186 results about "Corona discharge" patented technology

The invention relates to the technical field of high-voltage electrical equipment, and particularly discloses a high-insulating-property thermoplastic sleeve and a method for preparing the same based on a co-extrusion process, the surface of a nonlinear layer is wrapped with an insulating material, so that the corona discharge phenomenon is avoided; and meanwhile, the same thermoplastic material is adopted as the insulating layer (including the first thermoplastic layer and the second thermoplastic layer) material and the base material of the nonlinear layer, so that no obvious interface exists between the insulating layer and the nonlinear layer, charge accumulation is avoided, insulation failure is avoided, the insulation and voltage resistance of the sleeve is improved, and the operation reliability is improved.

The invention relates to a ring main unit intelligent detection and fault early warning method and system. The method comprises the following steps: deploying an ultrahigh frequency sensor, an infrared thermal imager, an ultraviolet sensor and a high-frequency current transformer, and synchronously acquiring multi-modal data such as partial discharge, temperature distribution, corona discharge and grounding current of the ring main unit; carrying out feature extraction on the collected data, wherein the feature extraction comprises a time-frequency statistical feature and a temperature-load correlation feature of the partial discharge signal; the Dempster-Shafer evidence theory is utilized to carry out fusion calculation on the multi-source feature evidence, and confidence coefficients for insulation degradation, poor contact, arc faults and other fault types are obtained; arc fault prediction is carried out in combination with a long-short-term memory network model; and finally executing a grading early warning strategy according to the fault confidence. The problems of low detection reliability and fault early warning lag of a single sensor are solved, early accurate diagnosis and predictive maintenance of the insulation fault of the ring main unit are realized, and the operation safety and reliability of power equipment are remarkably improved.

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 an active lightning triggering device and method for a fan blade. The device comprises two copper rods with tip heads, a protection circuit, a boost lightning circuit and a metal shielding net. The two copper rods are arranged in parallel at the blade tip of the fan blade, one copper rod is directly grounded, and the other copper rod is connected with the boost lightning circuit through the protection circuit; the boost lightning guide circuit comprises a charging capacitor, an inductor, a high-frequency switch and a diode and is used for sensing positive high voltage and dynamically adjusting resonance characteristics so as to enhance voltage difference between thundercloud and a copper rod and trigger uplink and downlink leader to form a discharge channel; the metal shielding net wraps the blade tip and is connected with the grounding device to ensure that lightning current is preferentially discharged through the copper rod, and the blade tip structure is prevented from being damaged. According to the method, environmental meteorology and blade attitudes are monitored in real time, a boosted circuit is started in combination with threshold judgment, and control parameters are optimized by using a remote monitoring platform, so that intelligent lightning protection management is realized. According to the device, by actively exciting corona discharge and accurately guiding a lightning path, the lightning protection efficiency of the blade is remarkably improved, the damage risk of a non-lightning-receiving area is reduced, meanwhile, a maintenance decision is supported through datamation operation and maintenance, and the device is suitable for wind generating set protection in a thunderstorm area.

The invention relates to a rotary jet plasma excitation device and method, and the device comprises a carrier which is provided with a jet hole in the surface; the dielectric barrier discharge assembly is arranged on the surface of the carrier, is coaxial with the jet hole and comprises an insulating dielectric layer, a plurality of high-voltage electrodes and a plurality of low-voltage electrodes, the low-voltage electrodes and the high-voltage electrodes are annularly arranged on the inner side and the outer side of the insulating dielectric layer at intervals, and the single high-voltage electrode and the single low-voltage electrode correspondingly form an independent dielectric barrier discharge unit; the corona discharge assembly is arranged outside the dielectric barrier discharge assembly in a sleeving mode and used for outputting normal main jet flow into the jet flow hole, the corona discharge assembly comprises at least one pair of discharge electrodes, and the at least one pair of discharge electrodes are provided with discharge structures; and the power supply and control assembly comprises a power supply module and an intelligent control module. The rotary jet plasma excitation device can form composite rotary jet, effectively disrupts coherence of a turbulent coherent structure, and realizes efficient flow control.

The embodiment of the invention provides an electric precipitator polar line surface defect identification method and system, and belongs to the technical field of electric precipitation. The method comprises the following steps: acquiring an original digital color image of the polar line in a corona discharge state; generating a grayscale image based on the original digital color image, and constructing a binary image for representing a brightness area according to a preset threshold; performing median filtering and mean filtering in sequence based on the binary image to construct a de-noised binary image, and performing Canny edge detection on the de-noised binary image to generate a halo edge image of a burr tip point; and based on the halo edge image, corona discharge positions and brightness information of two sharp points of each barb are extracted, and a polar line surface defect identification result is output according to a preset normal distribution mode. According to the scheme, the corona discharge characteristics can be stably extracted in complex imaging environments such as high dust and weak light, so that the polar line surface defects can be reliably identified.

The application provides a preparation method of a device based on electrostatic field induced microparticle patterning directional assembly, comprising the following steps: preparing a pre-patterning electrode and printing or depositing the pre-patterning electrode on a substrate to obtain a pre-patterning substrate; uniformly laying microparticles on a lower substrate and placing the pre-patterning substrate between the lower substrate and an upper substrate; forming a controllable electric field between the upper substrate and the lower substrate through corona discharge, and driving the microparticles to deposit on non-conductive areas of the pre-patterning substrate by electric field force to form a patterning conductive channel corresponding to the electrode; and packaging the substrate on which the patterning directional assembly is completed. The application realizes template-free, contact-free and solvent-free patterning directional assembly of microparticles, and has the advantages of simple process, low cost, high efficiency and strong universality. The application can be used to prepare multiple devices such as photoelectric detectors, pressure sensors and flexible electronics, and has important industrial application value.

The invention discloses a plasma-based transformer substation noise reduction system and method, and belongs to the field of transformer substations. The system comprises a high-voltage power supply device, a corona discharge device, a noise acquisition device and a control module, the high-voltage power supply device is connected with the corona discharge device; the control module is respectively connected with the noise acquisition device and the high-voltage power supply device; the corona discharge device comprises a high-voltage electrode and a low-voltage electrode; the noise acquisition device comprises a reference microphone and an error microphone; the control module comprises a signal acquisition unit and a signal conversion unit. The signal conversion unit comprises an A / D conversion circuit, a DSP processor and a D / A conversion circuit. The plasma active noise reduction technology is adopted, low-frequency noise generated by the transformer substation can be effectively controlled, and meanwhile the noise reduction device is simple in structure, small in size and convenient to install. Through the active noise reduction logic of noise collection-signal processing-inverse sound wave generation, the problem that the low-frequency noise of the transformer substation is difficult to control is solved in a targeted mode, and noise reduction is more direct and efficient.

An image forming apparatus (1) includes an apparatus main body (3) and a drum unit (31). The apparatus main body (3) has an opening (27) and a drum unit storage part (21) communicating with the opening (27). The drum unit (31) is detachably attached to the drum unit storage part (21) through the opening (27). The drum unit (31) includes photosensitive drum (41), a corona discharging device (43) and a drum cover (47). The corona discharging device (43) corona-charges the photosensitive drum (41). The drum cover (47) is turnable in a protective posture for covering the photosensitive drum (41) and an exposure posture for exposing the photosensitive drum (41). When the drum unit (31) is attached to the drum unit storage part (21), the drum cover (47) is turned from the protective posture into the expose posture to block a flow path communicating a space around the corona charging device (43) with an outside of the apparatus main body (3).

The invention provides a pulverized coal concentration device based on a charge method and a control method of the pulverized coal concentration device, and belongs to the field of combustion of coal-fired boilers. The problems that a traditional inertia separation technology is low in separation efficiency and prone to abrasion in the low-load stable combustion process of the pulverized coal boiler are solved. Comprising a corona discharge device, a grounding device, a central discharge device, a concentrated pulverized coal pipeline and a light-phase pulverized coal pipeline, a guide plate is arranged at an inlet of the concentrated pulverized coal pipeline, one end of the light-phase pulverized coal pipeline is inserted into the concentrated pulverized coal pipeline, and the other end of the light-phase pulverized coal pipeline is located on the outer side of the concentrated pulverized coal pipeline; the corona discharge device is arranged on the outer side wall, corresponding to the insertion section of the light-phase pulverized coal pipeline, of the concentrated pulverized coal pipeline, the grounding device is of an annular structure and arranged on the outer side of the corona discharge device in a surrounding mode, and a wear-resistant lining is arranged on the inner wall of the concentrated pulverized coal pipeline. The device is mainly used for improving the pulverized coal concentration of the pulverized coal boiler during low-load operation.

The invention discloses a device for exciting ion sound waves for noise reduction, and belongs to the technical field of vibration reduction and noise reduction. The device comprises a cathode structure, an anode structure, a noise source, a square pipeline and a high-voltage power supply device, the frequency, phase and amplitude characteristics of the ion sound wave are directly modulated through the preset combination of applied voltage, electrode gap and discharge position parameters; the cathode structure and the anode structure are composed of three kinds of electrodes, namely a cathode of a needle electrode structure, an anode of a metal wire structure and a perforated plate-shaped grounding electrode. The high-voltage power supply device is used for applying negative high voltage to the needle electrode and grounding the perforated plate, or applying positive high voltage to the metal wire electrode and grounding the cathode so as to generate corona discharge; and ion sound waves generated by corona discharge and industrial noise emitted by the noise source are subjected to sound wave superposition in the square pipeline so as to realize sound pressure counteracting. Ion sound waves are directly generated through corona discharge and are superposed and counteracted with noise sound waves, and passive noise reduction is achieved.

The application relates to the field of material polarization, and relates to a composite polarization device and a polarization method of a composite piezoelectric material. The device comprises an insulating container, a negative electrode plate, a flexible insulating cover, an insulating liquid and a positive electrode needle. The flexible insulating cover is arranged on the negative electrode plate, the insulating liquid is used for filling in the insulating container, and the positive electrode needle is arranged above an open cavity of the insulating container and used for generating corona to a sample to be polarized. The device combines the advantages of two polarization methods of a direct-current oil bath polarization method and a corona polarization method. The insulating liquid is filled in the insulating container, the small gap between the insulating container and the flexible insulating cover and the complex hollow structure inside the sample to be polarized can be filled, so that the breakdown of any weak point in the polarization process can be prevented. The composite piezoelectric material is polarized by using the composite polarization device, and the polarization voltage can be improved under the condition that the corona discharge is stable and normal.

The invention discloses a cooling tower fog drop trapping device and method based on corona discharge, belongs to the field of manufacturing and application of electric trapping devices, and aims to achieve the purposes of efficiently trapping fog drops and recycling water mist of a cooling tower of a thermal power plant in an energy-saving manner, an insulating shell is formed into a cavity with a narrow upper part and a wide lower part, and an opening of the cavity is formed in an upper shell; the trapping net is arranged in the cavity close to the opening; the atomizing device is arranged at the lower part in the cavity to form mist; the needle electrode is arranged in the cavity between the trapping net and the atomization device; and the water storage area is arranged at the bottom of the cavity, so that the fogdrop trapping area of the trapping net is increased, and the trapping efficiency is improved.

The invention discloses a corona discharge stability control method, device and equipment for aerosol concentration detection and a medium. A ring electrode comprising a first cavity and a second cavity which are coaxially and sequentially arranged is arranged, a corona pin is coaxially located in the first cavity, and a pin tip is located close to the second cavity; a control chip is adopted to convert a low-voltage direct-current power supply signal into a high voltage of 2kV + / -5% through PWM signal control, and the high voltage is applied between the corona pin and the ring electrode; and comprehensively performing compensation control on the discharge current of the corona pin to obtain a first compensation control quantity and performing compensation control on the environmental parameters to obtain a second compensation control quantity to obtain a total compensation control quantity, and adjusting the duty ratio of the PWM signal of the control chip through the total control quantity. According to the embodiment of the invention, the current stability is high, the environmental adaptability is good, the discharge voltage is low, and the service life of the corona pin is long.

A method of fabricating a high-temperature bobbin for a solenoid or other electrical assembly includes the step of providing a bobbin configured for use in the assembly. The bobbin is coated with an anti-oxidation composition and an anti-corrosion composition to produce an oxidation / corrosion resistant bobbin. The oxidation / corrosion resistant bobbin is coated with an electrical insulating composition that is resistant to corona discharge at or below a predetermined voltage threshold to produce an insulated and oxidation / corrosion resistant bobbin. The anti-oxidation composition, the anti-corrosion composition, and the electrical insulating composition can withstand temperatures of subzero up to temperature greater than 1000° F.

The invention discloses an insulation defect detection method based on a quantum color center technology, and belongs to the field of state monitoring. Comprising the steps that a quantum sensing module and an excitation and signal acquisition module are adopted to detect the insulation defect of the electrical equipment, the quantum sensing module adopts a silicon carbide color center chip, a double-vacancy defect is prepared through an ion implantation and annealing process, a substrate material adopts AlN ceramic, and a protective layer adopts an aerogel composite structure; a DPSS laser is adopted as a light source of a laser excitation chain of an excitation and signal acquisition module, and a single-photon avalanche diode array is adopted as a detector of a fluorescence acquisition chain; a signal processing flow is based on silicon carbide double-vacancy color center fluorescence lifetime attenuation characteristics, partial discharge detection is carried out, dynamic change and frequency spectrum characteristics of a color center fluorescence lifetime tau value are analyzed, a multi-physics field decoupling algorithm combining time domain fluorescence lifetime analysis, frequency domain vibration spectrum extraction and a machine learning classification model is adopted, and a silicon carbide double-vacancy color center fluorescence lifetime tau value is analyzed. And high-precision identification and positioning of discharge types such as corona discharge and creeping discharge are realized.

The invention provides a Kelvin drip generator corona discharge enhancement-based friction nanometer generator and a preparation method thereof. Wherein the generator comprises a Kelvin water dripping machine, high voltages at two ends of the Kelvin water dripping machine are respectively coupled to a back gate electrode and a suspension needle, a non-uniform electric field is constructed in a needle tip-FEP area, corona discharge is triggered, charges are directionally injected into an FEP / liquid drop system, and the FEP / liquid drop system is charged. The injected charges are connected in parallel into the device through a multi-branch capacitor network formed by the back gate electrode, the upper electrode / the lower electrode and the FEP. According to the invention, through cooperation of exogenous pumping and liquid drop charge shuttling (DSG), single-drop transfer charge and open-circuit voltage are significantly improved, and direct-current stepped accumulative output is maintained.

Various approaches can be used to interrogate a surface such as a surface of a layered semiconductor structure on a semiconductor wafer. Certain approaches employ Second Harmonic Generation while other utilize four wave-mixing or multi-wave mixing. Corona discharge may be applied to the sample to provide additional information. Some approaches involve determining current flow from a sample illuminated with radiation.

This invention discloses a system and method for locating corona discharge in generator stator windings. The system includes a track, two symmetrical supports, and a controller. The supports are I-shaped with adjustable support rod height. A movable crossarm slider is mounted on the crossarm rod, with both ends fixed to the crossarm slider. A track slider is fitted onto the track, enabling circumferential rotation and axial stepping movement. A laser mapping and modeling device and a corona discharge detection device are fixed opposite to each other on the track slider. The method includes: system layout; track center calibration; laser mapping and modeling to establish a cylindrical coordinate system; background noise detection; abnormal discharge detection under rated voltage; and data comparison to screen for true discharge points. This invention achieves blind-spot-free detection throughout the entire stator winding. By establishing a dedicated coordinate system through laser mapping and modeling, combined with ultraviolet and acoustic fingerprint detection methods and background noise comparison, it achieves precise coordinate positioning of corona discharge points, adapting to different generator models and automating operation.

The invention discloses a corona discharge ion mobility spectrometer, which relates to the technical field of analytical chemistry instruments and comprises a corona discharge assembly, a reverse field ion gate structure, an ion migration assembly, a sample gas inlet, a shielding grid mesh and a Faraday detection plate. The corona discharge assembly comprises a corona discharge needle and at least three ion reaction area electrode rings which are sequentially distributed at intervals. The reverse field ion gate structure comprises a first grid mesh, a second grid mesh and a third grid mesh which are distributed at intervals in the axial direction and can be connected with different voltages, and the reaction area is located between the first grid mesh and the second grid mesh. The ion migration assembly comprises a plurality of ion migration region electrode rings which are coaxially arranged. The electric field is improved through the arrangement of the grid meshes, the area between the first grid mesh and the second grid mesh of the reverse field ion gate serves as the reaction area, the original reaction area is removed, miniaturization of the drift tube is facilitated, and meanwhile the sensitivity and the resolution ratio under a complex matrix are improved.

The invention discloses a low-cost handheld portable photoacoustic electromagnetic wave multi-mode insulator detection device, and relates to the technical field of electrical equipment detection, an optical detection module is used for comprehensively collecting appearance images, thermal radiation data and deep ultraviolet signals of an insulator, and the defects of appearance damage, heating, corona discharge and the like of the insulator are accurately recognized; the acoustic detection module collects abnormal sound wave signals of the insulator and achieves accurate sound source positioning by means of an 8-array-element far-field microphone array and a sound source positioning signal processing system. The electromagnetic wave detection module collects a radio frequency signal of the insulator through a radio frequency antenna and a radio frequency spectrum analysis system, carries out deep spectrum analysis and rapidly judges a discharge fault of the insulator, and the central controller is responsible for carrying out synchronous collection, preprocessing and fusion analysis on multi-modal data, generates fault early warning information and carries out on-site processing prompt, and carries out real-time monitoring on the discharge fault of the insulator. Problems existing in existing insulator detection equipment can be effectively solved, and a powerful guarantee is provided for safe and stable operation of a power system.

The application relates to a method for determining the electrode spacing of an ion generating device, belonging to the field of corona discharge devices. The method comprises the following steps: discharging test is carried out on a simulated device of de-energizing / energizing under different electrode spacings between two adjacent electrodes, the maximum value I of the discharge current received by an oscilloscope within a time T (s) is measured, the current value per unit length is calculated, the maximum current density received under various discharge electrode spacings is calculated, and the electrode spacing D corresponding to the maximum value is taken as the optimal electrode spacing. The method uses the parameter of the maximum current density to determine the optimal discharge electrode spacing between the two adjacent electrodes, so as to increase the ion quantity generated by the ion generating device under the same voltage, and the de-energizing / energizing rod releases the most ions within the length range, and the discharge efficiency is maximized. The method can be widely used in the design and manufacturing field of various specifications of de-energizing / energizing rods.

The present disclosure provides an air disinfection apparatus for use with an air conditioning system configured to create an airflow. The air disinfection apparatus comprises a hollow housing for conveying said airflow therethrough between an air inlet and an opposite air outlet determining an airflow direction; a screen forming a non-ionizing electrode extending along a screen longitudinal extension axis, said non-ionizing electrode being mounted in the housing between the air inlet and the air outlet so that a screen surface is tangential to the airflow direction; a wire forming an ionizing electrode, said wire being suspended in said hollow housing between the air inlet and the air outlet and having a wire axis aligned with the screen longitudinal extension axis so as to face said screen surface; terminals electrically connected to the wire and screen for coupling thereto high and low voltage outputs of a high voltage generator of sufficient voltage to create a corona discharge zone across the airflow between the wire and the screen; wherein the screen includes an ion receiver positioned downstream of the corona discharge zone relative to the airflow direction, said ion receiver being dimensioned to cause ions produced in the corona discharge zone to be attracted so as to prevent release of ions outside of the air disinfection apparatus.

A static synchronous series compensation system and method, the scheme includes: a primary circuit installed on a high potential platform and a secondary circuit installed in a control protection room; the high potential platform is connected with a power transmission line at the same potential; the primary circuit is connected in series with the power transmission line to compensate the voltage of the power transmission line; the secondary circuit is connected with the primary circuit, and compensation instructions are issued to the primary circuit according to the voltage loss value of the power transmission line. The static synchronous series compensation system in the scheme does not need a series transformer or only needs a low insulation grade series transformer, greatly reduces the insulation design difficulty of the series transformer, reduces the device cost, reduces the equipment weight, reduces the equipment cost, and greatly reduces the occupied area. In the scheme, the high potential platform is connected with the power transmission line at the same potential, and the primary circuit is installed on the high potential platform, which reduces the energy loss of the primary circuit caused by corona discharge and the electromagnetic interference of the adjacent equipment.

The utility model relates to electronic components technical field especially relates to a choke coil inductor, the utility model discloses the protrusion that extends along the radial is arranged at two corners of base body, the threading hole along the axial is seted up on the protrusion, and the both ends of coil extend to two protrusions along the radial respectively, and the one end of two electronic wires respectively passes threading hole and is electrically connected with the both ends of coil, and such design can increase the distance between the two lead ends of coil, and the insulation performance and reliability of inductor are improved significantly, and the corona discharge problem under high pressure environment is avoided.

To provide an electret apparatus that enables formation, within a short time, of an electret having uniformly mixed regions processed to positive and negative polarities, and that allows achievement of high collection efficiency of a nonwoven fabric.SOLUTION: An electret apparatus comprising a grounding electrode 2 and an applying electrode 3 that directly clamp a nonwoven fabric s to be processed, wherein the applying electrode 3 is in a roller shape composed of a metallic core member 3a to which a negative voltage is applied from a direct current power supply 4, and a resistor layer 3b provided on a surface of the core member 3a, such that corona discharge is generated from the applying electrode 3 and induced discharge is generated from the grounding electrode 2.SELECTED DRAWING: Figure 1

The present application relates to a kind of superimposed detection method and electronic equipment for high-voltage electrical equipment surface corona discharge, three superimposed sounder devices are placed on the lateral three sides of high-voltage electrical equipment, and the superimposed audio signal data is received by partial discharge detector on the lateral fourth side, the method comprises: measuring the surface corona discharge signal Max n1 of high-voltage electrical equipment;In turn open each superimposed sounder device, emit 1K~20KHz sound wave, measure the three full-frequency superimposed audio signals corresponding to phase A, respectively: ∑n,1, ∑n,2 and ∑n,3;Determine whether full-frequency superimposed audio signal is greater than Max n1, if yes, surface corona discharge occurs, and the site of surface corona discharge is positioned, otherwise, surface corona discharge does not occur;Repeat the above steps, detect and position phase B and phase C.Compared with prior art, the present application has the advantages of being able to detect surface corona discharge in time and acutely, and positioning the site of surface corona discharge, as well as predicting the degree of insulation deterioration.

This invention provides a measurement method and apparatus that can reduce the cost of developing equipment for measuring the number concentration of fine particles using the diffusion charging method. [Solution] The method for measuring the number concentration of particulate matter involves measuring the number concentration of particulate matter in a gas by the diffusion charging method. The method for measuring the number concentration of particulate matter involves alternately introducing the gas containing particulate matter, which has been ionized by corona discharge and onto which generated ions adhere to the particulate matter, and the air that has passed through the filter 6 into the Faraday cage 11, and measuring the induced current generated to determine the number concentration.

The utility model provides a kind of front electrode group and gas particle purification machine, the front electrode group includes at least one discharge beam connected with direct current power supply, the discharge beam includes multiple metal wires and / or conductive non-metal wire.Discharge beam includes more than 0.1 million metal wires and / or conductive non-metal wire;The metal wire includes at least one of stainless steel fiber, titanium chromium aluminum alloy wire, titanium alloy wire, nickel alloy wire.The front electrode group of the utility model is similar to brush shape in discharge beam, uses corona discharge, and the tip of each fiber wire of free end is discharge point, significantly improves discharge effect, and the charging efficiency of particulate matter in gas is improved, and effectively reduce to almost not produce ozone.

The application discloses a corona discharge load state detection method based on an oscillation circuit voltage ratio relationship and relates to the technical field of corona discharge detection. An ideal Royer circuit is constructed; a peak value protection circuit is used for collecting a peak voltage Vm; a direct current input voltage of a sine wave self-excitation oscillation boost circuit is Vin; a ratio relationship of Vm and Vin in the ideal Royer circuit under no-load is calculated to obtain a first relationship formula; a ratio relationship of Vm and Vin in the ideal Royer circuit under load is calculated to obtain a second relationship formula; first-order linear approximation fitting is performed on the first relationship formula and the second relationship formula to obtain a target relationship formula; and the corona discharge load state is determined according to the target relationship formula. Through establishing a quantitative relationship between the ratio of the peak voltage of the primary side of the Royer circuit which is easy to measure and the input voltage and the secondary direct current high voltage and the load current reflecting the needle tip state, safe, quantitative and adaptive contamination detection is realized.