Dielectric loss factor measurement method and device, computer equipment, medium and product

Abstract

The invention relates to a dielectric loss factor measurement method and device, computer equipment, a medium and a product. The method comprises the following steps: acquiring time domain phase signals respectively corresponding to three phases of three-phase equipment; wherein the time domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling starting time and the sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same; for each phase, performing noise reduction and frequency domain conversion processing on the time domain phase signal corresponding to the phase to obtain a frequency domain phase signal corresponding to the phase; and determining a dielectric loss factor corresponding to each phase according to the frequency domain phase signals corresponding to the three phases. By adopting the method, the dielectric loss factor of the three-phase equipment can be accurately measured.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a method, apparatus, computer equipment, medium, and product for measuring dielectric loss factor. Background Technology

[0002] The dielectric loss factor is a core indicator for evaluating the insulation performance of power equipment. The higher the value, the more severe the energy loss of the insulating medium, and the higher the risk of insulation aging or defects. Currently, dielectric loss measurement for three-phase equipment often adopts the "single-channel, multi-stage measurement" mode, that is, the A, B, and C phases are measured sequentially using a single-channel dielectric loss measuring instrument.

[0003] Existing multi-channel dielectric loss measurement technologies mostly focus on "parallel acquisition," but have not solved the core problems of "synchronization" and "interference suppression," resulting in deviations in the phase difference measurement of three-phase voltage and current signals, which in turn affects the accuracy of dielectric loss factor calculation. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, device, computer equipment, medium, and product for measuring the dielectric loss factor, which can accurately measure the dielectric loss factor of three-phase equipment, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a method for measuring the dielectric loss factor, including:

[0006] The time-domain phase signals corresponding to the three phases of the three-phase device are acquired; wherein, the time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0007] For each phase, the time-domain phase signal corresponding to the phase is subjected to noise reduction and frequency-domain transformation to obtain the frequency-domain phase signal corresponding to the phase.

[0008] Based on the frequency domain phase signals corresponding to the three phases, the dielectric loss factor corresponding to each phase is determined.

[0009] In one embodiment, acquiring the time-domain phase signals corresponding to the three phases of the three-phase device includes:

[0010] Send a data acquisition trigger command to the synchronization trigger module; wherein, the data acquisition trigger command is used to instruct the synchronization trigger module to trigger the acquisition devices in the acquisition channels of different phases to perform synchronous acquisition;

[0011] It receives the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase.

[0012] In one embodiment, the frequency domain phase signal corresponding to each phase includes a fundamental voltage signal and a fundamental current signal;

[0013] The step of determining the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases includes:

[0014] The average voltage value is determined based on the fundamental voltage signals corresponding to the three phases.

[0015] For each phase, the fundamental voltage signal corresponding to the phase is corrected according to the deviation rate between the fundamental voltage signal and the average voltage value corresponding to the phase, to obtain the corrected voltage signal corresponding to the phase; and,

[0016] Based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases, the fundamental current signal corresponding to the phase is corrected to obtain the corrected current signal corresponding to the phase.

[0017] The dielectric loss factor corresponding to each phase is determined based on the corrected voltage signal and corrected current signal corresponding to the three phases, respectively.

[0018] In one embodiment, the step of correcting the fundamental current signal corresponding to the phase based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases to obtain the corrected current signal corresponding to the phase includes:

[0019] Based on the inherent phase relationship of the three phases, determine the first phase difference between the phase and the fundamental current signal corresponding to each of the other phases;

[0020] If, based on the phase difference threshold and each of the first phase differences, it is determined that there is current interference in the phase, the fundamental current signal corresponding to the phase is corrected according to the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

[0021] In one embodiment, determining the dielectric loss factor corresponding to each phase based on the corrected voltage signal and corrected current signal corresponding to the three phases respectively includes:

[0022] For any phase, cross-correlation analysis is performed on the corrected voltage signal and the corrected current signal corresponding to the phase to obtain the time difference between the voltage and current corresponding to the phase.

[0023] Based on the time difference, determine the second phase difference between the voltage and current corresponding to the phase;

[0024] Based on the second phase difference, the dielectric loss factor corresponding to the phase is determined.

[0025] In one embodiment, determining the dielectric loss factor corresponding to the phase based on the second phase difference includes:

[0026] Based on the second phase difference, determine the initial loss factor corresponding to the phase;

[0027] Based on the difference between the initial loss factor corresponding to the phase and the average of the initial loss factors corresponding to the other two phases, it is determined whether the initial loss factor of the phase is an outlier.

[0028] If so, then based on the preset prediction model, the dielectric loss factor corresponding to the phase is determined according to the historical acquisition signal of the phase;

[0029] If not, then the initial loss factor is determined to be the dielectric loss factor corresponding to the phase.

[0030] Secondly, this application also provides a dielectric loss factor measuring device, comprising:

[0031] The signal acquisition module is used to acquire the time-domain phase signals corresponding to the three phases of the three-phase equipment respectively; wherein, the time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0032] The time-frequency conversion module is used to perform noise reduction and frequency domain conversion processing on the time-domain phase signal corresponding to each phase to obtain the frequency-domain phase signal corresponding to the phase.

[0033] The factor determination module is used to determine the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases.

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

[0035] The time-domain phase signals corresponding to the three phases of the three-phase device are acquired; wherein, the time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0036] For each phase, the time-domain phase signal corresponding to the phase is subjected to noise reduction and frequency-domain transformation to obtain the frequency-domain phase signal corresponding to the phase.

[0037] Based on the frequency domain phase signals corresponding to the three phases, the dielectric loss factor corresponding to each phase is determined.

[0038] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0039] The time-domain phase signals corresponding to the three phases of the three-phase device are acquired; wherein, the time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0040] For each phase, the time-domain phase signal corresponding to the phase is subjected to noise reduction and frequency-domain transformation to obtain the frequency-domain phase signal corresponding to the phase.

[0041] Based on the frequency domain phase signals corresponding to the three phases, the dielectric loss factor corresponding to each phase is determined.

[0042] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0043] The time-domain phase signals corresponding to the three phases of the three-phase device are acquired; wherein, the time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0044] For each phase, the time-domain phase signal corresponding to the phase is subjected to noise reduction and frequency-domain transformation to obtain the frequency-domain phase signal corresponding to the phase.

[0045] Based on the frequency domain phase signals corresponding to the three phases, the dielectric loss factor corresponding to each phase is determined.

[0046] The aforementioned dielectric loss factor measurement method, apparatus, computer equipment, dielectric, and product acquire time-domain phase signals corresponding to the three phases of a three-phase device. Each phase's time-domain phase signal is acquired using acquisition devices installed in the phase's acquisition channel, with the same sampling start time and sampling frequency for each phase's acquisition channel. For each phase, noise reduction and frequency-domain conversion are performed on the corresponding time-domain phase signal to obtain the corresponding frequency-domain phase signal. Based on the frequency-domain phase signals corresponding to the three phases, the dielectric loss factor for each phase is determined. This scheme avoids phase deviation caused by different phase sampling time differences through synchronous sampling, reduces the impact of environmental interference and equipment noise on the signal through noise reduction, and accurately extracts the fundamental component through frequency-domain conversion. These multiple steps ensure the accuracy of dielectric loss factor calculation, accurately reflecting the equipment's insulation status. It can acquire the dielectric loss factor of each phase individually, promptly detecting single-phase insulation defects, and also determine whether there are overall problems such as three-phase imbalance through three-phase data comparison, providing comprehensive data support for equipment maintenance. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a diagram illustrating the application environment of a dielectric loss factor measurement method in one embodiment.

[0049] Figure 2 This is a flowchart illustrating a method for measuring the dielectric loss factor in one embodiment.

[0050] Figure 3 This is a schematic diagram of the process for obtaining the time-domain phase signal in one embodiment;

[0051] Figure 4 This is a flowchart illustrating the process of determining the dielectric loss factor in one embodiment;

[0052] Figure 5 This is a flowchart illustrating the process of determining the corrected current signal in one embodiment;

[0053] Figure 6 This is a flowchart illustrating the process of determining the dielectric loss factor in another embodiment;

[0054] Figure 7 This is a flowchart illustrating the process of determining the dielectric loss factor in yet another embodiment;

[0055] Figure 8 This is a flowchart illustrating the method for measuring the dielectric loss factor in another embodiment;

[0056] Figure 9 This is a structural block diagram of a dielectric loss factor measuring device in one embodiment;

[0057] Figure 10 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0059] The dielectric loss factor measurement method provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, the central control device 101 is used to measure the dielectric loss factor of the three-phase device 102. Optionally, the central control device 101 acquires the time-domain phase signals corresponding to the three phases of the three-phase device 102; wherein, the time-domain phase signal corresponding to each phase is acquired by an acquisition device installed in the phase acquisition channel, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same; for each phase, the central control device 101 performs noise reduction and frequency domain transformation processing on the time-domain phase signal corresponding to the phase to obtain the frequency-domain phase signal corresponding to the phase, and determines the dielectric loss factor corresponding to each phase based on the frequency-domain phase signals corresponding to the three phases. The central control device 101 is based on a TIAM335x processor (based on ARM Cortex-A9 architecture, 1GHz clock speed) and undertakes three major functions: system control, data processing, and algorithm execution. The central control unit 101 module integrates a 1000Mbps Ethernet interface, a USB 3.0 interface, and a 4G / 5G wireless communication module, supporting real-time data upload (Ethernet transmission rate ≥100Mbps, 4G / 5G transmission rate ≥10Mbps) and local interaction (USB interface supports external mouse and keyboard operation).

[0060] In one exemplary embodiment, such as Figure 2 As shown, a method for measuring dielectric loss factor is provided, which can be applied to... Figure 1 Taking the central control device 101 as an example, the following steps are specifically included:

[0061] S201, acquire the time-domain phase signals corresponding to the three phases of the three-phase device.

[0062] In this system, the time-domain phase signal corresponding to each phase is acquired by an acquisition device installed in the phase acquisition channel. The sampling start time and sampling frequency of the acquisition devices installed in the acquisition channel of each phase are the same. The acquisition device can be an ADC (Analog-to-Digital Converter) device.

[0063] In this embodiment, a phase-consistent and frequency-stable reference clock can be installed in each acquisition channel corresponding to a single phase to achieve synchronous acquisition of three-phase time-domain phase signals. The reference clock can be a stable temperature-controlled crystal oscillator with a frequency stability ≤1×10^-8 and a temperature coefficient ≤0.01ppm / ℃, capable of generating a high-precision 100MHz reference clock, thus avoiding the influence of ambient temperature changes on the clock frequency. The reference clock is evenly distributed to the three acquisition channels in the acquisition device.

[0064] In addition, each acquisition channel is equipped with an independent phase calibration circuit, which uses a precision potentiometer to condition the phase of the clock signal, ultimately controlling the phase difference between acquisition channels to be ≤ This translates to a time deviation ≤ 0.0028μs (100MHz clock period is 10ns). The phase difference corresponds to a time deviation of 10ns × 0.1° / 360° ≈ 0.0028μs, which is far lower than the design requirement of 1μs.

[0065] Considering that the voltage signal of three-phase equipment is typically 10kV-110kV and the current signal is at the μA level (e.g., transformer leakage current is approximately 1-10μA), it needs to be converted into a 0-5V standard signal that can be acquired by an ADC through a signal conditioning module, while suppressing initial interference. The module uses three independent conditioning circuits (corresponding to phases A, B, and C), each circuit containing three units: voltage divider, current amplification, and filtering. The voltage divider unit can use high-precision metal film resistors to construct a 1000:1 voltage divider network (e.g., a 2MΩ resistor and a 2kΩ resistor in series), with a resistance temperature coefficient ≤5ppm / ℃, ensuring a voltage division ratio error ≤0.1% within the operating temperature range of -40℃ to 85℃; simultaneously, a 0.1μF high-frequency capacitor is connected in parallel to suppress high-frequency interference in the voltage signal. The current amplification unit can be based on the low-noise operational amplifier AD8605 (input offset voltage ≤10μV, input bias current ≤1pA) to construct a current-to-voltage conversion circuit. By controlling an analog switch to switch the feedback resistor via software, an adjustable amplification factor of 100-1000 times can be achieved. It can convert 1μA leakage current into a 0.1-1V voltage signal and 10μA current into a 1-10V signal (clamped to 0-5V by a limiting circuit). The filtering unit can employ a second-order Butterworth low-pass filter (cutoff frequency 500Hz) to perform preliminary filtering of high-frequency noise (such as RF interference) in the signal; simultaneously, it integrates a 50Hz / 60Hz notch filter (frequency can be switched via software) to suppress power frequency harmonic interference (such as the 3rd and 5th harmonics), resulting in a signal-to-noise ratio ≥40dB after filtering.

[0066] The three acquisition channels can use 16-bit high-precision ADCs. Each ADC is responsible for acquiring the voltage and current signals of one channel (each ADC contains 8 analog inputs, but 2 are actually used: 1 for voltage and 1 for current), realizing parallel acquisition of three-phase signals. The sampling rate range of the ADS8688 is 1kHz-1MHz, and the system can be set to 10kHz-100kHz (100kHz is selected when there is strong interference to increase the signal sampling density; 10kHz is selected when there is weak interference to reduce the amount of data). The integral nonlinearity error (INL) is ≤±1LSB, and the differential nonlinearity error (DNL) is ≤±0.5LSB, ensuring the accuracy of the acquired data.

[0067] Optionally, a synchronized timing method can be used to ensure that the sampling start time of the three acquisition devices is completely consistent. A unified sampling frequency is also set; for example, a reference clock can be used to trigger the acquisition devices in the three acquisition channels to acquire phase signals. During the acquisition process, the time-domain signal data of the three phases are stored in real time, forming the original time-domain phase signal datasets corresponding to each of the three phases.

[0068] Local storage can use industrial-grade solid-state drives with a storage capacity of ≥1TB and a read / write speed of ≥500MB / s. It can save 1000 hours of raw acquisition data (calculated at a sampling rate of 100kHz and three-phase channels, the data volume per hour is approximately 100kHz×3×2×2B×3600s≈4.32GB). It is also equipped with an SD card interface (supporting up to 128GB) for backing up key measurement reports. The data is saved in CSV format, including fields such as sampling time, channel number, voltage value, current value, and dielectric loss factor calculation results, which facilitates subsequent analysis using software such as Excel and MATLAB.

[0069] S202, for each phase, perform noise reduction and frequency domain transformation on the time-domain phase signal corresponding to that phase to obtain the frequency-domain phase signal corresponding to that phase.

[0070] The frequency domain phase signal includes the fundamental voltage signal and the fundamental current signal.

[0071] It should be noted that the time-domain noise reduction process targets high-frequency random interference (such as electromagnetic pulses) and power frequency harmonic interference in the time-domain phase signal, employing a two-step processing strategy. First, the db4 wavelet basis (which has good time-frequency localization characteristics) can be selected to decompose the original time-domain phase signal into 5 layers of wavelet coefficients. Soft thresholding is then applied to the high-frequency wavelet coefficients (layers 4-5) (the threshold calculation formula is...). ,in, Due to poor noise labeling, The time-domain phase signal length is used to remove wavelet coefficients corresponding to high-frequency noise. Low-frequency wavelet coefficients (layers 1-3) are retained, and the denoised signal is reconstructed using inverse wavelet transform. After this processing, the suppression rate of high-frequency random interference is ≥80%. Further, a fast Fourier transform is performed on the denoised time-domain phase signal to calculate its spectral distribution. The amplitude and phase of the 50Hz / 60Hz fundamental component are extracted (if the fundamental component accounts for <90%, it indicates severe harmonic interference), and the 3rd, 5th, and 7th harmonic components are removed. Finally, the fundamental voltage signal is obtained. , , ) and fundamental current signal ( , , Harmonic interference suppression rate ≥90%.

[0072] S203, determine the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases respectively.

[0073] For each phase, the fundamental voltage phase and the fundamental current-limiting phase can be extracted from its frequency domain phase signal, and the phase difference between the two can be calculated. Furthermore, the dielectric loss angle is the complementary angle of the phase difference between voltage and current, and the dielectric loss factor is the tangent of the dielectric loss angle. The dielectric loss factor corresponding to the device in that phase can be calculated.

[0074] After completing the calculations for the three phases in sequence, the consistency of the three-phase data can be compared. If the result of one phase deviates too much from the other two phases, the problem of the acquisition device or signal processing link should be investigated, and the calculation should be recalculated to ensure the reliability of the result.

[0075] Furthermore, considering the coupling nature of the insulation state of three-phase equipment (such as the symmetrical insulation structure of a three-phase transformer), its voltage and current can be compared and analyzed based on this characteristic. Abnormal data can be identified by comparing the three-phase data, the abnormal data can be corrected, and then the dielectric loss factor of each phase can be calculated.

[0076] In the aforementioned method for measuring dielectric loss factor, the time-domain phase signals corresponding to the three phases of a three-phase device are acquired. Each phase's time-domain phase signal is acquired using a data acquisition device installed in the phase's acquisition channel, with the same sampling start time and sampling frequency. For each phase, the time-domain phase signal is processed by noise reduction and frequency-domain conversion to obtain the corresponding frequency-domain phase signal. Based on the frequency-domain phase signals corresponding to the three phases, the dielectric loss factor for each phase is determined. This scheme avoids phase deviation caused by sampling time differences between different phases through synchronous sampling, reduces the impact of environmental interference and equipment noise on the signal through noise reduction, and accurately extracts the fundamental component through frequency-domain conversion. These multiple steps ensure the accuracy of the dielectric loss factor calculation, accurately reflecting the insulation status of the equipment. It can acquire the dielectric loss factor of each phase individually, promptly detecting single-phase insulation defects, and also, through three-phase data comparison, determine whether the equipment has overall problems such as three-phase imbalance, providing comprehensive data support for equipment maintenance.

[0077] Optionally, in an exemplary embodiment, such as Figure 3 As shown, a method for obtaining a time-domain phase signal is provided, which specifically includes the following steps:

[0078] S301 sends a data acquisition trigger command to the synchronization trigger module.

[0079] The acquisition trigger command instructs the synchronization trigger module to trigger the acquisition devices in different phase acquisition channels for synchronous acquisition. The synchronization trigger module reserves an external synchronization trigger interface, such as TTL level trigger, which can achieve synchronous triggering with devices such as infrared thermal imagers and partial discharge detectors to meet the requirements of multi-parameter collaborative detection.

[0080] The central control unit configures the core parameters of the acquisition trigger command based on the monitoring requirements of the three-phase equipment, including the sampling start timestamp, sampling frequency, sampling duration, and three-phase channel number (A / B / C phases). Following the communication protocol of the synchronization trigger module (such as TCP / IP, Modbus, or a custom industrial protocol), the configured parameters are encapsulated into a standard trigger command data packet, ensuring that the command can be parsed by the synchronization trigger module. The central control unit sends the acquisition trigger command to the synchronization trigger module through a preset communication link (such as an industrial bus or wireless communication module) and waits for the synchronization trigger module's response.

[0081] After receiving the instruction, the synchronization trigger module parses the sampling parameters and verifies their validity (e.g., whether the sampling frequency is within the rated range of the acquisition device and whether the three-phase channel numbers match). Based on the sampling start timestamp in the instruction, it generates a high-precision synchronization trigger signal. At the preset sampling start time, the synchronization trigger module simultaneously sends trigger signals to the acquisition devices (including ADC modules) in each of the three phases (A, B, and C), forcing all acquisition devices to start sampling at the same time and perform data acquisition according to the sampling frequency set in the instruction.

[0082] S302 receives the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase.

[0083] After sampling, each phase acquisition device converts the acquired analog time-domain signal into a digital time-domain phase signal using an ADC, and marks it with phase identifiers (A / B / C phases) and timestamps according to a preset format. Through the transmission link of the acquisition channel, the time-domain phase signal of each phase is transmitted back to the central control device in real time. Upon receiving the three-phase time-domain signals, the central control device verifies data integrity (e.g., whether there is packet loss, whether the data length matches the sampling duration) and synchronization (e.g., whether the start timestamps of the three phase signals are consistent). If the verification passes, the signal is classified and buffered into the corresponding phase's data area, preparing for subsequent noise reduction and frequency domain conversion processing.

[0084] In this embodiment, the synchronous triggering module triggers each phase acquisition device in a unified manner, which completely avoids the problems of sampling start time deviation and sampling frequency asynchrony caused by the independent start of each acquisition device. This ensures that the three-phase time domain phase signals are completely aligned in the time dimension, providing an accurate data foundation for subsequent dielectric loss factor comparison analysis based on frequency domain signals.

[0085] Optionally, in one embodiment, the frequency domain phase signal corresponding to each phase includes a fundamental voltage signal and a fundamental current signal; such as Figure 4 As shown, a method for determining the dielectric loss factor corresponding to each phase is provided, which specifically includes the following steps:

[0086] S401 determines the average voltage value based on the fundamental voltage signals corresponding to the three phases.

[0087] The fundamental voltage and current signals are accurately extracted from the frequency domain phase signals of each of the three phases, and interference components such as harmonics and noise are filtered out to provide a clean fundamental data foundation for subsequent calculations and corrections. The average voltage can be calculated using the effective value averaging method, as shown in the following formula:

[0088]

[0089] in, This is the average voltage value; This is the fundamental voltage of phase A; This is the fundamental voltage of phase B; This is the fundamental voltage of phase C. The average voltage represents the reference level of the three-phase voltage and is used to measure the degree of deviation of each phase voltage.

[0090] S402, for each phase, the fundamental voltage signal corresponding to the phase is corrected according to the deviation rate between the fundamental voltage signal and the average voltage value of the phase, so as to obtain the corrected voltage signal corresponding to the phase.

[0091] The deviation rate reflects the degree of difference between the voltage of each phase and the average level of the three-phase voltage.

[0092] For each phase, calculate the deviation rate of the fundamental voltage signal relative to the average voltage value, using the following formula:

[0093]

[0094] If the deviation rate of the phase is greater than the preset deviation threshold (e.g., 5%), it is determined that there is voltage interference in the phase, such as poor contact of the voltage probe. Furthermore, the fundamental voltage signal of the phase can be corrected by linear interpolation. The correction principle is to eliminate the deviation of each phase voltage from the average value.

[0095] If all three phases deviate, it indicates a line fault; stop the measurement.

[0096] S403, for each phase, based on the fundamental current signal corresponding to that phase and the inherent phase relationship between the three phases, the fundamental current signal corresponding to that phase is corrected to obtain the corrected current signal corresponding to that phase.

[0097] It should be noted that in a symmetrical three-phase system, the phase difference of the three-phase fundamental currents is fixed. The inherent phase relationship of the three-phase currents can be determined based on the connection method of the three-phase equipment (such as Y-connection or Δ-connection). For example, if the three-phase equipment is connected in a Y-type configuration, the phase difference of the three-phase currents should be... .

[0098] The phase deviation is calculated by comparing the actual acquired phase of the current with the inherent phase. The phase of the original fundamental current signal is then corrected based on the phase deviation, while the amplitude remains unchanged.

[0099] S404 determines the dielectric loss factor for each phase based on the corrected voltage and corrected current signals corresponding to the three phases.

[0100] For each phase, the phase of the corresponding corrected voltage signal and the phase of the corrected current signal are extracted, and the phase difference between the two is calculated. Furthermore, the complementary angle of the phase difference between voltage and current is used as the dielectric loss angle, and the tangent of the dielectric loss component is used as the dielectric loss factor.

[0101] In this embodiment, voltage imbalance is prone to occur in the actual operation of three-phase equipment. Directly using the original fundamental voltage to calculate the dielectric loss factor will introduce deviations. By correcting the voltage average value and deviation rate, the influence of each phase voltage deviating from the average level can be offset, thus improving the accuracy of the voltage signal.

[0102] Optionally, in one embodiment, such as Figure 5 As shown, a method for determining a phase-corresponding corrected current signal is provided, which specifically includes the following steps:

[0103] S501, based on the inherent phase relationship of the three phases, determines the first phase difference between this phase and the fundamental current signal corresponding to each of the other phases.

[0104] For each phase of the fundamental current signal, using its phase as a reference, the phase difference between it and the two-phase fundamental current signal is calculated; this difference is the first phase difference. For example... ,in, This represents the first phase difference between phase A and phase B.

[0105] S502, when it is determined that there is current interference in the phase based on the phase difference threshold and each first phase difference, the fundamental current signal corresponding to the phase is corrected according to the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

[0106] If the phase difference of a certain phase exceeds If current interference is detected in a phase, such as current sensor saturation, the corresponding fundamental current signal can be corrected based on the phase relationship of the other two phase currents to obtain a corrected current signal. .

[0107] In this embodiment, the interference current phase can be quickly identified by directly comparing the inherent phase relationship of the three-phase current with the first phase difference threshold without the need for additional detection equipment. This avoids bringing the distorted signal into the subsequent dielectric loss factor calculation. The correction benchmark for the interference phase comes from the inherent phase relationship of the two normal phases, rather than a fixed value set by an individual. The correction logic fits the operating characteristics of the three-phase system and can restore the true phase characteristics of the interference phase current to the greatest extent.

[0108] Optionally, in one embodiment, such as Figure 6 As shown, a method for determining the dielectric loss factor corresponding to each phase is provided, which specifically includes the following steps:

[0109] S601, for any phase, perform cross-correlation analysis on the corrected voltage signal and corrected current signal corresponding to that phase to obtain the time difference between the voltage and current corresponding to that phase.

[0110] For any phase, perform cross-correlation analysis on the corrected voltage signal and the corrected current signal corresponding to that phase. For example, the cross-correlation function is:

[0111]

[0112] When the cross-correlation value reaches its maximum value, the corresponding This represents the time difference between voltage and current.

[0113] S602, based on the time difference, determines the second phase difference between the voltage and current corresponding to the phase.

[0114] Optionally, the process of determining the second phase difference between the voltage and current corresponding to the phase based on the time difference can be expressed by the following formula:

[0115]

[0116] in, For the power frequency cycle, at 50Hz .

[0117] The accuracy of the second phase difference calculated using the above method .

[0118] S603, determine the dielectric loss factor corresponding to the phase based on the second phase difference.

[0119] Optionally, the process of determining the dielectric loss factor corresponding to the phase based on the second phase difference can be expressed by the following formula:

[0120]

[0121] For example, when hour, ;like This indicates that the current leads the voltage (e.g., there is capacitive leakage in the equipment). In this case, the dielectric loss factor takes a negative value, indicating that there is an abnormality in the equipment insulation.

[0122] For multiple sets of dielectric loss factor data within the acquisition period (e.g., 5 minutes, 50kHz sampling rate, totaling 5×60×50kHz=15000 sets of data), a moving average algorithm is applied, with a window size of 100 (i.e., the average value is calculated once for every 100 sets of data), resulting in 150 smoothed dielectric loss factor values. The average value of these 150 sets of data is then calculated as the final dielectric loss factor value for that phase (e.g., tanδ_A=0.0013). Moving average processing can reduce the influence of random errors, making the dielectric loss factor measurement accuracy ≤0.0001.

[0123] In this embodiment, cross-correlation analysis has a natural ability to suppress noise. Even if a small amount of interference noise remains in the corrected voltage and current signals, it will not significantly affect the peak position of the cross-correlation function. Compared with the method of directly extracting the phase difference from the frequency domain, it has a stronger anti-interference ability.

[0124] Optionally, in one embodiment, such as Figure 7 As shown, a method for determining the dielectric loss factor corresponding to a phase is provided, which specifically includes the following steps:

[0125] S701, determine the initial loss factor corresponding to the phase based on the second phase difference.

[0126] Optionally, the dielectric loss factor corresponding to the phase can be calculated based on the method in step S603 of the above embodiments, and used as the initial loss factor. This will not be elaborated here.

[0127] S702, based on the difference between the initial loss factor corresponding to this phase and the average value of the initial loss factors corresponding to the other two phases, determine whether the initial loss factor of this phase is an outlier; if yes, then execute S703; if no, then execute S704.

[0128] In this embodiment, an association matrix of the initial loss factors of the three phases is constructed, and a normal difference range is set. The average value of the initial loss factors corresponding to the other two phases is calculated, and the absolute value of the difference between the initial loss factor corresponding to the phase and the average value is calculated. If the calculated absolute value is within the normal difference range, the initial loss factor of the phase is determined to be an outlier; if the calculated absolute value is not within the normal difference range, the initial loss factor of the phase is determined to be an outlier.

[0129] S703, based on a preset prediction model, determines the dielectric loss factor corresponding to the phase according to the historical acquisition signal of the phase.

[0130] If the initial loss factor of a phase is determined to be an outlier, it is necessary to propose the corresponding initial loss factor for that phase. Furthermore, the historical acquisition signal of that phase is input into a preset prediction model (such as a linear prediction model) to obtain the dielectric loss factor predicted by the preset prediction model.

[0131] S704, determine the initial loss factor, which is the dielectric loss factor corresponding to the phase.

[0132] If it is determined that the initial loss factor of the phase is not an outlier, the initial loss factor is directly used as the dielectric loss factor corresponding to the phase.

[0133] In this embodiment, based on the consistency comparison of the initial loss factors of the three phases, abnormal values ​​caused by signal interference and acquisition failures can be quickly identified, avoiding the use of distorted data as the basis for judging the insulation status of the equipment and reducing the risk of misjudgment. For abnormal phases, a predictive model combined with historical signal correction is used. It does not rely on the currently potentially distorted acquisition data, but derives the true value based on the historical variation law of the equipment insulation characteristics. It can still output reliable results under scenarios such as complex electromagnetic interference and local acquisition failures.

[0134] It should be noted that, to ensure the reliability of the measurement data, a three-level data verification mechanism is set up, consisting of consistency verification, historical data comparison, and report generation. The consistency verification process involves setting two verification conditions: one condition is that the dielectric loss factor of each phase is less than the standard threshold for three-phase equipment insulation; the other condition is that the difference between the maximum and minimum values ​​of the dielectric loss factor of the three phases is less than a preset threshold, which can be 0.002.

[0135] The historical data comparison process involves retrieving historical monitoring data (including normal operating conditions, minor interference, and other scenarios) from the equipment over the past 6 months to 1 year, removing distorted historical data that has been marked, using a moving average method to fit and form a baseline for historical loss factor changes, and calculating the normal fluctuation range Δtanδ of the historical data (usually taken as 2 to 3 times the standard deviation of the historical data). The current initial valid data for each phase is compared with the historical change baseline of the corresponding phase. If the current data is within the preset range and conforms to the historical change trend (such as slowly increasing with operating time without sudden jumps), it is determined to be the final valid data.

[0136] The report generation process involves summarizing the results of the first two levels of verification to form a standardized monitoring report that clearly presents the data validity, equipment insulation status assessment conclusions, and risk warnings, providing an intuitive and reliable basis for operation and maintenance decisions.

[0137] Figure 8This is a flowchart illustrating a dielectric loss factor measurement method in another embodiment. Based on the above embodiments, this embodiment provides an optional example of a dielectric loss factor measurement method. (Combined with...) Figure 8 The specific implementation process is as follows:

[0138] S801 sends a data acquisition trigger command to the synchronous trigger module.

[0139] Among them, the acquisition trigger command is used to instruct the synchronous trigger module to trigger the acquisition devices in the acquisition channels of different phases to perform synchronous acquisition;

[0140] S802 receives the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase of the three-phase equipment.

[0141] S803 performs noise reduction and frequency domain transformation on the time-domain phase signal corresponding to each phase to obtain the fundamental voltage signal and fundamental current signal corresponding to the phase.

[0142] S804 determines the average voltage value based on the fundamental voltage signals corresponding to the three phases.

[0143] S805, for each phase, corrects the fundamental voltage signal corresponding to the phase based on the deviation rate between the fundamental voltage signal and the average voltage value, to obtain the corrected voltage signal corresponding to the phase.

[0144] Optionally, based on the inherent phase relationship of the three phases, a first phase difference is determined between the phase and the fundamental current signal corresponding to each other phase; if current interference is determined to exist in the phase based on the phase difference threshold and each first phase difference, the fundamental current signal corresponding to the phase is corrected based on the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

[0145] S806, for each phase, corrects the fundamental current signal corresponding to the phase based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases, to obtain the corrected current signal corresponding to the phase.

[0146] S807 performs cross-correlation analysis on the corrected voltage signal and corrected current signal corresponding to any phase to obtain the time difference between the voltage and current corresponding to the phase.

[0147] S808 determines the second phase difference between the voltage and current corresponding to any phase based on the time difference.

[0148] S809: For any phase, determine the dielectric loss factor corresponding to the phase based on the second phase difference.

[0149] Optionally, based on the second phase difference, the initial loss factor corresponding to the phase is determined; based on the difference between the initial loss factor corresponding to the phase and the average of the initial loss factors corresponding to the other two phases, it is determined whether the initial loss factor of the phase is an outlier; if so, based on the preset prediction model and the historical acquisition signal of the phase, the dielectric loss factor corresponding to the phase is determined; if not, the initial loss factor is determined as the dielectric loss factor corresponding to the phase.

[0150] The specific processes of S801-S809 described above can be found in the description of the above method embodiments. Their implementation principles and technical effects are similar, and will not be repeated here.

[0151] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0152] Based on the same inventive concept, this application also provides a dielectric loss factor measuring device for implementing the dielectric loss factor measuring method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations of one or more dielectric loss factor measuring device embodiments provided below can be found in the limitations of the dielectric loss factor measuring method described above, and will not be repeated here.

[0153] In one exemplary embodiment, such as Figure 9 As shown, a dielectric loss factor measuring device 900 is provided, comprising: a signal acquisition module 910, a time-frequency conversion module 920, and a factor determination module 930, wherein:

[0154] The signal acquisition module 910 is used to acquire the time-domain phase signals corresponding to the three phases of the three-phase equipment. The time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the phase acquisition channel. The sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0155] The time-frequency conversion module 920 is used to perform noise reduction and frequency domain conversion processing on the time-domain phase signal corresponding to each phase to obtain the frequency-domain phase signal corresponding to the phase.

[0156] The factor determination module 930 is used to determine the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases.

[0157] The aforementioned dielectric loss factor measurement device acquires the time-domain phase signals corresponding to the three phases of a three-phase device. Each phase's time-domain phase signal is acquired by a data acquisition device installed in the phase's acquisition channel, with the same sampling start time and sampling frequency for each phase's acquisition channel. For each phase, the corresponding time-domain phase signal undergoes noise reduction and frequency-domain conversion to obtain the corresponding frequency-domain phase signal. Based on the frequency-domain phase signals corresponding to the three phases, the dielectric loss factor for each phase is determined. This scheme avoids phase deviation caused by different phase sampling time differences through synchronous sampling, reduces the impact of environmental interference and equipment noise on the signal through noise reduction, and accurately extracts the fundamental component through frequency-domain conversion. These multiple steps ensure the accuracy of the dielectric loss factor calculation, accurately reflecting the equipment's insulation status. It can acquire the dielectric loss factor of each phase individually to promptly detect single-phase insulation defects, and also compare three-phase data to determine if there are overall problems such as three-phase imbalance, providing comprehensive data support for equipment maintenance.

[0158] In one embodiment, the signal acquisition module 910 is specifically used for:

[0159] Send a data acquisition trigger command to the synchronization trigger module; wherein, the data acquisition trigger command is used to instruct the synchronization trigger module to trigger the acquisition devices in the acquisition channels of different phases to perform synchronous acquisition; receive the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase.

[0160] In one embodiment, the frequency domain phase signal corresponding to each phase includes a fundamental voltage signal and a fundamental current signal; the factor determination module 930 includes:

[0161] The mean value determination unit is used to determine the average voltage value based on the fundamental voltage signals corresponding to the three phases.

[0162] The signal correction unit is used to correct the fundamental voltage signal corresponding to each phase according to the deviation rate between the fundamental voltage signal and the average voltage value of the phase, so as to obtain the corrected voltage signal corresponding to the phase; and to correct the fundamental current signal corresponding to the phase according to the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases, so as to obtain the corrected current signal corresponding to the phase.

[0163] The factor determination unit is used to determine the dielectric loss factor corresponding to each phase based on the corrected voltage signal and corrected current signal corresponding to the three phases respectively.

[0164] In one embodiment, the signal correction unit is specifically used for:

[0165] Based on the inherent phase relationship of the three phases, the first phase difference between the phase and the fundamental current signal corresponding to each other phase is determined. When it is determined that there is current interference in the phase based on the phase difference threshold and each first phase difference, the fundamental current signal corresponding to the phase is corrected according to the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

[0166] In one embodiment, the factor determination unit includes:

[0167] The first determining unit is used to perform cross-correlation analysis on the corrected voltage signal and corrected current signal corresponding to any phase, and obtain the time difference between the voltage and current corresponding to the phase.

[0168] The second determining unit is used to determine the second phase difference between the voltage and current corresponding to the phase based on the time difference.

[0169] The third determining unit is used to determine the dielectric loss factor corresponding to the phase based on the second phase difference.

[0170] In one embodiment, the third determination from the unit is specifically used for:

[0171] Based on the second phase difference, determine the initial loss factor corresponding to the phase; based on the difference between the initial loss factor corresponding to the phase and the average of the initial loss factors corresponding to the other two phases, determine whether the initial loss factor of the phase is an outlier; if so, then based on the preset prediction model and the historical acquisition signal of the phase, determine the dielectric loss factor corresponding to the phase; if not, then determine the initial loss factor as the dielectric loss factor corresponding to the phase.

[0172] Each module in the aforementioned dielectric loss factor measuring device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0173] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 10As shown, the computer device includes a processor, memory, communication interface, display screen, and input device connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage medium. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for measuring the dielectric loss factor.

[0174] Those skilled in the art will understand that Figure 10 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0175] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0176] The time-domain phase signals corresponding to the three phases of the three-phase equipment are acquired. The time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase. The sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0177] For each phase, the time-domain phase signal corresponding to the phase is denoised and frequency-domain transformed to obtain the frequency-domain phase signal corresponding to the phase.

[0178] Based on the frequency domain phase signals corresponding to the three phases, determine the dielectric loss factor corresponding to each phase.

[0179] In one embodiment, when the processor executes a computer program to obtain the time-domain phase signals corresponding to the three phases of the three-phase device, it also performs the following steps:

[0180] Send a data acquisition trigger command to the synchronization trigger module; wherein, the data acquisition trigger command is used to instruct the synchronization trigger module to trigger the acquisition devices in the acquisition channels of different phases to perform synchronous acquisition; receive the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase.

[0181] In one embodiment, the frequency domain phase signal corresponding to each phase includes a fundamental voltage signal and a fundamental current signal; when the processor executes the computer program to determine the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases, it also performs the following steps:

[0182] Based on the fundamental voltage signals corresponding to the three phases, the average voltage is determined. For each phase, the fundamental voltage signal is corrected according to the deviation rate between the fundamental voltage signal and the average voltage, resulting in a corrected voltage signal. Furthermore, the fundamental current signal is corrected according to the fundamental current signal and the inherent phase relationship between the three phases, resulting in a corrected current signal. Finally, the dielectric loss factor for each phase is determined based on the corrected voltage and current signals corresponding to the three phases.

[0183] In one embodiment, when the processor executes a computer program to correct the fundamental current signal corresponding to a phase based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases, and obtains the corrected current signal corresponding to the phase, the following steps are also performed:

[0184] Based on the inherent phase relationship of the three phases, the first phase difference between the phase and the fundamental current signal corresponding to each other phase is determined. When it is determined that there is current interference in the phase based on the phase difference threshold and each first phase difference, the fundamental current signal corresponding to the phase is corrected according to the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

[0185] In one embodiment, when the processor executes a computer program to determine the dielectric loss factor corresponding to each phase based on the corrected voltage signal and corrected current signal corresponding to the three phases respectively, it also performs the following steps:

[0186] For any phase, cross-correlation analysis is performed on the corrected voltage signal and corrected current signal corresponding to the phase to obtain the time difference between the voltage and current corresponding to the phase; based on the time difference, the second phase difference between the voltage and current corresponding to the phase is determined; based on the second phase difference, the dielectric loss factor corresponding to the phase is determined.

[0187] In one embodiment, when the processor executes a computer program to determine the dielectric loss factor corresponding to the phase based on the second phase difference, it also performs the following steps:

[0188] Based on the second phase difference, determine the initial loss factor corresponding to the phase; based on the difference between the initial loss factor corresponding to the phase and the average of the initial loss factors corresponding to the other two phases, determine whether the initial loss factor of the phase is an outlier; if so, then based on the preset prediction model and the historical acquisition signal of the phase, determine the dielectric loss factor corresponding to the phase; if not, then determine the initial loss factor as the dielectric loss factor corresponding to the phase.

[0189] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0190] The time-domain phase signals corresponding to the three phases of the three-phase equipment are acquired. The time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase. The sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0191] For each phase, the time-domain phase signal corresponding to the phase is denoised and frequency-domain transformed to obtain the frequency-domain phase signal corresponding to the phase.

[0192] Based on the frequency domain phase signals corresponding to the three phases, determine the dielectric loss factor corresponding to each phase.

[0193] In one embodiment, when the processor executes a computer program to obtain the time-domain phase signals corresponding to the three phases of the three-phase device, it also performs the following steps:

[0194] Send a data acquisition trigger command to the synchronization trigger module; wherein, the data acquisition trigger command is used to instruct the synchronization trigger module to trigger the acquisition devices in the acquisition channels of different phases to perform synchronous acquisition; receive the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase.

[0195] In one embodiment, the frequency domain phase signal corresponding to each phase includes a fundamental voltage signal and a fundamental current signal; when the processor executes the computer program to determine the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases, it also performs the following steps:

[0196] Based on the fundamental voltage signals corresponding to the three phases, the average voltage is determined. For each phase, the fundamental voltage signal is corrected according to the deviation rate between the fundamental voltage signal and the average voltage, resulting in a corrected voltage signal. Furthermore, the fundamental current signal is corrected according to the fundamental current signal and the inherent phase relationship between the three phases, resulting in a corrected current signal. Finally, the dielectric loss factor for each phase is determined based on the corrected voltage and current signals corresponding to the three phases.

[0197] In one embodiment, when the processor executes a computer program to correct the fundamental current signal corresponding to a phase based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases, and obtains the corrected current signal corresponding to the phase, the following steps are also performed:

[0198] Based on the inherent phase relationship of the three phases, the first phase difference between the phase and the fundamental current signal corresponding to each other phase is determined. When it is determined that there is current interference in the phase based on the phase difference threshold and each first phase difference, the fundamental current signal corresponding to the phase is corrected according to the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

[0199] In one embodiment, when the processor executes a computer program to determine the dielectric loss factor corresponding to each phase based on the corrected voltage signal and corrected current signal corresponding to the three phases respectively, it also performs the following steps:

[0200] For any phase, cross-correlation analysis is performed on the corrected voltage signal and corrected current signal corresponding to the phase to obtain the time difference between the voltage and current corresponding to the phase; based on the time difference, the second phase difference between the voltage and current corresponding to the phase is determined; based on the second phase difference, the dielectric loss factor corresponding to the phase is determined.

[0201] In one embodiment, when the processor executes a computer program to determine the dielectric loss factor corresponding to the phase based on the second phase difference, it also performs the following steps:

[0202] Based on the second phase difference, determine the initial loss factor corresponding to the phase; based on the difference between the initial loss factor corresponding to the phase and the average of the initial loss factors corresponding to the other two phases, determine whether the initial loss factor of the phase is an outlier; if so, then based on the preset prediction model and the historical acquisition signal of the phase, determine the dielectric loss factor corresponding to the phase; if not, then determine the initial loss factor as the dielectric loss factor corresponding to the phase.

[0203] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0204] The time-domain phase signals corresponding to the three phases of the three-phase equipment are acquired. The time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase. The sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same.

[0205] For each phase, the time-domain phase signal corresponding to the phase is denoised and frequency-domain transformed to obtain the frequency-domain phase signal corresponding to the phase.

[0206] Based on the frequency domain phase signals corresponding to the three phases, determine the dielectric loss factor corresponding to each phase.

[0207] In one embodiment, when the processor executes a computer program to obtain the time-domain phase signals corresponding to the three phases of the three-phase device, it also performs the following steps:

[0208] Send a data acquisition trigger command to the synchronization trigger module; wherein, the data acquisition trigger command is used to instruct the synchronization trigger module to trigger the acquisition devices in the acquisition channels of different phases to perform synchronous acquisition; receive the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase.

[0209] In one embodiment, the frequency domain phase signal corresponding to each phase includes a fundamental voltage signal and a fundamental current signal; when the processor executes the computer program to determine the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases, it also performs the following steps:

[0210] Based on the fundamental voltage signals corresponding to the three phases, the average voltage is determined. For each phase, the fundamental voltage signal is corrected according to the deviation rate between the fundamental voltage signal and the average voltage, resulting in a corrected voltage signal. Furthermore, the fundamental current signal is corrected according to the fundamental current signal and the inherent phase relationship between the three phases, resulting in a corrected current signal. Finally, the dielectric loss factor for each phase is determined based on the corrected voltage and current signals corresponding to the three phases.

[0211] In one embodiment, when the processor executes a computer program to correct the fundamental current signal corresponding to a phase based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases, and obtains the corrected current signal corresponding to the phase, the following steps are also performed:

[0212] Based on the inherent phase relationship of the three phases, the first phase difference between the phase and the fundamental current signal corresponding to each other phase is determined. When it is determined that there is current interference in the phase based on the phase difference threshold and each first phase difference, the fundamental current signal corresponding to the phase is corrected according to the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

[0213] In one embodiment, when the processor executes a computer program to determine the dielectric loss factor corresponding to each phase based on the corrected voltage signal and corrected current signal corresponding to the three phases respectively, it also performs the following steps:

[0214] For any phase, cross-correlation analysis is performed on the corrected voltage signal and corrected current signal corresponding to the phase to obtain the time difference between the voltage and current corresponding to the phase; based on the time difference, the second phase difference between the voltage and current corresponding to the phase is determined; based on the second phase difference, the dielectric loss factor corresponding to the phase is determined.

[0215] In one embodiment, when the processor executes a computer program to determine the dielectric loss factor corresponding to the phase based on the second phase difference, it also performs the following steps:

[0216] Based on the second phase difference, determine the initial loss factor corresponding to the phase; based on the difference between the initial loss factor corresponding to the phase and the average of the initial loss factors corresponding to the other two phases, determine whether the initial loss factor of the phase is an outlier; if so, then based on the preset prediction model and the historical acquisition signal of the phase, determine the dielectric loss factor corresponding to the phase; if not, then determine the initial loss factor as the dielectric loss factor corresponding to the phase.

[0217] It should be noted that the data involved in this application (including but not limited to data used for analysis, data stored, data displayed, etc.) are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0218] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0219] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0220] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for measuring dielectric loss factor, characterized in that, The method includes: The time-domain phase signals corresponding to the three phases of the three-phase device are acquired; wherein, the time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same. For each phase, the time-domain phase signal corresponding to the phase is subjected to noise reduction and frequency-domain transformation to obtain the frequency-domain phase signal corresponding to the phase. Based on the frequency domain phase signals corresponding to the three phases, the dielectric loss factor corresponding to each phase is determined.

2. The method according to claim 1, characterized in that, The acquisition of the time-domain phase signals corresponding to the three phases of the three-phase device includes: Send a data acquisition trigger command to the synchronization trigger module; wherein, the data acquisition trigger command is used to instruct the synchronization trigger module to trigger the acquisition devices in the acquisition channels of different phases to perform synchronous acquisition; It receives the time-domain phase signal acquired by the acquisition device in the acquisition channel of each phase.

3. The method according to claim 1, characterized in that, The frequency domain phase signal corresponding to each phase includes the fundamental voltage signal and the fundamental current signal; The step of determining the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases includes: The average voltage value is determined based on the fundamental voltage signals corresponding to the three phases. For each phase, the fundamental voltage signal corresponding to the phase is corrected according to the deviation rate between the fundamental voltage signal and the average voltage value corresponding to the phase, to obtain the corrected voltage signal corresponding to the phase; and, Based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases, the fundamental current signal corresponding to the phase is corrected to obtain the corrected current signal corresponding to the phase. The dielectric loss factor corresponding to each phase is determined based on the corrected voltage signal and corrected current signal corresponding to the three phases, respectively.

4. The method according to claim 3, characterized in that, The step of correcting the fundamental current signal corresponding to the phase based on the fundamental current signal corresponding to the phase and the inherent phase relationship between the three phases to obtain the corrected current signal corresponding to the phase includes: Based on the inherent phase relationship of the three phases, the first phase difference between the phase and the fundamental current signal corresponding to each of the other phases is determined; If, based on the phase difference threshold and each of the first phase differences, it is determined that there is current interference in the phase, the fundamental current signal corresponding to the phase is corrected according to the inherent phase relationship of the other two phases to obtain the corrected current signal corresponding to the phase.

5. The method according to claim 3, characterized in that, The step of determining the dielectric loss factor corresponding to each phase based on the corrected voltage signal and corrected current signal corresponding to the three phases includes: For any phase, cross-correlation analysis is performed on the corrected voltage signal and corrected current signal corresponding to the phase to obtain the time difference between the voltage and current corresponding to the phase. Based on the time difference, determine the second phase difference between the voltage and current corresponding to the phase; Based on the second phase difference, the dielectric loss factor corresponding to the phase is determined.

6. The method according to claim 5, characterized in that, The step of determining the dielectric loss factor corresponding to the phase based on the second phase difference includes: Based on the second phase difference, determine the initial loss factor corresponding to the phase; Based on the difference between the initial loss factor corresponding to the phase and the average of the initial loss factors corresponding to the other two phases, it is determined whether the initial loss factor of the phase is an outlier. If so, then based on the preset prediction model, the dielectric loss factor corresponding to the phase is determined according to the historical acquisition signal of the phase; If not, then the initial loss factor is determined to be the dielectric loss factor corresponding to the phase.

7. A dielectric loss factor measuring device, characterized in that, The device includes: The signal acquisition module is used to acquire the time-domain phase signals corresponding to the three phases of the three-phase equipment respectively; wherein, the time-domain phase signal corresponding to each phase is acquired by the acquisition device installed in the acquisition channel of the phase, and the sampling start time and sampling frequency of the acquisition device installed in the acquisition channel of each phase are the same. The time-frequency conversion module is used to perform noise reduction and frequency domain conversion processing on the time-domain phase signal corresponding to each phase to obtain the frequency-domain phase signal corresponding to the phase. The factor determination module is used to determine the dielectric loss factor corresponding to each phase based on the frequency domain phase signals corresponding to the three phases.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

Images