Transformer winding strain monitoring method, device and system and computer equipment

Abstract

The invention relates to a transformer winding strain monitoring method, device and system and computer equipment. The method comprises the following steps: when a to-be-detected optical fiber of an optical frequency domain reflection system detects strain of a transformer winding, receiving an electric signal carrying strain information; the electric signal is obtained by carrying out photoelectric conversion on a collected beat frequency interference optical signal by the optical frequency domain reflection system; the optical fiber to be measured is distributed on the surface of the transformer winding; performing frequency domain analysis based on the electric signal to obtain beat frequency indicated by the strain information; and determining a strain parameter value of the transformer winding based on the beat frequency. By adopting the method, the strain monitoring accuracy of the transformer winding can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of power transformers, and in particular to a method, device, system and computer equipment for monitoring transformer winding strain. Background Art

[0002] Power transformers are among the most critical components of power systems, significantly impacting the reliability and stability of the power grid. When a short circuit occurs externally, the current rapidly increases, generating significant electromotive force. This can cause irreversible deformation of the windings, seriously threatening the transformer's safe operation. Therefore, monitoring transformer winding strain is crucial to ensure stable operation of power transformers.

[0003] In related technologies, piezoelectric sensors are used to monitor the strain of transformer windings. Piezoelectric materials are susceptible to electromagnetic interference, and the signal is severely distorted in the strong electromagnetic field environment of the transformer, resulting in low monitoring accuracy. Summary of the Invention

[0004] Based on this, it is necessary to provide a transformer winding strain monitoring method, device, system, computer equipment, computer-readable storage medium and computer program product that can improve monitoring accuracy in response to the above technical problems.

[0005] In a first aspect, the present application provides a transformer winding strain monitoring method, comprising:

[0006] When the optical fiber under test of the optical frequency domain reflectometry system detects strain in the transformer winding, an electrical signal carrying the strain information is received; the electrical signal is obtained by the optical frequency domain reflectometry system performing photoelectric conversion on the collected beat frequency interference optical signal; the optical fiber under test is distributed on the surface of the transformer winding;

[0007] Performing frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information;

[0008] Based on the beat frequency, a strain parameter value of the transformer winding is determined.

[0009] In one embodiment, performing frequency domain analysis based on the electrical signal to obtain the beat frequency indicated by the strain information includes:

[0010] filtering a DC component and a random phase component in the electrical signal to obtain a beat frequency component in the electrical signal;

[0011] Performing Fourier transform on the beat frequency component to obtain the beat frequency indicated by the strain information.

[0012] In one embodiment, determining the strain parameter value of the transformer winding based on the beat frequency includes:

[0013] Based on the beat frequency, the strain position of the transformer winding is determined according to the following formula:

[0014]

[0015] in, is the beat frequency, is the refractive index of the optical fiber, is the sweep rate, is the speed of light, is the strain position;

[0016] Based on the strain position, a change in the reflection coefficient amplitude is determined, and based on the change in the reflection coefficient amplitude, a strain value of the transformer winding is determined.

[0017] In one embodiment, the optical frequency domain reflectometry system includes:

[0018] A laser light source, a first coupler, a second coupler, a circulator, an optical fiber to be tested, a polarization controller, a polarization beam splitter and a photodetector.

[0019] In one embodiment, the electrical signal is generated by the following steps:

[0020] The laser light source emits a laser signal, and the laser signal is divided into a reference light and a signal light by the first coupler, the reference light enters the polarization controller, and the signal light is injected into the optical fiber to be tested through the circulator;

[0021] Exciting the signal light through the optical fiber to be tested to obtain a backscattered Rayleigh signal; the backscattered Rayleigh signal returns along the circulator;

[0022] Adjusting the polarization state of the reference light by a polarization controller;

[0023] performing beat frequency interference on the returned back Rayleigh scattered signal and the adjusted reference light through the second coupler to obtain beat frequency interference light;

[0024] Separating the beat frequency interference light by the polarization beam splitter;

[0025] The separated optical signal is subjected to photoelectric conversion by the photodetector to obtain an electrical signal.

[0026] In a second aspect, the present application provides a transformer winding strain monitoring device, the device comprising:

[0027] An electrical signal receiving module, configured to receive an electrical signal carrying strain information when the optical fiber under test of the optical frequency domain reflectometer system detects strain in the transformer winding; the electrical signal is obtained by photoelectric conversion of the collected beat frequency interference optical signal by the optical frequency domain reflectometer system; the optical fiber under test is distributed on the surface of the transformer winding;

[0028] a frequency domain analysis module, configured to perform frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information;

[0029] A strain parameter value determination module is used to determine the strain parameter value of the transformer winding based on the beat frequency.

[0030] In a third aspect, the present application provides a transformer winding strain monitoring system, comprising:

[0031] A laser light source, a first coupler, a second coupler, a circulator, an optical fiber to be tested, a polarization controller, a polarization beam splitter, a photodetector, an acquisition card, and a signal processing unit, wherein:

[0032] The laser light source is used to emit a laser signal;

[0033] The first coupler is used to split the laser signal into a reference light and a signal light, the reference light enters the polarization controller, and the signal light is injected into the optical fiber to be tested through the circulator;

[0034] The optical fiber to be tested is used to excite the signal light to obtain a backscattered Rayleigh signal; the backscattered Rayleigh signal returns along the circulator;

[0035] The polarization controller is used to adjust the polarization state of the reference light;

[0036] The second coupler is used to perform beat frequency interference on the returned back Rayleigh scattered signal and the adjusted reference light to obtain beat frequency interference light;

[0037] The polarization beam splitter is used to separate the beat frequency interference light;

[0038] The photoelectric detector is used to perform photoelectric conversion on the separated optical signal to obtain an electrical signal;

[0039] The acquisition card is used to acquire the electrical signal and transmit it to the signal processing unit;

[0040] The signal processing unit is configured to perform frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information; and determine a strain parameter value of the transformer winding based on the beat frequency.

[0041] In a fourth aspect, the present application also provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the following steps when executing the computer program: when the optical fiber to be tested of the optical frequency domain reflection system detects strain in the transformer winding, an electrical signal carrying strain information is received; the electrical signal is obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference optical signal; the optical fiber to be tested is distributed on the surface of the transformer winding; frequency domain analysis is performed based on the electrical signal to obtain the beat frequency indicated by the strain information; and based on the beat frequency, the strain parameter value of the transformer winding is determined.

[0042] In a fifth aspect, the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following steps: when the optical fiber to be tested of the optical frequency domain reflection system detects strain in the transformer winding, an electrical signal carrying strain information is received; the electrical signal is obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference optical signal; the optical fiber to be tested is distributed on the surface of the transformer winding; frequency domain analysis is performed based on the electrical signal to obtain the beat frequency indicated by the strain information; and based on the beat frequency, the strain parameter value of the transformer winding is determined.

[0043] In a fifth aspect, the present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the following steps: when the optical fiber to be tested of the optical frequency domain reflection system detects strain in the transformer winding, an electrical signal carrying strain information is received; the electrical signal is obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference optical signal; the optical fiber to be tested is distributed on the surface of the transformer winding; frequency domain analysis is performed based on the electrical signal to obtain the beat frequency indicated by the strain information; and based on the beat frequency, the strain parameter value of the transformer winding is determined.

[0044] The above-mentioned transformer winding strain monitoring method, device, system, computer equipment, computer-readable storage medium and computer program product, when the optical fiber to be tested of the optical frequency domain reflection system detects strain in the transformer winding, receives an electrical signal carrying strain information. The electrical signal is obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference optical signal. The optical fiber to be tested is distributed on the surface of the transformer winding. Frequency domain analysis is performed based on the electrical signal to obtain the beat frequency indicated by the strain information. Based on the beat frequency, the strain parameter value of the transformer winding is determined. Because the optical fiber in the optical frequency domain reflection system can accurately capture the strain changes in various parts of the blade, the beat frequency is obtained by receiving the electrical signal obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference optical signal and performing frequency domain analysis. The beat frequency can accurately express the strain information of the transformer winding, and thus the strain parameter value of the transformer winding is determined based on the beat frequency, which can improve the accuracy of transformer winding strain monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 2. A diagram showing an application environment of a transformer winding strain monitoring method according to an embodiment;

[0047] Figure 2 1 is a flow chart of a transformer winding strain monitoring method according to an embodiment;

[0048] Figure 3 1 is a flow chart of an electrical signal generating step in one embodiment;

[0049] Figure 4 1 is a flow chart of a step of performing frequency domain analysis based on an electrical signal in one embodiment;

[0050] Figure 5 is a structural block diagram of a transformer winding strain monitoring device in one embodiment;

[0051] Figure 6 is a structural block diagram of a transformer winding strain monitoring system in one embodiment;

[0052] Figure 7 is a diagram of the internal structure of a computer device in one embodiment;

[0053] Figure 8 FIG. 4 is a diagram showing the internal structure of a computer device in another embodiment. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0055] The transformer winding strain monitoring method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, a computer device 102 communicates with an optical frequency domain reflectometry (OFDR) system 104 via a wired or wireless method. When the optical fiber under test of the OFDR system detects strain in the transformer winding, the computer device can receive an electrical signal carrying the strain information from the OFDR system. The electrical signal is obtained by the OFDR system through photoelectric conversion of the collected beat frequency interference optical signal. The optical fiber under test is distributed on the surface of the transformer winding. The computer device can further perform frequency domain analysis based on the electrical signal to obtain the beat frequency indicated by the strain information and determine the strain parameter value of the transformer winding based on the beat frequency.

[0056] Computer equipment refers to electronic devices capable of computing, processing, and storing data. They can be terminals or servers. Terminals include, but are not limited to, various personal computers, laptops, smartphones, tablets, drones, low-altitude aircraft, IoT devices, and portable wearable devices. IoT devices include smart speakers, smart TVs, smart air conditioners, smart car devices, and projectors. Portable wearable devices include smart watches, smart bracelets, and head-mounted devices. Head-mounted devices can include virtual reality (VR) devices, augmented reality (AR) devices, and smart glasses. Servers can be standalone physical servers, server clusters or distributed systems composed of multiple physical servers, or cloud servers providing cloud computing services.

[0057] In an exemplary embodiment, Figure 2 As shown, a transformer winding strain monitoring method is provided, which is applied to Figure 1 The computer device in the embodiment is used as an example to illustrate the method, which includes the following steps 202 to 206. Among them:

[0058] Step 202 : When the optical fiber to be tested of the optical frequency domain reflectometry system detects strain on the transformer winding, an electrical signal carrying the strain information is received; the electrical signal is obtained by the optical frequency domain reflectometry system performing photoelectric conversion on the collected beat frequency interference optical signal.

[0059] The optical fiber to be tested is distributed on the surface of the transformer winding. Distributed optical fiber sensors offer advantages such as full distribution, compact size, wide measurement range, and resistance to electromagnetic interference. The frequency domain reflectometer system includes a laser light source, a first coupler, a second coupler, a circulator, the optical fiber to be tested, a polarization controller, a polarization beam splitter, and a photodetector. Exemplarily, the first coupler can be a 99:1 coupler, and the second coupler can be a 50:50 coupler. Exemplarily, the laser light source can be a linearly swept laser light source.

[0060] Alternatively, when strain occurs in the transformer windings due to a transformer fault, the corresponding location in the optical fiber under test also experiences strain, causing changes in the Rayleigh backscattered light from the corresponding grating. These changes are detected by the OFDR system and the reference light to generate a beat frequency interference optical signal. This signal is then converted to photoelectricity and transmitted to a computer, which then calculates the strain parameter value based on the electrical signal.

[0061] Step 204: Perform frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information.

[0062] Step 206: Determine a strain parameter value of the transformer winding based on the beat frequency.

[0063] The beat frequency refers to the frequency of the beat interference optical signal. The strain parameter value refers to a parameter describing the strain condition of the transformer winding, and may specifically include at least one of a strain value and a strain position. The strain value refers to a numerical value used to describe the magnitude of the strain.

[0064] Exemplarily, after receiving an electrical signal carrying strain information, the computer device can perform frequency domain analysis based on the electrical signal. For example, it can perform Fourier transform on the electrical signal to obtain the beat frequency indicated by the strain information. The strain position can then be calibrated and the strain value calculated based on the beat frequency to determine the strain parameter value of the transformer winding.

[0065] Optionally, the computer device may directly perform frequency domain analysis on the electrical signal to obtain the beat frequency indicated by the strain information. Optionally, the computer device may pre-process the electrical signal to filter out noise signals therein, and perform frequency domain analysis on the pre-processed electrical signal to obtain the beat frequency.

[0066] For example, the computer device can be based on the beat frequency, combined with the sweep rate , fiber refractive index n and light speed c to calculate the strain position, and the strain value is calculated by phase analysis. Specifically, the computer equipment can compare the phase difference before and after deformation: ,in is the central wavelength of the laser, and the strain value can be calculated: .

[0067] Exemplarily, the computer device may also generate a strain distribution map to reflect the strain position and strain value, trigger an alarm when the strain value exceeds a threshold, and transmit the alarm wirelessly to a monitoring center.

[0068] In the above-mentioned transformer winding strain monitoring method, when the optical fiber to be tested of the optical frequency domain reflection system detects strain in the transformer winding, an electrical signal carrying strain information is received. The electrical signal is obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference light signal. The optical fiber to be tested is distributed on the surface of the transformer winding. Frequency domain analysis is performed based on the electrical signal to obtain the beat frequency indicated by the strain information. Based on the beat frequency, the strain parameter value of the transformer winding is determined. Since the optical fiber in the optical frequency domain reflection system can accurately capture the strain changes of various parts of the blade, the beat frequency is obtained by receiving the electrical signal obtained by performing photoelectric conversion on the collected beat frequency interference light signal by the optical frequency domain reflection system and performing frequency domain analysis. The beat frequency can accurately express the strain information of the transformer winding, thereby determining the strain parameter value of the transformer winding based on the beat frequency, which can improve the accuracy of transformer winding strain monitoring.

[0069] In an exemplary embodiment, Figure 3 As shown, the electrical signal is generated by the following steps:

[0070] Step 302: A laser light source emits a laser signal, and the laser signal is divided into a reference light and a signal light by a first coupler. The reference light enters a polarization controller, and the signal light is injected into the optical fiber to be tested through a circulator.

[0071] Exemplarily, the laser light source may be a linear frequency-sweep laser light source that emits frequency-sweep laser light (in the range of 1530-1560 nm) at a fixed rate (eg, 50.23 nm / s) to ensure that the signal light covers the entire length of the optical fiber to be tested.

[0072] Step 304: Excite the signal light through the optical fiber to be tested to obtain a backward Rayleigh scattered signal; the backward Rayleigh scattered signal returns along the circulator.

[0073] Specifically, when the transformer winding is strained due to a fault (such as a short circuit), the corresponding position of the optical fiber to be tested is deformed, causing the frequency, phase or amplitude of the backward Rayleigh scattered light at that location to change.

[0074] Step 306: Adjust the polarization state of the reference light using a polarization controller.

[0075] Specifically, the reference light is adjusted to orthogonal “p” polarization state and “s” polarization state by a polarization controller to suppress polarization fading.

[0076] Step 308: Perform beat frequency interference on the returned back Rayleigh scattered signal and the adjusted reference light through a second coupler to obtain beat frequency interference light.

[0077] Beat frequency interferometry refers to the phenomenon in which two light waves with different but similar frequencies (such as a reference beam and a signal beam carrying strain information) are spatially superimposed, producing interference fringes with a frequency equal to the difference between the two frequencies. Beat frequency interferometry is a form of coherent detection. The coherent superposition of the reference and signal beams enhances the useful signal, while noise (such as ambient light and thermal noise) is suppressed due to its incoherent nature, significantly improving the system's signal-to-noise ratio.

[0078] Step 310: Separate the beat frequency interference light through a polarization beam splitter.

[0079] Step 312: Perform photoelectric conversion on the separated optical signal through a photodetector to obtain an electrical signal.

[0080] Specifically, the scattered signal carrying strain information interferes with the reference light on the photosensitive surface of the photodetector, generating a beat frequency interference light signal containing strain information. The frequency of the beat frequency interference light signal is The position and magnitude of the strain are related to the amplitude. The photodetector can further convert the beat frequency interference light signal into an electrical signal, which is digitized by the acquisition card and transmitted to the processing unit.

[0081] In the above-described embodiment, the high sensitivity of beat frequency interferometry can detect micron-level deformation of transformer windings caused by short-circuit electrodynamics, enabling early warning of faults. Furthermore, the beat frequency characteristics of optical signals are immune to electromagnetic interference, making them more suitable for the complex electromagnetic environment within transformers than traditional electrical sensors (such as piezoelectric sensors). Furthermore, a single optical fiber can simultaneously monitor strain at multiple locations on the winding, providing wide coverage and eliminating blind spots, thus overcoming the limitations of traditional point sensors.

[0082] In an exemplary embodiment, Figure 4 As shown, frequency domain analysis is performed based on the electrical signal to obtain the beat frequency indicated by the strain information, including:

[0083] Step 402: Filter the DC component and the random phase component in the electrical signal to obtain the beat frequency component in the electrical signal.

[0084] Step 404: Perform Fourier transform on the beat frequency component to obtain the beat frequency indicated by the strain information.

[0085] It is understandable that if there is a reflection point at L on the optical fiber to be tested, then the time delay between the light emitted by the light source reflected from this reflection point and the other swept reference light emitted by the light source can be expressed as:

[0086]

[0087] In the formula It's the delay. Represents the effective refractive index of the optical fiber; The speed of light in a vacuum.

[0088] The expression of the light to be measured reflected back from point L is:

[0089]

[0090] In the formula is the reflection coefficient, is the light intensity amplitude of the swept-frequency light source; is the initial optical frequency of the linear swept light source; is the sweep rate of the swept light source, is the phase of the light source; the frequency difference between the test light and the reference light is the frequency of the beat signal for .

[0091] It can be seen that the electrical signal received by the computer device consists of three parts: DC component, beat frequency component, and random phase component. Among them, the DC component is , DC component , the beat frequency part is a variable that changes linearly with time, and the random phase component is the random phase, and the nonlinear variation is the phase noise.

[0092] In this embodiment, the DC component and random phase component in the electrical signal can be filtered first to obtain the beat frequency component, and then Fourier transform can be performed on it to obtain the frequency of the beat frequency signal. Since the noise is filtered out, the frequency value of the obtained beat frequency signal is more accurate.

[0093] It is understood that after obtaining the frequency value of the beat signal, the computer device can further calculate the position L of the reflection point by combining the known sweep rate of the linear swept laser light source, the refractive index of the optical fiber, and the speed of light. The signal can then be operated to obtain the strain value, thereby completing the strain demodulation of the optical fiber. The following embodiment specifically explains this process:

[0094] In an exemplary embodiment, determining a strain parameter value of a transformer winding based on a beat frequency includes:

[0095] Based on the beat frequency, the strain position of the transformer winding is determined according to the following formula:

[0096]

[0097] in, is the beat frequency, is the refractive index of the optical fiber, is the sweep rate, is the speed of light, is the strain position;

[0098] Based on the strain position, the change in the reflection coefficient amplitude is determined, and based on the change in the reflection coefficient amplitude, the strain value of the transformer winding is determined.

[0099] Specifically, when strain occurs at the optical fiber L to be tested, the optical path difference between the signal light and the reference light is (n is the refractive index of the optical fiber), corresponding to the delay .

[0100] Linear frequency variation of swept light source ( is the sweep rate) so that the two lights produce a beat frequency:

[0101]

[0102] By measuring the beat frequency , the strain position can be calculated

[0103] Furthermore, when the winding strain causes local deformation of the optical fiber, the reflection coefficient at that location The change in the amplitude of the beat frequency signal causes the change in the amplitude of the beat frequency signal. The relationship between the change in the amplitude of the reflection coefficient and the strain value can be calibrated as follows: , converted strain value.

[0104] In the above embodiment, by encoding strain information into the optical frequency difference, high-precision calculation of strain position and magnitude is achieved. At the same time, it has the advantages of anti-interference and distributed measurement, providing core technical support for real-time health monitoring of transformer windings.

[0105] It should be understood that, although the various steps in the flowcharts involved in the above embodiments are displayed in sequence according to the instructions of the arrows, these steps are not necessarily performed in sequence in the order indicated by the arrows. Unless clearly stated herein, the execution of these steps is not strictly limited in order, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of the steps or stages in other steps or other steps. It is understandable that the various steps in different embodiments can be freely combined as needed, and the various non-contradictory schemes formed by the combination all fall within the scope of protection of this application.

[0106] Based on the same inventive concept, embodiments of the present application also provide a transformer winding strain monitoring device for implementing the aforementioned transformer winding strain monitoring method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more transformer winding strain monitoring device embodiments provided below can be found in the limitations of the transformer winding strain monitoring method described above and will not be further elaborated here.

[0107] In an exemplary embodiment, Figure 5 As shown, a transformer winding strain monitoring device 500 is provided, comprising:

[0108] The electrical signal receiving module 502 is configured to receive an electrical signal carrying strain information when the optical fiber under test of the optical frequency domain reflectometer system detects strain in the transformer winding. The electrical signal is obtained by the optical frequency domain reflectometer system performing photoelectric conversion on the collected beat frequency interference optical signal. The optical fiber under test is distributed on the surface of the transformer winding.

[0109] A frequency domain analysis module 504 is configured to perform frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information;

[0110] The strain parameter value determining module 506 is configured to determine the strain parameter value of the transformer winding based on the beat frequency.

[0111] The above-mentioned transformer winding strain monitoring device receives an electrical signal carrying strain information when the optical fiber to be tested of the optical frequency domain reflection system detects strain in the transformer winding. The electrical signal is obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference optical signal. The optical fiber to be tested is distributed on the surface of the transformer winding. Frequency domain analysis is performed based on the electrical signal to obtain the beat frequency indicated by the strain information. Based on the beat frequency, the strain parameter value of the transformer winding is determined. Since the optical fiber in the optical frequency domain reflection system can accurately capture the strain changes in various parts of the blade, the beat frequency is obtained by receiving the electrical signal obtained by the optical frequency domain reflection system performing photoelectric conversion on the collected beat frequency interference optical signal and performing frequency domain analysis. The beat frequency can accurately express the strain information of the transformer winding, thereby determining the strain parameter value of the transformer winding based on the beat frequency, which can improve the accuracy of transformer winding strain monitoring.

[0112] In an exemplary embodiment, the frequency domain analysis module is further used to: filter the DC component and the random phase component in the electrical signal to obtain the beat frequency component in the electrical signal; and perform Fourier transform on the beat frequency component to obtain the beat frequency indicated by the strain information.

[0113] In an exemplary embodiment, the strain parameter value determination module is further configured to determine the strain position of the transformer winding based on the beat frequency according to the following formula:

[0114]

[0115] in, is the beat frequency, is the refractive index of the optical fiber, is the sweep rate, is the speed of light, is the strain position;

[0116] Based on the strain position, the change in the reflection coefficient amplitude is determined, and based on the change in the reflection coefficient amplitude, the strain value of the transformer winding is determined.

[0117] In an exemplary embodiment, an optical frequency domain reflectometer system includes: a laser light source, a first coupler, a second coupler, a circulator, an optical fiber to be tested, a polarization controller, a polarization beam splitter, and a photodetector.

[0118] In an exemplary embodiment, the transformer winding strain monitoring device is also used to: emit a laser signal through a laser light source, divide the laser signal into reference light and signal light through a first coupler, the reference light enters a polarization controller, and the signal light is injected into the optical fiber to be tested through a circulator; excite the signal light through the optical fiber to be tested to obtain a backward Rayleigh scattering signal; the backward Rayleigh scattering signal returns along the circulator; adjust the polarization state of the reference light through the polarization controller; perform beat frequency interference on the returned backward Rayleigh scattering signal and the adjusted reference light through a second coupler to obtain beat frequency interference light; separate the beat frequency interference light through a polarization beam splitter; and perform photoelectric conversion on the separated optical signal through a photodetector to obtain an electrical signal.

[0119] Each module in the aforementioned transformer winding strain monitoring device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0120] In an exemplary embodiment, the present application further provides a transformer winding strain monitoring system, comprising:

[0121] A laser light source, a first coupler, a second coupler, a circulator, an optical fiber to be tested, a polarization controller, a polarization beam splitter, a photodetector, an acquisition card, and a signal processing unit, wherein:

[0122] The laser light source is used to emit laser signals;

[0123] The first coupler is used to split the laser signal into reference light and signal light. The reference light enters the polarization controller, and the signal light is injected into the optical fiber to be tested through the circulator.

[0124] The optical fiber to be tested is used to excite the signal light to obtain the backscattered Rayleigh signal; the backscattered Rayleigh signal returns along the circulator;

[0125] The polarization controller is used to adjust the polarization state of the reference light;

[0126] The second coupler is used to perform beat frequency interference on the returned back Rayleigh scattered signal and the adjusted reference light to obtain beat frequency interference light;

[0127] Polarization beam splitter is used to separate the beat frequency interference light;

[0128] The photoelectric detector is used to perform photoelectric conversion on the separated optical signal to obtain an electrical signal;

[0129] The acquisition card is used to collect electrical signals and transmit them to the signal processing unit;

[0130] The signal processing unit is used to perform frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information; and determine a strain parameter value of the transformer winding based on the beat frequency.

[0131] The first coupler may be a 99:1 coupler, and the second coupler may be a 50:50 coupler.

[0132] Exemplary, reference Figure 6 , is a structural block diagram of the transformer winding strain monitoring system. The transformer winding strain monitoring system includes a laser light source, a 99:1 coupler, a 50:50 coupler, a circulator, an optical fiber to be tested, a polarization controller, a polarization beam splitter, a photodetector, an acquisition card, a wireless transmission module, and a signal processing unit. Among them, the laser light emitted by the laser light source is divided into 1% reference light and 99% signal light by the 99:1 coupler. The signal light enters the optical fiber to be tested and generates a backward Rayleigh scattered signal. After returning through the circulator, it generates beat frequency interference with the reference light in the 50:50 coupler. The interference light is converted into an electrical signal by the photodetector and transmitted to the signal processing unit through the acquisition card and wireless transmission module.

[0133] Exemplarily, the reference light is adjusted to orthogonal “p” polarization state and “s” polarization state by a polarization controller on the optical path to the 50:50 coupler to suppress polarization fading.

[0134] Exemplarily, the wireless transmission module is also used to send the collected electrical signals to a remote monitoring center in real time, thereby realizing remote monitoring of the strain state of the transformer winding.

[0135] In an exemplary embodiment, the signal processing unit is configured to filter a DC component and a random phase component in the electrical signal to obtain a beat frequency component in the electrical signal; and perform Fourier transform on the beat frequency component to obtain a beat frequency indicated by the strain information.

[0136] In an exemplary embodiment, the signal processing unit is configured to determine the strain position of the transformer winding based on the beat frequency according to the following formula:

[0137]

[0138] in, is the beat frequency, is the refractive index of the optical fiber, is the sweep rate, is the speed of light, is the strain position;

[0139] Based on the strain position, the change in the reflection coefficient amplitude is determined, and based on the change in the reflection coefficient amplitude, the strain value of the transformer winding is determined.

[0140] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 7 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a transformer winding strain monitoring method is implemented.

[0141] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 8As shown. The computer device includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless communication, and the wireless communication can be achieved via Wi-Fi, a mobile cellular network, near-field communication (NFC), or other technologies. When executed by the processor, the computer program implements a method for monitoring transformer winding strain. The display unit of the computer device is used to form a visually visible image, and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0142] Those skilled in the art will understand that Figure 7 、 Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0143] In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps of the transformer winding strain monitoring method in any of the above embodiments when executing the computer program.

[0144] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the transformer winding strain monitoring method in any of the above embodiments are implemented.

[0145] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of the transformer winding strain monitoring method in any of the above embodiments.

[0146] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0147] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0148] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0149] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A transformer winding strain monitoring method, characterized in that: The method comprises: When the optical fiber under test of the optical frequency domain reflectometry system detects strain in the transformer winding, an electrical signal carrying the strain information is received; the electrical signal is obtained by the optical frequency domain reflectometry system performing photoelectric conversion on the collected beat frequency interference optical signal; the optical fiber under test is distributed on the surface of the transformer winding; Performing frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information; Based on the beat frequency, a strain parameter value of the transformer winding is determined.

2. The method according to claim 1, characterized in that The performing frequency domain analysis based on the electrical signal to obtain the beat frequency indicated by the strain information includes: filtering a DC component and a random phase component in the electrical signal to obtain a beat frequency component in the electrical signal; Performing Fourier transform on the beat frequency component to obtain the beat frequency indicated by the strain information.

3. The method according to claim 1, characterized in that The determining of the strain parameter value of the transformer winding based on the beat frequency includes: Based on the beat frequency, the strain position of the transformer winding is determined according to the following formula: in, is the beat frequency, is the refractive index of the optical fiber, is the sweep rate, is the speed of light, is the strain position; Based on the strain position, a change in the reflection coefficient amplitude is determined, and based on the change in the reflection coefficient amplitude, a strain value of the transformer winding is determined.

4. The method according to claim 1, wherein The optical frequency domain reflectometry system comprises: A laser light source, a first coupler, a second coupler, a circulator, an optical fiber to be tested, a polarization controller, a polarization beam splitter and a photodetector.

5. The method according to claim 4, characterized in that The electrical signal is generated by the following steps: The laser light source emits a laser signal, and the laser signal is divided into a reference light and a signal light by the first coupler, the reference light enters the polarization controller, and the signal light is injected into the optical fiber to be tested through the circulator; Exciting the signal light through the optical fiber to be tested to obtain a backscattered Rayleigh signal; the backscattered Rayleigh signal returns along the circulator; Adjusting the polarization state of the reference light by a polarization controller; performing beat frequency interference on the returned back Rayleigh scattered signal and the adjusted reference light through the second coupler to obtain beat frequency interference light; Separating the beat frequency interference light by the polarization beam splitter; The separated optical signal is subjected to photoelectric conversion by the photodetector to obtain an electrical signal.

6. A transformer winding strain monitoring device, characterized in that: The device comprises: An electrical signal receiving module, configured to receive an electrical signal carrying strain information when the optical fiber under test of the optical frequency domain reflectometer system detects strain in the transformer winding; the electrical signal is obtained by photoelectric conversion of the collected beat frequency interference optical signal by the optical frequency domain reflectometer system; the optical fiber under test is distributed on the surface of the transformer winding; a frequency domain analysis module, configured to perform frequency domain analysis based on the electrical signal to obtain a beat frequency indicated by the strain information; A strain parameter value determination module is used to determine the strain parameter value of the transformer winding based on the beat frequency.

7. A transformer winding strain monitoring system, characterized in that: include: A laser light source, a first coupler, a second coupler, a circulator, an optical fiber to be tested, a polarization controller, a polarization beam splitter, a photodetector, an acquisition card, and a signal processing unit, wherein: The laser light source is used to emit a laser signal; The first coupler is used to split the laser signal into a reference light and a signal light, the reference light enters the polarization controller, and the signal light is injected into the optical fiber to be tested through the circulator; The optical fiber to be tested is used to excite the signal light to obtain a backscattered Rayleigh signal; the backscattered Rayleigh signal returns along the circulator; The polarization controller is used to adjust the polarization state of the reference light; The second coupler is used to perform beat frequency interference on the returned back Rayleigh scattered signal and the adjusted reference light to obtain beat frequency interference light; The polarization beam splitter is used to separate the beat frequency interference light; The photoelectric detector is used to perform photoelectric conversion on the separated optical signal to obtain an electrical signal; The acquisition card is used to acquire the electrical signal and transmit it to the signal processing unit; The signal processing unit is used to perform frequency domain analysis based on the electrical signal to obtain a beat frequency; and determine a strain parameter value of the transformer winding based on the beat frequency.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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