56results about How to "Short breaking time" patented technology

The method comprises: the internal router gets the virtual IP address of the virtual router, takes the virtual address as the destination address, and sends the information about external network to the virtual router. The invention also provide a system used in communication between IP devices. By the provided solution, when Master router swap happens, the conversion of internal dynamic protocol is accordance with the swap between the virtual router and master router so as to ensure the swapped master router is capable to receive the message from internal router in short time.

The invention discloses a method for extracting astaxanthin, which is finished by taking a rhodotorula or microalgae feed liquid containing the astaxanthin as a raw material, and performing separation, drying, crushing wall-breaking processes to the feed liquid. The method comprises the following concrete steps: the raw material is separated first to produce a mashed material with the water content less than or equal to 90 percent; the mashed material is dried to produce feed powder with the water content of between 5 and 10 percent; then an airflow crushing method is adopted to crush the feed powder to particles with diameters less than or equal to 10mu m. In the method, the drying is performed first and then the wall-breaking is performed, so the loss of the astaxanthin is reduced; the airflow crushing method is adopted, and has high wall-breaking rate and short wall-breaking time (only 1 minute or so), the temperature is between 20 and 30 DEG C during the wall-breaking process, and avoids the loss of the astaxanthin due to high-temperature oxidation; and the loss rate of the astaxanthin is less than or equal to 10 percent, and the wall-breaking rate is more than or equal to 90 percent.

The invention relates to a high voltage direct current breaker with multiple fractures and a tandem type. The breaker comprises a multi-fracture breaker, an oscillation loop and a dissipative element. The multi-fracture breaker includes a plurality of single-phase breakers and fractures of all the single-phase breaker are in series connection through connection buses; the multi-fracture breaker is respectively in parallel connection with the oscillation loop and the dissipative element through the connection buses; and a fracture of each the single-phase breaker is respectively in parallel connection with an RC equalizer circuit. According to the invention, fractures of a plurality of single-phase breakers are in series connection so as to form a multi-fracture tandem structure; effects of high drop-out voltage, heavy drop-put current and short drop-out time and the like are realized; and demands of ultra-high voltage and extra-high voltage direct current power transmission projects can be completely met. In addition, the oscillation loop in the invention is used for generating oscillation currents; the dissipative element is used for absorbing line energy and restricting overvoltages after currents are switched off; and the RC damping circuit is used for improving equalizing voltages between fractures of all the single-phase breakers.

The invention discloses a low energy consumption drying treatment technology of residual activated sludge. The treatment technology comprises the following steps: sending the residual activated sludge to a high speed shearing homogenizing tank, adding a treatment agent to the homogenizing tank, shearing and homogenizing the residual activated sludge and the treatment agent at 0-20 DEG C for 0.5-1 h, sending the obtained mixture to a sludge dehydrating machine, dehydrating the mixture to obtain a dehydrated sludge cake and sewage, sending the sewage to a sewage plant, further treating the sewage, sending the dehydrated sludge to a molding machine, extruding the dehydrated sludge to form strips, allowing the strips to enter a solar multilayer mesh belt type low temperature drying box through a conveyor belt, and drying the strips to obtain dried sludge with the water content being less than 15%. The technology decreases the water content of the residual sludge to 15% or less from 97% or above, and greatly reduces the volume of the sludge, and the dried sludge can be used as a further recycling raw material, or can be burnt.

The invention discloses a gas-steam combined cycle distributed energy three-power quick-cutting system and method. The system comprises three units, each unit is provided with a high-voltage factory busbar and a working power supply incoming line for providing a working incoming line power source, the working power supply incoming line is connected with the low voltage side of the main transformerthrough a current limiting reactor, and the two ends of the current limiting reactor are connected with a high speed current limiting protection switch in parallel; different emergency power supply incoming line switches are connected between the buses for high-voltage plants of any two units, the connection condition between the buses for the high-voltage plants between the units is controlled through the on-off of the emergency power supply incoming line switches; the features of the stage distribution of the power utilization loads, many units and the small capacity of the gas-steam combined cycle distributed energy plant are fully utilized, the working power source is got from the independent low-voltage side, the dual emergency power supplies are taken from the buses of the high-voltage plants of the adjacent units to solve the problems of the large investment, the wide area and the large power angle in the existing plant power quick-cutting configuration scheme.

The invention provides a fast, non-heat change and high-efficiency method for breaking ganoderma lucidum spore, belonging to the technical field of biology. The method comprises the steps of: 1. adding the ganoderma lucidum spore into water or 20-100% alcohol-containing solution or edible acid solution with the pH value of 3-7 or edible alkali solution with the pH value of 7-10, and evenly stirring to prepare mixture, wherein the weight ratio of the ganoderma lucidum spore to the solution is 1:5-15:2; and 2. processing the mixture under normal temperature though high-pressure pulse electric field to break, wherein the electric-field intensity is 10-110 kilovolt / cm and the number of the pulse is 1-800. By using the high-pressure pulse electric field, the method has less heat energy in the process of breaking, low raised temperature of a breaking target, and short breaking time. The breaking mechanism is not breaking the cell wall in the high-pressure pulse electric field but breaking the cell wall by forming a plurality of through holes on the surface of the cell wall by polar molecules in the solution under the function of the high-pressure pulse electric field, thereby improving the use ratio of bioactive substances.

The invention discloses a high-temperature guanidine gum cross-linking agent and a preparation method thereof. A preparation process of the guanidine gum cross-linking agent includes steps: preparing an organic boron cross-linking agent and an organic zirconium cross-linking agent, and well mixing according to a volume ratio of 0.15-0.2:1 to obtain an organic boron-zirconium cross-linking agent. The guanidine gum cross-linking agent is excellent in temperature resistance and shear resistance, gum viscosity measured by a HAAKE rheometer is still kept to be 100mPa.s or above after shearing of a cross-linking system for 2h at 180 DEG C and 170s<-1>, and ultrahigh-temperature-resistant guanidine gum cross-linking agent BZC and GHPG cross-linked gel is excellent in temperature resistance and shear resistance; the researched organic boron-zirconium cross-linking agent is capable of retarding cross linking for 1-4min; the cross-linking agent is excellent in gel breaking performance, short in gel breaking time and low in gel breaking liquid residue quantity and surface tension.

The invention relates to a method for extracting natural carotenoid from neurospora crassa and spores thereof, which comprises the following steps of: drying the neurospora crassa and spores thereof at 30-60 DEG C, pulverizing the culture into coarse powder, breaking walls for 30 s to 30 min by using a 0.1-3 mol / L hydrochloric acid solution through the normal temperature acid method, filtering the solution, leaching the filter residue for 1-60 min by using an organic solvent after water washing, evaporating the extracting solution at reduced pressure, and recovering the solvent to obtain coarse extract. Compared with the traditional carotenoid extraction method, the method provided by the invention has the advantages of simple process, high pigment extraction rate, low production cost, high carotenoid purity and the like.

The invention provides a nano-composite fracturing fluid as well as a preparation method and an application thereof. The nano-composite fracturing fluid is prepared from components in parts by weight as follows: 0.1-3.0 parts of a nano-composite thickening agent, 0.1-0.5 parts of a structure regulator, 0.1-1.0 part of a clay stabilizer, 0.1-1.0 part of a cleanup additive, 0.1-1.0 part of a foaming agent, 0.1-2.0 parts of an organic crosslinking agent, 0.01-0.5 parts of a gel breaker and 90.0-99.39 parts of water. Due to interaction between the structure regulator and the nano-composite thickening agent, the nano-composite fracturing fluid has extremely excellent sand carrying performance, good high-temperature resistance and anti-shearing performance, can effectively break gel in situ under a formation condition, can form multiscale nano-composite micelle through separate nano-dispersion and nucleation processes, is applicable to oil and gas exploitation in various stratum environments and improves the oil and gas injection and exploitation efficiency.

The invention discloses an ultra-high-speed mechanical switch, and belongs to the technical field of high-voltage direct current transmission. The ultra-high-speed mechanical switch can be applied to + / -200kV mixed type high-voltage direct-current breakers. The ultra-high-speed mechanical switch comprises a composite insulating sleeve provided with a conductive rod, a basin-type insulator, an upper contact base, a lower contact base, a bridge-connection conductive rod, a composite wedge-shaped contact structure, a transversely-moving-type movable contact system, an insulating pull rod, a bottom tank, a bridge-connection tank, a vertical tank and an ultra-high-speed hydraulic spring operation mechanism. The ultra-high-speed mechanical switch has the advantages of being simple in structure, small in fracture number, high in mechanical reliability, high in withstand voltage, high in switching-on and switching-off operation action and good in synchronism, and can meet the matching requirements of the + / -200kV mixed type high-voltage direct-current breakers.

The invention discloses a rapid transfer switch device and system and an application. The rapid transfer switch device comprises a working power supply vacuum circuit breaker, a standby power supply vacuum circuit breaker, a switching power supply, a frame base, a control module, a zero-crossing module and an output current measuring module; the working power supply vacuum circuit breaker, the standby power supply vacuum circuit breaker, the switching power supply, the control module and the zero-crossing module are fixed on the frame base; the control module is connected with the switching power supply, the zero-crossing module and the output current measuring module; the positive output end and the negative output end of the zero-crossing module are connected to moving contacts and static contacts of the working power supply vacuum circuit breaker and the standby power supply vacuum circuit breaker respectively; the output current measuring module is installed on the output bus of the working power supply vacuum circuit breaker and the output bus of the standby power supply vacuum circuit breaker; and the control module is used for sending a switching signal to the switching power supply and the zero-crossing module so as to achieve the two-way switching from the working power supply to the standby power supply, or from the standby power supply to the working power supply. The device disclosed by the invention is high in switching speed and high in reliability.

A processing device of a shielding layer at an end part of a shielding cable comprises a carding needle punching assembly and a pulling and stripping movement mechanism, wherein the carding needle punching assembly comprises a fixed seat, a plurality of carding needles, a rotary disc and a punching driving element, the pulling and stripping movement mechanism comprises a pulling and stripping sliding block, a pulling and stripping sliding rail and a pulling and stripping driving element, the pulling and stripping sliding block is fixedly connected with the carding needle punching assembly, the pulling and stripping sliding rail is connected with the pulling and stripping sliding block in a sliding way, the pulling and stripping driving element can drive the pulling and stripping sliding block to slide on the pulling and stripping sliding rail, the pulling and stripping sliding rail is arranged along the axial direction of the shielding cable, and the pulling and stripping driving element can drive the carding needle punching assembly to axially move along the shielding cable by the pulling and stripping sliding block. In the processing device, the needle tip parts of the carding needles are punched into the shielding layer woven by metal wires in the whole circumferential direction and then axially move along the shielding cable, so that the metal wires woven together can be easily scattered; and compared with an existing wheel brushing mode, the processing device has the characteristics of short dispersing time and high efficiency.

The invention discloses a self-propelled model board trolley construction method adopted in a large-span subway tunnel second-liner arch apex. Before double-side-wall pioneer drift method secondary lining construction, concrete at the joint of a temporary support and a primary-support structure is removed at first, and the three-step approach of inverted arch heading, side wall following and archapex closing is adopted in secondary lining construction. According to inverted arch heading, median septum H-steel at the bottom of the inside of an inverted arch construction section is locally dismantled during inverted arch construction, and then the inverted arch construction is conducted. According to side wall following, a horizontal part medium partition plate inside a side wall construction section is locally dismantled when a side wall within the inverted arch range is constructed. According to arch apex closing, an arch apex within the side wall range is constructed. By adoption ofthe self-propelled model board trolley construction method adopted in the large-span subway tunnel second-liner arch apex, the risks like structural distortion, ground surface settlement and tunnel unstability caused by high-risk large-span subsurface tunnel secondary lining construction under complicated geological conditions are eliminated.

The invention discloses a direct-current circuit breaker and an application method thereof. The direct-current circuit breaker is characterized in that a through-current branch circuit is connected in series into a power line; a controlled power supply unit is connected with the through-current branch circuit, an oscillation branch circuit and a grounding unit; and an energy consumption branch circuit can be connected with the main through-flow branch circuit in parallel and can also be connected with the oscillation branch circuit. When the power line does not have a fault, the through-flow branch circuit conducts a direct-current load current, a direct-current system pre-charges the oscillation branch circuit and the controlled power supply unit, and the oscillation branch circuit realizes self-energy taking; and when a short-circuit fault occurs in the power line, the oscillation branch circuit generates an oscillation current which is equal to a fault current in amplitude and opposite to the fault current in direction by controlling the operation states of the controlled power supply unit and the through-flow branch circuit, so that the through-flow branch circuit is reliably turned off, the amplitude of an injection current is improved by adopting a controlled active oscillation boosting principle, and arc extinguishing on-off of the through-current branch circuit is realized.

The invention provides a solid beverage prepared from soluble component extracts obtained from pollen, which comprises the following raw materials in percentage by weight: 5-30% of pollen soluble component extracts and 70-95% of auxiliary materials, wherein the pollen soluble component extracts contain 29.7-33.1% of proteins, 5.4-6.3% of fatty substances, 0.2-0.4% of polyphenol and 40.1-43.6% of total sugar. The prepared solid beverage contains abundant nutritional components and is high in effective component content.

An apparatus for controlling an electric switching device (1) for alternating current arranged in a current path for opening the switching device and for breaking the current in the current path after occurrence of a fault current comprises members (15) adapted to detect the current in the current path and a unit (20) adapted to control the electric switching device to break the current in the current path directly after a half wave of the alternating current having a peak value below a predetermined current limit value, so that the breaking is completed through a zero-crossing of the alternating current terminating a said half wave.

The invention provides a permanent magnet vacuum circuit breaker and an air inflation cabinet. The permanent magnet vacuum circuit breaker comprises a drive rod, an insulating pull rod, a connecting rod assembly, a flexible connecting piece, a vacuum arc-extinguishing chamber and a wire incoming terminal which are arranged in sequence along the straight line, wherein the insulating pull rod is connected with the drive rod; the connecting rod assembly is connected with the insulating pull rod; a contact spring is arranged on the connecting rod assembly in a sleeving mode; a positioning hole isformed in the flexible connecting piece in a penetrating mode; the connecting rod assembly passes through the positioning hole; the contact spring abuts between the flexible connecting piece and the connecting rod assembly; the vacuum arc-extinguishing chamber is internally provided with a movable contact and a static contact; the movable contact is connected with the connecting rod assembly; themovable contact can move relative to the static contact; the movable contact and the static contact can be connected separately; and the wire outgoing terminal is electrically connected with the static contact. Through the devices arranged in sequence along the straight line, the realized miniaturized permanent magnet circuit breaker can provide quicker break time and breaking capacity for the airinflation cabinet.

Disclosed is a non-polarized low-voltage circuit breaker, relating to the technical field of electrical switches. The non-polarized low-voltage circuit breaker includes an operating mechanism, two static contact assemblies, a bridge type moving contact assembly and two arc extinguishing chambers. The bridge type moving contact assembly is arranged opposite to the static contact assemblies. The twostatic contact assemblies are input and output static contact assemblies. The bridge type moving contact assembly and the two static contact assemblies are cooperated to form a left moving and staticcontact fracture and a right moving and static contact fracture. The left and right moving and static contact fractures are closely adjacent to the matched arc extinguishing chambers. When a circuitis switched on and off, arc is formed between the left and right moving and static contact fractures and generated self-excited magnetic fields repel each other since the current directions of the arcare opposite to drive the arc at the left and right fractures to automatically enter the two arc extinguishing chambers to realize arc extinguishing. The circuit breaker has two switch fractures andtwo arc extinguishing chambers, the two switch fractures are connected in series, arc energy produced when the circuit is opened is born by the two fractures, and arc extinguishing is born by the twoarc extinguishing chambers, so that the circuit breaker is favorable for rapid arc extinguishing.

The invention discloses an FPGA loading method based on a ZYNQ chip. The FPGA loading method comprises the steps of power-on automatic loading during power-on starting and upper computer control loading after a ZYNQ system is started; the power-on automatic loading process is as follows: when the equipment is powered on and started, the loading mode of the FPGA is defaulted to be active loading, and at the moment, the FPGA actively reads a file from Flash2 and rapidly loads the file; the upper computer control loading process comprises the steps that after the ZYNQ system runs, a control daemon process automatically runs, a network port is monitored, and an upper computer command is responded; the upper computer establishes communication with the ZYNQ system by using a network port, a serial port and the like, and issues an FPGA code to be updated; the ZYNQ system receives the data, stores the data in a DDR3 memory, verifies the data and feeds back a verification result to the upper computer; and the ZYNQ system determines an equipment updating mode according to an instruction of the upper computer. The FPGA loading method based on the ZYNQ chip, provided by the invention, has the characteristics that the FPGA is quickly and conveniently updated, and the interruption working time of equipment is short.

The invention discloses a nanometer organic boron cross-linking agent as well as a preparation method and application thereof, belonging to the technical field of chemical additives. According to the invention, nanometer silicon dioxide is adopted as a carrier, an amino silane coupling agent is grafted on the surface of the nanometer silicon dioxide, boric acid groups are grafted by taking the amino silane coupling agent as a bridge, and the boric acid groups are from boric acid ester. When the nanometer organic boron cross-linking agent provided by the invention is added into a fracturing fluid, the use amount of a guar gum thickening agent in the fracturing fluid can be effectively reduced, and the nanometer organic boron cross-linking agent has no pH value limitation requirement and has the characteristics of short gel breaking time, full gel breaking and the like.

The invention relates to a directional purging system and method. The directional purging system comprises a reversing valve and a purging device, wherein the reversing valve comprises a gas connecting pipe orifice, a smoke connecting pipe orifice and a burner front pipe joint; the purging device comprises a purging joint and a purging pipe connected in sequence; and the purging joint is connectedto a valve body of the reversing valve, and communicates with the burner front pipe joint. The method comprises the following steps: before the reversing valve enables a burner front pipe to enter asmoke discharge state from gas input, the purging device is started; purging gas is introduced in the purging device to purge the burner front pipe; and when purging is finished, the reversing valve actuates a reversing action, so that the burner front pipe is changed to the smoke discharge state. Residual gas in pipes at each time of purging can be purged into a hearth, so that the CO content inthe smoke is greatly reduced, and the purposes of fuel saving and environmental protection are achieved.

The invention discloses an active oscillation type direct-current circuit breaker and an application method thereof. The direct-current circuit breaker comprises a through-flow branch circuit, an oscillation branch circuit and an energy consumption branch circuit, wherein the through-flow branch circuit is connected with the oscillation branch circuit in parallel, the energy consumption branch circuit is connected with the through-flow branch circuit in parallel, or the energy consumption branch circuit is connected with internal elements of the oscillation branch circuit, and when a direct-current system does not fail, the oscillation branch circuit is locked, and the through-flow branch circuit conducts a direct-current load current. When a breaking command is received, the operation states of internal elements of the oscillation branch circuit and the through-flow branch circuit are controlled, so that the oscillation branch circuit generates oscillation current of which the amplitude is rapidly increased until the oscillation current and the short-circuit current are equal in amplitude and opposite in direction, and the through-flow branch circuit is reliably switched off; therefore, the problems of large reignition risk, obvious system oscillation, relatively high equipment cost and the like during small-current switching-off are solved, and large-scale popularization and application of the direct-current circuit breaker in a direct-current power transmission and distribution system can be realized.

The invention discloses a permanent magnet vacuum circuit breaker which comprises a circuit breaking unit and a bearing device used for installing the circuit breaking unit, the circuit breaking unit comprises a permanent magnet mechanism, an insulating part, a connecting assembly, a contact pressure spring, a conducting strip, a vacuum arc-extinguishing chamber, a switch static contact and a synchronizing assembly, and the permanent magnet mechanism comprises a movable core iron pull rod and a dustproof cover used for protecting the movable core iron pull rod. The connecting assembly comprises a first connecting rod, the movable core iron pull rod and the first connecting rod are each provided with a milled flat structure, the synchronizing assembly comprises a synchronizing shaft, a transmission pin, a synchronizing base and a synchronizing contact arm, and the synchronizing base guides the synchronizing shaft and the transmission pin. According to the permanent magnet vacuum circuit breaker, a direct driving design is adopted, many transmission links are reduced, the energy consumption is reduced, and the transmission efficiency is ensured to the maximum extent. The permanent magnet vacuum circuit breaker disclosed by the invention is designed to be integrally miniaturized, so that the reliability of an on-off circuit of a gas insulated switchgear can be improved, and shorter on-off time can be obtained.

The invention provides a method for quickly separating aloe polysaccharide from the aloe. The method comprises the following steps that plant raw materials containing the aloe polysaccharide are cut into thin slices, and are dried for 1-24 h at 20-60 DEG C to obtain dried aloe; then after an appropriate amount of an alkali aid is added, a grinding ball with a grinding ball filling rate of 5-50% isadded, mechanical ball grinding pretreatment is conducted for 5-60 min to obtain dried aloe powder, then an extraction solvent is added at the feed liquid ratio of 1:5 to 1:50, ultrasonic extractionis conducted for 5-60 min at 20-80 DEG C, 70-99% of ethanol is added for precipitation to obtain the aloe polysaccharide, wherein the alkali aid is NaOH, Na2CO3 or NaCO3; and the plant raw materials containing the aloe polysaccharide comprise aloe plants of liliaceae.

The invention relates to an arc extinguish chamber and a tank-type circuit breaker. The arc extinguish chamber comprises: a moving contact assembly, which comprises a moving contact base and a nozzle, wherein the nozzle can reciprocate in the moving contact base; a static contact assembly which comprises a static contact base, a static support and a static arc contact, wherein the static arc contact is assembled in the static contact base in a guiding and sliding manner, and a rotating shaft is arranged on the inner side wall of the static support; a connecting rod mechanism which comprises a movable end connecting rod, a static end connecting rod and a rotating arm, wherein the rotating arm is rotationally assembled on the rotating shaft, the rotating arm is provided with a long section and a short section, one end of the movable end connecting rod is hinged to the nozzle, the other end of the movable end connecting rod is hinged to the long section, one end of the static end connecting rod is hinged to the static arc contact, and the other end of the static end connecting rod is hinged to the short section; and a plane which passes through the center line of the static contact base and is parallel to the hinge axis of the movable end connecting rod and the long section is defined as a reference plane, and the rotating axis of the rotating arm and the hinge axis of the static end connecting rod and the short section are located on the same side of the reference plane.

The invention discloses a vacuum arc extinguishing chamber employing an external rotation magnetic field and a DC cutoff method of the vacuum arc extinguishing chamber, and belongs to the field of a power system circuit breaker. The vacuum arc extinguishing chamber comprises a vacuum arc extinguishing chamber and a plurality of external coil units. The cutoff method comprises the steps of 1) opening a contact of the vacuum arc extinguishing chamber to generate an arc when a fault occurs; 2) enabling currents with phase difference to pass through the plurality of pairs of coils externally arranged outside the vacuum arc extinguishing chamber to generate the rotation magnetic field; and 3) allowing the arc to move under an effect of the rotation magnetic field, rising an arc voltage to a system voltage, and extinguishing the arc so as to achieve cutoff.

The invention relates to a dialkyl urea type supramolecular thickening agent and a preparation method and application thereof. The preparation method comprises the following steps of: taking diisocyanate and alkylamine as reaction materials, carrying out an addition reaction to obtain a dialkyl urea thickening agent, wherein the alkylamine is 2-ethylhexylamine; and diisocyanate is 2, 4-toluene diisocynate or 2, 4 / 2, 6-toluene diisocynate. The thickening agent has good thickening performance on various alkanes, supramolecular aggregates can be formed in a non-polar solvent through intermolecular hydrogen bonds, and the supramolecular aggregates are further entangled to form a spatial network structure. Compared with the traditional cross-linking type fracturing fluid, the supramolecular hydrocarbon fracturing fluid prepared from the thickening agent does not need crosslinking, has excellent shear restorability and good sand carrying performance, can quickly break gel when mixed with stratum crude oil without adding a gel breaker, has the characteristics of short gel breaking time and no residue, and is particularly suitable for fracturing construction of low-permeability compact unconventional oil and gas reservoirs with serious water sensitivity.

The invention relates to a low-loss arc-free composite multifunctional DC contactor. The structure is as follows: an input anode bus in an external power circuit is simultaneously connected with one end of a protective capacitor C of an IGBT tube, a collector C of the IGBT tube and an input end of a contactor K; an output anode bus in the external power circuit is simultaneously connected with the other end of the protective capacitor C of the IGBT tube, a drain E of the IGBT tube and an output end of the contactor K; one end of a current and voltage transmitting circuit is connected with the input anode bus and the output anode bus in the external power circuit and the other end is connected with an AD sampling port of a microprocessor circuit; one end of a contactor drive circuit is connected with a contactor solenoid and the other end is connected with an end S1 of the microprocessor circuit; and two ports of one end of an IGBT tube drive circuit are connected with ends G and E of the IGBT tube respectively and the other end is connected with an end S2 of the microprocessor. The low-loss arc-free composite multifunctional DC contactor has the advantages of being free of an arc in breaking, short in break time, high in impact current resistance, low in loop loss, small in heat, small in size and the like.