14 results about "Electric intensity" patented technology

The invention discloses a power module packaging structure. According to the chip, a non-linear conductive material coating is arranged at the connecting part of the edge of each metal bonding pad and a chip substrate, and the connecting part of the edge of each metal bonding pad and the chip substrate is the joint of the metal bonding pad, the chip substrate and an insulating encapsulating material, namely the three-phase point. Through the arrangement of the non-linear conductive material coating, the resistivity is high in a normal low field, and electric leakage is prevented; and when the local electric field intensity is increased sharply (terminal at the three-phase junction), the resistivity is reduced sharply, the electric field is uniformly dispersed, and the peak of the local electric field is inhibited, so that the overall dielectric strength and creepage distance of the module are improved. According to the technical scheme, the insulation reliability of the power module under high-voltage, high-frequency and high-temperature working conditions is remarkably improved, particularly, partial discharge is restrained at a three-phase point, the service life of the module is prolonged, and the production and maintenance cost is reduced.

The invention discloses a high-precision multi-channel data acquisition method, relates to the technical field of multi-channel data acquisition, and is used for solving the problem that the risk of beam mode distortion caused by pumping current fluctuation is increased. Pumping current is acquired in a laser cavity to calculate a fluctuation coefficient, and an alternating-current impedance amplitude is acquired in combination with impedance detection; carrying out standardized multiplication to generate an electric strength coefficient, calibrating a statistical coefficient in time to obtain a reference threshold value, calling a gain factor, obtaining a light beam radius variable quantity by using an extra-cavity detector, calculating a down-regulation ratio to obtain a down-regulation threshold value, comparing the electric strength coefficient with the down-regulation threshold value, and if a light beam mode is distorted, carrying out standard multiplication; if yes, triggering the multi-channel wavefront sensing array to collect information and check triggering consistency, and if not, correcting a current fluctuation coefficient based on light beam intensity, combining impedance to generate an update coefficient, comparing the update coefficient with a down-regulation threshold value, and if the update coefficient exceeds the limit, triggering an alarm and outputting a protection instruction; and beam mode distortion caused by pumping current fluctuation is effectively avoided.

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 invention relates to a system (100) for determining a quantity of carbon dioxide emissions resulting from the heating of an electrical conductor of an electrical cable by Joule effect, said determination system comprising:- an electrical cable (10) comprising at least one electrical conductor (12) and at least one layer of material surrounding said at least one conductor, - a measuring unit (110) associated with the electrical cable, said measuring unit comprising at least one temperature sensor (20) and a device for measuring the electrical intensity Icond (112) of an electric current flowing in the electrical conductor,- a computing unit (120) configured to communicate information with the measuring unit, the computing unit being configured to determine the conductor temperature Θcond by means of said at least one temperature sensor,said calculation unit being further configured to determine a quantity of carbon dioxide emissions resulting from the heating of the electrical conductor by Joule effect as a function of the conductor temperature Θcond and the electrical intensity Icond in the electrical conductor. Figure for the abstract: Figure 1,

A system (100) for determination of a quantity of emissions of carbon dioxide resulting from the heating of an electrical conductor of an electrical cable by the Joule effect includes an electrical cable (10) having at least one electrical conductor (12) and at least one layer of material surrounding the at least one conductor, and a measurement unit (110) associated with the electrical cable. The measurement unit has at least one temperature sensor (20) and a device (112) for measurement of the electrical intensity Icond of an electrical current circulating in the electrical conductor. A calculation unit (120) is configured to communicate information with the measurement unit, the calculation unit being configured to determine the conductor temperature Θcond by means of the at least one temperature sensor. The calculation unit is further configured to determine a quantity of emissions of carbon dioxide resulting from the heating of the electrical conductor by the Joule effect as a function of the conductor temperature Θcond and the electrical intensity Icond in the electrical conductor.

The application discloses a kind of high surface natural micropore structure regulation-based high surface withstand voltage polyimide and preparation method and application thereof, belong to high voltage insulating material technical field, after drying diamine is dissolved in solvent A, then add dianhydride, after stirring uniformly, obtain polyamide acid solution;Add pore forming agent again, high-speed stirring is uniformly dispersed, obtain mixed viscous solution C;After coating, drying, imidization high temperature heating, and natural cooling, immerse in liquid B and extract pore forming agent, after drying, obtain high surface natural micropore structure regulation-based high surface withstand voltage polyimide.The polyimide surface has natural pore structure, surface is along the surface of electric field, and the through-hole structure is densely distributed along the surface of electric field, and the electron is easy to drop into the through-hole structure in the jumping multiplication process when flashover, and it is difficult to return to the surface, so that the secondary electron multiplication process is inhibited, the probability of forming secondary electron avalanche is reduced, so as to realize the improvement of surface withstand voltage.

The invention discloses a high-performance pulse energy storage dielectric ceramic material and a preparation method thereof, and belongs to the technical field of electronic materials. The chemical general formula of the material is Sr (0.7-x + 1.5) CdxBi (0.2-y) TiO3, x is more than or equal to 0.05 and less than or equal to 0.2, and y is more than or equal to 0 and less than or equal to 0.1. According to the invention, Cd2O3 is innovatively introduced as an A-site dopant, so that the grain boundary resistivity is remarkably improved, grains are refined, the dielectric strength reaches 285-530 kV / cm, the energy storage density can reach 4.549 J / cm < 3 > under an electric field of 430 kV / cm, and the energy storage efficiency is kept at 88-93%. The material is particularly suitable for manufacturing a pulse capacitor dielectric layer, and can meet the strict requirements of a modern pulse power system on energy storage elements. Compared with a traditional preparation technology, the method has the advantages that technological parameters are easy to control, the production process is environmentally friendly, the production cost is remarkably reduced and the like, and has a good industrial application prospect.

Provided is a method for identifying and positioning partial discharge of a high-voltage cable, which includes: collecting a partial discharge pulse signal; performing noise reduction processing on the partial discharge pulse signal to obtain a denoised partial discharge characteristic signal; inputting the denoised partial discharge characteristic signal into a pre-trained lightweight residual attention network to output a discharge type discrimination result, a discharge intensity, and characteristic parameters; and using, based on the discharge type discrimination result, the discharge intensity, and the characteristic parameters, a self-correcting dual-end localization algorithm to position a discharge source, including: measuring a time difference of arrival of the partial discharge pulse signal at the two ends of the high-voltage cable, and calculating, based on the time difference, the discharge type discrimination result, the discharge intensity, the characteristic parameters, and a length parameter of the high-voltage cable, a position of the discharge source.

The invention discloses a power equipment ultrasonic partial discharge state evaluation and health management method, and relates to the technical field of electrical equipment testing, and the method comprises the steps: carrying out the reverse gain compensation of an ultrasonic pulse waveform, and obtaining the real discharge intensity at a partial discharge source; the real discharge intensity is converted into the single discharge damage amount of the internal performance degradation degree of the insulation structure; the single discharge damage amount and the past damage amount in the historical operation process are accumulated and fused, and the total damage degree change process of degradation of the electrical equipment insulation structure evolving along with time is constructed; a dynamic health index is obtained according to the total damage degree change process; on the basis of the total damage degree change process and the dynamic health index, deducing the degradation trend of the power equipment insulation structure to a failure critical state; the residual safe operation life of the power equipment is predicted according to the degradation trend, and the fault prediction and grading operation and maintenance management level of the power equipment in the whole life cycle is improved.

The invention provides a tuyere structure, a discharge intensity self-adjusting method and static electricity elimination equipment, the tuyere structure comprises a supporting structure with a built-in hollow area, an ionization needle and a discharge intensity self-adjusting assembly, the ionization needle is located in the hollow area, the supporting structure comprises a gas supply hole and an ion detection plate, and the discharge intensity self-adjusting assembly is located in the gas supply hole. The ionization needle generates a charged particle flow according to the first discharge intensity value, and the ion detection plate is located on a circulation path of the charged particle flow, senses positive ions and negative ions in the charged particle flow and converts the positive ions and the negative ions into positive ion current and negative ion current; the discharge intensity self-adjusting assembly obtains a positive ion concentration value and a negative ion concentration value according to the positive ion current and the negative ion current, obtains a current ion balance degree value according to the positive ion concentration value and the negative ion concentration value, and adjusts a second discharge intensity value input into the ionization needle according to the current ion balance degree value. Concentrations of positive ions and negative ions in the charged particle flow can be ensured to be consistent.

The invention is suitable for the technical field of thermal management system sensing and high-voltage insulation safety, and provides a parameter calculation method of an insulation three-in-one sensor in a thermal management system. Obtaining a high voltage value, an effective insulation thickness, an electric field non-uniform coefficient and material electric strength to calculate maximum equivalent electric field intensity and an insulation margin, and taking the condition that the insulation margin meets a preset insulation margin as a structural design constraint; the output voltage of the power supply is adjusted by using a PWM duty ratio mode, and the PWM duty ratio is adjusted by using discrete PI to control the stable voltage output of the power supply; the temperature is obtained, the original pressure is read for compensation, the compensated pressure is calculated, the compensated pressure is filtered, and the corrected pressure is output; wherein the insulation margin can be calculated, threshold constraint can be set, the influence of power supply fluctuation on sensing output is reduced by controlling power supply voltage stabilization output, further, the pressure output stability and the anti-noise capability are improved by performing temperature drift compensation and fusion filtering on the pressure, and the user experience is further improved.

The invention discloses an intelligent power-off control method and system for high-voltage transmission induced electricity monitoring data fusion, and belongs to the technical field of power system safety protection. The method comprises the following steps: constructing a heterogeneous data set through a multi-dimensional induced electricity monitoring array; extracting an induced electric intensity vector and an environment parameter vector based on the heterogeneous data set, and determining a first risk level based on the induced electric intensity vector and the environment parameter vector; constructing a dynamic Bayesian risk network according to the induced electric strength vector and the environmental parameter vector, and performing real-time risk assessment to obtain a second risk level; and performing weighted integration on the first risk level and the second risk level to obtain an integrated risk level, and determining a protection action of the circuit breaker based on the integrated risk level. According to the method, fusion of the multi-source data in the feature layer and the decision layer is realized, the depth and the real-time performance of data fusion are improved, and the problem of low fusion degree of the multi-source data in the prior art is solved.

Method for performing a dielectric strength test of a high-voltage battery (50), in particular of an electrically operated vehicle, with a device (100) comprising a first DC voltage connection (10) and a second DC voltage connection (12) for electrical connection to an intermediate circuit (40) and / or an internal circuit (52) of the high-voltage battery (50), and a ground connection (14) for electrical connection to a ground potential (GND) of the high-voltage battery (50), wherein the ground connection (14) has a first switching element (16) for establishing and / or disconnecting the electrical contact to an electrical ground potential (32) of the device (100), at least comprising Electrical connection of the high-voltage battery (50) to the first and second DC voltage terminals (10, 12), as well as the ground terminal (14); Closing of contactors (54, 56) of the high-voltage battery (50); Measuring a voltage between the first and second DC voltage terminals (10, 12); and Measuring a voltage between the intermediate circuit (40) and the electrical ground potential (32) of the device (100), characterized by the fact that the first switching element (16) is opened when no voltage can be measured between the intermediate circuit (40) and the electrical ground potential (32); and / or the high-voltage battery (50) is electrically connected to a control terminal (18) of a control line (20) of the device (100) for controlling the contactors (54, 56) of the high-voltage battery (50), wherein an electrical contact between the intermediate circuit (40) and the internal circuit (52) of the high-voltage battery (50) can be established and / or disconnected by means of the control line (20), and wherein in the event of a fault the contactors (54, 56) of the high-voltage battery (50) are opened by means of a second switching element (22) of the control terminal (18) of the control line (20).

The invention provides an ion wind bar, a static elimination device and an ion balance degree adjusting method, a controller drives a high voltage generator to input alternative positive and negative voltages to each tuyere, a current ion balance degree value is obtained according to positive ion current and negative ion current input by the tuyere, and the current ion balance degree value is input to the corresponding tuyere; the tuyere comprises a supporting structure, an ionization needle, a discharge intensity adjusting unit and an ion detection plate, and the discharge intensity adjusting unit obtains a first discharge intensity value according to alternate positive and negative voltages and obtains a second discharge intensity value according to a current ion balance degree value. The ionization needle generates a first charged particle flow and a second charged particle flow respectively according to the first discharge intensity value and the second discharge intensity value, and the ion detection plate converts positive ions and negative ions into positive ion current and negative ion current; in the second charged particle flow, the positive ions and the negative ions are in an equilibrium state. Concentrations of positive ions and negative ions in the charged particle flow can be ensured to be consistent.