44 results about "Capacitive voltage divider" patented technology

The invention provides an electric energy quality on-line monitoring device and a cloud platform cooperation system, and relates to the technical field of electric energy quality management, and the device comprises a signal collection unit which obtains three-phase voltage and current signals in parallel through a Rogowski coil and a capacitive voltage divider; the event detection unit is used for synchronously executing harmonic spectrum analysis and transient event capture by adopting a parallel processing architecture realized by an FPGA (Field Programmable Gate Array); the edge processing unit is connected with the event detection unit, and is configured to encode the transient event features into a Gramer angle field image and compress steady state data into feature vectors; the multimode communication unit comprises a 4G / 5G wireless module and an optical fiber Ethernet interface; and the strategy execution interface outputs a treatment instruction to the compensation device through the D / A converter and the current loop. Through collaborative innovation of the device and the cloud platform, the power quality monitoring and treatment efficiency is remarkably improved.

The application discloses a kind of transformer intelligent enclosed neutral point protection devices, including maintenance switch, lightning arrester, capacitive voltage divider, filter module, isolation transformer, charge-discharge module, voltage detection module, gap discharge unit, digital control unit;Filter module is used to filter the voltage signal of capacitive voltage divider after voltage division flows into isolation transformer, removes high-frequency signal, retains power frequency or its multiple frequency signal, realizes the distinction of transient overvoltage signal and steady overvoltage signal;Voltage detection module is used to detect the voltage amplitude of four capacitors in charge-discharge module, duration, and real-time transmission detection data to digital control unit, and digital control unit real-time uploads detection data to main control background, control pulse trigger controllable switch opens or closes, control discharge of enclosed discharge gap.The application realizes the accurate identification of transformer neutral point overvoltage type, solves the problem of high misoperation rate of existing device, damage transformer.

The application discloses a standard capacitance voltage divider for measuring wide-range voltage and a measuring method. The standard capacitance voltage divider for measuring wide-range voltage comprises an insulating outer cylinder, an electrode module arranged at the upper end inside the insulating outer cylinder and a low-voltage arm module arranged at the bottom outside of the insulating outer cylinder. The electrode module comprises a high-voltage electrode, a low-voltage electrode and a shielding electrode. The high-voltage electrode, the low-voltage electrode and the shielding electrode are coaxially combined. The lower end of the shielding electrode is connected with a lower flange arranged at the bottom of the insulating outer cylinder through a supporting rod. The low-voltage arm module comprises a low-voltage arm external box and a low-voltage arm. The low-voltage arm external box is fixed at the lower end of the lower flange. The low-voltage arm is arranged in the low-voltage arm external box. The wide dynamic voltage can be reliably and accurately measured.

The invention relates to a broadband low-inductance ohmic-capacitive voltage divider (1) for a partial discharge measurement, having at least one first part (T1) and at least one second part (T2), wherein the first part (T1) and the second part (T2) are connected in series in order to serve as a voltage divider (1), an inductively based partial discharge measuring device (TEL) i. is integrated into the first part (T1) or the second part (T2) or ii. is provided between the first part (T1) and the second part (T2), and the ohmic elements as well as the capacitive elements of the first part (T1) and of the second part (T2) are adapted to one another such that a low-impedance current flow through the partial discharge measuring device at a frequency which differs from the grid frequency and which is higher than 150 KHz is made possible.

A capacitive level sensor (10) for measuring the level (H1, H2; H1', ​​H2') of a medium (16) in a container (14), comprising an electrode unit (12) comprising a strip-shaped measuring electrode (22), a strip-shaped counter electrode (24), and a strip-shaped shielding electrode (26, 28, 40), wherein the shielding electrode (26, 28, 40) at least partially surrounds the measuring electrode (22), and a signal processing arrangement (46), characterized in that a first AC voltage source (60) with a predetermined frequency and amplitude is provided, to which the shielding electrode (26, 28, 40) is connected, such that a shielding capacitor (54, 56) formed between the shielding electrode (26, 28, 40) and the measuring electrode (22) 58) has a shielding capacitance that is proportional to the length of the shielding electrode (26, 28, 40), that a second AC voltage source (66) of the same frequency and with a predetermined second amplitude is present,wherein the second amplitude is out of phase with the first amplitude to which the counter-electrode (24) is connected, such that a measuring capacitor (52) formed between the counter-electrode (24) and the measuring electrode (22) has a measuring capacitance that is proportional to the fill level (H1, H2; H1', ​​H2'), that the measuring capacitor (52) and the shielding capacitor (54, 56, 58) are connected to form a capacitive voltage divider, and that the divided measuring electrode voltage (72) applied to the measuring electrode (22) is used to determine the fill level (H1, H2; H1', ​​H2') in the signal processing arrangement (46).

An amplifier circuit that includes a capacitor voltage divider that is selectively enabled with a switch. The circuit includes two capacitor banks where the banks are electrically coupled to opposing side terminals of the switch. When the capacitor voltage divider is not enabled, one bank is adjusted to control the gain of the amplifier. When the capacitor voltage divider is enabled, both banks are used to control the gain of the amplifier.

The invention discloses a 10kV pole-mounted switch primary and secondary fusion voltage and current integrated sensor, and belongs to the technical field of power system sensing. The sensor adopts a conformal implantable design, an electric field coupling capacitance voltage division type voltage sensing unit and a single-turn through type LPCT are integrated at a pole-mounted switch wire inlet end, and non-contact measurement of voltage and current is realized. The voltage sensing unit optimizes a low-voltage arm circuit through a secondary active capacitive voltage divider, the current sensing unit adopts a single-turn through type LPCT to realize high-precision current acquisition, and the whole body is encapsulated by solid epoxy resin to form a totally-enclosed insulation structure. The problems that a traditional mutual inductor is large in size, low in integration level, complex in insulation and difficult to achieve distributed installation are solved, and the transformer has the advantages of being small in size, integrated, high in insulation and high in reliability. And the requirements of primary and secondary fusion of the 10kV pole-mounted switch and intelligent development of power distribution network equipment on harmonic wave capture, distributed installation and wide-area deployment can be met.

The application relates to a dielectric loss measurement error correction method and device for a capacitive voltage transformer. The method comprises the following steps: constructing a dielectric loss measurement equivalent analysis circuit based on a dielectric loss equivalent circuit as a target circuit model; the target circuit model is used for quantitatively calculating dielectric loss test data of the capacitive voltage transformer under the influence of an interference branch; obtaining a target expression set corresponding to the target circuit model, and obtaining a first dielectric loss value and a first capacitance parameter corresponding to an electromagnetic unit in the capacitive voltage transformer according to the target expression set; determining a dielectric loss measurement correction result as corrected dielectric loss data corresponding to a capacitance divider in the capacitive voltage transformer according to test current parameter information measured under preset test conditions, the first dielectric loss value and the first capacitance parameter. The method can correct the dielectric loss measurement error of the capacitive voltage transformer, and improves the dielectric loss measurement accuracy of the capacitive voltage transformer.

A schematic diagram of a wideband measurement system for mixed-connected CVT based on an optical voltage sensor is provided. The wideband measurement system comprises a CVT power frequency measurement section and an optical wideband measurement section. In the optical wideband measurement section, a low-voltage capacitor is connected in series between the low-voltage terminal and the ground terminal of the medium-voltage capacitor in the capacitor voltage divider. An optical voltage sensor is connected in parallel across the terminals of the low-voltage capacitor to measure the wideband voltage signal under test. The wideband measurement system for mixed-connected CVT described in the invention enables the CVT to have wideband measurement capabilities while ensuring the accuracy of conventional CVT power frequency measurements.

1. A memory device for storing data, comprising: a voltage divider circuit comprising at least one memory element, the at least one memory element operable or selected to be in a resistance and / or impedance state representative of at least a portion of the data, the voltage divider circuit configured to divide a voltage in response to the resistance and / or impedance state of the at least one memory element as part of a data read and / or data write operation, the at least one memory element being capacitive and connected to one or more further capacitive elements such that the voltage divider circuit comprises a capacitor divider configuration.

The invention provides a winding method of a CVT capacitive voltage divider and a winding system based on the CVT capacitive voltage divider, and the method comprises the steps: S10, obtaining a first aluminum foil and a second aluminum foil, and carrying out the double-side edge folding processing of the first aluminum foil and the second aluminum foil; s20, laminating the first aluminum foil subjected to edge folding treatment, first capacitor paper and a first lower isolating membrane to form a first aluminum foil membrane group; s30, laminating the second aluminum foil subjected to edge folding treatment with a first upper isolating membrane, second capacitor paper and a second lower isolating membrane to form a second aluminum foil membrane group; and S40, after the second upper isolation film is clamped by the opposite compression roller, the second aluminum foil film group and the first aluminum foil film group are stacked and wound on the capacitor winding shaft. According to the winding method of the CVT capacitive voltage divider provided by the invention, the capacitor roll can obtain better tightening force in a mode of laminating the two aluminum foil film groups through the second upper isolating film, and the two aluminum foil film groups do not need to bear excessive tension, so that the wound capacitive voltage divider is shaped and is not easy to deform.

The invention discloses a full-band sensor and a full-band detection device.The full-band sensor comprises an HFCT layer set, an antenna layer set and a shielding layer set, the HFCT layer set comprises sensing units and a base body, a plurality of grooves are formed in the base body, the sensing units are installed in the corresponding grooves, and the multiple sensing units are sequentially connected in series to form a winding; the antenna layer group comprises a first insulating layer and a first conductor layer, the first insulating layer and the first conductor layer are stacked, and a first conductive pattern is arranged on the first conductor layer; the shielding layer group comprises a second insulating layer, a third insulating layer and a second conductor layer, the base body, the second insulating layer, the second conductor layer, the third insulating layer and the first conductor layer are sequentially stacked, the second conductor layer is provided with a copper layer, and the capacitive voltage divider is formed among the second conductor layer, the third insulating layer, the first conductor layer, the first insulating layer and the iron core. According to the invention, synchronous acquisition of high-frequency partial discharge, ultrahigh frequency, overvoltage, common frequency and harmonic signals thereof is realized.

The utility model provides a kind of 3VA ultra-low power consumption's primary and secondary depth fusion device, including primary switch and FTU controller, primary switch is built-in for the pole of capacitor power taking, and its power side and load side are connected with the output end of a pole respectively;Capacitor power taking module is arranged in pole, and capacitor power taking module includes capacitor voltage divider and electromagnetic unit, one end of the high voltage capacitor of capacitor voltage divider is connected with the high voltage terminal of primary switch, and the other end is connected with the low voltage terminal of primary switch by low voltage capacitor, and the medium voltage capacitor tap of high voltage capacitor and low voltage capacitor is connected with the input end of electromagnetic unit, and electromagnetic unit provides matching inductive compensation output standard 24V low-voltage alternating current.The utility model reaches the effect of easy installation and maintenance, efficient electric energy conversion, low-power operation and self-adapting power management by setting the pole of built-in capacitor power taking in primary side and the power management module of FTU controller.

A device for protecting, controlling and monitoring an electrical medium range switching device, the device comprising the use of a Rogowski coil embedded within a bottle of the switching device, and the bottle surrounding the flow of voltage and current of a main power source, a capacitive or similar voltage divider also surrounding the main power source and extending around the bottle, an analog signal is provided from these devices to an integrated circuit for conversion into a digital signal, and then the digital signal is passed as an output to a digital collector in which the digital signal is optionally time-stamped and compared to other signals, standard values or own signals at different times.

This application relates to the field of power equipment condition monitoring technology, specifically to a distributed voltage sensing probe, system, and method for dry-type air-core reactors. The probe includes: an annular insulating shell adapted to surround the reactor coil; an induction plate disposed inside the annular insulating shell for coupling with the electric field on the surface of the coil to form a coupling capacitor; and a signal processing module disposed inside the annular insulating shell, which includes a precision voltage-dividing capacitor forming a capacitive voltage divider circuit with the coupling capacitor. The probe, through the capacitive voltage divider circuit, proportionally converts the high voltage of the coil into a low-voltage signal characterizing the voltage of the coil relative to ground or between coils. This ability to proportionally convert the high voltage of the coil into a low-voltage signal characterizing its voltage relative to ground or between coils provides a direct voltage monitoring means for early fault detection inside the reactor, and the probe's adaptability design conforms to the shape of the coil, ensuring the stability of the voltage sensing.

The invention relates to a method for determining a state of a capacitive voltage transformer (50) comprising a capacitive voltage divider with a first capacitor (C1) and a second capacitor (C2) on its primary side. The first capacitor (C1) has a high voltage connection (HV) for connecting to a high voltage (60) and the second capacitor (C2) has a ground connection (NHF). A first resonance frequency (ω e ) is determined by a plurality of first short circuit impedance measurements at different frequencies on the secondary side of the capacitive voltage transformer (50) with the high voltage connection (HV) grounded (70). A second resonance frequency (ω2) is determined by a plurality of second short circuit impedance measurements at different frequencies on the secondary side of the capacitive voltage transformer (50) with the high voltage connection (HV) open. A capacitance ratio (K e ) of the capacitive voltage divider (50) is determined based on the first resonance frequency (ω C ) and the second resonance frequency (ω2).

The present application relates to the technical field of high-voltage measuring device of electric multiple unit power system, and particularly relates to a capacitive voltage transformer for electric multiple unit. The voltage transformer is formed into an integrated full-enclosed main insulator by epoxy resin vacuum casting, and the primary high-voltage terminal is a stepped round table type standard C head structure. The inside is composed of a high-voltage capacitor and a low-voltage capacitor to form a capacitive divider, cooperate with a reactor to realize impedance compensation, cooperate with a damper to suppress resonance and overvoltage, and set a protection gap to realize overvoltage protection, and all wiring terminals are arranged in a sealed secondary wiring table. The present application has the advantages of capacitive voltage division and electromagnetic measurement, has the characteristics of small size, flexible installation, anti-resonance, anti-interference, high precision, strong protection, maintenance-free, etc., can adapt to the compact space and harsh operating environment of electric multiple unit, and is suitable for high-voltage measurement and relay protection system of electric multiple unit.

The invention relates to a capacitive voltage transformer for a capacitor test tower, which comprises a capacitive voltage divider and at least one electromagnetic unit, a medium-voltage lead-out wire of the capacitive voltage divider is electrically connected with a medium-voltage lead-out sleeve, and a measurement lead-out wire is electrically connected with a measurement lead-out terminal. The medium-voltage lead-out sleeve is electrically connected with the medium-voltage lead-in sleeve on the corresponding electromagnetic unit, and the measurement lead-out terminal is electrically connected with the measurement lead-in terminal on the corresponding electromagnetic unit; an intermediate transformer in the electromagnetic unit comprises a primary coil and a secondary coil, the head end of the primary coil is connected with a medium-voltage lead-in sleeve, the primary coil further comprises a primary coil tail end terminal and a plurality of adjusting terminals, and a compensation reactor coil comprises a coil head end terminal and a plurality of turn number adjusting terminals. All the terminals are led out by the error adjusting box; the measurement lead-in terminal is electrically connected with the harmonic measurement terminal. The test requirements of the 1000kV capacitor test tower can be met, and the measurement precision under different working frequencies can be ensured.

The invention belongs to the technical field of capacitive voltage dividers, and particularly relates to a capacitive voltage divider based on an operational amplifier, which comprises a high-voltage capacitor, a low-voltage capacitor, a shielding structure, the operational amplifier and a double-T-shaped resistance-capacitance network, the high-voltage capacitor and the low-voltage capacitor are connected in series; the shielding structure is grounded and is used for shielding electric field coupling between the high-voltage capacitor and the ground; the positive input end of the operational amplifier is grounded, and the inverted input end and the output end of the operational amplifier are connected to the two ends of the low-voltage capacitor respectively. High-voltage and low-voltage capacitor series nodes are virtually grounded through operational amplifier negative feedback, a feedback circuit is not needed to compensate shielding potential, and additional errors are thoroughly avoided; and meanwhile, a rear-end high input impedance design is not needed, so that the circuit complexity and the hardware cost are reduced.

The invention relates to a low-inductance and broadband resistive-capacitive voltage divider (1) for partial discharge measurement, comprising • At least a first part (T1) and • At least a second part (T2), • Where the first part (T1) and the second part (T2) are connected in series to serve as a voltage divider (1), • Whereby an inductively based partial discharge measuring device (TEL) i. integrated into the first part (T1) or the second part (T2), or ii. is arranged between the first part (T1) and the second part (T2), • wherein the ohmic elements as well as the capacitive elements of the first part (T1) and the second part (T2) are matched to each other in such a way that a low-impedance current flow through the partial discharge measuring device (TEL) is enabled at a frequency other than the mains frequency which is higher than 150 kHz.

The invention relates to a high-voltage experiment platform, in particular to a Marx gas switch high-voltage performance experiment test platform and test method, and solves the technical problem that the existing experiment platform cannot give consideration to the performance test of a trigger switch, the performance test of an overvoltage breakdown switch and the assessment requirements of components such as a high-voltage resistor and a capacitor. A trigger type switch experiment assembly is arranged in an oil tank to test the high-voltage performance of a gas switch in a single-stage equivalent test circuit; or the overvoltage breakdown type switch experiment assembly is arranged in the oil tank to test the high-voltage performance of the gas switch in the multi-stage Marx movement. According to the method, the jitter of the gas switch can be calculated by using the trigger pulse signal waveform measured by the resistance voltage divider and the loop current signal waveform measured by the Rogowski coil; a plurality of capacitive voltage dividers corresponding to each breakdown circuit of the multi-stage Marx movement on the two backflow plates are used for testing to obtain the conduction time of each gas switch, and then the jitter of each gas switch is calculated.

The invention discloses a multi-band adaptive resonance high-voltage test device and a diagnosis method, and belongs to the technical field of power system high-voltage tests, and the device comprises a high-frequency inversion module which is used for rectifying a power frequency alternating current and inverting the power frequency alternating current into a high-frequency excitation source; the adjustable reactor group is controlled to be switched on or switched off through an intelligent control relay matrix, and the total inductance value is adjusted in a series connection, parallel connection or series-parallel connection stepping mode; the distributed capacitive voltage divider adopts an integrated structure of a high-voltage arm capacitor and a low-voltage arm capacitor, and a non-inductive carbon core resistor and a high-speed signal conditioning circuit are arranged at the rear stage and are used for signal compensation and extraction; and the defect diagnosis module is used for performing end-to-end intelligent analysis and diagnosis on the acquired voltage and current signals. According to the invention, the optimal resonant frequency can be quickly and accurately locked and stabilized, the resonant stability and efficiency are remarkably improved, multi-band adaptive resonance is realized, and the universality and test efficiency of equipment are improved.

Disclosed is a capacitive non-directional coupler having a non-directional coupler printed circuit board (PCB) and a capacitive attenuator. The non-directional coupler PCB includes a coupler section configured to carry energy travelling on a main transmission line. The non-directional coupler PCB and the capacitive attenuator are configured as a capacitive voltage divider, and provide a sample of the energy on the main transmission line. Also disclosed is a method for measuring for measuring RF power using an RF power sensor having the capacitive non-directional coupler that includes with the non-directional coupler printed circuit board and the capacitive attenuator. Also disclosed is an RF power metering system that includes an RF power sensor having the capacitive non-directional coupler.

A MOV partial valve piece performance degradation early warning system and method, comprising: the voltage reduction function of the capacitor voltage divider arranged in the spark gap trigger auxiliary loop of the series compensation complete device converts the high voltage of the primary side MOV into low voltage of the secondary side, the low voltage signal of the secondary side is processed through the MOV voltage acquisition channel to obtain the MOV voltage; the current transformer CT in the MOV current loop converts the total circuit current of the primary side MOV and the MOV branch current into small current of the secondary side, the small current of the secondary side is processed through the MOV current acquisition channel arranged in the platform measurement box to obtain the total current of the MOV and the MOV branch current; the early warning analysis processing module takes the total current of the MOV, the MOV branch current and the MOV voltage as the criterion to early warn the performance degradation of the MOV partial valve piece based on the consistency of the volt-ampere characteristic. The present application realizes the prevention of MOV damage and guarantees the safety of the MOV.

The invention discloses a wide dynamic high-voltage power transformer processing method and system, and the method comprises the steps: adding a third-stage low-voltage side compensation capacitor C3 to form a three-stage voltage dividing structure on the basis of a two-stage capacitive voltage divider, a high-voltage side main capacitor C1 and an intermediate-stage capacitor C2 of a wide dynamic high-voltage power transformer CVT, the terminal of the third-stage low-voltage side compensation capacitor C3 is directly led out of a broadband output interface; a broadband output channel of a third-stage low-voltage side compensation capacitor C3 is provided with a signal amplification drive circuit, an adjustable gain analog circuit is adopted to process input parameters, and a high-voltage operational amplifier and a high-frequency isolation transformer are adopted to determine output parameters; a monitoring ADC collects temperature information, and active compensation and parameter fusion are carried out on output parameters according to a third-stage low-voltage side compensation capacitor C3 to obtain parameter compensation; and the secondary side output characteristics of the intermediate-stage capacitor C2 are kept unchanged, and based on parameter compensation, high-precision processing of wide dynamic output of the third-stage low-voltage side compensation capacitor C3 is realized through digital signals.

The invention discloses a system and a method for designing and processing a physical model of a capacitive voltage transformer for a dynamic simulation test, and belongs to the technical field of physical dynamic simulation tests of power systems. The system comprises a CVT internal structure and appearance design unit for testing, which is used for determining parameters of the internal structure and the appearance of the CVT; the capacitive voltage divider parameter calculation unit is used for calculating key parameters according to on-site CVT body parameters; the electromagnetic unit parameter calculation unit is used for determining electromagnetic unit parameters; the intermediate transformer design unit is used for determining the structure and electrical parameters of the intermediate transformer; the compensation reactor design unit is used for determining the structure and electrical parameters of the compensation reactor; and the modeling unit is used for building a physical model of the capacitive voltage transformer for the dynamic simulation test. The method can be suitable for large, medium and small test models, and provides a basis for related test verification.

The invention discloses an anti-explosion capacitive voltage transformer which comprises a metal expander, a capacitive voltage divider and an electromagnetic unit, the metal expander is of an external micro-positive pressure type structure and is installed at the top end of the capacitive voltage divider, an oil level gauge is arranged on the side face of the metal expander, and the electromagnetic unit is installed at the top end of the capacitive voltage divider. A protective cover is installed outside the metal expander, and an oil level observation window is formed in the position, corresponding to the oil level indicator, of the protective cover. The capacitive voltage divider comprises a capacitor core body and a porcelain bushing, the capacitor core body comprises a high-voltage capacitor and a low-voltage capacitor, the capacitor core body is sealed in the porcelain bushing, the capacitive voltage divider is filled with natural ester insulating oil, the electromagnetic unit is fixedly connected with the low-voltage capacitor end of the capacitive voltage divider, and the electromagnetic unit is filled with natural ester insulating oil. And the anti-explosion and monitoring performance of the equipment is fundamentally improved from two aspects of an insulating medium and a structural design.

The voltage generation system can include a resistive voltage divider having a first resistance connected between its output and a first feedback node, and having a second resistance connected between the first feedback node and a first voltage node; a capacitive voltage divider having a first capacitance connected between its output and a second feedback node, and having a second capacitance connected between the second feedback node and the first voltage node; a comparator having an input connected to the second feedback node; and a voltage generation circuit configured to generate a voltage level at its output in response to an output of the comparator and in response to a clock signal, wherein the first feedback node is selectively connected to the second feedback node and to a second voltage node, the first resistance is selectively connected to the first feedback node, and the second resistance is selectively connected to the first voltage node.

The invention relates to a low-inductance and broadband resistive-capacitive voltage divider (1) for partial discharge measurement, comprising • At least a first part (T1) and • At least a second part (T2), • Where the first part (T1) and the second part (T2) are connected in series to serve as a voltage divider (1), • Whereby an inductively based partial discharge measuring device (TEL) i. integrated into the first part (T1) or the second part (T2), or ii. is arranged between the first part (T1) and the second part (T2), • wherein the ohmic elements as well as the capacitive elements of the first part (T1) and the second part (T2) are matched to each other in such a way that a low-impedance current flow through the partial discharge measuring device (TEL) is enabled at a frequency other than the mains frequency which is higher than 150 kHz.

The application discloses a kind of capacitive capacity monitoring method and system of flexible direct current converter station bushing, it is related to the field of flexible direct current transmission equipment on-line monitoring and electrical parameter identification technique, including in the bushing of flexible direct current converter station bushing end screen and ground setting capacitor voltage divider and constructing series capacitor measurement structure, acquisition bushing primary voltage signal and end screen current.Primary voltage signal and end screen current are carried out synchronous signal preprocessing, using wavelet transform and filtering strategy to remove noise and extract frequency domain features.Capacitive capacity coupling relationship of bushing structure parameter is calculated based on frequency domain features, and abnormal point is judged by establishing capacitive capacity change identification model and combining temperature and humidity data.The method described in the application effectively overcomes the problems of static analysis lag, single variable misjudgment and insufficient frequency spectrum resolution, realizes real-time monitoring of flexible direct current bushing capacitive capacity, abnormal dynamic early warning and system improvement of model adaptability, and significantly enhances the safety operation guarantee capability of equipment throughout its life cycle.