3563 results about "Arc extinction" patented technology

A DC relay for anti-short circuit current and arc extinction includes two static contact leading-out ends, a movable contact piece in a straight sheet type, a pushing rod assembly, a fixed upper yoke, a follow-up yoke and a lower armature. The fixed upper yoke is fixed above the movable contact piece, corresponding to a position between the two movable contacts. The follow-up upper yoke is fixed on the pushing rod assembly, above the movable contact piece, corresponding to a position between the two movable contacts. The lower armature is fixed on a bottom end face of the movable contact piece. The fixed upper yoke, the follow-up upper yoke and the lower armature are respectively arranged in a width direction of the movable contact piece, and two magnetic conductive loops are formed in the width direction of the movable contact piece.

The invention relates to the technical field of electrical performance testing, and particularly discloses a method and system for evaluating the electric shock life of an arc extinguish chamber of a low-voltage circuit breaker, and the method comprises the steps: S1, collecting real-time arc extinguish performance index parameters in the arc extinguish chamber of different low-voltage strength grades in a preset time period and the cumulative number of closing operations of the circuit breaker of different low-voltage strength grades; s2, simulating an arcing process change image of each closing operation of the circuit breaker based on real-time arc extinguishing performance index parameters in the arc extinguishing chamber with different low-voltage strength grades, establishing an arc extinguishing three-dimensional model, and performing feature extraction analysis on the arcing process change image to obtain a standard arc state coefficient; s3, inputting the real-time arc extinguishing performance index parameter and the standard arc state coefficient into a preset analysis model for prediction analysis, and obtaining an arc extinguishing prediction value; and S4, inputting the predicted arc extinguishing value, the cumulative number of closing operations and a historical evaluation factor into the predicted analysis model for training to construct an arc extinguish chamber electric shock life evaluation model.

The present application provides a method for preparing a vertical fuse and an electronic device, comprising: obtaining a parameter table of a vertical fuse, wherein the parameter table includes a preparation sequence of the vertical fuse, and a physical parameter set and a matching relationship parameter set of multiple structures in the vertical fuse, wherein the multiple structures include a first tube body, a second tube body, a target melt, and an arc extinguishing layer; and preparing multiple structures of the vertical fuse according to the preparation sequence and the physical parameters. In this way, the preparation sequence and structural parameters of the vertical fuse are configured through the parameter table, so that the preparation device of the vertical fuse can automatically perform corresponding preparation operations according to the preparation sequence, thereby improving the automation degree and preparation efficiency of the vertical fuse preparation device.

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 circuit breakers, and discloses a magnetic control type pole-mounted circuit breaker, which comprises an arc extinguish chamber, a mechanism box, a current transformer and an isolating switch, and is characterized in that the arc extinguish chamber comprises a ceramic airtight shell fixedly mounted on the upper side of the mechanism box, and a fixed contact is fixedly mounted in the ceramic airtight shell; a moving contact is slidably installed in the ceramic airtight shell, a corrugated pipe is fixedly installed in the ceramic airtight shell, the moving contact is fixedly connected with the corrugated pipe, and a sliding rod is slidably installed in the mechanism box. The magnetic control driving mechanism is arranged in the mechanism box to drive the sliding rod to horizontally move left and right, the moving contact is driven to move up and down through the transmission effect of the transmission plate, the moving contact and the fixed contact are kept in a contact or separation state, opening and closing actions of the arc extinguish chamber are achieved, the design structure is simple, a buckle structure for restraining the position of the moving contact is simplified, and the working efficiency is improved. The device has the advantages of low failure rate and sensitive opening and closing actions.

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 utility model discloses a primary and secondary fusion complete column-mounted circuit breaker, and belongs to the field of circuit breakers, and the primary and secondary fusion complete column-mounted circuit breaker comprises an equipment box, the top of the equipment box is provided with a jack, an insertion rod is inserted into the inner wall of the jack, the top of the insertion rod is fixedly provided with an arc extinguish chamber, the inner cavity of the equipment box is provided with a placement groove, and the outer side of the equipment box is provided with a through groove. A first wafer is arranged on the inner wall of the containing groove, one end of a spring is fixedly connected to the outer side of the first wafer, a second wafer is fixedly connected to the other end of the spring, a connecting rod is slidably connected to the inner wall of the through groove, two sliding blocks are symmetrically and fixedly assembled on the outer edge of the connecting rod, and two sliding grooves are symmetrically formed in the inner wall of the through groove. According to the invention, the problems that one of the arc extinguish chambers is damaged due to the fact that the structure of an existing device is too fixed, and the other two arc extinguish chambers are inconvenient to disassemble and can only be scrapped together are solved, so that the convenience of the installation and disassembly of the arc extinguish chambers is improved.

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 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 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 invention discloses an insulating main contact contact structure and a contactor, the insulating main contact contact structure comprises a base part, an insulating shaft sleeve, a transmission rod, an arc extinguishing grid sheet, a screw A, a movable contact and a fixing assembly, the insulating shaft sleeve is arranged in the base part, the transmission rod penetrates through the insulating shaft sleeve, the transmission rod penetrates through the base part through the insulating shaft sleeve, and the arc extinguishing grid sheet is arranged on the base part. The arc extinguishing grid sheet is connected and fastened with the base part through a screw A. The movable contact is arranged on the insulating shaft sleeve. In the using process of the prepared contactor, due to the fact that the arc extinguishing grid pieces are designed between the contacts, the arc burning time of the contacts of the contactor in the on-off process is shortened, and ablation splashes of the contacts are reduced; and meanwhile, the insulated gate sheet with the inverted E-shaped cross section is designed and assembled on the base, so that the insulating property between the static contacts is improved, the insulating property between the main contacts of the contactor is improved, and the service life of the contactor is prolonged.

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 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 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 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 high-voltage switch circuit breaker vacuum bubble arc extinguish chamber vacuum degree on-line monitoring method and device. The method comprises the steps of measuring a main loop current value of a high-voltage switch circuit breaker at the moment of opening and closing through a current transformer; performing spectrum analysis on the main loop current at the moment of opening and closing through fast Fourier transform to obtain an opening and closing arc spectrum value; according to the current on-off current value, calculating the residual electrical life of the contact; and calculating the vacuum degree of the arc extinguish chamber of the vacuum bubble of the high-voltage switch circuit breaker according to the current value of the main loop at the moment of opening and closing, the frequency spectrum value of the opening and closing arc at the moment of opening and closing and the current service life of the contact. And the vacuum degree condition of the high-voltage switch circuit breaker is comprehensively judged by combining the measured current value of the loop when the high-voltage switch circuit breaker is switched on and switched off, the residual electric life of the contact and the arc-extinguishing discharge frequency spectrum at the switching-on and switching-off moment, so that the problem that misjudgment exists when the vacuum degree is judged only by depending on the arc-extinguishing discharge frequency spectrum is solved, and the practical value is higher.

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 17.5 kV ring main unit. The 17.5 kV ring main unit comprises an outdoor box shell and a ring main unit shell which are integrally designed. The upper end of the box body is hinged with an upper door plate, the middle part is provided with a gas box, the lower end is provided with a cable chamber and a cable withstand voltage test chamber, and the top is an instrument chamber. Load switches are arranged on the two sides of the gas tank symmetrically, and a circuit breaker switch is embedded in the middle of the gas tank and connected through a CV busbar. The load switch is provided with an arc extinguishing grid sheet, an insulating umbrella skirt and a specially-designed grounding contact, so that arc extinguishing can be effectively realized, the insulating performance is improved, and the grounding effect is optimized. The design of the transmission assembly accurately controls the motion of the moving contact. The circuit breaker switch comprises a vacuum bubble and other components, and can efficiently extinguish arc. In addition, the lower end of the load switch is provided with test and incoming and outgoing line terminals, the driving unit is provided with a program lock, and the instrument chamber is provided with a power supply and a voltage transformer. The ring main unit optimizes space utilization through integrated design, has remarkable advantages in the aspects of electrical performance, operation convenience and maintenance, is suitable for various electric power scenes, and powerfully ensures stable operation of an electric power system.

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.

The invention relates to a method for intelligently judging the type of a single-phase earth fault in a power supply and distribution system, which is suitable for connecting arc extinguishing equipment to a system bus and is parallel to each feeder line connected to the system bus. Wherein the working stage of the arc extinguishing equipment is divided into an arc extinguishing equipment awakening stage, a fault phase selection arc extinguishing stage and a fault type line selection stage. When a single-phase earth fault occurs in the range of a system line where the arc extinction equipment is located, the arc extinction equipment is quickly awakened and enters a fault phase selection arc extinction stage, and the single-phase earth fault occurring in the system line can be quickly processed through three links of phase selection, verification and arc extinction. And the method has the capabilities of fault tolerance, error correction and severe transient process suppression in the processing process. A three-phase split-phase switch driven by eddy current is selected as a phase selection switch in the arc extinction equipment, and the two-phase switch cannot be switched on or switched off at the same time due to disorder switching-on and switching-off programs when the arc extinction equipment performs phase selection action due to the wiring mode of each phase switch coil panel in the three-phase split-phase switch.

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 provides an environment-friendly load switch arc extinguishing structure, and relates to the technical field of arc extinguishing structures, the environment-friendly load switch arc extinguishing structure comprises a frame structure and an arc extinguishing structure, the environment-friendly load switch arc extinguishing structure is also provided with a dynamic sealing assembly, impurities such as metal steam generated in the arc extinguishing process can be effectively removed by adding filtering after air blowing, and in the process, the sealing effect is good. The arc extinguishing structure plays a key role, an arc extinguishing chamber in the arc extinguishing structure is a main area for generating metal steam, so that the insulating part is always kept good insulating performance, and a safe electrical environment is constructed by insulating components such as the insulating shell, the silicon rubber reinforced insulation and the insulating support and a filtering measure. And the safety of operators is protected, and safe and reliable operation of equipment under normal working voltage is ensured, so that a stable electrical environment in the environment-friendly gas cabinet is favorably maintained, electrical accidents such as flashover and breakdown caused by reduction of insulating property are avoided, and the stability of a whole power system is ensured.

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.