Transformer oil degradation detection method and device, terminal and computer storage medium

Abstract

The invention provides a transformer oil degradation detection method and device, a terminal and a computer storage medium, and the method comprises the steps: transmitting corresponding test radio frequency magnetic field pulse sequences to a transformer oil circulation pipeline based on a preset test magnetic field intensity group, so as to obtain corresponding test echo chain signals; performing inverse Laplace transformation on each test echo chain signal, and calculating each corresponding test transverse relaxation time distribution spectrum; acquiring a reference transverse relaxation time distribution spectrum corresponding to each test transverse relaxation time distribution spectrum; and respectively calculating the deviation value of each test transverse relaxation time distribution spectrum relative to the corresponding reference transverse relaxation time distribution spectrum, and obtaining the deterioration degree of the transformer oil in the transformer oil circulation pipeline based on each deviation value so as to realize online detection of the deterioration condition of the transformer oil.

Description

Technical Field

[0001] This application belongs to the field of transformers and relates to a transformer oil testing technology, particularly a transformer oil deterioration testing method, device, terminal, and computer storage medium. Background Technology

[0002] Transformer oil refers to the insulating oil inside a transformer. It is used to insulate the various components inside the transformer, suppress electric arcs, and provide cooling, thereby ensuring the safe and stable operation of the transformer. Because transformer oil gradually deteriorates under the influence of various factors such as high temperature, oxidation, moisture, and electric field stress, its insulation performance declines, leading to an increased risk of transformer failure. Therefore, it is necessary to monitor the deterioration of the transformer oil to ensure that its performance meets the requirements for transformer operation.

[0003] Commonly used methods for transformer oil testing include gas chromatography, infrared spectroscopy, physicochemical property testing, and partial discharge detection. However, these existing methods are all offline testing methods based on transformer oil sampling, and cannot provide real-time feedback on the deterioration of the transformer oil. This results in a lag in the test results, making it difficult to guide timely maintenance or replacement of the transformer oil. Furthermore, human error can easily be introduced during the sampling and delivery of transformer oil for testing, thus affecting the accuracy of the test results.

[0004] Therefore, how to achieve online detection of transformer oil deterioration is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a method, device, terminal and computer storage medium for detecting transformer oil deterioration, which solves the problems of existing technologies that usually require sampling of transformer oil and offline detection of its deterioration, resulting in delayed detection results and easy introduction of human operation errors.

[0006] In a first aspect, this application provides a method for detecting transformer oil degradation, comprising: transmitting corresponding test radio frequency magnetic field pulse sequences to the transformer oil circulation pipeline to be tested based on a preset test magnetic field strength group to obtain corresponding test echo chain signals; the test magnetic field strength group includes at least one test magnetic field strength, and each test echo chain signal corresponds one-to-one with each test magnetic field strength; performing inverse Laplace transform on each test echo chain signal to calculate the corresponding test transverse relaxation time distribution spectrum; obtaining the reference transverse relaxation time distribution spectrum corresponding to each test transverse relaxation time distribution spectrum; calculating the offset value of each test transverse relaxation time distribution spectrum relative to the corresponding reference transverse relaxation time distribution spectrum, and obtaining the degree of degradation of the transformer oil in the transformer oil circulation pipeline based on each offset value.

[0007] In one embodiment of this application, the test radio frequency magnetic field pulse sequence is composed of an excitation radio frequency magnetic field pulse, a first refocusing radio frequency magnetic field pulse, and a second refocusing radio frequency magnetic field pulse arranged in a preset order. For any test magnetic field intensity in the test magnetic field intensity group, obtaining the corresponding test echo chain signal includes: calculating the corresponding pulse frequency based on the test magnetic field intensity; generating the excitation radio frequency magnetic field pulse, the first refocusing radio frequency magnetic field pulse, and the second refocusing radio frequency magnetic field pulse based on the pulse frequency; transmitting the corresponding excitation radio frequency magnetic field pulse to the transformer oil circulation pipeline; and transmitting the refocusing radio frequency magnetic field pulse after half the echo time, and receiving the echo signal radiated from the transformer oil in the transformer oil circulation pipeline; obtaining the current total number of echoes; and in the previous refocusing... After a radio frequency magnetic field pulse is transmitted at an echo time interval, the refocusing radio frequency magnetic field pulse is retransmitted, and the echo signal radiated by the transformer oil in the transformer oil circulation pipeline is received. If the current total number of echoes is not less than a preset number of echoes, the echo chain signal is obtained based on each received echo signal. Otherwise, the current total number of echoes is incremented to obtain a new current total number of echoes, and the refocusing radio frequency magnetic field pulse is retransmitted to receive the echo signal. The echo time is used to characterize the time required from the transmission of the radio frequency magnetic field pulse to the peak of the echo. Each refocusing radio frequency magnetic field pulse is an alternately transmitted first refocusing radio frequency magnetic field pulse and a second refocusing radio frequency magnetic field pulse, and the first refocusing radio frequency magnetic field pulse and the second refocusing radio frequency magnetic field pulse are phase-reversed.

[0008] In one embodiment of this application, the method for calculating the offset value of any test transverse relaxation time distribution spectrum relative to the corresponding reference transverse relaxation time distribution spectrum includes: obtaining the position and area of ​​each test spectral peak based on the test transverse relaxation time distribution spectrum, and obtaining the position and area of ​​each reference spectral peak based on the reference transverse relaxation time distribution spectrum; matching each test spectral peak with each reference spectral peak; if there is a matching test spectral peak, calculating the position offset value and area change value of the test spectral peak relative to the corresponding reference spectral peak; otherwise, calculating the area value of the test spectral peak; performing a weighted summation of each position offset value, each area change value, and each area value, and using the weighted summation value as the offset value; wherein the weight of each area value is greater than the weight of each position offset value and each area change value.

[0009] In one embodiment of this application, the step of obtaining the degree of deterioration of the transformer oil in the transformer oil circulation pipeline based on each of the offset values ​​includes: obtaining a preset offset threshold; if any of the offset values ​​is greater than the offset threshold, a response operation is triggered.

[0010] In one embodiment of this application, before performing inverse Laplace transform on each of the test echo chain signals, the method further includes: performing noise reduction processing on each of the test echo chain signals to improve the signal-to-noise ratio.

[0011] In one embodiment of this application, the strength of each of the test magnetic fields in the test magnetic field strength group is not greater than a preset magnetic field strength threshold.

[0012] Secondly, this application provides a transformer oil deterioration detection device, disposed on a transformer oil circulation pipeline, comprising an RF shielding box enclosing at least a portion of the transformer oil circulation pipeline, and a magnetic field transmitter, an RF transceiver coil, a coil control component, and a communicator sealed inside the RF shielding box: the magnetic field transmitter is disposed outside the transformer oil circulation pipeline and is used to generate corresponding magnetic fields based on preset test magnetic field strengths; the RF transceiver coil is located between the magnetic field transmitter and the transformer oil circulation pipeline, and surrounds the transformer oil circulation pipeline, and is used to transmit test RF magnetic field pulse sequences corresponding to each of the test magnetic field strengths, and receive corresponding test echo chain signals; the coil control component is connected to the RF transceiver coil and is used to control the RF transceiver coil to transmit each of the test RF magnetic field pulse sequences or receive each of the test echo chain signals; the communicator is connected to the coil control component and is used to acquire each of the test echo chain signals and send them to an external processor.

[0013] In one embodiment of this application, the magnetic field emitter includes a permanent magnet and an electromagnetic coil.

[0014] In one embodiment of this application, the coil control component includes: a spectrometer controller, communicatively connected to the communicator, for generating radio frequency power at corresponding frequencies based on the strength of each of the test magnetic fields, and receiving and transmitting test echo chain signals from the radio frequency transceiver coil to the communicator; a radio frequency power amplifier, connected to the spectrometer controller, for receiving and amplifying the radio frequency power and transmitting it to the radio frequency transceiver coil; a low-noise amplifier, connected to the spectrometer controller, for amplifying and transmitting the test echo chain signals received by the radio frequency transceiver coil to the spectrometer controller; a radio frequency switch, a double-throw switch, one end of which is connected to the radio frequency transceiver coil, and the other end of which is connected to the radio frequency power amplifier when the radio frequency transceiver coil transmits the test radio frequency magnetic field pulse sequence, and the other end of which is connected to the low-noise amplifier when the radio frequency transceiver coil receives the test echo chain signals; and a tuning matching unit, connected between the radio frequency switch and the radio frequency transceiver coil, for impedance matching and resonant frequency adjustment of the radio frequency transceiver coil.

[0015] Thirdly, this application provides a terminal, including: a processor and a memory, wherein the memory and the processor are communicatively connected;

[0016] The memory is used to store computer programs, and the processor is used to execute the computer programs stored in the memory so that the terminal performs the transformer oil deterioration detection method as described above.

[0017] Fourthly, this application provides a computer storage medium storing a computer program, which, when executed by a processor, implements the transformer oil deterioration detection method as described above.

[0018] As described above, this application provides a method, apparatus, terminal, and computer storage medium for detecting transformer oil deterioration. By transmitting various test radio frequency magnetic field pulse sequences, based on the principle of nuclear magnetic resonance, the deterioration status of transformer oil in the transformer circulation pipeline is obtained, and the detection results are fed back in real time. This enables timely replacement of transformer oil, maintains the safe and stable operation of the transformer, and eliminates the need for manual operation, avoiding the introduction of human operation errors and further improving the accuracy of transformer oil detection results. Attached Figure Description

[0019] Figure 1 The diagram shown is a structural schematic of the transformer device in an embodiment of this application.

[0020] Figure 2 The diagram shown is a structural schematic of a transformer oil deterioration detection device according to an embodiment of this application.

[0021] Figure 3 The diagram shown is a flowchart illustrating a transformer oil deterioration detection method according to an embodiment of this application.

[0022] Figure 4 The diagram shown is a flowchart illustrating a method for acquiring test echo chain signals according to an embodiment of this application.

[0023] Figure 5 The diagram shown is a schematic representation of the transmission of a test radio frequency magnetic field pulse sequence as described in an embodiment of this application.

[0024] Figure 6 The diagram shown is a flowchart illustrating an offset value acquisition method according to an embodiment of this application.

[0025] Figure 7 The diagram shows the offset of a test transverse relaxation time distribution spectrum relative to a reference transverse relaxation time distribution spectrum as described in an embodiment of this application.

[0026] Figure 8 The diagram shown is a structural schematic of a terminal as described in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures

[0028] 10: Transformer unit; 11: Transformer body; 12: Transformer oil circulation pipeline; 20: Transformer oil deterioration detection device; 21: RF shielding box; 22: Magnetic field transmitter; 23: RF transceiver coil; 24: Coil control assembly; 241: Spectrometer controller; 242: RF power amplifier; 243: Low noise amplifier; 244: RF switch; 245: Tuning matching unit; 25: Communicator; 30: Terminal; 31: Processor; 32: Memory; 321: Operating system; 322: Application program; 33: User interface; 34: Network interface; 35: Bus system Detailed Implementation

[0029] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] Existing methods for testing transformer oil typically require sampling the transformer oil before offline monitoring. This not only results in a time lag and prevents real-time feedback, but also introduces human error during the sampling and delivery process, affecting the accuracy of the test results.

[0032] To address the technical problems existing in the prior art, the following embodiments of this application provide a method, device, terminal, and computer storage medium for detecting transformer oil deterioration. The method utilizes nuclear magnetic resonance to perform online detection of transformer oil in the transformer oil circulation pipeline and provides real-time feedback of the detection results. It is simple to operate, reduces the impact of human error on the detection results, and improves the timeliness, accuracy, and convenience of the detection results, thereby achieving excellent transformer oil detection results.

[0033] The following embodiments of this application provide a method, apparatus, terminal, and computer storage medium for detecting transformer oil deterioration, including but not limited to applications for detecting changes in the composition and content of each component of transformer oil during use. The following description will take the real-time detection of transformer oil in the transformer oil circulation pipeline as an example.

[0034] like Figure 1 As shown, to facilitate understanding of this application by those skilled in the art, this embodiment exemplarily provides a transformer device 10, including: a transformer body 11 and a transformer oil circulation pipeline 12. The transformer body 11 is used to realize its transformer function in the power system. The transformer oil circulation pipeline 12 is electrically connected to the inside of the transformer body 11 and is used to circulate and transport transformer oil to achieve safe and stable operation inside the transformer body 11. Since transformer oil gradually deteriorates and its insulation performance decreases during use, in order to replace the deteriorated transformer oil in a timely manner to ensure the normal use of the transformer body 11, this embodiment provides a transformer oil deterioration detection method, which uses a transformer oil deterioration detection device 20 installed on the transformer oil circulation pipeline 12 to perform real-time detection of the transformer oil in the transformer oil circulation pipeline 12.

[0035] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0036] like Figure 2 As shown, this embodiment provides a transformer oil deterioration detection device 20, which is installed on the transformer oil circulation pipe 12 to detect the deterioration of transformer oil. Specifically, as... Figure 2 As shown, the transformer oil deterioration detection device 20 includes an RF shielding box 21 that encloses at least part of the transformer oil circulation pipeline 12, and a magnetic field transmitter 22, an RF transceiver coil 23, a coil control assembly 24, and a communicator 25 that are sealed inside the RF shielding box 21.

[0037] Among them, the radio frequency shielding box 21 is used to shield signals, prevent radio frequency signal leakage, and avoid external signal interference.

[0038] A magnetic field transmitter 22 is disposed outside the transformer oil circulation pipeline 12 and is used to generate corresponding magnetic fields based on preset test magnetic field strengths. Exemplarily, the magnetic field transmitter 22 includes a permanent magnet and an electromagnetic coil for generating a magnetic field of variable strength.

[0039] The radio frequency transceiver coil 23 is located between the magnetic field transmitter 22 and the transformer oil circulation pipeline 12, and surrounds the transformer oil circulation pipeline 12. It is used to transmit test radio frequency magnetic field pulse sequences corresponding to each test magnetic field strength, and to receive corresponding test echo chain signals. It should be noted that different components in the transformer oil will generate different echo signals under the action of the test radio frequency magnetic field pulse sequences. These echo signals form test echo chain signals. By analyzing the composition of the transformer oil through the received test echo chain signals, the degradation status of the transformer oil can be determined. For example, each test echo chain signal is converted into a corresponding test transverse relaxation time distribution spectrum using the inverse Laplace method. Based on the position and area of ​​each spectral peak in the test transverse relaxation time distribution spectrum, the composition of the transformer oil is analyzed, thereby obtaining the degradation status of the transformer oil. Specifically, the position of each spectral peak represents the component in the transformer oil, and the area represents the content of the corresponding component.

[0040] Furthermore, to facilitate analysis, this embodiment uses the transverse relaxation time distribution spectrum of unused transformer oil as the benchmark transverse relaxation time distribution spectrum and compares it with the test transverse relaxation time distribution spectrum of transformer oil in the current transformer oil circulation pipeline 12, thereby more intuitively reflecting the deterioration of transformer oil.

[0041] The coil control assembly 24 is connected to the RF transceiver coil 23 and is used to control the RF transceiver coil 23 to transmit various test RF magnetic field pulse sequences or receive various test echo train signals. Exemplarily, the coil control assembly 24 includes: a spectrometer controller 241, an RF power amplifier 242, a low-noise amplifier 243, an RF switch 244, and a tuning matching unit 245, which are interconnected.

[0042] The spectrometer controller 241 is communicatively connected to the communicator 25. It generates radio frequency (RF) power at corresponding frequencies based on the strength of each test magnetic field and receives test echo train signals from the RF transceiver coil 23, transmitting them to the communicator 25. The RF power amplifier 242 is connected to the spectrometer controller 241, receiving and amplifying the RF power before transmitting it to the RF transceiver coil 23. The low-noise amplifier 243 is also connected to the spectrometer controller 241, amplifying the test echo train signals received by the RF transceiver coil 23 and transmitting them to the spectrometer controller 241. The RF switch 244 is a double-throw switch. One end is connected to the RF transceiver coil 23. When the RF transceiver coil 23 transmits test RF magnetic field pulse sequences, the other end is connected to the RF power amplifier 242. When the RF transceiver coil 23 receives test echo train signals, the other end is connected to the low-noise amplifier 243. Thus, the RF power amplifier 242 and the low-noise amplifier 243 respectively enable the transmission and reception of each test RF signal. The tuning matching unit 245 is connected between the RF switch 244 and the RF transceiver coil 23, and is used to perform impedance matching and resonant frequency adjustment on the RF transceiver coil 23.

[0043] The communicator 25 is connected to the coil control component 24 and is used to acquire each test echo chain signal and send it to an external processor. This allows the external processor to detect the deterioration of the transformer oil based on the transformer oil deterioration detection method described above. Specifically, it calculates the corresponding transverse relaxation time distribution spectrum based on each test echo chain signal and obtains the degree of deterioration of the transformer oil in the transformer oil circulation pipeline based on the transverse relaxation time distribution spectrum. For example, the communicator 25 is a wireless communication device.

[0044] On the other hand, such as Figure 3 As shown, this embodiment also provides a method for detecting transformer oil deterioration, which can be applied to a transformer oil deterioration detection device 20 installed on the transformer oil circulation pipeline 12. Specifically, it includes:

[0045] S100 generates a test magnetic field based on a preset test magnetic field strength group, and transmits corresponding test radio frequency magnetic field pulse sequences to the transformer oil to be tested, thereby acquiring corresponding test echo chain signals.

[0046] Specifically, the radio frequency transceiver coil 23 transmits a sequence of test radio frequency magnetic field pulses to the transformer oil circulation pipeline 12, so as to generate an echo signal in the transformer oil in the transformer oil circulation pipeline 12, thereby forming an echo chain signal.

[0047] The test magnetic field strength group includes at least one test magnetic field strength, and each test echo chain signal corresponds one-to-one with each test magnetic field strength. Preferably, the test magnetic field strength group includes multiple test magnetic field strengths to generate multiple test radio frequency magnetic field pulse sequences based on these test magnetic field strengths, thereby obtaining multiple test echo chain signals. This facilitates subsequent analysis of transformer oil degradation based on these test echo chain signals, thereby improving the accuracy of transformer oil detection results.

[0048] For example, the strength of each test magnetic field in the test magnetic field strength group is not greater than a preset magnetic field strength threshold, so that the transformer oil deterioration detection device 20 used in this embodiment has a small volume, ensuring that the transformer oil deterioration detection method of this embodiment can be applied to practical application scenarios. For example, the magnetic field strength threshold is 0.1T.

[0049] Each test RF magnetic field pulse sequence consists of several test RF magnetic field pulses. Each test RF magnetic field pulse is used to excite protons in the transformer oil to undergo transitions or to refocus the magnetization vector of the protons to generate an echo signal. Each test RF magnetic field pulse in the test RF magnetic field pulse sequence has the same frequency, the magnitude of which is determined by the corresponding test magnetic field strength.

[0050] For example, the frequency of each test radio frequency magnetic field pulse is f L =γB, where, f L To test the frequency of each test radio frequency magnetic field pulse in the radio frequency magnetic field pulse sequence, γ is the proton gyrometry ratio, for example, γ = 42.576MHz / T, and B is the test magnetic field strength corresponding to the test radio frequency magnetic field pulse sequence.

[0051] Specifically, for any test magnetic field strength in the test magnetic field strength group, the corresponding pulse frequency is calculated and obtained, and corresponding test radio frequency magnetic field pulses are generated based on the pulse frequency. These test radio frequency magnetic field pulses are arranged in a preset order to form a test radio frequency magnetic field pulse sequence. Each test radio frequency magnetic field pulse in the test radio frequency magnetic field pulse sequence is transmitted to the transformer oil circulation pipeline 12 in the order of arrangement, so that the transformer oil in the transformer oil circulation pipeline 12 undergoes nuclear magnetic resonance. The echo signal corresponding to each generated test radio frequency magnetic field pulse is received to obtain the corresponding test echo chain signal.

[0052] In some optional embodiments, the test radio frequency magnetic field pulse sequence consists of an excitation radio frequency magnetic field pulse, a first refocusing radio frequency magnetic field pulse, and a second refocusing radio frequency magnetic field pulse arranged in a preset order. The excitation radio frequency magnetic field pulse is used to excite proton transitions in the transformer oil, and the first and second refocusing radio frequency magnetic field pulses are used to refocus the magnetization vector of the protons to generate an echo signal. Based on this, as... Figure 4As shown, the implementation method for obtaining the corresponding test echo train signal for any of the test magnetic field strengths in the test magnetic field strength group includes:

[0053] S101, based on the test magnetic field strength, calculate the corresponding pulse frequency; based on the pulse frequency, generate the excitation radio frequency magnetic field pulse, the first refocusing radio frequency magnetic field pulse, and the second refocusing radio frequency magnetic field pulse.

[0054] Among them, the excitation radio frequency magnetic field pulse is a π / 2 radio frequency magnetic field pulse, that is, a radio frequency magnetic field pulse with a flip angle of π / 2; the first refocusing radio frequency magnetic field pulse is a π radio frequency magnetic field pulse, and the second refocusing radio frequency magnetic field pulse is a -π radio frequency magnetic field pulse, that is, the flip angle of the first refocusing radio frequency magnetic field pulse and the second refocusing radio frequency magnetic field pulse is π, and the phase of the first refocusing radio frequency magnetic field pulse and the second refocusing radio frequency magnetic field pulse is reversed.

[0055] It should be noted that the calculation method for pulse frequency is described in the foregoing content, and will not be repeated here in this embodiment.

[0056] S102, based on the pulse frequency, transmits a corresponding excitation radio frequency magnetic field pulse to the transformer oil; and after half the echo time, transmits a refocusing radio frequency magnetic field pulse and receives the echo signal radiated by the transformer oil.

[0057] Specifically, the RF switch 244 is first connected to the RF power amplifier 242 to send an excitation RF magnetic field pulse to the transformer oil in the transformer oil circulation pipeline. After half of the echo time, it sends a refocusing RF magnetic field pulse to the transformer oil in the transformer oil circulation pipeline again, and switches the RF switch 244 to be connected to the low noise amplifier 243 to receive the echo signal radiated by the transformer oil.

[0058] The echo time is used to characterize the time required from the emission of the radio frequency magnetic field pulse to the peak of the echo. Specifically, those skilled in the art should know the specific setting method of the echo time, which will not be specifically explained in this embodiment.

[0059] The refocusing radio frequency magnetic field pulse is used to refocus the magnetization vector of the proton to generate an echo signal. Specifically, the refocusing radio frequency magnetic field pulse is either a first refocusing radio frequency magnetic field pulse or a second refocusing radio frequency magnetic field pulse.

[0060] Based on the pulse frequency, a corresponding excitation radio frequency magnetic field pulse is generated. This pulse is applied to the transformer oil, causing the protons in the oil to transition from the ground state to the excited state. It should be noted that after half the echo time, the transverse magnetic moments of the transformer oil protons become dephased. At this point, a refocusing radio frequency magnetic field pulse is emitted into the transformer oil circulation pipeline, causing the transverse magnetic moments of all protons in the oil to flip phase by π, refocus, and then gradually dephased again, thus generating an echo signal. It should be noted that the reception time of this echo signal is from the end of the refocusing radio frequency magnetic field pulse until the transmission of the next pulse.

[0061] S103, obtain the current total number of echoes; after the previous refocusing radio frequency magnetic field pulse is transmitted for one echo time, retransmit the refocusing radio frequency magnetic field pulse and receive the echo signal radiated by the transformer oil in the transformer oil circulation pipeline; if the current total number of echoes is not less than the preset number of echoes to be collected, obtain the test echo chain signal based on each received echo signal; otherwise, increment the current total number of echoes to obtain a new current total number of echoes, and retransmit the refocusing radio frequency magnetic field pulse to receive the echo signal.

[0062] The current total number of echoes is the total number of echo signals received. It should be noted that in step S103, the echo signal reception process is a cyclic process. The initial value of the current total number of echoes is set to 1, which is used to represent the echo signals received in step S102. This value is incremented in each cycle of step S103. Specifically, after each cycle of step S103, the current total number of echoes is incremented by 1 to obtain the new current total number of echoes.

[0063] The number of echo acquisitions is the total number of echo signals in the test echo train signal. Specifically, those skilled in the art can set the corresponding number of echo acquisitions according to actual needs, and this embodiment does not impose specific limitations here.

[0064] If the current total number of echoes is not less than the number of echoes acquired, then the number of received echo signals is sufficient to construct a test echo chain signal, and the transmission of refocusing radio frequency magnetic field pulses is stopped; otherwise, step S103 is repeated to obtain new echo signals.

[0065] It should be noted that, since the duration of the echo signal generated by protons in transformer oil under the action of the refocusing radio frequency magnetic field pulse is usually one echo time, the transmission time interval between two refocusing radio frequency magnetic field pulses is one echo time. This is to ensure that the echo signal can be received completely.

[0066] Based on this, this embodiment acquires multiple echo signals by transmitting an excitation radio frequency magnetic field pulse and each refocusing radio frequency magnetic field pulse. A test echo chain signal is then constructed based on the received echo signals to obtain the test echo chain signal corresponding to the test magnetic field strength. The test radio frequency magnetic field pulse sequence corresponding to the test magnetic field strength consists of the excitation radio frequency magnetic field pulse and each refocusing radio frequency magnetic field pulse.

[0067] In some alternative implementations, such as Figure 5 As shown, the test radio frequency magnetic field pulse sequence consists of an excitation radio frequency magnetic field pulse and alternately emitted first and second refocusing radio frequency magnetic field pulses. Specifically, each refocusing radio frequency magnetic field pulse in steps S102 and S103 is an alternately emitted first and second refocusing radio frequency magnetic field pulse. That is, if the refocusing radio frequency magnetic field pulse in step S102 is the first refocusing radio frequency magnetic field pulse, then the refocusing radio frequency magnetic field pulse in the first execution of step S103 is the second refocusing radio frequency magnetic field pulse, and the first and second refocusing radio frequency magnetic field pulses are alternately emitted in subsequent executions. If the refocusing radio frequency magnetic field pulse in step S102 is the second refocusing radio frequency magnetic field pulse, then the refocusing radio frequency magnetic field pulse in the first execution of step S103 is the first refocusing radio frequency magnetic field pulse, and the second and first refocusing radio frequency magnetic field pulses are alternately emitted in subsequent executions. By alternately emitting the first and second refocusing radio frequency magnetic field pulses, Meiboom-Gill compensation is performed to self-cancel the phase error, thereby obtaining a more accurate test echo train signal.

[0068] S200 performs inverse Laplace transform on each test echo train signal to calculate the corresponding transverse relaxation time distribution spectrum.

[0069] The transverse relaxation time distribution spectra of each test are used to characterize the transverse relaxation time distribution of different components in the current transformer oil. The transverse relaxation time is used to characterize the time required for the spin system of the atomic nuclei in the transformer oil to decay to 37% of its initial value (1 / e) in the transverse direction, i.e., the direction perpendicular to the magnetic field. Based on these transverse relaxation time distribution spectra, the composition of the transformer oil and the changes in the content of each component can be reflected.

[0070] It should be noted that those skilled in the art should know the specific execution method of obtaining the test transverse relaxation time distribution spectrum by performing inverse Laplace transform based on the test echo chain signal, and this embodiment will not be specifically explained here.

[0071] S300, obtain the reference transverse relaxation time distribution spectrum corresponding to each test transverse relaxation time distribution spectrum; calculate the offset value of each test transverse relaxation time distribution spectrum relative to the corresponding reference transverse relaxation time distribution spectrum, and obtain the degree of deterioration of transformer oil in transformer oil circulation pipeline based on each offset value.

[0072] The reference transverse relaxation time distribution spectra are used to characterize the transverse relaxation time distribution when the transformer oil has not deteriorated. The corresponding test transverse relaxation time distribution spectra and reference transverse relaxation time distribution spectra are transverse relaxation time distribution spectra obtained by nuclear magnetic resonance under the same magnetic field strength.

[0073] The reference transverse relaxation time distribution spectrum is a pre-acquired transverse relaxation time distribution spectrum. For example, the method for obtaining the reference transverse relaxation time distribution spectrum is as follows: A radio frequency magnetic field pulse sequence corresponding to each test magnetic field strength is emitted to unused transformer oil to obtain the corresponding echo chain signals. Then, an inverse Laplace transform is used to obtain the reference transverse relaxation time distribution spectrum based on each echo chain signal. Specifically, the method for obtaining the reference transverse relaxation time distribution spectrum is described above, and will not be repeated here.

[0074] The offset value characterizes the degree of deviation of each tested transverse relaxation time distribution spectrum from the corresponding reference transverse relaxation time distribution spectrum. It should be noted that since the transverse relaxation time distribution spectrum reveals the transverse relaxation time distribution of different components in the transformer oil, the degree of deviation of the tested transverse relaxation time distribution spectrum from the corresponding reference transverse relaxation time distribution spectrum can be used to obtain the compositional changes of the current transformer oil relative to its state before deterioration. Specifically, the larger the deviation value, the more severe the deterioration.

[0075] Furthermore, to monitor whether the transformer oil's degradation level exceeds the normal range and to replace the transformer oil in a timely manner, an offset threshold is set. If the offset value is greater than the offset threshold, the degradation level of the transformer oil in the transformer oil circulation pipeline exceeds the normal operating range of the transformer oil. The transformer oil degradation detection device 20 triggers a response operation, such as issuing an alarm, to remind the user to replace the transformer oil in a timely manner and ensure the safe and stable operation of the transformer. The offset threshold is used to characterize the maximum degradation level of the transformer oil within its normal operating range. Specifically, those skilled in the art can set specific offset thresholds according to the actual needs of various types of transformer oil; this embodiment does not impose specific limitations.

[0076] It should be noted that when the test magnetic field strength group includes multiple test magnetic field strengths, the corresponding transverse relaxation time distribution spectrum also includes multiple values, thus yielding multiple offset values. Based on this, when monitoring whether the degree of transformer oil deterioration exceeds the normal range, if any of these offset values ​​is greater than the offset threshold, the degree of transformer oil deterioration in the transformer oil circulation pipeline exceeds the normal operating range, and the transformer oil deterioration detection device will issue an alarm. Monitoring based on multiple offset values ​​avoids random errors, thereby improving the accuracy of transformer oil detection results.

[0077] In some alternative implementations, such as Figure 6 As shown, the methods for obtaining each offset value include:

[0078] S301, obtain the position and area of ​​each test spectral peak based on the test transverse relaxation time distribution spectrum, and obtain the position and area of ​​each reference spectral peak based on the reference transverse relaxation time distribution spectrum.

[0079] In this diagram, each test spectral peak represents a peak in the test transverse relaxation time distribution spectrum, while each reference spectral peak represents a peak in the reference transverse relaxation time distribution spectrum. It should be noted that each peak in the transverse relaxation time distribution spectrum corresponds to a specific component in the transformer oil, and the area of ​​this peak is proportional to the relative content of that component in the transformer oil. Based on this, the deterioration status of the transformer oil can be obtained by analyzing the shift of each test spectral peak relative to each reference spectral peak.

[0080] For example, please see Figure 7 The dashed line shows a test transverse relaxation time distribution spectrum, and the solid line shows a reference transverse relaxation time distribution spectrum. It can be seen that the positions of the two test peaks of the test transverse relaxation time distribution spectrum are 1.9ms and 245ms, and the areas are 4.94 and 3.64, respectively. The positions of the two reference peaks of the reference transverse relaxation time distribution spectrum are 1ms and 155ms, and the areas are 17.09 and 16.23, respectively.

[0081] S302, Match each test spectral peak with each reference spectral peak; if a matching reference spectral peak exists for the test spectral peak, calculate the position offset and area change value of the test spectral peak relative to the corresponding reference spectral peak; otherwise, calculate the area value of the test spectral peak.

[0082] Specifically, if the positions of the peaks in the transverse relaxation time spectrum shift, it indicates that the component corresponding to that peak has deteriorated. The greater the shift, the more severe the deterioration. If the area of ​​each peak changes, it indicates that the content of the component corresponding to that peak has changed. The greater the area change, the greater the content change. If a new peak is generated in the transverse relaxation time spectrum, it indicates that a new substance has appeared in the transformer oil. The larger the area of ​​the new peak, the more new substances are generated.

[0083] Based on this, each test peak is matched with each reference peak according to its position. The changes in the position and area of ​​the matched peaks reflect the changes in the content and deterioration of each component in the transformer oil. The area of ​​the mismatched test peaks reflects the amount of newly formed substances in the transformer oil, thereby obtaining the deterioration status of the transformer oil.

[0084] S303, perform a weighted summation of the offset values ​​at each location, the change values ​​of each area, and the area values, and use the weighted summation value as the offset value.

[0085] Specifically, since the different components in transformer oil have varying degrees of influence on transformer performance, the weights corresponding to the positions and areas of each spectral peak are set based on actual conditions to better reflect the deterioration of the transformer oil. It should be noted that those skilled in the art should set the weights based on actual conditions; this embodiment does not impose specific limitations.

[0086] Furthermore, the weight of each area value is greater than the weight of each position offset value and each area change value. This is because new substances are generated in the transformer oil, which usually have a significant impact on the performance of the transformer oil. Based on this, the weight of each test peak that does not match any of the reference peaks is greater.

[0087] For example, if each test spectral peak corresponds one-to-one with each reference spectral peak, the offset value is calculated as follows:

[0088]

[0089] Where M is the total number of test spectral peaks, k m h represents the weight corresponding to the position offset of the m-th test spectral peak. m F represents the weight corresponding to the area change of the m-th test spectral peak. m F represents the position of the m-th test spectral peak in the transverse relaxation time distribution spectrum. 0,m S represents the position of the m-th reference spectral peak in the reference transverse relaxation time distribution spectrum. m S represents the area of ​​the m-th test spectral peak in the transverse relaxation time distribution spectrum. 0,m The area of ​​the m-th reference peak in the reference transverse relaxation time distribution spectrum.

[0090] It should be noted that, in order to avoid the impact of noise on the accuracy of subsequent tests, noise reduction processing is required for each test echo chain signal before converting it into the transverse relaxation time distribution spectrum of each test echo chain signal through inverse Laplace transform.

[0091] In some alternative implementations, the noise reduction of a single test echo chain signal is performed by an attention mechanism, in which the encoder maps the input data to a representation in the latent space, the decoder maps the representation output by the encoder back to the original input space, and the test echo chain signal is extracted by an attention mechanism.

[0092] Specifically, the encoder is a multi-scale feature extraction encoder that employs a four-level symmetric convolutional downsampling module to extract and encode multi-scale features. The decoder employs a four-level deconvolutional upsampling module and uses a single-layer convolutional operation to achieve feature channel fusion. A feature fusion skip connection bridge is also included between the multi-scale feature extraction encoder and decoder, employing a channel attention mechanism to extract non-noise signals through weighted sampling for noise reduction, achieving good results.

[0093] Based on the same technical concept, the transformer oil deterioration detection method provided in this embodiment of the invention can be implemented on the terminal side or the server side.

[0094] like Figure 8 The diagram shown illustrates an optional hardware structure of a terminal according to an embodiment of the present invention. The terminal 30 can be a mobile phone, computer device, tablet device, personal digital processing device, factory back-end processing device, etc. The terminal 30 includes at least one processor 31, a memory 32, at least one network interface 34, and a user interface 33. The various components in the device are coupled together via a bus system 35. It is understood that the bus system 35 is used to realize communication between these components. In addition to a data bus, the bus system 35 also includes a power bus, a control bus, and a status signal bus.

[0095] The user interface 33 may include a monitor, keyboard, mouse, trackball, clicker, button, touchpad, or touch screen.

[0096] It is understood that memory 32 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be read-only memory (ROM) or programmable read-only memory (PROM), used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM) and synchronous static random access memory (SSRAM). The memory characterized in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable categories of memory.

[0097] In this embodiment of the invention, the memory 32 is used to store various types of data to support the operation of the terminal. Examples of this data include: any executable program for operation on the terminal 30, such as the operating system 321 and application programs 322; the operating system 321 contains various system programs, such as the framework layer, core library layer, driver layer, etc., for implementing various basic services and handling hardware-based tasks. The application program 322 may contain various applications, such as media players, browsers, etc., for implementing various application services. The transformer oil deterioration detection method provided in this embodiment of the invention can be included in the application program 322.

[0098] The methods disclosed in the above embodiments of the present invention can be applied to processor 31, or implemented by processor 31. Processor 31 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 31 or by instructions in the form of software. The processor mentioned above may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 31 can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present invention. Processor 31 may be a microprocessor or any conventional processor, etc. The steps of the accessory optimization method provided in the embodiments of the present invention can be directly reflected as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, which is located in memory. The processor reads the information in the memory and combines it with its hardware to complete the steps of the aforementioned method.

[0099] In an exemplary embodiment, terminal 30 may be used by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), or complex programmable logic devices (CPLDs) to execute the aforementioned method.

[0100] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when called by a processor, implements the transformer oil deterioration detection method provided by this invention.

[0101] A computer-readable storage medium can be a tangible device capable of holding and storing instructions used by an instruction execution device. Computer-readable storage media can be, for example, (but not limited to) electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, and mechanical encoding devices.

[0102] The computer-readable program represented herein can be downloaded from a computer-readable storage medium to various computing / processing devices, or downloaded via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network, to an external computer or external storage device. A network adapter card or network interface in each computing / processing device receives computer-readable program instructions from the network and forwards these instructions to the computer-readable storage medium in the respective computing / processing device.

[0103] In summary, this application utilizes nuclear magnetic resonance to perform online detection of transformer oil in the transformer oil circulation pipeline, thereby enabling real-time monitoring of transformer oil deterioration and facilitating timely replacement of the transformer oil. This provides effective assurance for the safe and stable operation of transformers and has high industrial application value.

[0104] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0105] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for detecting transformer oil deterioration, comprising: A test magnetic field is generated based on a preset test magnetic field strength group to transmit corresponding test radio frequency magnetic field pulse sequences to the transformer oil to be tested, and to obtain corresponding test echo chain signals; the test magnetic field strength group includes at least one test magnetic field strength, and each test echo chain signal corresponds one-to-one with each test magnetic field strength. Perform inverse Laplace transform on each of the test echo train signals and calculate the corresponding transverse relaxation time distribution spectrum for each test. Obtain the reference transverse relaxation time distribution spectrum corresponding to each test transverse relaxation time distribution spectrum; calculate the offset value of each test transverse relaxation time distribution spectrum relative to the corresponding reference transverse relaxation time distribution spectrum, and obtain the degree of deterioration of the transformer oil based on each offset value.

2. The method according to claim 1, characterized in that, The test radio frequency magnetic field pulse sequence consists of an excitation radio frequency magnetic field pulse, a first refocusing radio frequency magnetic field pulse, and a second refocusing radio frequency magnetic field pulse arranged in a preset order. For any test magnetic field intensity in the test magnetic field intensity group, the corresponding test echo train signal is acquired, including: Based on the test magnetic field strength, the corresponding pulse frequency is calculated; based on the pulse frequency, the excitation radio frequency magnetic field pulse, the first refocusing radio frequency magnetic field pulse, and the second refocusing radio frequency magnetic field pulse are generated. A corresponding excitation radio frequency magnetic field pulse is emitted into the transformer oil; and after half the echo time, a refocusing radio frequency magnetic field pulse is emitted, and the echo signal radiated by the transformer oil is received. Obtain the current total number of echoes; after the previous refocusing radio frequency magnetic field pulse transmission interval of one echo time, retransmit the refocusing radio frequency magnetic field pulse and receive the echo signal radiated from the transformer oil; if the current total number of echoes is not less than the preset number of echo acquisitions, obtain the echo chain signal based on each received echo signal; otherwise, increment the current total number of echoes to obtain a new current total number of echoes, and retransmit the refocusing radio frequency magnetic field pulse to receive the echo signal; The echo time is used to characterize the time required from the emission of the radio frequency magnetic field pulse to the peak of the echo; each of the refocusing radio frequency magnetic field pulses is an alternately emitted first refocusing radio frequency magnetic field pulse and second refocusing radio frequency magnetic field pulse, and the first refocusing radio frequency magnetic field pulse and the second refocusing radio frequency magnetic field pulse are phase-reversed.

3. The method according to claim 1, characterized in that, The implementation method for calculating the offset of any of the test transverse relaxation time distribution spectra relative to the corresponding reference transverse relaxation time distribution spectra includes: The position and area of ​​each test spectral peak are obtained based on the test transverse relaxation time distribution spectrum, and the position and area of ​​each reference spectral peak are obtained based on the reference transverse relaxation time distribution spectrum. Each test spectral peak is matched with each reference spectral peak; if a matching test spectral peak exists, the position offset and area change of the test spectral peak relative to the corresponding reference spectral peak are calculated; otherwise, the area value of the test spectral peak is calculated. The position offset value, the area change value, and the area value are weighted and summed to obtain the offset value. The weight of each area value is greater than the weight of each position offset value and each area change value.

4. The method according to claim 1, characterized in that, The step of obtaining the degree of deterioration of the transformer oil in the transformer oil circulation pipeline based on each of the aforementioned offset values ​​includes: Obtain a preset offset threshold. If any of the offset values ​​is greater than the offset threshold, a response operation is triggered.

5. The method according to claim 1, characterized in that, Before performing the inverse Laplace transform on each of the test echo chain signals, the method further includes: performing noise reduction processing on each of the test echo chain signals to improve the signal-to-noise ratio.

6. The method according to claim 1, characterized in that, The strength of each test magnetic field in the test magnetic field strength group is not greater than the preset magnetic field strength threshold.

7. A transformer oil deterioration detection device, installed on a transformer oil circulation pipeline, characterized in that, This includes an RF shielding box that encloses at least a portion of the transformer oil circulation pipeline, and a magnetic field transmitter, RF transceiver coil, coil control assembly, and communicator enclosed within the RF shielding box. The magnetic field transmitter is located outside the transformer oil circulation pipeline and is used to generate corresponding magnetic fields based on preset test magnetic field strengths. The radio frequency transceiver coil is located between the magnetic field transmitter and the transformer oil circulation pipeline, and surrounds the transformer oil circulation pipeline. It is used to transmit each test radio frequency magnetic field pulse sequence corresponding to each test magnetic field strength, and to receive each corresponding test echo chain signal. The coil control component is connected to the radio frequency transceiver coil and is used to control the radio frequency transceiver coil to transmit each of the test radio frequency magnetic field pulse sequences or receive each of the test echo chain signals. The communicator is connected to the coil control component and is used to acquire each of the test echo train signals and send them to an external processor.

8. The apparatus according to claim 7, characterized in that, The magnetic field emitter includes a permanent magnet and an electromagnetic coil.

9. The apparatus according to claim 7, characterized in that, The coil control component includes: The spectrometer controller is communicatively connected to the communicator and is used to generate radio frequency power of corresponding frequencies based on the strength of each of the test magnetic fields, and to receive each of the test echo chain signals from the radio frequency transceiver coils and send them to the communicator. A radio frequency power amplifier, connected to the spectrometer controller, is used to receive each radio frequency power and amplify and transmit it to the radio frequency transceiver coil; A low-noise amplifier, connected to the spectrometer controller, is used to amplify and transmit the test echo train signals received by the radio frequency transceiver coil to the spectrometer controller. The radio frequency switch is a double-throw switch. One end is connected to the radio frequency transceiver coil. When the radio frequency transceiver coil transmits each of the test radio frequency magnetic field pulse sequences, the other end is connected to the radio frequency power amplifier. When the radio frequency transceiver coil receives each of the test echo chain signals, the other end is connected to the low noise amplifier. A tuning matching unit is connected between the RF switch and the RF transceiver coil, and is used to perform impedance matching and resonant frequency adjustment of the RF transceiver coil.

10. A terminal, characterized in that, include: A processor and a memory, wherein the memory and the processor are communicatively connected; The memory is used to store computer programs, and the processor is used to execute the computer programs stored in the memory, so that the terminal performs the transformer oil deterioration detection method as described in any one of claims 1 to 6.

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