94 results about "Capacitor voltage transformer" patented technology

A method, apparatus and system for state evaluation of metrological characteristics of a capacitor voltage transformer, relating to the technical field of voltage measurement. The method comprises the following steps: acquiring operation data of a capacitor voltage transformer, establishing a metrological performance evaluation model, and obtaining a statistical control threshold (S1); collecting in real time the operation data of the capacitor voltage transformer, and calculating a statistic of the operation data by means of the metrological performance evaluation model (S2); comparing the statistic of the operation data with the statistical control threshold to determine whether a fault occurs in the capacitor voltage transformer (S3); and detecting a change trend of a primary signal and a secondary signal of the tested capacitor voltage transformer to determine whether metrological characteristics are abnormal (S4). In the method, the concept of time is introduced, by providing a timestamp, the influence of newly obtained data on the metrological performance evaluation model is greater, and by means of real-time update, the metrological performance evaluation model can be updated, so that when in a stable state, the detection time is reduced, and the model calculation is reduced.

The invention discloses an online monitoring method for a capacitor voltage transformer, and the method relates to setting a host and a plurality of slaves which communicate with each other in a wireless or wired manner. And each slave comprises a slave MCU and an AD acquisition module and is used for synchronously acquiring fault signal data of the CVT transformer. Collected data are transmitted to the host computer through the slave computer MCU, and the host computer is responsible for reading and storing the data and carrying out comparative analysis. By comparing the data of the plurality of slaves at the same moment with the historical data of the same slave, the host can identify a fault point and send out corresponding alarm information. The method achieves the real-time monitoring of the CVT, and improves the safety and stability of a power system.

The invention provides a capacitor voltage transformer error online detection method and system, and the method comprises the steps: collecting a secondary output signal of a three-phase capacitor voltage transformer, and carrying out the data preprocessing; based on the collected data, constructing a deep neural network learning model based on a stacked auto-encoder, and extracting deep features of the data through multilayer nonlinear transformation to obtain reconstructed data; taking the original data and the reconstructed data as input data, respectively carrying out co-integration analysis, and calculating a co-integration matrix and an equalization error; combining the reconstruction data with the equilibrium error, constructing a composite statistical magnitude and calculating a statistical magnitude threshold value; and collecting online measurement data of the capacitor voltage transformer, calculating monitoring statistics and carrying out abnormity diagnosis. The technical problems that disturbance components and error information in measurement data are difficult to distinguish, non-linear and non-stationary components in measurement errors of the capacitor voltage transformer are difficult to analyze, and the online detection accuracy and real-time performance of the measurement errors are low are solved.

The invention relates to a test method and device for examining broadband measurement performance of a capacitor voltage transformer. The method comprises the following steps: frequency response test: acquiring sine wave voltage signals and first output voltage signals output by the capacitor voltage transformer to be tested for multiple times; processing the signals at different frequency points to obtain gain, phase characteristics and steady-state response capability at each frequency point; a square wave signal transmission test: collecting a square wave voltage signal and a second output voltage signal output by the capacitor voltage transformer to be tested; carrying out signal time-frequency domain analysis to obtain rapid voltage change transient response capability and broadband measurement accuracy; an operation / lightning impulse transmission test: collecting a transient operation / lightning impulse wave voltage signal and a third output voltage signal output by the capacitor voltage transformer to be tested; signal processing is carried out, and the response capability and high-frequency measurement accuracy of the transient high-frequency voltage signal are obtained; and the broadband measurement performance is obtained. Compared with the prior art, the method has the advantages of comprehensively examining the broadband measurement performance of the capacitor voltage transformer and the like.

The embodiment of the invention discloses a transformer winding state diagnosis method using parameter transformation and related equipment, and the method comprises the steps: injecting high-frequency voltage signals with different frequencies into a transformer through a capacitor voltage transformer, and obtaining a response voltage signal outputted by the transformer; drawing a frequency response curve between the response voltage signal and the frequency according to the high-frequency voltage signal and the response voltage signal; according to the frequency response curve, obtaining a plurality of resonant frequency points between the capacitor voltage transformer and the transformer, and a resonant voltage value corresponding to each resonant frequency point; and the winding state of the transformer is diagnosed according to the resonant frequency point and the resonant voltage value, whether the winding of the online operation transformer has a fault can be identified, and the transformer does not need to be changed into an offline state, so that real-time operation state information of the transformer is provided, and the requirements of a modern power grid on real-time monitoring and quick response are met.

The invention provides a capacitor voltage transformer partial voltage capacitance measuring method based on short circuit frequency scanning, and belongs to the field of electrical insulation detection of electrical equipment, and the method comprises the steps: carrying out the first short circuit impedance test of a capacitor voltage transformer, measuring the frequency-dependent short circuit impedance containing a second capacitor, and obtaining the first frequency-dependent short circuit impedance; performing a second short-circuit impedance test, and measuring frequency-dependent short-circuit impedance including the first capacitor and the second capacitor to obtain second frequency-dependent short-circuit impedance; drawing a frequency-dependent short-circuit impedance curve according to the first frequency-dependent short-circuit impedance and the second frequency-dependent short-circuit impedance, and calculating to obtain a first capacitance reference value and a second capacitance reference value; the first capacitance reference value and the second capacitance reference value are combined with the ratio of the intermediate voltage transformer, a measured value of the voltage dividing capacitance is calculated, and measurement of the voltage dividing capacitance of the capacitor voltage transformer is completed. The problems that wiring is complex and the precision is greatly influenced by a wiring mode in an existing capacitance value measuring method are solved.

The invention discloses a voltage transformer error prediction method based on modal decomposition and a gating circulation unit. The method comprises the following steps: 1, collecting historical error data of a capacitor voltage transformer to construct a time sequence data set; 2, dynamically adjusting a noise amplitude coefficient based on signal frequency domain characteristics by adopting an improved modal decomposition method, and performing multiple decomposition to obtain a mean modal component; 3, calculating an information entropy value of each component, classifying the components according to the entropy values and the time-frequency graph, and carrying out noise reduction on the high-entropy components by adopting a self-adaptive wavelet packet threshold value; 4, designing a non-local attention mechanism enhanced error signal prediction model, and dynamically fusing local time sequence features and global context information through a gating coefficient; 5, establishing a sub-modal parallel training framework, performing modeling prediction on each component, and performing fusion output; and 6, performing model performance evaluation and verification to verify the effectiveness of the method. The method effectively improves the prediction precision of the output signal of the voltage transformer, and can effectively meet the signal prediction requirements under complex working conditions.

The invention provides a group phase error guided abnormal dielectric loss diagnosis method for a capacitor voltage transformer (CVT). The method comprises the following steps: acquiring secondary voltage initial phase data of an in-phase capacitor voltage transformer (CVT) at the same voltage level in a transformer substation; performing feature extraction on the secondary voltage initial phase data, and constructing a dielectric loss phase offset feature quantity based on wavelet decomposition reconstruction and a time sequence decomposition algorithm; density clustering is carried out on the dielectric loss phase offset characteristic quantity, and an abnormal CVT is positioned; and constructing a dielectric loss phase error characteristic quantity by using secondary voltage initial phase data of the normal CVT, and calculating a dielectric loss factor of the abnormal CVT. According to the dielectric loss abnormity diagnosis method provided by the invention, the dependence of periodic power failure can be eliminated, the positioning and abnormity degree monitoring of the dielectric loss abnormity CVT can be realized without additionally arranging a sensor, the insulation degradation state of the capacitor unit of the CVT can be evaluated in real time, the further development of potential insulation faults is avoided, and the safe and stable operation of the CVT and a power system is ensured.

The invention relates to an operation and maintenance decision-making method and system for a capacitor voltage transformer, and the method comprises the following steps: collecting historical operation data of the capacitor voltage transformer, and carrying out the preprocessing of the historical operation data; constructing a multi-task model, training the multi-task model through the preprocessed historical operation data of the capacitor voltage transformer in the full life cycle, and completing a residual life prediction task and a fault classification task of the capacitor voltage transformer through the trained multi-task model; and performing operation and maintenance decision on the capacitor voltage transformer based on the residual life and the fault category of the capacitor voltage transformer output by the multi-task model.

The invention discloses a method and system for measuring frequency characteristics of a capacitor voltage transformer, a terminal and a medium, and relates to the technical field of voltage transformers, and the method is characterized in that the transient voltage of a power system is used as the excitation voltage of the primary side of the CVT, and the response of the secondary side of the CVT to the transient voltage is collected to obtain the transient voltage response; performing spectral analysis on the transient voltage response, identifying a valley point and a peak point, and extracting a valley frequency corresponding to the valley point and a peak frequency corresponding to the peak point; and calculating stray parameters of the CVT according to the valley frequency and / or the peak frequency to obtain a frequency characteristic measurement result. According to the invention, on-line measurement of the frequency response characteristic of the CVT can be realized; excitation voltage does not need to be applied to the primary side of the CVT, the primary voltage of the CVT does not need to be measured, and no interference is introduced to equipment and a system.

The invention relates to the technical field of capacitive voltage transformers, in particular to a capacitive voltage transformer and a capacitance variation adjusting system thereof. The adjusting system comprises a capacitance measuring module which is provided with two groups of test electrodes, one group is connected with a high-voltage electrode of a high-voltage capacitor in parallel and obtains a high-voltage capacitance value, and the other group is connected with a low-voltage capacitor electrode in parallel and obtains a low-voltage capacitance value; the processing control module is used for receiving the high-voltage capacitance value and the low-voltage capacitance value, judging whether the ratio of the high-voltage capacitance value to the low-voltage capacitance value exceeds a preset threshold value or not, calculating a capacitance value needing to be compensated when the ratio exceeds the preset threshold value, and generating compensation information according to the capacitance value needing to be compensated; and the compensation intervention module comprises a plurality of compensation capacitors with different capacitance gradients, and is configured to receive the compensation information and connect the specified compensation capacitors in series according to the compensation information. Safe and stable operation of the capacitive voltage dividing assembly is ensured through the gas insulating medium, and the performance and reliability of the capacitive voltage transformer are improved through the adjusting system.

The invention discloses a capacitor voltage transformer harmonic error prediction method based on NRBO-BP, and belongs to the technical field of modeling prediction. The method comprises the steps of analyzing harmonic transmission characteristics, adjusting stray capacitance numerical values to simulate different operating environments, performing simulation to obtain harmonic error data, optimizing initial weight and bias of a BP neural network by using an NRBO algorithm, constructing a harmonic error prediction model, and finally predicting 2-60 times of harmonic errors by taking typical harmonic errors as characteristic parameters. The performance of the model is evaluated by adopting a mean absolute error, a root-mean-square error and a decision coefficient, wherein the NRBO algorithm comprises the steps of population initialization, Newton-Raphson search and TAO trap avoidance; the method solves the problems of low model precision and susceptibility to environmental interference in the existing CVT harmonic error prediction, effectively improves the measurement precision of the CVT in the harmonic frequency band, and provides reliable technical support for harmonic analysis of a power system.

The invention discloses a capacitor voltage transformer transient voltage measurement method, device and equipment and a medium, and relates to the technical field of power grid transient voltage measurement, and the method comprises the steps: carrying out the piecewise linear fitting of a flux linkage-current curve of a CVT intermediate transformer, and obtaining a relation function of the piecewise current and the flux linkage; constructing a voltage numerical equation from the secondary side to the primary side of the CVT, wherein the voltage numerical equation considers ground distributed capacitance parameters of the CVT; and substituting the secondary side voltage value of the CVT collected in real time into the voltage numerical equation, and calculating the primary side voltage of the CVT in combination with the relation function of the segmented current and the flux linkage. According to the method, the primary side voltage of the CVT can be obtained according to the actually measured voltage value of the secondary side by constructing the voltage numerical value relation from the secondary side to the primary side of the CVT and combining the flux linkage-current relation curve, the transient response performance of the CVT is improved, and a technical basis is provided for power grid transient voltage measurement and related research.

The present invention belongs to the technical field of online monitoring of electric power metering and discloses a method and device for predicting capacitor voltage transformer errors. The method comprises: inputting capacitor voltage transformer error data before the current moment and capacitor voltage transformer environmental parameter data at the current moment into a pre-trained prediction model to obtain the capacitor voltage transformer error at the current moment; wherein the prediction model is obtained by inputting historical capacitor voltage transformer error data and capacitor voltage transformer environmental parameter data into an RBF neural network training. Beneficial effects: The method can predict capacitor voltage transformer errors, promptly detect when the capacitor voltage transformer metering error exceeds a limit, and help maintenance personnel understand the deterioration trend of the metering error.

The invention discloses a broadband harmonic voltage measuring system and method based on an improved CVT, and the system comprises a first current sensor which is used for measuring the first current of a high-voltage capacitor of the CVT; the broadband harmonic wave acquisition device is used for sampling the first current to obtain first current sampling data; and the broadband harmonic analysis device is used for determining an amplitude frequency spectrum of the first current based on the first current sampling data and determining each frequency component of the system voltage based on the amplitude frequency spectrum of the first current. On the basis of a large number of CVTs used in a power system, the broadband harmonic voltage measurement function within the range of hundreds of kHz is achieved by improving the CVT, the original power frequency measurement function of the CVT is not changed, the operation reliability of the CVT is not reduced, and effective broadband, high-precision and low-cost harmonic voltage measurement can be achieved.

The invention discloses a transformer substation capacitor voltage transformer operation and maintenance method and system, and the method comprises the steps: collecting the data of a capacitor voltage transformer in a transformer substation, so as to construct a group data set; according to the group data set, establishing a collaborative operation and maintenance target distribution model to obtain a plurality of collaborative operation and maintenance target distribution schemes in the same time period; establishing a scoring model, and scoring the plurality of collaborative operation and maintenance target allocation schemes; according to the multiple cooperative operation and maintenance target allocation schemes and the scores thereof, based on the cooperative operation and maintenance target allocation model, determining an optimal allocation scheme of the cooperative operation and maintenance targets in each time period; and splicing the optimal allocation schemes of the cooperative operation and maintenance targets according to a time period sequence to obtain an operation and maintenance scheme of the transformer substation capacitor voltage transformer. According to the method, personnel arrangement is reasonably distributed from the aspects of time sequence, space and the like, so that the workload of personnel is reduced, the operation and maintenance efficiency is improved, the defective CVT can be found as early as possible, and the standardization of operation and maintenance management is realized.

The invention provides a hooking system for a capacitor voltage transformer test. The hooking system comprises a base, a lifting device, a first rotary telescopic device, a first hook, a first patch cord and a control module, the lifting device is used for driving the first rotary telescopic device to ascend and descend in the vertical direction. The first rotary telescopic device is used for driving the first hook to rotate in the vertical direction and driving the first hook to stretch out and draw back in the horizontal direction. The first end of the first patch cord is arranged on the base, and the second end of the first patch cord is connected with the first hook; and the control module is used for controlling the lifting device and the first rotary telescopic device, so that the first hook is hooked at a target position of the capacitor voltage transformer. According to the hooking system for the capacitor voltage transformer test, mechanical adjustment of the spatial position of the first hook is realized, so that the first hook is efficiently and safely hooked at the target position of the capacitor voltage transformer.

The utility model belongs to the technical field of capacitance type voltage transformers, and relates to a capacitance type voltage transformer terminal box structure which comprises a terminal box body welded on an electromagnetic unit, a leading-out terminal board is arranged in the terminal box body, and an internal lead of the electromagnetic unit is connected out through the leading-out terminal board and then is connected with the terminal box body. The connector bar is fixedly connected into the terminal box body; a first cable clamping sleeve is arranged at the bottom of the terminal box body, and a terminal cable for measurement and protection is connected to a connector bar through the first cable clamping sleeve when the terminal box is used; and a terminal box flange constructed at the opening end of the terminal box body adopts a U-shaped flanging structure. According to the terminal box structure, metering terminals and measuring and monitoring terminals are separately arranged, and an independent metering terminal box is additionally arranged; the phenomenon of messy wiring of the secondary winding is improved, so that the wiring of the capacitor voltage transformer is more convenient and accurate; the sealing structure of the terminal box is optimized, the terminal box has better waterproof, high-humidity-proof and dustproof effects, and the use reliability of the terminal box is improved.

The invention discloses a capacitor voltage transformer state monitoring method and device, equipment, a storage medium and a product, and relates to the technical field of fault diagnosis, and the method comprises the steps: collecting the operation state data, including a plurality of sub-operation state data, of each capacitor voltage transformer in real time; comparing the sub-operation state data with the corresponding sub-reference state data to obtain a first comparison result, and if the value of the sub-operation state data is greater than a corresponding threshold value, determining that a fault risk exists; otherwise, determining a fault characteristic value through the multiple sub-operation state data, and judging whether the fault characteristic value is greater than a fault threshold value or not to determine whether a fault risk exists or not. The fault feature value is determined by firstly determining each sub-feature value and then integrating the sub-feature values. After a fault risk exists, a priority value to be detected is obtained, a surface image of the largest value is shot, an abnormal part is analyzed and determined, and analysis comprises the steps of image segmentation, part image and reference image comparison and the like. The method can accurately diagnose faults and position abnormal parts.

The utility model belongs to the technical field of voltage transformers, and particularly relates to a capacitive voltage transformer, which comprises an oil tank and a transformer main body arranged on the upper surface of the oil tank, and is characterized in that the top of the oil tank and the top end of the transformer main body are fixedly sleeved with connecting discs through bolts; the two connecting plates are symmetrically arranged up and down, the connecting plates are installed on the two sides of the two connecting plates, the connecting plates are each provided with three sets of buffering and reinforcing devices from top to bottom, and the buffering and reinforcing devices are used for buffering and reinforcing the surface of the transformer body, so that the wind resistance is high, and the situation that the transformer body is damaged when encountering strong wind weather is avoided. And the capacitor voltage transformer is easy to break.

The invention provides a capacitor voltage transformer excitation characteristic test method based on model predictive control, which optimizes a voltage scanning strategy by constructing a model predictive optimization controller and adopting a model predictive control technology, can reduce the number and time of point-by-point scanning on the premise of ensuring the test precision, and improves the test efficiency. And the test efficiency is improved. By calculating the optimal control strategy in real time, the excessive voltage applied to the equipment in the test process is reduced, so that the overheat risk of the capacitor voltage transformer is reduced, the equipment is prevented from being damaged, and the long-term healthy operation of the equipment is ensured. The position of the inflection point is judged through the distortion coefficient, the demarcation point of the nonlinear area and the linear area of the capacitor voltage transformer can be accurately determined, an accurate excitation characteristic curve can be drawn through the least data points, and a large amount of time and resources in a traditional detection method are saved. The method is suitable for detection and health assessment of the capacitor voltage transformer.

The invention relates to the technical field of online monitoring of capacitor voltage transformers, in particular to a calibrator and method for an online monitoring device of a capacitor voltage transformer, the calibrator comprises a difference adding module, an algorithm module and a judgment module, the difference adding module generates a plurality of groups of differential voltage signals, inputs the differential voltage signals into the online monitoring device and forms parameter vectors to be estimated; the algorithm module obtains a related voltage amplitude calculation theoretical ratio error, and constructs a hybrid optimization algorithm in combination with a Markov chain Monte Carlo method and a simulated annealing algorithm to calculate a posterior probability density so as to obtain the uncertainty of an error measurement result; and the judgment module combines the historical average uncertainty, the real-time temperature and the use year of the online monitoring device to calculate a verification parameter, compares the verification parameter with a preset threshold value and outputs an abnormal judgment result. According to the invention, non-power-cut verification can be realized, the verification efficiency and accuracy are improved, and the reliability of power supply of a power grid is guaranteed.

The embodiment of the invention discloses a capacitor voltage transformer with a change-over switch, a measuring method and a measuring system.The capacitor voltage transformer with the change-over switch comprises a capacitor unit, a lower end oil tank, a change-over switch controller and an electromagnetic unit installed in the oil tank, the electromagnetic unit comprises an intermediate transformer, a lightning arrester, a damping device, a first change-over switch, a second change-over switch and a compensation reactor, the change-over switch controller is externally connected with the oil tank, and the change-over switch controller controls the closing state of the first change-over switch and the closing state of the second change-over switch. According to the invention, the change-over switch is arranged in the capacitive voltage transformer, so that the measurement and maintenance of part of elements of the electromagnetic unit can be safely and conveniently carried out under the condition that the normal operation of the capacitive voltage transformer is not influenced, thereby improving the measurement efficiency and accuracy.

The utility model discloses an MCU control module suitable for a capacitor voltage transformer, and the MCU control module comprises a host MCU and a slave MCU, and the host MCU and the slave MCU support wireless or wired communication. A host MCU chip (STM32L431RCT6) and a host clock circuit are arranged in the host MCU, and the slave MCU is provided with a slave MCU chip (also STM32L431RCT6) and a slave clock circuit. According to the design, accurate control and monitoring of the capacitor voltage transformer are achieved through efficient MCU cooperative work, and the operation efficiency and safety of a power system are improved.

The application discloses a kind of 110kV capacitor voltage transformer does not remove lead test method, comprising, by through-type current transformer, the test current flowing through primary lead is converted into secondary current;Utilize negative feedback amplification circuit to amplify the secondary current of the through-type current transformer, and the through-type current transformer is shielded and protected by full metal shield cover;The amplified through-type current transformer is connected into Xilin bridge, and the main capacitance, the voltage dividing capacitance, the main capacitor dielectric loss factor and the voltage dividing capacitor dielectric loss factor of the through-type current transformer are calculated.The application does not need to remove and restore high voltage lead, does not need high place operation, work intensity is greatly reduced, eliminates the risk of falling in high place operation;At the same time, accurate measurement of capacitance and dielectric loss can be realized.

The utility model relates to a secondary junction box for independently leading out a metering winding of a capacitor voltage transformer, which is characterized in that an outer door plate assembly is arranged on the outer side of a secondary junction box body, an inner partition plate assembly is arranged inside the secondary junction box body, and the inner partition plate assembly comprises an inner partition plate, an inner door plate and an inner door plate locking assembly; a metering winding wire outlet hole in the wire outlet holes is arranged on one side of the first box body side plate close to the secondary junction box body, the inner partition plate is arranged between the metering winding wire outlet hole and the adjacent wire outlet hole, one end of the inner door plate is hinged to one end of the inner partition plate, and the other end of the inner door plate is locked on the inner side of the first box body side plate through an inner door plate locking assembly. The outer door plate assembly comprises an outer door plate and an outer door plate locking assembly, one end of the outer door plate is hinged to the outer side of the second box body side plate on the other side of the secondary junction box body, and the other end of the outer door plate is locked to the outer side of the first box body side plate through the outer door plate locking assembly. According to the utility model, while the metering winding wiring cable is led out independently, the inspection and maintenance of each cable can be realized conveniently.

The embodiment of the invention discloses an excitation voltage determination method for monitoring the deformation of a transformer winding, and the method comprises the steps: controlling a capacitor voltage transformer to sequentially inject excitation signals with different excitation voltage values into a transformer, and determining the deformation of the transformer winding based on the change of the inductance value of the winding measured after the injection of the different excitation voltage values; the slope and the target slope value are sequentially determined by combining the change of the excitation voltage value, and finally the optimal excitation voltage is determined according to the excitation voltage values of the excitation signals injected for two adjacent times corresponding to the target slope value, namely the most suitable excitation voltage is determined by adopting a quantization mode. The determined excitation voltage is prevented from being affected by subjectivity and uncertainty, so that the determined excitation voltage can accurately reflect the winding deformation state of the transformer, the accuracy and reliability of a monitoring result are improved, the risk of misjudgment is effectively reduced, the effectiveness and precision of monitoring are improved, and the monitoring accuracy is improved. Therefore, stable operation of the power system is ensured.

The invention relates to a capacitive voltage transformer for a converter station of an extra-high voltage direct current transmission project, which is characterized in that a secondary coil A, a secondary coil B and a secondary coil C in a secondary winding of an intermediate transformer have the same wire diameter, and when the secondary winding is wound, a secondary residual coil is wound on an insulating paper tube; the da end of the secondary residual coil is led out from the head end of the insulating paper tube, the dn end of the secondary residual coil is led out from the tail end of the insulating paper tube, then a secondary coil D is wound on the secondary residual coil, the 4a and 4n ends of the secondary coil D are led out from the tail end of the insulating paper tube, and then a secondary coil A, a secondary coil B and a secondary coil C are simultaneously wound on the secondary coil D in parallel, and 1a and 1n ends of the secondary coil A, 2a and 2n ends of the secondary coil B and 3a and 3n ends of the secondary coil C are led out from the head end of the insulating paper tube. The method has better accuracy performance and higher overvoltage bearing capacity, and can meet the use requirements of the converter station of the extra-high voltage direct current transmission project.

The invention discloses a primary side defect detection method and device of a capacitor voltage transformer and terminal equipment, and belongs to the field of capacitor voltage transformers, and the method comprises the steps: collecting a secondary voltage waveform signal of the capacitor voltage transformer in a target transformer substation; detecting the waveform amplitude change of the secondary voltage waveform signal, and screening according to the waveform amplitude change to obtain a target abnormal capacitor voltage transformer with voltage waveform abrupt change; and finally, positioning a target area in which the secondary voltage waveform signal of the target abnormal capacitor voltage transformer has voltage waveform mutation, and according to the secondary voltage waveform signal in the target area, judging whether voltage steering exists in the target area, and judging whether the target abnormal capacitor voltage transformer has the primary side defect or not. By implementing the method and the device, the problem that the primary side defect of the electromagnetic unit of the capacitive voltage transformer cannot be identified in the prior art can be effectively solved.

The utility model discloses a wired synchronization module suitable for a capacitor voltage transformer. The wired synchronization module comprises a synchronous current detection circuit and a sequential circuit. The synchronous current detection circuit utilizes a current detection chip U1, receives 3.3 V working voltage synchronous signals through a signal input pin VI of the current detection chip U1, and outputs current detection signals to a VREF end through a signal output pin VO. The capacitor C1 and the capacitor C2 are respectively connected in series between the grounding pin GND and the signal input pin VI and between the grounding pin GND and the signal output pin VO to play a filtering role. The sequential circuit comprises a connector J1, an array resistor, a reverse protection diode D1 and two operational amplifier comparators U2 and U3. The operational amplifier comparator U2 and the operational amplifier comparator U3 further process the current detection signal and finally output a synchronizing signal through a 220SYNC line. According to the design, the precision of clock synchronization is improved, the anti-interference capability of the module is enhanced, and the stability and the reliability of a capacitor voltage transformer system are ensured.