37 results about "Flashover voltage" patented technology

The invention belongs to the technical field of electrical experiments, and particularly relates to an insulating material charge accumulation and flashover device and method under different tangent and normal electric fields, an insulating sample wafer of the device is arranged on a surface flashover assembly, and the surface flashover assembly is provided with an electrode assembly with an adjustable inclination angle; a lower plate electrode is arranged in the middle of an insulating support, a supporting rod assembly vertically penetrates through a middle through hole of the lower plate electrode to make contact with a polytetrafluoroethylene insulating plate, an insulating sample piece is arranged above the polytetrafluoroethylene insulating plate, the polytetrafluoroethylene insulating plate is hinged to the lower plate electrode, and the lower end of the supporting rod assembly is connected with a rotary driving mechanism. The rotary driving mechanism drives the supporting rod assembly to move to incline the insulating sample, and the lifting driving mechanism drives the supporting rod assembly to vertically move to enable the insulating sample to be in contact with the electrode assembly; the device has the capabilities of charge injection and charge measurement of the insulation sample wafer and measurement of flashover voltage and initial voltage along the surface of the insulation material under different tangential and normal electric fields.

The embodiment of the invention discloses an insulator pollution flashover test method considering the property of a pollution source, and the method comprises the steps: carrying out the pollution treatment of a sample insulator according to the property of the pollution source, and obtaining a test insulator; arranging the test object insulator and a test environment thereof; applying low voltage and steam mist to the test object insulator to enable the test object insulator to reach a saturated wet state; according to the method, a pollution test is carried out on the test object insulator by adopting a gradually-decreasing constant voltage method to obtain the flashover voltage of the test object insulator, the test object insulator can be smeared in a targeted manner according to the pollution source property of a certain area, and then the flashover voltage is obtained through the test, so that the representativeness and typicality of the test are improved, and more accurate test data are obtained; and guidance is provided for insulation configuration and operation maintenance of the power transmission line in the region.

The application discloses an air insulation structure verification method and device based on surface flashover voltage calculation, a terminal equipment and a storage medium, and belongs to the technical field of voltage testing. The method comprises the following steps: obtaining an original structure parameter set; establishing a three-dimensional model according to the original structure parameter set; performing steady-state simulation on the three-dimensional model to obtain an initial electric field distribution; correcting the initial electric field distribution according to surface roughness to obtain a first corrected electric field distribution; performing transient simulation on the three-dimensional model to obtain a surface charge density distribution; correcting the first corrected electric field distribution according to the surface charge density distribution to obtain a second corrected electric field distribution; accumulating the volume with a second corrected electric field value not less than a preset gas critical ionization field strength to obtain a critical volume; and calculating the surface flashover voltage based on the critical volume, and verifying the original insulation structure according to the surface flashover voltage. Therefore, by implementing the application, the problem of inaccurate surface flashover voltage calculation in the prior art can be solved.

The application discloses a high-speed rail roof insulator surface flashover voltage prediction method, medium and system, comprising the following steps: obtaining a first simulation value of airflow parameters on the surface of an insulator based on a preset value of airflow parameters in front of the high-speed rail roof insulator through a simulation experiment; obtaining an experimental value of the surface flashover voltage of the insulator under an airflow environment based on the preset value and the first simulation value of the airflow parameters through a wind tunnel experiment; training a prediction neural network by using the preset value of the airflow parameters, the first simulation value of the airflow parameters and the experimental value of the flashover voltage; obtaining a second simulation value of the airflow parameters on the surface of the insulator based on a measured value of the airflow parameters in front of the insulator through a simulation experiment; and inputting the measured value of the airflow parameters in front of the insulator and the second simulation value of the airflow parameters on the surface into the trained prediction neural network to output a prediction value of the surface flashover voltage of the high-speed rail roof insulator. The application can realize the prediction of the surface flashover voltage of the high-speed rail roof insulator under strong airflow.

An anti-pollution flashover type sleeve belongs to the technical field of sleeves for transformer substations and comprises an upper-end metal accessory, an upper-end cement adhesive layer, a porcelain piece and a semiconductor glaze layer. A plurality of first umbrellas are integrally arranged above the outer side of the porcelain piece, and a plurality of second umbrellas are integrally arranged below the outer side of The surface of the first umbrella is provided with a semiconductor glaze layer. The surface of the second umbrella is provided with an electric porcelain glaze layer. The first umbrella with a large diameter is arranged to be an umbrella with a larger diameter, so that the rain-proof and icing-proof capabilities of the sleeve can be improved; and meanwhile, the creepage distance and the large umbrella surface area are increased, and the specific capacitance of the first umbrella porcelain surface is reduced, so that the gliding lightning voltage of the sleeve is improved. The semiconductor glaze is applied to improve the electric field distribution around the high-voltage metal accessory at the upper end, so that the discharge is not easy to develop, and the flashover voltage and the corona initial voltage are improved. The surface temperature of the porcelain is increased by 1-5 DEG C higher than the ambient temperature, so that a dirt layer absorbing moisture and dust can be dried, ice melting is promoted, ice flashover is prevented, and the purpose of pollution flashover prevention is achieved.

The present application belongs to the field of direct current transmission, and particularly relates to a support insulator, an insulating support structure and a direct current GIL. In order to solve the technical problem that the electric field lines pass through the support insulator in the prior art, resulting in that the normal field intensity of the side surface of the support insulator is too large, the present application provides a support insulator, which comprises a high-potential support surface for supporting a conductive rod, a low-potential support surface for supporting an insulating cylinder and a side surface, the high-potential support surface and the low-potential support surface are both arc surfaces, the axis of the high-potential support surface and the low-potential support surface corresponds to the axis of the matched conductive rod, and the extension line of the projection of the side surface of the support insulator in the direction of the axis of the corresponding conductive rod intersects with the axis of the conductive rod. The present application further provides an insulating support structure and a direct current GIL using the support insulator. By making the electric field lines parallel to the side surface of the support insulator, the normal field intensity of the side surface of the support insulator can be reduced, and the surface flashover voltage and the insulating strength of the support insulator can be improved.

According to the power distribution network risk assessment method under the lightning and rainstorm composite disaster based on the blind number theory, the influence of rainfall intensity on the insulation flashover voltage of the power distribution line is considered to construct the power distribution line fault probability model, and the influence of rainfall intensity on the insulation margin of the fan blade is considered to construct the fan fault probability model; constructing a transformer fault probability model; selecting a typical fault scene of the power distribution network under the lightning and rainstorm composite disaster by adopting an information entropy method; respectively representing the load loss rate, the distribution line heavy load proportion, the transformer heavy load proportion and the node voltage out-of-limit proportion as different blind numbers, calculating the risk measurement of each risk assessment index through the expectation operation of the blind numbers, and then synthesizing the weights of different risk assessment indexes to calculate the fusion value of the power distribution network risk assessment indexes. And determining the risk level of the power distribution network. According to the invention, the accuracy and comprehensiveness of power distribution network risk assessment under lightning and rainstorm composite disasters can be improved.

The embodiment of the invention relates to a structural data determination method and device for an umbrella skirt damage insulator, equipment and a medium. The method comprises the steps that umbrella skirt damage data of a current insulator and insulation attribute data of a complete insulator corresponding to the current insulator are acquired; determining a first relation function, a second relation function and a third relation function corresponding to the umbrella skirt damage data; wherein the first relation function represents the relation between the pollution flashover voltage and the creepage distance, the second relation function represents the relation between the grading ring field intensity and the grading ring pipe diameter, and the third relation function represents the relation between the umbrella skirt field intensity and the cover depth; and determining improved structure data corresponding to the current insulator according to the insulation attribute data, the first relation function, the second relation function and the third relation function. Therefore, the insulation characteristic of the insulator still meets the required insulation effect after the umbrella skirt is damaged.

The invention provides a gas-phase fluorination regulation and control method for synchronously improving internal and external insulating properties of an extra-high-voltage direct-current wall bushing, and relates to the technical field of power transmission and transformation equipment of a power system. According to the method, the electric-thermal-mechanical coupled multi-physical field simulation model is established, iteration with experimental data is carried out, the fluorination reaction rate of the surface of the epoxy resin core rod and the fluorination layer thickness of the silicone rubber outer insulation layer are synchronously regulated and controlled by adopting a collaborative fluorination process, and the gas-solid interface breakdown voltage and the outer insulation surface flashover gradient of the sleeve are respectively improved by about 20% and 25%. Experiment and simulation results show that the method can effectively regulate and control gas-solid interface charge distribution, inhibit electric field distortion and improve surface flashover voltage; the direct fluorination treatment obviously enhances the breakdown strength and surface flashover tolerance of the high polymer material, obviously improves the overall insulation performance of the bushing under the extra-high voltage direct current working condition, and solves the technical problem of synchronous improvement of the internal and external insulation performance of the extra-high voltage wall bushing.

The invention discloses a ceramic vacuum insulator with a three-dimensional microstructure on the surface and a preparation method of the ceramic vacuum insulator, and solves the technical problems that an existing modified ceramic insulator cannot be used in a high-temperature environment, and an existing vacuum surface flashover voltage boosting method is limited in application range, high in equipment requirement, complex in operation and the like. The ceramic vacuum insulator comprises a ceramic vacuum insulator base body and a three-dimensional microstructure coating the surface of the ceramic vacuum insulator base body, the three-dimensional microstructure is formed by interweaving micron wires in a three-dimensional space on the surface of the ceramic vacuum insulator substrate; and the micro-wire adopts a polymethylsiloxane micro-wire of which the surface is subjected to high-temperature ceramic treatment. The three-dimensional micro-structure can improve the vacuum surface voltage withstanding level of the insulator, and after high-temperature ceramization, the insulator with the three-dimensional micro-wire structure on the surface can be applied to the high-temperature environment of 800 DEG C or below and has the high-temperature insulation characteristic, so that the application range of the ceramic vacuum insulator is widened.

The application provides a lightning storm composite disaster-based distribution network risk assessment method based on blind number theory, considers the influence of rainfall intensity on the insulation flashover voltage of the distribution line to construct a distribution line fault probability model, considers the influence of rainfall intensity on the insulation margin of the fan blade to construct a fan fault probability model, and constructs a transformer fault probability model; the information entropy method is used to select a typical fault scene of the distribution network under the lightning storm composite disaster; the loss of load rate, the heavy load proportion of the distribution line, the heavy load proportion of the transformer and the node voltage out-of-limit proportion are respectively expressed as different blind numbers, the risk measurement of each risk assessment index is calculated through the expectation operation of the blind numbers, the weight of different risk assessment indexes is comprehensively considered, the fusion value of the distribution network risk assessment index is calculated, and the risk grade of the distribution network is determined. The application can improve the accuracy and comprehensiveness of the distribution network risk assessment under the lightning storm composite disaster.

According to the insulation protection device of the antenna feed tube current inductor, the upper small corrugated section, the middle smooth section and the lower large corrugated section are arranged on the insulation sleeve, the smooth surface of the upper corrugated section and the smooth surface of the lower large corrugated section are changed into the surfaces of the wave structures, the surface flashover length of the insulation sleeve is increased, and when the discharge distances are the same, the flashover length of the insulation sleeve is increased; the surface flashover voltage is lower than the breakdown voltage of a pure air gap, air breakdown does not occur firstly between the inner walls of the wave surfaces, surface flashover occurs on the inner edges of the wave surfaces, and the surface flashover voltage of the insulation sleeve can be remarkably increased by increasing the surface discharge length of the surface of the insulation sleeve; and the lower large corrugated section can also overcome the electric field distortion and point discharge danger caused by the electric field intensity generated after the electric part at the bottom of the base is electrified. And the middle smooth section and the current inductor are arranged at intervals, so that the voltage monitoring performance is improved, the surface of the insulating sleeve is convenient to clean, and the problem of pollution discharge caused by long-time use is solved.

This invention discloses a rapid prediction method for insulator surface flashover voltage considering microscopic surface collisions, achieving a balance between computational efficiency and microscopic physical accuracy. The method innovatively maps the macroscopic roughness of the insulator to the collision restitution coefficient (characterizing kinetic energy dissipation), local electric field enhancement factor (characterizing microscopic distortion), and diffuse reflection distribution model of microscopic particles. Under electric field driving, particle trajectories are iteratively calculated, and velocity reduction and local field strength correction are performed based on the aforementioned dual competition mechanism when particles collide with the interface. Finally, the effective ionization coefficient is integrated in the time domain with velocity weight along the microscopic trajectory, and the flashover voltage is iteratively output by comparing it with the streamer critical criterion. This method, by introducing a particle tracking mechanism, maps macroscopic surface roughness to microscopic collision restitution coefficients and diffuse reflection distribution, and proposes a time-domain integration model, achieving efficient and accurate prediction of flashover voltage.

The electrolyte of the aluminum electrolytic capacitor comprises 50-80 parts by weight of a solvent, 10-40 parts by weight of a solute, 5-20 parts by weight of a sparking voltage boosting agent and 1-10 parts by weight of an additive, and the additive comprises ammonium dihydrogen phosphate or a mixture of ammonium dihydrogen phosphate and 24-carbon multi-branched chain ammonium tetracarboxylate. After the ammonium dihydrogen phosphate and the 24-carbon multi-branch chain ammonium tetracarboxylate are added into the electrolyte, the ammonium dihydrogen phosphate and the 24-carbon multi-branch chain ammonium tetracarboxylate can form an organic matter-inorganic matter composite adsorption layer; ammonium dihydrogen phosphate can prevent a large number of holes from being formed in a generated oxidation film; the 24-carbon multi-branched chain ammonium tetrapolycarboxylate can be further adsorbed to positions with relatively high energy, such as micro cracks and hole edges on the surface of the oxidation film; therefore, a layer of compact protective film is formed, and a stable interface environment is created for repairing the oxidation film; the oxide film repaired by the electrolyte is continuous and compact; therefore, the leakage current performance of the aluminum electrolytic capacitor is improved.

This invention provides a method for predicting surface flashover voltage in a perfluoroisobutyronitrile (PFOS) mixed gas based on plasma dynamics. It comprehensively considers the effects of gas molecule desorption and collisional ionization, surface charge accumulation at the gas-solid interface, and carrier traps in the solid medium on the solid side. A surface flashover model is constructed, and by solving the continuity governing equations, Poisson's equation, and local field approximation equations for charged particles, the spatiotemporal distribution of the electric field intensity and the transport of charged particles in space are obtained, serving as a means to predict the surface flashover voltage. This invention not only predicts surface flashover voltage but also holds promise as a data reference for the development of environmentally friendly insulating gas equipment, saving experimental costs and improving R&D efficiency.

The invention provides a method for predicting lower surface flashover voltage of perfluoroisobutyronitrile mixed gas based on plasma dynamics, which comprises the following steps of: constructing a surface flashover model by comprehensively considering the influence of desorption and collision ionization of gas molecules related to a gas side, charge accumulation on the surface of a gas-solid interface and a carrier trap existing in a solid medium on a solid side; by solving a continuity control equation, a Poisson equation and a local field approximation equation of the charged particles, the spatial and temporal distribution condition of the electric field intensity and the transport condition of the charged particles in the space are obtained as a means for predicting the surface flashover voltage. The method not only can predict the surface flashover voltage, but also is expected to serve as data reference for research and development of environment-friendly insulating gas equipment, test cost is saved, and research and development efficiency is improved.

This invention provides a method and system for configuring icing insulation for insulator strings at ultra-high voltage / extra-high voltage levels. It involves obtaining the flashover voltage of the first insulator string through artificial flashover experiments at different pollution levels and altitudes, determining the altitude correction coefficient for the first insulator string at different altitudes, as well as the flashover voltage and pollution withstand voltage of individual insulator pieces. Then, based on a second correction coefficient, a third correction coefficient, and the pollution withstand voltage, the flashover voltage of individual insulator pieces of the second insulator string at 0 meters altitude under natural conditions is determined. Finally, based on the altitude correction coefficient, system voltage, and the flashover voltage of individual insulator pieces of the second insulator string, the icing insulation configuration of the second insulator string is determined. This method and system are applicable to the design of polluted external insulation in ultra-high voltage / extra-high voltage transmission and transformation projects, significantly reducing the workload of testing and solving the problem of simulating and controlling the icing state of certain insulators.

The invention relates to an insulator accelerated dirt retention test method and device based on electrostatic adsorption, and the method comprises the following steps: placing a dirt retention insulator in a test chamber, transmitting a DC high voltage to the dirt retention insulator to generate an electrostatic field, blowing simulated natural dirt particles to the dirt retention insulator, and carrying out the electrostatic adsorption on the dirt retention insulator; the dirt deposition insulator electrostatically adsorbs simulated natural dirt particles, an environment simulating natural humidity, sunlight and wind is formed in the test chamber, and simulation of natural dirt deposition of the dirt deposition insulator is accelerated; and after the natural dirt accumulation of the dirt accumulation insulator reaches a set period, testing the salt dust density pollution degree and the pollution flashover voltage of the dirt accumulation insulator for analyzing the dirt accumulation characteristics. According to the insulator, deposition of dirt is accelerated through the adsorption effect of an electric field generated by direct-current high voltage, attachment and accumulation of the dirt are accelerated by simulating humidification, sunlight and wind, and therefore simulation of natural dirt accumulation is accelerated to the maximum extent, and an effective method and means are provided for studying the pollution flashover performance of the insulator and the dirt accumulation characteristic of the insulator.

The invention provides an epoxy core surface gas phase fluorination regulation and control method for an extra-high voltage direct current wall bushing, which comprises the following steps of: using fluorine-containing mixed gas in a closed system; and carrying out surface modification treatment on the epoxy resin-based composite material under the conditions that the reaction temperature is 20-120 DEG C, the temperature gradient is 0.1-5 DEG C / cm, the reaction pressure is 10-200 kPa and the reaction time is 10-180 minutes, so as to obtain the epoxy resin-based composite material with the flashover voltage of 110-120 kV / cm. By regulating and controlling fluorination modification conditions, a chemically bonded gradient fluorination layer is constructed on the surface of the epoxy resin-based composite material, so that the surface charge decay time of the epoxy resin-based composite material is less than or equal to 30s, and interface charge accumulation is remarkably inhibited; the interface bonding strength is greater than or equal to 10MPa; according to the invention, the electric arc resistance is improved by more than or equal to 10%, the flashover voltage is improved by more than or equal to 30%, the problems of electric field distortion and insulation deterioration caused by epoxy resin / SF6 interface charge accumulation are solved, and the long-term operation reliability of the DC bushing in an SF6 gas environment is remarkably improved.

The invention relates to a dynamic cooperative flashover control method and system for an electric precipitator, and belongs to the technical field of electric precipitator power supply control. The method comprises the following steps: collecting dust concentrations of an inlet and an outlet of the electric dust remover and secondary voltage and secondary current data of each internal electric field, setting flashover frequency values of the head and tail electric fields according to a comparison result of the dust concentration values and a preset mapping curve, and calculating flashover frequency set values of each internal electric field by adopting a gradient coefficient; when flashover occurs in the single electric field, the closing duration time of the high-voltage power supply is controlled according to the charge release time constant of the dust layer, and then the flashover critical voltage is recovered through the two-stage boosting process; when flashover occurs in the multiple electric fields at the same time, the flashover electric field voltage is dynamically reduced according to the flashover voltage and the real-time frequency, and the normal electric field voltage is correspondingly increased; according to the method, optimal distribution of global energy can be realized, so that the dust removal efficiency is improved, and flashover is inhibited.

This invention relates to the field of high-voltage insulation technology, specifically disclosing a method for improving the external insulation performance and weather resistance of a DC through-wall bushing, comprising the following steps: (1) performing ultraviolet grafting and sol-gel coating pretreatment on the silicone rubber insulator of the bushing assembly; (2) performing gradient fluorination on the pretreated silicone rubber, and then performing gradient drying of the entire bushing assembly from low temperature to high temperature; (3) performing drying pretreatment on the metal parts, then performing co-assembly of the metal parts and the bushing assembly, and finally encapsulating SF6 gas to achieve a synergistic improvement in the interface insulation performance of the DC bushing. This invention forms a molecular-level fluorine atom pre-assembled layer on the surface of silicone rubber through a specific pretreatment process. This structure effectively reduces the crack density of the fluorinated layer, increases the flashover voltage, reduces interfacial charge accumulation, and significantly enhances the hydrophobicity, electrical erosion resistance, and anti-pollution flashover capability of the material surface.

The present application relates to the field of high-voltage engineering and insulation technology, and particularly relates to a method for artificial contamination test under high-voltage environment, which comprises the following steps: firstly, constructing a target deposition distribution function and a target response set on a parameterized grid on the surface of an insulator, and merging an environmental boundary condition time sequence set to form a target deposition and response data set; then, implementing layered deposition of soluble contaminants and insoluble particles under the electrode system time-varying electric field and particle charging control in the on-power state, collecting surface state field to generate an in-situ deposition state data set; then, obtaining electrical and surface responses and estimating a median flashover voltage according to segmented loading and stepwise flashover test to form an electrical and physical response data set; finally, based on the kinetic model, closed-loop optimization is performed on the electrode system time-varying trajectory, the environmental program and the deposition spectrum within the leakage current constraint. The present application realizes reproducible configuration, stable threshold estimation and fast test convergence.

This utility model discloses a rod-type insulator with a protective structure, including an insulator body and an outer protective structure. The insulator body comprises a core rod, sheds, and fittings at both ends. The protective structure includes a nano-composite anti-flashover layer on the outer surface of the sheds, a bird-proof device on top, and a honeycomb structure of a polyurethane impact-resistant buffer layer between the core rod and the sheds. The fittings are connected to the core rod by an epoxy resin adhesive containing nano-alumina and a silane coupling agent. The anti-flashover layer reduces surface resistivity and increases flashover voltage; the bird-proof device forms a dual physical and acoustic bird-repelling barrier; the buffer layer effectively absorbs impact energy; and the improved adhesive enhances connection stability. This utility model constructs a multi-dimensional protection system, significantly improving the operational reliability and service life of the insulator in complex environments such as pollution, bird damage, and impact.

The invention discloses an early warning analysis method for extreme meteorological windage yaw flashover of a power transmission line. The early warning analysis method comprises the following analysis steps: S1, collecting information and meteorological data of the power transmission line; s2, calculating the maximum wind deflection angle of the line suspension insulator through a rigid body straight rod model; s3, the minimum air gap is calculated according to the maximum wind deflection angle, and the line wind deflection flashover voltage under the corresponding gap condition is obtained; s4, based on the line windage yaw flashover voltage and the line operation voltage, obtaining a line windage yaw flashover probability; s5, evaluating the line windage yaw flashover risk based on the line windage yaw flashover probability, and giving an early warning; the method can accurately reflect the actual influence of a non-stationary wind field and meteorological factors on the power transmission line, gives out risk early warning, and guarantees the safe and stable operation of the power transmission line.

This invention discloses a plasma surface modification method for multi-substrate encapsulation structures in high-voltage power supply devices, belonging to the field of material surface modification technology. This invention significantly enhances the interfacial bonding strength and electrical insulation performance between the encapsulation structure substrate and the silicone gel by plasma activation treatment of the substrate material, introducing oxygen-containing polar functional groups and constructing a nano- to micron-level rough structure. Compared to untreated materials, the adhesive strength of the treated encapsulation structure substrate can be increased by more than 50%, and the surface flashover voltage at an electrode spacing of 5-15 mm is not less than 20 kV. Using this invention, the interfacial bonding strength and surface withstand voltage performance of the multi-component heterogeneous materials and the encapsulating silicone gel can be significantly improved, solving the engineering challenge of integrated treatment of multi-component, cross-material encapsulation interfaces in high-voltage power supplies, and offering the advantage of easy online integration with existing vacuum encapsulation production lines.

The electronic gun comprises an anode, an insulation structure, a cathode supporting piece, a cathode cylinder, a cathode and a focusing electrode, the insulation structure is a conical multi-section insulation structure, the conical multi-section insulation structure comprises a plurality of conical ceramic sections, a metal sealing sheet is arranged between every two adjacent conical ceramic sections, and the metal sealing sheet is arranged between every two adjacent conical ceramic sections. One side, close to the vacuum sealing cavity, of the metal sealing sheet is bent to form an arc-shaped structure. Compared with the prior art, through the synergistic effect of the conical ceramic section and the inwards-bent metal sheet, a normal electric field component facing the surface of the insulator is constructed in vacuum near an insulator-vacuum interface, so that electrons emitted from an insulator-vacuum-metal combination point are far away from the surface of the insulator under the action of electric field force; and secondary electron multiplication caused by electron bombardment on the insulator is avoided, so that the surface flashover voltage is improved.

The application discloses a salt fog environment simulation system for insulator performance detection, and relates to the technical field of performance detection.The system comprises an environment simulation module, an evaluation monitoring module, an analysis processing module, a simulation prediction module and a safety protection module, and is applied to a closed environment.The technical points are as follows: the simulation prediction module can not only predict the future insulator fog flashover voltage, but also combine the lightning voltage estimation value and the resistance value as self factors, and combine the temperature, humidity and wind speed as environmental factors, so as to comprehensively obtain an insulator performance evaluation value Ipev which can directly reflect the insulator performance.By comparing the insulator performance evaluation value Ipev with an evaluation threshold value Vol, whether the insulator performance is abnormal can be known according to the comparison result, and the insulator with abnormal performance can be timely warned, so that the reliability and efficiency of the system in use are embodied.

The invention relates to the technical field of electrolyte, and discloses a high-voltage aluminum electrolytic capacitor which comprises a shell, an anode foil is fixedly connected to the left side of the upper end of the shell, a cathode foil is fixedly connected to the right side of the upper end of the shell, a contact opening is fixedly connected to the middle of the upper end of the shell, and a battery cell is fixedly connected to the middle of the lower end of the contact opening. A wrapping layer is arranged on the outer side of the battery core, and a film II is arranged in the middle of the outer side of the wrapping layer. When the electrolyte in the high-voltage aluminum electrolytic capacitor is used, personnel need to prevent external halogen from entering the interior, and at the moment, the personnel can add n-hexane and tetrahydrofuran into the interior, so that an internal gasket and an electrical core can be wrapped, the external halogen entering the interior can be reduced, and the service life of the high-voltage aluminum electrolytic capacitor is prolonged. The corrosion of the aluminum electrolytic capacitor can be reduced, and the conductivity of the electrolyte can be improved while the sparking voltage of the electrolyte is improved, so that the service life of the aluminum electrolytic capacitor is prolonged.

The invention relates to an embedded induction heating tempered glass insulator and a preparation method thereof, and relates to the technical field of insulators. An embedded induction heating tempered glass insulator comprises a functional layer structure which is sequentially compounded on the tempered glass insulator from inside to outside, the functional layer structure comprises an induction energy taking layer, a self-temperature-limiting heating layer, an insulation isolation layer and a tempered glass layer, and passive energy taking is achieved through a fractal grid structure formed by laser etching titanium foil; the self-temperature-limiting heating layer is electrically connected by clinging to the induction electrode layer, electric field induction is directly utilized to take energy for heating, the heating layer has spontaneous temperature regulation, and self-temperature-limiting heating is realized. Through the collaborative design of passive energy taking, self-temperature-limiting heating, insulation enhancement and structure optimization, self-heating ice prevention of the insulator can be achieved, the ice flashover voltage can be improved, the use requirements of complex and diversified lines are met, and safe and stable operation of a power grid is effectively guaranteed.

This invention discloses a flashover voltage booster, its preparation method, and applications, as well as an electrolyte for electrolytic capacitors. It relates to the technical field of electrolytes for high-voltage electrolytic capacitors. The preparation method includes: heating pure water to 93-97°C, adding boric acid and stirring to dissolve; adding ethyl silicate-40 dropwise at 80-90°C and reacting for 4-5 hours; adding methyltrimethoxysilane and stirring at 80-90°C for 1-1.5 hours; vacuum dehydrating at 78-82°C; adding ethylene glycol when the water content drops to 50%; further dehydrating until the water content is <3%; and cooling to obtain the flashover voltage booster. This invention utilizes the hydrolytic crosslinking of boric acid and ethyl silicate-40, end-capping with methyltrimethoxysilane to inhibit gelation and reduce viscosity, combined with staged dehydration and compatibility with ethylene glycol, to prepare a low-viscosity, highly compatible, and high-temperature stable borosilicate crosslinked booster. This significantly improves the flashover voltage and high-temperature stability of the electrolyte, with minimal impact on conductivity and ESR.