151results about "Testing vessel construction" patented technology

The invention relates to an unmanned aerial vehicle zero-value insulator live detection device and method, an execution module comprises an AI image recognition unit and a detection probe, the detection probe integrates a voltage sensor and a resistance sensor and supports two modes of live resistance detection and distributed voltage detection, the AI image recognition unit is adjacent to the root of the detection probe, and the AI image recognition unit is adjacent to the root of the detection probe. The image acquisition module is used for acquiring insulator steel cap images and outputting positioning signals; the controller mainboard is electrically connected with the detection probe, the rotating mechanism and the AI image recognition unit through shielding cables, and the controller mainboard is used for receiving a positioning signal of the AI image recognition unit, receiving voltage detection data and / or current detection data transmitted by the detection probe, processing the detection data and obtaining a detection result of the state of the insulator. According to the invention, a dual-mode cooperation mechanism of'distributed voltage preliminary screening + charged resistance verification 'is adopted, and AI automatic positioning and mode automatic switching functions are combined, so that the detection efficiency is remarkably improved.

The invention discloses a terahertz reflectance spectrum-based insulating oil micro-water content and aging detection method, device and equipment and a storage medium, and relates to the technical field of dielectric spectroscopy, and the method comprises the following steps: sampling each standard sample to obtain a to-be-detected sample, placing each to-be-detected sample in a sample bearing vessel to obtain an oil film layer, reflecting terahertz wave beams are utilized to irradiate each oil film layer to obtain a terahertz amplitude spectrum and a terahertz phase spectrum, a target three-layer optical model is utilized to perform inversion to obtain a complex dielectric function frequency spectrum, and a preset sub-dielectric model is utilized to fit the complex dielectric function frequency spectrum to obtain a main resonance characteristic and a characteristic parameter set; determining a reference micro-water content based on the main resonance characteristics, determining training data based on the characteristic parameter set, and constructing a target multi-task regression model; and processing the characteristic parameter set by using the model to obtain an initial prediction result and a confidence interval, verifying the prediction result to obtain a target prediction result, and improving the efficiency of detecting the micro-water content and aging of the insulating oil.

The invention discloses a portable lightning arrester performance detection device and a use method thereof, and relates to the field of lightning arrester detection. The portable lightning arrester performance detection device comprises a direct-current high-voltage generator and a box cover arranged on the direct-current high-voltage generator, a flat cable is arranged between the direct-current high-voltage generator and the box cover, two test main lines are embedded in the flat cable, a placement cavity is formed in the box cover, and the test main lines are arranged in the placement cavity. And a plurality of contact type power connection seats are arranged in the placement cavity in parallel based on the test main line, and each contact type power connection seat can be used for placing the lightning arrester main body and is electrically connected with the lightning arrester main body in a contact manner. According to the portable lightning arrester performance detection device, the multi-station parallel contact type power connection seat is arranged in the placement cavity of the box cover, the test branch line is connected with the test main line, a plurality of lightning arrester main bodies can be placed at the same time, a single detection loop is independently controlled through the change-over switch, and batch detection and station switching are achieved.

A method for detecting a partial discharge in electric power equipment is disclosed. Two or more narrowband signals corresponding to respective frequency bands of the partial discharge are obtained by two or more receivers, and a temporal coincidence of the two or more narrowband signals is detected, thereby indicating a possible presence of the partial discharge. Then a synchronous recurrence of the partial discharge over a plurality of power cycles is determined, thereby validating the possible presence of the partial discharge. A corresponding system is also provided.

This utility model provides a transformer partial discharge testing device, mainly relating to the field of transformer technology. The device includes a housing and metal electrodes. The metal electrodes are slidably disposed on the top of the housing. A rectangular cylinder is fixedly disposed on the top of the housing. A support frame is slidably disposed inside the rectangular cylinder. A limiting block is hinged to the outside of the rectangular cylinder, and the limiting block abuts against the side of the support frame. An L-shaped fixing plate is fixedly disposed on the outside of the rectangular cylinder, and a DC solenoid valve is fixedly disposed on the L-shaped fixing plate. The end of the DC solenoid valve abuts against the limiting block. The advantages of this utility model are: after the test is completed or the monitoring system detects an abnormality, the metal electrodes can be quickly and safely separated from the transformer, effectively avoiding the risk of electric shock due to residual charge and greatly ensuring the safety of operators.

The invention discloses a frequency converter anti-breakdown capability testing device, and belongs to the technical field of frequency converter testing devices. Comprising a rack, and a fixing frame is fixedly installed on the rack; the material table is rotationally mounted on the rack, and a placing groove for placing the frequency converter is formed in the material table; the testing arm is installed on the fixing frame in a lifting mode and provides rotation of the material table to enable the containing groove to be located on the lower side of the testing arm; the monitoring block is fixedly mounted on the testing arm, and an electrode column is arranged on the monitoring block; a fixed cylinder is fixedly installed on the monitoring block, and the upper end of the electrode column is slidably arranged in the fixed cylinder. The frequency converter anti-breakdown capability testing device provided by the invention has the beneficial effects that through the arrangement of the electrode column and the fixed cylinder, the lower end of the electrode column is in contact with the power connection terminal and slides in the fixed cylinder, so that gas in the fixed cylinder is discharged into the connecting cylinder, and the connecting spring is compressed; at the moment, pre-tightening force exists between the lower end of the electrode column and the power connection terminal.

The invention belongs to the technical field of anti-lightning performance evaluation, and particularly relates to a method for evaluating the anti-lightning performance of large equipment, which comprises the following steps of: designing, processing and manufacturing a scaling part for the to-be-evaluated large equipment, and establishing equivalent mapping between the scaling part and an ideal rod-plate reference configuration; constructing a test environment; fixing the scaled part according to a service typical attitude, setting an equivalent gap between the scaled part and the counter electrode based on equivalent mapping, and dividing an attachment evaluation area number; setting impulse voltage, and configuring a measuring system: respectively carrying out lightning impulse tests in three types of environments; calculating evaluation indexes based on the test result, wherein the evaluation indexes comprise a first compression resistance coefficient and a second compression resistance coefficient; and based on the calculated evaluation indexes, obtaining a comprehensive evaluation value, and forming an evaluation conclusion. According to the invention, the problem of the real-size lightning stroke test of large equipment is solved, a unified, comparable and traceable lightning stroke resistance evaluation system is established, and a basis can be provided for structure optimization and protection design.

The invention discloses an electrode device and method for measuring space charges through pressure-electric field-temperature coupling, and the device comprises an upper electrode structure which comprises an upper connecting plate, a conductive bolt, cylindrical ceramic, and an upper electrode terminal; the bottom of the conductive bolt is fixedly connected with the upper connecting plate, and the top of the conductive bolt is provided with radial scales and can be in contact with a fixed surface of an external calibration platform through thread feeding; the lower electrode structure comprises a lower connecting plate, plate-shaped ceramic and a lower electrode terminal; the lower electrode terminal comprises a heating resistance wire; two ends of the high-voltage pulse unit are respectively connected to the upper and lower electrode terminals; the signal collecting and converting unit is connected with the lower electrode terminal; a to-be-tested sample is clamped between the cylindrical ceramic and the plate-shaped ceramic; the upper and lower connecting plates apply stress to a to-be-tested sample through engagement of connecting bolts; and a pressure sensor is arranged between each connecting bolt and the upper connecting plate. The device has the functions of pressure regulation and control and real-time measurement of the thickness of the sample, and can more accurately measure the space charge in the insulating material of the cable accessory.

The invention discloses a device for avoiding electrode air discharge in DBC lining plate insulation characteristic detection. The device comprises a quartz glass cavity, a PPA insulation top cover, an electrode column, a copper bottom plate and a PEEK fixing bolt. The quartz glass cavity comprises a cavity main body and observation windows, the cavity main body is of a hollow shell structure, and the observation windows are holes formed in the four side walls of the cavity; the PPA insulating top cover is provided with an insulating baffle and an electrode column mounting hole, so that the testing cavity can test a plurality of DBC lining plates at multiple intervals, air discharge among the electrode columns is avoided, one end of each electrode column extends into the cavity main body, the other end of each electrode column is provided with a thread, and the electrode columns can penetrate through the electrode column mounting holes to be locked and fixed. The vertical distance between the bottom of the electrode column and the copper bottom plate can be adjusted by rotating the electrode column outside, so that DBC lining plates with different thicknesses can be tested; the four PEEK fixing bolts respectively penetrate through the PEEK fixing bolt mounting holes in the top corners of the PPA insulating top cover and are tightly connected with the PEEK fixing bolt mounting holes in the copper bottom plate, so that the quartz glass cavity is tightly fixed by the PPA insulating top cover and the copper bottom plate, and the device is widely applied to the fields of high-pressure and high-temperature insulation characteristic detection of various DBC lining plates and the like.

The invention discloses a device and method for testing the voltage breakdown performance of a cable in a high-temperature environment, and belongs to the technical field of electrical insulation, the device comprises an insulation bin, the two sides of the insulation bin are fixedly connected with an access bin and an outlet bin respectively, connecting holes are formed in the connecting positions of the access bin and the insulation bin and the connecting positions of the outlet bin and the insulation bin, and the connecting holes are communicated with the insulation bin. An insulating base is arranged at the bottom in the insulating bin, two grooves are formed in the upper surface of the insulating base, a supporting bracket is clamped in each groove, the upper parts of the supporting brackets are in contact with a cable to be tested, a conductive mechanism is arranged on the front side of the insulating base, and the conductive mechanism is connected with the insulating base. According to the test equipment, the voltage breakdown phenomenon of the cable under the real use condition can be simulated, the obtained test data is closer to the real use condition, and the electrical strength performance of the cable insulation material can be better evaluated.

Occurrence of partial discharge is reduce and the test of electrical properties of a semiconductor device is and stably performed. A semiconductor testing apparatus includes a stage, a probe, a separation section, and a gas supply section. The probe performs electrical input and output to and from the semiconductor device held on the stage. The separation section separates the space above the semiconductor device held on the stage into the pressurized space and the probe space including the probe. The gas supply section supplies gas to the pressurized space to pressurize the pressurized space.

This disclosure relates to the field of insulating material testing, including a method and system for evaluating the nonlinear strength of insulating materials based on high-frequency component analysis. The method involves applying an excitation electrical signal of a first preset frequency to the insulating material under test; acquiring the response signal obtained by the insulating material in response to the excitation electrical signal based on a second preset frequency; performing time-frequency transformation on the response signal to obtain the frequency characteristics of various preset higher harmonic components; and determining the evaluation result of the nonlinear strength of the insulating material based on the frequency characteristics of these higher harmonic components. This method allows for obtaining the evaluation result of the nonlinear strength with a single excitation and response acquisition; it eliminates the need for multi-voltage point step testing in traditional techniques, shortening the testing cycle, improving testing efficiency, and enabling efficient, accurate, and standardized determination of the nonlinear strength evaluation result.

The utility model provides a high-voltage switch cabinet discharge gas diffusion simulation device, which relates to the technical field of gas diffusion simulation, and comprises a box body, a simulation cabin is arranged in the box body close to the bottom, a gas environment detection equipment main body is arranged in the box body close to the top end, and a gas environment detection equipment main body is arranged in the box body close to the left side. A built-in groove is formed in the bottom of the simulation bin, a discharging pipeline communicated with the built-in groove is arranged at the bottom of the left side of the box body, and an opening and closing assembly is installed in the built-in groove to control the gas release rate. Through the air pressure sensor and the temperature sensor, the temperature and gas pressure change in the simulation bin in the simulation process can be monitored, the point discharge model, the suspension discharge model and the air gap discharge model are used in cooperation, collection of simulation data can be expanded, the gas diffusion simulation precision is greatly improved, and the simulation efficiency is improved. And certain help is provided for insulation defect diagnosis and structure optimization of the high-voltage switch cabinet.

A sensor device for monitoring dielectric strength of a dielectric fluid has a sensor body which supports a sensitive part (SGi), designed for contact with the dielectric fluid. The sensitive part (SGi) comprises at least one pair of electrodes (E1, E2) having respective surface portions arranged at a predefined micrometric or sub-micrometric distance, to define therebetween at least one detection gap between which part of the dielectric fluid is suitable to seep in. The sensor device has a circuit arrangement comprising: —means for generating an electric field between the two electrodes of the at least one pair of electrodes (E1, E2) starting from a known supply voltage, and—means (V) for measuring a voltage representative of possible occurrence of an electric discharge between the two electrodes of the at least one pair of electrodes (E1, E2) through the dielectric fluid (5) present in the at least one detection gap (G), following generation of the electric field.

The embodiment of the invention discloses a multi-band ultrahigh frequency detection device, a multi-band ultrahigh frequency detection method and a computer readable storage medium. The multi-band ultrahigh frequency detection device comprises an ultrahigh frequency sensor, a front-end processing module and an acquisition module. The ultrahigh frequency sensor is used for collecting an electric signal sent by a measured object. The front-end processing module comprises a band-pass filter circuit and a detection filter circuit, and the band-pass filter circuit is used for separating the electric signal into multiple sub-band signals of different wavebands; the detection filter circuit is used for collecting effective content in each sub-band signal to obtain a detection signal. And the acquisition module is used for converting the multiple paths of detection signals into ultrahigh-frequency acquisition information and uploading the ultrahigh-frequency acquisition information, and the ultrahigh-frequency acquisition information is used for representing the working condition state of the detected object. Therefore, the ultrahigh frequency acquisition information under different frequency bands can be effectively acquired, and synchronous acquisition of the ultrahigh frequency acquisition information of multiple independent frequency bands can be realized.

Method and system for identifying sources of partial discharge (PD), from a set of potential sources, in an alternating current three-phase high-voltage power-distribution system are disclosed. A timing signal is generated, phase-locked to a selected phase of three phases of the power-distribution system, having a measurable phase displacement from the selected phase. A cyclical timer is generated for indicating time within a power cycle based on a master clock phase-locked to the timing signal. A power-cycle period is partitioned into a number of dual observation windows, each dual observation window corresponding to a potential source and having two individual windows, π-radians apart, and a specified window width. From a PD-detection apparatus, using the timing signal and the timer, magnitudes and time instants of PD detection during successive power cycles are received. PD detection is associated with respective dual observation windows, hence respective PD sources based, on the time instants.

The invention belongs to the technical field of material testing, and discloses an insulating silica gel detection device, which comprises a host cabinet body and a transparent cover plate arranged above the host cabinet body, the detection device further comprises a transparent sleeve, a fixed electrode, a connecting electrode, a ceramic placement box and a safety protection assembly; the transparent sleeve is arranged in the host cabinet body and is positioned below the transparent cover plate; the fixed electrode is fixedly arranged in the transparent sleeve; the connecting electrode is arranged on the fixed electrode; the ceramic placement box is arranged between the two connecting electrodes, a hole is formed in the ceramic placement box, and under the action of the safety protection assembly, original dangerous operation with high-voltage shock and electric arc damage risks is converted into a safe, stable, automatic and reliable standardized process; therefore, the personal safety and the equipment safety are greatly guaranteed, and the quality and the credibility of the detection data are fundamentally improved.

The invention relates to an insulating glove assembly line full-automatic test method and system, and relates to the field of industrial automation, and the method comprises the steps: collecting detection image information; glove features are scanned and recognized from the detection image information to obtain a current glove model; determining an internal electrode specification and a set of test parameters in response to the current glove model; based on the specifications of the internal electrodes, the manipulator is controlled to sleeve the glove to be detected on the corresponding internal electrodes, the sealing mechanism is controlled to seal the opening of the glove so as to form a closed cavity in the glove, and then sealing detection is performed by an inflation detection method; when the sealing detection result is a qualified detection result, the fluid replacement unit is controlled to execute medium replacement from inside to outside according to the test parameter set, and gas during sealing detection is replaced with electrode liquid; and controlling the insulation detection device to perform an electrical insulation performance test on the glove according to the test parameter set so as to complete insulation detection of the glove. The method has the effect of improving the accuracy of the high-voltage insulation test.

The invention belongs to the technical field of arc fault detection, and relates to a photovoltaic energy storage inverter arc fault detection device which comprises a detection box, two protection grooves are symmetrically formed in the side face of the detection box, and a cover plate is rotationally arranged at the position, located at the end of each protection groove, of one side of the detection box. Piston plates are horizontally and slidably connected into the two protection grooves in a sealed mode, probes are fixedly installed in the middles of the sides, close to the cover plates, of the piston plates, a connecting piece is arranged between each piston plate and the corresponding cover plate, and an air inlet is formed in the top face of the end, away from the corresponding cover plate, of each protection groove; each piston plate is provided with a plurality of inclined air blowing ports, and the end of each air blowing port faces the probe. The device has the advantages that when the electric push rod is used for pushing the probe to move towards the outside of the protection groove, the connecting rod can push the cover plate to rotate upwards, so that the probe is moved out from the lower part of the cover plate, the cover plate is automatically opened when the probe is moved, separate driving is not needed, and the device is more convenient to use.

The application discloses a kind of concentrator pressure-withstanding verification device, belong to concentrator verification technical field, to solve in the process of pressure-withstanding verification to concentrator, when early insulation hidden danger such as micro flashover, local weak discharge occurs in concentrator insulation part, it is not easy to be captured in time by traditional monitoring module, and then cause potential insulation defect missed detection problem, application includes pressure-withstanding detection table, two two-way gas path components are installed in pressure-withstanding detection table side, a plurality of support components are arranged in pressure-withstanding detection table, concentrator main body is arranged in support component, terminal row is fixedly connected at the bottom of concentrator main body, two groups of sealing components are arranged in pressure-withstanding detection table, the gas in sealing cavity can be driven directional closed loop circulation by the application, ozone generated by weak discharge is transported to detection site quickly, concentration change is captured accurately, field electromagnetic interference is avoided, the detection sensitivity of micro flashover and early weak discharge is improved, and the missing rate of misjudgment is reduced.

A device for acoustic detection of an electric arc, including a tubular probe suitable for being arranged next to a piece of electrical equipment on which an electric arc is likely to form. An interior space, circumscribed by a wall of the probe, extends along the length of the probe. This interior space is filled with a fluid and acoustically isolated from external noise by the wall. The probe includes, at the periphery of its interior space, on its wall, at least one vulnerable zone suitable for degrading under the effect of the electric arc, revealing a passage to the interior space for an acoustic wave generated by the electric arc. The device further includes at least one acoustic sensor suitable for detecting the acoustic wave that travelled through the passage and propagated in the interior space of the probe.

The invention discloses a device and method for testing charge distribution and GIL insulator surface flashover characteristics, and the device comprises a closed experiment cavity, an insulator rotating table is disposed in the middle of the interior of the closed experiment cavity, and the insulator rotating table is connected with a rotation control system and controls the vertical movement and rotation movement of the insulator rotating table. The top of the insulator rotating table is provided with a top clamp used for clamping an insulator, the corona pin is fixed to the upper portion in the closed experiment cavity through a three-dimensional fine adjustment support and connected with an external high-voltage power source through a high-voltage terminal, the probe is installed on the inner side of the cavity through a fixed rotating device, and the measuring face of the probe faces the surface of the insulator. The probe is used for scanning and detecting surface potential distribution, and a probe signal is led to the electrostatic potentiometer through a shielding cable and is recorded and processed in real time through an oscilloscope and a data acquisition system. A real electric field environment of a direct current GIL coaxial cylinder structure can be simulated to measure complex curved surface charge distribution, and a mapping model of a charge accumulation state and a surface flashover characteristic is established.

An apparatus and method for identifying liner holidays, with a generator having two contacts with a liner and pulsing current to a moving one of the contacts. A plurality of detected electric signals are processed to continuously generate a baseline indicative of a holiday. A holiday signal is actuated when a signal is detected which when compared to the generated baseline indicates a holiday. A plurality of electric signal types and baselines, such as current strength and voltage, may be separately detected with a holiday signal actuated when either signal type is detected which when compared to its generated baseline indicates a holiday. The moving contact may be flexible to conform to contour of the liner.

The invention provides an overall electricity resistance test electrode device for insulation protective clothing and a test method thereof, and relates to the technical field of test. The bearing base is a bearing base of the whole electricity resistance test electrode device for the insulation protective clothing, and the top is provided with an insulation positioning seat. And the clothes hanger type composite electrode assembly is fixed on the bearing base through the insulating positioning seat. And the flexible grounding electrode layer is attached to the outer surface of the insulating protective clothing. Through the combined electrode structure, the arc-shaped chamfer design and the adjustable mechanism, the overall accurate test of the insulating protective clothing, especially the insulating protective clothing including the connecting section, is realized. The non-dead-corner coverage of the key connection section is realized, the problem that the connection section defect is missed in the traditional plate electrode is solved, and the test integrity is obviously improved. The sliding flash discharge interference is effectively inhibited, the sliding flash misjudgment rate is reduced to 0.5% or below, and the test precision is greatly improved. The adaptive range covers the specifications of existing mainstream protective clothing, the adaptability and the test efficiency are well optimized, and the structural stability is excellent.

The present disclosure provides an insulation withstand voltage detection method and detection device for a wiring harness, and an automobile wiring harness assembly line. The insulation withstand voltage detection method for the wiring harness includes: step S 10: placing a to-be-detected wiring harness in an enclosed cavity, in which a conductive electrode plate is disposed in the enclosed cavity, and the to-be-detected wiring harness has one end insulated and enclosed, and the other end connected to a power supply; step S20: reducing air pressure in the enclosed cavity; step S30: providing a test voltage by the power supply; and step S40: detecting a voltage of the to-be-detected wiring harness, and / or detecting a leakage current of the to-be-detected wiring harness. Through the present disclosure, it alleviates the technical problem in the prior art that the dielectric insulation detection of a high-voltage wiring harness cannot realize the in-line detection of finished products.

The invention discloses a test device and a measurement method for measuring the arc characteristic of a transformer oil-less bushing, and relates to the technical field of arc characteristic measurement. By arranging a test cavity for simulating a real transformer oil-less bushing and cooperating with an electrode unit, the arc discharge environment of a narrow space in the oil-less bushing can be restored more truly; meanwhile, the multi-parameter detection unit is arranged, signals of the multi-parameter detection unit are converged into the same data acquisition device, the problem that in the prior art, electric parameters and non-electric parameters of an electric arc are difficult to measure synchronously is effectively solved, and a reliable experimental platform is provided for deeply researching the characteristics of the electric arc and revealing the internal incidence relation among the parameters; two methods of direct measurement and calculation measurement are adopted for the gas production rate, the accuracy of measurement data can be verified, and system errors possibly existing in a single measurement method are eliminated, so that more reliable and accurate gas production rate data are obtained, and the credibility of an experimental result is remarkably improved.

The present application belongs to the field of insulation test, and relates to a plant oil paper composite insulation electrical performance test device and method. The test device comprises an upper section test oil tank and a lower section oil storage oil tank. A support frame is fixedly installed inside the upper section test oil tank, and an electrode device is fixedly installed on the support frame. The electrode device comprises a windowed insulation paper board, two voltage grading rings and an electrode. The electrode is a copper conductor with insulation, which is bent into a T-shaped hanger shape. The test method comprises the following steps: press the plant insulation liquid dielectric from the lower section oil storage oil tank into the upper section test oil tank through a connecting pipe until the electrode device is covered; simulate the change of the electrode gap, i.e. the oil gap, by adjusting the distance between the long oval circles of the electrode; simulate the change of the turn insulation specification by changing the thickness of the insulation paper of the electrode; and realize the test under different operating conditions. The test device is convenient to disassemble and oil injection, strictly controls a single variable, and reduces the influence of the oxidation degree of the insulation oil and impurities on the test.

The invention relates to the technical field of aircraft testing, and discloses a mobile aircraft whole-aircraft thunder and lightning testing device which comprises a mobile high-voltage square cabin, a mobile monitoring square cabin, a charging system, a residual charge discharging unit and a thunder and lightning waveform generating system. Through control of a measurement and control end of a mobile monitoring shelter, a preset lightning waveform is injected into an aircraft test piece, a residual charge discharge unit intelligently starts dual-channel discharge based on real-time voltage monitoring, and meanwhile, a shelter access control lock is linked to form a test closed loop. The device can move freely, an airplane does not need to be transported to a fixed test site, the device is suitable for real-time testing in an external field or beside a production line, the whole machine can be accommodated through the closed lightning waveform generation cabin, the problem of electromagnetic coupling distortion caused by a traditional segmented test is avoided, a dual-channel redundancy discharge design is combined with real-time voltage monitoring, and the reliability of the device is improved. And the residual charge risk is thoroughly eliminated.

This invention discloses a fiber optic probe for measuring high-voltage lightning discharge on a structural coating surface, comprising: a measuring probe, an input insulator, an input copper plate, a middle insulator, a middle copper plate, a Mara tape, a copper ring, a differentiator resistor plate, a nylon column, a high-voltage non-inductive resistor assembly, an integrator capacitor plate, an integrating capacitor supporting copper plate, a photoelectric conversion plate, a fiber laser diode, an output copper plate, and a housing. This invention can measure the voltage during arc discharge on the coating surface and characterize the lightning protection performance of the coating.

This invention discloses a method for preparing a nano-modified graphene thin film sensor and its application, relating to the field of transformer fault characteristic gas detection technology. The preparation method involves dissolving AlCl3 in anhydrous ethanol, mixing it with an aqueous solution of graphene oxide, and heating and stirring until Al... 3+ The concentration of the solvent was 0.3-1.5 mol / L to obtain a sol; the sol was mixed with glycerol to obtain a coating solution; the interdigitated Cu / Ni metal electrode was immersed in the coating solution, coated, allowed to stand, heat-treated, washed, and dried to obtain an Al2O3 / GO thin film sensor, which is a nano-modified graphene thin film sensor. The prepared sensor has high sensitivity for detecting acetylene in transformer oil, fast detection response capability, and high temperature resistance.