Method and device for testing deformation springback capability of wave fin

Abstract

The invention provides a method and a device for testing the deformation springback capability of a wave fin, and the method comprises the steps: configuring a hydraulic pump station which comprises a servo drive, a direct charge and a pressure cylinder, and simulating the thermal expansion and cold contraction of oil in a fully-sealed distribution transformer. The servo pump drives the pressurizing cylinder to repeatedly pressurize and release pressure, and pressure, temperature and wave wing deformation springback data are monitored. And the data are used for evaluating the deformation springback capability of the wave wing, so that the safety state of the transformer is judged. The method is close to actual working conditions, multi-dimensional data evaluation is more objective and accurate, and the method is superior to traditional experience judgment.

Description

Technical Field

[0001] The present application belongs to the field of transformer testing, and in particular, relates to a method and device for testing the deformation and resilience of wave wings. Background Art

[0002] In the power system, the fully sealed distribution transformer is one of the key power equipment, and its internal structure and performance directly affect the stability and safety of the power grid. The transformer is usually filled with insulating oil, which will expand and contract due to temperature changes during the operation of the transformer. In particular, the corrugated fins (or corrugated oil tanks) inside the transformer are important components for regulating oil volume changes. Their deformation and resilience are crucial to maintaining the internal pressure balance of the transformer, preventing oil leakage, and ensuring insulation performance.

[0003] However, traditional transformer wave fin deformation and resilience testing methods often rely on empirical judgment or simple physical tests, which are difficult to accurately simulate the complex operating conditions of the transformer in actual operation, such as the thermal expansion and contraction effect caused by oil temperature changes. The limitations of this test method may lead to inaccurate evaluation of wave fin performance, which in turn affects the effective judgment of the overall safe operating status of the transformer. Summary of the invention

[0004] The purpose of the present application is to overcome the defects in the above-mentioned prior art and to provide a method and device for reducing the contact resistance of the guide bar of the GIS busbar bellows.

[0005] A method for testing the deformation and rebound ability of a wave wing, comprising:

[0006] A hydraulic pump station is configured, the hydraulic pump station comprising a servo drive, a direct charging unit and a booster cylinder; the servo drive is used to drive the booster cylinder to increase pressure; the direct charging unit is used to fill a preset amount of oil into the booster cylinder; the booster cylinder is connected to a fully sealed distribution transformer through a pipeline;

[0007] The servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate the thermal expansion and contraction of the oil in the fully sealed distribution transformer;

[0008] Acquire pressure, temperature, deformation and rebound data of corrugated fins during the thermal expansion and contraction process of the oil in the fully sealed distribution transformer;

[0009] Determining the deformation and rebound capability of the wave fin according to the pressure, temperature, deformation and rebound data of the wave fin;

[0010] The safe operating status of the fully sealed distribution transformer is evaluated based on the resilience.

[0011] Optionally, the servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate thermal expansion and contraction of the oil in the fully sealed distribution transformer, including:

[0012] Using the direct charging unit to add a preset amount of oil into the stamping cavity of the booster cylinder to reach a predetermined oil level;

[0013] The boost cylinder is driven by the servo driver to perform boosting;

[0014] Monitor and record the oil level, pressure and temperature data of the fully sealed distribution transformer;

[0015] Obtain the deformation of the wave wing;

[0016] The servo driver drives the boost cylinder to gradually reduce the oil pressure to obtain the rebound condition of the wave wing, and judges whether it can restore to a normal state according to the rebound condition. If it restores to a normal state, it is judged to be a safe operating state; if it does not restore to a normal state, it is judged to be an unsafe operating state.

[0017] Optionally, the booster cylinder is manufactured using 45# steel, and the piston and piston rod are made of 42CrMo.

[0018] Optionally, a stroke boosting time of the boosting cylinder is greater than or equal to 1 s.

[0019] Optionally, before the servo driver drives the boost cylinder to repeatedly boost and release pressure, the method further includes:

[0020] Before the boost cylinder starts to work, if the initial position state of the boost cylinder does not meet the initial setting requirements, the initial state of the boost cylinder is adjusted.

[0021] The present application also provides a testing device for the deformation and rebound ability of a wave fin, comprising: a hydraulic pump station and a processing module;

[0022] The hydraulic pump station includes a servo drive, a direct charging unit and a booster cylinder;

[0023] The servo drive includes an integrated oil tank and a servo hydraulic oil pump for driving the boost cylinder to increase pressure;

[0024] The direct charging unit fills the boost cylinder with a preset amount of oil stored in the integrated tank;

[0025] The boost cylinder is connected to a fully sealed distribution transformer via a pipeline;

[0026] The servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate the thermal expansion and contraction of the oil in the fully sealed distribution transformer;

[0027] The processing module obtains pressure, temperature, deformation and rebound data of the wave wing in a process simulating thermal expansion and contraction of the oil in the fully sealed distribution transformer; determines the deformation and rebound capacity of the wave wing based on the pressure, temperature, deformation and rebound data of the wave wing; and evaluates the safe operation status of the fully sealed distribution transformer based on the rebound capacity.

[0028] Optionally, the servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate thermal expansion and contraction of the oil in the fully sealed distribution transformer, including:

[0029] Using the direct charging unit to add a preset amount of oil into the stamping cavity of the booster cylinder to reach a predetermined oil level;

[0030] The boost cylinder is driven by the servo driver to perform boosting;

[0031] Monitor and record the oil level, pressure and temperature data of the fully sealed distribution transformer;

[0032] Obtain the deformation of the wave wing;

[0033] The servo driver drives the boost cylinder to gradually reduce the oil pressure to obtain the rebound condition of the wave wing, and judges whether it can restore to a normal state according to the rebound condition. If it restores to a normal state, it is judged to be a safe operating state; if it does not restore to a normal state, it is judged to be an unsafe operating state.

[0034] Optionally, the booster cylinder is manufactured using 45# steel, and the piston and piston rod are made of 42CrMo.

[0035] Optionally, a stroke boosting time of the boosting cylinder is greater than or equal to 1 s.

[0036] Optionally, the servo driver drives the booster cylinder to repeatedly increase pressure and release pressure, comprising:

[0037] Before the boost cylinder starts to work, if the initial position state of the boost cylinder does not meet the initial setting requirements, the initial state of the boost cylinder is adjusted.

[0038] The beneficial effects of this application are:

[0039] The present application provides a test method for the deformation and rebound ability of a wave wing, comprising: configuring a hydraulic pump station, the hydraulic pump station comprising a servo drive, a direct charging unit and a booster cylinder; the servo drive is used to drive the booster cylinder to increase pressure; the direct charging unit is used to fill the booster cylinder with a preset amount of oil; the booster cylinder is connected to a fully sealed distribution transformer through a pipeline; the servo drive drives the booster cylinder to repeatedly increase pressure and release pressure on the oil to simulate the thermal expansion and contraction of the oil in the fully sealed distribution transformer; obtaining the pressure, temperature, deformation and rebound data of the wave wing during the thermal expansion and contraction of the oil in the fully sealed distribution transformer; determining the deformation and rebound ability of the wave wing according to the pressure, temperature, deformation and rebound data of the wave wing; and evaluating the safe operation state of the fully sealed distribution transformer according to the rebound ability. The present application provides an environment close to the actual working conditions for the deformation and rebound test of the wave wing by simulating the thermal expansion and contraction phenomenon of the oil inside the transformer due to temperature changes. While monitoring basic parameters such as pressure and temperature, special attention is also paid to the deformation and rebound data of the wave wing. The deformation and rebound ability of the wave wing is determined based on the obtained multi-dimensional data such as pressure, temperature, wave wing deformation and rebound, which is more objective and accurate than traditional empirical judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the test process of the deformation and rebound ability of the wave wing in this application;

[0041] Figure 2 This is a schematic diagram of the hydraulic pump station in this application. DETAILED DESCRIPTION

[0042] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that various forms of implementing the present disclosure should not be limited by the embodiments set forth herein. On the contrary, the embodiments are provided to more thoroughly understand the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] Please refer to Figure 1 As shown, a method for testing the deformation and rebound ability of a wave wing comprises the following steps:

[0044] S101. Configure a hydraulic pump station, which includes a servo drive, a direct charging unit and a booster cylinder; the servo drive is used to drive the booster cylinder to increase pressure; the direct charging unit is used to fill a preset amount of oil into the booster cylinder.

[0045] Please refer to Figure 2As shown, in the hydraulic pump station, the direct charging unit includes: an integrated oil tank 101, which is used to store or temporarily store the oil, which is used as transformer insulating oil. An oil pump / valve group 102, which includes a pump, a valve and other control components, which work together to transport or regulate the oil in the integrated oil tank. The pump is responsible for providing power to extract the oil from the oil tank and transport it to subsequent equipment, while the valve is used to control the flow and direction of the medium.

[0046] The hydraulic pump station also includes: a PT (pressure transmitter 107) for real-time monitoring and displaying the pressure level of a certain point in the system to ensure that the system operates within a safe and stable pressure range.

[0047] The hydraulic pump station also includes: an electromagnetic exhaust valve 106, which is used to control the discharge of gas or liquid in the system, ensure the stability of the internal pressure of the system, and prevent equipment damage caused by overpressure.

[0048] The hydraulic pump station also includes: a temperature transmitter 108 for monitoring and converting the temperature signal in the system into a measurable electrical signal, so as to monitor the temperature change of the system in real time and prevent malfunctions or accidents caused by overheating.

[0049] The hydraulic pump station further includes a booster cylinder 105 and a valve block 110. The booster cylinder 105 is used to boost the oil to meet specific process requirements, while the valve block 110 integrates multiple valves and control elements to achieve oil flow control.

[0050] In the hydraulic pump station, the servo driver includes: an oil pump / valve group 104 drives the hydraulic oil in the driving oil tank 103 to drive the booster cylinder 105 to work.

[0051] The direct charging unit starts the direct charging oil pump when needed, and accurately injects the oil into the stamping cavity of the booster cylinder 105 through the electromagnetic direct charging valve. During the process, the electromagnetic overflow valve and the measuring instrument work together to ensure the stability and safety of the filling process.

[0052] S102, the boost cylinder is connected to a fully sealed distribution transformer through a pipeline.

[0053] The main function of the booster cylinder 105 is to provide power or pressure through the conversion of hydraulic energy. In the present application, the booster cylinder 105 is physically connected to the fully sealed distribution transformer 109 through a pipeline of a specific specification, namely a DN20 pipeline.

[0054] DN20 pipe is a standardized pipe size with an inner diameter of approximately 20 mm. The selection of this size is usually based on factors such as the required flow, pressure, and installation space.

[0055] A multifunctional module is provided at the entrance of the distribution transformer 109. The module integrates a variety of sensors and valves to monitor the operating status of the distribution transformer 109 in real time and perform necessary control. Specifically, the module includes the following key components:

[0056] Pressure transmitter 107: This sensor is used to measure the pressure value inside the distribution transformer 109 or in the pipeline connected to it. By monitoring the pressure changes in real time, potential problems caused by abnormal pressure, such as leakage, blockage, etc., can be discovered and prevented in time.

[0057] Temperature transmitter 108: Temperature is one of the important factors that affect the performance and life of electrical equipment. The temperature transmitter 108 can accurately measure the temperature of the distribution transformer 109 and convert this information into a processable electrical signal output. By monitoring the temperature, it can ensure that the distribution transformer 109 operates within a safe temperature range to avoid failure or damage caused by overheating.

[0058] Exhaust valve: Exhaust is a very important link in the hydraulic system. The function of the exhaust valve is to remove air and other non-condensable gases in the system to ensure the purity of the hydraulic oil and the normal operation of the system. The exhaust valve is set at the inlet of the distribution transformer 109, which can facilitate the exhaust operation during system startup or maintenance, thereby improving the stability and reliability of the system.

[0059] S103, the servo driver drives the boost cylinder to repeatedly pressurize and release the oil, simulating the thermal expansion and contraction of the oil in the fully sealed distribution transformer.

[0060] The direct charging unit is used to add the estimated amount of oil into the stamping cavity of the booster cylinder 105. This process is achieved through the precise control of the direct charging oil pump and the electromagnetic direct charging valve to ensure that the oil filling amount reaches the predetermined oil level. The selection of oil must meet the working requirements of the transformer, usually transformer-specific insulating oil, to ensure the accuracy of the experimental results.

[0061] Once the oil filling is completed, the servo drive starts to drive the boost cylinder 105 to perform the boost operation. The boost ratio of the boost cylinder 105 is designed to be 40:1, which means that the pressure at the input end will be amplified 40 times before output. The design pressure at the output end is 0.5MPa and the design volume is 15L. These parameters are set according to the experimental requirements and transformer specifications. The servo hydraulic oil pump can accurately control the flow of oil through the stepless speed regulation function of the servo motor, thereby adjusting the driving speed of the boost cylinder 105 and the boost rate of the distribution transformer 109. This adjustment capability makes the experimental process more flexible and precise.

[0062] During the pressurization process, the multifunctional module at the inlet of the distribution transformer 109 plays a crucial role. The module integrates sensors such as the pressure transmitter 107 and the temperature transmitter 108, and can monitor and record the oil level, pressure and temperature data of the fully sealed distribution transformer 109 in real time. These data are crucial for the subsequent analysis of the deformation and resilience of the wave wing, because they directly reflect the working state of the transformer during the simulated thermal expansion and contraction process.

[0063] As the pressure gradually increases, the wave fin will begin to deform. This deformation process can be recorded in real time by visual inspection or by a camera installed at a high position. Observing the deformation of the wave fin helps to understand its response characteristics under different pressures.

[0064] When the pressurization process reaches the predetermined conditions or experimental requirements, the servo drive will gradually reduce the pressure of the hydraulic station. During this process, it is also important to observe the rebound of the wave wing. The rebound data reflects the recovery ability of the wave wing after pressure relief and is a key indicator for evaluating its deformation rebound performance. Similarly, the rebound data can also be obtained through visual inspection or recording equipment.

[0065] S104, obtaining pressure, temperature, deformation and rebound data of corrugated fins during the thermal expansion and contraction process of the oil in the fully sealed distribution transformer.

[0066] After the simulation experiment begins, all integrated sensors will start working, capturing and transmitting data in real time. These data include: Pressure data: reflects the pressure changes at key points of the hydraulic system during the simulation process, which is an important basis for evaluating the stability of the system and the pressure-bearing capacity of the transformer. Temperature data: provides information on the temperature changes of the oil and the surrounding environment, which helps to analyze the impact of thermal expansion and contraction on the internal structure and performance of the transformer. Wave wing deformation data: records the morphological changes of the wave wing under different pressures, which is a key indicator for evaluating the deformation and rebound ability of the wave wing. These data can be extracted and analyzed through the measurement values ​​of the displacement sensor or the video images recorded by the camera. Rebound data: In the final stage of the simulation experiment, the rebound data can be obtained by reducing the pressure of the hydraulic system and observing the rebound of the wave wing. These data are equally important because they reflect the recovery ability of the wave wing after the pressure is released.

[0067] S105, determining the deformation and rebound capability of the wave fin according to the pressure, temperature, deformation and rebound data of the wave fin.

[0068] Accurately record or measure the pressure and temperature data of the wave fin under different working conditions. These data should cover various extreme or conventional working conditions that the wave fin may encounter. At the same time, collect the deformation amount of the wave fin under these specific pressure and temperature conditions and the shape recovery data after rebound.

[0069] Based on actual application scenarios or design requirements, a series of preset temperature and pressure values ​​are set to test the resilience of the wave fin. These values ​​should cover the range that the wave fin may experience and include test points under extreme conditions to evaluate its extreme performance.

[0070] Use environmental control equipment to set the transformer temperature and pressure to preset temperature and pressure conditions to ensure the stability and accuracy of environmental parameters.

[0071] Under the preset conditions, record the key parameters in the deformation process. Then observe and record the springback process of the wave wing.

[0072] S106. Evaluate the safe operation status of the fully sealed distribution transformer according to the resilience.

[0073] In order to evaluate whether the resilience of the wave fin is normal, it is necessary to compare it with a preset standard or benchmark value. These standards may be based on the design specifications, manufacturing requirements, historical data or industry standards of the transformer. By comparing, it can be determined whether the resilience of the wave fin meets the expected requirements.

[0074] The present application also provides a testing device for the deformation and rebound ability of a wave fin, comprising: a hydraulic pump station and a processing module;

[0075] The hydraulic pump station includes a servo drive, a direct charging unit and a booster cylinder 105;

[0076] The servo drive includes an integrated oil tank and a servo hydraulic oil pump, which is used to drive the boost cylinder 105;

[0077] The direct charging unit fills the boost cylinder 105 with oil stored in the integrated tank 101;

[0078] The boost cylinder 105 is connected to a fully sealed distribution transformer 109 through a pipeline;

[0079] The servo driver drives the boost cylinder 105 to repeatedly increase pressure and release pressure, simulating the thermal expansion and contraction of the oil in the fully sealed distribution transformer 109;

[0080] The processing module obtains the pressure, temperature, deformation and rebound data of the wave wing during the thermal expansion and contraction process of the oil in the fully sealed distribution transformer 109; determines the deformation and rebound capacity of the wave wing based on the pressure, temperature, deformation and rebound data of the wave wing; and evaluates the safe operation status of the transformer based on the rebound capacity.

[0081] Furthermore, the servo driver drives the boost cylinder 105 to repeatedly increase pressure and release pressure, simulating the thermal expansion and contraction of the oil in the fully sealed distribution transformer 109, including:

[0082] Using the direct charging unit to fill the oil into the punching cavity of the booster cylinder 105 to reach a predetermined oil level;

[0083] The boost cylinder 105 is driven by the servo driver to perform boosting;

[0084] Monitor and record the oil level, pressure and temperature data of the fully sealed distribution transformer 109;

[0085] Observe the deformation of the wave wing;

[0086] Gradually reduce the hydraulic pressure and observe the rebound of the wave fin to determine whether it can return to its normal shape.

[0087] Furthermore, the booster cylinder 105 is manufactured by using 45# steel, and the piston and piston rod are made of 42CrMo.

[0088] Furthermore, the boosting time of one stroke of the boosting cylinder 105 is greater than or equal to 1 s.

[0089] Further, the servo driver drives the boost cylinder 105 to repeatedly increase pressure and release pressure, including:

[0090] Before the boost cylinder 105 starts to work, if the initial position state of the boost cylinder 105 does not meet the initial setting requirements, the initial state of the boost cylinder 105 is adjusted.

Claims

1. A method for testing the deformation and rebound ability of a wave wing, characterized in that: include: A hydraulic pump station is configured, the hydraulic pump station comprising a servo drive, a direct charging unit and a booster cylinder; the servo drive is used to drive the booster cylinder to increase pressure; the direct charging unit is used to fill a preset amount of oil into the booster cylinder; the booster cylinder is connected to a fully sealed distribution transformer through a pipeline; The servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate the thermal expansion and contraction of the oil in the fully sealed distribution transformer; Acquire pressure, temperature, deformation and rebound data of corrugated fins during the thermal expansion and contraction process of the oil in the fully sealed distribution transformer; Determining the deformation and rebound capability of the wave fin according to the pressure, temperature, deformation and rebound data of the wave fin; The safe operating status of the fully sealed distribution transformer is evaluated based on the resilience.

2. A method for testing the deformation and rebound ability of a wave wing according to claim 1, characterized in that The servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate the thermal expansion and contraction of the oil in the fully sealed distribution transformer, including: Using the direct charging unit to add a preset amount of oil into the stamping cavity of the booster cylinder to reach a predetermined oil level; The boost cylinder is driven by the servo driver to perform boosting; Monitor and record the oil level, pressure and temperature data of the fully sealed distribution transformer; Obtain the deformation of the wave wing; The servo driver drives the boost cylinder to gradually reduce the oil pressure to obtain the rebound condition of the wave wing, and judges whether it can restore to a normal state according to the rebound condition. If it restores to a normal state, it is judged to be a safe operating state; if it does not restore to a normal state, it is judged to be an unsafe operating state.

3. A method for testing the deformation and rebound ability of a wave wing according to claim 1, characterized in that The booster cylinder is made of 45# steel, and the piston and piston rod are made of 42CrMo.

4. A method for testing the deformation and rebound ability of a wave wing according to claim 1, characterized in that , the boosting time of one stroke of the boosting cylinder is greater than or equal to 1s.

5. A method for testing the deformation and rebound ability of a wave wing according to claim 1, characterized in that: Before the servo driver drives the booster cylinder to repeatedly pressurize and release the oil, the method further includes: Before the boost cylinder starts to work, if the initial position state of the boost cylinder does not meet the initial setting requirements, the initial state of the boost cylinder is adjusted.

6. A testing device for the deformation and rebound ability of wave wings, characterized in that: include: Hydraulic pump station and processing module; The hydraulic pump station includes a servo drive, a direct charging unit and a booster cylinder; The servo drive includes an integrated oil tank and a servo hydraulic oil pump for driving the boost cylinder to increase pressure; The direct charging unit fills the boost cylinder with a preset amount of oil stored in the integrated tank; The boost cylinder is connected to a fully sealed distribution transformer via a pipeline; The servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate the thermal expansion and contraction of the oil in the fully sealed distribution transformer; The processing module obtains pressure, temperature, deformation and rebound data of the wave wing in a process simulating thermal expansion and contraction of the oil in the fully sealed distribution transformer; determines the deformation and rebound capacity of the wave wing based on the pressure, temperature, deformation and rebound data of the wave wing; and evaluates the safe operation status of the fully sealed distribution transformer based on the rebound capacity.

7. A testing device for the deformation and rebound ability of wave wings according to claim 6, characterized in that The servo driver drives the booster cylinder to repeatedly pressurize and release the oil to simulate the thermal expansion and contraction of the oil in the fully sealed distribution transformer, including: Using the direct charging unit to add a preset amount of oil into the stamping cavity of the booster cylinder to reach a predetermined oil level; The boost cylinder is driven by the servo driver to perform boosting; Monitor and record the oil level, pressure and temperature data of the fully sealed distribution transformer; Obtain the deformation of the wave wing; The servo driver drives the boost cylinder to gradually reduce the oil pressure to obtain the rebound condition of the wave wing, and judges whether it can restore to a normal state according to the rebound condition. If it restores to a normal state, it is judged to be a safe operating state; if it does not restore to a normal state, it is judged to be an unsafe operating state.

8. A testing device for the deformation and rebound ability of wave wings according to claim 6, characterized in that The booster cylinder is made of 45# steel, and the piston and piston rod are made of 42CrMo.

9. A testing device for the deformation and rebound ability of wave wings according to claim 6, characterized in that , the boosting time of one stroke of the boosting cylinder is greater than or equal to 1s.

10. A testing device for the deformation and rebound ability of a wave wing according to claim 6, characterized in that: The servo driver drives the booster cylinder to repeatedly increase pressure and release pressure, including: Before the boost cylinder starts to work, if the initial position state of the boost cylinder does not meet the initial setting requirements, the initial state of the boost cylinder is adjusted.

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