2732 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 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 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 invention discloses an alternating-current and direct-current fault protection method of a hybrid commutation converter valve and related equipment thereof, and relates to the technical field of high-voltage direct-current power transmission. The method comprises the steps of obtaining an AC voltage of an AC side, a target trigger angle of a hybrid commutation converter valve and a DC current of a DC side, and determining an extinction angle margin risk factor and a volt-second area margin risk factor according to at least one of the above, the extinction angle margin risk factor being used for representing a commutation success margin, and the volt-second area margin risk factor being used for representing a target trigger angle of the hybrid commutation converter valve; the volt-second area margin risk factor is used for representing the commutation driving capability; determining a commutation failure risk index based on the extinction angle margin risk factor, the volt-second area margin risk factor and the prediction confidence factor; and when the commutation failure risk index is abnormal, controlling and triggering the hybrid commutation converter valve to enter a corresponding commutation enhancement mode or an active turn-off mode based on the commutation failure risk index. According to the embodiment of the invention, active intervention can be carried out before the commutation failure is caused by the AC / DC fault, so that the commutation failure can be fully resisted.

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.

The utility model relates to a speed-adjustable vacuum circuit breaker, which comprises a controller, a driving mechanism, a current sensor, a supporting insulator, an insulating pull rod, a moving end conductor, a vacuum arc-extinguishing chamber, a static end conductor and a main cable, and is characterized in that when the current of a main loop of the circuit breaker flows through the main cable, the current sensor transmits the detected current value of the main loop to the controller; the controller analyzes and judges the input main loop current value, when the main loop current value is smaller than a set value, the controller inputs a small-value opening control current to a driving mechanism of the circuit breaker, and at the moment, the driving mechanism drives the circuit breaker to do slow opening motion, so that mechanical shock is reduced; and when the current value of the main loop is greater than or equal to the set value N, the controller inputs a large-value opening control current to the driving mechanism of the circuit breaker, and the driving mechanism drives the circuit breaker to perform rapid opening motion at the moment. According to the utility model, the problems of short service life and high failure rate of the traditional circuit breaker are solved, the operation power consumption of the circuit breaker is reduced, and the purpose of energy conservation is realized.

The invention relates to the technical field of power control, in particular to a direct-current load dynamic control method and system based on active arc extinguishing, and the method comprises the steps: collecting the electrical parameters and non-electrical parameters of a direct-current electric appliance in real time; performing arc energy calculation on the electrical parameters and the non-electrical parameters to obtain an arc energy characterization index; acquiring response demand characteristics of the low-voltage power distribution system to the direct-current electric appliance and application environment characteristics of the direct-current electric appliance in real time; performing arc risk assessment on the response demand characteristics, and determining a first arc risk threshold value of the DC electric appliance at the moment; correcting the first arc risk threshold value in real time by considering the influence generated by the characteristic arc of the application environment to obtain a second arc risk threshold value; and determining a load control strategy of the direct-current electric appliance according to the difference amplitude between the electric arc energy characterization index and the second electric arc risk threshold value in response to the electric arc energy characterization index exceeding the second electric arc risk threshold value.

The invention provides an intelligent phase control vacuum circuit breaker health degree assessment method and device and a circuit breaker, and relates to the technical field of circuit breaker health assessment, and the method comprises the steps: carrying out the vacuum degree detection of an arc extinguish chamber in an intelligent phase control vacuum circuit breaker, and obtaining the vacuum degree; performing heating analysis on the vacuum circuit breaker according to the vacuum degree to obtain a heating parameter, and performing zero crossing point monitoring error analysis to obtain a zero crossing point error coefficient; according to the operation time parameter of the vacuum circuit breaker, mapping to obtain a mapping zero-crossing point error coefficient, calculating to obtain a zero-crossing deviation coefficient, and according to the zero-crossing deviation coefficient and an analysis deviation coefficient of heating analysis and zero-crossing point monitoring error analysis, carrying out confidence degree processing to obtain a zero-crossing confidence degree; and distributing a weight according to the zero-crossing confidence coefficient, and performing health degree calculation based on the vacuum degree and the zero-crossing point error coefficient to obtain the health degree of the vacuum circuit breaker. The technical problem of inaccurate health degree evaluation of the intelligent phase-controlled vacuum circuit breaker in the prior art is solved.

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 discloses an integrated sealed primary and secondary fusion pole-mounted circuit breaker in the technical field of circuit breakers, and the integrated sealed primary and secondary fusion pole-mounted circuit breaker comprises a case, a push-pull mechanism, a first elastic mechanism and a second elastic mechanism. A plurality of sets of insulating pull rods extending into the circuit breaker body are installed in the case in an up-down sliding mode, the push-pull mechanisms are fixedly installed in a plurality of sets of supports in the case in a rotating mode, and the top ends of the push-pull mechanisms are fixedly connected with the bottom ends of the insulating pull rods. The two sides of the support are symmetrically provided with two groups of first elastic mechanisms connected with the push-pull mechanism, and the problems that the speed of a movable contact block in an existing circuit breaker cannot be effectively buffered when the movable contact block rapidly gets close to or gets away from a static contact block, and the elastic mechanisms in the circuit breaker are inconvenient to efficiently synchronize energy storage and pressure release of a closing spring and an opening spring; and the operation efficiency, the reliability, the synchronism, the arc extinguishing performance and the like of the circuit breaker are not improved.

An excitation fuse with a melt structure comprises a shell, an excitation source, at least one conducting bar and the melt structure. A first cavity and a second cavity filled with an arc extinguishing medium are arranged in the shell; the cavity where the driving force releasing end of the excitation source is located is communicated with the first cavity, and the conducting bar penetrates through the shell and the first cavity; the melt structure is arranged at least partially in the arc extinguishing medium in the second cavity or penetrates through the arc extinguishing medium in the second cavity; the fuse body structure comprises a fuse body connected with the conducting bar in parallel and insulation isolation pieces, at least one insulation isolation piece is arranged on the fuse body in the current direction, the fuse body penetrates through the insulation isolation pieces, and the insulation isolation pieces are used for partially or completely isolating electric arcs at fractures of the fuse body and releasing gas and cooling the electric arcs at the high temperature of the electric arcs. The excitation fuse uses a melt structure, so that the breaking performance of the fuse and the insulating performance and the voltage resistance after breaking can be improved.

The invention relates to the technical field of switch technology, in particular to a residual current action photovoltaic protection switch, which comprises a shell, a fixed contact system, an operating mechanism I, an operating mechanism II, an arc extinguishing system and an electronic monitoring unit, and is characterized in that the fixed contact system, the operating mechanism I, the operating mechanism II, the arc extinguishing system and the electronic monitoring unit are arranged in the shell; a permanent magnet is arranged in the side wall of an arc extinguish chamber of the arc extinguish system, a second electromagnetic coil is arranged on the bottom wall of the arc extinguish chamber of the arc extinguish system, and a magnetic field generated by the permanent magnet is perpendicular to a magnetic field generated by the second electromagnetic coil. A magnetic field generated by the permanent magnet and a magnetic field generated by the second electromagnetic coil are overlapped, so that the arc is lengthened under the acting force of the magnetic field, an arc channel is arranged on the arc chute in a matched mode, a spiral groove is formed in the arc channel, the arc moves along the spiral groove, and the motion path of the arc is lengthened until the arc disappears.

The invention provides a single-step prediction active arc extinction control method and device for high-proportion photovoltaic access, and relates to the technical field of power electronic technology control application. The method comprises the following steps: acquiring a reference compensation current when a single-phase grounding short circuit fault occurs; obtaining all switching states of the three-level cascaded H-bridge converter, wherein each switching state corresponds to the conduction condition of one group of H-bridge units; a Riemann-Liouville non-integer order derivative is utilized to establish a non-integer order inductance model, and the non-integer order inductance model is utilized to update the three-level H-bridge converter; predicting a current output value of the three-stage cascaded H-bridge converter in each switching state at the next moment based on the updated three-stage cascaded H-bridge converter, and taking each current output value as a predicted compensation current; and determining a target switching state based on the predicted compensation current and the reference compensation current of each switching state so as to control the conduction of the three-stage H-bridge converter. The method can effectively extinguish the arc, and improves the safety and reliability of the power system.

The invention discloses a high-voltage vacuum circuit breaker contact motion detection method and system based on an inversion model, and the method comprises the steps: firstly designing a dual-position speed sensor collection unit for collecting speed signals of different positions and different characteristics, and achieving the mutual triggering; based on an inversion model, a programmable logic component and a CPU are adopted for result operation and logic inversion and correction, a rotation angular velocity curve is obtained, and the accurate motion state is obtained through comparison; according to the method, the stroke characteristic curve in the arc extinguish chamber of the high-voltage vacuum circuit breaker can be accurately reflected, mutual conversion of angular velocity and linear velocity at different positions can be realized based on the thought of an inversion model, and finally effective data which can be analyzed and judged can be output for system application.

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 the field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to a circuit breaker. An existing circuit breaker is improved, a brand-new solid-sealed polar pole is adopted, and high-pressure gas is compressed and generated in the opening and closing process of the solid-sealed polar pole by means of linear motion of a transmission rod in the opening and closing process of the solid-sealed polar pole and an air cylinder in transmission connection with the transmission rod; high-pressure gas is subjected to heat dissipation through the heat dissipation pipe section of the slow-release exhaust pipeline, and then low-temperature high-pressure gas is continuously blown into the heat dissipation gas cavity through the slow-release exhaust pipeline, so that heat exchange is carried out in the arc extinguish chamber in the heat dissipation gas cavity, high temperature generated in the opening and closing process of the arc extinguish chamber is taken away, and heat dissipation and cooling of the arc extinguish chamber are achieved. According to the novel solid-sealed polar pole, heat dissipation and cooling of the arc extinguish chamber are achieved by means of power provided by an operating mechanism in the opening and closing process, other cooling equipment does not need to be configured, the system structure is simplified, and energy consumption is reduced.

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 discloses a rapid fusing device for adaptive overload protection, and belongs to the technical field of overload protection. Comprising a multi-dimensional monitoring module used for collecting circuit current, environment temperature and humidity and equipment operation parameters in real time; the intelligent processing module is internally provided with a self-adaptive algorithm unit, and dynamically calculates and adjusts a multi-stage fusing threshold value based on real-time acquired data; the rapid execution module comprises a composite fusing structure and an arc extinguishing unit, and the composite fusing structure executes overload early warning, graded fusing or complete cutting action according to the multi-stage fusing threshold value; and the communication interaction module is used for realizing device state remote monitoring, threshold parameter remote configuration and fault information uploading. Parameters such as current, temperature and humidity are collected in real time through the multi-dimensional monitoring module, a multi-stage fusing threshold value is dynamically adjusted in combination with a self-adaptive algorithm of the intelligent processing module, the limitation that the threshold value of a traditional fuse is fixed is broken through, load fluctuation and environment change can be accurately adapted, and mistaken fusing or protection lag is avoided.

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 utility model discloses a miniature circuit breaker, which comprises a shell provided with an arc extinguish chamber. The arc extinguish chamber is connected with an upper arc striking sheet; the upper arc striking sheet comprises an upper arc striking sheet conductive section and an upper arc striking sheet arc striking section; the conductive section of the upper arc striking sheet is made of copper, and the arc striking section of the upper arc striking sheet is made of iron; the upper arc striking sheet conductive section and the upper arc striking sheet arc striking section are connected through a solder layer; a moving contact plate used for being matched with the upper arc striking sheet is arranged in front of the upper arc striking sheet, and an electric shock part used for being in contact with the upper arc striking sheet is arranged on the moving contact plate. The moving contact plate is made of copper-iron-phosphorus alloy.

The present application relates to a high-breaking-power fuse, comprising a protective tube; a contact blade, which is sealed and arranged on both ends of the protective tube, and is used to form an arc-extinguishing cavity on the inner side of the protective tube; a fuse, which is arranged in the arc-extinguishing cavity; a conductive connecting piece, which is arranged at the disconnection point between the fuse and the circuit where the contact blade is located; an overload installation box, which is arranged in the arc-extinguishing cavity, and the overload installation box is provided with a mounting cavity and a connecting hole; a connecting rod, one end of which is arranged in the mounting cavity, and the other end slides in and out of the connecting hole, and an arc-extinguishing filling area connected to the connecting hole is formed between the mounting cavity and the connecting rod; a connecting solder, which is arranged between the fuse and the end of the connecting rod outside the mounting cavity, and is used to conduct the disconnection point between the fuse and the circuit where the contact blade is located; a breaking spring, which is connected to the connecting rod and is used to retract the connecting rod into the mounting cavity; and an arc-extinguishing medium, which is filled with overpressure and arranged in the arc-extinguishing cavity. The present application has the effect of improving the arc-extinguishing performance of the fuse.

The invention relates to a fuse and electric equipment. The fuse comprises a shell, an electric connection unit, an action unit and an excitation unit. The shell is provided with a first cavity and a second cavity, and a communicating hole is formed in the cavity wall of the first cavity so that the first cavity can communicate with the second cavity. The electric connection unit is mounted on the shell and comprises a connection bar and a melt which are connected in parallel; the action unit comprises a first breaker movably installed in the first chamber and a second breaker movably installed in the second chamber. The excitation unit is mounted on the shell; wherein the excitation unit is used for driving the first disjunction device to disconnect the connecting bar, and is also used for driving the second disjunction device to disconnect the melt after the first disjunction device disconnects the connecting bar; and when the first breaking device does not cut off the connecting row, the first breaking device blocks the communicating hole. The invention aims to provide the fuse with the arc extinguishing capability and the breaking capability.

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 invention relates to a characteristic interval fitting and modeling method for breakdown voltage between GIS (Gas Insulated Switchgear) disconnecting switches, which is characterized in that on the basis of an actually measured scatter diagram of breakdown voltage, optimal distribution fitting is carried out on the scatter diagram, the distribution interval is predicted, and upper and lower boundary curves are calculated, so that subsequent modeling is facilitated. On the basis of an original simulation model, randomness of breakdown voltage is introduced to be combined with a reignition arc module to form a new model, and the new model is combined with an arc quenching module, a switch control module and an arc resistance module to form a new GIS disconnecting switch dynamic reignition arc simulation model. According to the invention, simulation of switch gap arc reignition randomness and extinguishing phenomenon is realized, and then the peak value distribution condition and the maximum peak value of the VFTO are analyzed. According to the method, the simulation precision is improved, the influence of the switching operation on the VFTO can be evaluated more accurately, and the reliability analysis of an electrical system is enhanced.

A contact system of an isolating switch and the isolating switch, the isolating switch comprises an operating mechanism and at least one contact system, the operating mechanism and the contact system are stacked, and the operating mechanism is connected with a rotating part of the contact system; the contact system comprises a shell, a moving contact assembly, a static contact and an arc extinguish chamber, the moving contact assembly, the static contact and the arc extinguish chamber are arranged in the shell, the moving contact assembly comprises a rotating part and a moving contact, the arc extinguish chamber comprises an arc extinguish cover, a plurality of arc extinguish grid pieces and a permanent magnet, and the permanent magnet is arranged on the arc extinguish cover and located between the arc extinguish grid pieces and the rotating part. The arc-extinguishing grid sheets are provided with gaps facing the permanent magnet, the gaps of the plurality of arc-extinguishing grid sheets form an arc channel, during opening action, an arc passes through the arc channel along with the moving contact, at the moment, the arc is located in the arc channel formed by the arc-extinguishing grid sheets and is concentrated on one side of the permanent magnet, and under the action of Lorentz force generated by the permanent magnet, the permanent magnet is separated from the moving contact. The arc can be quickly led to the arc extinguishing grid sheets, the arcing time is shortened, and the breaking reliability of the switching device is improved.

The invention discloses an alternating-current high-voltage rotational symmetric busbar frame circuit breaker, and relates to the technical field of electrical equipment, the alternating-current high-voltage rotational symmetric busbar frame circuit breaker comprises a circuit breaker main body of a rectangular frame structure, and the outer wall of one side of the circuit breaker main body is provided with a deflector rod used for efficiently guiding contacts of the circuit breaker main body to be separated. The deflector rod is made of high-strength alloy steel, one end of the deflector rod is in a bent angle shape, the end, close to the circuit breaker body, of the deflector rod is electrically connected with an internal contact of the circuit breaker body, one end of the high-voltage arc-extinguishing chamber is matched with the internal contact of the circuit breaker body in an inserted mode, and the high-voltage arc-extinguishing chamber is in a cube shape. A gas production increasing unit is arranged outside one side of each arc extinguishing grid piece, a back anti-breakdown unit is arranged inside one side of the base, a discontinuous deionization unit is arranged on one side, close to the base, of each arc extinguishing grid piece, and the gas flow rate and the gas volume are increased through the gas production piece, so that gas flow in the high-voltage arc extinguishing chamber is promoted.