418 results about "High-voltage direct current" patented technology

The invention relates to an electric engine, a power device and an aircraft, and belongs to the technical field of aircraft power equipment.The electric engine comprises a power motor and a liquid cooling flow path arranged in the power motor and comprises a stator support; the heat dissipation system comprises a fan, a radiator and a heat dissipation motor, an outlet of the radiator is connected with an inlet of the liquid cooling flow path, an inlet of the radiator is communicated with an outlet of the liquid cooling flow path, and the fan is used for cooling the radiator and / or the power motor; the motor rear cover is fixedly connected with the stator bracket; and the two direct-current converters are both mounted on the motor rear cover and are both electrically connected with the heat dissipation motor. The two direct-current converters convert high-voltage direct current accessed by the electric engine into low-voltage direct current capable of being used by the heat dissipation motor, and the electricity utilization requirement of the heat dissipation motor is met. Due to the redundancy design of the two direct-current converters, when one path of low-voltage power supply breaks down, the other path of low-voltage power supply can still supply power to the heat dissipation motor in a low-voltage mode, and enough fault handling time can be provided for the whole power supply system.

The invention relates to the technical field of high-voltage electric appliance detection, in particular to a device and method for detecting the vacuum degree of a vacuum arc-extinguishing chamber, and the method comprises the steps: arranging a field emission cathode on one metal end cover of the vacuum arc-extinguishing chamber; an anode is arranged on the metal shielding cover close to the field emission cathode in the vacuum arc-extinguishing chamber; the high-voltage direct-current power supply is connected to the field emission cathode and the anode and is used for applying voltage to the electrodes so as to drive the field emission cathode to emit electron beams to impact the anode; the X-ray energy spectrum detector directly faces the anode, the X-ray energy spectrum detector is used for measuring bremsstrahlung X-ray energy spectrum generated when the electron beam impacts the anode, an electron emission source is actively arranged in the arc extinguish chamber, and the distribution of the X-ray energy spectrum generated by the electron emission source is measured. And high signal-to-noise ratio, high-precision and high-sensitivity vacuum degree quantitative detection is realized by utilizing the strong correlation between the energy spectrum form and the internal gas pressure.

A non-isolated bidirectional high-voltage direct current battery charger is made compatible with a ground-fault circuit interrupter (GFCI) at the DC output by adapting the power converter to control, in response to voltage or current sensors, a net current difference between forward current and return current to remain below a threshold of the GFCI. This can be done without compromising safety in the case of actual ground faults.

The invention discloses a server power supply system, a server, a topological structure generation method and a storage medium, and relates to the technical field of power electronics. According to the invention, a high-voltage centralized conversion-medium and low-voltage distributed distribution two-stage architecture and a physical isolation design of the first direct-current bus and the second direct-current bus are adopted, and an adaptive mounting platform is provided for load nodes such as a super-capacitor node and an energy storage node depending on the second direct-current bus; the mounting number of the load nodes can be determined based on the power required by the load nodes and the voltage and through-flow level of the second direct current bus, and high-voltage power supply conversion and power supply of the load nodes are separated, so that physical isolation of high-voltage direct current of the first direct current bus and low-voltage direct current of the second direct current bus is realized. The high-voltage direct current input is ensured to be safely, efficiently and stably distributed to each load node in the server after being converted. The problems of potential safety hazard and reliability risk caused by direct access of the high-voltage direct current to the load node, poor mounting adaptability of the load node and the like in the prior art are solved.

The invention provides a battery charging control method, a battery management system and electronic equipment, and relates to the field of lithium batteries. Aiming at the problems that a lithium ion battery is easy to separate out lithium and the charging speed is limited when the lithium ion battery is charged in a low-temperature environment, when the temperature of the battery is lower than a low-temperature threshold value, high-voltage direct-current voltage pulses are applied to the battery, and Joule heat is generated by utilizing internal impedance of the battery, so that rapid self-heating of the battery is realized. In addition, in order to avoid lithium precipitation, it is ensured that the pulse voltage is higher than the open-circuit voltage of the battery and the pulse current is lower than a safety threshold value in the high-voltage direct-current voltage pulse. Therefore, the temperature of the battery can be quickly raised to the safe charging temperature window in the low-temperature environment, so that quick charging is realized while the risk of lithium precipitation is avoided, and the usability and the safety of the battery in the low-temperature environment are remarkably improved.

The invention discloses a polypropylene grafted copolymer self-reinforced polypropylene cable insulation material and a preparation method thereof, and relates to the field of high polymer materials. The preparation method of the material comprises the following steps: firstly, preparing a polypropylene grafted copolymer by a melt grafting method or an electron beam radiation grafting method; carrying out melt blending on the master batch and polypropylene to prepare a primary master batch; and finally, carrying out melt blending on the primary master batch, polypropylene, an antioxidant, a voltage stabilizer and a processing aid to obtain the cable insulating material. The polypropylene grafted copolymer induces the matrix polypropylene to generate a beta crystal form, and the beta crystal form and the polar vinyl monomer jointly realize self-enhancement independent of an elastomer, so that the toughness, the heat resistance and the direct-current dielectric property of the material are synchronously improved, and the problem of performance reduction caused by blending of traditional elastomers is solved; the method is suitable for the high-voltage direct-current cable insulation field.

The utility model provides an active liquid cooling device for a high-voltage direct current charging gun, which relates to the technical field of charging guns and comprises a liquid cooling machine, a liquid storage tank is fixedly connected to the surface of one side of the liquid cooling machine, a pump machine is arranged at the bottom of the liquid storage tank, and a liquid outlet pipe is fixedly connected to the output end of the pump machine. The surface of the liquid cooling machine is fixedly connected with a fan, the surface of one side of the liquid cooling machine is fixedly connected with a heat exchanger, the surface of the liquid cooling machine is provided with a liquid return pipe, the surface of the liquid storage tank is provided with a filtering device, and the filtering device comprises a filtering tank. According to the liquid cooling machine, impurities in the cooling liquid can be timely and rapidly filtered, so that the purity and the effectiveness of the cooling liquid are ensured, the blockage of internal parts of the liquid cooling machine is not easily caused, the charging gun can be better cooled, and the use effect and the functionality of the liquid cooling machine are further improved.

This application relates to the field of insulated switch application technology, and particularly to a method and apparatus for characterizing partial discharge features in ultra-high voltage direct current (UHVDC) GIS. The method includes: generating a partial discharge pulse sequence based on the light signals generated by electroluminescence and gas ionization emission in the UHVDC gas-insulated switchgear; generating a spectrum of at least one parameter pair based on the amplitude and corresponding time of the partial discharge pulses; and generating a feature fingerprint map of at least one parameter pair based on the spectrum. The method also involves extracting at least one statistical feature from the kernel density sequence of the at least one parameter pair based on the feature fingerprint map, and generating a characterization result of the partial discharge feature based on the at least one statistical feature. This solves the problem that partial discharge detection is easily affected by electromagnetic interference, mechanical vibration, and environmental noise, making it difficult to effectively extract and accurately identify the actual partial discharge signal, thus affecting the accuracy and reliability of the detection results.

The application provides a non-unit two-section protection method for a high-voltage direct current power grid direct current transmission line, comprising the following steps: (1) in a normal state, real-time detection of current and voltage at the installation position of the non-unit protection is performed, and line mode voltage and zero mode voltage are obtained; when the current rate of change is greater than a threshold value, step (2) is performed; (2) fault polar selection is performed, and a pre-action instruction is then issued to a circuit breaker on a potential fault pole to perform first commutation; meanwhile, step (3) is performed; (3) a section I protection time window is started; if the voltage rate of change at the installation position of the non-unit protection meets section I protection criteria, a second commutation instruction is issued to a direct current circuit breaker to perform second commutation; otherwise, step (4) is performed; (4) a section II protection time window is started after a delay; if the line mode voltage rate of change at the installation position of the non-unit protection meets section II protection criteria, a second commutation instruction is issued to a direct current circuit breaker to perform second commutation; otherwise, a pre-action return instruction is issued to the direct current circuit breaker.

The application provides a plasma wall friction drag sensor, which is in a sheet shape as a whole and comprises a high-voltage electrode (10), a grounding electrode (20), a charge collecting electrode (30) and an insulating base (60). The application also provides a plasma wall friction drag sensor system, which comprises the above-mentioned sensor, a high-voltage direct-current power supply (701), a current-limiting resistor (702), a first discharge resistor (703), a grounding terminal (801), a first voltage amplifier (802) and a first output terminal (803). Furthermore, the working process of the above-mentioned plasma wall friction drag sensor system is given. The application also extends the above-mentioned sensor and sensor system to form a double sensor, a multiple sensor and a sensor system. The application can solve the technical problem of how to measure the airflow wall friction drag at low cost, high frequency response and robustness.

The present invention relates to a method for preparing an electrical cable comprising a step of applying an insulating layer around at least one elongated electrically conductive element from a polymer composition, wherein mineral precursors are introduced into the polymer composition prior to said application, which are then converted into mineral particles. The invention also relates to cables obtained according to this method that comprise mineral particles within their insulating layer, and which are particularly well suited for the transmission of medium- or high-voltage direct current. Figure for the abstract: NONE

The invention discloses a surge impact suppression circuit which comprises a power supply, an input positive line and an input negative line which are connected with the power supply, and a charging resistor connected with the input positive line through an electric wire, and the output end of the charging resistor is connected with a variable resistor. A common connecting line of the variable resistor and the charging resistor is respectively connected with a power-on capacitor and an equivalent resistor, an output end of the equivalent resistor is connected with a field effect transistor, a drain electrode D end of the field effect transistor is respectively connected with an output capacitor and a filter circuit, and an output end of the filter circuit is connected with post-stage equipment; according to the invention, the surge impact suppression effect on the high-voltage direct current can be realized, the impact current generated at the power-on moment of the high-voltage direct current can be effectively reduced, EMI filtering is carried out on the voltage output by the output capacitor, a post-stage circuit is prevented from external interference, and the overvoltage protection effect on post-stage equipment is realized.

The invention relates to the technical field of high-voltage cables, in particular to a crosslinked polyethylene insulated high-voltage direct-current cable, which is characterized in that an insulating layer contains a crosslinked polyethylene base material, a composite modifier, an antioxidant compound system, a nano nucleating agent, a tracking-resistant agent, a compatilizer and a smoke suppressant, the composite modifier is prepared by compounding an ethylene-vinyl acetate copolymer and a methyl methacrylate-butadiene-styrene copolymer, the antioxidant is prepared by compounding hindered phenol and phosphite ester, the nano nucleating agent is prepared from silane coupling agent KH-550 modified talcum powder and calcium carbonate, the tracking-resistant agent is prepared from melamine cyanurate and stearic acid activated magnesium hydroxide, and the lubricant is prepared from a lubricant and a lubricant. The compatilizer is maleic anhydride grafted polyethylene, and the smoke suppressant is compounded by ammonium molybdate and tin oxide. The components synergistically improve the flexibility, aging resistance and dielectric property of the insulating layer, the tracking resistance and smoke suppression are balanced, and the preparation process solves the problem of additive agglomeration, accurately controls the crosslinking degree, reduces the internal stress and improves the performance uniformity.

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

The utility model relates to lighting equipment technical field, especially a kind of electrical system of high-voltage direct current power supply with emergency function, including ac distribution unit, HVDC unit, main control unit, direct current distribution unit, leakage detection unit, emergency energy storage unit, communication network, high-voltage direct current network and distributed lighting node;The ac distribution unit, HVDC unit, main control unit, direct current distribution unit and leakage detection unit are integrated in control cabinet;Ac distribution unit is connected with HVDC unit and main control unit;HVDC unit is connected with main control unit, emergency energy storage unit and distributed lighting node and supplies power;Main control unit is communicated with HVDC unit, emergency energy storage unit, direct current distribution unit and leakage detection unit, distributed lighting node by communication network;Emergency energy storage unit is connected with communication network and high-voltage direct current network.The utility model can realize more quickly, more reliable, more high integration degree's emergency control.

We provide a multi-port interleaved charge pump bidirectional DC-DC converter that allows multiple ESSs to be connected to a DC microgrid system with a single bidirectional DC-DC converter. [Solution] The system comprises two two-phase interleaved charge pump bidirectional DC-DC converters, three charge pump capacitors, and a drive circuit that controls each switch of the DC-DC converters. The negative terminals of the two DC-DC converters are common-connected, the low-voltage sides of the two DC-DC converters are connected to two different low-voltage DC voltage sources, the high-voltage sides of the two DC-DC converters are multiple-connected, and the inductors that constitute the interleaved system but are not connected to the charge pumps are connected to the connection point via three charge pump capacitors and connected to one high-voltage DC voltage source.

The embodiment of the application discloses a parameter acquisition method of an oscillation waveform detection system, relates to the technical field of power system control, and accurately acquires the equivalent resistance value, the equivalent inductance value and the equivalent distributed capacitance value of a winding of a transformer to be measured, the output voltage of a high-voltage direct-current power supply, the maximum input voltage of a data acquisition module, the maximum charging current value allowed by a charging detection loop and the like, and based on the indexes, the first capacitance value of a parallel capacitor, the second capacitance value of a voltage division capacitor, the third capacitance value of a measurement capacitor and the resistance range of a current limiting resistor in the oscillation waveform detection system are acquired, the uncertainty caused by empirical design is avoided, the quality of generated oscillation waveforms is ensured to be stable and controllable, consistent and reliable detection results on transformers of different capacities and voltage grades are ensured, and the accuracy and universality of the oscillation wave detection method in practical application are improved.

The invention discloses a full-direct-current offshore wind power system zero-voltage ride-through method, equipment and a medium, and relates to the field of full-direct-current offshore wind power. The objective of the invention is to solve the problem that a receiving-end converter station cannot transmit power when a land AC power grid breaks down. When the high-voltage direct-current voltage of the offshore direct-current transformer exceeds the first preset threshold value, the medium-voltage direct-current voltage control of the offshore direct-current transformer is switched to the high-voltage direct-current voltage control, so that the offshore direct-current transformer absorbs power from a high-voltage direct-current link; when the medium-voltage direct-current voltage of the fan direct-current transformer exceeds a second preset threshold value, the fan direct-current transformer is switched from low-voltage direct-current voltage control to medium-voltage direct-current voltage control, so that the fan direct-current transformer can absorb power from the low-voltage direct-current voltage side through a fan grid-side direct-current transformer; and when the low-voltage direct-current voltage of the offshore direct-current transformer exceeds a third preset threshold value, the brake resistor is activated to dissipate surplus power until the low-voltage direct-current voltage is lower than a fourth preset threshold value.

The invention provides a switch control circuit, and relates to the technical field of high-voltage circuit control. The switch control circuit is applied to a power supply system, the power supply system comprises a high-voltage direct-current power supply and electric equipment, and the switch control circuit comprises a control module, a driving module, a plurality of voltage transformation modules, a plurality of rectification modules and an IGBT switch module. The input end of the driving module is connected with the control module, the voltage transformation module is connected with the driving module, the rectification module is connected with the voltage transformation module, the input end of the IGBT switch module is connected with a high-voltage direct-current power supply, the output end of the IGBT switch module is connected with electric equipment, the IGBT switch module comprises a plurality of IGBT units which are sequentially connected in series, the IGBT units are connected with the rectification module, and the rectification module is connected with the control module. And the IGBT unit is used for controlling on-off of power supply of the high-voltage direct-current power supply to the electric equipment. On the basis that low-cost design and small-size integration are achieved, high-reliability operation and high-speed response performance are achieved at the same time.

The invention discloses an external extra-high voltage direct current sending end optimization method and system based on a key index evaluation system. The method comprises the following steps: constructing an evaluation index system; acquiring data of each to-be-selected sending end under each index in the evaluation index system and performing preprocessing; determining a weighted standard value of each index according to the preprocessed data; based on the weighted standard value of each index, an improved TOPSIS model is adopted to calculate the comprehensive close degree of each sending end to be selected; and sorting the to-be-selected transmitting ends according to the comprehensive close degree of the to-be-selected transmitting ends, and selecting the most suitable extra-high-voltage direct-current transmitting end outside the area based on a sorting result. The multi-dimensional evaluation index system is constructed, the subjective and objective combined weights and the improved TOPSIS model are combined, quantitative evaluation of the sending end optimization process is achieved, and the method has the advantages that evaluation objectivity, comprehensiveness and weight scientificity are improved, and sending end optimization accuracy is improved.

The invention provides a method for calculating the surface breakdown field intensity of a high-voltage direct-current insulator. The method comprises the following steps: 1) calculating a direct-current air gap discharge field intensity expected value Ed; 2) designing the specification of the tested insulation sample according to the Ed obtained in the step 1); 3) loading the tested insulation sample into a test device for breakdown test to obtain a lightning impulse voltage and direct current voltage superposed breakdown voltage U0; and 4) calculating the superposition breakdown field strength E of the lightning impulse voltage and the direct-current voltage of the insulation sample according to the U0. The complete method for calculating the superposition breakdown field intensity of the lightning impulse voltage and the direct-current voltage is provided, the specification of the tested insulation sample is reasonably determined based on the expected value of the negative polarity direct-current air gap discharge field intensity, then the field intensity is calculated, and the field intensity design reference of the direct-current insulator is provided for the design of the high-voltage direct-current insulator.

The invention relates to the technical field of power grid fault diagnosis, and discloses an extra-high-voltage direct-current power transmission system fault analysis method based on a direct-current recording file, and the method comprises the steps: firstly, periodically and automatically querying each protection device through a timed task, and achieving the automatic obtaining of a newly-added direct-current recording file; secondly, analyzing a plurality of acquired scattered direct-current recording files, extracting protection action trigger signals in the direct-current recording files, performing global time mark alignment according to accurate timestamps in file names, and constructing a unified protection action time sequence; and finally, according to a pre-established protection action-fault area corresponding relation library, performing intersection operation on a plurality of possible fault area sets corresponding to action protection to realize logical reasoning and accurate positioning of a unique fault area. According to the invention, the whole process automation from data acquisition to diagnosis conclusion is realized, the efficiency and accuracy of fault analysis are improved, and the dependence on the experience of operation and maintenance personnel is reduced.

The utility model relates to vehicle air conditioner compressor detection technical field, concretely relates to a kind of dynamometer function detection safety electrical connection mechanism:Including starting contactor, discharge contactor, high voltage capacitor, discharge resistance, LED pilot lamp, test start button and test stop button, starting contactor and high voltage capacitor are set in high voltage direct-current power supply and the high voltage direct-current bus of measured controller assembly, starting contactor controls power on-off, high voltage capacitor can inhibit the inrush current when contactor action, reduce the impact to measured controller assembly, avoid TVS tube burst, test stop, discharge contactor attraction, discharge through discharge resistance for high voltage capacitor, LED pilot lamp real-time display discharge state, guarantee the safety of operator, measured controller assembly is connected with measured permanent magnet synchronous motor, operating computer communication, ensure that test data accurate acquisition and analysis, improve the security and data accuracy of test process.

The utility model relates to relay technology field discloses a high voltage direct current relay, high voltage direct current relay includes: the coil framework, the coil framework is integral type structure, the kovalev alloy spare, kovale g alloy spare is located on the coil framework, and the annular structure is fixed on kovale g alloy spare, the ceramic cover, the ceramic cover is located in kovale g alloy spare, and the two sides of ceramic cover are fixed with the arch structure, the utility model discloses high voltage direct current relay, wherein designs integral type coil framework, can to the coil winding, increase the space in the enameled wire wire head winding process, promote the smoothness in enameled wire wire head access and winding process, improved the production efficiency of the automatic winding of electromagnetic coil, wherein kovale g alloy spare is separated from copper pipe, simplifies kovale g alloy spare's structure, improves production efficiency, guarantees kovale g alloy spare and ceramic structure's air tightness, and increases the arch structure on ceramic structure, provides the space of installation layout for copper pipe, auxiliary contact structure etc.

An energy supporting device for a high voltage direct current, HVDC, transmission system includes an energy supporting device for providing grid forming and / or virtual synchronous machine, VSM, capabilities to the HVDC transmission system. The energy supporting device comprises a plurality of cells configured to be connected to the HVDC transmission system, and a cell includes a full-bridge arrangement of power switches, an energy storage device electrically connected to the full-bridge arrangement, a resistor electrically connected between the plurality of cells and an electrical reference potential, and a bypass switch configured to allow the resistor to be bypassed. The energy supporting device is configured to be operated in a dissipation mode, in which the bypass switch is in an open state for allowing the resistor to dissipate electrical energy from the HVDC transmission system, and in which the energy storage devices of the plurality of cells are bypassed.

The application discloses a direct-current networking wind generator system and a control method thereof, adopts decentralized and decentralized power generation control, and comprises a wind generator set, a generator controller, an energy storage battery system and a PCS converter; the wind generator set adopts a doubly salient direct-current excitation generator assembly; the generator controller can convert three-phase alternating current output by the doubly salient direct-current excitation generator assembly into high-voltage direct-current shaft voltage through a full-bridge diode rectification filter circuit, and an additional machine end inverter is not needed; each generator controller is connected with one wind generator set, and a plurality of generator controllers are connected in parallel through a direct-current bus. The direct-current voltage output by the doubly salient direct-current excitation generator assembly can automatically follow the common direct-current bus voltage and keep dynamic stability, and will not fluctuate with the dynamic change of the wind turbine speed; the current backflow phenomenon and the crosstalk problem can be effectively avoided, and the wind turbine industry multi-machine direct-current networking demand is perfectly met.

The invention discloses a wide-voltage PMOS driving circuit and method, and the circuit comprises a power tube MP, and also comprises a high-voltage DC source which is connected with the source electrode of the power tube MP and is used for providing a high-voltage DC voltage; the level shifting module is connected with the high-voltage direct current source and is used for generating a reference ground voltage VSS2 of a high-voltage domain; the control module is used for receiving and processing an external control signal Drv0 to generate a first driving signal, a second driving signal and a third driving signal; the driving module comprises a first auxiliary pull-down unit, a second auxiliary pull-down unit and an auxiliary pull-up unit, and the first auxiliary pull-down unit and the second auxiliary pull-down unit are both connected with the control module and the grid electrode of the power tube MP and used for controlling conduction of the power tube MP according to the first driving signal and the second driving signal; and the auxiliary pull-up unit is connected with the control module and the grid electrode of the power tube MP, and is used for controlling the turn-off of the power tube MP according to the third driving signal.

This invention discloses a self-reinforced polypropylene cable insulation material and its preparation method using a polypropylene graft copolymer, relating to the field of polymer materials. The preparation method includes: firstly, preparing a polypropylene graft copolymer via melt grafting or electron beam radiation grafting; subsequently, melt-blending the copolymer with polypropylene to prepare a primary masterbatch; and finally, melt-blending the primary masterbatch with polypropylene, an antioxidant, a voltage stabilizer, and processing aids to obtain the cable insulation material. This invention induces the matrix polypropylene to produce a β-crystal form through the polypropylene graft copolymer. The β-crystal form and polar vinyl monomers together achieve elastomer-independent self-reinforcement, simultaneously improving the material's toughness, heat resistance, and DC dielectric properties. This solves the performance degradation problem caused by traditional elastomer blending and is suitable for high-voltage DC cable insulation.

The present application relates to the technical field of cable insulation core electrical performance test, especially to a kind of double-layer insulation insulation resistance temperature coefficient test method.The method comprises the following steps: preparing double-layer insulation core sample, oven pretreatment is carried out to double-layer insulation core sample, eliminate internal residual stress and moisture interference of sample;Sample surface is wiped with anhydrous alcohol;The sample with assembled electrode is placed on the insulation grid support in the high-low temperature testing machine;Temperature interval is set;DC high voltage is applied to the sample through high-voltage DC power supply and protection resistor;Insulation resistance is calculated according to formula.The present application eliminates internal stress and moisture of sample by 50 DEG C / 24h oven pretreatment, which is consistent with actual sample production process;Surface impurities and cavity leakage interference are eliminated by alcohol surface purification and insulation grid support;Standardized three-electrode winding, constant temperature duration, pressure parameters are used, and test process is unified, with high data repeatability.

The application relates to the technical field of testing and application of power semiconductors, in particular to a SiC MOSFET gate oxide layer reliability testing device and method. The device is provided with a high-voltage direct-current voltage power supply, an auxiliary direct-current voltage source, a signal generating device, a half-bridge testing circuit, a gate driving circuit, a load inductor, a load resistor and a measuring device, can significantly shorten the stress time required for device reliability evaluation, can more accurately describe the device threshold voltage drift characteristics under different drain-source voltage stresses, compared with the traditional static bias and gate switching stress test method, effectively introduces the influence of dynamic drain-source voltage and current, improves the accuracy of the model test result, and has certain application value for SiC MOSFET gate oxide layer reliability evaluation.