Transformer oil bladder sealing detection method, device and computer equipment

Abstract

This application relates to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for testing the sealing performance of a transformer oil bladder. It is applied to a dual-chamber piston cylinder connected to a target transformer. The method includes: controlling the piston to an initial position using a gas supply device and acquiring an initial measurement value when the piston is in the initial position; acquiring a target measurement value after injecting a detection pressure into the oil bladder of the target transformer; determining the change in measurement value based on the difference between the initial and target measurement values, whereby the change in measurement value includes at least one of the changes in oil bladder pressure, oil chamber pressure, and piston displacement; and performing a sealing performance test on the oil bladder of the target transformer based on the change in measurement value to obtain the oil bladder sealing result. This method enables the testing of the oil bladder's sealing performance using transformer oil.

Description

Technical Field

[0001] This application relates to the field of condition monitoring and fault diagnosis technology for high-voltage power equipment, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for detecting the sealing performance of transformer oil bladders. Background Technology

[0002] For large power transformers equipped with oil-filled air bladders, the sealing performance of the oil bladder is a key indicator for ensuring the safe and stable operation of the transformer. If the oil bladder leaks, outside air and moisture will directly seep into the transformer oil, leading to a decrease in the insulation performance of the transformer oil. Under long-term operation, this may even cause major safety accidents such as insulation breakdown. Therefore, it is necessary to accurately test the sealing performance of the oil bladder before the transformer is put into operation and during operation and maintenance, and to promptly identify and eliminate potential leakage hazards.

[0003] In related technologies, gas is usually used as a detection medium to detect the sealing of the oil bladder. However, when the oil bladder leaks, the first thing that happens is the loss of gas mass inside the oil bladder. Since gas is compressible, the pressure drop signal needs to accumulate enough gas mass loss before it can be detected by the pressure gauge. Therefore, a small leak cannot cause a measurable pressure change in a short period of time. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for testing the sealing performance of transformer oil bladders using transformer oil, in order to address the aforementioned technical problems.

[0005] In a first aspect, this application provides a method for detecting the sealing performance of a transformer oil bladder, applied to a dual-chamber piston cylinder. The dual-chamber piston cylinder is connected to a target transformer and includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is located between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil bladder of the target transformer for storing transformer oil. The method includes:

[0006] Using a gas supply device, the piston is controlled to be in an initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0007] After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of the target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value.

[0008] The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement.

[0009] Based on the change in measured values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing results are obtained.

[0010] In one embodiment, the piston is controlled to be in an initial position via a gas supply device, and initial measurement values ​​are obtained when the piston is in the initial position, including:

[0011] The position of the piston is acquired by a distance measuring device. If the position is not at the initial position, the piston is controlled to be at the initial position by a gas supply device, and the initial piston displacement measurement value is acquired by the distance measuring device, wherein the distance measuring device is located on the side of the dual-chamber piston cylinder.

[0012] Acquire the initial oil bladder pressure measurement value and the initial oil chamber pressure measurement value collected by the pressure measurement device.

[0013] In one embodiment, after injecting detection pressure into the oil bladder of the target transformer, acquiring the target measurement value includes:

[0014] After injecting the detection pressure into the oil bladder of the target transformer, determine the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer is stable, determine the target oil cavity pressure measurement value when the oil cavity pressure is stable, and determine the target piston displacement measurement value when the piston position is stable.

[0015] In one embodiment, when the measured change includes the change in oil bladder pressure, the oil bladder of the target transformer is tested for sealing based on the detected change to obtain the oil bladder sealing result, including:

[0016] Determine the trend of oil bladder pressure change based on the amount of pressure change;

[0017] Based on the oil bladder pressure change trend, the sealing status of the target transformer's oil bladder is obtained through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing status.

[0018] The sealing result of the oil bladder is determined based on its sealing condition.

[0019] In one embodiment, when the measured change includes the change in oil chamber pressure, the oil bladder of the target transformer is tested for sealing based on the measured change to obtain the oil bladder sealing result, including:

[0020] Determine the trend of oil chamber pressure change based on the amount of pressure change in the oil chamber;

[0021] Based on the sealing status of the oil bladder and the pressure change trend of the oil chamber, the sealing status of the oil circuit between the oil chamber and the oil bladder is determined. The sealing status of the oil bladder is based on the pressure change trend of the oil bladder and is obtained through the mapping relationship between the pressure change trend of the oil bladder and the sealing status of the oil bladder. The pressure change trend of the oil bladder is determined based on the amount of pressure change of the oil bladder.

[0022] The sealing result of the oil bladder is determined based on the sealing status of the oil circuit.

[0023] In one embodiment, when the measured change includes the piston displacement change, the oil bladder of the target transformer is tested for sealing based on the measured change to obtain the oil bladder sealing result, including:

[0024] Determine the trend of piston displacement change based on the amount of piston displacement change;

[0025] Based on the sealing state of the oil bladder and the change in piston displacement, the sealing state of the oil bladder body is determined. The sealing state of the oil bladder is based on the trend of oil bladder pressure change, which is obtained through the mapping relationship between the trend of oil bladder pressure change and the sealing state of the oil bladder. The trend of oil bladder pressure change is determined based on the amount of oil bladder pressure change.

[0026] The sealing result of the oil bladder is determined based on the sealing condition of the oil bladder body.

[0027] In one embodiment, the method further includes:

[0028] When the oil bladder sealing result indicates that the oil bladder is in a state of leakage due to the body seal, the volume shrinkage caused by the oil bladder leakage is calculated based on the piston displacement change and the piston cross-sectional area.

[0029] Secondly, this application also provides a transformer oil bladder sealing performance testing device, applied to a dual-chamber piston cylinder. The dual-chamber piston cylinder is connected to the target transformer. The dual-chamber piston cylinder includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is located between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil bladder of the target transformer for storing transformer oil. The device includes:

[0030] The control module is used to control the piston to the initial position through the gas supply device and to acquire the initial measurement value when the piston is in the initial position. The initial measurement value includes at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0031] The acquisition module is used to acquire target measurement values ​​after injecting detection pressure into the oil bladder of the target transformer. The target measurement values ​​include at least one of the target oil bladder pressure measurement value, the target oil cavity pressure measurement value, and the target piston displacement measurement value.

[0032] The determination module is used to determine the change in measurement value based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the changes in oil bladder pressure, oil chamber pressure, and piston displacement.

[0033] The detection module is used to perform a sealing test on the oil bladder of the target transformer based on the change in the measured value, and obtain the sealing result of the oil bladder.

[0034] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0035] Using a gas supply device, the piston is controlled to be in an initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0036] After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of the target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value.

[0037] The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement.

[0038] Based on the change in measured values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing results are obtained.

[0039] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0040] Using a gas supply device, the piston is controlled to be in an initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0041] After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of the target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value.

[0042] The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement.

[0043] Based on the change in measured values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing results are obtained.

[0044] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0045] Using a gas supply device, the piston is controlled to be in an initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0046] After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of the target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value.

[0047] The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement.

[0048] Based on the change in measured values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing results are obtained.

[0049] The aforementioned transformer oil bladder sealing test method, apparatus, computer equipment, computer-readable storage medium, and computer program product are applied to a dual-chamber piston cylinder. The dual-chamber piston cylinder is connected to the target transformer and includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is located between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil bladder of the target transformer for storing transformer oil. By setting up a dual-chamber piston cylinder, the incompressibility of the transformer oil can be utilized to achieve a rigid, instantaneous, and non-attenuating transmission of oil bladder volume changes into piston displacement. In addition, by using a gas supply device, the piston is controlled to be in the initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil cavity pressure measurement value, and the initial piston displacement measurement value. After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained. The target measurement values ​​include at least one of the target oil bladder pressure measurement value, the target oil cavity pressure measurement value, and the target piston displacement measurement value. Based on the difference between the initial measurement values ​​and the target measurement values, the change in measurement values ​​is determined. The change in measurement values ​​includes at least one of the change in oil bladder pressure, the change in oil cavity pressure, and the change in piston displacement. Based on the change in measurement values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing result is obtained. The above-described process quickly obtains the change in the live measured value by the difference between the initial and target measured values, and finally completes the sealing test directly based on the change in the measured value. Compared with the detection method that relies on pressure changes and uses gas as the detection medium, this method can capture the volume change caused by a small leak in the oil bladder in a short time. It can output the detection result without waiting for the pressure to accumulate, effectively improving the sensitivity and efficiency of the small leak detection. It can promptly detect potential leaks in the transformer oil bladder and ensure the safe operation of the target transformer. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of an apparatus for testing the sealing performance of an oil bladder using air in one embodiment;

[0052] Figure 2 This is an application environment diagram of the transformer oil bladder sealing test method in one embodiment;

[0053] Figure 3 This is a schematic diagram of a dual-chamber piston cylinder in one embodiment;

[0054] Figure 4 This is a schematic diagram of an apparatus for testing the sealing performance of a transformer oil bladder in one embodiment;

[0055] Figure 5 This is a flowchart illustrating a transformer oil bladder sealing test method in one embodiment;

[0056] Figure 6 This is a flowchart illustrating the transformer oil bladder sealing test method in another embodiment;

[0057] Figure 7 This is a structural block diagram of a transformer oil bladder sealing test device in one embodiment;

[0058] Figure 8 This is an internal structural diagram of a computer device in one embodiment.

[0059] Explanation of reference numerals in the attached drawings: Target transformer 102, oil bladder 104, transparent long tube 106, air inlet valve 108, pressure measuring device 110, air source 112, oil valve 114, double-chamber piston cylinder 204, oil chamber 302, air chamber 304, piston 306, exhaust valve 308, distance measuring device 310, oil inlet port 312, air inlet port 314, gas supply device 402. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0061] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0062] For large power transformers equipped with oil-filled gas bladders, the sealing performance of the oil bladder is a key indicator for ensuring the safe and stable operation of the transformer. Current oil bladder sealing performance testing technologies generally use gas as the testing medium. Related technologies, such as... Figure 1As shown, the device for testing the oil bladder's sealing performance using air includes a target transformer 102, an oil bladder 104, a transparent long tube 106, an air inlet valve 108, a pressure measuring device 110, and an air source 112. Dry air or nitrogen at a certain pressure is injected into the oil bladder 104 through the air inlet valve 108 using the air source 112. At this time, the oil pressure inside the target transformer 102 increases due to the expansion of the oil bladder 104. A transparent long tube 106 is connected to the outside of the oil bladder 104. The oil is pushed into the tube by the pressure of the oil bladder 104, eventually balancing the static pressure of the oil column in the transparent long tube 106 with the oil pressure inside the target transformer 102. After pressurization, the air inlet valve 108 is closed to maintain the pressure, while simultaneously observing the readings of the pressure measuring device 110 and the change in the oil column height in the externally connected transparent long tube 106. During the pressure holding period, if the reading of the pressure measuring device 110 decreases and the oil column height in the transparent tube 106 decreases synchronously, it is determined that the oil bladder is leaking; if only the oil column height in the transparent tube 106 changes while the reading of the pressure measuring device 110 remains unchanged, then there is temperature interference, etc.

[0063] The aforementioned method of using air to test the oil bladder's seal, while reflecting oil pressure through the external transparent tube 106, is still affected by the delayed transmission of gas pressure within the bladder. This is because the pressure within the bladder is transmitted through the gas acting on the oil surface before reaching the oil. There is a pressure equilibrium time between the gas and oil; the transmission is not instantaneous. Furthermore, due to the compressibility of gas and the linear relationship between signal strength and leakage when directly measuring pressure or oil column height, there is no amplification, resulting in low detection sensitivity. Therefore, even minor leaks are unlikely to cause measurable pressure changes in a short time. Moreover, for ease of operation, the pressure gauge and oil column tube are typically connected to the bladder's inflation port and deflation valve via a flexible hose several meters long. This connection increases the total volume of the monitored system, further diluting the pressure signal. Simultaneously, friction resistance exists along the flow of gas or oil within the pipe, causing changes in pressure or oil column height to lag behind the actual state of the bladder, forcing a prolonged pressure holding time. Furthermore, gas pressure is extremely sensitive to temperature, and fluctuations in ambient temperature can easily lead to misjudgments. Even when combined with oil column height for judgment, the two are affected by temperature differently, making complete synchronous compensation difficult. Finally, the external long pipe allows the transformer oil to directly contact the air, causing the oil to absorb moisture and oxidize, resulting in a decrease in insulation performance.

[0064] To address the aforementioned problems, this application provides a method for detecting the sealing performance of a transformer oil bladder, which can be applied to applications such as... Figure 2In the application environment shown, the dual-chamber piston cylinder 204 is connected to the target transformer 102. The dual-chamber piston cylinder 204 includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is placed between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil sac 104 of the target transformer 102 for storing transformer oil. Terminal 202 communicates with the dual-chamber piston cylinder 204 and the target transformer 102 connected to the dual-chamber piston cylinder 204 via a network, and performs the following operations: Using a gas supply device, it controls the piston of the dual-chamber piston cylinder 204 to be in an initial position, and acquires initial measurement values ​​when the piston is in the initial position. These initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil cavity pressure measurement value, and the initial piston displacement measurement value. After injecting detection pressure into the oil bladder 104 of the target transformer 102, it acquires target measurement values, including at least one of the target oil bladder pressure measurement value, the target oil cavity pressure measurement value, and the target piston displacement measurement value. Based on the difference between the initial measurement value and the target measurement value, it determines the change in measurement value, including at least one of the change in oil bladder pressure, the change in oil cavity pressure, and the change in piston displacement. Based on the change in measurement value, it performs a sealing test on the oil bladder 104 of the target transformer 102 to obtain the oil bladder sealing result.

[0065] Terminal 202 can be, but is not limited to, various personal computers, laptops, smartphones, tablets, drones, low-altitude aircraft, IoT devices, and portable wearable devices. IoT devices can include smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, projection devices, etc. Portable wearable devices can include smartwatches, smart bracelets, head-mounted devices, etc. Head-mounted devices can include virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, etc.

[0066] In one exemplary embodiment, such as Figure 5 As shown, a method for testing the sealing performance of a transformer oil bladder is provided. Figure 2 Taking the application of terminal 202 in the dual-chamber piston cylinder 204 as an example, the following explanation is provided: Figure 3 and Figure 4 As shown, a dual-chamber piston cylinder 204 is connected to the target transformer 102. The dual-chamber piston cylinder 204 includes an oil chamber 302, a gas chamber 304, and a piston 306. The oil chamber 302 is located above the gas chamber 304, and the piston 306 is positioned between the gas chamber 304 and the oil chamber 302. The gas chamber 304 is connected to a gas supply device 402 for storing gas, and the oil chamber 302 is connected to the oil sac 104 of the target transformer 102 for storing transformer oil. The method includes steps 502 to 508. Wherein:

[0067] Step 502: Using a gas supply device, control the piston to be in the initial position and obtain the initial measurement value when the piston is in the initial position. The initial measurement value includes at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0068] The initial position refers to the piston 306 being in the middle position of the dual-chamber piston cylinder 204 when the pressures in the oil chamber 302 and the gas chamber 304 are balanced. The gas supply device 402 can be a gas cylinder. The initial measurement value refers to the data obtained by pressure measurement or displacement measurement when the piston is in the initial position. The initial oil bladder pressure measurement value is the pressure of the oil bladder obtained by pressure measurement when the piston is in the initial position; the initial oil chamber pressure measurement value is the pressure of the oil chamber obtained by pressure measurement when the piston is in the initial position; and the initial piston displacement measurement value is the displacement reading of the piston position from the reference point obtained by displacement measurement when the piston is in the initial position.

[0069] For example, the dual-chamber piston cylinder 204 is a vertical cylindrical sealed container, and the specific size is not limited here. The piston 306 divides the inside of the cylinder into an oil chamber above the piston and an air chamber below the piston. The cylinder can be a transparent cylinder for observing whether the oil inside the cylinder is full or whether there are air bubbles.

[0070] Optionally, due to the extremely low compressibility of transformer oil, using it instead of gas as the signal transmission medium allows the volume change of the oil bladder 104 to be transmitted instantaneously in the form of rigid displacement. The oil chamber 302 is connected to the oil valve 114 of the target transformer 102 via a rigid metal pipe. The oil chamber 302, used to contain transformer oil, is the direct channel for pressure transmission. Furthermore, a high-precision pressure measuring device 110 for monitoring oil pressure changes is installed on the top of the oil chamber 302. Additionally, an umbrella-shaped venting cover is installed on the top of the oil chamber 302, with its surface covered with laser micropores for complete venting when transformer oil is injected into the oil chamber 302. The top cover has an oil inlet 312 and an exhaust valve 308, with the exhaust valve 308 positioned at the highest point of the umbrella-shaped cover.

[0071] For example, the air chamber 304 is used to provide adjustable gas pressure to balance the oil pressure in the oil chamber, so that the piston 306 is in the intermediate position. The air chamber 304 is provided with an air inlet 314 and a pressure sensor, and a liquid collection tank is provided at the bottom of the air chamber to collect any trace amounts of oil that may leak out.

[0072] For example, in response to the piston initial position control command, the gas supply device 402 is controlled to inject gas into the gas chamber 304 through the air inlet 314 until the pressure collected by the pressure sensor on the gas chamber 304 reaches the preset pressure, i.e. The gas can be nitrogen or dry air. Specifically, the formula for calculating the preset pressure is:

[0073]

[0074] in, This is the difference between the oil level in the oil reservoir and the height of the drain valve. The typical value is 0.6 bar.

[0075] Furthermore, in response to the piston initial position control command, while the gas supply device 402 injects gas into the gas chamber 304 through the gas inlet 314, the oil inlet 312 is opened, and transformer oil is injected into the oil chamber 302 under static pressure. The oil fills from bottom to top, driving the air in the oil chamber 302 upwards to the umbrella-shaped gas collecting hood. The air is then gathered by the conical surface of the umbrella-shaped hood to the top exhaust valve 308. The exhaust valve 308 is opened until a continuous flow of pure oil overflows, i.e., when there are no air bubbles, the exhaust valve 308 is immediately closed. Specifically, there must be absolutely no residual gas in the oil chamber 302; otherwise, the compressible gas will absorb the piston displacement signal.

[0076] For example, the oil bladder pressure and oil chamber pressure are collected in real time by the pressure measuring device 110, and the initial oil bladder pressure measurement value and the initial oil chamber pressure measurement value are obtained when the piston 306 is in the initial position based on the collected oil bladder pressure and oil chamber pressure.

[0077] Step 504: After injecting detection pressure into the oil bladder of the target transformer, obtain the target measurement value, which includes at least one of the target oil bladder pressure measurement value, the target oil cavity pressure measurement value, and the target piston displacement measurement value.

[0078] The detection pressure is used to verify the sealing performance of the oil bladder 104 under the rated operating pressure of the target transformer 102. The target measured value refers to the data obtained by pressure or displacement measurement after the piston stabilizes following the injection of the detection pressure. The target oil bladder pressure measured value refers to the pressure of the oil bladder 104 obtained by pressure measurement after the piston stabilizes following the injection of the detection pressure. The target oil chamber pressure measured value refers to the pressure of the oil chamber obtained by pressure measurement after the piston stabilizes following the injection of the detection pressure. The target piston displacement measured value refers to the displacement reading of the piston position from the reference point obtained by displacement measurement after the piston stabilizes following the injection of the detection pressure.

[0079] For example, an air source 112 injects dry air or nitrogen at a certain pressure into the oil bladder 104 through the air inlet valve 108 as the detection pressure, typically 0.5 bar gauge pressure.

[0080] For example, after the detection pressure is injected into the oil bladder 104 of the target transformer 102, the oil bladder 104 expands, squeezing the transformer oil, causing the pressure in the entire oil circuit of the target transformer 102 to increase. At this time, the pressure increase value is... The incompressible transformer oil instantaneously and without attenuation transfers pressure to the upper surface of piston 306. Piston 306 senses the downward static pressure and moves downward until the pressure in air chamber 304 increases to reach a new pressure equilibrium.

[0081] Furthermore, based on the pressure and position data collected in real time by the pressure measuring device 110 and the distance measuring device 310, the target oil bladder pressure measurement value of the oil bladder 104, the target oil chamber pressure measurement value of the oil chamber 302, and the target piston displacement measurement value of the piston 306 are obtained when a new pressure balance is reached.

[0082] Step 506: Based on the difference between the initial measurement value and the target measurement value, determine the change in measurement value. The change in measurement value includes at least one of the changes in oil bladder pressure, oil chamber pressure, and piston displacement.

[0083] The measured changes reflect the changes in system parameters caused by changes in the oil bladder volume. The oil bladder pressure change is the difference between the initial and target oil bladder pressure measurements; the oil chamber pressure change is the difference between the initial and target oil chamber pressure measurements; and the piston displacement change is the difference between the initial and target piston displacement measurements.

[0084] Optionally, the difference between the initial measurement and the target measurement can be at least one of the following: the difference between the initial oil bladder pressure measurement and the target oil bladder pressure measurement, the difference between the initial oil chamber pressure measurement and the target oil chamber pressure measurement, and the difference between the initial piston displacement measurement and the target piston displacement measurement.

[0085] Step 508: Based on the change in the measured value, perform a sealing test on the oil bladder of the target transformer to obtain the oil bladder sealing result.

[0086] The oil bladder sealing result is used to indicate whether there is leakage in the oil bladder body, oil bladder interface and related sealing components.

[0087] For example, the trend of the measured value change is determined based on the amount of change in the measured value, including the trend of change in oil bladder pressure, the trend of change in oil chamber pressure, and the trend of change in piston displacement; the sealing state of oil bladder 104 is determined based on the trend of change in the measured value, and the sealing result of oil bladder 104 is determined based on the sealing state of oil bladder 104.

[0088] Furthermore, when both the oil bladder pressure and oil chamber pressure trends are decreasing, and the piston displacement trend is upward retraction, the oil bladder sealing result is determined to be that the oil bladder body is in a leaking state; when the oil bladder pressure trend changes, while the oil chamber pressure and piston displacement trends remain basically unchanged, the oil bladder sealing result is determined to be that the oil bladder body, oil bladder interface, and related sealing components are in good sealing condition.

[0089] In the aforementioned method for testing the sealing performance of transformer oil bladders, this method is applied to a dual-chamber piston cylinder. The dual-chamber piston cylinder is connected to the target transformer and includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is located between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil bladder of the target transformer for storing transformer oil. By setting up a dual-chamber piston cylinder, the incompressibility of transformer oil can be utilized to achieve a rigid, instantaneous, and non-attenuating transmission of oil bladder volume changes into piston displacement. In addition, by using a gas supply device, the piston is controlled to be in the initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil cavity pressure measurement value, and the initial piston displacement measurement value. After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained. The target measurement values ​​include at least one of the target oil bladder pressure measurement value, the target oil cavity pressure measurement value, and the target piston displacement measurement value. Based on the difference between the initial measurement values ​​and the target measurement values, the change in measurement values ​​is determined. The change in measurement values ​​includes at least one of the change in oil bladder pressure, the change in oil cavity pressure, and the change in piston displacement. Based on the change in measurement values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing result is obtained. The above-described process quickly obtains the change in the live measured value by the difference between the initial and target measured values, and finally completes the sealing test directly based on the change in the measured value. Compared with the detection method that relies on pressure changes and uses gas as the detection medium, this method can capture the volume change caused by a small leak in the oil bladder in a short time. It can output the detection result without waiting for the pressure to accumulate, effectively improving the sensitivity and efficiency of the small leak detection. It can promptly detect potential leaks in the transformer oil bladder and ensure the safe operation of the target transformer.

[0090] In an exemplary embodiment, the piston is controlled to be in an initial position by a gas supply device, and initial measurement values ​​are obtained when the piston is in the initial position. This includes: obtaining the piston position collected by a distance measuring device; if the position is not in the initial position, the piston is controlled to be in the initial position by a gas supply device, and initial piston displacement measurement values ​​are collected by a distance measuring device, wherein the distance measuring device is located on the side of the dual-chamber piston cylinder; and obtaining initial oil bladder pressure measurement values ​​and initial oil chamber pressure measurement values ​​collected by a pressure measuring device.

[0091] The distance measuring device 310 can be a laser rangefinder. The pressure measuring device 110 is a pressure sensor or a pressure gauge.

[0092] For example, the distance measuring device 310, which is located on the side of the dual-chamber piston cylinder 204, is collected in real time. If the position is not in the initial position, the nitrogen pressure in the gas chamber 304 is finely adjusted by controlling the gas supply device 402 to control the piston 306 to move to the initial position.

[0093] Optionally, the initial oil bladder pressure measurement value and the initial oil cavity pressure measurement value can be obtained from the oil bladder pressure and oil cavity pressure collected in real time by the pressure measuring device 110.

[0094] In this embodiment, the piston position is obtained in real time by a distance measuring device, and the piston is stably controlled at the initial position by fine-tuning the gas chamber pressure with the help of a gas supply device, so as to avoid the piston displacement deviation from interfering with the subsequent test results. At the same time, the initial pressure parameters are directly obtained by relying on a high-precision pressure measuring device, which ensures the accuracy of the initial test parameters and provides reliable basic data for subsequent sealing judgment.

[0095] In one embodiment, after injecting detection pressure into the oil bladder of the target transformer, obtaining target measurement values ​​includes: after injecting detection pressure into the oil bladder of the target transformer, determining the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer is stable, determining the target oil cavity pressure measurement value when the oil cavity pressure is stable, and determining the target piston displacement measurement value when the piston position is stable.

[0096] For example, after the detection pressure is injected into the oil bladder 104 of the target transformer 102, due to the incompressibility of the transformer oil, the entire oil circuit system is equivalent to a rigid connecting rod. Any volume change of the oil bladder 104 will be immediately and equally transmitted to the oil chamber to drive the piston to move.

[0097] For example, after injecting detection pressure into the oil bladder 104 of the target transformer 102, during the pressure holding phase, the piston displacement, oil cavity pressure, and oil bladder pressure are simultaneously monitored. Based on the piston displacement, oil cavity pressure, and oil bladder pressure during the pressure holding phase, the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer 102's oil bladder 104 is stable, the target oil cavity pressure measurement value when the oil cavity pressure is stable, and the target piston displacement measurement when the position of piston 316 is stable are determined. Further, the typical duration of the pressure holding phase is 30 to 60 minutes.

[0098] In this embodiment, after injecting the detection pressure, the target measurement value is collected only after the parameters have reached a stable state. This avoids parameter errors caused by incomplete pressure transmission or the piston not reaching the equilibrium position during the detection process, further improving the accuracy of the sealing test results and avoiding misjudgments caused by improper parameter acquisition timing.

[0099] In one embodiment, when the measured change includes the change in oil bladder pressure, the sealing performance of the oil bladder of the target transformer is tested based on the detected change to obtain the oil bladder sealing result. This includes: determining the oil bladder pressure change trend based on the oil bladder pressure change; obtaining the sealing state of the oil bladder of the target transformer based on the oil bladder pressure change trend and the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state; and determining the oil bladder sealing result based on the oil bladder sealing state.

[0100] The sealing status of the oil bladder includes both a leaking seal and a intact seal. A leaking seal indicates leakage in one of three areas: the oil bladder body itself, the external inflation side, or the inflation circuit. An intact seal indicates that the oil bladder body, the external inflation side, and the inflation circuit are all properly sealed. The leaking seal is defined as one of these three conditions, while the intact seal is defined as a seal in one of three conditions: a leaking seal in the oil bladder body itself, a leaking seal in the external inflation side, or a leaking seal in the inflation circuit. The oil bladder body leakage status indicates a leak in the oil bladder body itself; the oil bladder external inflation side seal leakage status indicates a leak on the external inflation side of the oil bladder, which may occur at the inflation pipe or joint; the oil bladder inflation circuit seal leakage status indicates a leak in the oil bladder inflation circuit, while the oil bladder body itself is not leaking, but a leak may occur in the oil bladder pressure gauge line; the seal is intact status indicates that there is no leak in the entire system; the oil temperature change status indicates that there is no leak in the entire system, but there may be problems with excessively high oil temperature or sensor malfunction; the oil circuit seal leakage status indicates a leak in the oil circuit between the oil bladder and the oil chamber, which may occur at the oil chamber pressure gauge or connecting pipe.

[0101] For example, when the change in bladder pressure is greater than 0.005 bar, the bladder pressure tends to increase; when the change in bladder pressure is less than or equal to 0.005 bar and greater than or equal to -0.005 bar, the bladder pressure tends to remain basically unchanged; and when the change in bladder pressure is less than -0.005 bar, the bladder pressure tends to decrease.

[0102] For example, after the detection pressure is injected, if any of the following occurs—leakage in the bladder body, leakage on the external inflation side of the bladder, or leakage in the inflation circuit of the bladder—the injected gas will cause the bladder to contract, resulting in a decrease in bladder pressure. Therefore, the mapping relationship between the bladder pressure change trend and the bladder sealing state includes: a basically constant bladder pressure corresponds to a well-sealed bladder; a decrease in bladder pressure corresponds to a leaking bladder. That is, when the bladder pressure change trend is a basically constant bladder pressure, the bladder sealing state is determined to be a leaking bladder; when the bladder pressure change trend is a decrease in bladder pressure, the bladder sealing state is determined to be a well-sealed bladder. Based on this, the bladder sealing state is taken as the bladder sealing result.

[0103] In this embodiment, the sealing status of the oil bladder is directly determined by the change in oil bladder pressure. The status determination is completed based on the preset pressure threshold and mapping relationship. The detection logic is simple and clear, which reduces the complexity of calculation and judgment. It is suitable for application scenarios of rapid on-site detection and is easy for on-site maintenance personnel to quickly master and apply.

[0104] In one embodiment, when the measured value change includes the oil cavity pressure change, the oil bladder of the target transformer is tested for sealing performance based on the measured value change to obtain the oil bladder sealing result. This includes: determining the oil cavity pressure change trend based on the oil cavity pressure change; determining the sealing state of the oil circuit between the oil cavity and the oil bladder based on the oil bladder sealing state and the oil cavity pressure change trend, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determining the oil bladder sealing result based on the oil circuit sealing state.

[0105] The sealing status of the oil circuit includes the oil circuit leakage status, the oil bladder inflation circuit leakage status, the overall oil bladder leakage status, and the overall oil bladder intact status. The overall oil bladder leakage status indicates leakage in the oil bladder body or the external inflation side. The overall oil bladder intact status indicates that the oil bladder body and the external inflation side are properly sealed. The overall oil bladder leakage status is one of the oil bladder body leakage status and the external inflation side leakage status. The overall oil bladder intact status is one of the intact sealing status and the oil temperature change status.

[0106] For example, when the change in oil chamber pressure is greater than 0.005 bar, the trend of oil chamber pressure change is an increase in oil chamber pressure; when the oil chamber pressure is less than or equal to 0.005 bar and greater than or equal to -0.005 bar, the trend of oil chamber pressure change is that the oil chamber pressure remains basically unchanged; when the change in oil chamber pressure is less than -0.005 bar, the trend of oil chamber pressure change is a decrease in oil chamber pressure.

[0107] For example, when the oil chamber pressure changes in a downward trend, the sealing state of the oil circuit is determined to be either the oil circuit sealing leakage state or the overall sealing leakage state of the oil bladder; when the oil chamber pressure changes in a basically constant trend, the sealing state of the oil circuit is confirmed to be either the overall sealing intact state of the oil bladder or the sealing leakage state of the inflation circuit.

[0108] For example, since the oil bladder and oil cavity are connected, if the oil bladder body or the external inflation side of the oil bladder is damaged, causing a change in the oil bladder pressure, the oil cavity pressure will also change accordingly; that is, when the oil bladder pressure decreases, the oil cavity pressure decreases as well. If the oil bladder pressure decreases while the oil cavity pressure remains essentially unchanged, it indicates that the oil bladder body and the external inflation side of the oil bladder are intact, and only the inflation circuit of the oil bladder leaks, while the oil circuit does not leak. If the oil bladder pressure remains essentially unchanged while the oil cavity pressure decreases, it indicates that the oil circuit leaks. Based on this, if the oil bladder is in a sealed and intact state, and the oil cavity pressure shows a decreasing trend, it is confirmed that the oil circuit is leaking; if the oil cavity pressure shows an essentially unchanged trend, it is confirmed that the oil circuit is in a sealed and intact state. If the oil bladder is in a leaking state, and the oil chamber pressure remains relatively constant, then the oil circuit is confirmed to be in a leaking state (the inflation circuit is leaking). If the oil chamber pressure decreases, then the oil circuit is confirmed to be in a leaking state (the entire oil bladder is leaking). Based on this, the sealing state of the oil circuit is taken as the sealing result of the oil bladder.

[0109] It should be understood that when the measured changes include changes in oil chamber pressure and other changes, the sealing result of the oil bladder can be determined based on the analysis results corresponding to the changes in oil chamber pressure (i.e., the sealing status of the oil circuit) and the analysis results corresponding to other changes.

[0110] For example, when the measured value change includes the oil cavity pressure change and the oil bladder pressure change, the oil bladder of the target transformer 102 is tested for sealing performance based on the measured value change to obtain the oil bladder sealing result. This includes: determining the oil cavity pressure change trend based on the oil cavity pressure change; determining the oil bladder pressure change trend based on the oil bladder pressure change; determining the oil bladder sealing state based on the oil bladder pressure change; determining the oil circuit sealing state based on the oil bladder sealing state and the oil cavity pressure change trend; and determining the oil bladder sealing result based on the oil circuit sealing state and the oil bladder sealing state.

[0111] In this embodiment, by combining parameters from two dimensions—the change in oil bladder pressure and the change in oil cavity pressure—a stratified determination of different leakage locations is achieved. This not only determines whether the oil bladder as a whole has leaked, but also further distinguishes whether the leak occurs in the oil circuit, the inflation circuit, or the oil bladder body and the external inflation side. This provides accurate location guidance for subsequent fault repair and significantly improves the reference value of the detection results.

[0112] In one embodiment, when the measured value change includes the piston displacement change, the sealing performance of the oil bladder of the target transformer is tested based on the measured value change to obtain the oil bladder sealing result. This includes: determining the piston displacement change trend based on the piston displacement change; determining the oil bladder body sealing state based on the oil bladder sealing state and the piston displacement change, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change; and determining the oil bladder sealing result based on the oil bladder body sealing state.

[0113] The sealing state of the oil bladder 104 can be one of the following: oil bladder body sealing leakage state, circuit sealing integrity state, oil temperature change state, and circuit sealing leakage state. The circuit sealing integrity state can be one of the following: sealing integrity state and oil circuit sealing leakage state. The circuit sealing leakage state can be one of the following: oil bladder external inflation side sealing leakage state and oil bladder inflation circuit sealing leakage state.

[0114] For example, the difference between the initial piston displacement measurement and the target piston displacement measurement is calculated, and the formula for calculating the piston displacement change is as follows:

[0115]

[0116] in, This represents the change in piston displacement. This is the initial piston displacement measurement value. The measured value of the target piston displacement.

[0117] For example, when the piston displacement change is greater than 0.5 mm, the piston displacement changes downward; when the piston displacement change is less than or equal to 0.5 mm and greater than or equal to -0.5 mm, the piston displacement changes basically unchanged; when the piston displacement change is less than -0.5 mm, the piston displacement changes upward.

[0118] For example, when the piston displacement change is basically constant, the body sealing state of the oil bladder 104 is determined to be either the loop seal leakage state or the loop seal intact state; when the piston displacement change is upward, the body sealing state of the oil bladder 104 is determined to be either the oil bladder body seal leakage state or the oil temperature change state.

[0119] For example, when the sealing status of the oil bladder 104 indicates an oil bladder seal leakage state, if the piston displacement change is basically constant, the body sealing status of the oil bladder 104 is determined to be a circuit seal leakage state; if the piston displacement change is upward, the body sealing status of the oil bladder 104 is determined to be an oil temperature change state. When the sealing status of the oil bladder 104 indicates an oil bladder seal integrity state, if the piston displacement change is basically constant, the body sealing status of the oil bladder 104 is determined to be a circuit seal integrity state; if the piston displacement change is upward, the body sealing status of the oil bladder 104 is determined to be an oil temperature change state.

[0120] For example, when the measured value change includes the change in oil cavity pressure and the change in piston displacement, the sealing performance of the oil bladder 104 of the target transformer 102 is tested based on the measured value change to obtain the sealing result of the oil bladder 104, including: determining the piston displacement change trend based on the piston displacement change; determining the oil cavity pressure change trend based on the oil cavity pressure change; when the piston displacement change is basically unchanged and the oil cavity pressure change trend is basically unchanged, determining the oil bladder sealing result as either a well-sealed state or a leaking state in the oil bladder inflation circuit; when the piston displacement change is basically unchanged and the oil cavity pressure change trend is a decrease in oil cavity pressure, determining the oil bladder sealing result as either a leaking state in the external inflation side of the oil bladder or a leaking state in the oil circuit; when the piston displacement change is upward and the oil cavity pressure change trend is a decrease in oil cavity pressure, determining the oil bladder sealing result as a leaking state in the oil bladder body; and when the piston displacement change is upward and the oil cavity pressure change trend is basically unchanged, determining the oil bladder sealing result as a leaking state in the oil circuit.

[0121] For example, when the measured changes include changes in oil bladder pressure and piston displacement, the sealing performance of the oil bladder 104 of the target transformer 102 is tested based on the measured changes to obtain the sealing result of the oil bladder 104. This includes: determining the piston displacement change trend based on the piston displacement change; determining the oil bladder pressure change trend based on the oil bladder pressure change; obtaining the sealing state of the oil bladder 104 of the target transformer 102 through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state based on the oil bladder pressure change; determining the body sealing state of the oil bladder 104 based on the sealing state of the oil bladder 104 of the target transformer 102 and the piston displacement change trend; and determining the oil bladder sealing result based on the body sealing state of the oil bladder 104.

[0122] For example, when the measured changes include piston displacement change, oil cavity pressure change, and oil bladder pressure change, the oil bladder 104 of the target transformer 102 is tested for sealing performance based on the measured changes to obtain the oil bladder sealing result. This includes: determining the piston displacement change trend based on the piston displacement change; determining the oil cavity pressure change trend based on the oil cavity pressure change; determining the oil bladder pressure change trend based on the oil bladder pressure change; obtaining the sealing state of the oil bladder 104 of the target transformer 102 through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state based on the oil bladder pressure change; determining the sealing state of the body of the oil bladder 104 based on the sealing state of the oil bladder 104 of the target transformer 102 and the piston displacement change trend; determining the sealing state of the oil circuit based on the sealing state of the oil bladder 104 of the target transformer 102 and the oil cavity pressure change trend; and determining the oil bladder sealing result based on the sealing state of the oil bladder 104, the sealing state of the body of the oil bladder 104, and the sealing state of the oil circuit.

[0123] In other words, when the measured changes include multiple factors such as changes in oil bladder pressure, changes in oil chamber pressure, and changes in piston displacement, the oil bladder sealing result can be determined comprehensively based on the analysis results corresponding to each of the measured changes.

[0124] Furthermore, as shown in Table 1, when the trends of piston displacement, oil chamber pressure, and oil bladder pressure remain basically unchanged, the oil bladder sealing result is determined to be in a good sealing state. When the oil bladder pressure changes upward and the oil chamber pressure and piston displacement both show a pressure decrease, the gas in oil bladder 104 is lost, causing oil bladder 104 to contract. The oil circuit volume requirement of the target transformer 102 decreases, and the pressure in the oil chamber also decreases accordingly. At this time, the piston moves upward, and the pressure in oil bladder 104 decreases. The oil bladder sealing result is a leak in the oil bladder body. When the piston displacement trend remains basically unchanged, and both the oil chamber pressure and oil bladder pressure trends are decreasing, it indicates that the leak point is on the external inflation side of oil bladder 104, with the volume of oil bladder 104 remaining constant. In this case, the piston moves upwards, and the pressure in oil bladder 104 decreases, resulting in a leak on the external inflation side of the oil bladder. When both the piston displacement and oil chamber pressure trends remain basically unchanged, but the oil bladder pressure trend is decreasing, only the oil bladder inflation circuit leaks; the oil bladder 104 body remains intact, and the oil circuit pressure is unaffected. In this case, the oil bladder sealing result is a leak in the inflation circuit. In the case where the piston displacement trend is upward and the oil chamber pressure and oil bladder pressure trends are basically unchanged, the piston displacement may be caused by oil temperature changes. In this case, the oil bladder seal result is an oil temperature change state, which may be caused by temperature drift or sensor failure, and needs to be checked and calibrated. In the case where the piston displacement and oil bladder pressure trends are basically unchanged, and the oil chamber pressure trend is a pressure drop, it indicates that the leakage occurs in the oil chamber pressure gauge and its connecting pipeline. Oil bladder 104 is intact, and the oil bladder seal result is an oil circuit seal leakage state. The leakage may occur at the oil chamber pressure gauge or connecting pipeline.

[0125] In this embodiment, the piston displacement change is introduced as a third judgment dimension. Combined with the oil bladder pressure and oil chamber pressure, a multi-parameter joint judgment is completed. This not only accurately distinguishes leakage faults in different locations, but also identifies non-leakage anomalies such as oil temperature changes and sensor drift. This further improves the accuracy and fault tolerance of sealing detection, avoids detection misjudgments caused by changes in ambient temperature or equipment hardware deviations, and further enhances the reliability of the detection results.

[0126] In one embodiment, the method further includes: when the oil bladder sealing result indicates that the oil bladder is in a body seal leakage state, calculating the volume shrinkage caused by the oil bladder leakage based on the piston displacement change and the piston cross-sectional area.

[0127] Optionally, if the oil bladder sealing result indicates that the oil bladder is in a state of leakage, the oil pressure change can be converted into piston displacement. The amount of piston displacement change and the amount of volume shrinkage caused by oil bladder leakage are linearly related, as shown in the following linear relationship:

[0128]

[0129] in, This represents the change in piston displacement. Let be the cross-sectional area of ​​the piston. This represents the volume shrinkage caused by oil bladder leakage.

[0130] For example, if ,but Can cause The displacement of the piston is easy to measure.

[0131] Optionally, the volume shrinkage caused by oil bladder leakage can be used to calculate the leakage rate of the oil bladder leakage.

[0132] In this embodiment, the volume change caused by oil bladder leakage is directly converted into a precisely measurable piston displacement. The specific leakage amount can be calculated using the change in piston displacement, realizing the quantitative detection of minute leaks and further improving the accuracy of detection. This provides a more accurate reference for the maintenance and repair of the target transformer.

[0133] Table 1

[0134]

[0135] In one of the most specific embodiments, such as Figure 6 As shown, a method for testing the sealing performance of a transformer oil bladder according to this application includes the following steps:

[0136] Step 1: Connect the target transformer 102 and the dual-chamber piston cylinder, and pre-charge with gas.

[0137] The dual-chamber piston cylinder 204 is connected to the target transformer 102. The dual-chamber piston cylinder 204 includes an oil chamber 302, a gas chamber 304, and a piston 306. The oil chamber 302 is located above the gas chamber 304, and the piston 306 is placed between the gas chamber 304 and the oil chamber 302. The gas chamber 304 is connected to the gas supply device 402 for storing gas, and the oil chamber 302 is connected to the oil bladder 104 of the target transformer 102 for storing transformer oil.

[0138] In response to the piston initial position control command, gas is injected into the gas chamber 304 through the gas inlet 314 via the gas supply device 402 until the pressure collected by the pressure sensor on the gas chamber 304 reaches the preset pressure. The gas can be nitrogen or dry air.

[0139] Step 2: Inject oil into the oil chamber of the dual-chamber piston cylinder and perform a thorough venting process.

[0140] While the gas supply device 402 injects gas into the gas chamber 304 through the gas inlet 314, the transformer oil is injected into the oil chamber 302 under static pressure by controlling the opening of the oil inlet 312. The oil fills from bottom to top, driving the air in the oil chamber 302 upward to the umbrella-shaped gas collecting hood. The air is gathered by the conical surface of the umbrella-shaped hood to the top exhaust valve 308. The exhaust valve 308 is opened until a continuous flow of pure oil overflows, i.e., when there are no air bubbles, the exhaust valve 308 is immediately closed.

[0141] Step 3: Maintain gas balance in the system and record the initial piston displacement measurement.

[0142] The distance measuring device 310, which is set on the side of the dual-chamber piston cylinder 204, is collected in real time. The gas supply device 402 is controlled to control the piston 306 to be in the initial position by finely adjusting the nitrogen pressure in the gas chamber 304, and the initial piston displacement measurement value is obtained at this time.

[0143] Step 4: Fill the oil bladder with the test pressure and record the displacement change of the piston.

[0144] After injecting detection pressure into the oil bladder 104 of the target transformer 102, during the pressure holding phase, the piston displacement, oil cavity pressure, and oil bladder pressure are monitored simultaneously. Based on the piston displacement, oil cavity pressure, and oil bladder pressure during the pressure holding phase, the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer 102 is stable, the target oil cavity pressure measurement value when the oil cavity pressure is stable, and the target piston displacement measurement value when the position of piston 316 is stable are determined.

[0145] Step 5: Perform pressure monitoring and leak detection.

[0146] Based on the difference between the initial and target measured values, the change in measured values ​​is determined. The change in measured values ​​includes at least one of the changes in oil bladder pressure, oil cavity pressure, and piston displacement. Based on the change in measured values, the oil bladder of the target transformer 102 is tested for sealing performance to obtain the oil bladder sealing result.

[0147] When the measured changes include changes in bladder pressure, oil chamber pressure, and piston displacement, the trends of bladder pressure change, oil chamber pressure change, and piston displacement change are determined based on the changes in bladder pressure, oil chamber pressure change, and piston displacement change. Based on these trends, if all three trends remain essentially unchanged, the bladder seal is considered intact. However, if the bladder pressure changes upwards, and both the oil chamber pressure and piston displacement decrease, gas loss occurs, causing the bladder to contract. This reduces the oil circuit volume requirement of the target transformer 102, and the oil chamber pressure also decreases. In this case, the piston moves upwards, and the bladder pressure decreases, resulting in a leak in the bladder body seal. When the piston displacement trend remains basically constant, and both the oil chamber pressure and oil bladder pressure trends are decreasing, it indicates that the leak point is on the external inflation side of the oil bladder, with the oil bladder volume remaining constant. In this case, the piston moves upwards, and the oil bladder pressure decreases, resulting in a leak on the external inflation side of the oil bladder. When both the piston displacement and oil chamber pressure trends remain basically constant, and the oil bladder pressure trend is decreasing, only the oil bladder inflation circuit leaks, the oil bladder body remains intact, and the oil circuit pressure is unaffected. In this case, the oil bladder inflation circuit also leaks. If the displacement trend is upward and the oil chamber pressure and oil bladder pressure trends are basically unchanged, the piston displacement may be caused by oil temperature changes. In this case, the oil bladder seal result indicates an oil temperature change, which may be caused by temperature drift or sensor failure, requiring inspection and calibration. If the piston displacement and oil bladder pressure trends are basically unchanged, but the oil chamber pressure trend is a pressure drop, it indicates that the leak is occurring in the oil chamber pressure gauge and its connecting pipes, while the oil bladder is intact. The oil bladder seal result indicates an oil circuit loop seal leak, and the leak may occur at the oil chamber pressure gauge or connecting pipes.

[0148] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0149] Based on the same inventive concept, this application also provides a transformer oil bladder sealing test device for implementing the above-mentioned transformer oil bladder sealing test method. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations of one or more transformer oil bladder sealing test device embodiments provided below can be found in the limitations of the transformer oil bladder sealing test method described above, and will not be repeated here.

[0150] In one exemplary embodiment, such as Figure 7 As shown, a transformer oil bladder sealing performance testing device 700 is provided, applied to a dual-chamber piston cylinder. The dual-chamber piston cylinder is connected to the target transformer. The dual-chamber piston cylinder includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is located between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil bladder of the target transformer for storing transformer oil. The device includes: a control module 702, an acquisition module 704, a determination module 706, and a detection module 708, wherein:

[0151] Control module 702 is used to control the piston to the initial position through the gas supply device and to acquire the initial measurement value when the piston is in the initial position. The initial measurement value includes at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0152] The acquisition module 704 is used to acquire target measurement values ​​after injecting detection pressure into the oil bladder of the target transformer. The target measurement values ​​include at least one of the target oil bladder pressure measurement value, the target oil cavity pressure measurement value, and the target piston displacement measurement value.

[0153] The determination module 706 is used to determine the change in measurement value based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the changes in oil bladder pressure, oil chamber pressure, and piston displacement.

[0154] The detection module 708 is used to perform a sealing test on the oil bladder of the target transformer based on the change in the measured value, and obtain the sealing result of the oil bladder.

[0155] In one embodiment, the control module 702 is further configured to acquire the piston position obtained by the distance measuring device, and, if the position is not at the initial position, control the piston to be at the initial position by the gas supply device, acquire the initial piston displacement measurement value obtained by the distance measuring device, wherein the distance measuring device is located on the side of the dual-chamber piston cylinder; and acquire the initial oil bladder pressure measurement value and the initial oil chamber pressure measurement value obtained by the pressure measuring device.

[0156] In one embodiment, the acquisition module 704 is further configured to, after injecting detection pressure into the oil bladder of the target transformer, determine the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer is stable, determine the target oil cavity pressure measurement value when the oil cavity pressure of the oil cavity is stable, and determine the target piston displacement measurement value when the piston position is stable.

[0157] In one embodiment, the detection module 708 is further configured to determine the oil bladder pressure change trend based on the oil bladder pressure change amount; based on the oil bladder pressure change trend, obtain the oil bladder sealing state of the target transformer through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state; and based on the oil bladder sealing state, determine the oil bladder sealing result.

[0158] In one embodiment, the detection module 708 is further configured to: determine the oil chamber pressure change trend based on the oil chamber pressure change amount; determine the sealing state of the oil circuit between the oil chamber and the oil bladder based on the sealing state of the oil bladder and the oil chamber pressure change trend, wherein the sealing state of the oil bladder is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determine the oil bladder sealing result based on the sealing state of the oil circuit.

[0159] In one embodiment, the detection module 708 is further configured to determine the piston displacement change trend based on the piston displacement change amount; determine the oil bladder body sealing state based on the oil bladder sealing state and the piston displacement change amount, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determine the oil bladder sealing result based on the oil bladder body sealing state.

[0160] In one embodiment, the transformer oil bladder sealing detection device 700 further includes a calculation module, which is used to calculate the volume shrinkage caused by oil bladder leakage based on the piston displacement change and the cross-sectional area of ​​the piston when the oil bladder sealing result indicates that the oil bladder is in a state of body sealing leakage.

[0161] Each module in the aforementioned transformer oil bladder sealing test device 700 can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the corresponding operations of each module.

[0162] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 8 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores piston position data and pressure data of the oil bladder and oil chamber. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a method for detecting the sealing performance of a transformer oil bladder.

[0163] Those skilled in the art will understand that Figure 8 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0164] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0165] Using a gas supply device, the piston is controlled to be in an initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0166] After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of the target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value.

[0167] The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement.

[0168] Based on the change in measured values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing results are obtained.

[0169] In one embodiment, when the processor executes the computer program, it further performs the following steps: acquiring the position of the piston obtained by a distance measuring device; if the position is not at the initial position, controlling the piston to be at the initial position by a gas supply device; acquiring the initial piston displacement measurement value obtained by the distance measuring device, wherein the distance measuring device is located on the side of the dual-chamber piston cylinder; and acquiring the initial oil bladder pressure measurement value and the initial oil chamber pressure measurement value obtained by a pressure measuring device.

[0170] In one embodiment, when the processor executes the computer program, it further performs the following steps: after injecting the detection pressure into the oil bladder of the target transformer, determining the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer is stable, determining the target oil cavity pressure measurement value when the oil cavity pressure is stable, and determining the target piston displacement measurement value when the piston position is stable.

[0171] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining the oil bladder pressure change trend based on the oil bladder pressure change amount; obtaining the oil bladder sealing state of the target transformer based on the oil bladder pressure change trend and the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state; and determining the oil bladder sealing result based on the oil bladder sealing state.

[0172] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining the oil chamber pressure change trend based on the oil chamber pressure change amount; determining the sealing state of the oil circuit between the oil chamber and the oil bladder based on the sealing state of the oil bladder and the oil chamber pressure change trend, wherein the sealing state of the oil bladder is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determining the oil bladder sealing result based on the sealing state of the oil circuit.

[0173] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining the piston displacement change trend based on the piston displacement change amount; determining the oil bladder body sealing state based on the oil bladder sealing state and the piston displacement change amount, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determining the oil bladder sealing result based on the oil bladder body sealing state.

[0174] In one embodiment, when the processor executes the computer program, it further performs the following steps: if the oil bladder sealing result indicates that the oil bladder is in a body seal leakage state, calculate the volume shrinkage caused by the oil bladder leakage based on the piston displacement change and the piston cross-sectional area.

[0175] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0176] Using a gas supply device, the piston is controlled to be in an initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0177] After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of the target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value.

[0178] The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement.

[0179] Based on the change in measured values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing results are obtained.

[0180] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: acquiring the position of the piston obtained by a distance measuring device; if the position is not at the initial position, controlling the piston to be at the initial position by a gas supply device; acquiring the initial piston displacement measurement value obtained by the distance measuring device, wherein the distance measuring device is located on the side of the dual-chamber piston cylinder; and acquiring the initial oil bladder pressure measurement value and the initial oil chamber pressure measurement value obtained by a pressure measuring device.

[0181] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: after injecting the detection pressure into the oil bladder of the target transformer, determining the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer is stable, determining the target oil cavity pressure measurement value when the oil cavity pressure of the oil cavity is stable, and determining the target piston displacement measurement value when the piston position is stable.

[0182] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the oil bladder pressure change trend based on the oil bladder pressure change amount; obtaining the oil bladder sealing state of the target transformer based on the oil bladder pressure change trend and the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state; and determining the oil bladder sealing result based on the oil bladder sealing state.

[0183] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the oil chamber pressure change trend based on the oil chamber pressure change amount; determining the sealing state of the oil circuit between the oil chamber and the oil bladder based on the sealing state of the oil bladder and the oil chamber pressure change trend, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determining the oil bladder sealing result based on the oil circuit sealing state.

[0184] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the piston displacement change trend based on the piston displacement change amount; determining the oil bladder body sealing state based on the oil bladder sealing state and the piston displacement change amount, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determining the oil bladder sealing result based on the oil bladder body sealing state.

[0185] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: if the oil bladder sealing result indicates that the oil bladder is in a body seal leakage state, calculate the volume shrinkage caused by the oil bladder leakage based on the piston displacement change and the piston cross-sectional area.

[0186] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0187] Using a gas supply device, the piston is controlled to be in an initial position, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value.

[0188] After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of the target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value.

[0189] The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement.

[0190] Based on the change in measured values, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing results are obtained.

[0191] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: acquiring the position of the piston obtained by a distance measuring device; if the position is not at the initial position, controlling the piston to be at the initial position by a gas supply device; acquiring the initial piston displacement measurement value obtained by the distance measuring device, wherein the distance measuring device is located on the side of the dual-chamber piston cylinder; and acquiring the initial oil bladder pressure measurement value and the initial oil chamber pressure measurement value obtained by a pressure measuring device.

[0192] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: after injecting the detection pressure into the oil bladder of the target transformer, determining the target oil bladder pressure measurement value when the oil bladder pressure of the target transformer is stable, determining the target oil cavity pressure measurement value when the oil cavity pressure of the oil cavity is stable, and determining the target piston displacement measurement value when the piston position is stable.

[0193] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the oil bladder pressure change trend based on the oil bladder pressure change amount; obtaining the oil bladder sealing state of the target transformer based on the oil bladder pressure change trend and the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state; and determining the oil bladder sealing result based on the oil bladder sealing state.

[0194] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the oil chamber pressure change trend based on the oil chamber pressure change amount; determining the sealing state of the oil circuit between the oil chamber and the oil bladder based on the sealing state of the oil bladder and the oil chamber pressure change trend, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determining the oil bladder sealing result based on the oil circuit sealing state.

[0195] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining the piston displacement change trend based on the piston displacement change amount; determining the oil bladder body sealing state based on the oil bladder sealing state and the piston displacement change amount, wherein the oil bladder sealing state is obtained based on the oil bladder pressure change trend through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state, and the oil bladder pressure change trend is determined based on the oil bladder pressure change amount; and determining the oil bladder sealing result based on the oil bladder body sealing state.

[0196] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: if the oil bladder sealing result indicates that the oil bladder is in a body seal leakage state, calculate the volume shrinkage caused by the oil bladder leakage based on the piston displacement change and the piston cross-sectional area.

[0197] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0198] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0199] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0200] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for detecting the sealing performance of a transformer oil bladder, characterized in that, An application is made to a dual-chamber piston cylinder, the dual-chamber piston cylinder being connected to a target transformer. The dual-chamber piston cylinder includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is located between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil sump of the target transformer for storing transformer oil. The method includes: The piston is controlled to be in an initial position using the gas supply device, and initial measurement values ​​are obtained when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value. After injecting detection pressure into the oil bladder of the target transformer, target measurement values ​​are obtained, including at least one of target oil bladder pressure measurement value, target oil cavity pressure measurement value, and target piston displacement measurement value; The change in measurement value is determined based on the difference between the initial measurement value and the target measurement value. The change in measurement value includes at least one of the following: change in oil bladder pressure, change in oil chamber pressure, and change in piston displacement. Based on the change in the measured value, the oil bladder of the target transformer is tested for sealing performance, and the oil bladder sealing result is obtained.

2. The method according to claim 1, characterized in that, The step of controlling the piston to an initial position via the gas supply device and obtaining initial measurement values ​​when the piston is in the initial position includes: The position of the piston is acquired by a distance measuring device. If the position is not in the initial position, the piston is controlled to be in the initial position by the gas supply device. The initial piston displacement measurement value is acquired by the distance measuring device, wherein the distance measuring device is located on the side of the dual-chamber piston cylinder. Acquire the initial oil bladder pressure measurement value and the initial oil chamber pressure measurement value collected by the pressure measurement device.

3. The method according to claim 1, characterized in that, The step of obtaining the target measurement value after injecting the detection pressure into the oil bladder of the target transformer includes: After injecting detection pressure into the oil bladder of the target transformer, the target oil bladder pressure measurement value is determined when the oil bladder pressure of the target transformer is stable, the target oil cavity pressure measurement value is determined when the oil cavity pressure of the oil cavity is stable, and the target piston displacement measurement value is determined when the piston position is stable.

4. The method according to claim 1, characterized in that, When the measured value change includes the oil bladder pressure change, the step of performing a sealing test on the oil bladder of the target transformer based on the measured value change to obtain the oil bladder sealing result includes: Based on the change in oil bladder pressure, determine the trend of oil bladder pressure change; Based on the oil bladder pressure change trend, the sealing state of the oil bladder of the target transformer is obtained through the mapping relationship between the oil bladder pressure change trend and the oil bladder sealing state. Based on the sealing status of the oil bladder, the sealing result of the oil bladder is determined.

5. The method according to claim 1, characterized in that, When the measured value change includes the oil chamber pressure change, the step of performing a sealing test on the oil bladder of the target transformer based on the measured value change to obtain the oil bladder sealing result includes: The trend of oil chamber pressure change is determined based on the amount of change in oil chamber pressure. Based on the sealing state of the oil bladder and the pressure change trend of the oil cavity, the sealing state of the oil circuit between the oil cavity and the oil bladder is determined. The sealing state of the oil bladder is obtained by mapping the pressure change trend of the oil bladder to the sealing state of the oil bladder. The pressure change trend of the oil bladder is determined based on the amount of pressure change of the oil bladder. The sealing result of the oil bladder is determined based on the sealing status of the oil circuit.

6. The method according to claim 1, characterized in that, When the measured value change includes the piston displacement change, the step of performing a sealing test on the oil bladder of the target transformer based on the measured value change to obtain the oil bladder sealing result includes: Based on the piston displacement change, determine the piston displacement change trend; Based on the sealing state of the oil bladder and the change in piston displacement, the sealing state of the oil bladder body is determined. The sealing state of the oil bladder is obtained by mapping the oil bladder pressure change trend to the oil bladder sealing state. The oil bladder pressure change trend is determined based on the change in oil bladder pressure. The sealing result of the oil bladder is determined based on the sealing state of the oil bladder body.

7. The method according to claim 1, characterized in that, The method further includes: If the oil bladder sealing result indicates that the oil bladder is in a leaking state, the volume shrinkage caused by the oil bladder leakage is calculated based on the piston displacement change and the piston cross-sectional area.

8. A transformer oil bladder sealing performance testing device, characterized in that, An apparatus is applied to a dual-chamber piston cylinder, which is connected to a target transformer. The dual-chamber piston cylinder includes an oil chamber, a gas chamber, and a piston. The oil chamber is located above the gas chamber, and the piston is located between the gas chamber and the oil chamber. The gas chamber is connected to a gas supply device for storing gas, and the oil chamber is connected to the oil sump of the target transformer for storing transformer oil. The device includes: The control module is used to control the piston to an initial position via the gas supply device, and to acquire initial measurement values ​​when the piston is in the initial position. The initial measurement values ​​include at least one of the initial oil bladder pressure measurement value, the initial oil chamber pressure measurement value, and the initial piston displacement measurement value. The acquisition module is used to acquire target measurement values ​​after injecting detection pressure into the oil bladder of the target transformer. The target measurement values ​​include at least one of the target oil bladder pressure measurement value, the target oil cavity pressure measurement value, and the target piston displacement measurement value. The determination module is used to determine the change in measurement value based on the difference between the initial measurement value and the target measurement value, wherein the change in measurement value includes at least one of the changes in oil bladder pressure, changes in oil chamber pressure, and changes in piston displacement; The detection module is used to perform a sealing test on the oil bladder of the target transformer based on the change in the measured value, and obtain the sealing result of the oil bladder.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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