133 results about "Electric field sensor" patented technology

The invention discloses an error correction method and device for non-intrusive voltage differential measurement, a medium and a product, and relates to the technical field of voltage measurement, and the method is applied to a scene in which a differential electric field sensor array is arranged in a set range with a measured conductor as the center. Comprising the following steps: constructing an initial correction model based on a sensor distance and a measured conductor voltage; under the actual working condition, the initial correction model is processed through a least square method, and a correction model is obtained; when non-intrusive voltage differential measurement is carried out, the current measured conductor voltage and the sensor distance are obtained, and a correction coefficient is determined by adopting the correction model; and completing error correction of non-intrusive voltage differential measurement based on the correction coefficient. According to the invention, the complexity of an inversion algorithm and the special requirement on the spatial position of the sensor can be reduced.

The invention discloses a self-excited AGC closed-loop detection system of an MEMS electric field sensor, and the system comprises an MEMS sensitive structure which comprises a shielding electrode, an induction electrode and a driving structure, the driving structure receives a voltage driving signal, generates mechanical deformation, drives the shielding electrode to generate displacement, couples a to-be-detected electric field signal with a displacement signal of the shielding electrode, and outputs a to-be-detected electric field signal and a to-be-detected electric field signal; outputting a differential mode current signal; the driving circuit is connected with the excitation end and the output end of the MEMS sensitive structure and is used for adjusting gain according to the displacement signal and adjusting a voltage driving signal according to the gain so as to form AGC closed-loop feedback and maintain stable resonance of the MEMS sensitive structure; and the signal demodulation circuit is connected with the output end of the MEMS sensitive structure and is used for receiving and demodulating the differential mode current signal. The beneficial effects of the invention are that the stability of the vibration amplitude of the sensor is guaranteed, the anti-interference capability and the electric field induction sensitivity of the sensor are improved, and the high-precision detection of the to-be-detected electric field signal is realized.

The invention relates to a dielectric elastomer-piezoelectric composite multi-source energy collection device for a non-intrusive electric field sensor, and belongs to the technical field of power system self-powered sensors. The device comprises a base, a dielectric elastomer unit, a piezoelectric cantilever beam, a mass block and a rectification energy storage circuit. The dielectric elastomer deforms under the action of an alternating electric field, the piezoelectric cantilever beam is driven through coupling to generate mechanical vibration, and the piezoelectric layer further converts mechanical energy into electric energy to be output. The resonant frequency of the system is adjusted by setting the mass block, so that the resonant frequency is matched with the external electric field frequency or the environment vibration frequency, and the energy conversion efficiency is optimized. The device can collect external electric field energy in a non-intrusive mode and provide a stable power supply required by a low-power-consumption sensor. The device is compact in structure, high in sensitivity and suitable for electric field monitoring in scenes such as ultrahigh-voltage power transmission lines and transformer substations, and provides reliable energy support for self-powered sensors of power equipment.

A control system 40 for operating a work machine 10 around an over-head power line 42 has an electric field sensor 41 and an operator input, such as a user interface 6. If the output from an electric

A system for automatically locking a control laser in a Rydberg atomic sensor may comprise an atomic vapor cell, a probe laser configured to excite the atoms in the atomic vapor cell to an intermediate energy state, and a control laser configured to excite the one or more atoms in the atomic vapor cell from the intermediate energy state to a higher energy state. The light generated by the control laser may be dithered at a pre-determined frequency. The system further comprises a photodiode configured to convert light received from the vapor cell into an electrical signal, a lock-in amplifier configured to generate an error signal based on the electrical signal received from the photo diode and a received reference oscillation frequency, and a servo configured to receive the generated error signal from the lock-in amplifier and adjust a frequency of the control laser based on the received error signal.

The invention discloses a hardness self-adaptive adjustment high-voltage insulation shielding cover which comprises a composite insulation cover body, the composite insulation cover body sequentially comprises an outer insulation layer, a middle magnetorheological elastomer interlayer and an inner attaching layer from outside to inside, and a miniature electric field sensor is embedded in the surface of the outer insulation layer and used for monitoring the intensity of a surrounding electric field in real time; the flexible electromagnetic coil is embedded in the middle magnetorheological elastomer interlayer; the intelligent induction energy storage module is integrated in a lightweight waterproof box at the top of the composite insulation cover body and comprises a magnetic field controller, a micro super capacitor, an electric field signal processor and a pressure signal converter, and the magnetic field controller is connected with the flexible electromagnetic coil through a wire; through the three-layer structure design of the composite insulation cover body and corresponding material selection, double guarantee of insulation protection and self-adaptive fitting is realized.

The invention relates to the technical field of electric field sensors, in particular to an electric field sensor gain increasing method based on nitride quantum dots. The method comprises the following steps: firstly, constructing a nitride and graphene heterojunction model by utilizing a first principle, calculating quantum capacitance, and screening out optimal quality structure configuration; preparing a sensor according to the configuration and the initial process parameters, and obtaining the actual measurement sensitivity in the simulated electric field; further constructing an optimization model taking the quantum dot size and the dielectric layer thickness as input and the sensitivity as a target, calculating a parameter gradient by utilizing a gradient ascending method, and outputting a correction value; and finally, carrying out closed-loop iteration of preparation, testing, calculation and adjustment until the objective function is converged, and outputting final process parameters. According to the invention, collaborative optimization of microcosmic electronic structure screening and macroscopic process parameters is realized, and the detection sensitivity and the signal-to-noise ratio of the electric field sensor are remarkably improved.

The application discloses a near electric field alarm safety helmet and an alarm method for omnidirectional field intensity vector monitoring, and relates to the field of electric power safety protection. The safety helmet comprises an omnidirectional field intensity sensing array, a vector field signal processing module and an alarm module which are assembled on a safety helmet body. The omnidirectional field intensity sensing array comprises at least five electric field sensors which are arranged on the top of the safety helmet body and around the brim of the safety helmet body. The vector field signal processing module is used for acquiring electric field intensity components collected by the electric field sensors, and performing vector synthesis on the electric field intensity components to determine the spatial electric field intensity and the field source direction. The spatial electric field intensity is compared with preset safety threshold values and critical threshold values respectively to determine the alarm level of the position where the safety helmet is located. The alarm module is used for outputting corresponding alarm prompts according to the alarm level. The spatial electric field intensity and the field source direction are determined by synthesizing electric field intensity components in different directions, thereby solving the problem that the electric field detection result of the existing safety helmet is inaccurate.

Systems, methods, and apparatuses can control work machine movement to prevent collision with an overhead power line. With the work machine performing machine movement relative to the overhead power line, a combination of the magnitude of electric field sensed by any one of a plurality of electric field sensors and velocity of machine movement for an associated position and / or movement sensor can be monitored to determine whether such combination reaches or exceeds one or more predetermined thresholds. Operations regarding machine control can be performed responsive to the combination reaching or exceeding each of the one or more predetermined thresholds.

This invention discloses a method and system for reconstructing the full waveform of port voltage of power equipment based on transient radiated electric field signals. This method reconstructs the average voltage across the equipment based on the transient radiated near-electric field generated when the high-voltage direct current (HVDC) power equipment operates, obtaining a fitted full waveform of the port voltage. This can be used for non-contact online monitoring, fault diagnosis, and situational awareness of HVDC power equipment. This invention effectively overcomes the shortcomings of traditional methods for calculating electromagnetic radiation interference in converter stations, such as high computational resource consumption and low simulation efficiency. The monitoring method based on electric field sensors overcomes the disadvantages of traditional voltage measurement devices, such as large size, high cost, and high maintenance difficulty. This invention enriches the means of online monitoring of power equipment in HVDC converter valve halls and improves the maintenance efficiency of DC systems.

A sensitive unit structure of a piezoelectric-piezoresistive coupled electric field sensor and application, comprising a substrate, a cantilever beam structure is arranged on the substrate, a piezoelectric crystal block is bonded between the lower surface of the cantilever beam structure and the upper surface of the substrate, and a Wheatstone full-bridge structure is arranged on the upper surface of the cantilever beam structure; when the piezoelectric crystal block is subjected to the action of an electric field, the piezoelectric crystal block generates deformation along the Z-axis direction under the action of the inverse piezoelectric effect, so that the cantilever beam structure is deformed; in the Wheatstone full-bridge structure, the resistors arranged at the positions with the maximum stress difference generate deformation under stress, the stress directions of the resistors are opposite, and the resistance value changes are opposite; compared with the commonly used electric field sensor sensitive unit structures such as the electro-optic type and the mechanical type, the present application has the advantages of a larger range, a smaller size, lower power consumption and easy mass production.

The invention discloses a coupling type electric field sensing element medium-electrode joint optimization method based on Sierpinski fractal, belongs to the technical field of electric field sensing elements, and aims to solve the problem that it is difficult to stably improve the electric field sensing direction performance under the condition that the core size is not changed in the prior art. The method comprises the following steps: establishing an electrode-medium joint finite element model considering the dispersion characteristic of a material; the method comprises the following steps: dividing a central conductor region and fractal regions on two sides in an electrode design domain, and constructing a parameterized Sierpinski fractal structure in the fractal regions; establishing an optimization model taking electric field induction directivity as a target based on the finite element model, and setting geometric manufacturing constraints; a strategy of combining experimental design and an agent model is adopted for parameter optimization, optimized electrode-medium combined structure design parameters are output, and performance can be verified through simulation and experiments. The method does not need to change the core size of an element, can precisely regulate and control the electric field distribution, improves the direction performance and optimization efficiency, guarantees the manufacturability of an optimization result, and is suitable for the design of a high-precision electric field sensor.

The present invention provides a transparent and flexible electronic skin with three-dimensional sensing capability. The electronic skin comprises: a substrate; an transparent and flexible electric field sensor disposed on the substrate; a control circuit disposed on the substrate; and a transparent and flexible protective layer encapsulating the electric field sensor and the control circuit. The electric field sensor includes a transmitter electrode; one or more receiver electrodes; and dielectric layer arranged between the transmitter electrode and receiver electrodes. The control circuit is connected to the electric field sensor and configured to: drive the transmitter electrode to transmit a reference signal to establish a quasi-static electrical near field; and process one or more measurement signals received by the one or more receiver electrodes respectively, each measurement signal is indicative of a distortion of the quasi-static electrical near field due to proximity of an object.

The application relates to a method of an electric field sensor based on an optoelectronic oscillator, belonging to the field of optical devices and optical fiber sensing. The device comprises a laser source, a polarization controller, a phase modulator, a fiber Bragg grating with an acrylate glue cavity, a stacked piezoelectric ceramic, an electric field generator, an erbium-doped fiber amplifier, a photodetector, a power divider and an electric amplifier. The stacked piezoelectric ceramic is combined with the fiber Bragg grating with the acrylate glue cavity as a sensing head, the wavelength change of the fiber Bragg grating with the acrylate glue cavity caused by the piezoelectric effect is mapped to the frequency change of the microwave signal generated by the optoelectronic oscillator, and the electric field change value can be obtained by monitoring the microwave signal of the optoelectronic oscillator. In the loop of the optoelectronic oscillator, the electric spectrum analysis technology is used for demodulation, and high-speed and high-resolution electric field measurement can be obtained. The method has the advantages of simple structure, high measurement sensitivity and easy practicability.

The invention discloses an electric field sensor field enhancement cover plate and a preparation method thereof, and belongs to the technical field of micro electro mechanical system manufacturing. The method comprises the following steps: etching a groove on the silicon surface of a silicon wafer or an insulator to form a reinforcing structure; preparing a flat to-be-bonded surface through a bonding and thinning process; performing laser cutting on the glass sheet to form a reserved hole; and bonding the glass sheet and the bonding surface to form the cover plate. Optional steps include sputtering a getter and a metal bonding layer. The bonding process is used for replacing traditional glass backflow, two photoetching steps are omitted, the problems that glass filling is uneven and the surface is uneven are solved, the technological process is remarkably simplified, and the yield is improved. The method is suitable for wafer-level electric field sensor packaging, and the sensitivity and reliability are improved.

The invention discloses a photoelectric sensor system conversion efficiency calibration system and method based on a reverberation chamber, and belongs to the technical field of photoelectric sensor conversion efficiency calibration, the system comprises an electric wave reverberation chamber, a transmitting antenna, a reference antenna and a photoelectric field sensor system; the photoelectric field sensor system is composed of a photoelectric sensor, a laser source, a photoelectric detector, a polarization maintaining optical fiber and a single-mode optical fiber. In the calibration process, the reference antenna and the photoelectric sensor system are used as receiving ends respectively, receiving power at different stirring positions in the reverberation chamber is sampled to obtain two groups of transfer functions, and the total efficiency of the photoelectric sensor system is determined by comparing the two groups of transfer functions under the condition that the radiation efficiency of the reference antenna is known. The conversion efficiency of the photoelectric sensor system is obtained by combining the relation among the power, the field intensity and the total efficiency in the free space; and the effective averaging of the incident direction and the polarization state is realized by using the uniform and isotropic electromagnetic field characteristics of the reverberation chamber.

The application relates to a reflective optical electric field sensor based on a lithium niobate thin film material, which adopts lithium niobate thin film material as a sensor base body, and forms a gradually-changing coupling structure, a polarization selection structure, a reflective MZ electro-optic modulator, a wideband high-gain electrode and an antenna structure on the lithium niobate thin film material in sequence along the light path propagation direction, wherein the reflective MZ electro-optic modulator only comprises a Y-branch optical waveguide, and a Bragg reflection grating is arranged on the parallel waveguide arms of the Y-branch optical waveguide; through input laser signals of the sensor, an electric field signal can be modulated on the laser, and the modulated laser is transmitted by using a long optical fiber; the rear end is demodulated by using a photoelectric detector and is sent into a receiver for measurement, and the measured electric field information can be obtained. The sensor has the advantages of simple structure, saved output optical fiber, small size, high sensitivity, small interference, accurate electric field measurement result and high measurement repeatability.

The invention discloses a preparation method of a breakable sectional multi-channel electric field sensor array. The preparation method comprises the following steps: stripping a first insulating layer of a first metal wire at a certain interval, and then welding a conductive material to form an electrode contact to obtain a second metal wire; a second metal wire penetrates into the insulating tube, and a window is formed in the area corresponding to the electrode contact; a second metal wire and an insulating tube are welded in a non-exposed area between the electrode contacts to form a weak interface insulating section; the area, corresponding to the windowing, of the insulating tube is wrapped with a reflecting layer, and light-cured resin is coated for curing to form a second insulating layer; a breaking guide groove is shallowly etched in the area, corresponding to the weak interface insulation section, of the second insulation layer, and curing is carried out to form a breakable sectional type probe; and arranging to form a multi-channel electric field sensor array. The invention further discloses the multi-channel electric field sensor array obtained by the method and application of the multi-channel electric field sensor array in an intracranial electric field intensity distribution measuring device. The multi-channel electric field sensor array has the advantages of high spatial resolution, high anti-interference capability and mechanical-electrical stability.

The disclosure relates to a method for detecting faults in electrically active systems (3) in a subsea entity (1,1'), comprising: providing at least two electrodes (2) being pared to provide at least one electric field sensor arranged in a subsea entity (1,1') for measuring electric fields (3') stemming from faults in electrically active systems (3) in the subsea entity (1,1'), providing a processing means (6) for receiving and processing data from the electric field sensors, measuring the electric fields (3') originating from the subsea entity (1, 1') with the at least one electric field sensor, and determining by the processing means (6) to what extent the electric field (3') deviating from an expected electric field baseline of the subsea entity (1, 1').

The invention relates to the technical field of electric power operation protection, in particular to an intelligent electricity approaching early warning bracelet which comprises a wrist strap and a host, the host comprises a shell arranged in the host, a main control board is arranged in the shell, a main control MCU is arranged on the main control board, and a storage battery, an electricity approaching detection chip, an early warning module and a communication module are further integrally arranged on the main control board. The storage battery, the electricity approaching detection chip, the early warning module and the communication module are all connected with the main control MCU, the electricity approaching detection chip is connected with an electricity approaching electric field sensor and an electricity approaching induction line which are arranged on the wrist strap and used for electricity approaching induction, and the early warning module is connected with a buzzer and a vibration motor which are arranged in the host and used for electricity approaching early warning; the intelligent bracelet has the function of monitoring the change of a surrounding electric field in real time, can send an early warning signal to other nearby bracelet wearers, and can also facilitate background monitoring of the operation position and state of the wearers, thereby remarkably improving the active protection capability and emergency response efficiency of power operation.

The present disclosure provides a piezoelectric self-feedback excitation type micro electric field sensor, an electric field detection method and a sensor, and is applied to the technical field of electric field sensors. The piezoelectric self-feedback excitation type micro electric field sensor comprises: a substrate for supporting a vibration pickup reference structure, a piezoelectric driving structure, a mutual shielding electric field sensing structure and an elastic beam; the piezoelectric driving structure is used for deforming the piezoelectric driving structure to make the elastic beam vibrate when a driving voltage is applied to the piezoelectric driving structure; the mutual shielding electric field sensing structure is used for outputting a differential form of a sensing current signal in response to the vibration of the elastic beam, so as to suppress common mode noise and detect the amplitude strength of the electric field to be measured; the vibration pickup reference structure is used for outputting a reference current signal in response to the vibration of the elastic beam, so as to adjust the size of the driving voltage, so that the output sensitivity of the piezoelectric self-feedback excitation type micro electric field sensor is a predetermined value.

Capacitive control unit (1) for a motor vehicle with a capacitive sensor element (31) designed as a self-capacitance sensor, which is designed to generate an electric field and to detect a change in the generated electric field, with a switching arrangement (10) which is designed to effect a change in the electric field when actuated by an operator (70), as well as with a cover element (20) having a visible side (21) and a back side (23), wherein the switching arrangement (10) is arranged on the visible side of the cover element (20) and the capacitive sensor element (31) is arranged on the rear or visible side of the cover element (20), wherein the switching arrangement (10) comprises a coupling electrode (11) coupled to the electric field, a sensor electrode (12) and at least two switching elements (40) as well as at least one coupling magnet (26) which is configured to magnetically fix the switching arrangement (10) at a predetermined position on the cover element (20). wherein the coupling electrode (11) is electrically connected to the switching elements (40) and these to the sensor electrode (12), which is capacitively coupled to a counter electrode (32) to stabilize a reference potential, wherein each of the switching elements (40) is assigned a predetermined capacitance (13, 14), so that when the respective switching element (40) is actuated by the coupling electrode (11) a change in the electric field can be effected which depends on the respective assigned capacitance (13, 14) and can be detected by the sensor element (31).

The application discloses a field-circuit coupling-based molded case circuit breaker arc energy dissipation prediction system and relates to the technical field of circuit breaker arc energy prediction.The system comprises a multi-modal data acquisition module, a cross-modal feature fusion module, a prediction model construction module, a working condition self-adaptive adjustment module and a prediction output module.The application realizes accurate prediction of double-break molded case circuit breaker arc energy dissipation through multi-modal data acquisition and cross-modal feature fusion.Synchronous acquisition of multi-dimensional feature data is realized through arrayed optical fiber electric field sensors, miniature Hall sensor arrays, hyperspectral imaging units, infrared thermographs and other equipment, covering the full-space field of the arc-extinguishing chamber, and through dynamic weight distribution and physical correlation degree calculation, data heterogeneity among modes is eliminated, a fusion feature vector is generated, the representation capability of arc dynamic behavior is improved, the error between the prediction value and the actual dissipated energy is low, and the problem of poor working condition adaptability of traditional models is solved.

The application discloses a distribution network non-power-off operation risk early warning method and device and computer equipment, and relates to the technical field of distribution network operation safety. The method is to firstly correlate the position and the electric field intensity according to the Kinect bone data collected by a Kinect device in real time and the electric field intensity collected by a MEMS electric field sensor in real time, obtain the electric field intensity measured values at multiple measuring points, then inversely obtain the electric field three-dimensional distribution of the distribution network non-power-off operation site, and finally determine the corresponding current electric field intensity according to the electric field three-dimensional distribution and the corresponding current position of each human body joint point, and determine whether there is a human body electric shock risk, if yes, trigger the early warning action, so that the operation personnel can be reminded to correct the mistake in time, further personnel electric shock safety accidents can be avoided, the safety of the operation personnel and equipment can be ensured, and the practical application and popularization are facilitated.

The invention relates to an inspection method and system for multi-branch distribution line fault positioning, and belongs to the technical field of power system fault detection. The method comprises the following steps: injecting a double-index high-voltage signal with a continuous conductive characteristic into a power failure line through a signal injection device so as to excite an obvious fault reflection wave; collecting a reflected wave signal at an injection point by using a coupled electric field sensor; wVD time-frequency conversion is carried out on the signals received by the upper computer, a time energy curve is generated, and the arrival time of reflected waves is accurately calibrated according to the peak value of the curve; and the distance of reflection points is calculated in combination with the wave velocity, and a fault branch and an accurate position are determined through comparison of a segmented inspection strategy and a line topology. According to the system, the telescopic rod, the signal injection device, the sensor and the upper computer are integrated, and single-point movement measurement is achieved. The technical problems that weak fault features such as high-resistance grounding are not obvious, traditional traveling wave signals are prone to distortion and difficult to detect, and multiple branch lines need a large number of synchronous sensors are effectively solved.

The application relates to the technical field of electric field measurement, in particular to a multifunctional ship electric field and magnetic field measuring device, which comprises a circular chassis, a controller, a mounting cabin, a detection mechanism, a fixing mechanism and an adjusting mechanism, the adjusting mechanism comprises a rotating assembly and two telescopic rods, the detection mechanism comprises a mounting plate, a power supply assembly, a data processing assembly and a monitoring assembly, the telescopic assembly, the power supply assembly, the data processing assembly and the monitoring assembly are electrically connected with the controller, the multifunctional ship electric field and magnetic field measuring device can measure the electric field and the magnetic field generated by a ship, and the measured data can be sent to the PC end of the control center through the controller, so that the detection personnel can conveniently check and record the measured data in time, meanwhile, the device is convenient to salvage, can realize automatic cleaning function, and can guarantee the continuous and normal operation of the magnetic field sensor and the electric field sensor.

The invention discloses a transformer substation high-voltage wire electricity testing and grounding hanging ring, relates to a transformer substation high-voltage wire overhauling device, and aims to solve the problems of insufficient safety, complicated operation, low efficiency and poor adaptability in the existing high-voltage wire electricity testing and grounding operation. A main body bearing ring is used for being connected with a grounding wire; the grounding hanging part is arranged on the main body bearing ring, and an ear hanging hole is formed in the end side wall of the grounding hanging part; the ear hanging hole is used for hanging a high-voltage wire; the non-contact electric field sensor is embedded in the grounding hanging part and is used for identifying whether the high-voltage wire hung in the ear hanging hole is electrified or not; the audible and visual alarm is arranged on the grounding hanging part, the audible and visual alarm is connected with the non-contact electric field sensor, and when the non-contact electric field sensor recognizes that the high-voltage wire is electrified, the audible and visual alarm gives an audible and visual alarm. The beneficial effects are that whether the high-voltage wire is carried or not can be conveniently detected, accurate judgment of a'no-power 'state is ensured, and the device is high in safety, simple in operation, high in working efficiency and strong in adaptability.

The invention provides an anti-lightning protection method and system for a wind turbine generator. The method comprises the steps that S1, an electric field sensor is used for monitoring the intensity of an environment electric field; s2, when the environment electric field intensity exceeds a first-level early warning threshold value, a loop resistance detection unit is started, and ground resistance values of lightning protection channels of three blades of the wind turbine generator set are detected respectively; s3, classifying the three blades according to the resistance to ground values, and screening out a preferable lightning receiving blade; s4, continuously monitoring the environment electric field intensity, and executing a shutdown lightning protection strategy when the environment electric field intensity exceeds a second-level action threshold value; and S5, in the shutdown lightning protection strategy, a yaw system and a variable pitch system of the wind turbine generator are controlled, the screened optimal lightning receiving blade is locked at a vertically upward position to serve as a target lightning receiving blade, and an auxiliary grounding device installed between the main shaft and the tower drum is closed. According to the method, the blade in the optimal state can be selected as the lightning arrester through self-inspection, and the posture of the unit is adjusted to achieve optimal drainage.

The invention discloses a vehicle-mounted thunder and lightning early warning method and system, electronic equipment and a storage medium, and relates to the field of vehicle safety early warning, and the method comprises the steps: obtaining thunder and lightning early warning data of a target vehicle position, target vehicle surrounding electrostatic field intensity data and vehicle surrounding cloud layer charge density data, and the thunder and lightning early warning data comprises a thunder and lightning probability and thunderbolt time; obtaining a lightning risk dynamic arbitration algorithm, wherein the algorithm comprises cloud data verification and local sensing verification; the cloud data verification comprises the following steps: if the lightning probability is greater than a preset threshold and the thunderbolt time is less than a preset time threshold, activating an electric field sensor; the local sensing verification comprises the following steps: if the electrostatic field intensity is greater than a preset threshold value, activating the millimeter wave radar; if the charge density is greater than a preset threshold value and / or the electrostatic field intensity is greater than a preset threshold value, entering risk confidence coefficient calculation; and triggering corresponding early warning and protection actions according to the risk confidence.

The present application belongs to the field of DC power transmission system operation and maintenance technology, and particularly relates to a method and system for measuring the uneven coefficient of the breaker gap voltage distribution. The present application applies a DC voltage to one side of the double gap, and the other side is grounded. One of the gaps is composed of a ball gap and a loop. The gap voltage is directly measured through the ball gap induction, which eliminates the influence of factors such as partial discharge, surrounding equipment corona, circuit breaker support, etc. and ensures that the measured breaker gap and the measurement ball gap main part are non-contact, which can avoid introducing a parallel resistance-capacitance loop and improve the measurement accuracy. The present application directly converts the electric field value into the voltage value of the two ends of one of the gaps by setting an electric field sensor inside the ball to calculate the uneven coefficient, without making the discharge ball gap break down. The measurement voltage can be flexibly adjusted, and the distance between the ball gaps is fixed when the measurement voltage is changed, so there is no need for adjustment, thus improving the measurement efficiency.