A control method, system, device and medium for predicting insulation gas leakage

Abstract

The present invention provides a prediction method, system, device and medium for insulating gas leakage, belonging to the technical field of GIS equipment, the method comprising the following steps: real-time acquisition of the actual pressure in the insulating gas chamber, when it is determined that the actual pressure is less than or equal to a first preset pressure, the acquisition time is marked as the first time, and a historical pressure sequence is obtained, based on the historical pressure sequence, the actual pressure change rate of the actual pressure at each acquisition time is calculated to obtain the first pressure, and when it is determined that the actual pressure change rate of the actual pressure corresponding to the first time when the first pressure drops to the actual pressure corresponding to the first time is greater than the preset pressure change rate, a first warning signal is issued. This method timely discovers the abnormal pressure drop according to the dynamic change trend of the previous pressure in the insulating gas chamber collected by the density relay, and avoids the situation where the pressure drops rapidly but does not drop below the alarm pressure value of the density relay, and the density relay does not respond, resulting in the staff being unable to timely discover the gas leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of GIS electrical equipment, and in particular to a control method, system, equipment and medium for predicting insulation gas leakage. Background Art

[0002] Sulfur hexafluoride (SF 6 ) has excellent insulation and arc extinguishing characteristics and is widely used in electrical equipment such as insulated circuit breakers, gas insulated switchgear, and transformers. However, due to the 6 Gas-insulated equipment may have various defects during manufacturing, installation or operation, resulting in gas leakage, which will have an adverse effect on the operation of electrical equipment. 6 Gas leakage monitoring is a powerful guarantee for the safe operation of electrical equipment.

[0003] In the prior art, a density relay is usually used to detect the SF 6 The density relay has an alarm pressure value. When the pressure value in the insulating gas chamber is lower than the alarm pressure value, the density relay sends an alarm signal to inform the personnel that the gas may leak. Since the density relay cannot send a leakage warning signal in time after the pressure value drops abnormally, there will be a situation where the staff receives the alarm signal of the density relay and then goes to repair it, and the insulating gas has been leaking for a period of time. This delayed maintenance reduces SF 6 The insulation performance of the product may be poor, posing a safety hazard. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present invention aims to provide a control method, system, device and medium for predicting insulation gas leakage.

[0005] A first aspect of the present invention provides a method for predicting insulation gas leakage, comprising the following steps:

[0006] Collecting the actual pressure in the insulating air chamber in real time, and when it is determined that the actual pressure is less than or equal to a first preset pressure, marking the collection moment as a first moment, and acquiring a historical pressure sequence, wherein the historical pressure sequence includes the actual pressure at the first moment and all collection moments before the first moment;

[0007] Based on the historical pressure sequence, an actual pressure change rate of the actual pressure at each collection moment is calculated to obtain a first pressure, where the first pressure is the actual pressure at the collection moment when the actual pressure change rate is greater than a preset pressure change rate for the first time in the historical pressure sequence;

[0008] When it is determined that the actual pressure change rate when the first pressure drops to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, a first warning signal is issued.

[0009] According to the technical solution provided by the embodiment of the present invention, the method further includes the following steps:

[0010] Based on the historical pressure sequence, draw the pressure change curve;

[0011] Based on the pressure change curve, a pressure prediction curve is obtained, and on the pressure prediction curve, a predicted fault time is calibrated, the predicted fault time being the predicted time corresponding to the predicted pressure that is less than or equal to the density relay locking pressure for the first time;

[0012] Dividing the time between the first moment and the predicted failure moment into at least three warning periods;

[0013] The first warning signal is sent out at a first frequency, a second frequency and a third frequency respectively in the three warning time periods, and the first frequency, the second frequency and the third frequency increase in sequence.

[0014] According to the technical solution provided by the embodiment of the present invention, after calculating the actual pressure change rate of the actual pressure at each acquisition moment to obtain the first pressure, the following steps are also included:

[0015] Calibrate the collection time corresponding to the first pressure as the second time, and take the period between the second time and the first time as the first time;

[0016] Acquire a trace water content sequence, wherein the trace water content sequence includes the trace water content at each of the collection moments in the first time period;

[0017] Based on the trace water content sequence, the actual trace water change rate of the trace water content at each collection moment is calculated to obtain a third moment, wherein the third moment is the collection moment when the actual trace water change rate is greater than the preset trace water change rate for the first time;

[0018] Obtaining the moisture content of the external atmosphere at the third moment, and calculating a first reference value, wherein the first reference value is an absolute value of a difference between the moisture content of the external atmosphere at the third moment and the trace water content;

[0019] When it is determined that the actual pressure change rate when the first pressure drops to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, and the first reference value is less than or equal to the second preset threshold, a second warning signal is issued.

[0020] According to the technical solution provided by the embodiment of the present invention, after obtaining the moisture content of the external atmosphere at the third moment and calculating the first reference value, the following steps are also included:

[0021] Based on the trace water content sequence, obtaining a trace water content variation trend of the insulating gas in the insulating gas chamber between the third moment and the first moment;

[0022] When it is determined that the change trend of the trace water content increases to a certain value and keeps the value unchanged, the value is used as the first value and a third warning signal is issued.

[0023] According to the technical solution provided by the embodiment of the present invention, after the first warning signal is issued, after the historical pressure sequence is acquired, and before the actual pressure change rate of the actual pressure at each acquisition moment is calculated based on the historical pressure sequence, the following steps are also included:

[0024] Obtaining a withdrawal / recharge time, where the withdrawal / recharge time is a time when a withdrawal / recharge signal is received;

[0025] According to the amount of gas extracted / refilled, the actual pressures at a subsequent collection time adjacent to the extraction / refilling time and after the collection time are corrected.

[0026] According to the technical solution provided by the embodiment of the present invention, after obtaining the trend of the change of the trace water content between the third moment and the first moment based on the trace water content sequence, the following steps are also included:

[0027] Acquire the outer wall temperature of the insulating air chamber at each collection moment between the third moment and the first moment;

[0028] When it is determined that the outer wall temperature at the collection time corresponding to the first value of the trace water content is less than or equal to the outer wall temperature at other collection times, a fourth warning signal is issued.

[0029] According to the technical solution provided by an embodiment of the present invention, the insulating air chamber is provided in the electrical equipment; the method further comprises obtaining the preset pressure change rate, and obtaining the preset pressure change rate comprises at least the following steps:

[0030] Obtaining operation information of the electrical equipment, wherein the operation information at least includes service life and sampling detection cycle;

[0031] The pressure database is retrieved to obtain the natural pressure change rate corresponding to the operation information, and the natural pressure change rate is used as the preset pressure change rate; the pressure database includes at least a plurality of operation information and the natural pressure change rate corresponding to each operation information.

[0032] A second aspect of the present invention provides a control system for predicting insulation gas leakage, comprising:

[0033] A collection module, wherein the collection module is configured to collect the actual pressure in the insulating air chamber in real time, and when it is determined that the actual pressure is less than or equal to a first preset pressure, the collection moment is marked as a first moment, and a historical pressure sequence is obtained, wherein the historical pressure sequence includes the actual pressure at the first moment and all collection moments before the first moment;

[0034] a calculation module, the calculation module being configured to calculate an actual pressure change rate of the actual pressure at each acquisition moment based on the historical pressure sequence to obtain a first pressure, the first pressure being the actual pressure at the acquisition moment when the actual pressure change rate is greater than a preset pressure change rate for the first time in the historical pressure sequence;

[0035] The early warning module is configured to issue a first early warning signal when it is determined that the actual pressure change rate of the actual pressure corresponding to the first moment when the first pressure drops is greater than the preset pressure change rate.

[0036] A third aspect of the present invention provides a terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method for predicting insulating gas leakage as described above when executing the computer program.

[0037] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program, and when the computer program is executed by a processor, the steps of the control method for predicting insulation gas leakage as described above are implemented.

[0038] Compared with the prior art, the present invention has the following beneficial effects: when judging that the pressure in the insulating gas chamber is less than the first preset pressure, the present invention uses a number of pressure values ​​and collection times collected before the density relay triggers an alarm to obtain a historical pressure sequence, finds the time of the first abnormal pressure drop from the historical pressure sequence, and if the pressure continues to drop at a rate greater than the natural consumption rate from the time of the first abnormal pressure drop to the current moment, an early warning signal is issued. This method timely detects the situation of abnormal pressure drop based on the dynamic change trend of the previous pressure in the insulating gas chamber collected by the density relay, avoids the situation where the pressure drops rapidly but does not drop below the alarm pressure value of the density relay, and the density relay does not respond, resulting in the staff being unable to timely discover gas leakage, thereby reducing SF 6 The amount of gas leakage is reduced, thereby achieving the purpose of reducing greenhouse emissions, while also ensuring that there is sufficient insulating gas in the electrical equipment to ensure insulation effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flowchart of the steps of a control method for predicting insulation gas leakage provided by an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the structure of a control system for predicting insulation gas leakage provided by an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the structure of a terminal device provided in an embodiment of the present invention.

[0042] The text annotations in the figure represent:

[0043] 600. Computer system; 601. CPU; 602. ROM; 603. RAM; 604. Bus; 605. I / O interface; 606. Input part; 607. Output part; 608. Storage part; 609. Communication part; 610. Drive; 611. Removable media. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] Example 1

[0047] As mentioned in the background technology, in view of the problems in the prior art, the present invention proposes a control method for predicting insulation gas leakage, please refer to Figure 1 As shown, the following steps are included:

[0048] S1. Collecting the actual pressure in the insulating air chamber in real time, and when it is determined that the actual pressure is less than or equal to a first preset pressure, marking the collection moment as the first moment, and obtaining a historical pressure sequence, wherein the historical pressure sequence includes the actual pressure at the first moment and all collection moments before the first moment;

[0049] S2. Based on the historical pressure sequence, calculate the actual pressure change rate of the actual pressure at each collection moment to obtain a first pressure, where the first pressure is the actual pressure at the collection moment when the actual pressure change rate is greater than a preset pressure change rate for the first time in the historical pressure sequence;

[0050] S3. When it is determined that the actual pressure change rate when the first pressure drops to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, a first warning signal is issued.

[0051] The method provided in this embodiment can be applied to any electrical equipment equipped with a density relay. Since the gas temperature inside the electrical equipment will change with the seasons or the ambient temperature of the electrical equipment, ordinary pressure gauges cannot accurately monitor the changes in the internal gas pressure. Therefore, a density relay with a temperature compensation function is usually used to achieve pressure monitoring.

[0052] However, the working principle of the current common density relay is: the density relay has a standard gas chamber, which contains a standard amount of insulating gas. The standard gas chamber is connected to the insulating gas chamber. When the pressure in the insulating gas chamber is lower than the pressure in the standard gas chamber, it means that the gas pressure in the insulating gas chamber is too low, triggering an alarm. After receiving the alarm signal, the staff of the power station will check on site to see if there is any gas leakage.

[0053] From the working principle of the density relay, it can be seen that the density relay can only alarm when the pressure is lower than a certain value, and cannot respond to the dynamic situation where the pressure changes too fast. For example, in a specific scenario, the SF 6 The initial pressure of the gas is 0.52Mpa, and the alarm pressure value of the density relay of the electrical equipment is 0.48Mpa. If the pressure has been decreasing at a very slow rate (natural consumption), for example, the daily consumption rate is 0.0027%, that is, the actual air pressure in the insulating gas chamber decreases by 0.0027% every day, which is within the normal range. However, at a certain moment, the actual pressure value becomes 0.50Mpa, and it drops to 0.50Mpa in a very short time. This shows that it is not only the pressure reduction caused by natural consumption, but there may be hidden dangers of gas leakage. At this time, since the actual pressure of the insulating gas chamber of 0.50Mpa is still greater than the alarm pressure value of the density relay of 0.48Mpa, the density relay does not respond to the alarm until the gas leaks to a pressure of 0.48Mpa at a gradually faster leakage rate, and then it starts to alarm. This means that there is an alarm delay, SF 6 The gas has probably been leaking for some time, which not only harms the environment and causes excessive greenhouse gas emissions, but also damages the insulation performance of electrical equipment and poses a safety hazard. 6 Gases also have adverse effects on the health of workers. Therefore, timely detection of sudden and rapid changes in pressure in the insulating gas chamber can help avoid these hazards in advance.

[0054] Based on the above considerations, this embodiment proposes a control method for predicting insulating gas leakage, which collects the actual pressure in the insulating gas chamber read by the density relay in real time. When the actual pressure is less than the first preset pressure (although it drops to a certain value, it does not affect the arc extinguishing insulation function of the insulating gas, and therefore does not affect the normal operation of the electrical equipment), the actual pressures at the first moment and all the collection moments before the first moment are arranged in time sequence to form a historical pressure sequence. Based on the historical pressure sequence, the actual pressure change rate at each collection moment is obtained by dividing the absolute value of the actual pressure difference between the collection moment and the previous collection moment by the time length between the collection moment and the previous collection moment, thereby selecting the first pressure. Considering that the first pressure has a sudden increase in the rate of change, it may be caused by a sudden change in ambient temperature or an instantaneous abnormality of the equipment. Therefore, when it is further judged that the actual pressure still decreases at a rate greater than the preset pressure change rate between the collection moment and the first moment, a first warning signal is issued to inform the staff that there may be a risk of gas leakage and remind the staff to check for safety hazards on site.

[0055] The first preset pressure is greater than the alarm pressure value. Optionally, the SF 6 The initial pressure of the gas is 0.52Mpa, the alarm pressure value of the density relay of the electrical equipment is 0.48Mpa, the first preset pressure is 0.50Mpa, and the preset pressure change rate is the pressure reduction rate of natural consumption, wherein natural consumption can be considered to be caused by the deterioration of the sealing performance of the equipment during processing and operation, or it may be caused by the loss in the process of extracting gas for detection and then refilling it into the insulating gas chamber. The preset pressure change rate can be obtained based on past experience.

[0056] For example, if the currently collected density relay reading is 0.498Mpa, the current moment is the first moment, and the historical pressure sequence obtained from the previous readings of the density relay is [0.519, 0.516, 0.514, 0.506, 0.503, 0.501], the interval between the collection moments corresponding to each two adjacent actual pressures is 60 days. It should be noted that the more actual pressure values ​​in the historical pressure sequence, the smaller the interval, and the higher the calculation accuracy.

[0057] This embodiment is explained based on the above data, and proposes an implementation method for obtaining the actual pressure change rate. By calculating the change rate of every two adjacent actual pressures, 5 adjacent change rates are obtained, and the average value of the 5 adjacent change rates is obtained as the actual pressure change rate, wherein the adjacent change rate is obtained by dividing the absolute value of the difference between two adjacent actual pressures by the actual pressure corresponding to the previous acquisition moment, and then dividing by the interval length. For example, the adjacent change rates of 0.519 and 0.516 are (0.519-0.516) / 0.519 / 30. The actual pressure change rate obtained by the above method is 0.023% per day, which is greater than the preset pressure change rate of 0.0027%. Therefore, the first warning signal is issued at this moment (the first moment).

[0058] In this embodiment, when the pressure in the insulating gas chamber drops to a certain value, the previous rate of pressure change is focused on, and the possible leakage risk is discovered in time through the previous pressure change rate, so that the personnel are warned in advance, the time point for investigation or gas replenishment is moved forward, and the safety risk is prevented before it happens. At the same time, compared with the method of judging by the pressure value at a certain moment read by the density relay, this method analyzes the dynamic change trend through multiple data, and the judgment result is more accurate.

[0059] In addition, during the operation of electrical equipment, the density relay may not work or always work due to some external environmental problems or its own problems. For example, its own anti-vibration performance is not up to standard. After the strong impact of the switch, the pointer is stuck, the contact is permanently invalid, the deviation exceeds the standard, etc., or due to oil leakage, its anti-vibration performance is reduced. After the strong impact of the switch, the pointer is stuck, the contact fails, the deviation exceeds the standard, etc., if the personnel neglects maintenance or the sudden failure causes the density relay to be not repaired, a huge safety accident may occur due to the inaction of the density relay. The first warning signal of the present invention can not only guide the power station personnel to maintain or repair the equipment as soon as possible, but also form a double protection for the electrical equipment together with the density relay, which can avoid the occurrence of major accidents. By collecting the actual pressure read by the density relay, another judgment process is formed, which is parallel to the self-judgment process of the density relay to achieve redundant protection. In this way, even if the density relay fails and is not discovered in time, we can inform the personnel to check and repair in advance through the first warning signal issued by this judgment process, thereby improving the safety performance of the electrical equipment.

[0060] Furthermore, before calculating the actual pressure change rate based on the historical pressure sequence, the method further includes:

[0061] Obtaining a measured pressure sequence and a measured temperature sequence, converting the measured pressure in the measured pressure sequence at the same time by the measured temperature in the measured temperature sequence, to obtain a reference pressure sequence;

[0062] Compare the reference pressure sequence with the historical pressure sequence to obtain the accuracy of the historical pressure sequence, and determine the magnitude of the accuracy of the historical pressure sequence relative to a certain threshold;

[0063] The accuracy is calculated by subtracting the reference pressure of the reference pressure sequence at the same moment from the actual pressure of the historical pressure sequence to obtain the pressure deviation at each moment. The accuracy is the quotient of the larger pressure deviation and the total pressure in the pressure sequence.

[0064] Calculating the actual pressure change rate based on the historical pressure sequence includes at least the following steps:

[0065] When the accuracy of the historical pressure sequence is greater than a certain threshold, the actual pressure change rate is calculated based on the historical pressure sequence.

[0066] The method further includes:

[0067] When the accuracy of the historical pressure sequence is less than or equal to a certain threshold, obtaining usage information of the density relay, the usage information at least including the service life, the last calibration time, and the last fault time;

[0068] When it is determined based on the usage information of the density relay that the density relay is not within the reliable usage period, a reference pressure sequence is used as a historical pressure sequence;

[0069] Arranging the pressure deviations in time sequence to form a pressure deviation sequence;

[0070] When it is determined that at least S deviations in the pressure deviation sequence are equal, a second warning signal is issued, wherein the second warning signal is used to inform the density relay of under-compensation or over-compensation;

[0071] When it is determined that at most S deviations in the pressure deviation sequence are equal, a third warning signal is issued, and the third warning signal is used to inform that the density relay may fail.

[0072] It should be noted that the interval lengths between the collection moments corresponding to any two adjacent actual pressures in the historical pressure sequence may be the same or different.

[0073] Furthermore, if most of the deviations are equal, it can be understood that the pressure measured by the density relay may always be larger or smaller. The measurement error may be caused by the temperature difference between the density relay itself and the average temperature in the gas chamber. At this time, it is only necessary to calibrate the temperature compensation of the density relay. During calibration, temperature compensation can be performed through the measured temperature sequence and deviation.

[0074] Furthermore, if most of the deviations are not equal, it means that the actual pressure measured by the density relay is not related to the reference pressure. If the density relay is not within the reliable service period, it is very likely that the density relay is faulty.

[0075] Furthermore, in theory, the density relay should be installed at a position with the same operating environment temperature as the circuit breaker or GIS body to ensure that its alarm and locking points operate correctly. However, there will always be a certain error with the average temperature of the insulating air chamber. Therefore, the measured temperature sequence provided in this embodiment can also be used as data to characterize the average temperature in the insulating air chamber. When the temperature of the density relay is significantly different from the average temperature, the actual pressure read is corrected.

[0076] Specifically, a temperature sensor and a pressure sensor are installed at several representative positions in the insulating gas chamber to obtain the measured temperature sequence and the measured pressure sequence. The measured temperature sequence is the average value of all temperature sensor readings at each moment, which can be considered as the average temperature of the insulating gas chamber. The measured pressure sequence is the average value of all pressure sensor readings at each moment. Since the pressure of the gas will expand and contract with the change of the ambient temperature, such as when the temperature inside the pressure vessel increases due to sun exposure or heating inside the electrical equipment, or when cold air moves south and the temperature drops sharply, the gas pressure in the enclosed space will also rise and fall under the influence of these factors. Therefore, by setting up another acquisition system (the acquisition system can also select a density relay) and mutually verifying it with the original density relay, the influence of temperature on pressure can be reduced. The density relay can also be verified while monitoring the leakage of the insulating gas to promptly discover the under-compensation, over-compensation or failure of the density relay, and issue a corresponding early warning signal to remind the staff to check.

[0077] In a preferred embodiment, the method further comprises the following steps:

[0078] Based on the historical pressure sequence, draw the pressure change curve;

[0079] Based on the pressure change curve, a pressure prediction curve is obtained, and on the pressure prediction curve, a predicted fault time is calibrated, the predicted fault time being the predicted time corresponding to the predicted pressure that is less than or equal to the density relay locking pressure for the first time;

[0080] Dividing the time between the first moment and the predicted failure moment into at least three warning periods;

[0081] The first warning signal is sent out at a first frequency, a second frequency and a third frequency respectively in the three warning time periods, and the first frequency, the second frequency and the third frequency increase in sequence.

[0082] Specifically, the pressure change curve is established in an XY coordinate system, where the horizontal axis is time and the vertical axis is SF 6 The actual pressure of the gas is plotted, and then the pressure change curve is processed using the ARIMA prediction model (existing technology, which will not be described in detail here) to obtain the predicted pressure at several predicted moments after the first moment, and then obtain the pressure prediction curve.

[0083] Density relay locking pressure is the critical pressure value for the density relay to send out a locking signal. If the actual pressure in the insulating gas chamber drops below the locking pressure, the SF 6 The insulating arc extinguishing performance of the gas has failed. 6 Before the insulating arc extinguishing performance of the gas completely fails, the dispatching staff can conduct inspections and repairs to ensure the safe operation of the electrical equipment. Therefore, the SF 6 The moment when the insulating arc extinguishing performance of the gas fails can be used as the deadline for troubleshooting and maintenance, and can provide effective guidance for dispatching staff to arrange maintenance time.

[0084] For example, the locking pressure value of the density relay is 0.47Mpa. The predicted fault time for the first time when the pressure is less than or equal to 0.47Mpa located in the pressure prediction curve is June 27. This moment (the first moment) is March 27. Therefore, from March 27 to April 26, the first warning signal is issued every 3 days (the first frequency is once every 3 days), from April 27 to May 26, the first warning signal is issued every 2 days (the second frequency is once every 2 days), and from May 27 to June 26, the first warning signal is issued every 1 day (the third frequency is once every 1 day).

[0085] This embodiment obtains the predicted failure time through the pressure prediction curve, which is equivalent to obtaining the maintenance deadline. It not only provides a time limit guidance for scheduling maintenance, but also sends signals of different frequencies according to the distance from the maintenance deadline to represent the urgency, so that the staff can repair as soon as possible, avoiding the situation where the staff cannot be scheduled or ignores the early warning information and causes the maintenance to be delayed. To a certain extent, it avoids the safety hazard of leakage gradually accelerating due to the negligence of the staff to miss the early warning signal and fail to repair it in time.

[0086] In a preferred embodiment, after calculating the actual pressure change rate of the actual pressure at each acquisition moment to obtain the first pressure, the method further comprises the following steps:

[0087] The collection time corresponding to the first pressure is calibrated as the second time, and the period between the second time and the first time is taken as the first time; wherein, compared with the previous actual pressure, the first pressure has a tendency to decrease faster, which may be caused by a small leakage in the insulating air chamber, or may be caused by a transient failure of the equipment or a sudden change in ambient temperature, so this embodiment further determines whether it is caused by a small leakage through the change in the trace water content, specifically:

[0088] A trace water content sequence is obtained, wherein the trace water content sequence includes the trace water content at each of the collection moments in the first time period; specifically, the trace water content can be measured by a trace water sensor.

[0089] Based on the trace water content sequence, the actual trace water change rate of the trace water content at each collection moment is calculated to obtain a third moment, and the third moment is the collection moment when the actual trace water change rate is greater than the preset trace water change rate for the first time; specifically, the trace water content of the insulating gas in the insulating air chamber will fluctuate under normal circumstances, but will not change very frequently, and the change range will not be large. If the actual trace water change rate changes at a certain moment, it may be due to a trace leakage in the insulating air chamber. Under the action of the huge pressure difference between the inside and the outside, the moisture in the atmosphere will gradually penetrate into the gas in the insulating air chamber. Therefore, this embodiment further verifies the accuracy of judging whether there is a leakage in the insulating air chamber by monitoring the change of the trace water content.

[0090] The moisture content of the outside atmosphere at the third moment is obtained, and a first reference value is calculated, where the first reference value is the absolute value of the difference between the moisture content of the outside atmosphere at the third moment and the trace water content; if there is indeed a leak in the insulating air chamber, then after a period of leakage, it is likely that the moisture content in the insulating air chamber tends to be balanced with the moisture content of the outside atmosphere, where the moisture content is the moisture percentage.

[0091] When it is determined that the actual pressure change rate when the first pressure drops to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, and the first reference value is less than or equal to the second preset threshold, a second warning signal is issued.

[0092] Specifically, the second warning signal can have the same warning method and purpose as the first warning signal, except that the triggering condition of the second warning signal is more stringent than that of the first warning signal. The accuracy of predicting insulating gas leakage is also improved by jointly judging the pressure change rate and the changing trend of the trace water content.

[0093] In a preferred embodiment, after obtaining the moisture content of the external atmosphere at the third moment and calculating the first reference value, the following steps are also included:

[0094] Based on the trace water content sequence, obtaining a trace water content variation trend of the insulating gas in the insulating gas chamber between the third moment and the first moment;

[0095] When it is determined that the change trend of the trace water content increases to a certain value and the value remains unchanged within a first preset time period, the value is used as the first value and a third warning signal is issued.

[0096] Furthermore, the change in the trace water content of the insulating gas may be caused by a trace leakage in the insulating gas chamber, or it may be caused by the continuous release of moisture adsorbed by the insulating material on the inner wall of the insulating gas chamber into the insulating gas. Because it is difficult to completely remove the moisture adsorbed in the insulating material during the installation and maintenance dismantling of the equipment, the moisture will be slowly released into the insulating gas during operation. Therefore, if it is the release of these residual moisture, because the amount of residual moisture is constant, the trace water content in the insulating gas will increase to a certain value and will not continue to increase. Therefore, when it is judged that the actual pressure change rate from the first pressure to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, and the first reference value is less than or equal to the second preset threshold value, and when it is judged that the trend of the trace water content change is to increase to a certain value and keep the value unchanged within the first preset time period, a third warning signal is issued to inform the staff that the trace water content of the insulating gas is excessive, which reduces its insulation performance and ventilation operation can be performed.

[0097] In a preferred embodiment, after acquiring the historical pressure sequence and before calculating the actual pressure change rate of the actual pressure at each acquisition moment based on the historical pressure sequence, the following steps are also included:

[0098] Obtaining a withdrawal / recharge time, where the withdrawal / recharge time is a time when a withdrawal / recharge signal is received;

[0099] According to the amount of gas extracted / refilled, the actual pressures at a subsequent collection time adjacent to the extraction / refilling time and after the collection time are corrected.

[0100] Specifically, the sampling / refilling signal at least includes extracting / refilling the amount of insulating gas in the insulating gas chamber;

[0101] Based on the amount of insulating gas extracted / refilled in the insulating gas chamber, a preset pressure change before and after the extraction / refilling is calculated;

[0102] The actual pressure change is obtained by subtracting the actual pressure at the previous collection time adjacent to the extraction / refilling time from the actual pressure at the next collection time adjacent to the extraction / refilling time;

[0103] When it is determined that the absolute value of the difference between the actual pressure change and the preset pressure change is less than or equal to a third preset threshold, the actual pressures at the subsequent collection moment adjacent to the extraction / refilling moment and after the collection moment are corrected based on the actual pressure change to obtain the corrected actual pressure; wherein the third preset threshold is the sampling amount specified by the detection module.

[0104] Specifically, during the use of electrical equipment, due to the deterioration of the sealing effect of the equipment, trace water or oxygen may be mixed into the equipment, which will react with SF 6 The gas undergoes a chemical reaction, making SF 6 Gas decomposition, so during the operation of the equipment, a certain amount of gas will be extracted from the insulating gas chamber to detect and analyze the decomposition characteristics SF 6 In order to respond to the national regulations on greenhouse gas emissions, the gas will be extracted for testing and then the tested SF 6 The gas is refilled into the insulating gas chamber to avoid the problem of the detected gas being discharged into the atmosphere, and to ensure that the amount of gas in the insulating gas chamber will not be excessively reduced due to the detection.

[0105] Therefore, if a certain moment is found to be the sampling / refilling moment, the actual pressure at the collection moment after the sampling / refilling moment will definitely decrease / increase, and the decrease / increase amount is the extraction / refilling amount of the detection module. At this time, if we still calculate the actual pressure change rate by reading the actual pressure, a large error will occur. Therefore, the actual pressure change amount is superimposed on the actual pressure corresponding to the collection moment after the sampling moment, and the actual pressure change amount is subtracted from the actual pressure corresponding to the collection moment after the refilling moment (reflected in the pressure change curve, that is, a section of the curve after the sampling moment is shifted upward by the distance of the actual pressure change amount, and a section of the curve after the refilling moment is shifted downward by the distance of the actual pressure change amount) to obtain the corrected actual pressure.

[0106] This embodiment takes into account that in the actual working conditions of normal operation of electrical equipment, there will be sampling detection and recharging operations, which will affect the gas pressure in the insulating air chamber. Therefore, these influences are avoided to improve the accuracy of the actual pressure change rate. The pressure data corresponding to the actual working conditions is used for calculation, which can truly reflect the changing trend of the gas pressure in the insulating air chamber due to leakage or consumption.

[0107] Furthermore, after the first warning signal is issued, the method further comprises the following steps:

[0108] When it is determined that no maintenance signal is received within the second preset time period, the actual pressure at at least N collection moments within the second preset time period is retrieved, and a pressure reference curve within the second preset time period is plotted; the maintenance signal is a signal that the actual pressure within the insulating air chamber is greater than the first preset pressure for the first time after the first warning signal is issued;

[0109] Calculate the similarity between the pressure reference curve and the pressure prediction curve within the second preset time period. When it is determined that the similarity is less than a second preset threshold, correct the pressure prediction curve after a second moment based on the pressure reference curve, and the second moment is the end moment of the second preset time period.

[0110] Specifically, the maintenance signal can be a feedback signal issued by the maintenance personnel after investigation and maintenance, and the first first warning signal is issued at the first moment. At this time, if the staff receives the first warning signal, they will normally go to the site for investigation and maintenance as soon as possible. However, if there is no maintenance due to some unexpected reasons, after the first moment, the actual pressure will continue to be collected, and based on the actual pressure that continues to be collected, the pressure change curve before the first moment will be continued in real time to obtain the pressure reference curve after the first moment. By comparing the similarity between the pressure reference curve and the pressure prediction curve in real time, the pressure prediction curve is adjusted in time to obtain a more accurate prediction moment.

[0111] This embodiment uses real data dynamically collected to correct the pressure prediction curve in real time, thereby obtaining a predicted fault time of the electrical equipment that is closer to the normal operating conditions, and dynamically adjusting the maintenance time limit.

[0112] Further, the calculating the similarity between the pressure reference curve and the pressure prediction curve within the second preset time period at least comprises the following steps:

[0113] Traversing each of the collection moments within the second preset time length, subtracting the actual pressure on the pressure reference curve at each collection moment from the predicted pressure on the pressure prediction curve to obtain a deviation of the pressure prediction at each collection moment;

[0114] The quotient of the number of the deviations that are less than or equal to the third preset threshold and the total number of all the deviations is calculated, and the ratio is the similarity.

[0115] In a preferred embodiment, after obtaining the variation trend of the trace water content of the insulating gas in the insulating gas chamber between the third moment and the first moment based on the trace water content sequence, the method further comprises the following steps:

[0116] Acquire the outer wall temperature of the insulating air chamber at each collection moment between the third moment and the first moment;

[0117] When it is determined that the outer wall temperature at the collection time corresponding to the first value of the trace water content is less than or equal to the outer wall temperature at other collection times, a fourth warning signal is issued.

[0118] Specifically, when the device is running, the temperature of the device rises or the temperature of the external environment rises, which will cause the temperature of the insulating air chamber to rise. After the temperature rises, the average kinetic energy of the water molecules in the device increases, causing the water molecules originally attached to the device wall or the surface of the insulating part to be released again, which will cause the micro-water content of the insulating gas to increase. Therefore, this embodiment further determines that the change in the micro-water content at the third moment is not caused by temperature change, and excludes the change in micro-water content caused by external factors such as temperature. If the outer wall temperature at the collection moment corresponding to the first value of the micro-water content is less than or equal to the outer wall temperature at other collection moments, it means that the temperature is not the highest when the micro-water content is at the first value, and it is definitely not caused by temperature. If the trace water content increases, it is more likely that the sealing of the insulating air chamber has deteriorated and there may be a leakage. Therefore, when it is judged that the actual pressure change rate from the first pressure to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, and the first reference value is less than or equal to the second preset threshold value, and it is judged that the trend of the trace water content change is to increase to a certain value and keep the value unchanged within a first preset time period, and the outer wall temperature at the collection moment corresponding to the first value of the trace water content is less than or equal to the outer wall temperature at other collection moments, the fourth warning signal is issued to remind the staff that there is a high possibility of leakage in the insulating air chamber at this time, and the equipment needs to be checked or maintained in time.

[0119] In a preferred embodiment, the insulating air chamber is provided in an electrical device; the method further comprises obtaining the preset pressure change rate, wherein obtaining the preset pressure change rate comprises at least the following steps:

[0120] Obtaining operation information of the electrical equipment, wherein the operation information at least includes service life and sampling detection cycle;

[0121] The pressure database is retrieved to obtain the natural pressure change rate corresponding to the operation information, and the natural pressure change rate is used as the preset pressure change rate; the pressure database includes at least a plurality of operation information and the natural pressure change rate corresponding to each operation information.

[0122] Specifically, the longer the service life of the electrical equipment, the worse the sealing effect, the faster the gas reduction rate in the insulating air chamber will be. The shorter the sampling and testing cycle, the more frequent the sampling and testing, the faster the gas reduction rate in the insulating air chamber will be. Therefore, the service life and sampling and testing cycle are both SF 6 An important factor affecting the natural consumption rate of gas.

[0123] This embodiment provides a method for obtaining the preset pressure change rate, by retrieving a pressure database of electrical equipment under normal operating conditions and with the same operating information, to obtain a reference preset pressure change rate.

[0124] Example 2

[0125] Based on Example 1, this example proposes a control system for predicting insulation gas leakage. Please refer to Figure 2 As shown, including:

[0126] A collection module, wherein the collection module is configured to collect the actual pressure in the insulating air chamber in real time, and when it is determined that the actual pressure is less than or equal to a first preset pressure, the collection moment is marked as a first moment, and a historical pressure sequence is obtained, wherein the historical pressure sequence includes the actual pressure at the first moment and all collection moments before the first moment;

[0127] a calculation module, the calculation module being configured to calculate an actual pressure change rate of the actual pressure at each acquisition moment based on the historical pressure sequence to obtain a first pressure, the first pressure being the actual pressure at the acquisition moment when the actual pressure change rate is greater than a preset pressure change rate for the first time in the historical pressure sequence;

[0128] The early warning module is configured to issue a first early warning signal when it is determined that the actual pressure change rate of the actual pressure corresponding to the first moment when the first pressure drops is greater than the preset pressure change rate.

[0129] Example 3

[0130] Please refer to Figure 3As shown, the computer system 600 of the terminal device includes a CPU (central processing unit) 601, which can perform various appropriate actions and processes according to the program stored in the ROM (read-only memory) 602 or the program loaded from the storage part 608 to the RAM (random access memory) 603. In the RAM 603, various programs and data required for system operation are also stored. The CPU 601, the ROM 602 and the RAM 603 are connected to each other through the bus 604. The I / O (input / output) interface 605 is also connected to the bus 604. The following components are connected to the I / O interface 605: an input part 606 including a keyboard, a mouse, etc.; an output part 607 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage part 608 including a hard disk, etc.; and a communication part 609 including a network interface card such as a LAN card, a modem, etc. The communication part 609 performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is mounted on the drive 610 as needed, so that a computer program read therefrom is installed into the storage section 608 as needed.

[0131] In particular, according to an embodiment of the present invention, the above reference process Figure 1 The described process can be implemented as a computer software program. For example, embodiment 1 of the present invention includes a computer program product, which includes a computer program carried on a computer readable medium, and the computer program contains program code for executing the method shown in the flow chart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication part, and / or installed from a removable medium. When the computer program is executed by CPU 601, the above-mentioned functions defined in the present computer system 600 are executed.

[0132] It should be noted that the computer-readable medium shown in the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0133] The flowchart and block diagram in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the system, method and computer program product according to embodiment 1 and embodiment 2 of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0134] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves. The described units or modules may also be arranged in a processor, for example, they may be described as: a processor includes an acquisition module and an early warning module. The names of these units or modules do not, in some cases, limit the units or modules themselves, for example, the acquisition module may also be described as "an acquisition module for real-time acquisition of actual pressure instances in an insulating air chamber".

[0135] Example 4

[0136] As another aspect, the present invention further provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the control method for predicting insulation gas leakage as described in the above embodiment.

[0137] For example, the electronic device may implement Figure 1 As shown in: Step S1, real-time collection of the actual pressure in the insulating air chamber, when it is determined that the actual pressure is less than or equal to the first preset pressure, the collection moment is marked as the first moment, and a historical pressure sequence is obtained, the historical pressure sequence includes the actual pressure at the first moment and all collection moments before the first moment; Step S2, based on the historical pressure sequence, the actual pressure change rate of the actual pressure at each collection moment is calculated to obtain the first pressure, the first pressure being the actual pressure at the collection moment when the actual pressure change rate is greater than the preset pressure change rate for the first time in the historical pressure sequence; S3, when it is determined that the actual pressure change rate of the actual pressure corresponding to the first moment when the first pressure drops is greater than the preset pressure change rate, a first warning signal is issued. For another example, the electronic device can implement each step described in the present invention.

[0138] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments disclosed in the present invention, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0139] In addition, although the steps of the method of the present invention are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0140] Through the description of the above implementations, those skilled in the art can easily understand that the example implementations described here can be implemented by software, or by combining software with necessary hardware.

[0141] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A control method for predicting insulation gas leakage, characterized in that: The following steps are involved: Collecting the actual pressure in the insulating air chamber in real time, and when it is determined that the actual pressure is less than or equal to a first preset pressure, marking the collection time corresponding to when the actual pressure is less than or equal to the first preset pressure as the first time, and obtaining a historical pressure sequence, wherein the historical pressure sequence includes the actual pressure at the first time and all collection times before the first time; Based on the historical pressure sequence, an actual pressure change rate of the actual pressure at each collection moment is calculated to obtain a first pressure, where the first pressure is the actual pressure at the collection moment when the actual pressure change rate is greater than a preset pressure change rate for the first time in the historical pressure sequence; When it is determined that the actual pressure change rate of the first pressure dropping to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, a first warning signal is issued; After calculating the actual pressure change rate of the actual pressure at each acquisition moment to obtain the first pressure, the method further comprises the following steps: Calibrate the collection time corresponding to the first pressure as the second time, and take the period between the second time and the first time as the first time; Acquire a trace water content sequence, wherein the trace water content sequence includes the trace water content at each of the collection moments in the first time period; Based on the trace water content sequence, the actual trace water change rate of the trace water content at each collection moment is calculated to obtain a third moment, wherein the third moment is the collection moment when the actual trace water change rate is greater than the preset trace water change rate for the first time; Obtaining the moisture content of the external atmosphere at the third moment, and calculating a first reference value, wherein the first reference value is an absolute value of a difference between the moisture content of the external atmosphere at the third moment and the trace water content; When it is determined that the actual pressure change rate when the first pressure drops to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, and the first reference value is less than or equal to a second preset threshold value, a second warning signal is issued; After obtaining the moisture content of the external atmosphere at the third moment and calculating the first reference value, the following steps are also included: Based on the trace water content sequence, obtaining a trace water content variation trend of the insulating gas in the insulating gas chamber between the third moment and the first moment; When it is determined that the change trend of the trace water content increases to a certain value and the value remains unchanged within a first preset time period, the value is used as the first value and a third warning signal is issued; After obtaining the variation trend of the trace water content of the insulating gas in the insulating gas chamber between the third moment and the first moment based on the trace water content sequence, the method further comprises the following steps: Acquire the outer wall temperature of the insulating air chamber at each collection moment between the third moment and the first moment; When it is determined that the outer wall temperature at the collection time corresponding to the first value of the trace water content is less than or equal to the outer wall temperature at other collection times, a fourth warning signal is issued.

2. The control method for predicting insulation gas leakage according to claim 1, characterized in that: The method further comprises the following steps: Based on the historical pressure sequence, draw the pressure change curve; Based on the pressure change curve, a pressure prediction curve is obtained, and on the pressure prediction curve, a predicted fault time is calibrated, the predicted fault time being the predicted time corresponding to the predicted pressure that is less than or equal to the density relay locking pressure for the first time; Dividing the time between the first moment and the predicted failure moment into at least three warning periods; The first warning signal is sent out at a first frequency, a second frequency and a third frequency respectively in the three warning time periods, and the first frequency, the second frequency and the third frequency increase in sequence.

3. The control method for predicting insulation gas leakage according to claim 2, characterized in that: After acquiring the historical pressure sequence, and before calculating the actual pressure change rate of the actual pressure at each acquisition moment based on the historical pressure sequence, the following steps are also included: Obtaining a withdrawal / recharge time, where the withdrawal / recharge time is a time when a withdrawal / recharge signal is received; According to the amount of gas extracted / refilled, the actual pressures at a subsequent collection time adjacent to the extraction / refilling time and after the collection time are corrected.

4. The control method for predicting insulation gas leakage according to claim 1, characterized in that: The insulating air chamber is provided in the electrical equipment; the method further comprises obtaining the preset pressure change rate, and obtaining the preset pressure change rate comprises at least the following steps: Obtaining operation information of the electrical equipment, wherein the operation information at least includes service life and sampling detection cycle; The pressure database is retrieved to obtain the natural pressure change rate corresponding to the operation information, and the natural pressure change rate is used as the preset pressure change rate; the pressure database includes at least a plurality of operation information and the natural pressure change rate corresponding to each operation information.

5. A control system for predicting insulation gas leakage, characterized in that: include: A collection module, wherein the collection module is configured to collect the actual pressure in the insulating air chamber in real time, and when it is determined that the actual pressure is less than or equal to a first preset pressure, calibrate the collection moment corresponding to when the actual pressure is less than or equal to the first preset pressure as a first moment, and obtain a historical pressure sequence, wherein the historical pressure sequence includes the actual pressure at the first moment and all collection moments before the first moment; a calculation module, the calculation module being configured to calculate an actual pressure change rate of the actual pressure at each acquisition moment based on the historical pressure sequence to obtain a first pressure, the first pressure being the actual pressure at the acquisition moment when the actual pressure change rate is greater than a preset pressure change rate for the first time in the historical pressure sequence; An early warning module, the early warning module being configured to issue a first early warning signal when it is determined that the actual pressure change rate of the first pressure dropping to the actual pressure corresponding to the first moment is greater than the preset pressure change rate; The computing module is further configured to: Calibrate the collection time corresponding to the first pressure as the second time, and take the period between the second time and the first time as the first time; Acquire a trace water content sequence, wherein the trace water content sequence includes the trace water content at each of the collection moments in the first time period; Based on the trace water content sequence, the actual trace water change rate of the trace water content at each collection moment is calculated to obtain a third moment, wherein the third moment is the collection moment when the actual trace water change rate is greater than the preset trace water change rate for the first time; The computing module is further configured to: Obtaining the moisture content of the external atmosphere at the third moment, and calculating a first reference value, wherein the first reference value is an absolute value of a difference between the moisture content of the external atmosphere at the third moment and the trace water content; When it is determined that the actual pressure change rate when the first pressure drops to the actual pressure corresponding to the first moment is greater than the preset pressure change rate, and the first reference value is less than or equal to a second preset threshold value, a second warning signal is issued; The computing module is further configured to: Based on the trace water content sequence, obtaining a trace water content variation trend of the insulating gas in the insulating gas chamber between the third moment and the first moment; When it is determined that the change trend of the trace water content increases to a certain value and the value remains unchanged within a first preset time period, the value is used as the first value and a third warning signal is issued; The computing module is further configured to: Acquire the outer wall temperature of the insulating air chamber at each collection moment between the third moment and the first moment; When it is determined that the outer wall temperature at the collection time corresponding to the first value of the trace water content is less than or equal to the outer wall temperature at other collection times, a fourth warning signal is issued.

6. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the control method for predicting insulation gas leakage according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium, the computer-readable storage medium having a computer program, characterized in that: When the computer program is executed by a processor, the steps of the control method for predicting insulation gas leakage according to any one of claims 1 to 4 are implemented.

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