903 results about "Vacuum arc" patented technology

The invention relates to the technical field of fault diagnosis, in particular to a pole-mounted circuit breaker fault diagnosis method based on multi-information fusion, and the method comprises the steps: firstly obtaining electric quantity modal data such as three-phase current and coil current and mechanical quantity modal data such as mechanism vibration and voiceprint, and constructing a time-frequency domain alignment feature tensor; then, through a graph space-time attention fusion model, deeply mining physical structure association and time sequence evolution laws among heterogeneous data, and generating a dynamic space-time feature matrix; then, respectively constructing a mechanical evidence body for representing the state of the transmission chain of the operating mechanism and an electrical evidence body for representing the working condition of the vacuum arc-extinguishing chamber by adopting a feature level-decision level mixed framework; an improved D-S evidence theory is applied for fusion, when high-conflict evidences are detected, a self-adaptive arbitration mechanism is automatically triggered, conflict weights are dynamically attenuated or distributed to uncertain items, misjudgment is effectively avoided, and high-robustness collaborative diagnosis of the electromechanical state is achieved.

The invention belongs to the technical field of circuit breakers, and particularly relates to a pole-mounted vacuum circuit breaker with a visualized open circuit state. Comprising a box body, the top of the box body is fixedly provided with a plurality of vacuum arc-extinguishing chambers, the top of each vacuum arc-extinguishing chamber is fixedly connected with an upper conducting rod, one side of each vacuum arc-extinguishing chamber is provided with a lower conducting rod, and the upper conducting rods and the lower conducting rods are used for connecting lines; an operating mechanism and an executing mechanism are installed in the box body, the operating mechanism comprises a first driving rod, and the first driving rod is rotationally connected with the side wall of the box body; visualization of transmission in the box body is achieved, the maintenance efficiency is improved, and the maintenance cost is reduced; whether the upper contact and the lower contact are opened or closed can be clearly judged, quick opening and closing operation can be carried out in an auxiliary mode, and generation of electric arcs caused by low opening and closing speed is prevented; meanwhile, emergency opening and closing operation can be carried out when the circuit breaker breaks down so as to deal with emergency situations.

The invention discloses a side-mounted vacuum circuit breaker, which comprises a vacuum arc-extinguishing chamber, an operating mechanism and a side-mounted fixing piece, and is characterized in that the vacuum arc-extinguishing chamber is connected to the rear side of the operating mechanism through the side-mounted fixing piece; the operating mechanism comprises a box body, a spring, a main shaft, a second intermediate gear and a second lower driving gear, the spring, the main shaft, the second intermediate gear and the second lower driving gear are mounted in the box body, the main shaft is linked with an insulating pull rod of the vacuum arc-extinguishing chamber through a transmission mechanism, and the spring is connected to one end of the main shaft; the second intermediate gear is sleeved on the main shaft; the second lower driving gear is meshed with the second intermediate gear; a circle of gear teeth are distributed on the side face of the second intermediate gear, and the reference axis formed by the circle of gear teeth coincides with the reference axis of the second intermediate gear. An upper driving gear and a secondary transmission gear in the box body are omitted, an external second energy storage motor is adopted, the number of disassembly and assembly steps is smaller, and the maintenance efficiency is higher.

The invention belongs to the technical field of vacuum contactors, and particularly relates to a vacuum contactor with a water cooling mechanism, which comprises a cooling structure, the cooling structure comprises a shell formed by mutually matching, combining and splicing a first shell and a second shell, and the shell is sleeved outside a ceramic body at a contact part of a vacuum arc extinguish chamber of a contactor body. And a cooling cavity formed between the inner wall of the shell and the upper outer wall of the ceramic body at the contact part of the vacuum arc-extinguishing chamber is divided into a spiral cooling cavity by a spiral partition plate. According to the invention, a wrapping shell is formed outside the ceramic body at the contact part of the contactor by using the two combined shells, and a spiral cooling cavity for injecting the cooling liquid is formed between the shell and the ceramic body, so that heat exchange and cooling are performed after the cooling liquid is injected, and the temperature at the contact part is rapidly reduced; and meanwhile, cooling liquid cooling can be carried out by adopting two modes of cooling liquid soaking and atomization spraying, so that stable and effective cooling is realized, and long-time stable operation and use of the contactor are ensured.

The invention belongs to the technical field of circuit breakers, particularly relates to a vacuum arc extinguish chamber replacement mechanism and a calibration structure of a primary and secondary fusion pole-mounted circuit breaker, and provides the following scheme aiming at the problems that an existing vacuum arc extinguish chamber is relatively tedious to mount and dismount and the moving stroke calibration efficiency of a moving contact is low: the vacuum arc extinguish chamber replacement mechanism comprises a circuit breaker body; a plurality of shells are fixed at the top of the circuit breaker body, arc extinguish chambers are placed in the shells, and a plurality of movable conducting rods extending into the shells penetrate through the top of the circuit breaker body in a sliding manner; according to the invention, the lifting of the lifting rods is controlled through the cover plate, so that the installation and disassembly of the arc extinguish chamber can be completed synchronously, the operation is simple, and the connection stability of the moving contact and the static contact at the two ends of the arc extinguish chamber can be ensured in the installation process. The lifting touch panel is controlled to ascend and descend through cooperation of the rotating rod and the lead screw, and the lifting distance of the lifting touch panel is controlled in real time through cooperation of the laser sensor.

The present invention belongs to the technical field of circuit breakers, especially the vacuum arc extinguishing chamber replacement mechanism and calibration structure of the primary-secondary integrated pole-mounted circuit breaker. Aiming at the problems of the cumbersome installation and disassembly of the existing vacuum arc extinguishing chamber and the low calibration efficiency of the moving stroke of the moving contact, the following scheme is proposed. It includes a circuit breaker body, and a plurality of shells are fixed on the top of the circuit breaker body. The inside of the shell is used to place the arc extinguishing chamber. A plurality of moving conductive rods that slide through the top of the circuit breaker body and extend into the shell are provided; it also includes two lifting rods that slide on the inner walls of the two sides of the shell away from each other. In the present invention, by controlling the lifting of the lifting rods through the cover plate, the installation and disassembly of the arc extinguishing chamber can be completed synchronously. The operation is simple, and the connection stability of the moving and static contacts at both ends of the arc extinguishing chamber can be ensured during the installation process. In addition, by the cooperation of the rotating rod and the lead screw, the lifting touch plate is controlled to lift, and the lifting distance of the lifting touch plate is grasped in real time with the cooperation of the laser sensor.

The invention relates to a closing buffer of a vacuum circuit breaker. The closing buffer comprises phase columns, a cross beam, a spring operating mechanism and a bracket, the three phase columns are arranged at the top end of the cross beam in parallel, and the top end of the support is connected to the lower surface of the cross beam and used for supporting the cross beam. The spring operating mechanism is mounted on the lower surface of the cross beam, and the spring operating mechanism is linked with the vacuum arc extinguish chamber in the phase column through a transmission module; through specially designed guiding and spring contact force values, functional requirements of guiding and contact pressure providing are realized. A closing buffer is additionally arranged in the spring contact, damping of a rigid closing point is increased through the buffer, energy of collision bounce of the rigid closing point is absorbed, and therefore bounce is restrained.

The invention discloses a method for identifying an arcing mode of a vacuum arc based on deep learning. The method comprises the following steps: S1, acquiring an arcing mode image sequence; s2, establishing a deep learning network and obtaining a network training model; s3, inputting an arc image needing to be identified into the training model for identification; the deep learning network selects an improved GoogleNet network in a convolutional neural network, and the improved Googlenet network structure comprises an input layer, an initial convolutional layer, a pooling layer, an inception module, an auxiliary classifier, a global average pooling layer, a Dropout layer, a full connection layer, a softmax layer and an output layer which are connected in sequence; the vacuum arc identification method based on deep learning mainly aims at solving a series of problems that in the prior art, arcing experiments have a large amount of data including arc dynamic images shot by a high-speed camera, and manual identification is long in time consumption, low in efficiency, high in subjectivity and the like.

The invention relates to the field of electrical equipment monitoring, in particular to an intelligent online monitoring method and system for a high-voltage vacuum circuit breaker, and the method comprises the steps: receiving a circuit breaker control signal, and carrying out the electromagnetic pushing operation of a moving contact transmission rod through a started electromagnetic coil, thereby obtaining a motion transmission rod; monitoring the motion transmission rod based on a preset monitoring frequency and a displacement sensor, performing speed analysis on a displacement time sequence to obtain a displacement fluctuation index and an average displacement speed, calculating a displacement failure rate according to the displacement fluctuation index and the average displacement speed, and if the displacement failure rate is smaller than or equal to a displacement failure threshold value, determining that the motion transmission rod does not have the displacement failure. If yes, a piezoelectric sensor, an ionization sensor and a thermal conductivity sensor are used for executing vacuum inspection operation on the vacuum arc extinguish chamber, an arc extinguish vacuum index is obtained, and when the circuit breaker monitoring platform receives a safety signal or an early warning signal, online monitoring of the high-voltage vacuum circuit breaker is completed. The real-time performance and the accuracy of monitoring the high-voltage vacuum circuit breaker can be improved.

The invention belongs to the technical field of research and development of fast neutron reactor jackets and structural materials, and particularly relates to a high-temperature-lead-bismuth-corrosion-resistant high-silicon-content ferrite / martensite steel ladle tube and a preparation method thereof. According to the mass percentage, the composition mainly comprises the following components: 0.16-0.24% of C; 0.4 to 0.8 percent of Mn; cr: 11.6% to 12.4%; 1.2 to 1.8 percent of W; 0.1 to 0.4 percent of Ta; 0.2 to 0.4 percent of V; 1.0%-1.8% of Si and Fe. The preparation method comprises the steps of vacuum induction and vacuum arc remelting. Carrying out homogenization treatment and forging; extruding and annealing; cold rolling and annealing; and performing normalizing and tempering treatment. Through an efficient short-flow process route and reasonable smelting, pipe machining deformation and heat treatment processes, the microscopic structure of the material is remarkably improved, then the mechanical property and high-temperature lead and bismuth corrosion resistance of the finished pipe are improved, and the use requirement of the lead and bismuth cooling fast reactor fuel assembly cladding material under the high-temperature working condition is met.

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

The invention discloses a method for preparing titanium-aluminum alloy powder based on a plasma rotating electrode atomization method, and relates to a preparation method of titanium-aluminum alloy powder. The method aims at solving the technical problems that titanium-aluminum alloy powder prepared through an existing method is uneven in particle size, poor in sphericity degree and high in oxygen content, and comprises the steps that firstly, metal raw materials are weighed according to the target titanium-aluminum alloy chemical component proportion, and a uniform cast ingot is obtained through smelting of a vacuum arc smelting furnace; processing the cast ingot into an electrode bar with a smooth surface, mounting the electrode bar on plasma rotating electrode atomization equipment, enabling the electrode bar to rotate at a high speed, melting alloy at the end part of the electrode bar by utilizing a plasma beam generated by a plasma generator, atomizing the alloy into liquid drops under the action of centrifugal force, and cooling and solidifying the liquid drops in a high-purity argon protection atmosphere to form powder; and finally, the powder is collected and screened, finished powder is obtained, the sphericity degree of the powder reaches 95% or above, the oxygen content is lower than 500 ppm, particle size distribution is uniform, and the powder can be used in the fields of aerospace, the automobile industry, energy and the like.

The invention relates to the technical field of high-voltage electric appliance detection, in particular to a device and method for detecting the vacuum degree of a vacuum arc-extinguishing chamber, and the method comprises the steps: arranging a field emission cathode on one metal end cover of the vacuum arc-extinguishing chamber; an anode is arranged on the metal shielding cover close to the field emission cathode in the vacuum arc-extinguishing chamber; the high-voltage direct-current power supply is connected to the field emission cathode and the anode and is used for applying voltage to the electrodes so as to drive the field emission cathode to emit electron beams to impact the anode; the X-ray energy spectrum detector directly faces the anode, the X-ray energy spectrum detector is used for measuring bremsstrahlung X-ray energy spectrum generated when the electron beam impacts the anode, an electron emission source is actively arranged in the arc extinguish chamber, and the distribution of the X-ray energy spectrum generated by the electron emission source is measured. And high signal-to-noise ratio, high-precision and high-sensitivity vacuum degree quantitative detection is realized by utilizing the strong correlation between the energy spectrum form and the internal gas pressure.

The utility model discloses a 12kV primary fusion type environment-friendly intelligent circuit breaker, and belongs to the technical field of electricity and electric power. Comprising a support, a sealing shell and two sets of wire inlet sleeves and wire outlet sleeves arranged at the top of the sealing shell, the wire outlet sleeves are located at the bottoms of the wire inlet sleeves, the wire outlet sleeve on one side is connected with an isolation disconnecting link structure through a conductive contact finger and a conductive connecting lever, and the wire outlet sleeve on the other side is connected with a vacuum arc-extinguishing chamber structure through a sensor module and a conductive arm. The vacuum arc-extinguishing chamber structure is connected with the isolation switch structure through an interlocking device. The utility model has the advantages of high reliability, long service life, environmental protection property, high performance, one-time integration miniaturization, intelligence, simple installation and maintenance and the like, plays an important role in an electric power system, not only improves the operation efficiency and safety of the electric power system, but also promotes the green, low-carbon and sustainable development of the electric power system.

The invention relates to a primary and secondary fusion complete column-mounted circuit breaker, which comprises a circuit breaker body, a column mounting frame, a voltage transformer, an electronic sensor, a drop-out fuse and a controller, and is characterized in that the circuit breaker body is provided with an operation base and a plurality of solid-sealed polar poles arranged on the operation base; a vacuum arc-extinguishing chamber is arranged in the upper end of a vertical section of the solid-sealed polar pole, a connecting wire extending horizontally is arranged in a transverse section of the solid-sealed polar pole, opening and closing of the vacuum arc-extinguishing chamber are driven by an operation base, and the solid-sealed polar pole further comprises a limiting assembly arranged in the solid-sealed polar pole and a conductive linkage assembly arranged in the limiting assembly. The conductive wire connecting assembly is arranged in the limiting assembly, and the accelerating assembly is arranged in the limiting assembly and located below the mounting sleeve, so that the opening speed is accelerated. The beneficial effects of the invention lie in that the linkage assembly connected with the movable conducting rod and the driving rod realizes switching-on power-on and switching-off power-off, and can also cooperate with the acceleration assembly so as to accelerate the switching-off speed.

The invention relates to a pole-mounted circuit breaker monitoring method and system, electronic equipment and a medium. The method comprises the following steps: acquiring a voltage recovery waveform characteristic and a mechanical vibration characteristic during operation of a vacuum arc-extinguishing chamber, and performing timestamp alignment; calculating a contact gap conductive channel risk value based on the aligned waveform characteristics; generating breaking capacity attenuation trend characteristics by combining the historical breaking current peak value, the breaking times and the risk value; calculating the remaining service life according to the trend characteristics, and synchronously obtaining a fault probability value according to the conductive channel risk value; and finally, according to the residual service life and the fault probability value, determining a maintenance early warning level and outputting a maintenance early warning signal. Therefore, according to the method, the risk of the conductive channel is evaluated through fusion of the operation waveform and the mechanical signal, and the breaking capacity attenuation trend is extrapolated along the historical breaking data, so that online evaluation and advanced early warning of the health state of the pole-mounted circuit breaker are realized, and the operation reliability and the operation and maintenance efficiency of the key node of the power distribution network are improved.

The invention discloses a NH4H2PO4-CaCO3 modified high-performance AB2 type hydrogen storage alloy and a preparation method thereof. The chemical formula of the AB2 type hydrogen storage alloy is TiaZr (1-a-b) YbMnxCr (1.8-x) Fe (0.2), and the mass ratio of the AB2 type hydrogen storage alloy to NH4H2PO4 to CaCO3 is 98: 1: 1; the preparation method comprises the following steps: 1, selecting a metal elementary substance raw material; 2, performing vacuum arc melting to obtain an alloy ingot; 3, crushing and grinding the alloy cast ingot; and 4, drying the powder with NH4H2PO4 and CaCO3 powder, and then carrying out ball milling and mixing. According to the alloy, by controlling the content of Cr, Mn, Fe and Y elements, the activation performance at the room temperature is improved, the hydrogen absorption rate is increased, the hydrogen storage capacity is increased, NH4H2PO4 and CaCO3 are combined for modification, the spontaneous combustion tendency of hydrogen absorption state powder in air is reduced, and the alloy is suitable for the field of solid hydrogen storage.

An integrated vacuum circuit breaker, comprising: an insulating cylinder (100), in which a single-break vacuum arc-extinguishing chamber (110) is arranged, a static end portion of the single-break vacuum arc-extinguishing chamber being provided with a static end assembly, and a movable end portion of the single-break vacuum arc-extinguishing chamber being provided with a movable end assembly; an insulating cylinder mounting plate (200), which is connected to the insulating cylinder; a mechanism mounting plate (400); a support assembly, which is arranged between the insulating cylinder mounting plate (200) and the mechanism mounting plate; and a transmission structure, one end of the transmission structure passing through the mechanism mounting plate (400) so as to connect to an operating mechanism and be in sealed connection with the mechanism mounting plate (400), and the other end of the transmission structure being connected to the movable end assembly, wherein the operating mechanism drives the movable end assembly to move in an axial direction so as to push a movable conductive rod to come into contact with a static conductive rod in the single-break vacuum arc-extinguishing chamber to perform a closing action, or to pull the movable conductive rod to separate from the static conductive rod to perform an opening action. The present invention has the beneficial effects whereby integrated assembly can be realized, and the integrated vacuum circuit breaker can be directly mounted in a GIS after being pre-assembled, thereby reducing the installation time and the labor cost.

The utility model discloses a circuit breaker switch for gas insulation, which comprises a vacuum switch, a vacuum arc-extinguishing device and an isolating switch which are sequentially connected from top to bottom, the vacuum switch comprises a main shaft and a vacuum transmission part, the vacuum transmission part is respectively connected with the main shaft and the vacuum arc-extinguishing device, and the main shaft is connected with the vacuum arc-extinguishing device. The vacuum transmission component is arranged to be a multi-connecting-rod structure, the vacuum transmission component with multiple connecting rods and the main shaft are used for converting rotary motion output by the operating mechanism into linear motion, so that the vacuum arc extinguishing device is driven to perform breaking and closing actions in the linear direction to realize opening and closing, and compared with a conventional cam structure, the vacuum arc extinguishing device has the advantages that the structure is simple, and the operation is convenient. Compared with the prior art, the device is small in size, light in weight and large in stroke adjusting range, so that larger force is provided for the vacuum arc extinguish chamber to carry out closing and opening operation on the vacuum arc extinguish chamber, and the requirements of a 40.5 kV circuit breaker are met.

The invention discloses a super-fusion pole-mounted switch device, belongs to the technical field of switch devices, and discloses the super-fusion pole-mounted switch device which comprises a switch body, a power taking unit and a feeder terminal. The switch body comprises a deep fusion solid-sealed polar pole which is integrally poured, a vacuum arc extinguish chamber, an isolating switch contact and a voltage and current sensor are integrated in the switch body, and the electricity taking unit supplies power to the deep fusion solid-sealed polar pole through a separable spring electric contact structure; the feeder terminal is embedded in the switch box body and is operated in a hot-line mode through a special operating rod. The invention further provides a transient electromagnetic interference suppression module which is used for eliminating electromagnetic interference in the equipment. The CLC topological power taking unit can adapt to multiple working conditions; the state monitoring module is fused with multi-source data to diagnose faults, and the problems that an existing primary and secondary fusion column switch is low in fusion degree, weak in anti-electromagnetic interference, poor in electricity taking reliability and low in intelligence are solved. The equipment can supply power to the 10kV power distribution network intelligently, the reliability is improved, and the operation and maintenance cost is reduced.

The invention relates to the technical field of high-voltage switches, in particular to a vacuum arc extinguish chamber assembling and positioning tool which comprises a bottom plate and a top plate, the bottom plate is provided with a spigot used for positioning the static end of an arc extinguish chamber, at least three guide columns are arranged with the spigot as the center, the upper ends of the three guide columns are connected with the top plate, and the lower ends of the three guide columns are connected with the top plate. A positioning plate is arranged on the top plate, a positioning rod used for positioning the moving end of the arc extinguish chamber is arranged on the positioning plate in the direction facing the bottom plate, a porcelain shell positioning device capable of moving up and down along the guide columns is arranged on each guide column, and each porcelain shell positioning device comprises a measuring base matched with the corresponding guide column. The measuring base is movably provided with extension scales used for abutting against the peripheral face of the porcelain shell, and intersection points of extension lines of the extension scales intersect on the center line of the spigot. The device can guarantee accurate positioning and uniform gaps in the circumferential direction when the external porcelain shell is in butt joint; the device is simple in structure, convenient to mount and dismount and high in adaptability.

The invention relates to the technical field of pole-mounted circuit breakers, in particular to an intelligent pole-mounted circuit breaker which comprises a vacuum arc extinguishing mechanism, the vacuum arc extinguishing mechanism comprises an airtight insulation shell, an arc extinguishing chamber, a buffer chamber, a movable chamber, a static contact, a movable contact, a tower-shaped spring and a buffer column, and the arc extinguishing chamber, the buffer chamber and the movable chamber are arranged in the airtight insulation shell from top to bottom. The static contact and the moving contact are arranged in the arc extinguish chamber, the tower-shaped spring is installed at the top end of the buffer chamber, and the buffer column is arranged in the buffer chamber. The second lifting shaft and the buffer column move synchronously and are limited by the conical surface to stop, the tower-shaped spring is compressed, and first buffering is achieved; and the buffer solution is extruded to the damping hole and overflows into the reserved groove, so that the moving contact gets close to the static contact at a uniform speed, the static contact is connected with the moving contact after the buffer solution stops overflowing, and secondary buffering is completed through constant resistance of the buffer solution.

The utility model relates to a vacuum load switch for preventing closing rebound of a vacuum arc-extinguishing chamber. The vacuum load switch includes: a support frame; a drive mechanism movably mounted to the support frame and movable in response to an outer partial closing or closing action; the contact knife assembly comprises a static contact knife and a movable contact knife which are fixedly installed on the supporting frame and the driving mechanism respectively, and the movable contact knife can be driven by the driving mechanism to be connected with or disconnected from the static contact knife; the transmission mechanism is movably mounted on the supporting frame and can be driven by the driving mechanism to move; the vacuum arc-extinguishing chamber is fixedly arranged on the supporting frame and is connected to the transmission mechanism, so that the transmission mechanism controls the opening and closing of the vacuum arc-extinguishing chamber; and the limiting piece is fixedly mounted on the driving mechanism and is obliquely arranged relative to the movable contact knife, so that when the driving mechanism is switched on in place, the limiting piece can abut against the transmission mechanism to prevent the transmission mechanism from moving reversely.

The invention provides a high-capacity generator circuit breaker heat dissipation structure based on liquid metal heat dissipation and a working method, and the structure comprises a vacuum arc-extinguishing chamber heat dissipation device, a liquid metal diversion pipeline, and a liquid metal cooling circulation system. The vacuum arc-extinguishing chamber heat dissipation devices are arranged on the two sides of the vacuum arc-extinguishing chamber; the end part of the liquid metal flow guide pipeline is communicated with a liquid metal cooling circulation system; the vacuum arc-extinguishing chamber heat dissipation device is internally provided with heat dissipation fins; and the liquid metal flow guide pipeline is embedded in the radiating fins. The overall heat dissipation capability of the circuit breaker is improved by introducing the liquid metal, the heat dissipation structure of the vacuum arc-extinguishing chamber timely exports heat generated by the vacuum arc-extinguishing chamber, the heat is finally exported to the outside of the circuit breaker through circular flow of the liquid metal, the steady-state temperature rise during operation of the circuit breaker can be effectively reduced, and the service life of the circuit breaker is prolonged. The method is of great significance in improving the capacity of the generator circuit breaker and ensuring safe and reliable operation of the circuit breaker.

The invention relates to the technical field of PVD coating, in particular to a PVD vacuum coating machine which comprises a vacuum machine pump set, the top end of the vacuum machine pump set is fixedly connected with a fixing table, and the top end of the fixing table is fixedly connected with a vacuum coating tank; and the workpiece placing and rotating mechanism comprises a motor fixedly connected to the inner top wall of the vacuum machine pump set, the output end of the motor is fixedly connected with a rotating plate, and a supporting frame is detachably arranged at the top end of the rotating plate. In the detection assembly, when gas containing plating materials passes through a detection box, light rays emitted by a lamp panel can be shielded and absorbed, a photoresistor board detects the light ray intensity change, converts the light ray intensity change into electric signals and transmits the electric signals to a PLC, the PLC controls the power of an evaporation source, a motor and a vacuum arc ion source according to the signals, and therefore self-adaptive adjustment of parameters is achieved. And parameters are adaptively adjusted according to actual conditions, so that plating material supply is accurately matched with actual requirements.

The invention relates to the field of circuit breakers, and provides a circuit breaker which comprises an insulating shell and a pull rod mechanism, a power connection end is arranged on the side face of the insulating shell, the circuit breaker further comprises a first capacitor and a second capacitor, and the first capacitor is arranged in the insulating shell and electrically connected with a first conductive metal body of the power connection end; the second capacitor is arranged in the insulating shell, a second conductive metal body electrically connected with the second capacitor is arranged at the end part of a moving contact of the vacuum arc-extinguishing chamber of the insulating shell, and a first interface and a second interface are arranged on the side wall or the end part of the insulating shell. The circuit breaker is connected for use, and the power connection end is connected with external detection or feedback equipment, so that the working state of the circuit breaker is monitored and fed back in real time. When the circuit breaker is disconnected, the first capacitor and the second capacitor can be used for detection so as to determine whether the interior of the circuit breaker is completely powered off, that is, no residual voltage exists on the power connection end and the moving contact part, so that safe and reliable operation is ensured.

The invention discloses a short-circuit current self-driven fast switch and a design and control method thereof, the short-circuit current self-driven fast switch comprises a vacuum arc-extinguishing chamber, an electromagnetic holding mechanism, an electromagnetic repulsion mechanism and a controller which are connected in parallel on a tested system, and the vacuum arc-extinguishing chamber is connected in parallel with a current limiting reactor connected on the tested system; the electromagnetic holding mechanism comprises a second current transformer of which the primary side is coupled with the tested system, a rectifying circuit connected in series with the secondary side of the second current transformer and a driving coil connected in series with the rectifying circuit, the driving coil is aligned with an armature of the vacuum arc-extinguishing chamber, and an air gap is formed between the armature and the driving coil; and the driving coil is arranged in the shell made of a ferromagnetic material. The invention aims to provide the short-circuit current self-driven quick switch, so that the current-limiting reactor can act immediately and can act for multiple times in a short time when the short-circuit current self-driven quick switch has a system short-circuit fault under any condition.

The invention provides a vacuum circuit breaker contact abrasion real-time monitoring and early warning method and system, and relates to the technical field of electric power system breakers, and the method comprises the steps: monitoring a pressure change signal between vacuum contact assemblies through a pressure monitoring sensor installed in a vacuum arc extinguishing chamber of a vacuum circuit breaking device; performing signal conversion processing on the pressure change signal to generate corresponding contact wear monitoring data; when the contact wear monitoring data meets a preset early warning trigger condition, starting a contact wear early warning mechanism of the vacuum circuit breaker; constructing a contact residual life prediction model corresponding to the vacuum contact assembly, and determining a contact residual life prediction value of the vacuum contact assembly according to the contact wear monitoring data based on the contact residual life prediction model; and when the predicted value of the residual life of the contact meets the preset replacement triggering condition, a contact abrasion replacement mechanism of the vacuum circuit breaker is started, so that real-time monitoring and early warning of the contact abrasion condition can be realized, and the stability and reliability of a power system are improved.

The invention discloses an antibacterial magnetic compatible medical beta-type Zr-Nb-Cu alloy and a preparation method thereof. The alloy is prepared from, by mass, 18%-24% of Nb, 4%-10% of Cu and the balance Zr and inevitable impurity elements. The preparation method of the alloy comprises the following steps: 1, weighing sponge zirconium, copper and niobium particles as raw materials; 2, putting the raw materials into a water-cooled copper crucible, vacuumizing, introducing argon, and smelting in a non-self-consumption vacuum arc furnace; according to the beta-type Zr-Nb-Cu alloy, alloying elements Nb and Cu are selected, the strength, hardness, abrasion resistance and corrosion resistance of the alloy are improved while the elasticity modulus of the alloy is reduced, the lasting and efficient antibacterial performance of the alloy is guaranteed, the influence of postoperative bacterial infection and MRI detection artifacts is remarkably reduced, and therefore the beta-type Zr-Nb-Cu alloy has the lower elasticity modulus and magnetic susceptibility, and the service life of the alloy is prolonged. And the method is more suitable for human skeleton and nuclear magnetic resonance (MRI) detection.

The invention discloses a design method and a preparation method of low-melting-point high-entropy liquid metal GaInSnBiZn, and belongs to the field of alloy research and development. The liquid metal alloy is formed by mixing five metal elements including Ga, In, Sn, Bi and Zn according to the equal atomic proportion, and aims at avoiding formation of intermetallic compounds and optimizing the microstructure through the high-entropy effect, and low melting point, high stability and good mechanical property of the alloy are achieved. The mixing enthalpy of the binary alloy and the formation enthalpy of the ternary alloy are calculated, thermodynamic analysis and phase diagram research are combined, the proportion of the five elements is determined, the high-entropy alloy is prepared through a vacuum arc melting method under the high vacuum condition, and the high purity and stability of the high-entropy alloy are ensured. The liquid alloy is low in melting point and high in stability, theoretical guidance and technical support are provided for design and preparation methods of novel liquid metal materials, some limitations in the prior art are overcome, and the liquid alloy has high practical application value.