183 results about "Dielectric spectrum" patented technology

The invention discloses a testing device for an oiled paper compound insulation frequency domain dielectric spectrum and conductivity test. The testing device comprises a high temperature resistance organic glass tank, an upper stainless steel sealing cover plate, a lower stainless steel sealing cover plate, electrode systems, an electric heating blanket, a temperature sensor, a temperature display and control device and the like. The upper end and the lower end of the tank are sealed with the stainless steel sealing cover plates, the tank is filled with transformer oil, the temperature sensor is arranged at the bottom of the tank, the temperature sensor is connected with the temperature display and control device, an air valve and an air pressure gauge are arranged on the upper cover plate of the tank, an oil valve is arranged on the lower cover plate, the electrode systems are arranged at the bottom of the tank, an insulation paper board is arranged between the upper electrode system and the lower electrode system, an upper electrode is connected with a thread micrometer, a measuring electrode in a lower electrode is insulated from a grounding electrode through a polytetrafluoroethylene casing pipe, and the grounding electrode is connected with the lower cover plate. According to the testing device for the oiled paper compound insulation frequency domain dielectric spectrum and conductivity test, a vacuum oiling way is adopted for achieving sufficient immersion of the insulation paper board and insulating oil, a heating device is applied outside the tank to set different environment temperatures, and the oiled paper insulation frequency domain dielectric spectrum and conductivity are accurately tested.

The invention comprises: a photoinduction dielectrophoresis chip, machine vision unit, a vision servo unit and a virtual electrode writing unit. Said photoinduction dielectrophoresis chip is located on a supporting unit and is used for placing the simple cell suspension; said photoinduction dielectrophoresis chip is a three layer hamburger structure; said three layer structure comprises a conducting glass layer, a micro channel layer and a photoinduction chip; on the conducting glass, respectively setting an inlet and an outlet.

The invention discloses a large-scale generator stator winding major insulation aging state test method based on frequency domain spectroscopy. The method includes the steps: making a generator stop running and be reliably disconnected from a circuit, and cooling the generator to an ambient temperature; testing wiring: connecting a stator winding of the generator with a high-voltage end of a test cable of a dielectric spectrum tester, and connecting a grounding end of a housing of a generator with a grounding end of the test cable of the dielectric spectrum tester; setting a parameter and starting a test; testing a frequency characteristic curve [epsilon]-f of a major insulation complex dielectric constant of the stator winding of the generator, and obtaining the dielectric loss factor increment [delta]tan[delta]N of the current major insulation through calculation by a formula; and evaluating the aging state of the major insulation of the stator winding of the generator according to the obtained dielectric loss factor increment [delta]tan[delta]N. The method is a non-destructive test method, has simple test principles, enables convenient wiring, can accurately determine the dielectric loss factor increment [delta]tan[delta]N of the stator winding of the generator, and thus can effectively evaluate the aging state of the generator.

The invention relates to the biological identification technology field and especially relates to an identity identification apparatus and a method thereof. The identity identification apparatus comprises a biological characteristic signal acquisition module, a biological characteristic extraction module and a biological characteristic identification module. The biological characteristic signal acquisition module is used for collecting a fingerprint image and a finger portion group delay curve. The biological characteristic extraction module is used for extracting a fingerprint characteristic value and a group delay characteristic value respectively according to the fingerprint image and the finger portion group delay curve. The biological characteristic identification module is used for constructing an identity identification model through a training sample set and carrying out cross validation on the extracted fingerprint characteristic value, the group delay characteristic value and the identity identification model through using a convolution nerve network algorithm so as to realize identity identification of a user. In the invention, through collecting a fingerprint characteristic of the user and finger portion dielectric spectrum characteristic information, the identity identification is performed; and through using a multimodal fusion identity identification algorithm based on a convolution nerve network, the identity identification is performed and identity identification accuracy is increased.

The invention discloses a method for estimating the low-frequency dielectric loss of a paper oil insulation system based on parameter identification. Firstly, an XY model is used for simulating the polar characteristics of the transformer paper oil insulation system, a paper oil insulation system XY model equivalent circuit is established, and a relation expression among the circuit parameter, the characteristic quantity complex capacitance and the dielectric loss factor of the XY model equivalent circuit is established; a frequency domain dielectric spectrum method is used for measuring the complex capacitance and the dielectric loss factor of the paper oil insulation system of a field transformer; parameterization is conducted on the equivalent circuit model through the measured complex capacitance of the high-frequency section and the dielectric loss characteristic quantity, and a mathematical optimization model of parameter estimation is established; an improved particle swarm optimization algorithm is used for distinguishing the parameter value of the XY model equivalent circuit with four polar branch circuits; finally, the distinguished parameter value of the XY model equivalent circuit is used for calculating the complex capacitance and the dielectric value of the low-frequency section of the paper oil insulation system, and a frequency domain dielectric spectrum in a wide range is obtained. According to the method for estimating the low-frequency dielectric loss of the paper oil insulation system based on parameter identification, the paper oil insulation state of the large power transformer can be rapidly estimated based on the frequency domain dielectric spectrum method.

The invention provides a bushing oil-impregnated paper insulating frequency domain dielectric spectrum experiment system and a bushing oil-impregnated paper insulating frequency domain dielectric spectrum experiment method at a non-uniform temperature. The system comprises an experiment box, an oil-impregnated paper insulating temperature control system, an insulated oil box with a heating device, a 12V DC power supply, a connecting device between the experiment box and the insulated oil box, an acquiring and control system, a dielectric response tester, a switch control system and a computer. The method comprises the steps of starting the acquiring and control system so that insulating oil is circulated in an oil path, thereby keeping a constant oil temperature of the insulating oil in the experiment box; switching on the 12V DC power supply for heating to a Curie temperature; starting the dielectric response tester, performing frequency domain dielectric spectrum testing on the bushing oil-impregnated paper insulation at the non-uniform temperature by means of the switch control system, receiving data uploaded from the dielectric response tester by a computer, and performing corresponding storage and analysis. The system and the method provided by the invention can perform frequency domain dielectric spectrum testing on the bushing oil-impregnated paper at the non-uniform temperature, thereby researching the dielectric characteristic of the bushing oil-impregnated paper insulation at an actual working condition temperature.

The invention discloses an annular arrangement type multi-needle biological tissue dielectric spectrum characteristic measuring probe, which comprises a base, wherein a plurality of needle type electrodes, a change-over switch and an excitation end and measuring end interface are arranged on the base; the plurality of needle type electrodes are arranged on two concentric circles of an inner ring and an outer ring formed on the base at equal interval and is perpendicular to the base to serve as excitation electrodes and measuring electrodes; and the electrodes of the same function are internally connected through copper wires on the base and are connected with the excitation end and measuring end interface through the change-over switch. The probe also comprises a calibration box which is matched with the probe for use. The invention also discloses an implementation method for biological tissue dielectric characteristic measurement by using the probe. The problem of strict requirement on shapes of tissues to be measured by the conventional measuring device is effectively solved, so that the electrical impedance measurement on the tissues of irregular shapes or the tissues difficultto cut is made possible.

The invention provides an open-ended coaxial probe and connection cable for measuring a dielectric spectrum property of biological tissues, and a corresponding instrument calibration method according to high-precision and wide-broadband measurement requirements on the dielectric property of in-vitro or in-vivo biological active tissues which are soft, small in volume and irregular in appearance. The open-ended coaxial probe comprises an inner conductor and an outer conductor which are concentrically arranged; the ratio of the radius of the inner conductor to the radius of the outer conductor is 3: 10; polytetrafluoroethylene is filled between the inner conductor and the outer conductor and a plating layer is arranged on the surface of the outer conductor. The connection cable is mainly composed of an N-type connector and a coaxial cable. The probe is calibrated by utilizing a phase cancellation method and is used for measuring the dielectric property of the biological active tissues at 1-200 MHz. Meanwhile, in order to increase the reliability of measured data, a calibration box which is used with the open-ended coaxial probe is provided; and a method for measuring the dielectric property of the biological tissues can be carried out by using the open-ended coaxial probe.

The invention discloses an oil paper insulation water content evaluation method based on polarization loss and electric conduction loss. The method comprises the following steps of 1, performing frequency domain dielectric spectrum test preparation; 2, solving relevant parameters of an oil soaking insulation paper board expansion Debye model conforming to the frequency domain dielectric spectrum matching requirements, so that the spectrum unscrambling of the oil soaking insulation paper board frequency domain dielectric spectrum test is completed; 3, calculating the electric conduction loss and the polarization loss of the oil soaking insulation paper board on the basis of the complex capacity test spectrum unscrambling result of the frequency domain dielectric spectrum of the oil soaking insulation paper board; 4, respectively making frequency curves of the electric conduction loss and polarization loss according to the electric conduction loss and the polarization loss, obtaining the intersecting point frequency of the two curves, and calculating the water content of the oil soaking insulation paper board through the intersecting point frequency of the frequency curves of the electric conduction loss and polarization loss. The problems that the reliability of an oil paper insulation water content evaluation method based on the physicochemical properties in the prior art is insufficient, and the measurement frequency band of the time domain dielectric response technology is narrow, the interference by the environment is obvious, and the like are solved.

The invention discloses a method for quickly detecting the fat content of bovine milk based on a dielectric spectrum technique. According to the method for quickly detecting the fat content of the bovine milk based on the dielectric spectrum technique, dielectric spectrums (relative dielectric constant spectrums and dielectric loss factor spectrums), in certain one radio-frequency / microwave range of one batch of bovine milk samples are obtained by utilizing a network analyzer (or an impedance analyzer) and a coaxial probe; characteristic dielectric variables which express the fat content of the bovine mink are extracted from the dielectric spectrums; linear or nonlinear detection models for detecting the fat content of the bovine milk are established based on the dielectric spectrums in the whole radio-frequency / microwave range or the extracted characteristic dielectric variables; the models are inspected; the model of which the prediction-set root-mean-square error is minimal is used as an optimal model for detecting the fat content of the bovine milk. The dielectric spectrum of a bovine milk sample of which the fat content is unknown is measured; the numerical values of the characteristic dielectric variables are substituted into the optimal model, so that the fat content of the sample can be calculated. The method for quickly detecting the fat content of the bovine milk based on the dielectric spectrum technique has the advantages that the detection is convenient and quick, the operation is simple, the precision is high, and the on-line and real-time detection can be realized.

Firstly, a shape of a cell as an object of a measurement is modeled, and a complex electric permittivity response when an AC electric field is applied to the cell is obtained through a numerical analysis (Step S1). A numerical calculation is carried out based on that result while values of a membrane capacitance Cm and a cell cytoplasm electric conductivity κi are changed, thereby calculating a dielectric spectrum (Step S2). The dielectric spectrum thus calculated is revolved to a dielectric relaxation expression, thereby obtaining a rise Δε in relative electric permittivity and relaxation time τ (Step S3). Next, dependency of (Δε, τ) on (Cm, κi) is obtained, thereby creating a regression expression corresponding to the shape of the cell as the object of the measurement (Step S4). A dielectric spectrum of the cell is actually measured, and the resulting values actually measured and the regression expression are compared with each other, thereby obtaining a membrane capacitance Cm, exp and a cell cytoplasm electric conductivity κi, exp of the cell as the object of the measurement (Step 5).

The invention provides a method which is used for measuring the octane value of petrol, based on the dielectric spectroscopy, and which relates to a method which adopts the dielectric spectroscopy to build a correction model of petrol of different compositions. The model is used for measuring the octane value of petrol. The method includes the following steps: 1, collecting modeling samples and data of dielectric spectroscopy; 2, pre-treating the modeling samples and the data of dielectric spectroscopy; 3, classifying the modeling samples; 4, respectively building correction models of various categories according to the results of cluster analysis; 5, verifying and correcting the correction model; and 6, predicting the unknown octane of the samples. The octane value of petrol is an indicator which is used for measuring the anti-knock performance of the petrol. The measurement method of the octane value of petrol has significance in the production and application of the petrol. The method can rapidly and efficiently determine the octane value of petrol within 5 minutes; the detection process is conducive to environmental protection; the samples require no pre-treatment; the analysis has the advantages of high speed and high reliability; the method can be used conveniently; and the costs of analysis are low.

The invention relates to a testing method for moisture states of an oil-immersed type bushing. Due to the influence to the oil-immersed type bushing by over-standard of drying production technology, sealing failure of outer insulation, insulation aging of oil paper and the like, the water in the insulation paper always maintains the nonuniform distribution state; the moisture state of the bushingis evaluated by the ground insulation resistance of a bushing tap, tangent value of dielectric loss angle, and electric capacitance; however, the previous testing process cannot obviously reflect thewater content in the insulation paper of the bushing, and the sensitivity is lower, so that the moisture state of the oil-immersed type bushing cannot be effectively evaluated. The testing method hasthe advantages that the hidden Markov model parameters of the bushing under different moisture states and at different temperatures can be obtained; according to the tested dielectric spectrum curve,the probability of different moisture states of the bushing is calculated by a shuffled frog leaping algorithm, so as to effectively test the moisture states of the oil-immersed type bushing.

The invention relates to a dielectric-spectrum-based method and system for detecting PPLP insulation of a superconducting cable. The method comprises: S1, applying excitation voltages at different frequencies to a test sample and calculating an impedance value, complex capacitance and dielectric loss of the test sample under different frequencies by measuring the the voltage and current of the test sample; and S2, acquiring an aging degree of the test sample to obtain an insulation detection result of the sample according to the complex capacitance, the dielectric loss and the corresponding frequency. Compared with the prior art, the method and system have the following advantages: the complex capacitance and dielectric loss of the PPLP are measured and calculated at different frequency points; and on the basis of frequency curve drawing and fitting comparison, the aging degree of the test sample is evaluated and thus the PPLP insulation performance can be detected comprehensively andeffectively.

The invention discloses a method for measuring a water-soluble protein drug terahertz (THz) dielectric spectrum by a waveform rebuilding technology. The method comprises: making use of a transmission-type terahertz time-domain spectrum device to measure the terahertz time-domain spectrum of nitrogen without placing a sample and taking the measured terahertz time-domain spectrum as a reference signal, measuring a terahertz time-domain spectrum signal of a sample pool filled with a protein drug water solution sample and taking the signal as a sample signal, then rebuilding the sample signal with the reference signal and a sample pool three-layer transmission model, finally using a Nelder-Mead optimization method to make the rebuilt sample signal approach the measured sample signal, and converting the obtained sample optical parameters into a terahertz complex dielectric spectrum containing a real part and an imaginary part. The invention can make full use of a multilayer accurate transmission model which is established by an electromagnetic transmission theory and in which terahertz passes through the sample to transmit, avoids the difficulty of converting complex numbers into real numbers in ordinary frequency domain optimization algorithm cost functions, and effectively improves the measurement accuracy of a protein drug water solution sample THz dielectric spectrum.

The invention relates to a transformer insulating board dampness quantitative evaluation method based on dielectric response characteristic. The method has the main technical characteristic that taking oil on a detected transformer, and sending an oil sample test object to laboratory test; performing on-site dielectric spectral measurement of an transformer; calculating a dielectric constant of the transformer under specific frequency, performing dielectric spectral measurement on an insulation paper test object; establishing a XY model; calculating the integral dielectric spectrum of the transformer under different water contents; fitting a relation of the dielectric constant of the transformer and the water content of an insulating board under specific frequency; and calculating the water content of the insulating board of the transformer. The method has the advantages of reasonable design, convenient measurement and calculating, and accurate result, realizes a quantitative evaluation function of the dampness condition of the insulating board of the transformer under condition of a sampling, is helpful for accurately grasping the running state of the transformer for operation andmaintenance staff, test staff, and maintenance staff, and realizes the accurate analysis and equipment management functions.

The invention discloses a rapid detection method of the milk protein content based on a dielectric spectrum technique. According to the rapid detection method, dielectric spectra (a relative dielectric constant spectrum and a dielectric loss factor spectrum) of a batch of milk samples within a radio frequency / microwave range are obtained by utilizing a network analyzer (or an impedance analyzer) and a coaxial probe, characteristic dielectric variables which express the milk protein content are extracted from the dielectric spectra, linear or nonlinear prediction models which are used for predicting the milk protein content are established on the basis of the dielectric spectra or the extracted characteristic dielectric variables within the whole frequency range, the models are inspected, and the model of which the root-mean-square error is the minimum is used as the optimum model for predicting the milk protein content. Data of the dielectric spectra under unknown characteristic frequency of the milk samples are substituted into the optimum model, so that the protein content of the samples can be calculated. The rapid detection method has the advantages of rapidity in detection, convenience, high precision, simplicity in operation and capability of real-time online detection.

The invention discloses an experimental method for insulation wetting and aging evaluation research of winding models. Firstly, an experimental platform is set up; secondly, winding models with different wetting and aging degrees are prepared; thirdly, a frequency-domain dielectric spectrum curve database of the different wetting and aging degrees of the winding models at reference temperature isobtained; fourthly, frequency-domain dielectric spectrum test and reduction is carried out on a winding model within unknown wetting and aging degree; fifthly, the similarity between the frequency-domain dielectric spectrum test result and the frequency-domain dielectric spectrum curves in the database is calculated; and finally, the wetting degree and aging degree of the unknown winding model areobtained. According to the experimental method, a frequency-domain dielectric spectrum curve database of the different wetting and aging degrees of the winding models is established to evaluate the wetting degree and aging degree of windings, and a reference can be provided for the evaluation research of the wetting degree and aging degree of transformer windings.

The invention relates to the technical field of analysis and detection, in particular to a method for identifying honey varieties based on an attenuated total reflection terahertz dielectric spectrum. The method comprises the steps of at first conducting terahertz scanning on a honey sample of which variety is known and obtaining a terahertz time-domain spectrogram, then transforming the terahertz time-domain spectrogram into a terahertz frequency domain spectrogram through Fourier transformation, conducting calculation to obtain the terahertz dielectric spectrum of the honey sample of which variety is known and conducting principal component analysis according to the terahertz dielectric spectrum to establish a PCA-DA model of the honey sample of which type is known; finally adopting the same method to conduct detection on honey sample to be tested to obtain a terahertz dielectric spectrum, then conducting identification on the terahertz dielectric spectrum according to the PCA-DA model, and the variety identified by the PCA-DA model is the variety of the honey of which the variety is unknown. According to the method for identifying honey varieties based on the attenuated total reflection terahertz dielectric spectrum, only terahertz spectrum of the unknown honey needs to be collected, and then identification can be conducted through the model; meanwhile, the method for identifying honey varieties based on the attenuated total reflection terahertz dielectric spectrum has the characteristics and advantages that detection speed is high, operation is convenient, no chemical agent is polluted, both time and labor are saved, and accuracy is high.

The invention discloses a method for a rapid dielectric response test based on time domain and frequency domain combination. The method includes obtaining a dielectric frequency spectrum with frequency of a product to be tested being larger than a set frequency threshold value; adopting a three-electrode method to measure polarization and depolarization current curves of the product to be tested;calculating conductivity of the product to be tested according to popularization and depolarization currents; calculating to obtain a dielectric frequency spectrum with frequency of the product to betested being lower than the set frequency threshold value according to the depolarization currents and conductivity; and splicing the dielectric spectrum with frequency of the product to be tested being larger than the set frequency threshold value and the dielectric spectrum with frequency being lower than the set frequency threshold value to obtain a dielectric spectrum of the product to be tested. The method provided by the invention combines advantages of PDC and FDS, and compared with a traditional FDS measuring method, 80% of time can be saved, and an effect of accuracy is greatly improved.

The invention discloses an FDS-based oilpaper capacitive bushing series polarization model building method. The method comprises the following steps of: 1, enabling each layer of capacitive medium ofan oilpaper capacitive bushing to be equivalent through connecting a capacitor and a resistor in parallel; 2, simulating a relaxation polarization phenomenon of each layer of capacitive medium througha branch circuit connected with the capacitor and the resistor in series, and enabling a relaxation polarization project of each layer of capacitive medium to be equivalent through connecting an RC series branch circuit on the basis of the step 1, so as to obtain a polarization circuit mode of each layer of the oilpaper capacitive bushing; and 3, connecting the n polarization circuit models, obtained in the step 2, of the layers of the oilpaper capacitive bushing to obtain an oilpaper capacitive bushing series polarization model. According to the method, the problem that the model parameter estimation is not correct enough as oilpaper capacitive bushing modeling time domain dielectric spectrum maps are easy to be interfered by environmental noise is solved.

The invention discloses a method for evaluating an insulation aging state of a rubber-plastic cable. The method includes the steps of an aging accelerating step of allowing a large current to flow through an intact rubber-plastic cable under a constant temperature and humidity condition until the main insulation material in the rubber-plastic cable is broken down, letting the total time be T, taking N-1 time points at the same time interval within the total time T, recording the time points as t1, t2, ..., tn-1 sequentially, and letting t0=0 and tn=T; a comparison database establishing step of sampling the main insulation material in the rubber-plastic cable at various time points from t0-tn, conducting a scanning electron microscope test, a laser diffraction particle size analysis, a dielectric spectrum test, a fluorescence spectrum analysis and an X-ray diffraction analysis, a thermogravimetric analysis, an electric pulse test and a tensile test, and establishing the correspondence between the above test or analysis data and the various time points from t0-tn correspondence in a comparison database; and an evaluating step of determining the remaining life of the rubber-plastic cable according to the data of the main insulation material the rubber-plastics cable under test.

The invention relates to a method for predicting remaining life of an EPR (ethylene-propylene rubber) nuclear power cable by applying dielectric frequency spectra and ultrasonic measurement nondestructive testing methods and establishing an ANN (artificial neural network) model. The method comprises the following steps: firstly, detecting key chemical, physical and electrical parameters closely related to aging by an accelerated thermal aging test in a laboratory; further analyzing the relationship of dielectric spectrum and ultrasonic measurement curves with physical properties, chemical properties and other electrical parameters; finding a dielectric spectrum and ultrasonic measurement range of an insulation material sensitive to aging, and designing an in-situ monitoring system; then, deducing single-factor and multi-factor aging state equations with a mathematical analysis method, and establishing a relationship model among aging factors, time, detection indexes and remaining service life by an artificial neural network; finally, realizing evaluation of the remaining service life of the cables by ultrasonic and dielectric spectrum nondestructive online detection in combinationwith the ANN model.

Embodiments include a method that includes obtaining a dielectric measurement of a portion of a downhole formation. The method also includes processing the dielectric measurement via a trained machine learning system. The method further includes determining at least one of a classification or a textural parameter simultaneously with formation water saturation of the downhole formation, via the machine learning system, based at least in part on the dielectric measurements. The machine learning system is based on pre-determined dataset from previous measurements or simulated results of synthetic cases. The method detangled the correlation between water saturation and formation texture through a frequency cascading training process based on sensitivity of complex dielectric spectrum with respect to desired parameters including water saturation and texture parameter. The method also includes assigning at least one of the classification or the textural parameter to the downhole formation.

The invention discloses a method for an intra-bushing insulation wetting experiment under impact load. Because traction load has the impact, the obvious difference exists in the major insulation moisture distribution of a traction transformer bushing and the insulation moisture distribution of a common power transformer bushing, and the effective evaluation for the major insulation wetting state of the traction transformer bushing is greatly affected. According to the provided experiment method, the insulation moisture transient distribution state of the bushing under the impact load can be simulated, and a frequency domain dielectric spectrum of the bushing insulation in the moisture transient distribution state can be obtained.

The invention discloses a fitting algorithm for the moisture content of an oil paper insulation system and relates to the field of fitting algorithms for the moisture content rate of oil paper insulation systems. An effective numerical calculation algorithm is provided for assessment of the moisture content rate of the oil paper insulation system. According to an oil paper insulation frequency domain dielectric spectrum quantification calculation formula and a parallel-connection coefficient, a frequency domain dielectric spectrum of insulation of aged or damp oil paper is calculated and fitted with an actual-measurement frequency domain dielectric spectrum to obtain the moisture content of the insulation system of oil paper to be tested; the moisture content of an insulation paper plate in the oil paper insulation system is quantitatively diagnosed, and meanwhile oil paper insulation databases different in temperature and different in moisture content do not need to be established through a large number of experiments; the fitting algorithm can be applied to a power transformer and electric equipment which adopts the oil paper insulation system as main insulation.

The invention relates to a small-size watermelon ripeness detection method based on a dielectric frequency spectrum. The small-size watermelon ripeness detection method comprises the following steps of: placing a watermelon to be detected into a detection device formed by three sets of electrodes which are tightly stuck to the surface of the watermelon; applying alternating electromotive force among the electrodes; measuring a dielectric response signal of the watermelon to the alternating electromotive force; carrying out data processing on a dielectric frequency spectrum signal; judging the ripeness of the watermelon through a clustering analysis; meanwhile, collecting temperature information in the detecting process and carrying out temperature compensation in the data analyzing process. According to the method disclosed by the invention, dielectric spectrums with different frequencies are used for realizing the nondestructive detection, and the problem that the measurement is inaccurate, caused by only using a single frequency, is overcome; meanwhile, the dielectric spectrum scanning is carried out at a plurality of angles so that the measuring error caused by individual difference is reduced; the electromagnetic interference is eliminated and the high-frequency interference to a collection circuit by an exciting circuit is eliminated; a temperature compensation algorithm is added and the influence on the measurement accuracy by temperature variation is eliminated.

The present invention discloses a system and method of vehicle cable terminal frequency domain dielectric spectrum experiment in an operation condition. The system comprises an experiment box body, and a cable terminal sample body, an insulation state detection unit, a cable terminal sample body, a frequency domain dielectric spectrum test system and a temperature regulation system 1 arranged in the experiment box body. The cable terminal sample body 21 is a cable terminal through processing, a hollow cylinder with small diameter is drilled out from the center of an internal cable core 31, and a resistance heating bar 32 passes through a hollow cylinder center and is connected with a radio-frequency power supply 6 through a wire. A function for simulation of temperature operation of cable in the load condition is realized. The obstacle caused by high cost and large size of the operation environment of a current phytotron simulation cable for the cable dielectric spectrum experiment is overcome so as to satisfy the research need, and the simple and practicable system and method of the vehicle cable terminal frequency domain dielectric spectrum experiment in the operation condition are provided.