233results about How to "Improve the withstand voltage level" patented technology

The invention discloses an electrical-thermal aging test device of cable accessories under high voltage and high current. The electrical-thermal aging test device is characterized by comprising the following four functional parts: a high-voltage generation unit (1), a test loop unit (2), a high-current generation unit (3) and a signal measurement unit (4). The high-voltage generation unit (1) is connected with the test loop unit (2) so as to introduce the high voltage to a test loop; the test loop unit (2) passes through the high-current generation unit (3) to form a magnetic field couple and generate the high current, and when the aging test is performed, the high-voltage generation unit and the high-current generation unit work at the same time to realize the purpose of applying the high voltage and the high current in the test loop unit; and the signal measurement unit (4) is installed in the test loop unit (2), so that the isolation aging state detection of the cable accessories can be realized through collecting the electrical characteristic parameters which are used for detecting the partial discharge of the sample cable accessories.

The invention discloses a vacuum circuit breaker based on a T-shaped double break vacuum arc-extinguishing chamber, which can effectively reduce the cost, improves the voltage withstanding level of a single arc-extinguishing chamber, is easy to be in series connection to form an ultrahigh-voltage and superhigh-voltage vacuum circuit breaker. The vacuum circuit breaker comprises a vacuum arc-extinguishing chamber, an insulated ceramic column, an operating mechanism and a control case, a control signal input end is arranged on the control case, the insulated ceramic column is internally provided with an insulated connection rod which is connected with the operating mechanism, the upper end of the insulated connection rod is connected with a movable conducting rod in a guiding sleeve, the upper end of the movable conducting rod is connected with a movable contact connecting board which is arranged in the vacuum arc-extinguishing chamber, the transverse left end and the transverse right end of the movable contact connecting plate are respectively and correspondingly provided with a left movable contact and a right movable contact, a left static contact and a right static contact are correspondingly and fixedly arranged on the left movable contact and the right movable contact, the left static contact is connected with an incoming line, the right static contact is connected with an outgoing line, and bushings are sleeved on the incoming line and the outgoing line.

This invention provides one transducer paint enamel wire production method, which uses copper bar as materials to process the enamel wire through pressing and shaping and painting or product processing, wherein, the production adopts pressing pushing feeding and wheel groove friction pressing with temperature through module hole pressing to form once shaping process to substitute the traditional process. The process saves the annealing step and comprises the steps: copper transmission correction; pressing by one time and cooling anti-oxidation; soft bare wire receiving wires; painting and drying wires; paint baking; product receiving line.

The invention relates to an organosilane crosslinked polyethylene insulation material for 20kV cables and a preparation method thereof. The insulation material comprises a material A, a material B and a material C, wherein the material A comprises the following components in parts by weight: 100 parts of polyethylene, 0.01-1 part of initiator, 0.2-5 parts of silane crosslinking agent and 0.01-0.5 part of antioxidant; the material B comprises the following components in parts by weight: 100 parts of polyethylene, 0.5-5 parts of catalyst, 1-30 parts of catalyst promoter and 0.1-0.5 part of antioxidant; and the material C comprises the following components in parts by weight: 100 parts of ethylene-octylene copolymer, 0.01-5 parts of processing aid and 0.2-5 parts of metal ion inhibitor. The preparation method comprises the following steps of: (1) respectively extracting the raw materials of the material A, the material B and the material C and then feeding into an extruder for mixing and pelletizing to obtain three types of granule materials; (2) extracting the three types of granule materials based on a proportion of 100:4-7:2-6 and then fully mixing; and (3) feeding the mixed materials into the extruder for extruding to obtain a finished product. The preparation method has high hydrolysis cross-linking speed, flexible processing technology and simple operation. The insulation material has high voltage withstanding grade and long service life.

The invention discloses a vertical double-diffusion metal oxide semiconductor field effect transistor (MOSFET), which comprises a metallization drain 1, an N<+> substrate 2, an N<-> drift region 3, a deep P body region 5, an N type heavy doping source region 6, a P type heavy doping region 7, an N type buried layer channel 8, a P type epitaxial layer 9, a gate oxidation layer 10, a polysilicon gate electrode 11 and a metallization source 12. When the vertical double-diffusion MOSFET is switched on, the switch-on resistance of a device is greatly reduced through the common electricity conducting mechanism of two channels; and when the vertical double-diffusion MOSFET is switched off, electric fields of the channels are shielded through a P+N junction barrier, so that a higher voltage-resisting level of more than 1,000V is realized.

The invention provides a diagnosis system and method for an electric vehicle battery pack insulation resistance detection circuit. According to the diagnosis system and method, a first known measuringresistor and a third known measuring resistor are connected in parallel with the insulation resistor of the positive pole terminal of a battery pack; a second known measuring resistor and a fourth known measuring resistor are connected in parallel with the insulation resistor of the negative pole terminal of the battery pack; a first switch is connected in series with the first known measuring resistor; a second switch is connected in series with the second known measuring resistor; a third switch is connected in series with the third known measuring resistor; a fourth switch is connected inseries with the fourth known measuring resistor; a fifth known measuring resistor is connected in parallel with the insulation resistor of the positive pole terminal of the battery pack; a fifth switch is connected in series with the fifth known measuring resistor; a sixth known measuring resistor is connected in parallel with the insulation resistor of the negative pole terminal of the battery pack; and a sixth switch is connected in series with the sixth known measuring resistor. The diagnosis system and method of the invention can perform diagnosis when the insulation detection circuit fails, and can improve the reliability of insulation data.

The invention discloses a unit by-path apparatus for a unit cascade high voltage frequency converter, and control method thereof, wherein a by-path centralized control board being connected with a main circuit control board and an isolation transformer separately; the other end of the isolation transformer being connected with a by-pass contactor which is connected with an unit output. The by-pass apparatus is composed of a main circuit control board, a by-path centralized control board, an isolation transformer, and a by-path contactor. The method includes the steps of transferring a unit fault signal to the main circuit control board firstly; cutting off the main circuit current; thirdly, the by-path centralized control board transmitting a by-path contactor motion completion signal to the main circuit control board; fourthly, the main circuit control board transmitting IGBT control signal based on the acquisition motor backemf. The apparatus of the invention has a simple structure, and can cut off the failure unit by path completely reliably, eliminate the error and refused onstate of other type by-pass systems, and assure the safe and reliable motion of the whole by-pass method.

The invention discloses a three-layer co-extrusion PVC-M tubular product for coal mine, characterized in that the tubular product comprises an antistatic inner layer, an antistatic outer layer and a PVC-M interlayer, wherein the antistatic inner and outer layer compositions comprise the following ingredients: 100 weight parts of PVC resin, 0.8-1.2 weight parts of heat stabilizer, 4-8 weight parts of toughening agent, 1.3-2.0 weight parts of lubricating agent, 5-10 weight parts of flow modifier, and 6 weight parts of nano conductive carbon black; the PVC-M interlayer composition comprises the following ingredients: 100 weight parts of PVC resin, 1.0-1.5 weight parts of heat stabilizer, 10-15 weight parts of toughening agent, 2.1-3.5 weight parts of lubricating agent, and 0-5 weight parts of filling agent. According to the invention, the composition of the tubular product has high strength, the shock resistance of the tubular product can be comparable to that of polyethylene antistatic tubular products for coal mine, the modulus reaches to 2231MPa, the tensile strength reaches to 46.3Mpa, the impact strength of the simple-supported beam reaches to 97.6Mpa, the mechanical property shows toughness and balance and permanent antistatic property, thus the requirements of the tubular product for coal mine are satisfied.

The invention discloses a composite insulated sleeve, which comprises a conductive rod, an insulated core, an insulated umbrella, a sealing ring, an equalizing sleeve and a wiring nut, and is characterized in that: continuous annular grooves are formed on outside diameter surface of the conductive rod with in a length L covered by the insulated umbrella; and the insulated core is looped on at least a section with a length of more than or equal to 0.4 L and the insulated umbrella is compounded outside the insulated core. The method for manufacturing the composite insulated sleeve mainly comprises the following technical steps: 1, processing the conductive rod and performing the antioxidative processing of the conductive rod; 2, manufacturing a composite member in which the insulated core is looped on the conductive rod; 3, drying the composite member; 4, plasticizing the insulated umbrella; and 5, assembling the composite insulated sleeve. The composite insulated sleeve is applicable to American box transformers and is particularly applicable to external cables of wind power generation American box transformers.

The invention relates to insulating crosslinking polyethylene for a winding cable, which is characterized by comprising the following components by weight portion: 100 portions of low density polyethylene (LDPE), 35 to 55 portions of ethylene-vinyl acetate copolymer (EVA), 30 to 45 portions of polyisobutylene (PISOB) or butyl rubber (iiR), and 1.5 to 2.2 portions of peroxide cross-linking agent; and the insulating crosslinking polyethylene is prepared from the components through crosslinking. The insulating crosslinking polyethylene not only keeps the excellent electric property of the crosslinking polyethylene, in particular to the low electric loss of the crosslinking polyethylene, but also improves the softness of the crosslinking polyethylene, can satisfy the requirements on winding and inserting the winding cable, and improves the low temperature resistance of an insulating material. The insulating crosslinking polyethylene is not cracked by low-temperature impact at a temperature of 50 DEG C below zero in a test, can satisfy the mounting of cables in an environment at a temperature of not less than 25 DEG C below zero, and has the bending times of more than 1,000 to 1,100 times (according to the test condition of GB / T12706.2-2002), thus the insulating crosslinking polyethylene is particularly suitable for the insulation of winding wires of a high-voltage motor or a transformer for wind power generation and hydroelectric power generation.

The invention discloses a method for manufacturing a cable branch joint, belonging to the field of electrical engineering. The production method comprises the steps of stripping end parts of a main cable and a branch cable to be connected, sleeving an inner layer heat shrinkable tube, a copper woven net sleeve and an outer layer heat shrinkable tube in the main cable, using a copper tube to connect a wire core of the main cable and a wire core of the branch cable, orderly winding an insulation self-adhesive tape, a Teflon film, a cable filling tape and a sealing tape on the copper tube, moving the inner layer heat shrinkable tube, heating the inner layer heat shrinkable tube such that the inner layer heat shrinkable tube shrinks, moving the copper woven net sleeve, fastening the copper woven net sleeve, moving the outer layer heat shrinkable tube, and heating the outer layer heat shrinkable tube such that the outer layer heat shrinkable tube shrinks. Thus the connection part of the main cable and the branch cable is protected, the security is improved further, the manufacture is convenient, the size of the branch joint is small, the installation is convenient, the security is high, and the method is especially suitable for manufacturing branch joints of 1KV to 10KV high voltage cables.

Provided is a high-voltage transmission convertor station overvoltage protection device. By connecting a protection circuit to an AC side serial-connection protection circuit and a thyristor valve bank in parallel, the damage caused by overvoltage in a transmission line is restrained, the energy produced by faults in the transmission line at the front stage and the rear stage of a convertor station is rapidly absorbed, the normal running of the transmission line is protected, and fault ride-through is achieved.

The invention discloses a high-pressure gear pump floating side plate with a pressing plate, belonging to the technical field of high-pressure gear pumps. A W-shaped balance groove and an unloading groove are formed in one side of the floating side plate, a W-shaped sealing groove is formed in the other side of the floating side plate, a W-shaped reinforcing rib is arranged in the W-shaped sealing groove, a through hole is formed between the W-shaped sealing groove and the unloading groove, a W-shaped sealing ring is arranged in the W-shaped sealing groove, the thickness of the W-shaped reinforcing rib is less than the depth of the W-shaped sealing groove, a W-shaped pressing plate is arranged on the W-shaped sealing groove, and a W-shaped shallow slot is formed in the inner side of the W-shaped pressing plate. The W-shaped sealing ring can be well pressed by a region around the W-shaped shallow slot to ensure that a sealing effect of three end faces of the W-shaped sealing ring is well improved, the leakage of the floating side plate and the end face of a gear is effectively controlled, and the pressure resistance level of a hydraulic gear pump is increased.

The invention discloses a scribing method of a power chip and a semiconductor device. The scribing method includes following steps: forming scribing grooves at positions of scribing channels on the front surface of a wafer, wherein the scribing grooves expose a metal layer at the backside of the wafer; filling in the scribing grooves with plastic packaging materials; and cutting the wafer by employing a blade cutting mode to obtain a plurality of independent chips. According to the scribing method of the power chip, the scribing grooves are firstly prepared on the front surface of the wafer and extend to the metal layer at the backside of the wafer so that the cutting strength for subsequent mechanical cutting by employing diamond grinding wheel scribing can be greatly reduced; later, theplastic packaging materials are filled in the scribing grooves so that sidewalls of the chips are protected by the plastic packaging materials, and the withstand voltage grade of the chips is improved; and finally, the plurality of independent power chips are obtained by cutting of the wafer through the blade so that the problem of edge breakage at edges of the front surfaces and the backsides ofthe scribed chips due to scribing of the power chips through the mechanical cutting mode in the prior art is solved.

The invention discloses a bridge type bidirectional non-arc direct-current circuit breaker. The bridge type bidirectional non-arc direct-current circuit breaker comprises a main current circuit, a transfer current circuit and an energy consumption circuit, wherein the main current circuit is used for enabling current under a normal working state to pass; the energy consumption circuit is used for consuming energy of short-circuit failure current when the short-circuit failure current reaches a threshold value and the transfer current circuit is switched off; the transfer current circuit adopts a bridge type circuit and a breakover control for increasing the withstand voltage level and prolonging the service life of the circuit, and is used for realizing transfer of the short-circuit failure current from the main current circuit when the short-circuit failure current occurs; meanwhile, the transfer current circuit adopts one group of unidirectional power semiconductors having switch-off ability, thereby realizing bidirectional breaking of current; compared with the prior art, at least 50 percent of the unidirectional power semiconductors having the switch-off ability are saved, and the volume and the manufacturing cost of the bridge type bidirectional non-arc direct-current circuit breaker are effectively reduced.

The invention discloses an ultraviolet photodiode based on NiO / Ga2O3, comprising a top electrode and a bottom electrode, wherein A P-type crystal NiO film, an I-type crystal beta-Ga2O3 film, and an N-type single crystal beta-Ga2O3 substrate are sequentially disposed between the two electrodes from the top electrode to the bottom electrode. The invention also discloses a preparation method of an ultraviolet photodiode based on NiO / Ga2O3. The invention solves the problem that the Ga2O3-based pn junction ultraviolet photodiode cannot be prepared due to the lack of p-type Ga2O3 material in the prior art.

The invention discloses a non-isolated grid-connected converter, an air-conditioning system and a converter control method, which belong to the field of efficient grid-connected converters, and are designed for solving the problems of large size of the existing devices and the like. The non-isolated grid-connected converter at least comprises a rectifying and inverting unit, and has the bidirectional functions of rectification and inversion. The air-conditioning system comprises the non-isolated grid-connected converter. The control method based on the non-isolated grid-connected converter comprises a rectification mode. The non-isolated grid-connected converter adopts a bidirectional DC / AC converter to realize rectification, PFC and grid-connection functions, omits an isolation transformer, reduces number of devices, and is small in size. The air-conditioning system provided by the invention is small in size and higher in energy efficiency. The control method of the non-isolated grid-connected converter achieves the effects of low leakage current and high grid access current, can increase the voltage withstand level through rectification, reduces AC harmonic voltage and current, and increases power factors.

The invention relates to the field of cables, and in particular relates to a low-smoke halogen-free flame-retardant cable and a manufacturing method thereof. The low-smoke halogen-free flame-retardant cable comprises a conductive core, wherein an insulating layer is arranged outside the conductive core and has a three-layer structure; the outer layer is made of low-smoke halogen-free flame-retardant polyolefin; and the middle layer and the inner layer are made of cross-linked polyolefin. The insulating layer of the cable is designed into an asymmetrical three-layer structure, so that the insulating layer has low-smoke halogen-free flame retardancy, excellent tensile strength, breaking elongation and other comprehensive mechanical properties, and the insulating layer of the cable has high voltage-resistant level.

The invention provides a method for manufacturing calcined type fireproof mica tape. The method includes the steps of preparing tackiness agents, preparing tackiness agent solutions, coating glass fabric with the tackiness agent solutions, gluing mica paper and the glass fabric, and carrying out baking in a dryer. The method is characterized in that baking is carried out within three periods at different temperatures. The mica tape produced with the method is free of falling, powder falling, foam generating and reverse gluing and good in breathability, the mica paper is not separated from the glass fabric after the mica tape is soaked by methylbenzene for seventy-two hours, and the temperature resistant level and the voltage withstand level of the mica tape are higher; in addition, the rate of finished products is quite high, flexibility is excellent, and various properties are more stable.

The invention discloses a method for measuring ground potential by use of a multilayer sensor structure, and also discloses a multilayer sensor structure. The multilayer sensor structure comprises four copper-sheet electrodes, the four copper-sheet electrodes are successively arranged in a parallel mode and are successively a copper-sheet electrode I, a copper-sheet electrode II, a copper-sheet electrode III and a copper-sheet electrode IV from top to bottom, the copper-sheet electrode I and the copper-sheet electrode II have the same specifications, the copper-sheet electrode III and the copper-sheet electrode IV have the same specifications, the specifications of the copper-sheet electrode I and the copper-sheet electrode II are smaller than the specifications of the copper-sheet electrode III and the copper-sheet electrode IV, and the four copper-sheet electrodes are sealed in an epoxy resin insulation material. The method provided by the invention overcomes disadvantages of a conventional measurement method, can directly obtain the ground potential of a detected point, realizes real-time monitoring of ground potential values, and is convenient to use and is reliable in measurement result.

The invention discloses a CuAlO2 / Ga2O3 ultraviolet photodiode, comprising a top electrode and a bottom electrode, wherein a P-type crystal CuAlO2 film, an I-type beta-Ga2O3 film, and an N-type singlecrystal beta-Ga2O3 substrate are sequentially disposed between the two electrodes from the top electrode to the bottom electrode. The invention also discloses a preparation method of a CuAlO2 / Ga2O3 ultraviolet photoelectric diode. The invention solves the problem that the Ga2O3-based PIN ultraviolet photoelectric diode cannot be prepared due to the shortage of p-type Ga2O3 material in the prior art.

The invention discloses a longitudinal super junction metal oxide field effect transistor, which comprises an N type doped semiconductor substrate and an N type doped epitaxial layer formed in sequence from bottom to top, wherein a first P type filling trap area and second P type filling trap areas with the same structures are formed inside the N type doped epitaxial layer from inside to outside; the upper side of the first P type filling trap area is provided with a first P type doped area; a second P type doped area and a P type doped unipotential ring are arranged on the upper side of each second P type filling trap area from inside to outside, and a terminal voltage-resistant structural area T is formed by the three parts; the second P type doped areas are arranged corresponding to the second P type filling trap areas; the P type doped unipotential rings are larger than the second P type filling trap areas in widths, and are correspondingly arranged in parallel over the second P type filling trap areas respectively along the length direction of the transistor; an N type doped area is arranged in each P type doped area, and constructs a primitive cell source electrode area C with the first P type filling trap area. By adopting the transistor, the surface potential distribution is optimized.

The invention relates to a grid switching method of a control system for inner-city rapid rail vehicles and the control system. An AC (alternating current) or DC (direct current) high voltage signal input by a catenary is directly sent to an AC-DC dual-purpose electronic type voltage transformer after obtained by a pantograph, processed by the AC-DC dual-purpose electronic type voltage transformer and sent to locomotive related equipment in a DC or AC analog manner, and meanwhile, an AC or DC switching value signal is sent to the locomotive related equipment to be used as the unique signal for detecting the voltage system of a power supply grid and the grid voltage value. The control system comprises a high voltage head part and a control case part, wherein the high voltage head part switches 25 kV AC or 1.5 kV DC high voltage from the power supply grid into a proper voltage signal capable of being processed by a weakening device after resistive subdivision; then the control case transmits an input sampling signal to an AC analog output circuit or a DC analog output circuit to be output in an analog manner; the output signal is sent to the locomotive related equipment after amplified and intensified.

The invention discloses a surface breakdown type two-pair-rod electrode structural triggered vacuum switch. The triggered vacuum switch is of a three-section structure, comprising a corrugated ceramic housing at the upper section, another corrugated ceramic housing at the lower section, a metal shielding cover in the middle section, an upper electrode, a lower electrode, a triggering electrode, an upper electrode metal connecting rod, an upper electrode flange plate, a lower electrode metal connecting rod and a lower electrode flange plate; the upper electrode and the lower electrode are arranged in the metal shielding cover; the upper electrode flange plate is connected with the corrugated ceramic housing at the upper section; the lower electrode flange plate is connected with the corrugated ceramic housing at the lower section and forms a closed housing with the metal shielding layer; the upper electrode flange plate is connected to the corrugated ceramic housing at the upper section, and the lower electrode flange plate is connected to the corrugated ceramic housing at the lower section, so as to effectively increase the creepage distance between the upper electrode flange plate and the lower electrode flange plate. The triggered vacuum switch is high in working voltage, large in arcing area, high in transfer coulomb during conducting, long in service life under large current, uniform in electrode ablation degree, and high in power frequency withstand voltage after quenching of arc.

The invention relates to a multifunctional arc-extinguishing converter and a control method thereof, the multifunctional arc-extinguishing converter comprises a three-phase cascaded H-bridge shaping circuit unit, each phase in the cascaded H-bridge shaping circuit unit has the same structure and comprises a plurality of sub-modules, the multifunctional arc-extinguishing converter also comprises a square wave circuit unit connected in series with the cascaded H-bridge shaping circuit unit, and the square wave circuit unit is connected in series with the cascaded H-bridge shaping circuit unit. The square wave circuit unit is a three-phase four-bridge-arm diode clamping type circuit. According to the multifunctional arc-extinguishing converter, when a power distribution network is normal, n phases of an NPC converter in a square wave circuit unit are blocked, the multifunctional arc-extinguishing converter works in a reactive compensation mode, and when the power distribution network has a single-phase earth fault, the multifunctional arc-extinguishing converter works in an arc-extinguishing mode; one phase or two phases of non-fault phases are used for injecting arc extinction current to compensate the ground capacitance current of the power distribution network, so that the current of a fault point is inhibited to be 0. According to the multifunctional arc extinction converter, the cascade number can be effectively reduced, the cost is reduced, the loss is reduced, and the efficiency and the power density are improved.

The invention relates to the technical field of power systems, and specifically relates to a power electronic transformer based on virtual grid flux orientation. The invention discloses a power electronic transformer based on virtual grid flux orientation, comprising a rectifier, a middle isolation level, an inverter, and a control board. The alternating-current side of the rectifier is connected with a grid, and the direct-current side of the rectifier is connected with a high-voltage port of the middle isolation level. The direct-current side of the inverter is connected with a low-voltage port of the middle isolation level, and the alternating-current side of the inverter is connected with a transmission line or load. The control board is connected with the rectifier, the middle isolation level and the inverter. The control board generates pulse signals, and controls on-off of power switching devices of the rectifier, the middle isolation level and the inverter. The control board adopts a directional control strategy based on virtual flux to reduce the impact of grid fluctuation on the system.

The invention provides an alternating and direct current integrated intelligent charging connecting device and belongs to the field of electric bicycle charging piles. The alternating and direct current integrated intelligent charging connecting device comprises a charging pile, a direct current charger, a single-phase alternating charger, a three-phase alternating charger and a controller, an alternating and direct current charging socket is arranged and comprises a direct current charging needle, a single-phase alternating current charging needle, a three-phase alternating charging needle, a grounded needle and two auxiliary needles, and the output ends of the direct current charger, the single-phase alternating current charger, the three-phase alternating current charger and the controller are connected with the direct current charging needle, the single-phase alternating current charging needle, the three-phase alternating charging needle and six auxiliary needles of the alternating and direct current charging socket in parallel respectively through a switch device. The switch device is provided with three switches, the number of charging piles of an electric bicycle is increased, and charging convenience is improved.

The invention discloses an air kinetic energy ejection launcher for a spacecraft. The air kinetic energy ejection launcher for the spacecraft comprises an air inflation mechanism and a high pressure air spherical tank. The air inflation mechanism is communicated with the high pressure air spherical tank and used for providing vaporized gas for the high pressure air spherical tank, a blind plate cover with the gear shaped inner edge is installed on the opening in the top of the high pressure air spherical tank, a blind plate with the gear shaped outer edge is installed in the blind plate cover, the blind plate cover is connected with an electromagnetic drive device, after the electromagnetic drive device detects that the gas in the high pressure air spherical tank reaches the preset value, an operator operates the electromagnetic drive device to drive the blind plate cover to rotate by one gear, an ejection guide rail is also arranged on the upper end of the blind plate cover, the track cross-section shape of the ejection guide rail is matched with the shape of the blind plate, so that the blind plate can conduct ejection movements in the ejection guide rail under the push of the air pressure, the extending part of the upper end of the ejection guide rail is provided with a guide cylinder, and the spacecraft is installed above the blind plate. The device can reduce more than 90% of the void volume and launch weight, the launch speed of the spacecraft can be higher than 30,000-300,000 m / s, and the cost is low.

The invention provides a pole component of a solid sealed terminal. The pole component comprises an upper shield, a lower shield and a vacuum arc-extinguishing chamber, wherein the upper shield and the lower shield are embedded and fixed in a shell of the solid-sealed terminal by a castable insulating material, and the vacuum arc-extinguishing chamber is fixed in the shell of the solid-sealed terminal in a manner of being parallel with or perpendicular to the axial direction of the upper shield and the lower shield. By adopting the technical scheme, a high electric field is transferred to the interior of the insulating layer through the upper shield and the lower shield arranged on the pole component, so that the problem that the electric field in the upper side and the lower side of the terminal is distributed unevenly can be avoided, especially the problem that the junction of three media and the tip of a conductor cause the exceeding of electric field values can be solved.

The invention provides an earthing switch device which can be switched between a separating brake state and an on-position state. The earthing switch device comprises an underframe (1), at least one pair of fixed contacts (2), at least one pair of movable contacts (3), a main shaft (4), a connecting lever part (7) and a shield part (6), and the main shaft (4) is arranged on the underframe (1) in a rotating mode. The connecting lever part (7) is used for fixed installation of the movable contacts (3) on the main shaft (4). The shape and / or arrangement of the shield part (6) allows the earthing switch device to shield the connecting lever part (7) under the separating brake state, opposite to the static contacts (2). The earthing switch device can at least eliminate top electric field between the fixed contacts (2) and the connecting lever part (7), and improves evenness of electric field of the earthing switch device.