41results about How to "Large flow capacity" patented technology

The invention relates to a 10/350 impact current system of an air or vacuum CROWBAR switch, which comprises a capacity resistance connected with the power, a main discharging gap, an inductance and a resistance, wherein it coupled with a CROWBAR switch between the main discharging electrode and the capacity discharging circuit of the inductance; the CROWBAR switch comprises an active electrode and a fixed electrode or it fixes fabrics a trigger electrode in the fixed electrode or the discharging gap between the active electrode and the fixed electrode; it electric connects a trigger system between the active electrode and the fixed electrode or between the fixed electrode and the trigger electrode.

The invention discloses a combined type lightning arrester based on a disc-shaped multi-gap arc extinguishing and lightning protection device, in particular to a lightning arrester applied to overheadlines above 10KV. The structure of the invention is as follows: upper and lower connecting fittings are respectively arranged on the upper and lower parts of the insulating support rod, the upper spherical electrode is connected with the upper connecting fittings, the lower spherical electrode is connected with the lower connecting fittings, a first, second,.. N-th disk-shaped multi-gap arc extinguishing lightning protection device is serially connected between the upper connecting fittings and the lower connecting fittings, N is a natural number, 1 <= N <= 8. The lightning current is elongated, elongated and ejected to extinguish the electric arc, thereby avoiding the occurrence of inter-phase short circuit fault and reducing the counterattack probability caused by lightning strike lightning protection wire; and the lightning current is elongated, elongated and ejected. Strong ability to withstand lightning surge, large flow capacity, high security; Good consistency of discharge gapsize; Simple structure; The special multi-gap arc will not be reignited because of the rapid recovery of dielectric insulation after the power frequency continues to flow through the zero-extinguishing arc.

The method consists of the assistant discharging circuit containing a group of trigger electrodes setup between protected circuits or devices and a ground electrode and the main discharging circuit containing a main discharging gap. The characters of the invention are that the distance setting between the trigger electrode and the main discharging gap is based on following consideration. The assistant discharging circuit containing trigger electrodes sets the overvoltage threshold. When voltage is higher than the threshold, electric surge current flows through the trigger pole to the ground electrode. The current passing through the trigger pole sets the current threshold. When current is larger than the current threshold, electric arc is generated and electric discharge happens in main discharging gap.

The invention relates to a coaxial channel lightning protection device circuit, which comprises a gas discharge tube I, a transient voltage suppressor diode (also called TVS diode) II, a coupling resistor R and a fast recovery diode D; the gas discharge tube I is connected with the transient voltage suppressor diode II through the coupling resistor R. Compared with the prior art, the circuit provided by the invention has the advantages of large through-flow capacity (5KA), fast response speed (nano-second level), small volume, convenience in installation and the like; as a multi-level protection circuit is adopted, the residual voltage is low; and moreover, the circuit is suitable for overvoltage protection of related devices which transmit videos and data signals through a coaxial cable, and can protect the device from being damaged by sensing the overvoltage and operating the overvoltage.

The invention relates to a conversion current and over-voltage protection technology of electric equipment, in particular to a protector for preventing interception over-voltage and arc reignition over-voltage of a vacuum circuit breaker. A valve body of the protector is assembled by mutual series-parallel connection of a column-type valve plate RN1 of a ZnO non-linear resistor, a ring-type valveplate RN2of a Sic non-linear resistor, and a column-type valve plate RN3 of a ZnO non-linear resistor ; then output ends are connected to both ends of DL movable and stationary main contacts in parallel. The vacuum circuit breaker has the ability of converting current and limiting voltage when the large current is switched on and off, and the function of preventing the interception over-voltage and the arc reignition over-voltage when the low current is switched on and off. When the circuit breaker closes the switch, the current flows from both ends of the main contacts and does not flow in the protector, thus the protector can not have the aging problem, a loop can not cause the reignition over-voltage in the process of switching on and off, thereby protecting the main contact against burning or shortening the service life due to the arc reignition.

The invention discloses a disk-shaped multi-gap arc extinguishing lightning protection device based on a double-hemisphere T-shaped ceramic discharge tube, which relates to a lightning arrester applied to overhead lines above 10KV level. The structure of the device is as follows: 6 Ten double-hemisphere T-shaped ceramic discharge tubes are connected in series to form a series of arc-extinguishinggaps, which are arc-shaped in small segments. By 6 8 arc-extinguishing gap strings and 5 Seven outer-gap spherical electrodes are staggered in series to form a large-arc gap string, and the upper spherical electrode and the lower spherical electrode of the main gap spherical electrode are respectively connected at the ends of the large-arc gap string. The lightning current is elongated, elongated and ejected to extinguish the electric arc and reduce the counterstrike probability caused by lightning strike lightning wire. Strong ability to withstand lightning surge, large flow capacity, highsecurity; Discharge gap size consistency is good, impulse discharge, power frequency discharge is stable; The utility model has the advantages of simple structure, multiple external gaps arranged atthe same time, and the recovery speed of the dielectric insulation can be greatly improved after the lightning stroke of the device, and the dielectric insulation is not reignited after the arc is extinguished.

The invention relates to a protection device having functions of automatic control, energy moving and degradation self-separation for a vacuum arc extinguish chamber. The protection device comprises an automatic degradation off-line device TQ and an energy-moving component R1 which are arranged in series; the two ends of the energy-moving component R1 are connected with a resistor-capacitor (R-C) loop in parallel; a resistor R and a capacitor C in the R-C loop are connected in series; the automatic degradation off-line device TQ comprises a shell; a fuse is arranged in the shell; quartz sand is filled in the shell; a cavity is formed in the middle of the upper part of the shell; a post-degradation off-line indicator and a pre-compaction spring are arranged in the cavity and sealed in the cavity; the lower end of the fuse is connected with a second electrode; the upper end of the fuse passes through the pre-compaction spring and then is connected with the post-degradation off-line indicator; the upper part of the shell is provided with a first electrode; and a lead line of the first electrode is buried in the quartz sand. By the protection device, the reignition rate of a vacuum breaker can be reduced, and the reignition overvoltage, the shut-off overvoltage and the overvoltage during simultaneous cut-off of three phases can be reduced, so that the arc extinguish chamber of the vacuum breaker can be protected, and other electrical equipment can be also protected.

The invention discloses a rod-shaped multi-gap arc extinguishing lightning protection device based on a double-hemisphere T-shaped ceramic discharge tube, which relates to an arc extinguishing lightning protection device applied to overhead lines above 10KV level. The invention comprises a spherical electrode, an insulating umbrella tray, an internal insulating layer, a double-hemisphere T-shapedceramic discharge tube and a bolt electrode. 30 to 40 double hemisphere T-shape ceramic discharge tubes and bolt electrode are sequentially connected to form a rod-type integral body; An internal insulation layer is uniformly wrapped on the whole rod type, and an insulation umbrella tray is arranged on the external insulation layer of the internal insulation layer. The lightning current is elongated, elongated and ejected to extinguish the electric arc, thereby avoiding the occurrence of inter-phase short circuit fault and reducing the counterattack probability caused by lightning strike lightning protection wire; and the lightning current is elongated, elongated and ejected. Strong ability to withstand lightning surge, large flow capacity, high security; Discharge gap size consistency isgood, impulse discharge, power frequency discharge is stable; The utility model has the advantages of simple structure, high reliability and easy mass production.

The invention relates to a clearance overvoltage damping device, including an insulation cylinder, the interior of which is fixedly provided with a non-inductance resistor and a gas discharge tube, the non-inductance resistor is connected with the gas discharge tube in series, and terminal blocks are arranged on the insulation cylinder. The overvoltage which is caused by the transition process when throwing and cutting a capacitor group can be inhibited effectively, the invention can prevent the occurrence of the accidents of a capacitor, a discharge coil, a circuit breaker and other equipments, ensures the safe power supply and has obvious damping effect for the transition process which is caused by switching-on and re-ignition, the protection capability is strong and the service life is long.

The invention relates to a satellite technology, in particular to a Beidou 3G/4G video lightning protection terminal based on a high-resolution satellite receiving technology. The Beidou 3G/4G video lightning protection terminal is composed of an ARM processor, and a power management module, a speed sensor module, a high-resolution satellite receiving module, a telephone module, an expansion module, a lightning protection module, a 3G/4G communication module, a geomagnetic/BeiDou positioning module and an image processing module which are all connected with the ARM processor. The Beidou 3G/4G video lightning protection terminal has the characteristics of high accuracy of indoor positioning, long signal receiving distance, and good lightning protection performance.

An electromagnetic pulse protection method for an aircraft communication and navigation system, which includes an antenna and a transceiver, and a suppressor is connected in series between the antenna and the transceiver, and the suppressor is an independent structure that encapsulates suppression components. The suppressor is provided with a mounting base and two connecting plugs, one of which is a pin plug for connecting with an antenna, and the other connecting plug is a female plug for connecting with a transceiver.

The invention discloses a surge protection device of mid-span active Ethernet. The active Ethernet adopts mid-span, the surge protection device comprises a network signal protection unit, a power supply unit, an RJ45 input interface and an RJ45 output interface, the network signal protection unit comprises a first tripolar gas discharge tube, a second tripolar gas discharge tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a firs directional transient voltage suppressor and a second directional transient voltage suppressor, and the power supply unit comprises a first piezoresistor, a second piezoresistor, a third piezoresistor, a first inductor, a second inductor and a temperature fuse. The mid-span active Ethernet can suppress lightning overvoltage formed by electrostatic induction of lightning and electromagnetic induction, lightning current energy is released, and normal operation of the active Ethernet is ensured.

The invention provides a high-capacity overvoltage limiter core. The limiter core is formed by serially laminating parallel elements, wherein the parallel elements are respectively provided with a high voltage end and a low voltage end; each parallel element consists of a plurality of resistor sheets which are laminated in series, and the plurality of resistor sheets are electrically connected in parallel by virtue of a conducting wire I and a conducting wire II; the parallel elements are divided into parallel elements of an odd number and parallel elements of an even number, the resistor sheets in the parallel elements are divided into parallel resistor posts of an odd number and parallel resistor posts of an even number by virtue of the different distribution of the connecting conducting wire I, an insulation pad and the connecting conducting wire II, and the overvoltage limiter core of different voltage grades can be formed by serially laminating a plurality of parallel elements; while the discharge current capacity of the overvoltage limiter core is increased, the structure is compacter, the floor occupation area of the device can be reduced, a limiter is safe and reliable to operate, an electrical appliance of a power system can be prevented from suffering from the damage of the overvoltage, the development requirement of the power system can be met, and the safety operation of the power system can be guaranteed.

The invention discloses a SnO2 piezoresistor with high nonlinearity, low residual voltage and large discharge current capacity for power transmission of a power system, and a preparation method thereof. The piezoresistor comprises SnO2, Co3O4, Cr2O3, Ni2O3, Sb2O5 and Ta2O5. The preparation method comprises a main slurry preparation step, an auxiliary slurry preparation step, a mixing step, a forming step, a glue discharging step and a sintering step which are carried out in sequence. The SnO2 piezoresistor has the following advantages: the capability of the SnO2 piezoresistor for discharging and amplifying current is improved, so the purpose of enhancing the nonlinear coefficient and the discharge current capacity of the SnO2 piezoresistor is achieved; and the residual voltage ratio is inhibited at the lowest level, and the SnO2 piezoresistor has a better effect and a higher aging stability than a Ta or Sb element monodoped piezoresistor.

The invention belongs to the technical field of electronic components and particularly relates to a resistor disc for manufacturing a piezoresistor with high discharge current capacity. A ceramic chipof the resistor disc and a conductive electrode connected with the ceramic chip are covered with a protective layer; the ceramic chip is prepared from zinc oxide, bismuth oxide, antimonous oxide, manganese dioxide, cobaltic oxide, cobalt dioxide, niobium pentoxide, lanthanum oxide, strontium titanate, a nano additive and the like; the nano additive contains titanium oxide, lithium oxide, nickel oxide and other components; the protective layer is prepared from a binding material and bismuth glass powder and applied to the outermost layer of the resistor disc in a printed manner. Under the samesize, the piezoresistor produced from the resistor disc can bear higher surge current and is higher in discharge current capacity and lower in production cost.

The invention provides a novel gas discharge tube for coaxial cables, and belongs to the technical field of lightning protection overvoltage. The novel gas discharge tube comprises a cylindrical cavity, wherein the cavity comprises a cavity wall and plugs at the upper end and the lower end; an inert gas is arranged in the cavity; the cavity is connected to the coaxial cables in series through a metal shell; two ends of the metal shell are connected to the coaxial cables at two ends through connectors respectively; an electrode is arranged in the cavity in a radial manner; two ends of the electrode pass through the upper plug and the lower plug respectively to be connected with wire cores of the coaxial cables at two ends; the cavity wall is an electric conductor; the metal shell is connected with a grounding plate; the cavity wall, the metal shell and the grounding plate form a ground terminal; and the upper plug and the lower plug are made of insulating materials. The novel gas discharge tube has the beneficial effects that the gas discharge tube can be connected to coaxial transmission cables in series and the characteristics of a higher transmission frequency bandwidth, a lower loss, high lightning discharge capacity, more excellent protection voltage, safety and reliability can be achieved.