold range under the state corresponding to the static pressure characteristic data of the current static pressure supplementary oil tank (100). The first pressure change range is the range formed by the first pressure minimum value and the first pressure maximum value. The first pressure minimum value is less than the first pressure maximum value, and the first pressure minimum value is marked as the static pressure lower limit value, and the first pressure maximum value is marked as the static pressure upper limit value; The specific steps to obtain the static pressure range of the static pressure supplementary oil tank (100) corresponding to the current environment based on historical training data are as follows: Construct a machine learning model. Each set of static pressure feature data in the first training data is used as the input of the machine learning model, and the machine learning model outputs the real-time first pressure value predicted for each set of static pressure feature data; Number the real-time first oil level values in the oil pressure compensation according to the time series. Fit the first pressure value based on the changes in the static pressure feature data and the first oil level value to obtain the degree of influence on the first pressure value; Use the real-time first oil level value corresponding to this set of static pressure feature data as the prediction target, and use minimizing the sum of the prediction errors of all real-time first oil level values as the training target; Train the machine learning model until the sum of the prediction accuracies reaches convergence and then stop training.

2. The static pressure constant voltage device for a transformer according to claim 1, wherein, The oil pressure compensation method for the static pressure supplementary oil tank (100) is as follows: Step S101: Close the valve between the gas compensation tank (300) and the static pressure supplementary oil tank (100) to stop the gas supply of the gas compensation tank (300); Step S102: Open the exhaust valve (104) of the static pressure supplementary oil tank (100) to make the gas in the current static pressure supplementary oil tank (100) in the discharged state. Then start the high-altitude lifting tank (200) and use the high-altitude lifting tank (200) to supplement transformer oil to the static pressure supplementary oil tank (100); Step S103: When the exhaust valve of the static pressure supplementary oil tank (100) overflows with oil, close the exhaust valve (104), continue to inject oil into the static pressure supplementary oil tank (100). When the oil level shown in the magnetic flap level gauge (102) reaches the upper oil level threshold, stop injecting oil and close the valve between the high-altitude lifting tank (200) and the static pressure supplementary oil tank (100); Step S104: Connect the pipeline between the transformer and the static pressure supplementary oil tank (100).

3. The static pressure constant voltage device for a transformer according to claim 2, wherein, The specific process of filling the static pressure supplementary oil tank (100) with gas is as follows: Step S201: When the oil level in the magnetic flap level gauge (102) is maintained within the oil level threshold range, start the power supply of the gas compensation tank (300) to make the gas compensation tank (300) supply gas to the static pressure supplementary oil tank (100); Step S202: Based on the height of the static pressure oil column in the static pressure supplementary oil tank (100), obtain the oil level threshold range corresponding to the current static pressure supplementary oil tank (100). Based on the oil level threshold range, predict the static pressure threshold range corresponding to the current static pressure supplementary oil tank (100). The digital display pressure controller (103) sets the lower limit value and upper limit value of the static pressure of the preset static pressure supplementary oil tank (100) according to the static pressure threshold range; Step S203: If the real-time pressure value in the static pressure supplementary oil tank (100) is within the static pressure threshold range, open the valve between the transformer and the static pressure supplementary oil tank (100) and perform air pressure compensation on the static pressure supplementary oil tank (100) according to the real-time pressure value.

4. A transformer static pressure constant voltage device according to claim 3, characterized in that, The specific logic for performing air pressure compensation on the static pressure supplementary oil tank (100) according to the real-time pressure value is: Step S301: Open the gas valve between the drying gas tank (400) and the gas compensation tank (300) to supplement gas into the gas compensation tank (300). The second pressure gauge (301) monitors the measured air pressure value in the gas compensation tank (300) in real time, so that the measured air pressure value in the gas compensation tank (300) reaches the preset buffer air pressure value; Step S302: If the measured air pressure value in the gas compensation tank (300) is greater than the preset buffer air pressure value, release the pressure through the safety valve (302) so that the measured air pressure value in the gas compensation tank (300) reaches the preset buffer air pressure value; Step S303: Supplement gas into the static pressure supplementary oil tank (100) through the gas compensation tank (300) so that the pressure in the static pressure supplementary oil tank (100) is maintained within the static pressure threshold range; among them, when maintaining the pressure during the static pressure test of the transformer, it is required that the zero-pressure start solenoid valve (106) is in the normally closed state and the emergency cut-off valve (107) is in the normally open state; Step S304: When the oil pressure inside the transformer decreases due to temperature reduction, the volume decreases, and the pressure decays. At this time, the measured pressure value in the static pressure supplementary oil tank (100) drops to the lower limit value of the transformer static pressure. The digital display pressure controller (103) starts to provide a control signal, and the zero-pressure start solenoid valve (106) opens to supplement air into the static pressure supplementary oil tank (100); Step S305: When the pressure in the static pressure supplementary oil tank (100) reaches the upper limit value of the transformer static pressure, the digital display pressure controller (103) starts to provide a control signal, and the zero-pressure start solenoid valve (106) closes the pipeline valve between the static pressure supplementary oil tank (100) and the gas compensation tank (300) to cut off the gas source; Step S306: Perform continuous automatic air pressure compensation according to the pressure value measured by the magnetic-assisted electric contact pressure gauge (101) in the static pressure supplementary oil tank (100).

5. A transformer static pressure constant voltage device according to claim 4, characterized in that, When the pressure value in the zero-pressure start solenoid valve (106) corresponding to the static pressure supplementary oil tank (100) is greater than the safety pressure threshold value, the gas pressure in the static pressure supplementary oil tank (100) is released, and a signal is provided by the air pressure control module (504) to drive the gas emergency cut-off valve (107) to close, cut off the gas source, control the pressure rise, and at the same time control the rotating alarm light (105) to emit an alarm sound.

6. The static pressure constant voltage device for a transformer according to claim 5, characterized in that, When the oil level in the static pressure supplementary oil tank (100) drops to the lower threshold value of the oil level, the magnetic flap level gauge (102) sends the corresponding oil level signal in real time, and the air pressure control module (504) drives the rotating alarm light (105) to alarm and the emergency cut-off valve (107) to close, cut off the gas source, and replenish oil into the static pressure supplementary oil tank (100).

7. A static pressure constant voltage method for a transformer, which is realized based on the static pressure constant voltage device for a transformer described in any one of claims 1-6, characterized in that, Including: Collect the spatial environment information of the current static pressure supplementary oil tank (100), and collect the first pressure value and the first oil level value in the static pressure supplementary oil tank (100) in real time; Pre-collect the historical training data required to predict the static pressure change in the static pressure supplementary oil tank (100) for the sealed static pressure test; obtain the static pressure range of the static pressure supplementary oil tank (100) corresponding to the current environment based on the historical training data, and the static pressure range is the range formed between the lower limit value of the static pressure and the upper limit value of the static pressure; Use an aerial suspension tank (200) to perform oil pressure compensation on the static pressure supplementary oil tank (100). During the oil pressure compensation process, compare the first pressure value collected in real time with the static pressure range. If the first pressure value is higher than the upper limit of the static pressure, close the exhaust valve of the static pressure supplementary oil tank (100), and the aerial suspension tank (200) continues to perform oil pressure compensation on the static pressure supplementary oil tank (100) until the first oil level value reaches the preset upper oil level threshold, and then close the oil injection valve of the static pressure supplementary oil tank (100); Connect the static pressure supplementary oil tank (100) to the transformer to perform air pressure compensation on the static pressure supplementary oil tank (100). If the first oil level value is lower than the preset lower oil level threshold, then reduce the air pressure in the static pressure supplementary oil tank (100). If the first oil level value is higher than the preset upper oil level threshold, then increase the air pressure in the static pressure supplementary oil tank (100) to ensure that the first oil level value is maintained within the preset oil level threshold range, and perform continuous automatic air pressure compensation on the static pressure supplementary oil tank (100); Record the first pressure change range during the air pressure compensation process in real time, and form historical training data with the first pressure change range and the current spatial environment information.

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