134results about How to "Accelerate off" patented technology

This invention discloses a measuring and controlling method of the direct earth insulating parameter of the distribution network. It has such steps as setting a high inductive-value reactor at the neutral point of the distribution network and a capacity-adjusting ground fault neutralizer injecting the frequency-changing current signal to the distribution network via the reactor, real-time measuring the back current signal and computing the direct earth capacitance, resistance and damping ratio of the distribution network. It detects the single-phase ground fault according to the displacement voltage and the damping ratio and instantly shuts the switch of ground fault neutralizer when the single-phase ground fault occurs and inputting proper ground fault neutralizer, compensating the network capacitance current and accelerating the extinguishing of the fault voltaic arc. This measuring and controlling method has high measuring accuracy and good real time and specially being appropriate to the single-phase loading distribution network. It thoroughly settles the neutral-point displacement voltage of the high-symmetry distribution network, fault arc blowout and the on-line puzzle of the targeted insulating parameter which is good to improve the indices of the reliability of the distribution network.

The invention relates to a mine liquid-CO2 fire preventing and extinguishing process and device for preventing and extinguishing fire by conveying liquid CO2 to an underground fire zone and injecting a fire zone by using the liquid CO2 and utilizing the liquid CO2 to asphyxiate oxygen in the fire zone, cool, decrease temperature and inertly suppress explosion. A mine liquid-CO2 fire preventing and extinguishing system comprises a liquid CO2 tank car (1), a liquid CO2 storage tank (2), a carburetor (10), a self-pressurization pipeline, a liquid inlet and outlet pipeline, and the like; and the fire preventing and extinguishing device comprises the liquid CO2 storage tank (2), the carburetor (10), the self-pressurization pipeline, the liquid inlet and outlet pipeline, and the like, wherein the self-pressurization pipeline comprises a self-pressurization liquid outlet pipeline and a self-pressurization gas intake pipeline and is combined with the carburetor (10) to form a self-pressurization system so as to realize the self comprehension of pressure in the tank. The invention solves the technical problem of the gasification and icing in the liquid CO2 tank and the pipeline conveying process, realizes safe transfer, storage, transmission and injection and has the advantages of high extinguishment speed, simpleness of operation, low cost, operation stability, remarkable fire extinguishment and prevention effects, wide practicability and the like.

The invention discloses a halogen-free inflaming-retarding high impact polystyrene resin, comprising the following components based on parts by weight: 70-90 parts of high impact polystyrene resin, 10-30 parts of polyphenyl ether, 3.0-20 parts of phosphate ester fire retardant, 1.0-5.0 parts of flexibilizer, 0.1-5.0 parts of epoxy plasticizer, 0.2-1.0 parts of anti-oxidant and 0.2-2.0 parts of lubricating agent. The invention uses PPO, phosphate ester fire retardant and epoxy plasticizer to form synergistic inflaming retarding system which has high inflaming retarding efficiency and excellentmechanical performance.

A bottom-contacted top gate thin film transistor (TFT) with enhanced off current suppression is provided, along with an associated fabrication method. The method provided a substrate. Source and drain regions are formed overlying the substrate, each having a channel interface top surface. A channel is interposed between the source and drain, with contact regions immediately overlying the source / drain (S / D) interface top surfaces. A first dielectric layer is conformally deposited. Then, a second dielectric layer is formed overlying the S / D interface top surfaces, with an opening exposing a portion of the first dielectric overlying the channel. A gate is formed overlying the second dielectric layer and the exposed portion of the first dielectric layer.

Method is provided for after market conversion of a 4×4 vehicle produced by a manufacturer into a high mobility vehicle having increased maneuverability and on-road and / or off-road capability, relative to the 4×4 vehicle. The 4×4 vehicle has a chassis with a frame, front axle and rear axle, said chassis having a standard wheelbase. The method includes dismounting at least one of the front axle or rear axle from the frame; shortening said frame; and mounting the dismounted axle to the shortened frame so as to obtain a shortened chassis having a shortened wheelbase which is shorter than any standard wheelbase of the line of models produced by the manufacturer.

The invention discloses an electric arc compressed arc-extinguishing lightning protection gap device. The electric arc compressed arc-extinguishing lightning protection gap device comprises a lightning protection device main body and an arc-striking electrode, wherein the arc-striking electrode is fixedly arranged at one end of the lightning protection device main body, and the other end of the lightning protection device main body is fixedly arranged on a cross arm or at one end of an insulator chain through a connecting armor clamp; the lightning protection device main body is provided with an arc-extinguishing path which consists of a plurality of arc-extinguishing passages and is in Z-shaped cyclic arrangement; an arc-extinguishing tube at the inlet of the first arc-extinguishing passage of the arc-extinguishing path is connected with the arc-striking electrode through an arc-guiding rod, and an arc-extinguishing tube at the outlet of the final arc-extinguishing passage is connected with the connecting armor clamp, wherein a three-way tube is arranged at the joint of every two adjacent arc-extinguishing passages; an arc-guiding electrode is arranged at each of two ends of the three-way tube respectively; one end of each of the arc-guiding electrodes stretches into the three-way tube, and the other ends of the arc-guiding electrodes are connected with the adjacent arc-extinguishing tube in a direct contact manner or through leads. The electric arc compressed arc-extinguishing lightning protection gap device is simple in structure, reasonable in design, high in arc-extinguishing capacity and stable and reliable to operate.

The related magnetic latching relay with grating sheet comprises: a body; on the body, a moving and fixed contact head, an electromagnetic drive mechanism with permanent magnet to conduct or separate two contact heads. Wherein, some iron grating sheets are set between contact heads along running direction of the moving contact head. This invention generates cathode effect to accelerate arc-extinguishing, and improves performance of the relay.

The invention discloses a heatproof 105 DEG C polyvinyl chloride cable material and a preparation method thereof, the cable material comprises the following raw materials by weight: 100 parts of SG-3 pvc resins, 15-20 parts of bisphenol A polycarbonate, 8-12 parts of chlorinated polyethylene, 25-35 parts of tricapryl trimellitate, 10-15 parts of diisodecyl phthalate, 5-10 parts of pentaerythritol stearate, 10-15 parts of barium sulfate, 5-10 parts of nano wollastonite, 4-8 parts of composite filling material, 1-2 parts of AMTEOS, 5-8 parts of calcium zinc composite stabilizing agent, 1-2 parts of barium stearate, 1-2 parts of ethylene bis stearamide, 10-15 parts of zinc borate, 5-10 parts of decabromodiphenyl oxide and 0.5-1 part of anti-oxidant. The cable material has excellent mechanical strength, heat stability, weather resistance and ageing resistance, and good flame retardation effect, flare quenching can be rapidly carried out after flame disappears, other material can not be combusted, the smoke amount is little while the cable material is combusted, can be used under 105 DEG C for long-term, and the usage life of the cable can be increased.

The invention relates to a double-layer flame-retardant textile fabric and a manufacturing method thereof. The textile fabric is provided with two surface layers, wherein a flame-retardant hot melt adhesive is filled between the layers; the surface layers are formed by interweaving warps and wefts; the warps and the wefts are soaked in a specific flame-retardant chemical agent before weaving; the warps comprise stainless steel fibers, polyester kapok, kapok nylon filaments and 20 D chinlon matt FDY (Fully Drawn Yarn) filaments; the wefts comprise kapok, flax, wool and the 20 D chinlon matt FDY filaments; the cross section of each warp or each weft is flat rectangular, and the stiffness of the fabric can be improved. The warp and weft materials are soaked with the flame-retardant chemical agent, so that an effect for preventing a fire from spreading is realized, a fire retarding agent sprayed on the fabric has a surface inflaming retarding effect, the fire retarding agent is combined with the fabric, so that the fabric can be woven tightly, the air permeability is poor, and the flame-retardant effect of the fabric can be improved; and the manufacturing method of the fabric is simple, and a plurality of the warps and wefts are twisted, so that the stiffness and the impermeability of the fabric are improved.

The invention discloses a miniature circuit breaker with a high breaking capacity, which comprises a shell, wherein the shell is internally provided with a magnet yoke assembly, a moving contact assembly, an arc extinction system and an actuating mechanism. A magnet yoke, a wiring board and a connecting sheet in the magnet yoke assembly are designed into a whole to ensure that the structure of the magnet yoke assembly is simplified, the quantity of soldered dots of the magnet yoke assembly is reduced and the internal resistance of a circuit breaker is lowered; a moving contact in the moving contact assembly comprises a contact support and a contact which are connected, the specific gravity of the contact support is smaller than that of the moving contact, and a magnet conductive plate is additionally arranged on the back of the moving contact and used for accelerating the transfer of an electric arc, therefore, the breaking capacity of the circuit breaker is improved; and a plurality of linkage lug bosses used for multipolar linkage are arranged on a contact support body, thus the linkage performance of the multipole circuit breaker is effectively ensured. A coil is connected with the moving contact through an annealed copper wire in a spot welding manner, and the soldered spots are moved from the linkage lug bosses to the moving contact without influencing the linkage property of the multipole circuit breaker. The invention has the advantages of high breaking capacity, high consistency of the interelectrode linkage and good reliability performance.

The invention relates to a device (1) for protecting an electric installation against overvoltage comprising at least one protection component (10) provided with means for connecting to said electric installation, means for disconnecting the protection component (10) therefrom which are movable from a closed position to an open position, thereby forming an interstitial space (11) between the disconnecting and connecting means in such a way that an electric arc is formed therein. The inventive device is characterised in that it is provided with means (50) which approaches said electric arc from at least two different directions in order to reduce the cross-section thereof. Said invention is used for protecting against overvoltage.

The invention relates to the technical field of flexible direct current output, in particular to a fault processing system of a multi-terminal flexible direct-current transmission line and a control method of the fault processing system. The system comprises a high-voltage direct-current circuit breaker which is connected to the output ends of a flexible direct-current convertor station separately, and further comprises a current-limiting inductor and an energy dissipation circuit, wherein the current-limiting inductor and the energy dissipation circuit are connected between the output end ofthe flexible direct-current converter station and the high-voltage direct-current circuit breaker; the current-limiting inductor is connected with the energy dissipation circuit in parallel, and the current-limiting inductor is used for limiting the fault current; the energy dissipation circuit is used for dissipating energy of the fault current. By means of the method and the device, the effect that the current limiting inductor can better inhibit the peak of the fault current can be achieved, and the rising speed of the fault current is reduced, and the requirements of fault removal on the on-off capacity and the on-off speed of the high-voltage direct-current circuit breaker can be reduced; and an energy absorption resistor and a metal oxide lightning arrester MOA in the high-voltage direct-current circuit breaker jointly dissipate the energy of the fault current, so that the fault current can be accelerated to be extinguished, thereby improving the fault isolation speed.

The invention belongs to the field of high-voltage SF6 circuit breakers, in particular to a gas rotation energy separation type high-voltage SF6 circuit breaker and an energy separation method thereof. The circuit breaker comprises a piston (1), an air cylinder (2), a movable main contact (3), a movable arcing contact (4), a static arcing contact (5), a static main contact (6) and a nozzle (7), wherein a vortex diversion mechanism (8) is fixedly arranged near the end part of the movable arcing contact (4) on the upstream of the nozzle (7), consists of a group of flow deflector units (9) with intersected structures and can consist of a fan blade type flow deflector (16) or a screw type flow deflector (21). By the circuit breaker and the method, SF6 gas which flows out of the air cylinder is subjected to vortex motion, temperature gradient variation along the radial direction is formed in the motion process, and arc energy is quickly dissipated; and the circuit breaker has a high arc temperature reduction speed, a high insulating property, high breaking capacity and high operation reliability and is convenient to mount and maintain.

The present invention provides a DC circuit breaker arc extinguishing chamber which comprises a shell with a mounting inner cavity and a plurality of metal gates which are installed in the mounting inner cavity side by side. An arc extinguishing space with two through ends is formed between any two adjacent metal gates. The shell also comprises a containing inner cavity for containing DC circuit breaker moving and static contacts, and the containing inner cavity communicates with one end of the arc extinguishing space. The shell side wall which forms the containing inner cavity is also provided with a first magnetic shield plate for shielding a magnetic field. When the moving and static contacts of the DC circuit breaker are disconnected to generate an electric arc, the first magnetic shield plate can protect the electric arc from being interrupted by an external magnetic field, the magnetic field generated at moving and static contact positions is gathered in the containing inner cavity such that the electric arc is rapidly and stably driven to the metal gates to extinguish the arc under the effect of the magnetic field generated at moving and static contact positions, and thus the stability of arc extinguishment is improved.

The invention provides an outdoor lighting device. The outdoor lighting device includes: a light source driving circuit board, on which a light source driving circuit is arranged; a light source board, on which a light emitting diode light source electrically connected to the light source driving circuit is installed, and the light emitting diode light source A plurality of light-emitting diodes are included, and the plurality of light-emitting diodes include small light-incidence-angle light-emitting diodes. The outdoor lighting device has the advantages of simple structure, low micro-current power consumption, no heat generation, strong anti-interference ability to power supply, explosion-proof function, long life without maintenance, good versatility, low cost, long-term lighting does not affect eye health, etc., mainly The performance parameters meet the requirements of relevant national standards, and the produced light-emitting diodes with small beam angles can be used in the lighting system, which greatly reduces the production cost and does not need to discard the light-emitting diodes with small beam angles.

The structure of the moving contact of the high-voltage DC sealed contactor mainly includes the first moving contact piece, the moving contact, the first upper bushing, the electromagnetic drive system, the second upper bushing, the first contact spring and the support washer, each of which passes through The riveting and fasteners and the corresponding fixing holes are connected in sequence; the contact structure adopts a two-way double breakpoint structure, and also includes a second moving contact piece located under the first moving contact piece, and a second moving contact piece set under the second moving contact piece. The supporting adjustment washer on the piece and a second contact spring 1 arranged outside the first contact spring; the first moving contact piece and the second moving contact piece are in double “J” shape. The invention adopts the "J"-shaped structure design of the double-moving contact piece to accelerate the movement and extinguishment of the arc when the contact is disconnected, and reduces the loss of the contact; the use of the moving contact piece and the contact spring structure effectively reduces the ignition between the main contacts. The effective adjustment of arc time, contact wear and contact pressure enables the four breakpoints to be effectively contacted and disconnected, thereby improving product performance and life.

The invention provides a preparation method of an eco-friendly glass fiber wall cloth. Glass fibers are modified and combined with a specially-produced coating. After glass fiber modification, an aluminum-magnesium layer is arranged on the surfaces of the fibers so that combination performances of the fibers and the coating are improved and flame resistance is substantially improved. Through use of silane-modified beta cyclodextrin and a silane coupling agent, bonding properties of the coating and the glass fibers are improved. Through use of micron-order magnesium-aluminum hydrotalcite, flame retardation performances and UV resistance are improved. Through use of titanium dioxide, antibacterial effects are obtained and UV-resistant and shielding agent effects are obtained.

An improved miniature DC circuit breaker, which solves the problems in the prior art that the magnetic energy of the permanent magnet decreases under the high temperature of the arc and affects the reliability of the work. device, handle, locking mechanism, soft connection, moving contact, static contact, outlet terminal and arc extinguishing chamber. The technical points are: a vertically placed The magnetic blowing arc extinguishing device composed of a permanent magnet and two magnetic guide sheets, the N pole of the permanent magnet covered by a heat-insulating sleeve is facing upwards, and the S pole is facing down, which is seamlessly adsorbed on the conductors of the N and S extremes of the permanent magnet. The magnetic sheet and the arc shield made of heat-resistant materials are respectively packaged on the inner side of the insulating base and the insulating cover, and the arc starting angle is connected with the static contact and extended to the bottom of the arc extinguishing chamber. Its compact structure and reasonable design can not only improve the working voltage and arc breaking ability, but also significantly reduce the electrical wear of the contacts and prolong the service life of the contacts.

The invention relates to the technical field of transformer equipment, and discloses an anti-lightning electric power transformer, which includes telegraph poles. The lower part of the front side of the telegraph pole is fixedly equipped with a support frame; a transformer is fixedly installed on the middle part of the upper surface of the support frame and is located between the two telegraph poles; a low-voltage bushing is fixedly installed on one side of the upper surface of the transformer; and a protection switch box is fixedly installed on one side of the telegraph pole, and the protection switch box is electrically connected with the low-voltage bushing. Compared with the prior art, coils are arranged on the side between each two layers of spark gap, the other side corresponding tothe coils is provided with a barrier plate, a passage is formed in a lightning arrester after lightning strike, each coil generates electromagnetism to attract the barrier plate, and the barrier platedirectly divides the arc, thus accelerating the extinction of arc, solving the problem of long-term arc damaging the spark gap and nonlinear resistance, and prolonging the service life of each component in the lightning arrester.

Method is provided for after market conversion of a 4×4 vehicle produced by a manufacturer into a high mobility vehicle having increased maneuverability and on-road and / or off-road capability, relative to the 4×4 vehicle. The 4×4 vehicle has a chassis with a frame, front axle and rear axle, said chassis having a standard wheelbase. The method includes dismounting at least one of the front axle or rear axle from the frame; shortening said frame; and mounting the dismounted axle to the shortened frame so as to obtain a shortened chassis having a shortened wheelbase which is shorter than any standard wheelbase of the line of models produced by the manufacturer.

The invention discloses a breaker with a novel arc extinguishing chamber. The breaker with the novel arc extinguishing chamber comprises the arc extinguishing chamber, a static contact current-conducting plate provided with a static contact embedded in the arc extinguishing chamber, and a movable contact embedded in the arc extinguishing chamber and capable of being connected or disconnected with the static contact; the static contact current-conducting plate is further provided with a magnet yoke, the magnet yoke is formed with an open holding groove, and the movable contact is located in the holding groove of the magnet yoke. According to the breaker with the novel arc extinguishing chamber, the static contact current-conducting plate is provided with the magnet yoke, when there is a short in the circuit, the magnet yoke would generate a magnetic field to increase the magnetic blowout intensity and accelerate the electric arc extinguishing. The movable contact is located in the holding groove of the magnet yoke, and therefore, the magnetic field would be in contact with an electric arc in the largest area, and the electric arc can be extinguished quickly.

The present invention relates to an aerosol generating article (100) having a first section (114) including a combustible heat source (102) and an aerosol-forming substrate(104) and a second section (118) including a tubular element (150) defining a recess (152) at one end of the second section(118). The first and second sections (114, 118) are integrally connected at a region of weakness(122) andare separable at the region of weakness. This enables the tubular element (150) to be placed over the combustible heat source(102), after use of the aerosol generating article, such that the combustible heat source is at least partially received in the recess (152) to reduce the ignition propensity of the smoking article. The first section is upstream of the second section when the first and second sections are integrally connected and the tubular element is at least partially open at both of its ends such that air may be drawn through the tubular element. The tubular element is either at thedownstream end of the second section such that the recess forms a mouth end cavity, or is at the upstream end such that the recess forms a transfer element.

Method is provided for after market conversion of a 4×4 vehicle produced by a manufacturer into a high mobility vehicle having increased maneuverability and on-road and / or off-road capability, relative to the 4×4 vehicle. The 4×4 vehicle has a chassis with a frame, front axle and rear axle, said chassis having a standard wheelbase. The method includes dismounting at least one of the front axle or rear axle from the frame; shortening said frame; and mounting the dismounted axle to the shortened frame so as to obtain a shortened chassis having a shortened wheelbase which is shorter than any standard wheelbase of the line of models produced by the manufacturer.

The invention discloses a universal conversion switch with a magnetic quenching function. The universal conversion switch comprises a square shaft, a contact box, a cam, a movable wafer, a static wafer, a movable contact base and a reset spring. The movable wafer is an elastic metal sheet, and a static contact matched with a movable contact is arranged at one end of the static wafer. According to the universal conversion switch, only one movable contact and static contact pair is arranged in one electric loop, contact and separation of the movable contact and the static contact are conducted by using the reset spring-back pressure of the movable wafer, the separation speed is high, the breaking capacity is high, arcing and burning phenomena are not prone to occurring in the contacts, the stability of the universal conversion switch is improved, and the service life of the universal conversion switch is prolonged. Meanwhile, magnetic steel is arranged at the part, close to the static contact, in the contact box, the magnetic field action direction of the magnetic steel enables electric arcs to move in the moving direction of the movable contact, the magnetic field generated by the magnetic steel enables the electric arcs which may be generated because of large current breaking between the movable contact and the static contact to be lengthened, arc extinguishing is accelerated, and therefore the breaking capacity and the reliability of the universal conversion switch are improved.

The invention relates to the technical field of power distribution cabinets, in particular to a safe and environment-friendly low-voltage power distribution cabinet which is characterized in that a bottom plate is fixedly mounted at the bottom end of a rectangular cylinder, a plurality of uniformly distributed ventilation openings are formed in two corresponding side surfaces of a cabinet body respectively, and connecting plates are fixedly mounted on two sides of each group of adjacent ventilation openings through screws respectively; each connecting plate is fixedly provided with a vertically-arranged U-shaped plate, a sliding plate matched with the two U-shaped plates is inserted between the two U-shaped plates, the inner side face of each sliding plate is fixedly provided with a flexible sealing plate, the inner side faces of the flexible sealing plates make contact with the surface of the cabinet body, and the flexible sealing plates cover all the ventilation openings. The bottomend of each sliding plate is fixedly connected with a lifting movement mechanism, and the two lifting movement mechanisms are in transmission connection to the same driving module. By arranging the flexible sealing plate capable of ascending and descending and the inert gas storage bottle capable of injecting inert gas into the cabinet body, fire extinguishing operation can be automatically conducted, and meanwhile, the fire extinguishing mode is quite environmentally friendly.

The invention provides a double-breakpoint moving contact apparatus. The apparatus comprises a moving contact limiting component, a first moving contact shaft, a first moving contact spring, a second moving contact spring, a first limiting component shaft, a second limiting component shaft and a moving-contact contact blade. The moving contact limiting component and a moving contact shell form a moving contact installation space. The first limiting component shaft is arranged on an upper end surface of an inner side of the moving contact limiting component. The second limiting component shaft is arranged on a lower end surface of the inner side of the moving contact limiting component. The first moving contact spring sleeves the first limiting component shaft. One end of the first moving contact spring is connected to the upper end surface of the inner side of the moving contact limiting component and the other end is connected to an upper side surface of the moving-contact contact blade. In the invention, a rotary-type double-breakpoint structure is adopted; the moving-contact contact blade adopts a multiple-piece type and a model with main and auxiliary contacts. Through using the double-breakpoint structure, a short-circuit connection and disconnection capability of a product can be effectively increased. Through using a multiple-piece type contact structure, a short time connection and short-term tolerance capability can be increased. And damages of an arc to a main contact can be reduced.

The invention provides an indoor lighting device. The indoor lighting device includes: a light source driving circuit board, on which a light source driving circuit is arranged; a light source board, on which an LED light source electrically connected to the light source driving circuit is installed, and the LED light source It includes a plurality of light emitting diodes, and the plurality of light emitting diodes include at least one of a medium beam angle light emitting diode and a large beam angle light emitting diode. The indoor lighting device has the advantages of simple structure, low micro-current power consumption, no heat generation, strong anti-interference ability to power supply, explosion-proof function, long life without maintenance, good versatility, low cost, long-term lighting does not affect eye health, etc., mainly The performance parameters meet the requirements of relevant national standards.

The invention discloses a cross-linked polyethylene insulated halogen-free low-smoke flame-retardant rat-proof and termite-proof medium-voltage power cable, which comprises a cable core and a flame-retardant wrapping tape, the cable core is embedded in the flame-retardant wrapping tape, and the cable core comprises three conductor wire cores, each conductor wire core comprises a conductor which is sequentially coated with a conductor shielding layer, a cross-linked polyethylene insulating layer, an insulating shielding layer and a metal shielding layer from inside to outside, and a gap between the flame-retardant wrapping tape and the cable core is filled with a filling layer; the conductor shielding layer, the cross-linked polyethylene insulating layer and the insulating shielding layer are formed by co-extruding three layers; the cable adopts a three-layer co-extrusion technology to extrude the conductor shielding layer, the crosslinked polyethylene insulating layer and the insulation shielding layer at one time, so that the adhesive performance among the three layers after cabling is met, and the layering phenomenon does not occur after extrusion; and the conductor shielding layer is not easy to scratch, so that excellent insulation and mechanical properties of the cable are ensured.

The invention provides a manufacturing method of an anti-wearing and anti-skid plastic woven bag, which includes: S1) blending and drying raw materials; S2) performing wire drawing; S3) weaving the bag; S4) preparing an anti-skid coating; S5) coating the bag with the coating; and S6) making the plastic woven bag. The invention provides the manufacturing method of the plastic woven bag which has good anti-skid effect and anti-wearing performance and is flame-retarding.

The invention discloses a method for enhancing the load capability of a big power relay. The method is that through meshes are additionally arranged on the contact surface of a contact part of the relay, and the quantity of the meshes additionally arranged on the contact surface is determined according to the size of the contact. A relay produced by adopting the method of the invention has the advantages of speeding up the electric arc extinction between contacts of the relay, accelerating heat dissipation of the relay contacts and improving the environmental mechanics property of a contact system of the relay, therefore the load capability of the relay can be enhanced. The invention is suitable for the manufacturing of the great load relay.