507 results about "Electric arc discharge" patented technology

Apparatuses including spark gap structures for electrical overstress (EOS) monitoring or protection, and associated methods, are disclosed. In an aspect, a vertical spark gap device includes a substrate having a horizontal main surface, a first conductive layer and a second conductive layer each extending over the substrate and substantially parallel to the horizontal main surface while being separated in a vertical direction crossing the horizontal main surface. One of the first and second conductive layers is electrically connected to a first voltage node and the other of the first and second conductive layers is electrically connected to a second voltage node. The first and second conductive layers serve as one or more arcing electrode pairs and have overlapping portions configured to generate one or more arc discharges extending generally in the vertical direction in response to an EOS voltage signal received between the first and second voltage nodes.

The invention discloses a power transformer arc discharge multi-parameter detection simulation platform and a fault diagnosis method, and relates to the technical field of power system equipment state monitoring and fault diagnosis. The platform comprises a transformer body, a replaceable discharge module, a multi-parameter sensing unit and a signal processing and diagnosis module, and can truly reproduce various typical arc discharge faults of a needle plate, an air gap, a creeping surface, turn-to-turn and the like. The sensing unit is integrated with ultrahigh frequency and ultrasonic sensing probes, high-frequency current and voltage sensors, optical fiber temperature / pressure / strain sensors and the like, so that synchronous acquisition of multi-physical field signals is realized. According to the diagnosis method, through wavelet denoising and multi-dimensional feature extraction, a feature vector of multi-state parameter fusion in the process from partial discharge to arcing is constructed, and accurate classification of fault types is realized by using a support vector machine (SVM) model. The diagnosis method has high accuracy and early warning capability, effectively overcomes the limitation of single parameter diagnosis, and provides reliable technical support for transformer fault research and intelligent operation and maintenance.

The invention provides embedded metal fullerene and a preparation method thereof. The preparation method comprises the following steps: mixing a metal source and graphite powder, and filling a hollow graphite rod with the mixture to prepare an anode; the electrode is installed at the anode end of an electric arc furnace, and on-line activation is conducted through anode and cathode short-circuit current under the inert atmosphere; then carrying out arc discharge under specific air pressure and current, and collecting generated carbon ash; performing ultrasonic extraction by using an organic solvent to obtain a fullerene crude extracting solution; and finally, performing multi-stage separation and purification by high performance liquid chromatography, and performing primary and fine separation by sequentially adopting preparative and semi-preparative chromatographic columns to obtain a high-purity product. According to the method, a complete technical path capable of efficiently and controllably preparing the ultra-high-purity embedded metal fullerene is formed through a synthesis process integrating online activation and accurate atmosphere regulation and control and a multi-stage gradient chromatography purification strategy, and a solid foundation is laid for application of atomic-scale accurate materials in the frontier fields of quantum devices and the like.

The invention relates to plasma etching equipment, an etching machine table, a focusing ring and a jacking structure thereof, the focusing ring comprises a plurality of stacked ring bodies, the ring bodies are mutually independently arranged, the axial size of the ring body located on the uppermost layer is larger than the maximum jacking height allowed by the focusing ring, and the jacking height of the focusing ring is larger than the maximum jacking height allowed by the focusing ring. According to the split type focusing ring provided by the invention, in the use process, each ring body can be jacked, so that a large space below the whole jacked original focusing ring is divided into a plurality of small spaces through each ring body, and the small spaces are connected only through small slits among structures; and the concentration and activity of charged particles of the plasma in the small space are limited, so that the purposes of preventing the arc discharge phenomenon and avoiding the generation of sparking traces or the fragmentation of the focusing ring are achieved.

The invention provides a device and a method for producing ammonium nitrate by taking air and water as raw materials. Compared with the prior art, the device is composed of the nitrogen generator, the plasma discharge device, the fixed bed reactor and the absorption tower, sliding arc discharge is adopted, the fixed bed reactor is heated through heat generated by discharge, NH3 and NOx are synthesized through nitrogen and water discharge, and the ammonium nitrate solution is finally obtained through oxidation absorption. According to the method, only air and water are used as raw materials, high-temperature and high-pressure reaction conditions in the industrial ammonium nitrate synthesis process are avoided, the synthesis process driven only by renewable energy sources is realized, and the method can be applied to the scenes of distributed energy storage, small-scale production of agricultural nitrogen fertilizers and the like.

The invention discloses a method for calculating static pressure generated by arc discharge in a transformer oil tank, and the method comprises the steps: obtaining an expansion coefficient c of the transformer oil tank; electric arc time-varying power P (t) and energy W (t) of electric arc discharge in the transformer oil tank are obtained through calculation; the arc discharge product temperature T of arc discharge in the transformer oil tank is obtained; a gas space V0 existing in the transformer oil tank is measured, and the amount Vg of gas dissolved in oil is calculated according to the solubility kh of characteristic gas generated by the electric arc in the oil; and calculating static pressure p generated by arc discharge in the transformer oil tank according to a static pressure calculation formula.

The invention belongs to the technical field of electric power, and discloses an isolating switch which comprises a base, a second insulating column fixedly mounted at the top of the base, a static contact pad fixedly mounted at the top of the second insulating column, and a disconnecting link assembly hinged to the static contact pad, and the butt joint assembly is fixedly arranged at the top of the base. According to the invention, the disconnecting link main body is driven by an electric motor or a hand wheel to rotate by taking the hinged part of the disconnecting link main body and the static contact pad as a center shaft, so that the butt joint piece falls into the top of the moving contact pad, the butt joint piece pushes the two sliding frames, the conductive piece and the butt joint toothed plate to move relatively, and the butt joint toothed plate is engaged with racks on two sides of the butt joint piece; the contact area of the butt-joint piece and the butt-joint toothed plate is increased through meshing of the multiple racks, the phenomenon of deformation caused by thermal expansion and cold contraction is avoided, meanwhile, the butt-joint piece and the butt-joint toothed plate are in surface contact all the time, the effective conductive section is guaranteed, local overheating and arc discharge are avoided, and the reliability of circuit on-off is guaranteed.

The invention relates to the technical field of pulse state recognition, in particular to an electric spark discharge pulse state recognition and control system and method.The electric spark discharge pulse state recognition and control method comprises the following steps that gap voltage is obtained, and whether the gap voltage is rising edge voltage or not is judged; comparing the gap voltage which is judged to be the rising edge voltage with a preset threshold voltage; when the gap voltage is the same as any one of the preset threshold voltages, a trigger state identifier is set to be 1, and counting is started from a preset value A1; when any one of counting stopping conditions is met, counting is stopped, the state identifier is reset, and the counting value is returned to the preset value A1; calculating delay time between two time points of counting starting and counting stopping; judging the delay time and outputting a judgment result; and performing control according to the judgment result. According to the invention, based on the pulse voltage threshold and the time characteristic, the short-circuit arc pulse and the arc discharge pulse are rapidly and accurately identified.

The invention relates to a deicing method, system and device based on gas-liquid discharge mode conversion and intelligent regulation, and the method comprises the steps: monitoring and predicting an icing state, and adjusting the output of a multi-gear adjustable power supply according to a prediction result, so as to generate weak spark discharge; when the icing condition is met, the needed energy is calculated according to the monitoring data to adjust the output of the multi-gear adjustable power supply so as to generate dielectric barrier glow discharge, and the discharge parameter is dynamically adjusted to maximize the strong heat input effect; the forming time and position of a gas-liquid mixture cavity under the condition of dielectric barrier glow discharge are predicted in real time by introducing a thermodynamic principle and an ice layer melting model, and after the cavity is detected to be formed, the optimal opportunity and energy of strong arc discharge are determined according to cavity parameters; therefore, the output of the multi-gear adjustable power supply is adjusted to generate strong arc discharge, and the cavity of the gas-liquid mixture is induced to expand and break, so that the ice layer falls off. The invention provides a more efficient, environment-friendly and reliable deicing solution.

The invention provides a preparation method of a high-entropy alloy catalyst, which comprises the following steps: weighing at least five metal precursors such as iron, nickel, cobalt, magnesium, aluminum, niobium and tungsten according to a certain molar ratio, premixing solid powder by a mechanical ball milling method, filling the mixed powder into a crucible of an electric arc melting furnace, placing a reaction device in an inert atmosphere, and carrying out ball milling to obtain the high-entropy alloy catalyst. And material oxidation is prevented. Through arc discharge, the raw materials are melted in a rapid heating mode, and meanwhile in the melting process, electromagnetic stirring is used for ensuring that the materials are fully mixed and homogenized. And after smelting is completed, a melt is rapidly cooled and solidified under the action of a cooling system, after a sample is completely cooled, the crucible is taken out, thermal reduction is conducted in a reducing atmosphere, and the ammonia decomposition high-entropy alloy catalyst is obtained. The catalyst prepared by the invention has the characteristics of high activity, short preparation process time and high homogenization degree.

The invention discloses an equivalent experiment method for pressure generated by arc discharge in transformer oil, and the method comprises the steps: injecting gas into an oil tank filled with the transformer oil, and measuring the pressure in the oil tank to obtain the steady-state pressure ps in the oil tank; the temperature of the injected gas is judged, and if the injected gas is normal-temperature gas, the peak pressure pmax of equivalent arc discharge is calculated according to the gas production temperature peak value Tmax; if the temperature of the injected gas is equal to the temperature of the arc generated gas, the pressure peak value generated by the injected gas is the equivalent arc discharge peak value pressure pmax, and the injected gas is the steady-state pressure ps in the oil tank after being cooled to the room temperature; measuring the volume Vg of the injected gas; according to the relation between the gas volume and the arc energy, equivalent arc discharge energy Earc is calculated; and comparing the pressure waveform generated by discharge when the arc discharge energy is Earc with the pressure waveform of the equivalent experiment, and verifying the feasibility of the equivalent method.

The invention discloses a spectral analysis method and device for an arc discharge decomposer of a mixed environment-friendly gas, and the method comprises the steps: injecting the mixed environment-friendly gas into an arc discharge device, and setting discharge parameters; the mixed environment-friendly gas comprises perfluoroisobutyronitrile and carbon dioxide; the discharge parameters at least comprise discharge current and discharge voltage; controlling the arc discharge device to perform arc discharge so as to decompose the mixed environment-friendly gas to generate a decomposer; collecting decomposed products through a gas collecting device, and pretreating the decomposed products; analyzing the preprocessed decomposer through a spectrum instrument to obtain spectrum data; the spectral data at least comprises wavelength, intensity and peak value; acquiring a characteristic spectral line of the decomposer according to the spectral data; determining the type and the measurement concentration of the decomposer according to the standard database and the characteristic spectral line; and checking and correcting the measured concentration of the decomposer. According to the technical scheme provided by the invention, the reliability and the accuracy of decomposition product detection are improved.

The invention discloses a safe operation method and an equipotential system for an aerial operation robot, and the method is characterized in that the safe operation method comprises the following steps: a drainage guide rod of the equipotential system is arranged at the bottom of a foot stool and is connected with an overhead line when approaching the overhead line, and a tensioning reset mechanism keeps the drainage guide rod to be in contact with the overhead line during landing; it is ensured that the aerial work robot and the overhead line are in an equipotential state in the landing process, and damage to components on a machine body of the aerial work robot caused by arc discharge is avoided; the traveling wheels form stable equipotential after riding to the overhead line, the driving mechanism drives the drainage guide rod to be separated from the overhead line, and the drainage guide rod is limited by the limiting device, so that electric arc and fire caused by long-time friction between the drainage guide rod and the overhead line during operation movement are avoided; limiting is relieved after operation, the tensioning reset mechanism enables the drainage guide rod and the overhead line to recover connection and keep connection, the flying-away aerial operation robot and the overhead line are in an equipotential state, and the equipotential system is closed or dormant after the flying-away aerial operation robot is separated from the overhead line.

The invention provides a directional ultra-short strong field electromagnetic pulse generation device, a plasma channel is formed through laser targeting gas and ultra-short strong field electromagnetic pulses are generated, the device comprises a high-power laser, a laser focusing module, a gas target module and a vacuum cavity, the high-power laser is used for generating femtosecond laser pulses and emitting the femtosecond laser pulses into the vacuum cavity; the laser focusing module is arranged in the vacuum cavity and is used for focusing femtosecond laser pulses generated by the high-power laser onto the gas target; the gas target module is arranged in the vacuum cavity and used for generating a high-density gas target and spraying the high-density gas target upwards, and a gas spraying opening of a gas target nozzle is located below the laser focus and can be adjusted in an electric control mode. According to the invention, escape electrons with charge quantity larger than that of a solid target and a low-density gas target can be generated, and laser forms arc discharge similar to thunder and lightning cloud in near-critical density plasma to generate EMP, so that electromagnetic radiation which is stronger than that of the solid target and far better than that of a common gas target can be generated.

The invention provides a power distribution cabinet arc discharge defect detection method, and belongs to the technical field of power distribution cabinet arc discharge defect detection, and the method comprises the steps: building an electric field intensity dense matrix through analyzing historical data and a simulation model, and carrying out the Fourier transform to obtain a frequency domain feature set; and a multi-branch hybrid neural network model is trained by comparing feature differences of normal and defect samples. And performing the same data processing and feature extraction on the power distribution cabinet to be tested, inputting an obtained difference feature set into the trained model, and predicting a possible arc discharge position. According to the method, the technical advantages of modern signal processing and machine learning are fully utilized, simulation analysis and experimental testing are combined, rich feature information contained in electric field data is deeply excavated, accurate identification and quantitative evaluation of arc discharge defects are achieved through deep analysis of the electric field data in the power distribution cabinet, and the accuracy and the reliability of the arc discharge defects are improved. The problems of low detection precision and high cost in the prior art are solved.

The invention discloses a high-precision circuit breaker for fault arc pre-detection, and the circuit breaker comprises a flame-retardant auxiliary housing which is internally and fixedly provided with a filter circuit template; the flame-retardant main shell is matched and covered with the flame-retardant auxiliary shell; the mechanical circuit breaking template is fixedly installed in the flame-retardant main shell, a binding post A and a binding post B are installed on the front faces of the upper end portion and the lower end portion of the mechanical circuit breaking template respectively, the binding post A is connected with a coil assembly installed in a coil groove in the front face of the mechanical circuit breaking template through a first wire, and the binding post B is connected with a second wire through a third wire. And the binding post B is connected with a metal sheet fixed on the front surface of the mechanical circuit breaking template. The device has the function of detecting various types of arc discharge (including parallel arc, series arc and ground arc) in a power grid environment, and once fault current is detected, the tripping module carries out arc circuit breaking.

The invention discloses a method and system for calculating the average temperature of arc discharge products in a transformer oil tank, and the method comprises the steps: carrying out an arc discharge experiment in a sealed oil-filled tank body of transformer oil, and measuring the arc discharge voltage, current and pressure waveform, the volume of the arc discharge products at room temperature, and the corresponding pressure in the oil tank; the time-varying temperature T (t) of the discharge product during arcing is obtained by calculating the discharge static pressure pL (t) obtained by measurement; calculating the temperature of a discharge product after arc quenching; and obtaining an average temperature change curve of the discharge product at different time stages based on the time-varying temperature of the discharge product during arcing and the average temperature of the discharge product after arc quenching.

The invention provides a method for preparing nano nickel powder by using plasma. The method comprises the steps that a nickel-containing material serves as an anode, plasma working gas and arc discharge are conducted in a vacuum reaction chamber till the reaction is finished, the reaction chamber is vacuumized, passivation gas is introduced into the reaction chamber, the nanometer nickel powder is obtained after passivation treatment is completed, the plasma working gas is mixed gas composed of oxygen, hydrogen and first gas, and the first gas is mixed gas. The first gas is any one or more of argon, nitrogen and helium. The nanometer nickel powder prepared through the method is good in dispersity and uniform in granularity, and the problem that the nanometer nickel powder prepared through an original growth path is seriously agglomerated is solved.

Apparatuses including spark gap structures for electrical overstress (EOS) monitoring or protection, and associated methods, are disclosed. In an aspect, a vertical spark gap device includes a substrate having a horizontal main surface and a plurality of pairs of conductive layers over the horizontal main surface. Different ones of the pairs are separated by different vertical distances such that each pair serves as an arcing electrode pair and different ones of the arcing electrode pairs are configured to arc discharge at different voltages.

The invention discloses a segmentation characteristic analysis method for dynamic pressure generated by arc discharge in transformer oil, and the method comprises the steps: carrying out an arc discharge experiment in a sealed oil-filled tank body of the transformer oil, observing the motion of bubbles generated by discharge, and measuring the voltage, current and pressure waveform of the arc discharge; analyzing the diameter change of the discharge bubble based on the bubble motion, and generating the frequency band characteristics of the pressure waveform based on the pressure waveform; carrying out arc discharge experiments with different energies, different boundary conditions and different current waveforms, and comparing the pressure waveforms to obtain influence factors of the pressure waveforms; according to the diameter change of discharge bubbles of arc discharge and the frequency band characteristics of arc discharge voltage, current and pressure waveforms, the segmentation characteristics of discharge pressure are formed.

Provided are an uninterruptible power supply (UPS), a method and an apparatus for soft starting the UPS, and a controller. In the UPS, an inverter circuit is provided with three-phase output terminals, and two output terminals of a pre-charge circuit are electrically connected to output terminals of any two phases, respectively. The UPS charges a bus capacitor through an energy storage operation and a freewheeling operation, so that a voltage of the bus capacitor is greater than a peak value of a mains power. When the mains relay is powered on, a voltage of an end of the mains relay that is electrically connected to the mains power is lower than the voltage of the bus capacitor. Due to limitation of a conduction direction in a rectification circuit, no inrush current occurs, thereby reducing arcing of relay contacts and improving stability of the UPS during a power-on process.

The invention relates to the technical field of power system fault simulation, and discloses a DC fault simulation method for a medium-voltage DC system, and the method comprises the steps: constructing an equivalent circuit containing line distribution parameters, and representing the transmission characteristics of resistance, inductance and capacitance per unit length, a linear mathematical model of arc voltage and arc length is established based on arc discharge experiment data, a dynamic resistance curve is generated in combination with an arc length time increase function, an initial value and a change rate of dynamic resistance are extracted as characteristic parameters, and a mapping relation table of the characteristic parameters with metallic short circuit and mild / severe arc faults is established. And according to a target fault type, matching a dynamic resistance parameter, injecting the dynamic resistance parameter into an equivalent circuit, solving a differential equation containing a time-varying resistor, and outputting a high-fidelity DC fault current signal. The method solves the problem that static resistance simulation cannot reproduce arc dynamic characteristics, and significantly improves the accuracy of fault simulation.

The utility model provides an arc light protection pre-alarm system of a middle and low voltage switch cabinet. The arc light protection pre-alarm system comprises an arc discharge generating device, a sensor, a signal conditioning device and a computer. According to the arc light protection pre-alarm system of the middle and low voltage switch cabinet, arc light, arc sound and over-current signals generated by the arc discharge generation device are respectively and simultaneously collected, and signals capable of representing essential characteristics can be found out at a computer end; the arc sound signal is used as an early warning signal for generating a fault arc, the arc light and the current signal are used as an alarm protection signal for generating the fault arc, the signals are monitored, and the early warning signal is sent out before abnormity occurs in the switch but arcing is not generated, so that the fault arc is choked and killed in a cradle; in other words, the detection is started when the electric arc occurs, the traditional passive mode is changed into the active mode, precious time is bought for workers to find and eliminate faults in time, and possible losses are reduced to the minimum.

The invention provides a spark discharge device and a spark discharge accurate control method, and relates to the technical field of spark discharge. The device comprises a pair of spark electrodes, a rotary switch, a capacitor and a power supply, wherein a gap exists between working ends of the spark electrodes; the spark electrode, the rotary switch and the capacitor are connected in series to form a discharging loop, and the capacitor and the power supply are connected in series to form a charging loop; the rotary switch comprises a rotatable rotor and a toothed bar connected with the rotor; a contact is arranged in the discharge loop, and when the contact is in contact with the toothed bar, the discharge loop is conducted. According to the invention, the discharge loop is rapidly switched on and switched off through the rotary switch, various parameters of spark discharge can be accurately and stably controlled, so that the spark discharge is not influenced by the environment, such as spark breakdown voltage, discharge frequency and the like, and the spark discharge can be prevented from being converted into corona, glow or arc discharge, for example, the spark discharge can be normally generated under low air pressure.

The invention provides a process debugging method for preparing a thin film by utilizing reactive magnetron sputtering, which comprises the following steps of: 1, determining the target working power of the reactive magnetron sputtering and the target flow of working gas according to the arc discharge condition of the surface of a target material; 2, based on the target working power and the target flow of the working gas, the surface roughness of the thin film prepared through reaction magnetron sputtering is measured under different powers of the auxiliary source, and the auxiliary source power corresponding to the surface roughness smaller than 0.2 nm is determined as the target auxiliary source power; 3, based on the target working power, the target flow of the working gas and the target auxiliary source power, the absorption loss of the film on the surface of the substrate is tested through a weak absorption analysis method by using the reaction gas with different flows, and the absorption loss is used for representing the reaction degree of preparing the film through reaction magnetron sputtering. A reaction gas flow rate corresponding to an absorption loss satisfying 10 ppm or less is determined as a target reaction gas flow rate.

The invention relates to a layered cathode structure based on functional layer-buffer layer alternate distribution and a rapid trial-manufacturing method thereof, and belongs to the technical field of machining, the layered cathode structure comprises a functional structure surface layer and a matrix, and the functional structure surface layer is further formed by stacking and alternately arranging a plurality of sub functional layers and buffer layers. In actual service, a refractory oxide layer is generated in situ on the basis of the functional layer made of the thermochemical material, self-protection is completed, and electrons are emitted to support arc discharge; and the buffer layer is made of a nanocrystalline material with high plastic deformation capacity, so that the thermal stress of the functional layer can be released through proper deformation of the buffer layer, and meanwhile, cathode spot migration can be accelerated when the buffer layer is in contact with a cathode arc so as to slow down cathode burning loss. Through the synergistic effect of the functional layer and the buffer layer, the problems of cracking, splitting and coating falling caused by plasma discharge shock heating and shock cooling of the layered cathode in application scenes such as electric spark machining hole making and electric arc welding are solved, meanwhile, the ablation uniformity is improved, and the ablation rate is reduced.

The invention belongs to the field of material processing, energy and environmental protection, and relates to a large-space high-density discharge plasma device and application thereof.The discharge plasma device is formed by combining a movable micron-sized filiform brush electrode and a matched discharge initiation electrode, the advantages of low-temperature plasma and arc discharge are combined, and high-density discharge is achieved. By controlling the distance between the electrode pairs, large-space high-strength uniform discharge under low initiation voltage is realized. Compared with the prior art, the plasma device provided by the invention has the advantages of wide adjustable range of discharge energy density, large space and multiple purposes.

Methods of monitoring arcing in a process chamber, processing chambers and monitoring apparatus are described. At least one of the angular or radial position of a magnetron is determined in the chamber relative to a reference location on a surface of the substrate using positional information from one or more motors. An arcing profile is generated comprising a plurality of arcing states measured based at least on the determined angular and / or radial position of the magnetron.

The embodiment of the invention discloses a method, a device and a system for identifying abnormal discharge of a sulfur hexafluoride circuit breaker. The method comprises the following steps of: receiving a gas pressure data sequence of the sulfur hexafluoride circuit breaker, which is acquired and uploaded by a sulfur hexafluoride density relay in real time; drawing a gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence; determining a communication mode of performing data communication with the sulfur hexafluoride density relay at the current moment, and obtaining a curve change extreme value of the gas pressure time curve based on the communication mode; and comparing the curve change extreme value with a preset pressure change threshold value, and when the curve change extreme value is greater than the preset pressure change threshold value, judging that abnormal discharge exists in the sulfur hexafluoride circuit breaker. Whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker or not is judged by monitoring the gas pressure sudden increase phenomenon during arc discharge in the sulfur hexafluoride circuit breaker, and the problem that a mechanical density relay cannot monitor an abnormal discharge event in the circuit breaker is solved.

The invention provides an electric arc discharge detection method of a parallel energy storage battery unit and a related product. A plurality of energy storage battery units are connected in parallel, microphones are arranged in the energy storage battery units, battery management systems of the energy storage battery units are configured to detect end currents and end voltages of the energy storage battery units, and the electric arc discharge detection method comprises the steps that the battery management systems judge whether the end currents and the end voltages have electric arc discharge characteristics or not; if yes, the battery management system controls the energy storage battery unit to be disconnected; collecting a sound signal detected by the microphone in the same time period when the electric arc discharge characteristic appears; identifying whether the sound signal has a sound feature in an electric arc generation state or not; and if yes, determining that the energy storage battery unit has an electric arc discharge event. According to the scheme provided by the invention, the electrical arcing identification of the sound signal dimension is carried out according to the sound signal detected by the microphone in the time period when the electrical arcing characteristic appears, so that the judgment is carried out by utilizing the multi-dimensional data, the identification accuracy is improved, and the false detection and the missing detection are reduced.