1012 results about "Induced voltage" patented technology

The invention discloses a pulsed eddy current detection method and system for a thermal power pipeline with a coating layer, and relates to the technical field of pulsed eddy current nondestructive detection.The pulsed eddy current detection method comprises the steps that pulsed eddy current detection simulation and experiment are conducted under the condition of a three-dimensional simulation model and a test piece, and excitation current waveform, amplitude and frequency parameters are determined; an induced voltage signal is collected, peak values, time points and attenuation characteristics are extracted, the corresponding relation between the wall thickness, the coating layer thickness and the welding seam structure and detection signals is constructed, a parameterized database is constructed, and temperature correction is completed; and optimizing a sensor structure and a signal acquisition scheme according to a parameterized database, obtaining detection data in a pipeline operation state, completing two-dimensional imaging of wall thickness distribution and welding seam positioning, and forming detection information covering a straight pipe, an elbow and a welding seam area. According to the method, wall thickness detection and welding seam positioning of the thermal power pipeline under the conditions of a thick wall and a thick coating layer are achieved through the full-process design of test piece modeling, simulation experiment and imaging collection.

A method for testing sheath impedance in a high-voltage cable cross-bonding system. Three-phase current data and three-phase grounding circulating current data from a first cable body segment and a last cable body segment in cross-bonding units, and three-phase current data, three-phase grounding circulating current data, and three-phase induced voltage data from a cable body at a cross-bonding box are detected and collected, thereby directly calculating three-phase sheath impedance of the three cable segments and determining whether the three-phase sheath impedance is abnormal (step 5), thus determining whether the tested cross-bonding units have a defect. The present invention involves a simple operation, achieves an accurate testing result, and can achieve energized testing without an external excitation source. By performing real-time testing on the cross-bonding units and calculating the sheath impedance of the three cable segments in the cross-bonding units in real time, the states of the cross-bonding units can be determined in real time, which makes it possible to detect a cable fault immediately, thereby preventing a loss caused due to the cable fault.

The invention provides a method and a system for measuring plasma current in a quasi-ring symmetrical star simulator, and relates to the technical field of star simulators, and the method comprises the steps: determining a sensor design index according to a bootstrap current simulation calculation result, and converting the design index into an actual arrangement scheme according to an installation environment constraint; all the magnet coils are independently excited in a plasma-free state, wall eddy current interference signals generated by the magnet coils are calibrated, and thus wall eddy current calibration voltage signals are output; a sensor in an actual arrangement scheme is used for synchronously collecting a total original induced voltage signal including plasma current and wall eddy current; an integral voltage signal representing the total current is output; and compensating the integral voltage signal by using the wall eddy current calibration voltage signal, and inverting the final measurement value of the plasma current in the quasi-ring symmetric star simulator. The device and the method have the beneficial effects that the interference of a stray field on a measurement result is weakened, and a high-precision diagnostic tool is provided for the plasma physical research of the star simulator.

The invention discloses an overhead line-high voltage cable sheath lightning stroke induced voltage calculation method. At present, the voltage of a lightning stroke point, a connection point of an overhead line and a cable and a point in a well of each joint along a cable sheath cannot be obtained at the instantaneous moment of lightning stroke of the overhead line on site. According to the method, electromagnetic transient simulation modeling is carried out on actual spatial positions, structural parameters and material parameters of field overhead lines and high-voltage cables, electromagnetic transient simulation modeling is carried out on lightning currents, electromagnetic transient modeling is carried out on normal operation conditions and actual lightning stroke fault conditions of an electric power system, and after the randomness of the fault occurrence moment is considered, the electromagnetic transient simulation modeling is carried out on the actual lightning stroke fault conditions of the electric power system. And the maximum lightning stroke induced voltage value of each point along the cable sheath after lightning stroke is calculated through electromagnetic transient simulation software, so that a reference basis is provided for insulation matching design of the cable sheath of the overhead line-cable mixed line invaded by lightning current, and a foundation is laid for design evaluation of various subsequent voltage limiters and protectors.

The invention relates to the technical field of copper rod blank detection, in particular to a defect detection method and device for a copper rod blank, and the method comprises the following steps: S10, formulating a quality grade table of the copper rod blank; the copper rod blank is placed on a conveying roller way, and the conveying roller way is started; s20, the speed of a conveying roller way is adjusted, and when the copper rod blank is driven to move to the position in front of a detection area in the conveying direction, an electromagnetic rotation driving device and an electromagnetic induction detection module are started; s30, a second control unit and a second current regulator are used for controlling starting of a second electromagnetic coil, an electromagnetic sensor detects a defect signal, induced voltage is calculated, and defect information of the copper rod blank is collected; s40, calculating an intensity factor X1, a damage degree factor X2 and an influence degree factor X3 according to the defect information; the defect fraction Q of the copper rod blank is calculated according to the formula Q = W1 * X1 + W3 * X2 + W3 * X3; and rating the copper rod blank corresponding to the quality grade table. The method effectively reduces the omission ratio of the defects of the copper rod blank, and accurately recognizes the internal defects.

A calibration method of the magnetic field model and a controller for electromagnetic positioning are provided. In the method, a magnetic field is established through a magnetic field transmitter; measurement data is obtained through a magnetic field sensor, where the measurement data includes the amplitude of induced voltage at multiple measurement positions in the magnetic field; and the magnetic field model is corrected according to the error between the measurement data and simulated data correction, where the magnetic field model is used to generate simulation data corresponding to multiple measurement locations. The steps of modifying the magnetic field model include: establishing one or more objective functions through the nonlinear least squares method based on the error between the measured data and the simulated data; and determining the modified magnetic field model based on one or more solutions of the objective function. Therefore, positioning accuracy can be improved.

The invention discloses a small generator, and relates to the technical field of generators. The motor comprises a shell, double-end heat dissipation ventilation holes, a permanent magnet shielding rotor and a temperature control torsion limiting protection assembly. The grooves in the periphery of the rotor and the built-in paddles construct through airflow during rotation, so that self-dispersing heat dissipation is realized; coil temperature rise triggers a triode through a thermistor to drive a protection electromagnet, torque transmission of a fluted disc friction coupling is adjusted, and continuous derating can be achieved until zero-coupling shutdown is achieved; the permanent magnet adjusting assembly rapidly cuts off magnetic field output through an iron shell-aluminum strip-permanent magnet combination and an electromagnetic locking mechanism, and it is guaranteed that no induced voltage exists in the overhaul period.

The invention provides an intelligent monitoring method for a high-voltage cable grounding box, and the method comprises the following steps: collecting the current data and voltage data of a protector grounding box, calculating the resistive current value of the protector grounding box, comparing the resistive current value of the protector grounding box with a set threshold value, and determining the current value of the protector grounding box. And fault information of the protector grounding box is accurately determined according to a comparison result. The resistive current component of the protector is calculated in real time by acquiring the induced voltage and current signals of the metal sheath and the armor layer of the high-voltage cable, so that the running state of the protector is accurately researched and judged, the breakdown frequency of the protector is counted, and when a corresponding alarm threshold value is reached, corresponding alarm information and processing measures are given, so that the safety of the protector is ensured. Real-time monitoring and comprehensive evaluation of the operation states of the high-voltage cable and the grounding box thereof are realized, and the safety and reliability of cable operation are improved.

The invention is suitable for the technical field of grounding grid defect evaluation, and provides a transient electromagnetism-based grounding grid corrosion defect evaluation method and system, and the method comprises the steps: placing a sensor of a transient electromagnetic detection device above a to-be-detected region of a grounding grid, injecting a pulse current excitation signal into a conical focusing excitation coil, and carrying out the detection of the to-be-detected region of the grounding grid; acquiring an induced voltage time sequence signal through a receiving coil; extracting at least one characteristic parameter from the induced voltage time sequence signal, wherein the characteristic parameter comprises a signal peak value, peak value time, an attenuation rate or a signal integral quantity; inputting the characteristic parameters into a preset corrosion evaluation model, and performing inversion to obtain a residual thickness value or a corrosion depth value of the grounding grid in the to-be-detected area; generating and outputting a quantitative evaluation result containing the residual thickness value or the corrosion depth value; the method can be implemented in a non-stop state of the grounding grid, and an efficient and reliable decision basis is provided for safe operation and state maintenance of a power system.

The invention belongs to the technical field of geophysical exploration, and particularly discloses a differential transient electromagnetic method device and an unexploded ordnance detection method thereof.The differential transient electromagnetic method device is characterized in that a transmitter injects emission current into an emission loop, and the emission loop generates a primary field excitation signal; the underground anomalous body target generates a secondary field excitation signal under the action of the primary field excitation signal; the receiving coil assembly is based on the structure of a differential coil, synchronously counteracts a primary field excitation signal and a uniform background signal in an induced voltage, and expands a local asymmetric differential signal generated by an underground anomalous body target; and the receiver carries out time sequence analysis on the local asymmetric differential signals and extracts differential signal features so as to realize positioning and identification of an underground anomalous body target. The device is suitable for detection of shallow-buried small bodies such as UXO, the overall arrangement range of the device is small, and rapid arrangement and mobile observation in the field are facilitated.

The invention discloses a head space positioning method, device and system based on electrical impedance tomography, and the method comprises the steps: constructing a corresponding three-dimensional model according to the basic parameters of a flexible electrode cap, and carrying out the finite element meshing, and obtaining a three-dimensional mesh model; performing electric field distribution calculation on sampling points of the three-dimensional grid model according to a preset calculation rule to obtain corresponding touch electrode response information; generating a sensitive field matrix corresponding to the sampling points and the electrode pairs in the flexible electrode cap according to the touch electrode response information; performing projection matching according to the initial voltage data of the electrode pair and the sensitive field matrix to obtain projection matching information; and performing model training according to the projection matching information and the tensile deformation data of the flexible electrode cap to obtain a voltage feature-space coordinate mapping relation, and analyzing the induced voltage data of the electrode pair to obtain corresponding target coordinate information. According to the method, the voltage change of the flexible electrode cap is obtained and analyzed to obtain the coordinate information, and the positioning accuracy and stability are improved.

The present invention discloses a wireless ultrasonic measurement system and a construction method thereof, wherein the measurement system includes a sensing module and a detection module; the sensing module includes a piezoelectric layer on the surface of the detection object, a first lead-out electrode structure, a first grounding electrode structure, a first insulating plate, and a sensing coil; the first insulating plate is provided with a first opening; the first lead-out electrode structure includes a first lead-out electrode on the top of the piezoelectric layer and a second lead-out electrode in the first opening; the first grounding electrode structure includes a first grounding electrode and a second grounding electrode; the second lead-out electrode and the second grounding electrode are respectively connected to the first lead-out electrode and the first grounding electrode; the sensing coil is provided at the top of the first insulating plate. The detection system of the present invention uses an insulating plate to isolate the sensing coil away from the surface of the detection object, which is conducive to the sensing coil generating a non-zero induced voltage U ind , thereby enhancing the signal of the receiving coil, and realizing contactless ultrasonic signal reception with a receiving distance of up to 20mm.

The invention belongs to the field of sensors and signal processing, and particularly relates to a wavelet kernel scale sensitivity oriented abrasive particle induced voltage signal noise reduction method, which comprises the following steps: acquiring an abrasive particle induced voltage signal, and carrying out harmonic elimination on the abrasive particle induced voltage signal to obtain a preprocessed signal; constructing a wavelet kernel function, and calculating the wavelet kernel function and the preprocessed signal to obtain a kernel scale guiding spectrum; constructing a sparse joint noise reduction model based on the kernel scale guiding spectrum; processing the sparse joint noise reduction model to obtain a convex optimization objective function; solving the convex optimization objective function by combining a self-adaptive step gradient descent method and a self-adaptive iterative shrinkage threshold method to obtain a weight vector representing the distribution of the abrasive particle characteristic signals; carrying out binarization processing on the weight vector representing the distribution of the abrasive particle characteristic signals to obtain a characteristic indication vector; carrying out Hadamard product on the feature indication vector and the preprocessed signal, and then carrying out low-pass filtering to obtain a noise reduction signal; according to the method, the abrasive particle characteristic signals can be self-adaptively subjected to non-destructive enhancement and noise reduction processing in a strong interference environment.

A power transmission tower grounding resistance non-contact measurement method based on the electromagnetic coupling principle comprises the following steps that transmitting and receiving electromagnetic coupling coils are arranged around an iron tower grounding body, and geometric calibration and spatial positioning of a measurement area are completed by combining grounding grid structure parameters and soil conduction characteristics; injecting a high-frequency alternating-current excitation signal into the transmitting coil, and synchronously acquiring the amplitude and phase response of the induced voltage at a receiving coil end; carrying out filtering processing on the induction signal by adopting a time-frequency analysis and phase decoupling algorithm, and solving a function relationship between electromagnetic response and grounding impedance by combining a coupling equivalent model; based on experimental calibration data and scene parameters, a nonlinear mapping model of induction response and grounding resistance is constructed, and real-time inversion calculation is carried out by combining a solving result obtained in the third step. According to the invention, the real-time accurate measurement of the grounding resistance under the conditions of no power failure and no wire breakage is realized, and the safety, the operation convenience and the anti-interference capability in a complex environment in the measurement process are obviously improved.

The invention provides a metal pipeline defect detection method based on a time-frequency domain electromagnetic method, which comprises the following steps of: (1) establishing a time-frequency domain dual-mode electromagnetic sensor test system with parallel time-frequency domain coils, and respectively measuring and acquiring electromagnetic response parameters through two modes; (2) measuring by a frequency domain method to obtain a function relationship of the depth dn of the near-surface small-size defect with respect to the surface size r of the small-size defect and an induced voltage difference value Ufd; (3) measuring by a time domain method to obtain a function relationship between the attenuation rate k and the thickness D; and (4) performing detection optimization on different types of defects through data fusion of a time domain method and a frequency domain method.

The invention discloses a GIS isolation switch shell induced voltage simulation method and system, and relates to the technical field of power equipment and electromagnetic field simulation, and the method comprises the steps: building a GIS isolation switch shell induced voltage simulation model; performing network division on the GIS disconnecting switch shell induced voltage simulation model; setting a boundary and loading excitation; solving magnetic field intensity distribution; constructing an equivalent circuit, and calculating the induced voltage of the shell; and setting an early warning model to carry out equivalent early warning on the induced voltage of the shell. By establishing an accurate GIS isolating switch shell induced voltage simulation model and combining quantitative analysis of an electromagnetic field and equivalent circuit calculation, the induced voltage change of the GIS isolating switch in a high-voltage environment can be accurately predicted, and the induced voltage can be dynamically evaluated through a real-time monitoring and early warning model, so that the accuracy of the GIS isolating switch shell induced voltage simulation model is improved. Early warning of the equipment state is achieved, and equipment faults or potential safety hazards caused by the fact that the induced voltage exceeds the standard are effectively prevented.

A system and method for measuring mutual inductance between adjacent first communication transmission line and second communication transmission line is disclosed. The system includes a mutual inductance measurement circuit that includes a coupling generator which biases the first communication transmission line with a current ramp signal; a sample and hold circuit which captures an induced voltage on the second communication transmission line using a switched capacitor storage element; a switched capacitor integrator configured to integrate the induced voltage onto an output voltage node; and a comparator configured to switch states once the switched capacitor integration has surpassed a reference trippoint.

The invention discloses a zero-voltage turn-on circuit and a zero-voltage turn-on method of a switching tube in a switching power supply, and belongs to the technical field of circuits. In a critical conduction mode, when a low-side power tube is turned off, the rising edge zero-voltage starting circuit compares a switch node voltage with an input voltage or compares the switch node voltage with an output voltage under the control of a low-side gate driving voltage, outputs a high level to a high-side gate driving end when the switch node voltage is equal to the input voltage or the output voltage, and outputs a low level to a low-side gate driving end when the high level is equal to the output voltage. A high-side power tube is controlled through a high level to realize zero-voltage starting; in a critical conduction mode, when the high-side power tube is turned off, the falling-edge zero-voltage starting circuit compares an induced voltage with a pull-up resistor voltage under the control of a high-side gate driving voltage, outputs a high level to a low-side gate driving end when the induced voltage is equal to the pull-up resistor voltage, and controls the low-side power tube to realize zero-voltage starting through the high level. The induced voltage is equal to the sum of the pull-up resistor voltage and the switch node voltage. According to the invention, the transmission delay can be reduced.

The present invention discloses a superconducting motor quench detection method and apparatus based on rotational symmetry of a motor, belonging to the technical field of superconducting motor quench detection. The method includes: acquiring terminal voltages of each group of superconducting magnets in a superconducting motor, where the superconducting motor is pre-divided into at least two unit motors by using the rotational symmetry of the motor, and superconducting magnets located at corresponding positions are selected from the at least two unit motors as a group of superconducting magnets; calculating an absolute value of a terminal voltage difference of each group of superconducting magnets; and judging whether the absolute value exceeds a preset threshold, and if the absolute value exceeds the preset threshold, determining that the superconducting magnets are in a quench state. According to the present invention, induced voltages coupled by the terminal voltages of superconducting magnets are eliminated.

A charging device includes: a power transmission coil configured to transmit electric power to a terminal device; a position detection coil that includes a plurality of coils, and is configured to detect a position of a power reception coil of the terminal device; a foreign substance detection coil that includes a plurality of coils corresponding to the plurality of coils of the position detection coil; and a processor configured to supply electric power to a first coil among the plurality of coils of the foreign substance detection coil in a state in which the terminal device is not placed on a placement part, to determine that a conductive foreign substance is present on the placement part in a case in which a variation amount of induced voltage generated in the position detection coil is equal to or larger than a predetermined threshold.

The invention provides a single-valued transient electromagnetic apparent resistivity calculation method based on deep learning, and the method comprises the following steps: a), carrying out the normalization processing of an actually-measured induced voltage, and obtaining a normalized induced magnetic field; b) a deep neural network model comprising an input layer, a plurality of hidden layers and an output layer is constructed, the input layer receives the normalized induced magnetic field, and the output layer outputs transient field parameters; c) training the deep neural network model by using a Nadam optimization algorithm, wherein a training sample set comprises multiple groups of actually measured induced voltages and transient field parameters corresponding to the actually measured induced voltages; and d) inputting the actually measured induced voltage to be measured into the trained deep neural network model, obtaining the output transient field parameters, and calculating the apparent resistivity according to the theoretical formula of the transient electromagnetic field. Compared with a traditional method, the method has the advantages that the fitting capacity of nonlinear data is higher, and the transient electromagnetic apparent resistivity can be solved more accurately.

The invention relates to a shaft grounding device for deriving an inductively generated voltage, current or charge from a first machine element (5), preferably a shaft, into a second machine element (1), having a shaft grounding element (4, 50) for discharging, according to the invention, the shaft grounding element (4, 50) is a component separated from a starting material, preferably a continuous article, said component being penetrated by channels (16) in the longitudinal direction thereof or being provided with perforations and / or surface structures and / or surface textures at least on the contact surface thereof with the first machine element. The invention also relates to a method for manufacturing the shaft grounding device.

The invention relates to the technical field of vibration sensors, and discloses a miniaturized digital vibration sensor, which comprises a shell, one side of the shell is connected with a shell cover, and one side of the shell cover is provided with a detection assembly for detecting vibration; the detection assembly comprises a shielding seat and a connecting rod, one side of the top of the shielding seat is provided with a magnet, and the top of the magnet is provided with a magnetic core; a coil sleeving the outer side of the magnetic core is adhered to the bottom of the connecting rod; a ruby in contact with a to-be-detected object is fixed at the top of the connecting rod; the inner wall of the shell cover is in threaded connection with a pressing ring, the top of the pressing ring is connected with a second spring piece, the top of the second spring piece is connected with a supporting frame, when vibration is generated through rotation of the bearing, the ruby makes contact with an outer ring of the bearing and transmits the vibration to the connecting rod, and the connecting rod drives the coil to move on the outer side of the magnetic core, cuts magnetic lines of force and generates induction voltage. The electromagnetic induction principle ensures that a vibration signal can be accurately converted into an electric signal, so that high-precision vibration measurement is realized.

Common mode voltage discharge shields are disposed over end turns of stator windings for a three phase electric traction motor within an electric vehicle. The common mode voltage discharge shields are capacitively coupled to the end turns to a ground strap, providing a low impedance path for common mode voltages accumulating at a neutral for electric traction motor as a result of high frequency switching of the motor drive voltage to produce desired torque. An insulating layer separates the common mode voltage discharge shields from the end turns. Accumulation of the common mode voltage in excess of a bearing breakdown voltage, and the associated potential for discharge through bearings between the stator and rotor and electrical discharge machining, is reduced or eliminated.

The invention relates to the technical field of address exploration, and discloses a coal goaf water accumulation area analysis method and device and a storage medium. The method comprises the following steps: acquiring the resistivity of a goaf, the resistivity below the height of three zones above the goaf, an induced voltage value of the goaf and a multi-track curve of the goaf by using a transient electromagnetic method; obtaining the ratio of the induced voltage values of the early stage track and the late stage track of the goaf according to the multi-track curve of the goaf; processing the specific value of the induced voltage values of the early stage channel and the late stage channel of the goaf obtained by the resistivity of the goaf at each measuring point, the resistivity below the height of three zones above the goaf, the induced voltage values of the goaf and the multi-measuring-channel curve of the goaf by utilizing a principal component analysis method; synthesizing the four parameters at each measuring point into an evaluation parameter S; and establishing a slice map of the evaluation parameter S of the goaf. The method can improve the explanation accuracy of the goaf ponding area range.

The invention relates to a charging method of an electrostatic collection board, which comprises the following steps that the electrostatic collection board comprises an inner layer board and an outer layer board, the inner layer board and the outer layer board are both metal plates, the inner layer board and the outer layer board form a capacitor, the outer layer board is electrically connected with a relay, the relay is respectively connected with a + / -1000V charging circuit, the outer layer board is provided with a conductive carrier, and the conductive carrier is connected with the outer layer board. The conductive carrier is used for collecting electrostatic charges; the inner layer plate is electrically connected with the active detection circuit; the outer layer plate is charged through the charging circuit, and the on-off of a circuit between the charging circuit and the outer layer plate is switched through the relay; meanwhile, induced charges are generated on the inner layer plate, induced voltage is generated, and the induced voltage is actual voltage. According to the scheme that the outer layer plate of the electrostatic collection plate is charged and the active detection circuit is connected to the inner layer plate, the charging voltage on the outer layer plate can be more accurate, the detection result of the decay time can be more accurate, and the collected static electricity can be used for charging equipment or providing electrostatic protection.

The invention discloses a tunnel cable grounding ring current intelligent detection and analysis system and method, and relates to the technical field of intelligent detection, and the method comprises the following steps: collecting the current of cable metal sheath grounding ring current, sheath induction voltage, equipment temperature and tunnel humidity through a sensor; analyzing and processing the collected data to obtain comprehensive detection parameters; setting a threshold value, comparing and analyzing the obtained detection data, and judging whether an abnormal condition occurs or not; according to the generated instruction, carrying out early warning and abnormity prompting on the detected abnormal condition; according to analysis and detection of different parameters, the specific types of abnormalities can be judged, the safety detection mode is triggered when it is detected that only the safety evaluation index is abnormal, whether the numerical calculation process is abnormal or not is analyzed, the numerical abnormality situation caused by calculation abnormality can be eliminated, and the safety of the numerical calculation process is improved. Detection errors of abnormal conditions of the equipment are reduced, and the problem that the false alarm rate is high in the detection process is solved.

The invention discloses a silicon carbide MOSFET parallel current sharing system and method for a pulse power supply, and belongs to the technical field of SiC MOSFET parallel current sharing, the system comprises a main power circuit connected with a plurality of SiC MOSFETs in parallel and an active driving circuit, when the SiC MOSFETs are turned on, a source inductor generates an induced voltage in direct proportion to the current rising rate, and when the SiC MOSFETs are turned on, the active driving circuit drives the main power circuit to rotate; current sharing when a plurality of SiC MOSFETs are connected in parallel is realized through an in-phase amplification circuit used for detecting and amplifying an induced voltage, a differential amplification circuit used for detecting and comparing an induced voltage value, and a proportional current source circuit is controlled to extract a SiC MOSFET gate drive current. By adopting the method, the unbalanced current can be suppressed, the balance of the current flowing through each branch of the parallel SiC MOSFETs is ensured, the SiC MOSFET device in the high-voltage pulse power supply is effectively protected, and the working reliability of the circuit is improved.

The invention relates to the technical field of power system operation and maintenance, in particular to an intelligent line shaking insulation nuclear phase test system and a test method thereof.An insulation resistance test module adopts a self-adaptive algorithm, the influence of environment temperature and humidity on a test result can be eliminated, and the insulation resistance measurement precision is remarkably improved; a dynamic grounding technology: the induced voltage suppression module adjusts a grounding state and a compensation voltage in real time through the dynamic grounding technology and a voltage compensation algorithm to ensure that a test result is not interfered by the induced voltage; a test neutral period and a quick access technology are optimized: the system can quickly complete access and test in a neutral period from grounding disconnection of a to-be-tested line to equipment access test, and damage to equipment caused by secondary rise of induced voltage is avoided; and real-time monitoring and adjustment: in the test neutral period, the system monitors the line induction voltage in real time, and dynamically adjusts the grounding state and the compensation voltage according to the monitoring result to ensure the equipment safety.

The invention relates to a method for positioning a vehicle (2), having a mobile inductive charging apparatus (1a), in a defined position with respect to a stationary inductive charging apparatus (1b), wherein a positioning signal generated in one of the two inductive charging apparatuses (1a, 1b) induces at least one voltage signal (13a, 13b) in the other of the two inductive charging apparatuses (1a, 1b), a relative distance between the mobile inductive charging apparatus (1a) and the stationary inductive charging apparatus (1b) is approximated from the induced voltage signal (13a, 13b), and a directional deviation of the vehicle from a target direction in relation to the stationary inductive charging apparatus is ascertained using a parking space detection sensor.