87 results about "Arc erosion" patented technology

The invention provides an insulating material surface arc ablation resistance simulation method based on magnetohydrodynamics, and belongs to the field of insulating material performance detection. The method comprises the following steps: establishing an insulating material surface arc ablation resistance model; constructing a magnetohydrodynamic control equation set; setting boundary conditions of the model; and iteratively solving the magnetohydrodynamic control equation set through finite element simulation software to obtain a temperature distribution diagram of the insulating material under different arc ablation times, and comparing the temperature distribution diagram with a TGA curve of the insulating material to judge the arc ablation resistance of the insulating material. According to the invention, the power-frequency alternating-current high-voltage arc and the insulating material are used as simulation objects, engineering practice is better met, the surface arc ablation resistance process of any insulating material can be simulated by changing the physical characteristic parameters of the insulating material, and the TGA curve of the material is introduced to judge the arc ablation resistance of the insulating material. And technical support is provided for high-voltage switch equipment insulating material type selection.

The invention discloses a high-entropy alloy particle reinforced copper-based contact material and a preparation method and application thereof, and belongs to the technical field of contact materials. The reinforced-phase high-entropy particles are added into the copper matrix to improve the ablation resistance of the contact material. Powder of five different elements is mixed, subjected to ball milling and annealed to obtain high-entropy alloy powder, then copper powder and the high-entropy powder are mixed and subjected to ball milling to obtain Cu-HEAs composite powder, and finally the high-entropy alloy reinforced copper-based contact material is obtained through the SPS hot pressing sintering technology. The Cu-HEAs contact material has excellent physical and mechanical properties, the arc erosion resistance of the copper-based contact material is enhanced, and the service life of a contact is prolonged.

The invention relates to the technical field of power equipment, in particular to a vacuum pole-mounted circuit breaker, which comprises a vacuum arc-extinguishing chamber and a mechanism box, a static contact and a moving contact are inserted in the vacuum arc-extinguishing chamber, and under the action of the mechanism box, the moving contact can be close to or far away from the static contact and can be conducted with the static contact; a conductive part is arranged between the static contact and the moving contact, the conductive part can generate elastic deformation, can be in stop fit with the static contact or the moving contact, and is configured to be conducted with the static contact and the moving contact before the static contact and the moving contact are conducted. Therefore, the problem of arc erosion between the static contact and the moving contact is effectively avoided in a mode of transferring an arc generation position, the bounce amplitude of the moving contact is reduced by utilizing the elastic deformation characteristic of the conductive part, the service life of the static contact and the moving contact can be ensured while the wear of the static contact and the moving contact is reduced, and the service life of the static contact and the moving contact is prolonged. And the conductivity between the static contact and the moving contact can be ensured.

The invention discloses high-voltage wiring harness connector terminal fretting wear test equipment which comprises an equipment base, a high-frequency vibration exciter and a lifting platform are mounted on the equipment base, and a mounting platform is arranged at the top of the lifting platform; a left test piece mounting loading mechanism and a right test piece mounting force measuring device are arranged on the mounting platform. The device can realize a multi-physics field coupling test, current-carrying friction and arc erosion of an electric contact surface in a real working condition are simulated by combining a current load with high-frequency mechanical wear, and the electric-mechanical coupling wear characteristic of a new energy automobile charging terminal is accurately reproduced. The device supports the dynamic adjustment of normal load, simulates the contact pressure change of the left and right test samples of the test terminal in the plugging process through the test sample pin and the test sample jack, can be used for researching the relevance between the fretting wear and the contact resistance of the test terminal under different loads, and realizes the test of the terminal under complex working conditions in a laboratory environment. The test process is convenient, efficient and accurate, and the test cost and the test period are greatly reduced.

The invention discloses a silver-based tin oxide electric contact material and a preparation method thereof, and relates to the technical field of electric contact materials. When the silver-based tin oxide electric contact material is prepared, firstly, a high-temperature solid-phase method is used for doping lithium and cerium to prepare doped tin oxide powder; stannic chloride and copper nitrate are prepared into a fiber membrane through electrostatic spinning, meanwhile, titanium dioxide is grown in situ through nano spraying, and doped stannic oxide fibers are prepared after calcination; the doped tin oxide powder, doped tin oxide fibers and silver powder are subjected to high-energy ball milling and powder mixing and then annealed, and silver-based tin oxide composite powder is obtained; the silver-based tin oxide composite powder is subjected to pre-pressing forming and then subjected to vacuum discharge plasma sintering, and the silver-based tin oxide electric contact material is prepared. The prepared silver-based tin oxide electric contact material has the advantages of being low in resistivity, high in fusion welding resistance, good in arc erosion resistance and easy to machine and shape.

The invention discloses a copper-silver alloy and a preparation method thereof.The preparation method comprises the following steps that silver alloying is conducted, specifically, a silver raw material and rare earth elements are added into a vacuum induction furnace to be mixed, and a silver alloy melt is obtained after heating and melting are conducted in the vacuum atmosphere; copper alloying is conducted, specifically, electrolytic copper is added into a non-vacuum induction furnace to be smelted, phosphorus and rare earth elements are added for alloying after heating melting, and a copper alloy melt is obtained; horizontal continuous casting: respectively carrying out horizontal continuous casting on the silver alloy melt and the copper alloy melt to obtain a silver alloy plate and a copper alloy plate; the multiple layers of silver alloy plates and the multiple layers of copper alloy plates are alternately stacked in a silver-copper-silver-... mode and placed in hot extrusion equipment to be subjected to hot extrusion, and a composite plate is formed; and cold drawing is conducted, specifically, the composite board is subjected to cold drawing to obtain the copper-silver alloy, the copper-silver alloy can be used as an electric contact material, the preparation method is low in cost, and the prepared copper-silver alloy has high conductivity, high hardness and arc erosion resistance.

The invention relates to the technical field of circuit breakers, in particular to a capacitor electricity taking type deep fusion pole-mounted circuit breaker. The invention relates to a capacitor power-taking type deep fusion pole-mounted circuit breaker, which comprises a plurality of power-off mechanisms. Each power-off mechanism comprises an outer layer cover, a fixed terminal, a movable terminal and an adjusting assembly. The adjusting assembly comprises an upper current-conducting plate, a lower current-conducting plate and two adjusting units. Each adjusting unit comprises a contact box. When the moving terminal collides with the lower conductive plate, bounce in the vertical direction can be generated, the elasticity of the contact box is matched with the movement of the moving terminal, so that the lower conductive plate and the moving terminal can be always contacted, the relative movement between the moving terminal and the lower conductive plate is reduced, and the number of times of arc erosion on the moving terminal is reduced. The invention provides a capacitor electricity taking type deep fusion pole-mounted circuit breaker, and aims to solve the problem that a movable contact and a fixed contact are damaged due to the fact that a large amount of electric arcs are generated when the movable contact and the fixed contact of an existing circuit breaker are in contact.

The invention relates to a preparation method of a carbon nanotube reinforced copper-based electrical contact composite material, and belongs to the technical field of electrical contact preparation. The preparation method comprises the following steps: filling a mold with mixed powder of reinforcement powder, copper powder and chromium powder, carrying out hot pressed sintering, solidifying the powder to form a CNTs / Cu-Cr composite material block, and carrying out extrusion deformation treatment on the CNTs / Cu-Cr composite material block at 800-900 DEG C to complete the preparation of the reinforced copper-based electrical contact composite material based on the carbon nanotubes. The preparation method disclosed by the invention is simple to operate, stable in preparation process, short in preparation period and high in practicability, and the prepared composite material not only has excellent arc erosion resistance, but also has good mechanical properties and electrical conductivity, meets the requirement of long service life of an electrical contact, and has a good application prospect in the field of power electronic materials.

The invention relates to the technical field of high-voltage electric power, and particularly discloses a high-voltage electric mechanical part wear state evaluation method and system.The method comprises the steps that multi-sensor time sequence signals, operation overshoot mechanical kinetic energy and contact surface temperature are collected, a normalized wear signal sequence is obtained through kinetic energy compensation, and multi-dimensional features are extracted; a comprehensive feature vector is generated through lightweight attention mechanism fusion, a thermal coupling factor correction wear mode is calculated based on temperature, a real-time state and lubrication dielectric characteristics are fused to obtain an evaluation aggressive coefficient, levels are mapped, and the arc erosion cumulant after environment correction is combined to obtain a high-precision arc erosion model. And generating an evaluation report of the content index, the composite fault and the residual life. According to the method, accurate decoupling of a concurrent wear mode and self-adaption of an evaluation strategy working condition can be realized, evaluation precision and embedded deployment requirements are considered, the problems of rough evaluation, neglect of multi-factor coupling and poor adaptability in the prior art are effectively solved, and reliable support is provided for predictive maintenance of high-voltage electric mechanical parts.

The invention discloses a copper-chromium contact material with an ordered 3D microstructure and a preparation method. The copper-chromium contact material comprises a copper matrix phase and a chromium second phase, the second chromium phase is changed into a skeleton structure in spatial ordered directional arrangement from traditional dispersed distribution, and the copper matrix phase is filled in the chromium skeleton structure and is distributed in a through ordered network structure; the CuCr contact of the ordered structure enables internal current to flow orderly and directionally, so that a magnetic field structure of the ordered structure is generated on the surface of the contact in situ, an effect of restraining or accelerating movement of an electric arc generated in a breaking process is achieved, meanwhile, the ordered three-dimensional Cr framework can keep the structure stable when the surface of the contact is melted, and the contact surface is prevented from being damaged. The problem that the contact resistance is increased due to the fact that Cr particles are segregated towards the surface layer after arcing is solved. When the copper-chromium contact material is used as a medium-high voltage switch contact, the current breaking and arc erosion resistance of the CuCr contact material can be improved.

The present application discloses a copper-silver alloy and a preparation method thereof, which comprises the following steps: silver alloying: adding a silver raw material and a rare earth element into a vacuum induction furnace for mixing, heating and melting in a vacuum atmosphere to obtain a silver alloy melt; copper alloying: adding electrolytic copper into a non-vacuum induction furnace for smelting, heating and melting, and then adding phosphorus and rare earth elements for alloying to obtain a copper alloy melt; horizontal continuous casting: horizontally continuous casting the above-mentioned silver alloy melt and copper alloy melt respectively to obtain silver and copper alloy plates; hot extrusion molding: alternately stacking multiple layers of silver alloy plates and copper alloy plates in a "silver-copper-silver-..." manner, placing them in a hot extrusion device for hot extrusion to form a composite plate; cold drawing: cold drawing the composite plate into a material to obtain a copper-silver alloy, which can be used as an electrical contact material. The preparation method is low in cost, and the obtained copper-silver alloy has high conductivity, high hardness and resistance to arc erosion.

The utility model relates to a frame edge type socket with an arc discharge prevention structure. A socket body internally comprises a wire inlet end and a wire inlet elastic contact piece, and the wire inlet elastic contact piece is connected with the wire inlet end through a wire inlet end wiring board; comprising a wire outlet end and a wire outlet elastic contact piece, and the wire outlet elastic contact piece is connected with the wire outlet end through a wire outlet end wiring board. An anti-arcing structure is arranged between the wire inlet end and the wire outlet end in the socket body, the anti-arcing structure comprises a left part and a right part, an insulating partition plate is arranged between the left part and the right part of the anti-arcing structure, and the left part and the right part of the anti-arcing structure are symmetrically arranged relative to the insulating partition plate. An arc discharge prevention mechanism is additionally arranged in the socket, an arc striking sheet of the arc discharge prevention mechanism leads out electric arcs generated by a wire inlet elastic contact sheet and a wire outlet elastic contact sheet through a wire inlet terminal wiring board and a wire outlet terminal wiring board, the electric arcs are prevented from corroding a conductive seat sheet, the led-out electric arcs are guided into the arc extinguishing mechanism by the arc striking sheet, and the arc extinguishing mechanism weakens the electric arcs through a J-shaped track. And the electric arc loses potential energy in the climbing process until being extinguished.

The invention belongs to the technical field of electrical contact preparation, and particularly relates to an electrical contact for improving the reliability of a direct-current relay and a preparation method. According to the prepared contact material, the 3D printing technology is adopted, partition design is carried out on materials of different parts, and a working layer still keeps a CuTe0.3 material with excellent arc erosion resistance and welding resistance; the connecting layer is made of CuW or CuWC, and the material has extremely high hardness, so that the connecting layer can bear high load and abrasion of a connecting structure, and the performance of long-term stable connection is ensured; the conduction layer is made of pure silver, silver has excellent flow guide performance, all parts are effectively combined through the conductive adhesive to form a whole, contact resistance can be effectively reduced, contact heating is reduced, and therefore energy consumption is reduced.

This invention provides a weldable, lightweight, long-life arc-initiating electrode and welding method, including an anode head, a cathode head, an anode column, and a cathode column. The anode head and cathode head are made of single or composite metal conductor materials resistant to arc erosion; the anode column and cathode column are also made of single or composite metal conductor materials. The current path is as follows: the arc igniter is connected to both ends of the track in the muzzle region of a high-speed electromagnetic propulsion device, powered by an external power source. Current flows through the track and armature path of the high-speed electromagnetic propulsion device. The armature, under electromagnetic force, accelerates and slides from the muzzle towards the muzzle. When the armature exits the muzzle, it disengages from the track. Simultaneously, the metal or plasma medium in the gap between the bypass electrodes of the arc igniter induces gap breakdown discharge, achieving arc initiation. This invention meets requirements for conductivity and high tensile strength.

This invention provides a method for preparing nickel-silver-tungsten composite electrical contact materials, the electrical contact materials themselves, and electrical contacts. The method involves chemically plating silver and nickel metal nanoparticles onto the surface of tungsten powder in a layered manner, resulting in tungsten powder with a tightly packed core-shell structure of silver-nickel bimetallic layers. Then, different mass fractions of the core-shell tungsten powder and silver powder are uniformly mixed using solution ball milling. Finally, the mixed powder is crystallized and solidified using electro-spark plasma sintering technology to obtain a series of nickel-silver-tungsten composite electrical contact materials. The nickel-silver-tungsten composite electrical contact materials provided by this invention exhibit good compressive strength, excellent ductility, and superior resistance to arc erosion.

The invention belongs to the technical field of nickel-doped silver-based electric contact materials, and particularly relates to an AgTiC-Ni electric contact material and a preparation method thereof. The method comprises the following steps: (1) adding TiC powder into a nickel-containing chemical plating solution, carrying out stirring and heating reaction, and washing and drying to obtain TiC-coated Ni composite powder; (2) Ag powder and the TiC-coated Ni composite powder are added into a container, a solvent is added, ultrasonic mixing is conducted, and a mixture is obtained after drying; (3) pressing the mixed material into a blank, sintering for the first time in an inert atmosphere, and cooling to room temperature after sintering to obtain a prefabricated material; and (4) carrying out compression molding on the prefabricated material again, carrying out secondary sintering in an inert atmosphere, and cooling to room temperature after sintering to obtain the AgTiC-coated Ni electric contact material. According to the method, Ni is more uniformly distributed in AgTiC through chemical nickel plating, the conductivity and the hardness of the AgTiC-Ni electric contact material are remarkably improved, the arcing time and the arcing energy of arc erosion are more stable, the material transfer amount is minimum, and the material loss is less.

The invention discloses an Ag-SnO2 contact material and a preparation method thereof, and belongs to the field of electric contact materials. According to the material, the wettability of Ag and SnO2 is improved by adding Ag2MoO4 powder, and the problem of contact resistance increase caused by segregation of SnO2 in a molten pool in the prior art is solved. The preparation method comprises the steps of powder mixing, pressing and sintering, wherein 4-8 wt% of SnO2 powder, 0.5-3 wt% of Ag2MoO4 powder and the balance Ag powder are mixed in the protective atmosphere according to the mass percent, and the particle size of the powder is-300 meshes; a pre-sintered material is formed through two-step pressing including the initial pressure of 0.95-1.05 GPa and the re-pressing pressure of 450-550 MPa; and then under the condition that the vacuum degree is not lower than 6.67 * 10 <-2 > Pa, the temperature is increased to 900-920 DEG C at the speed of 8-12 DEG C / s, and sintering is conducted for 2-4 hours. The low-melting-point characteristic of Ag2MoO4 can coat SnO2 particles in the sintering process, the segregation behavior of SnO2 in a molten pool during service is inhibited, the fusion welding frequency and mass loss are reduced, and the arc erosion resistance is improved. The method has the advantages of being low in equipment requirement, easy and convenient to operate and controllable in cost, and the prepared contact material shows excellent service stability in the low-voltage electrical field.

The invention discloses a copper-chromium contact surface laser remelting rotating device. The copper-chromium contact surface laser remelting rotating device comprises a working table, a rotating clamping table, an adjusting assembly and a laser, wherein the rotating clamping table and the adjusting assembly are arranged on the working table; the rotary clamping table comprises a mounting seat, a rotary seat rotationally clamped on the mounting seat, a movable clamping block arranged on the rotary seat and a rotary motor for providing power for the rotary seat; the adjusting assembly comprises a first arc-shaped frame and an adjusting seat; the laser is arranged on the lower bottom surface of the adjusting seat; the device is reasonable in structural design, the laser is arranged on the adjusting seat capable of freely moving along the first arc-shaped frame, so that the laser can be matched with the curved surface radian of the R chamfer of the copper-based contact, it is ensured that a laser beam can'follow 'each point of the chamfer surface, the machining blind area of the curved surface radian in the circumferential direction is completely eliminated, and the machining efficiency is improved. The microstructure of a copper-chromium alloy remelting layer is refined, alloy elements are distributed more evenly, and the hardness, abrasion resistance, arc erosion resistance and other performance of the surface of the copper-chromium contact are remarkably improved.

The invention discloses a silver-tungsten composite electric contact material and a preparation method and application thereof. The silver-tungsten composite contact material is obtained by directly curing nano tungsten-silver powder with a core-shell structure at high temperature through an electric spark plasma sintering technology, wherein the silver-tungsten composite contact material is composed of nanoscale tungsten and silver particles; the preparation method comprises the following steps: introducing a silver nanoparticle metal shell layer on the surface of a nano tungsten particle through a two-step chemical plating means to obtain nano tungsten-silver powder, and then directly curing the nano tungsten-silver powder at high temperature by adopting an electric spark plasma sintering technology under a vacuum condition. The silver-tungsten composite contact material provided by the invention has excellent physical properties and excellent arc erosion resistance, and has a uniform and compact microstructure.

The invention discloses an Ag-SnO2 contact material with a tin oxide framework as a matrix and a preparation method and application of the Ag-SnO2 contact material, and belongs to the technical field of contact materials. A tin oxide skeleton is used as a matrix, a metal silver material is added as a reinforcement, the metal silver material is infiltrated into the tin oxide skeleton, and the Ag-SnO2 contact material is prepared through SPS. The invention has the advantages of wear resistance, good welding resistance, good conductivity, low contact resistance and low temperature rise, the special organization structure can inhibit the enrichment of SnO2 on the surface of the contact material in the arc erosion process, the arc erosion resistance is improved, the service life is prolonged, and the service life of the contact material is prolonged. The problem that an Ag-SnO2 contact material prepared through a traditional method is poor in arc erosion resistance is fundamentally solved. The contact material is excellent in comprehensive performance and has wide development and application prospects.

An operating mechanism for a transfer switch, the operating mechanism comprising a bracket and an energy storage mechanism for driving a main shaft. The energy storage mechanism comprises a first energy storage mechanism, a second energy storage mechanism, and a turnover member. When the turnover member rotates, a corresponding connecting rod shaft is driven by means of one of side walls at two ends of a first arc-shaped sliding groove or a second arc-shaped sliding groove to drive a connecting rod mechanism of the first energy storage mechanism or the second energy storage mechanism to move, such that a corresponding energy storage spring first stores energy and releases the energy after passing a balance position so as to drive the connecting rod mechanism to drive the main shaft to rotate, and the connecting rod shaft slides to the other ends of the first arc-shaped sliding groove and the second arc-shaped sliding groove. In this way, during the energy storage process of the energy storage mechanisms, the main shaft does not move, and after the energy storage mechanisms release the energy, the main shaft is driven to quickly rotate and switch a power supply. The switching speed of an automatic transfer switch is independent of the speed of a manual operation mechanism and an automatic operation mechanism, and the automatic transfer switch can reduce arc erosion on a switch contact system.

This invention discloses a method for preparing a stationary contact, comprising: melting pure copper at high temperature and casting it into a mold to form a ring-shaped blank, wherein the blank has multiple mounting holes spaced apart circumferentially; grinding the inner surface of the blank using a grinding mechanism; cleaning the inner surface of the blank; forming a conductive layer on the inner surface of the blank, wherein the conductive layer is made of copper-tungsten alloy material and formed by high-temperature sintering using powder metallurgy technology; and grinding the mounting holes and the end face of the blank. The stationary contact obtained by the above method has improved strength, is resistant to arc erosion, and has an extended service life.

This application discloses a method for preparing silver-tin oxide electrical contact material for magnetic latching relays, comprising the following steps: depositing indium oxide and tin oxide sequentially on the surface of silver powder by physical vapor deposition to obtain a coated powder, wherein the indium oxide content is 0.3~0.8wt%, the tin oxide content is 8~10wt%, and the balance is silver; mixing the coated powder, yttrium-stabilized tetragonal zirconium oxide, and trace additives to obtain a composite powder, wherein the trace additives are copper oxide or tungsten oxide, and the mass ratio of yttrium-stabilized tetragonal zirconium oxide to coated powder is (2~5):100; hot pressing the composite powder at 25~35MPa to obtain a blank, and holding it at that temperature for 1~2h; hot extrusion processing to process the blank into a rod; multi-pass drawing to produce a wire, and performing intermediate annealing treatment during the drawing process, with each annealing time being 1~2h. The electrical contact prepared by this method has high contact resistance stability and arc erosion resistance.

According to the electronic switch used for controlling the slot control motor, one end of a box body is provided with a main power supply input end, the other end of the box body is provided with a main power supply output end, a U-phase power supply, a V-phase power supply and a W-phase power supply in the main power supply input end are respectively connected with a main loop, and meanwhile, safety devices are arranged on the U-phase power supply and the V-phase power supply; the main loop is provided with four alternating current reversing switches used for being connected with a slot control motor, the main loop is connected with a voltage detector and a current detector, the voltage detector and the current detector are respectively connected with a data processor, the data processor is connected with a controller, and the controller is connected with an optoelectronic isolator, a state indicating lamp, a thyristor and a control input end. The invention has the characteristics of long service life, large controllable power, small volume and no mechanical wear and arc corrosion risk.

The invention belongs to the technical field of composite material preparation, and particularly relates to a tungsten infiltrated copper composite material and a preparation method thereof. According to the invention, through a multi-scale through pore network formed by'prefabricated material construction ', molten copper liquid can be rapidly filled along a large pore channel and fully permeates into the tail end of a small pore, so that the defect of'black core' generated by closed pores is thoroughly avoided. According to the prepared composite material, the tungsten phase and the copper phase respectively form a stable and communicated three-dimensional network, so that the unification of high conductivity (greater than or equal to 60% IACS), high strength and toughness (hardness greater than or equal to 100 HB) and excellent arc ablation resistance is fundamentally and synergistically realized, and the long-standing limitation of'impossible performance triangle 'is effectively broken through. And the process is high in integration level, green and remarkable in strengthening effect, and process simplification, environmental protection strengthening and performance improvement are achieved at one stroke. The advantages of raw materials and process cost are outstanding, the industrialization prospect is wide, and the relationship among high performance, designability and mass productivity is perfectly balanced.

The invention provides a normally open auxiliary contact of an electronic contactor. The normally open auxiliary contact comprises a printed board, a displacement sensor and an input and output port are installed on the printed board, a control circuit is arranged and connected with the input and output port and the displacement sensor, a through hole is machined in the control circuit and located below the displacement sensor, one end of a transmission rod extends into the displacement sensor from the through hole, and the other end of the transmission rod extends into the displacement sensor. The other end of the transmission rod is connected with and synchronously moves with the main contact system; according to the invention, the auxiliary contact function is realized through the semiconductor power device, and the problems of arc ablation and environmental pollution when the contact is electrified to be switched on and switched off are avoided.

The invention discloses an aircraft gravity filler cap with electric lap joint and lightning protection functions, and belongs to the technical field of aircraft gravity refueling. The aircraft gravity filler cap with the electric lap joint and lightning protection functions comprises a filler cap seat, an upper cover assembly and a lower cover; the upper cover assembly is provided with a conductive piece making contact with the covering cap base. The lower cover is made of a high dielectric strength material; the metal base and the covering cap seat are in electric lap joint through the conductive part, when the whole aircraft gravity filler cap is struck by lightning, the conductive part conducts electric charges to the covering cap seat and the outer wall of an oil tank, and therefore the sealing face of the covering cap seat is prevented from being ablated by high-voltage electric arcs when the aircraft gravity filler cap is struck by lightning, and personnel and equipment are prevented from being damaged by residual electric charges. The lower cover is located in the oil tank and is made of high dielectric strength materials, electric fire is prevented from occurring in the oil tank of the gravity oil filler cover under the direct thunder and lightning action, and the problems that a traditional gravity oil filler cover does not have good electric lap joint performance, and a sealing face of a cover seat is ablated by high-voltage arcs when the traditional gravity oil filler cover is subjected to the thunder and lightning are solved.

The invention provides a preparation method of an AgSnO2In2O3Bi2O3 electric contact material. The preparation method comprises the following steps: providing AgSnIn alloy powder and AgSnBi alloy powder; the AgSnIn alloy powder and the AgSnBi alloy powder are subjected to oxidation treatment, and AgSnO2In2O3 powder and AgSnO2Bi2O3 powder are formed; the preparation method comprises the following steps: mixing AgSnO2In2O3 powder, AgSnO2Bi2O3 powder, an additive I and silver powder; performing multi-mold pressing; continuously sintering; carrying out secondary forming and pressing; and carrying out heat treatment to obtain the AgSnO2In2O3Bi2O3 electric contact material. According to the invention, ternary oxide composite reinforcement is adopted, and modes of secondary pressing and the like are combined, so that reinforcement phase segregation and reinforcement phase distribution uniformity are improved, and the interface bonding strength, the material density and the arc erosion resistance of the electric contact material are effectively improved; and the production efficiency of the electric contact material is effectively improved, the processing method is simple, and the yield is high.

The invention discloses a conductive reinforced phase material and an in-situ preparation method thereof, and belongs to the technical field of core electric contact materials for switches. The reinforced phase material is Ti3AlC2-coated Al2O3 and is composed of an inner layer and an outer layer in the coaxial direction, the inner layer is of a hollow cylindrical structure, the component of the inner layer is Ti3AlC2, and the outer layer is an Al2O3 coating layer generated on the surface of the inner layer in situ. The in-situ preparation method comprises the following steps: by taking a carbon nanotube as a template and eutectic molten salt as a carrier, preparing the conductive reinforced phase material with the double-layer concentric cylindrical composite structure through vacuum freeze drying, molten salt shielding reaction and high-temperature and high-pressure oxidation treatment. Compared with an original MAX-phase powder reinforced metal-based electric contact composite material and a commercial metal-based electric contact composite material, the novel material is compounded with conductive metal powder such as silver and copper, the electric conduction and heat conduction performance and the arc erosion resistance of the electric contact composite material can be remarkably enhanced, and the potential of replacing a traditional electric contact material is huge.

The invention discloses a magnetic blow-out arc extinguishing structure of a GIS circuit breaker. The magnetic blow-out arc extinguishing structure comprises an arc moving contact, a magnetic blow-out coil, an arc static contact, a main moving contact and a main static contact, the main contact group and the arc contact group are respectively connected with corresponding electrodes, and current is conducted only through the main contact group during normal through-flow; the magnetic blow-out coil is poured in an insulating mode through epoxy resin and independently arranged on the outer side of the arc contact, a safe distance is kept between the magnetic blow-out coil and the arc contact to avoid arc ablation, and meanwhile the magnetic blow-out strength is regulated and controlled through an external pre-charging capacitor. When a short-circuit fault occurs, the main contact is firstly separated to transfer current to the arc contact group, after the arc contact is separated to generate an electric arc, the pre-charging capacitor discharges to the magnetic blow-out coil to generate pulse strong magnetism, the electric arc is driven to directionally extend and intensified convective heat exchange with SF6 gas, and rapid arc extinguishing is realized by combining the synergistic effect of gas blow-out and magnetic blow-out. The device is suitable for GIS systems with different voltage levels of 110 kV to 550 kV, the arc extinguishing response speed is high, the magnetic blow-out strength is adjustable, and the short-circuit fault breaking reliability of a high-voltage system is remarkably improved.