1902 results about "Arc extinction" patented technology

The invention discloses a high-voltage circuit breaker arcing monitoring system and method, and relates to the technical field of power equipment operation state detection, and the method comprises the following steps: S1, synchronously collecting arcing spectral signals and electromagnetic interference vector data under a unified time reference, and carrying out primary differential processing to generate stable base plane signals; s2, inputting the stable base plane signal into the interference identification model, generating a multi-dimensional spectrogram through time-frequency mapping, extracting an interference time sequence boundary, and outputting an interference weight matrix; the arcing monitoring method based on spectrum and electromagnetic signal synchronous acquisition is constructed, interference identification, signal purification, energy analysis and control instruction generation are fused, parameter self-optimization is realized through closed-loop feedback, the arcing identification accuracy and the arc quenching response efficiency are effectively improved, and the arcing monitoring method is suitable for large-scale popularization and application. And the operation safety and the intelligent level of the circuit breaker in a strong interference environment are enhanced.

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 relates to the field of vacuum circuit breakers, in particular to a vacuum circuit breaker opening and closing dynamic characteristic calculation method, device and equipment and a medium. Establishing a three-dimensional geometric model of the pole-mounted vacuum circuit breaker arc extinguish chamber and the moving and static contacts; setting material attributes for each part in the three-dimensional geometric model; constructing a multi-physics field coupling system; the area where the moving contact is located is divided into movable grids, and the grid density of the moving contact and the grid density of the static contact dynamically change along with time; and performing multi-field coupling transient solution according to the three-dimensional geometric model, the multi-physical field coupling system and the movable grid to obtain the dynamic characteristics of the vacuum circuit breaker. The electromagnetic field, the thermal field, the fluid field, the structure field and the circuit are subjected to full coupling analysis, multi-physical field strong coupling dynamic simulation of the whole opening and closing process is achieved, and the dynamic characteristics of the whole opening and closing process can be accurately calculated.

The invention relates to the technical field of electric power system control, and discloses an electric power system arc harmonic collaborative suppression and intelligent closed-loop control system, which comprises the steps of: acquiring sensor data and uploading the sensor data to an edge computing unit by deploying a sensor; wavelet threshold denoising and electromagnetic interference compensation are adopted; the method comprises the following steps: constructing a coupling model containing arc plasma dynamic resistance, optimizing VMD parameters through PSO, extracting a joint feature vector, filling an arc and harmonic dynamic coupling analysis gap, calculating a total harmonic distortion rate and arc extinction time in combination with a power grid damping ratio, solving an optimal SVG trigger angle, and solving the problem of lack of power grid stability evaluation; correcting the opening time of the circuit breaker, calculating the error of the total harmonic distortion rate and the error of the arc extinction time, and adjusting the SVG trigger angle; calculating the precision of the evaluation model, calculating the full life cycle through the aging coefficient, analyzing and judging whether an early warning signal is generated or not, and triggering equipment replacement early warning based on the generated early warning signal.

The utility model discloses an electronic protection device and a power utilization device, and belongs to the field of fuses. The electronic protection device comprises a conductive element used for being connected to a circuit to be tested; the first excitation fuse and the second excitation fuse are connected in series on the conductive element; the arc extinguishing fuse is connected with the second excitation fuse in parallel; and the controller is used for detecting the value of a current flowing through the conductive element of a circuit to be detected, and is in communication connection with the first excitation fuse and the second excitation fuse. The first excitation fuse and the second excitation fuse are connected in series, the arc extinguishing fuse and the second excitation fuse are connected in parallel, and the controller outputs a trigger signal according to the detected current, so that the electronic protection device switches the first working mode or the second working mode, and the circuit can be protected when the circuit is overloaded or short-circuited.

An on-load tap-changer includes: a tap-changer body and a driving mechanism fixed on the tap-changer body. The tap-changer body includes a housing, multiple insulation fixing plates, multiple turntables, each of which includes a sheave and a cam plate, the cam plate of which is rotatably connected to the insulation fixing plate, and the sheave of which is connected to the driving mechanism, multiple vacuum tubes fixed on the multiple insulation fixing plates, and multiple transmission mechanisms, each of which includes a lifting lever and a reverse spring. When the driving mechanism drives the sheave to regulate voltage, the cam plate is synchronously driven to rotate, and then the vacuum tube is driven by the lifting lever and the reverse spring to achieve on / off arc extinction, thereby achieving on-load voltage regulation.

The invention discloses a multi-branch hydro-generator stator grounding fault active arc extinction method, which comprises the following steps: S1, constructing an analytic function of a double-frequency fault potential by using a neutral point and a generator end voltage after a generator fault and combining a winding connection sequence; s2, deriving a linear constraint relation between a third harmonic fault potential real part and an imaginary part; s3, according to the linear constraint relation, in combination with the potential expression of each branch winding of the third harmonic, constructing a target function for fault solution, and solving a solution set based on the third harmonic characteristic quantity; s4, according to the fundamental wave fault characteristic equation, constructing a fundamental wave difference coefficient multi-solution screening criterion, and obtaining a unique solution of the double-frequency fault potential; s5, aiming at the multi-branch hydro-generator, constructing a neutral point dual-frequency power supply injection amount calculation formula; and correctly adjusting the injection amount of the neutral point double-frequency controllable power supply by using the screened double-frequency fault potential unique solution, and suppressing the voltage of the fault point to be 0 to realize arc extinction. According to the invention, reliable arc extinction of the multi-branch hydraulic generator can be realized.

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 relates to a physical field coupling simulation analysis method and device of a circuit breaker, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring distributed conductivity in an arc extinguish chamber of the circuit breaker; according to the distributed conductivity and an electric field finite element equation, an electric field distribution value in the circuit breaker arc extinguish chamber is obtained through calculation; calculating a current density distribution value in the arc extinguish chamber of the circuit breaker based on the electric field distribution value; substituting the current density distribution value into an axisymmetric magnetic field equation, and performing electric field and magnetic field coupling; substituting the port boundary voltage and the port current of the arcing area of the circuit breaker into the circuit matrix equation, and carrying out electric field and circuit bidirectional coupling; the electric field finite element equation, the axial symmetry magnetic field equation and the circuit matrix equation are combined, and the potential distribution value and the magnetic field distribution value of the arcing area of the circuit breaker and the port boundary voltage and the port current of the equivalent resistor are obtained through solving. By adopting the method, the simulation analysis efficiency and precision of the circuit breaker arc extinguish chamber can be improved.

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 application discloses a kind of on-off mechanism for processing phase-to-phase fault, including two single-pole double-throw switches and a third switch, single-pole double-throw switch includes first arc chamber and second arc chamber, first fixed contact is provided in first arc chamber, second fixed contact is provided in second arc chamber, first composite movable contact is provided between first arc chamber and second arc chamber, first composite movable contact one end is located in first arc chamber, first composite movable contact other end is located in second arc chamber, first composite movable contact is connected with first fixed contact when then is disconnected with second fixed contact, first composite movable contact is connected with second fixed contact when then is disconnected with first fixed contact;Third switch includes third arc chamber, third fixed contact and third movable contact are provided in third arc chamber.The on-off mechanism structure is simple, can realize one fault phase conduction and make another fault phase connect ground or public wire, and it is convenient to be used with existing screen cabinet, with important practical value.

The utility model discloses a fuse link, a fuse and an electric device, and belongs to the field of fuses. The fuse link is provided with a fusing part, a first end used for being connected with a negative electrode and a second end used for being connected with a positive electrode, the fuse link is provided with a first narrow-diameter part between the fusing part and the first end, and the fuse link is provided with a second narrow-diameter part between the fusing part and the second end; the distance between the fusing part and the adjacent first narrow part is smaller than the distance between the fusing part and the adjacent second narrow part. The fusing part is arranged at the first narrow-diameter part on the side, closer to the negative electrode, of the fusing body, when current is overloaded, the fusing part is fused, arcing occurs at the fusing part, an electric arc ignites the first narrow-diameter part and the second narrow-diameter part which are located on the two sides of the fusing part, the fusing part is closer to the negative electrode, the distance of firing towards the positive electrode is reduced, the electric arc is made to be away from a high-temperature area, and the service life of the fuse body is prolonged. The influence of temperature on arc burning is reduced, and rapid arc extinguishing can be realized.

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 photovoltaic power grid fault transient control method, device and equipment, and relates to the technical field of photovoltaic auxiliary equipment, and the method comprises the following steps: obtaining the operation data of a photovoltaic grid-connected point, constructing a three-phase coupling characteristic matrix, and generating a disturbance discrimination result according to the dynamic evolution of the three-phase coupling characteristic matrix; based on a disturbance judgment result, collecting three-phase output current of the photovoltaic inverter, calculating disturbance increment of each phase of current, extracting a stable current component during a fault period based on low-voltage ride-through control logic, and calculating equivalent support power of the stable current component at a fault point; the equivalent support power is compared with a preset arc extinguishing threshold value, and the dissociation condition of the fault point is dynamically evaluated; when the fault point is not free, the photovoltaic inverter is controlled to perform state conversion, so that the equivalent support power is lower than an arc extinguishing threshold value; and after detecting that the voltage of the fault point is recovered and the arc light is extinguished, dynamically adjusting the reclosing time sequence based on the voltage recovery rate. The problems that arc light is difficult to extinguish and the reclosing failure rate is high are solved.

The invention discloses a vacuum arc extinguish chamber structure with large rated current and strong breaking capacity, which comprises a structure body, and is characterized in that the structure body comprises a static contact assembly, the static contact assembly comprises a static end arc contact and a static end main contact, and the static end arc contact is arranged in front of the static end main contact and protrudes for a preset distance d along the on-off direction; and the moving contact assembly comprises a moving end main contact and a moving end arc contact, and the moving end main contact and the moving end arc contact are located on the same plane. According to the invention, the effect that the main contact does not burn arc during breaking is realized, the contact surface of the main contact is protected from being ablated by the arc, and a physical foundation is laid for the high capacity of the vacuum arc-extinguishing chamber. The moving end arc contact is provided with a coil structure so as to generate a transverse magnetic field or a longitudinal magnetic field, and the magnetic lines of force between the static end arc contact and the moving end arc contact have the combined action of the longitudinal magnetic field and the transverse magnetic field, so that the breaking capacity is high.

The invention relates to the technical field of electric power, in particular to a vacuum circuit breaker and a phase selection closing control method, and the vacuum circuit breaker comprises a hybrid electromagnetic mechanism and a vacuum arc-extinguishing chamber; the hybrid electromagnetic mechanism comprises a permanent magnet closing assembly and an electromagnetic repulsion opening assembly, the permanent magnet closing assembly comprises double coils and a T-shaped movable iron core which are arranged in parallel, and a discharge loop is formed to drive a movable contact of the vacuum arc-extinguishing chamber to complete a closing action and maintain a closing state; the electromagnetic repulsion opening assembly comprises a static coil panel and a moving coil panel which are coaxially and oppositely arranged to form a reverse current repulsion loop so as to drive a moving contact of the vacuum arc-extinguishing chamber to complete an opening action and maintain an opening state, and the moving coil panel is connected with a T-shaped moving iron core of the permanent magnet closing assembly through an insulating guide rod; the vacuum arc-extinguishing chamber comprises a driving connecting rod, a moving contact and a static contact, one end of the driving connecting rod is connected with the moving contact, and the other end of the driving connecting rod is connected with the insulating guide rod. Therefore, the opening and closing speed of the vacuum circuit breaker is improved.

The utility model relates to a circuit breaker, which comprises a shell, an operating mechanism, a moving contact, a static contact and an arc extinguishing mechanism, the operating mechanism, the moving contact, the static contact and the arc extinguishing mechanism are arranged in the shell, the arc extinguishing mechanism comprises an arc extinguishing chamber, the arc extinguishing chamber comprises a first arc extinguishing grid plate group, and the first arc extinguishing grid plate group is composed of a plurality of first arc extinguishing grid plates. The first arc extinguishing grid sheets are arranged along the horizontal direction or are arranged at an included angle of-alpha-alpha relative to the horizontal direction; the arc extinguish chamber comprises a second arc extinguish grid sheet group which is composed of a plurality of second arc extinguish grid sheets and is arranged below the first arc extinguish grid sheet group, and the inlet end of the second arc extinguish grid sheet group is close to the moving track of the moving contact. The second arc-extinguishing grid sheets are obliquely arranged at an angle beta relative to the horizontal direction, and the outlet ends of the second arc-extinguishing grid sheets incline towards the outlet end direction of the first arc-extinguishing grid sheet group; alpha is smaller than 20 degrees, and beta is larger than 45 degrees and smaller than 90 degrees. And by optimizing the layout of the arc extinguishing grid sheets, a more effective arc extinguishing effect is realized.

The invention discloses a circuit breaker switch and intelligent detection system with real-time detection, which comprises a circuit breaker body, a contact system, an arc extinguishing system and an operating mechanism are arranged in the circuit breaker body, the contact system comprises a moving contact and a static contact, the bottom of the moving contact is fixedly connected with a bimetallic strip through a soft connecting line, and the bimetallic strip is fixedly connected with the arc extinguishing system through the soft connecting line. The invention relates to the technical field of circuit breakers. According to the circuit breaker switch with the real-time detection function and the intelligent detection system, a bimetallic strip is connected to the bottom of a moving contact, one end of the bimetallic strip is connected with a connecting piece made of a copper-molybdenum composite material, a box body made of red copper is installed at the bottom of the connecting piece, tin-bismuth alloy is injected into the box body, a heat pipe is attached to the bottom of the box body, and heat dissipation fins are installed at one end of the heat pipe. And the copper-molybdenum composite material connecting sheet has extremely low thermal expansion and high thermal conductivity, so that the efficient transfer of heat can be ensured, and the influence of thermal expansion on the structural stability can be reduced.

The invention relates to the technical field of switch cabinets, in particular to a power distribution intelligent alternating-current high-voltage switch cabinet capable of preventing electric arc overflow, which comprises a cabinet body, and a bracket and a fixed plate which are fixed in the cabinet body, and is characterized in that an electric control structure is arranged on the bracket; the pump air cylinder is fixed on the fixing plate, and an air storage tank is fixed on the pump air cylinder; the first piston disc is connected into the pump air cylinder in a sliding and sealing mode, the first piston disc is connected with a second piston disc in a sliding and sealing mode, the second piston disc is connected with the inner wall of the pump air cylinder in a sliding and sealing mode, a high-pressure cavity is formed between the first piston disc and the pump air cylinder and between the second piston disc and the pump air cylinder, and a conduction switching mechanism is arranged on the pump air cylinder; according to the invention, when the current fluctuates, the position of the first piston disc can be constrained, when the current exceeds a set value, the constraint on the first piston disc is relieved, and meanwhile, under the action of the energy storage triggering mechanism, high-voltage arc extinguishing gas is quickly sprayed to an arc area so as to execute efficient arc extinguishing action.

Disclosed in the present invention are a data-driven multi-objective optimization method for an environment-friendly gas arc-extinguishing system, and a related device. The method comprises: firstly, inputting collected key design variables of an environment-friendly gas arc-extinguishing system into a parametric circuit breaker cold-state simulation model for simulation, so as to output objective function values; using the key design variables and the corresponding objective function values to construct and train a data-driven model, so as to predict and evaluate a design space; and finally, combining the data-driven model with an optimization objective function for representing the breaking capability of a circuit breaker, and using a multi-objective genetic algorithm to output optimal design variables, so as to realize the optimization of the environment-friendly gas arc-extinguishing system. The method solves the problems of reliability and efficiency in traditional designs on the basis of multi-objective collaborative optimization and a data-driven model, and makes minor modifications to the structure of a circuit breaker to significantly improve the breaking performance of the circuit breaker, thereby improving the reliability and efficiency of circuit breaker design processes.

The utility model discloses a relay which comprises a shell, a contact assembly, a fixing piece and an armature assembly. The contact assembly is arranged in the shell and comprises two contact parts, one contact part is provided with a first static contact, and the other contact part is provided with a first movable contact. The fixing piece is fixedly arranged in the shell, and the fixing piece and the shell are of a split structure. The fixed part is provided with a first arc extinguishing part, and the first arc extinguishing part is located around the first static contact and the first movable contact and used for extinguishing electric arcs generated between the first movable contact and the first static contact. And the armature assembly is arranged in the shell, is connected to the fixing piece in a swinging manner, and is used for driving the contact part provided with the first movable contact to move, so that the first movable contact is in contact with or separated from the first static contact.

The invention discloses a circuit breaker with external vacuum arc extinguish chambers, and belongs to the technical field of circuit breakers, the circuit breaker with the external vacuum arc extinguish chambers comprises a circuit breaker body, the circuit breaker body is provided with a plurality of external arc extinguish chambers, the top of each external arc extinguish chamber is fixedly provided with a terminal, the side wall of each terminal is fixedly provided with a cushion block, and the cushion blocks are fixedly connected with the external arc extinguish chambers. A fixed clamping jaw is movably arranged outside the cushion block, the other ends of the multiple arc-shaped rods are jointly and fixedly provided with a top grading ring, two connecting rods are fixedly arranged at the bottom of the top grading ring, and a bottom grading ring is fixedly arranged at the bottoms of the two connecting rods. According to the invention, the top grading ring and the bottom grading ring are arranged outside the external arc extinguish chamber, the electric field of the external arc extinguish chamber can be homogenized, and the top grading ring and the bottom grading ring can be fixed on the side wall of the external arc extinguish chamber due to the existence of the fixed clamping jaw and the fixing mechanism. Therefore, the vibration influence during the switching-on and switching-off operation of the circuit breaker is avoided.

This application relates to the field of circuit breakers, specifically disclosing a high breaking capacity measuring switch, which includes a housing, a moving contact rotatably disposed within the housing, and a stationary contact disposed within the housing. It also includes an arc-extinguishing chamber and an arc-pulling assembly disposed on the arc-extinguishing chamber. The arc-pulling assembly is located on the side of the moving contact away from the stationary contact. The arc-pulling assembly includes a first permanent magnet and a second permanent magnet symmetrically arranged, with an arc-pulling channel formed between the first and second permanent magnets. The arc-pulling channel is located on the moving path of the moving contact. This application improves the arc-extinguishing performance of the measuring switch.

The invention discloses a generator stator grounding fault active arc extinction method based on double-loop quasi-PR control, and the method comprises the following steps: S1, monitoring the fundamental wave zero-sequence voltage and third harmonic voltage of a neutral point and a generator end of a generator, and carrying out the fault phase selection and positioning when a single-phase stator grounding fault occurs; s2, according to a fault positioning result, calculating a fault winding potential Ef, and setting a negative value-Ef of the fault winding potential Ef as a neutral point target compensation voltage; s3, a cascaded H-bridge converter is adopted as a topological structure of the active regulation and control device, and a double-closed-loop control framework composed of a voltage outer loop and a current inner loop is established; s4, setting quasi-PR control units for the fundamental wave component and the third harmonic component in the voltage outer ring and the current inner ring respectively; and S5, controlling the cascaded H-bridge converter to output a compensation voltage consistent with the target compensation voltage-Ef, and injecting the compensation voltage into the neutral point of the generator. The voltage regulation and control precision and the arc suppression speed in the active arc suppression process of the generator can be improved, and the operation safety and reliability of the generator are improved.

The utility model belongs to the technical field of vacuum circuit breakers, and relates to an integrated indoor high-voltage vacuum circuit breaker, which comprises a metal underframe, an isolating switch, a grounding switch, a through-wall type solid-sealed polar pole, a vacuum arc-extinguishing chamber and an operating mechanism, and is characterized in that the isolating switch, the grounding switch, the through-wall type solid-sealed polar pole and the vacuum arc-extinguishing chamber are all mounted on the metal underframe; the isolating switch and the vacuum arc-extinguishing chamber are respectively arranged on two sides of the metal underframe and are electrically connected through a through-wall solid-sealed polar pole 11; and the operating mechanism is integrated with a five-prevention interlocking mechanism and is integrally arranged in the metal chassis, and corresponding linkage shafts in the operating mechanism are used for respectively controlling the opening and closing of the vacuum arc-extinguishing chamber, the isolating switch and the grounding switch in a transmission manner. The integrated structure is provided with the isolation station, the circuit breaker station and the grounding switch station, the operation is simple and convenient, the operation is safe and reliable, the whole body is more integrated, complete-set, miniaturized and safe, and the installation is simple, rapid and convenient.

The utility model relates to the technical field of vacuum circuit breakers, and discloses an outdoor pole-mounted solid-sealed primary and secondary fusion permanent magnet vacuum circuit breaker, which comprises a base, a protective shell is arranged on the base, and the protective shell is fixedly connected with the base; the circuit breaker assembly is arranged in the base and the protective shell, the circuit breaker assembly is used for protecting a circuit, the circuit breaker assembly internally comprises an installation frame, a first arc extinguish chamber and a second arc extinguish chamber, the installation frame is arranged on the base and fixedly connected with the base, and the second arc extinguish chamber is elastically connected with the installation frame. The first arc extinguish chamber is fixedly connected with the second arc extinguish chamber, the first arc extinguish chamber is fixedly connected with the mounting rack, the first arc extinguish chamber and the second arc extinguish chamber are respectively arranged, the first arc extinguish chamber and the second arc extinguish chamber are connected in series, and after the first arc extinguish chamber is damaged, the second arc extinguish chamber can be used for transient supporting operation; the vacuum circuit breaker assembly is prevented from being thoroughly paralyzed after being damaged, and damage to the whole circuit is reduced.

The invention discloses a transfer branch structure for vacuum parallel connection and disconnection, a load switch and a ring main unit, and relates to the technical field of ring main unit power distribution switches, and the transfer branch structure comprises a parallel connection and disconnection arc extinguish chamber, a moving end pull rod, a transfer conductor, a solid sealing insulation shielding body, a guide limiting mechanism and an opening maintaining and closing auxiliary mechanism. The guide limiting mechanism is connected with the moving end pull rod and the insulating rotating plate so as to convert the rotating motion of the insulating rotating plate into the linear motion of the moving end pull rod, and when the insulating rotating plate rotates to the position where the transfer branch structure is in the opening state, the opening maintaining and closing auxiliary mechanism compresses stored energy so that the transfer branch structure can be kept in the opening state; and energy can be released in the process that the insulating rotating plate rotates towards the closing position to assist closing, so that the action stability and reliability of the transfer branch structure are greatly improved, the equipment fault risk is reduced, and the service life of the equipment is prolonged.

The excitation fuse comprises a shell provided with a cavity, a conducting bar is arranged in the shell in a penetrating mode in a sealed mode, a piston and an ignition device are arranged in the cavity of the shell on one side of the conducting bar, and a displacement channel for the impact end of the piston to penetrate through is arranged at the position, needing to be disconnected, of the conducting bar. A sealing plate is arranged at the end, facing the piston, of the displacement channel and makes close contact with the shell on the periphery of the displacement channel, and a sealing structure is arranged between the sealing plate and the shell on the periphery of the displacement channel. The sealing plate is provided with a profiling through hole corresponding to the displacement channel, the profiling through hole allows the impact end of the piston to penetrate through and imitates the peripheral size and shape of the impact end of the piston, arc extinguishing chambers are arranged on the shell on the other side, away from the piston, of the conducting bar, and when the number of the arc extinguishing chambers is multiple, the arc extinguishing chambers are independently arranged. According to the invention, by arranging the sealing plate with the profiling through hole and the sealing structure, the sealing performance and the breaking reliability of the product are improved.

The utility model relates to the technical field of load switches, and provides a load switch, which comprises a switch bracket, a plurality of inner brackets are arranged in the switch bracket, a movable knife rest is arranged in each inner bracket, and a gas driving and injection system consisting of a piston, a connecting rod, a gas cylinder and an injection head is introduced. The movable knife rest rotates to be connected with a connecting rod of the piston, the piston is driven to move up and down when the movable knife rest is switched at different positions, then gas in the gas cylinder is extruded out, and the gas is accurately injected to the tip of the arc striking strip protruding from the injection head to the static blade. On one hand, the design that the end part of the arc striking strip protrudes out of the static blade efficiently gathers the opening arc to the tip according to the electric field principle, thereby laying a foundation for subsequent accurate arc extinguishing; and on the other hand, the gas ejected by the injection head directly strikes the tip of the arc striking strip, so that ions and heat generated by point discharge can be blown away, a stable arc extinguishing environment is created, re-aggregation of the arc can be inhibited, and generation of the arc and electromagnetic interference are effectively prevented.

The invention discloses a magnetic rotation arc extinguishing circuit breaker contact structure, and belongs to the technical field of high-voltage electric connectors. Comprising an arc extinguishing device, a connecting device and a circuit breaker contact, the arc extinguishing device can be connected with the circuit breaker contact through the connecting device, the arc extinguishing device is integrally of a cylindrical structure, a longitudinal magnetic field is generated when current flows through the arc extinguishing device, and when an arc passes through the middle area of the arc extinguishing device, the arc is effectively stretched and rapidly extinguished under the action of the magnetic field. The connecting device comprises a centering piece and a fixing assembly, the centering piece can fix the arc extinguishing device on the axis of the centering piece, and the fixing assembly can fix the arc extinguishing device. Through the arc extinguishing assembly, a longitudinal magnetic field is formed when current passes through the arc extinguishing assembly, and the arc rotates and stretches along a spiral path under the action of magnetic field force, so that the arc extinguishing efficiency of the circuit breaker is remarkably improved, and the problem that the magnetic field direction is inconsistent with the arc flowing direction in the prior art is solved.