Pressure wave acquisition device under power frequency discharge in oil and acquisition method thereof

Abstract

The invention relates to a pressure wave collecting device and method under power frequency discharge in oil, a high voltage generating device is used for generating target power frequency voltage, a switching device comprises a relay type mechanical switch, and the switching device is used for keeping the relay type mechanical switch in an off state under the condition that a first control signal is received. And under the condition that a second control signal is received and the target power frequency voltage reaches a preset voltage threshold value, the relay type mechanical switch is in a closed state, so that the oil tank is instantaneously discharged through the high-voltage generation device, and the pressure wave generation and data acquisition device is connected with the relay type mechanical switch. The data acquisition module is used for acquiring voltage data, current data and pressure wave data when the high-voltage generating device instantaneously discharges the oil tank. Therefore, the problem that the characteristics of the pressure waves generated in the power frequency discharge process in the oil are difficult to accurately measure and analyze in the prior art is solved, the pressure wave generation mechanism of the power frequency discharge in the oil can be deeply researched, and a scientific basis is provided for insulation design and operation maintenance of power equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data acquisition, in particular to a pressure wave acquisition device under power frequency discharge in oil and an acquisition method thereof. BACKGROUND

[0002] The discharge phenomenon in oil has important research value in the fields of power equipment and insulation material testing. Discharge in oil not only causes degradation of insulation materials, but also can cause mechanical damage to equipment, and even serious safety accidents. Therefore, studying the characteristics of pressure waves generated during discharge in oil is of great significance for understanding the discharge mechanism, optimizing equipment design, and improving equipment operation safety.

[0003] The related art mainly focuses on discharge characteristics and insulation material performance in the study of discharge in oil, and relatively less on the measurement and analysis of pressure waves generated during discharge. In addition, the experimental device of the related art lacks universality and flexibility, and is difficult to meet different experimental needs.

[0004] Under power frequency conditions, the pressure wave characteristics of discharge in oil are significantly different from those under high-frequency or low-frequency discharge conditions. During power frequency discharge, the voltage and current change relatively slowly, and the discharge energy is released relatively uniformly, resulting in more complex generation and propagation mechanisms of pressure waves. Therefore, the related art is difficult to accurately measure and analyze the pressure wave characteristics generated during power frequency discharge in oil, which needs to be solved urgently. SUMMARY

[0005] The present application provides a pressure wave acquisition device under power frequency discharge in oil and an acquisition method thereof to solve the problem that the related art is difficult to accurately measure and analyze the pressure wave characteristics generated during power frequency discharge in oil. The present application can further study the pressure wave generation mechanism of power frequency discharge in oil and provide a scientific basis for the insulation design and operation and maintenance of power equipment.

[0006] The first aspect of the present application provides a pressure wave acquisition device under power frequency discharge in oil, comprising: a high-voltage generating device, a switching device, and a pressure wave generating and data acquisition device, wherein,

[0007] The high-voltage generating device is configured to generate a target power frequency voltage;

[0008] The switching device comprises a relay mechanical switch, and the switching device is configured to keep the relay mechanical switch in an open state when receiving a first control signal, and keep the relay mechanical switch in a closed state when receiving a second control signal and the target power frequency voltage reaches a preset voltage threshold, so as to discharge the oil tank instantaneously by the high-voltage generating device;

[0009] The pressure wave generation and data acquisition device is configured to acquire voltage data, current data and pressure wave data when the high-voltage generation device instantaneously discharges the oil tank.

[0010] Optionally, in some embodiments, the high-voltage generation device comprises:

[0011] a control unit configured to send a control signal;

[0012] a voltage regulation unit configured to generate an input voltage according to the control signal;

[0013] a transformer configured to boost the input voltage to the target power frequency voltage.

[0014] Optionally, in some embodiments, the high-voltage generation device further comprises:

[0015] a control module configured to send the first control signal according to a first control instruction, or send the second control signal according to a second control instruction.

[0016] Optionally, in some embodiments, the switch device further comprises:

[0017] a receiving unit configured to, in a case where the first control signal is received, output a first voltage so that the relay mechanical switch maintains the open state based on the first voltage; or, in a case where the second control signal is received and the target power frequency voltage reaches the preset voltage threshold, stop outputting the first voltage so that the relay mechanical switch is in a closed state to instantaneously discharge the oil tank.

[0018] Optionally, in some embodiments, the pressure wave generation and data acquisition device comprises:

[0019] a current data acquisition module configured to acquire current data when the high-voltage generation device instantaneously discharges the oil tank;

[0020] a voltage data acquisition module configured to acquire voltage data when the high-voltage generation device instantaneously discharges the oil tank;

[0021] a pressure wave data acquisition module configured to acquire pressure wave data when the high-voltage generation device instantaneously discharges the oil tank.

[0022] Optionally, in some embodiments, the pressure wave generation and data acquisition device further comprises:

[0023] an overcurrent time delay relay configured to control the high-voltage generation device to disconnect power supply when the current data acquired by the current data acquisition module is greater than a preset current threshold.

[0024] Optionally, in some embodiments, the high-voltage generation device further comprises:

[0025] a data analysis module configured to acquire the voltage data, the current data and the pressure wave data, and analyze the pressure wave generated by the power frequency discharge in the oil according to the voltage data, the current data and the pressure wave data.

[0026] Optionally, in some embodiments, the current data acquisition module is a ring current transformer, the voltage data acquisition module is a capacitive voltage divider type high voltage transformer, and the pressure wave data acquisition module is a pressure wave sensor.

[0027] Optionally, in some embodiments, the method further comprises:

[0028] a visualization module configured to visualize the voltage data, the current data and the pressure wave data.

[0029] The second aspect embodiment of the present application provides an oil power frequency discharge pressure wave acquisition method, which uses the oil power frequency discharge pressure wave acquisition device described above, and comprises the following steps:

[0030] generating a target power frequency voltage through a high voltage generating device;

[0031] receiving a first remote control signal or a second remote control signal through a switch device, and according to the first remote control signal, disconnecting a relay type mechanical switch, or according to the second remote control signal, closing the relay type mechanical switch to instantaneously discharge the oil tank when the target power frequency voltage reaches a preset voltage threshold;

[0032] acquiring voltage data, current data and pressure wave data of the instantaneously discharging of the relay type mechanical switch to the oil tank through a pressure wave generating and data acquisition device.

[0033] Therefore, the present application has the following beneficial effects:

[0034] (1) The present application can accurately measure and analyze the voltage, current and pressure wave characteristics in the power frequency discharge process in the oil. The present application uses a high voltage transformer and a current transformer to respectively monitor the voltage and current in the discharge process in real time, and combines a high-precision pressure wave sensor to capture the dynamic pressure wave signal generated by the discharge in the oil.

[0035] (2) The application can explore the propagation characteristics and spatial distribution of pressure waves in oil by changing the installation position of the pressure sensor, providing experimental basis for studying the pressure wave propagation mechanism of discharge in oil. The experimental platform can obtain multi-dimensional data of voltage, current and pressure wave at the same time. Through data analysis software, time domain and frequency domain waveform graphs are generated, which facilitates in-depth analysis of the coupling relationship between the three. It not only effectively explores the change process of important parameters in the power frequency discharge process in oil, but also provides a scientific basis for the insulation design, fault diagnosis and operation and maintenance of power equipment.

[0036] (3) The experimental steps provided by the application are reasonable and simple to operate, which can effectively capture the transient changes in the discharge process and ensure the accuracy and reliability of the experimental data. Through multiple experiments and data averaging, the experimental error caused by randomness can be significantly reduced, and the repeatability and consistency of the data can be improved.

[0037] (4) The application uses a relay mechanical switch and a remote control to ensure the safety and convenience of the experimental process. Through the voltage regulation function of the high-voltage generating device, the discharge voltage can be flexibly adjusted to meet the needs of different experimental conditions. It not only provides a reliable experimental platform for the study of pressure wave characteristics in power frequency discharge in oil, but also provides technical support for the insulation performance evaluation, partial discharge detection and fault warning of power equipment, and has a wide application prospect.

[0038] Additional aspects and advantages of the application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0040] Figure 1 A schematic diagram of a pressure wave acquisition device in power frequency discharge in oil according to an embodiment of the application is shown;

[0041] Figure 2 An example diagram of a pressure wave acquisition device in power frequency discharge in oil according to an embodiment of the application is shown;

[0042] Figure 3 A flowchart of a pressure wave acquisition method in power frequency discharge in oil according to an embodiment of the application is shown. DETAILED DESCRIPTION

[0043] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0044] The pressure wave acquisition device under power frequency discharge in oil and the acquisition method thereof of the embodiments of the present application are described below with reference to the drawings. In view of the problem that the related art mentioned in the background art is difficult to accurately measure and analyze the pressure wave characteristics generated in the power frequency discharge process in oil, the present application provides a pressure wave acquisition device under power frequency discharge in oil. In the device, a target power frequency voltage is generated by a high-voltage generating device, a first remote control signal or a second remote control signal is received by a switching device, and the relay type mechanical switch is opened according to the first remote control signal, or the relay type mechanical switch is closed according to the second remote control signal when the target power frequency voltage reaches the preset voltage threshold to momentarily discharge the oil tank, and the voltage data, current data and pressure wave data when the relay type mechanical switch momentarily discharges the oil tank are obtained by the pressure wave generating and data acquisition device. Thus, the problem that the related art is difficult to accurately measure and analyze the pressure wave characteristics generated in the power frequency discharge process in oil is solved, and the pressure wave generation mechanism of the power frequency discharge in oil can be deeply studied, and scientific basis can be provided for the insulation design and operation and maintenance of power equipment.

[0045] Specifically, Figure 1 A schematic diagram of a pressure wave acquisition device under power frequency discharge in oil provided by the embodiments of the present application.

[0046] As Figure 1 shown, the pressure wave acquisition device under power frequency discharge in oil 100 includes a high-voltage generating device 1000, a switching device 2000 and a pressure wave generating and data acquisition device 3000.

[0047] The high-voltage generating device 1000 is configured to generate a target power frequency voltage, the switching device 2000 includes a relay type mechanical switch, the relay type mechanical switch remains in an open state when receiving a first control signal, and the relay type mechanical switch is in a closed state when receiving a second control signal and the target power frequency voltage reaches a preset voltage threshold, so as to momentarily discharge the oil tank by the high-voltage generating device 1000, and the pressure wave generating and data acquisition device 3000 is configured to obtain voltage data, current data and pressure wave data when the high-voltage generating device 1000 momentarily discharges the oil tank.

[0048] Optionally, in some embodiments, the high-voltage generating device 1000 includes a control unit, a voltage regulating unit and a transformer.

[0049] The control unit is configured to send a control signal; the voltage regulating unit is configured to generate an input voltage according to the control signal; and the transformer is configured to step up the input voltage to a target power frequency voltage.

[0050] Preferably, the control unit is a low-voltage control console, and the voltage regulating unit is a voltage regulating device.

[0051] Specifically, the high-voltage generating device 100 is configured to generate a power frequency high voltage, a low-voltage control console is configured to control a relay control circuit of a voltage regulating device, a motor structure in a contact type electric voltage regulating device is configured to adjust an output voltage, and the output voltage is between 20 kV and 100 kV, so as to ensure that a discharge voltage is within a required range.

[0052] Optionally, in some embodiments, the switch device 2000 further comprises a receiving unit.

[0053] The receiving unit is configured to, in a case where the first control signal is received, output a first voltage, so that the relay type mechanical switch remains in an open state based on the first voltage; or, in a case where the second control signal is received and the target power frequency voltage reaches a preset voltage threshold, stop outputting the first voltage, so that the relay type mechanical switch is in a closed state to instantaneously discharge the oil tank.

[0054] In the embodiments of the present application, the preset voltage threshold can be preset by a user, can be obtained through a limited number of experiments, or can be obtained through a limited number of computer simulations, and is not limited here.

[0055] Optionally, in some embodiments, the switch device 2000 further comprises a control module.

[0056] The control module is configured to send the first control signal according to the first control instruction, or send the second control signal according to the second control instruction.

[0057] Preferably, the control module can be a remote controller, and the receiving unit can be a signal receiver.

[0058] Specifically, the voltage output by the high-voltage generating device 1000 is connected to a conductive iron block of a relay type mechanical switch of the switch module 2000 through a high-voltage lead. In a test preparation stage, the relay infrared receiving module is connected to a 24V direct current voltage, a current is set to 180mA, a key A of a remote controller is pressed, the receiving module outputs a 24V voltage, so that the mechanical switch remains in a magnetic attraction state before a specified voltage is reached, which represents that the mechanical switch is open. When the output voltage of the transformer reaches the specified voltage, the receiving module is controlled by pressing a key C of the remote controller, the receiving module stops outputting the 24V voltage, so that the electromagnet has no magnetism, a switch arm lever is released, and a closure is formed at a high-voltage end to instantaneously discharge the oil tank, so as to ensure accurate control of a discharge process. The switch arm lever of the mechanical switch is connected to a needle electrode of the oil tank through a lead.

[0059] Optionally, in some embodiments, the pressure wave generation and data acquisition device 3000 comprises: a current data acquisition module, a voltage data acquisition module, and a pressure wave data acquisition module.

[0060] The current data acquisition module is configured to acquire current data when the high-voltage generating device instantaneously discharges the oil tank; the voltage data acquisition module is configured to acquire voltage data when the high-voltage generating device instantaneously discharges the oil tank; and the pressure wave data acquisition module is configured to acquire pressure wave data when the high-voltage generating device instantaneously discharges the oil tank.

[0061] Preferably, the current data acquisition module is a ring current transformer, the voltage data acquisition module is a capacitor voltage division type high-voltage transformer, the pressure wave data acquisition module is a pressure wave sensor, the oil tank is made of 304 stainless steel, contains brass needle plate electrodes, is filled with transformer oil, has a screw channel for installing a pressure sensor on the side wall of the oil tank, and has an oil inlet on the upper cover plate of the oil tank. An insulating sleeve made of cross-linked polyethylene is used between the needle electrode and the oil tank for insulation between the high-voltage electrode and the oil tank, and the plate electrode is reliably connected to the ground wire. The oil tank is used for high-voltage power frequency discharge test in oil.

[0062] Specifically, the high-voltage transformer is used to measure the voltage change during discharge, the high-voltage end is connected to the conductive iron block of the mechanical switch, and the low-voltage end is connected to the oscilloscope for real-time observation of voltage change and data transmission to the data acquisition card. In the embodiment of the application, the ground wire of the oil tank passes through the current transformer for the current transformer to measure the current change during discharge and transmit the data to the data acquisition card. The pressure wave sensor module is used to detect and measure the pressure wave generated by the discharge in the oil, which can measure the dynamic pressure change during discharge, not the static pressure. The pressure sensor probe is installed at different positions on the side wall of the oil tank to measure the analog signals of the pressure waves at each position, and the analog signals are converted into digital signals by the transmitter and transmitted to the data acquisition card through the cable.

[0063] Optionally, in some embodiments, the pressure wave generation and data acquisition device 3000 further comprises an overcurrent delay relay.

[0064] The overcurrent delay relay is configured to control the high-voltage generating device to disconnect the power supply when the current data collected by the current data acquisition module is greater than a preset current threshold. The preset current threshold can be preset by the user, can be obtained through a limited number of experiments, or can be obtained through a limited number of computer simulations, and is not limited here.

[0065] Specifically, in the case of breakdown in oil, the current detected by the current detection module is automatically controlled by the current delay relay to control the console to open.

[0066] Optionally, in some embodiments, a data analysis module is also included.

[0067] The data analysis module is used to acquire voltage data, current data, and pressure wave data, and to analyze the pressure wave generated during the power frequency discharge process in the oil based on the voltage data, current data, and pressure wave data.

[0068] Optionally, in some embodiments, a visualization module is also included.

[0069] The visualization module is used to visualize voltage data, current data, and pressure wave data.

[0070] Specifically, in this embodiment, the data analysis module can be a data analysis software. This software receives and processes multi-dimensional data collected from voltage, current, and pressure wave sensors. The software can not only display the dynamic changes in voltage and current in real time, but also accurately capture the subtle characteristics of pressure wave propagation in oil. Through efficient data processing algorithms, the software can generate intuitive waveforms, visually displaying the time and frequency domain characteristics of the discharge process. Simultaneously, the software possesses powerful data analysis capabilities, capable of analyzing the collected data and automatically generating detailed data analysis reports. This provides users with a comprehensive assessment of the discharge state, location, and intensity in the oil, thereby providing a scientific basis for the maintenance and fault diagnosis of electrical equipment.

[0071] Therefore, the embodiments of this application can accurately measure and analyze the pressure wave characteristics generated during power frequency discharge in oil, providing a scientific basis for the insulation design and operation and maintenance of power equipment. It can also conduct in-depth research on the pressure wave generation mechanism, propagation characteristics and impact on equipment during power frequency discharge in oil, providing strong support for research and application in related fields.

[0072] To enable those skilled in the art to further understand the pressure wave acquisition device under power frequency discharge in oil according to the embodiments of this application, the following detailed description is provided in conjunction with specific embodiments.

[0073] like Figure 2 As shown, Figure 2 This is a schematic diagram of a pressure wave acquisition device under power frequency discharge in oil according to an embodiment of this application.

[0074] The high-voltage generating device: contains a master control circuit (1), adopts a contact type electric dynamic voltage regulating device (2), a step-up transformer (variable ratio range 1:100-1:1000), and a resistor (resistance range 500-2000Ω). The embodiment of the application adjusts the motor drive gear structure through the console, changes the primary input voltage (380V power frequency alternating current) of the transformer, outputs the power frequency high voltage (10kV-50kV adjustable) at the secondary side, and connects the conductive iron block (3) of the relay type mechanical switch through the high-voltage wire. The overcurrent protection module is built-in the voltage regulating device. When the output current exceeds the set threshold, the overcurrent delay relay built-in the console is connected through the wire (23) to control the automatic tripping, ensuring the safety of the experiment.

[0075] The relay type mechanical switch: the switch body (21) is made of wood, the electromagnetic part is composed of an electromagnet (5) (maximum suction force 40kg, rated voltage 24V, rated current 180mA), a switch arm rod (4) (304 stainless steel material) and a magnetic pure iron block. The electromagnet is linked with the infrared remote controller (22) through the infrared receiving module (6). The working voltage of the infrared module is direct current 24V, which is provided by the power supply (7).

[0076] When the electromagnet is not powered, the spring mechanism keeps the switch arm rod in the open state; when the remote controller sends a trigger signal (A key controls power-on adsorption, and C key controls power-off release), the electromagnet is attracted or released, accurately controlling the on-off of the high-voltage loop (response time ≤1ms).

[0077] The needle plate oil tank: the oil tank (11) is made of 304 stainless steel (wall thickness 5mm, size 300mm×300mm×200mm), and is filled with transformer oil (dielectric strength ≥45kV / 2.5mm) inside. The needle electrode is made of brass (8) (tip curvature radius 0.1mm), and the plate electrode is a circular copper plate (12) (diameter 100mm). The plate electrode is reliably connected to the ground wire (25), and the electrode spacing is controlled by a micro-adjusting screw (adjusting accuracy 0.1mm). The oil tank is provided with an observation window (15) for later optical tests. The transformer oil is input through the oil inlet (24).

[0078] The insulating sleeve (9) is made of cross-linked polyethylene material (voltage resistance grade ≥100kV), and is sealed to prevent oil leakage. The oil tank side wall is pre-provided with M6 threaded holes (10) (13) (14) for installing a dynamic pressure sensor (range 0-300kPa, frequency response ≥100kHz).

[0079] The data acquisition system comprises: voltage acquisition: a capacitive voltage divider type high voltage transformer (18) (dividing ratio 1000:1, bandwidth 0-1 MHz) is adopted, the high voltage end is connected to the conductive iron block of the mechanical switch, and the low voltage end is connected to an oscilloscope (sampling rate 1 GS / s) and a data acquisition card (19) (16-bit ADC); current acquisition: a toroidal current transformer (17) (transformation ratio 1000:1, frequency response 0-200 kHz) is adopted in series in the grounding circuit, and the output signal is transmitted to the data acquisition card after being filtered and amplified by a signal conditioning circuit; pressure wave acquisition: the pressure wave sensor (16) has a range of 0-300 kPa, an overload capacity of 1.5 times the rated pressure, and a breaking pressure of 2 times the rated pressure, and is installed with a thread M12*1, an output signal of 0-5 VDC, a power supply voltage of 15-24 VDC, an accuracy level of less than 0.5, and a signal transmission of 10 meters of shielding cable; the analog signal is converted into a digital signal by the pressure wave transmitter (16) and then transmitted to the data acquisition card.

[0080] Finally, based on the LabVIEW platform (20), a signal processing module (FFT analysis, wavelet denoising), a data visualization module (time domain waveform, frequency domain spectrum) and a report generation module are developed and integrated, multi-channel synchronous acquisition (voltage, current, pressure wave signal synchronization error ≤1 μs) is supported, and the discharge energy W = ∫U(t)·I(t)dt and the pressure wave peak P Peak are calculated in real time; the pressure wave signal adopts an adaptive threshold denoising algorithm to eliminate oil flow noise interference, and the discharge time constant (R is the loop resistance and C is the equivalent capacitance) is automatically calculated by fitting the voltage decay curve.

[0081] In the embodiment of the present application, the high-voltage wire adopts a double-layer shielding structure (inner copper mesh shielding and outer Teflon insulation) to reduce electromagnetic interference during discharge; optical fiber transmission is adopted between the data acquisition card and the sensor to avoid crosstalk of high-voltage discharge on weak electrical signals; a shock-absorbing rubber pad (damping coefficient 0.8) is installed on the oil tank base to reduce the influence of external vibration on pressure wave measurement; a multi-strand copper strand (cross-sectional area ≥25 mm 2 ) is adopted for the grounding system, and a grounding resistance tester is used to ensure that the grounding resistance is ≤1 Ω.

[0082] In addition, the embodiment of the present application also has expansion functions and compatibility: (1) when different media (such as silicone oil and mineral oil) are replaced, the transformer transformation ratio and the electrode spacing are adjusted to adapt to the experimental requirements of different dielectric strengths; (2) an external high-speed camera (frame rate ≥100,000 fps) is supported, and the dynamic evolution process of the discharge plasma channel is recorded through the observation window; (3) an infrared module remote controller is adopted, the maximum control distance is 100 m, the discharge parameters (voltage, frequency, number of times) can be preset through the upper computer software, and the automatic experimental process is realized.

[0083] The following is a detailed description of the experimental process based on the pressure wave acquisition device of the power frequency discharge in the oil of the embodiment of the present application.

[0084] Oil tank preparation: inject an appropriate amount of transformer oil into the needle plate oil tank to ensure that the oil fills the oil tank. Close the valve and check the sealing of the oil tank to ensure that there is no leakage.

[0085] Step one: preparation before experiment.

[0086] 1. Electrode installation: install the brass needle electrode and plate electrode into the oil tank, ensure that the distance between the needle electrode and the plate electrode meets the experimental requirements, use an insulating sleeve made of cross-linked polyethylene material to insulate the needle electrode from the oil tank, and reliably connect the plate electrode to the ground wire.

[0087] 2. Sensor installation: install pressure sensor probes at different positions on the side wall of the oil tank, ensure that the probes are in close contact with the oil tank wall, avoid oil leakage, and convert the analog signal to a digital signal through the transmitter and connect it to the data acquisition card through the cable. The selected pressure wave sensor has a range of 0-300kPa.

[0088] 3. Circuit connection: connect the high-voltage generating device to the conductive iron block of the relay mechanical switch through high-voltage wires, and connect the mechanical switch arm rod to the needle electrode of the oil tank through wires; the high-voltage end of the voltage data acquisition module is connected to the conductive iron block of the mechanical switch, and the low-voltage end is connected to the oscilloscope; the current transformer of the current data acquisition module passes through the ground wire of the oil tank to ensure accurate current measurement.

[0089] 4. System check: check whether there are virtual connections, short circuits and other abnormal phenomena between modules, and ensure that there are no signs of aging and damage. Confirm that the remote control, data acquisition card, oscilloscope and other equipment are working properly.

[0090] Step two: pre-discharge stage.

[0091] 1. Low voltage test: use a lower voltage for pre-discharge detection to check whether each data acquisition module is working properly, and ensure that the voltage, current and pressure wave signals can be displayed normally. If there are abnormal conditions, troubleshoot one by one until the problem is solved.

[0092] 2. System debugging: control the relay mechanical switch through the remote control A key to ensure that the mechanical switch remains in the magnetic attraction state (off state) before reaching the specified voltage, and adjust the sampling frequency of the oscilloscope and data acquisition card to ensure that the rapidly changing signals during discharge can be captured.

[0093] Step three: high-voltage discharge experiment.

[0094] 1. Set the discharge parameters: according to the experimental requirements, set the output voltage of the high-voltage generating device, and control the relay mechanical switch through the remote control C key to ensure that the mechanical switch is released when the specified voltage is reached, forming a closed loop to discharge the oil tank instantaneously.

[0095] 2. Data acquisition: during the discharge process, the voltage data acquisition module measures the voltage change in real time through the high-voltage transformer, the current data acquisition module measures the current change in real time through the current transformer, and the pressure wave data acquisition module measures the pressure wave generated by the discharge in the oil in real time through the pressure sensor. All data is transmitted to the data analysis software through the data acquisition card.

[0096] 3. Multiple experiments: due to the randomness of the discharge experiment, the discharge data and waveform under the same discharge parameters may differ, in order to ensure the accuracy and reliability of the experimental data, each experiment needs to be repeated three times, and the average value is taken as the final result.

[0097] Step four: end of experiment.

[0098] 1. Residual energy release: after the discharge experiment is completed, use the grounding rod to release the residual energy in the circuit system, ensure that the residual voltage is below the human body safe voltage, wait for 3 minutes, and then approach the oil tank for subsequent operation.

[0099] 2. Data saving and analysis: save the voltage, current and pressure wave data collected during the experiment to the computer, use the data analysis software to generate waveform graphs and data analysis reports, analyze the voltage, current and pressure wave change law during the discharge process through the software, evaluate the discharge state, discharge location and discharge intensity.

[0100] 3. Equipment cleaning and maintenance: after the experiment is completed, clean the transformer oil in the oil tank, check the state of each sensor and electrode, ensure that there is no damage, and maintain the high-voltage generating device, relay mechanical switch and other equipment to ensure the normal operation of the next experiment.

[0101] The experimental steps of the embodiments of the present application are reasonable in design and simple in operation, which can effectively capture the transient changes in the discharge process, ensure the accuracy and reliability of the experimental data, and through multiple experiments and data averaging, the experimental error caused by randomness can be significantly reduced, and the repeatability and consistency of the data can be improved.

[0102] The pressure wave acquisition device under oil power frequency discharge provided by the embodiment of the present application generates a target power frequency voltage through a high-voltage generating device, receives a first remote control signal or a second remote control signal through a switching device, and according to the first remote control signal, disconnects a relay type mechanical switch, or according to the second remote control signal, closes the relay type mechanical switch to instantaneously discharge the oil tank when the target power frequency voltage reaches a preset voltage threshold. The voltage data, current data and pressure wave data when the relay type mechanical switch instantaneously discharges the oil tank are acquired through a pressure wave generating and data acquisition device. Thus, the problem that the related art cannot accurately measure and analyze the pressure wave characteristics generated in the oil power frequency discharge process is solved, and the pressure wave generation mechanism of the oil power frequency discharge can be deeply researched, and a scientific basis for the insulation design and operation and maintenance of power equipment is provided.

[0103] Secondly, the pressure wave acquisition method under oil power frequency discharge provided by the embodiment of the present application is described with reference to the accompanying drawings.

[0104] Figure 3 The flowchart of the pressure wave acquisition method under oil power frequency discharge of the embodiment of the present application is shown in FIG. 3.

[0105] As shown in FIG. 3, the pressure wave acquisition method under oil power frequency discharge includes the following steps. Figure 3

[0106] In step S301, a target power frequency voltage is generated through a high-voltage generating device.

[0107] In step S302, a first remote control signal or a second remote control signal is received through a switching device, and according to the first remote control signal, a relay type mechanical switch is disconnected, or according to the second remote control signal, the relay type mechanical switch is closed to instantaneously discharge the oil tank when the target power frequency voltage reaches a preset voltage threshold.

[0108] In step S303, voltage data, current data and pressure wave data when the relay type mechanical switch instantaneously discharges the oil tank are acquired through a pressure wave generating and data acquisition device.

[0109] It should be noted that the foregoing explanation and description of the pressure wave acquisition device under oil power frequency discharge embodiment are also applicable to the pressure wave acquisition method under oil power frequency discharge of the embodiment, which will not be described here again.

[0110] ​The pressure wave acquisition method under the power frequency discharge in oil according to the embodiment of the present application generates a target power frequency voltage through a high-voltage generating device, receives a first remote control signal or a second remote control signal through a switch device, and according to the first remote control signal, disconnects a relay type mechanical switch, or according to the second remote control signal, closes the relay type mechanical switch to discharge the oil tank instantaneously when the target power frequency voltage reaches a preset voltage threshold, and through a pressure wave generating and data acquisition device, voltage data, current data and pressure wave data when the relay type mechanical switch discharges the oil tank instantaneously are acquired. Therefore, the problem that the related art cannot accurately measure and analyze the pressure wave characteristics generated in the power frequency discharge process in oil is solved, and the power frequency discharge pressure wave generation mechanism in oil can be deeply researched, and scientific basis can be provided for the insulation design and operation and maintenance of power equipment.

[0111] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0112] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one feature. In the description of the present application, the meaning of "N" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0113] Any process or method descriptions in flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions (or steps) in the process, and the preferred embodiments of the present application include additional implementations in which the order of execution or the functions themselves can be changed, including by being performed substantially concurrently or in reverse order. Accordingly, embodiments of the present application should not be construed as limited to any specific combination of functions or steps unless otherwise specifically stated.

[0114] It should be understood that portions of the application can be implemented in hardware, software, firmware, or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or their combinations, can be used to implement: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays, field programmable gate arrays, etc.

[0115] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0116] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A pressure wave acquisition device for power frequency discharge in oil, characterized in that, include: High-voltage generating device, switching device, and pressure wave generating and data acquisition device, among which, The high-voltage generating device is used to generate the target power frequency voltage; The switching device includes a relay-type mechanical switch, which is used to keep the relay-type mechanical switch in an open state when a first control signal is received, and to close the relay-type mechanical switch when a second control signal is received and the target power frequency voltage reaches a preset voltage threshold, so as to discharge the oil tank instantaneously through the high voltage generator. The pressure wave generating and data acquisition device is used to acquire voltage data, current data and pressure wave data when the high-voltage generating device instantaneously discharges to the oil tank.

2. The apparatus according to claim 1, characterized in that, The high-voltage generating device includes: The control unit is used to issue control signals; A voltage regulating unit is used to generate an input voltage according to the control signal; A transformer is used to boost the input voltage to the target power frequency voltage.

3. The apparatus according to claim 1, characterized in that, Also includes: The control module is used to issue the first control signal according to the first control instruction, or to issue the second control signal according to the second control instruction.

4. The apparatus according to claim 1, characterized in that, Also includes: The switching device further includes: A receiving unit is configured to output a first voltage upon receiving the first control signal, such that the relay-type mechanical switch maintains the open state based on the first voltage; Alternatively, upon receiving the second control signal and when the target power frequency voltage reaches the preset voltage threshold, the first voltage is stopped from being output, causing the relay-type mechanical switch to be in a closed state to instantaneously discharge the oil tank.

5. The apparatus according to claim 1, characterized in that, The pressure wave generating and data acquisition device includes: The current data acquisition module is used to acquire the current data when the high-voltage generator instantaneously discharges to the oil tank; The voltage data acquisition module is used to acquire voltage data when the high-voltage generator instantaneously discharges to the oil tank; The pressure wave data acquisition module is used to acquire pressure wave data when the high-pressure generator instantaneously discharges onto the oil tank.

6. The apparatus according to claim 1, characterized in that, The pressure wave generating and data acquisition device further includes: An overcurrent delay relay is used to control the high-voltage generator to disconnect the power supply when the current data acquired by the current data acquisition module is greater than a preset current threshold.

7. The apparatus according to claim 1, characterized in that, Also includes: The data analysis module is used to acquire the voltage data, the current data, and the pressure wave data, and to analyze the pressure wave generated by the power frequency discharge process in the oil based on the voltage data, the current data, and the pressure wave data.

8. The apparatus according to claim 4, characterized in that, The current data acquisition module is a ring current transformer, the voltage data acquisition module is a capacitive voltage divider high-voltage transformer, and the pressure wave data acquisition module is a pressure wave sensor.

9. The apparatus according to claim 1, characterized in that, Also includes: A visualization module is used to visualize the voltage data, the current data, and the pressure wave data.

10. A method for acquiring pressure waves under power frequency discharge in oil, characterized in that, The pressure wave acquisition device under power frequency discharge in oil as described in any one of claims 1-9 includes the following steps: The target power frequency voltage is generated by a high-voltage generator; The device receives a first remote control signal or a second remote control signal through a switching device, and disconnects the relay mechanical switch according to the first remote control signal, or closes the relay mechanical switch to instantaneously discharge the oil tank according to the second remote control signal when the target power frequency voltage reaches a preset voltage threshold. The voltage, current, and pressure wave data of the relay mechanical switch instantaneously discharging into the oil tank are acquired by the pressure wave generator and data acquisition device.

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