2236 results about "Arc extinction" patented technology

The invention discloses a distribution network ground fault arc extinction and protection method, which comprises the following steps of: measuring a three-phase voltage and a zero sequence voltage of a distribution network, and detecting a ground fault and a fault phase; when the ground fault happens, injecting a current into the distribution network and forcibly zeroing the voltage of the faultphase and the current of the ground fault; delaying a period of time and reducing the injected current; if the zero sequence voltage is reduced proportionally, indicating that the fault point is subjected to arc extinction, determining that the fault is an instant fault, reducing the injected current to zero and recovering the normal running of the distribution network; otherwise, determining that the fault is a permanent fault, changing the injected current, detecting and isolating a fault feed line according to the variation of a zero sequence current, and recovering the normal running of the distribution network. By the method, the voltage of the fault phase is used as a control target, so total arc extinction of the instant fault and quick isolation of the permanent fault can be realized by injecting the current and forcibly zeroing the voltage of the fault phase; and the technical difficulties in poor arc extinction effect of the current arc extinction method and low reliability of the conventional protection method are overcome.

There is provided by this invention a novel apparatus and method of operating a dc plasma process that diverts the power supply current from the plasma at the initiation of an arc, thereby inhibiting energy from flowing from the power supply to the plasma, and then to allow energy to flow again when the power supply re-enables energy flow to the plasma. The diverting means is connected to the output of the power supply to divert current away from the plasma at the initiation of an arc wherein the diverting means is actuated when the arc is detected on the output and diverts the current for a first pre-determined time. The diverting means is released at the end of the first pre-determined time before the current reaches zero wherein current is redirected to the plasma and the diverting means is reactivated at the end of a second pre-determined time in the event the arc is not extinguished.

The invention relates to a power distribution network fault arc extinction method by connecting a neutral point to the ground through multi-level converter. The power distribution network fault arc extinction method is characterized in that the cascade H-bridge multi-level converter is adopted and directly connected at the position of the neutral point of a power distribution network through a reactor; at the initial moment when the power distribution network has a single-phase earth fault, synthetic operation is conducted to generate offset currents needed to be injected (img file='69356dest_path_image001. TIF'wi'19' he'=25' / ), then the offset currents are quickly put into the multi-level converter, the multi-level converter is controlled by aid of the current tracking control algorithm and the PWM (Pulse-Width Modulation) modulation strategy to generate offset currents (img file='652784dest_path_image001. TIF'wi'19' he'=25' / ), and the offset currents are put into the neutral point of the power distribution network so as to compensate grounding total currents of the fault point. In addition, the fault phase voltage is forced to be 0 constantly so the instantaneous grounding fault can be cleared automatically, and further the technical problem of the existing fault arc extinction technology of poor arc extinction effect can be solved.

A single-pole relay switch capable of effective arc extinction irrespective of the current flowing directions in which the device is connected in a circuit. The switch has a housing and two sets of contacts located in the housing, each set being composed of a fixed contact and a movable contact. A contact carrier is provided to have first and second movable arms which extend commonly from a bridge and are provided respectively with the two movable contacts. An actuator applies a driving force to move the contact carrier between an ON-position of holding the movable contacts simultaneously in contact respectively with the fixed contacts, and an OFF-position of keeping the movable contacts at respective opening gaps from the fixed contacts. The housing includes a casing which is divided into first and second chambers respectively for receiving the contact sets, each of the first and second chambers being surrounded by a dielectric wall. Permanent magnet are disposed around the casing to stretch the individual arcs in opposing directions to each other and towards the dielectric walls of the first and second chambers, respectively. Thus, the individual arcs can be stretched individually within the separate chambers, i.e., in an isolated condition. Therefore, the individual arcs can be free from merging even when the current flows in such a direction as to drive the arcs in the approaching direction.

A conduction breaking device includes a conductive body arranged between a pair of devices in an electric circuit, a gas generator, which is arranged away from the conductive body and generates gas, and a cutting member, which is arranged between the conductive body and the gas generator. The cutting member is moved due to gas from the gas generator to cut the conductive body, divides the conductive body into a first cut piece and a second cut piece, which have cut ends separated from each other, and breaks the conduction between the devices. The conduction breaking device includes an arc-extinguishing chamber. In the arc-extinguishing chamber, the conductive body is cut by the cutting member and an arc occurring between the cut end of the first cut piece and the cut end of the second cut piece is extinguished.

The invention discloses a dual-closed-loop control-based active voltage arc extinction method and apparatus for a power distribution network in fault. The arc extinction method comprises the following steps of collecting a three-phase voltage and a neutral point voltage of the power distribution network, and judging whether the power distribution network suffers from a single phase grounding fault or not; if the power distribution network suffers from the single phase grounding fault, determining a fault phase according to the value of the three-phase voltage; injecting an initial current to the power distribution network to obtain a phase voltage and a neutral point voltage of the fault phase, and determining an optimal injection current through a dual-closed-loop control method; and injecting the optimal injection current to the power distribution network to realize arc extinction on an instantaneous single phase grounding fault. According to the method and the apparatus disclosed by the embodiments, based on the dual-closed-loop control method, a current is injected to the neutral point of the active arc extinction apparatus when the power distribution network suffers from the single phase grounding fault; and the fault phase voltage is controlled to be zero, and the reactive current component, the active current component and the harmonic component of the fault phase are compensated, so as to realize rapid and high-precision complete arc extinction on the instantaneous single phase grounding fault.

The invention discloses an SF6 decomposition gas infrared spectrum multi-component detection method and a device. According to the method, a chopped wave modulation wheel and a spectroscopical filtration wheel in a traditional non-dispersion infrared spectrum technology are combined into a whole, a modulation filtration wheel is utilized to realize simultaneous measurement of multi-component gas,and a long path multiple reflection absorption technology is combined simultaneously to increase detection sensitivity. The device comprises an optics unit, a gas circuit unit and an electronics unitarranged in a main machine box. The SF6 decomposition gas infrared spectrum multi-component detection method and the device are suitable for electrical equipment fault monitoring and diagnosing in anelectrical system with SF6 gas being an insulation and arc extinction medium. On-line gas concentration measurement with high speed, high sensitivity and non-interference is realized.

The invention relates to an arc-control device applied in a photovoltaic combiner box. The arc-control device particularly comprises a confluence branch which is formed by electrically connecting a photovoltaic negative electrode busbar, a special photovoltaic fuse, a special photovoltaic diode and a photovoltaic positive electrode busbar in sequence, and a detection and control circuit which is formed by a resistor divider module, a voltage comparison module, a timer module, a signal processing module, an RS 485 communication module, a two-input OR gate, a driving circuit module and an IGBT (Insulated Gate Bipolar Transistor) module; and the invention also relates to a combiner box arc-control method applying the arc-control device.

The invention relates to a method for protecting a direct current line transient short-circuit fault of a modular multiple-level converter, belonging to the technical field of direct current transmission. A group of two-way thyristor switch is connected on alternating current ports of each power unit of the modular multiple-level converter in parallel, when a direct current line has a transient short-circuit fault, control pulses of all of the power units are closed, and all of the two-way thyristor switches are triggered to be switched on at the same time, so that the short-circuit point of the direct current line is in natural arc extinction and disappears. When short-circuit current of the direct current line is detected to be zero, all of the two-way thyristor switches are controlled to be switched off, and the control pulses of all of the power units are opened, so that the converter runs again. With the adoption of the method, a switch device of the converter can be quickly protected from damage during a failure, and the direct current short-circuit point is in the natural arc extinction after failure, therefore, the device can automatically run again, thereby avoiding the complete off-stream of the device and greatly improving the reliability and the availability factor of the device.

The invention discloses an energy-feeding flexible grounding device for a power distribution network, a fault arc extinction method and a direct-current-side-voltage control method and system of the energy-feeding flexible grounding device. The fault arc extinction method includes the steps that when a single-phase grounding fault is generated, a neutral point of the power distribution network is grounded through a flexible grounding device, the flexible grounding device is controlled to inject a resistive current and a reactive current into the neutral point in sequence, a fault feeder line is judged, and arc extinction of a fault point is promoted. The direct-current-side-voltage control method includes the step that energy exchanging between the flexible grounding device and the power distribution network is achieved through a direct-current-side capacitor voltage outer loop and a three-phase input current inner loop, and therefore it is guaranteed that the direct-current-side voltage is constant. By means of the direct-current-side-voltage control method, the problems that the direct-current-side voltage of a traditional flexible grounding device is difficult to stabilize, the harmonic content of an injected current is high, and system stability is poor can be solved; by switching control modes, the fault feeder line can be accurately identified, an instant grounding fault electric arc can be eliminated, and the power supply reliability of the power distribution network can be improved.

The invention relates to an on-line monitoring and controlling method for single-phase ground compensation state in an arc suppression coil system, which can effectively estimate compensation state of the system according to relative phase relation between negative sequence component I2 of failure current of a failure line and inductance current IL of an arc suppression coil, and can correctly regulate the arc suppression coil, in order to lead the system into a resonance state; through comparing I2 with a threshold value, the resonance state can be effectively estimated and ensure that the electric arc is reliably extinguished. After the system in the resonance, the change of the run mode can be effectively estimated according to the change of zero sequence current IN0 of the failure line under the standard voltage, when IN0 is changed, the run mode is changed, the compensation state can be effectively estimated after the run mode is changed according to the IN0 before changed and the IN0 after changed, and the arc suppression coil can be correctly regulated again to lead the system into a new resonance state. The on-line monitoring and controlling method dose not need to on-line measure earth capacitance of a distribution system, which reduces the regulation of the arc suppression coil during normal operation and contributes to safe operation of the system, and the load symmetry can not affect the effectiveness of the method at the same time.

The invention provides a current full compensation method and a system based on single-phase earth fault. When zero sequence voltage is not in a preset voltage value range, namely, the happened single-phase earth fault is instant ground connection, an arc extinction coil device with high flexibility in high-resistance ground connection can compensate ground connection capacitive current. When thezero sequence voltage is in the preset voltage value range, namely, the happened single-phase earth fault is not instant ground connection, a breaker in a fault phase transfer ground connection deviceconnected with a fault phase is turned off, fault current is converted into earth current, and a compensable compensation device is further utilized to output full compensation fault residual current. The fault current is converted into the earth current, the earth current can serve as tracking compensation signals of the compensable compensation device, and judgment reference is provided for a compensation effect of the compensable compensation device. In addition, the earth current can be determined by measurement; furthermore, measurement is convenient, and complex calculation is avoided;thus, compensation quickness and accuracy are ensured, compensation precision is improved, and fault points are shielded.

The invention aims to provide a disjunction electric arc testing method for a switching electric appliance contact for providing effective guarantee for electric arc theoretical studies with even performance figures, high testing efficiency and reliable testing result, and a device thereof. The device consists of a mechanical system and a circuit system, which are connected. The disjunction electric arc testing method for the switching electric appliance contact and the device thereof comprise relay electric arc testing and simulated electric arc testing. The method and the device solve the problem that theoretical analysis or computed result is difficult to verify during the electric arc theoretical studies. The invention provides a relay electric arc testing method and a simulated relay electric arc testing method. The method and the device meet requirement for various testing conditions during electric arc testing, and solve the problems of low testing efficiency and poor confidence level of the testing result. For deep comprehending the arcing mechanism and analyzing the property of the electric arc, the invention further provide a method for quickly extinguishing arc to provide effective support for improving the performance and the reliability of a relay.

The invention relates to arc extinction slurry for a fuse protector. The arc extinction slurry comprises, by weight, 5-40 parts of gas production materials, 0-10 parts of phenol formaldehyde resin, 20-60 parts of quartz sand, 0.6-10 parts of organic solvents and15-30 parts of deionized water. The gas production materials are mainly urea-formaldehyde resin and other powder materials; the phenol formaldehyde resin can be boron-modified phenol formaldehyde resin and other high-temperature-resistant resin which is soluble in organic solvents, and the main effect of the phenol formaldehyde resin is to improve the heat-resistant performance of urea-formaldehyde resin; the periphery of a melt is covered with the arc extinction slurry in a filling mode or a thick film printing mode or the like, and gas will be produced under the action of an electric arc so as to extinguish the electric arc; fast cooling of the metallic melt is guaranteed by adding the quartz sand, and therefore the arc extinction slurry can be used on the breaking occasion of high voltage and great current of more than 250VAC / 100A. The arc extinction slurry has the predominant advantages of being low in production cost, easy to operate, free of halogen, friendly to environment, high in arc extinction ability and the like, thereby being suitable for being used in a current common tube shell type or thick film printing type surface-mounted miniature fuse protector.

A thermally protected surge suppression device comprises a housing and a base seat with a mounting plate. The base seat is provided with a surge suppression component and a thermal protection device, and the thermal protection device further comprises a metal bulge electrically connecting to the electrode B of the surge suppression component, a compression spring, a slider provided with an arc extinguishing component movable on the guide-track groove. In normal working condition, the conductive metal member electrically connects to the metal bulge via a low temperature solder. When the surge suppression component fails, the low temperature solder is melt owing to being passed through the power frequency fault current, the conductive metal member is disconnected from the metal bulge, the compression spring pushes the arc extinguishing component to move to obstruct the disconnected gap, and form an airflow to extinguish the electric arc between the conductive metal member and the metal bulge. The present invention provides a safer, more timely and reliable circuit protection.

The invention discloses an on-load capacity-regulating switch for a transformer. The on-load capacity-regulating switch comprises a high-voltage coil switching system, a low-voltage coil switching system, at least one permanent magnet mechanism and a transmission mechanism matched with the permanent magnet mechanism; the high-voltage coil switching system comprises at least three vacuum arc extinguish chambers; the low-voltage coil switching system comprises at least four vacuum arc extinguish chambers; the permanent magnet mechanism reciprocally drives each vacuum arc extinguish chamber to perform switch-off and switch-on actions through the transmission mechanism to further switch the coils of the transformer to realize the purpose of regulating the capacity of the transformer. Through the structural scheme that the high-voltage coil switching system and low-voltage coil switching system formed by the vacuum arc extinguish chambers are driven by the permanent magnet mechanism, the problem in arc extinguish in the high voltage side and the lower voltage side is solved; and the on-load capacity-regulating switch is simple in structure, high in reliability, short in action completion time, long in service life and maintenance-free in lifelong time.

The invention relates to a high-speed opening operation mechanism of a middle-and-low-voltage direct-current circuit breaker, which is particularly suitable to be applied to high-speed direct-current circuit breakers with high requirements on short-circuit breaking capacity. The operation mechanism comprises a moving contact, a fixed contact, a closing retaining device and an electromagnetic repulsion mechanism, wherein the closing retaining device comprises a closing retaining spring, a horizontal limit sleeve and a closing retaining top-block; and the electromagnetic repulsion mechanism comprises an opening push-rod, a reset spring, a repulsion disc, a coil, a charge and discharge circuit and a controller. The invention provides a high-speed opening operation mechanism of a middle-and-low-voltage direct-current circuit breaker, which is simple in structure, easy to operate, and quick in opening speed; and by using the operation mechanism, the on-off speed of the direct-current circuit breaker can be improved, the dead time of an electric arc can be shortened, the ablation of the contacts is reduced, and a situation that the electric arc enters into an arc extinguish chamber as soon as possible and then is extinguished quickly is facilitated, thereby improving the on-off performance of the direct-current circuit breaker.

The invention provides a dynamic voltage sharing device of a multi-break vacuum circuit breaker and a parameter selection method for the dynamic voltage sharing device. A voltage sharing capacitor, a current limiting resistor and a zinc oxide arrester are used as a dynamic voltage sharing component of a multi-break serial vacuum circuit breaker; and the voltage sharing capacitor is connected in series with the current limiting resistor and then is connected in parallel with the zinc oxide arrester. The optimal value of relative parameters is selected in combination with vacuum arc model-based electromagnetic transient simulation according to a synthesis test. According to the technical scheme, reliable switch-off of a plurality of vacuum arc extinguish chambers during serial operation can be ensured, and the vacuum circuit breaker can be applied in the voltage range of 110kV and more than 110kV.

The invention discloses an active voltage arc-extinction method applicable to a single-phase earth fault of a medium voltage distribution network, and relates to the technical field of fault self-recovery of a medium voltage distribution network. The active voltage arc-extinction includes the following steps: a. continuously measuring bus three-phase voltage, zero sequence voltage and each outlet three-phase current, and when a single-phase earth fault is detected, conducting fault phase selection; b. designating a threshold Ires.g of a fault phase current magnitude and a threshold Ures.g of a fault phase voltage magnitude of a fault feeder; c. measuring the voltage and current of the fault phase, comparing the fault phase current magnitude of the fault feeder with Ires.g. According to the invention, the method can effectively increase the arc extinction of a low-resistance earth fault, and compensate current at a fault point as much as possible while excess voltage is effectively controlled, and ensures that arc at the fault point can be reliably extinct. According to the invention, for non-linear resistance earth, the method is also effective simply by changing program codes in current active compensating apparatuses, and has higher values when applied to engineering.

The invention provides a high power mixed direct current contactor and a method thereof, the invention is composed of a direct current contactor main body and an arc extinguishing system. The direct current contactor comprises a movement contact, a main body bracket, an electromagnetic coil and other parts, completing switching effect. The arc extinguishing system comprises a contactor closed electric arc eliminating part and a contactor disconnection arc extinguishing part. The closed electric arc part of the mixed direct current contactor is composed of a electric source switching circuit, a signal separating and collecting circuit, a control circuit and a MOSFET drive circuit; electric power electric switch is switched on and the jumping electric arc is removed by detecting the contact closed signal; the disconnection process contact electric arc eliminating part is composed of a maintaining circuit, a judging circuit, a control switch circuit and an energy absorbing circuit, utilizing the absorption property of the electric power capacitance energy to eliminate the electric arc generated when the contactor contact breaks the high power load; design of a PCB plate distribution is optimized to reduce the influence of parasitical parameters to a maximum extent, enabling the high power mixed direct current contactor to completely eliminate the influence of the electric arc in the process of breaking operation.

The invention relates to an insulating enclosed type pagoda-shaped fuse (1), which comprises upper and lower lead-out wires (6 and 7), upper and lower chambers (8 and 9) in the fuse, upper and lower fixed contacts (11 and 22), an arc extinction cylinder (15) and a fuse carrier (28) inserted into the arc extinction cylinder; the opening position at the lower end of an insulator body is fixed with a lower cover (24); the lower cover (24) is detachably provided with a cover body (26) of a penetrating pressure releasing hole (25); and the surface leakage distance of the fuse is more than 350mm. The insulating enclosed type pagoda-shaped fuse can instantly discharge high-pressure gas instantly generated through the pressure releasing hole to relieve the damage to components in the fuse; and in addition, the power frequency withstand voltage of the fuse is higher (dry flashover is between 42 and 48kV, and wet flashover is 30kV), the breaking performance of 12kV reaches Sym. 8kA, and the safety performance of the hot-line work is improved.

On the basis of an original system, a bus PT, a self-adaptive control parallel loop, a self-adaptive control module and the like are added for a power distribution network grounding self-adaptive control system. Optimization and adjustment on switching and a resistance value of a switch are achieved under the system support by adopting a self-adaptive control method and through the self-adaptive control module. The method further provides a self-adaptive control optimization strategy for adjustment of an arc extinction coil and a variable-resistance gear. The power distribution network grounding self-adaptive control system improves the accuracy of fault line tripping, effectively reduces control and adjustment errors during a next fault, effectively prevents grounding fault signals from being mistakenly send and remarkably improves the line selection accuracy in a single-phase grounding mode.

The present invention relates to an arc extinction brush, comprising a solid mixture brush body, wherein, the solid mixture brush body consists of a solid lubricant, wax, and a fast film formation substance; the solid lubricant is any of tin, lead, indium, cadmium, silver and oxides thereof; the fast film formation substance is any of molybdenum disulfide, tungsten disulfide, silver iodide, lithium carbonate, barium carbonate or sodium silicate. The present invention also comprises a method of using the arc extinction brush to eliminate electric arc of brushes for generators. The arc extinction brush is used to replace a brush to participate in motor operation and is matched with the operation of eliminating a bad oxide film, and after the arc extinction brush is repeatedly put into operation, the arc extinction brush can help form a good oxide film, so as to eliminate electric arc of brushes for generators and to reduce the sliding friction and self-vibration of brushes.

The invention discloses an arc-welding material additive manufacturing method for a stainless steel part. The arc-welding material additive manufacturing method for stainless steel part includes the steps that a three-dimension part model is built according to the structure of the stainless steel part, layering treatment is carried out on the three-dimension part with parting software, scanning path planning is carried out on each layer, and information of the layers of the part is obtained; forming technological parameters are determined, specifically, arc welding current is 90-120 A, arc welding voltage is 13-18 V, the wire feeding speed is 4-8 m / min, the flow of protective gas is 15-25 L / min, and the scanning speed is 0.3-0.7 m / min; and the information is input into an arc-welding material additive manufacturing device, and formation of the stainless steel layer is completed step by step and layer by layer according to the sequence from arcing to forming and arc extinction. The stainless steel part prepared through the method meets the requirement, a metallographic structure is free of pores and cracks and tends to a martensitic structure, the texture is fine, and the layers are in metallurgical bonding.

This invention tracking arc-extinction compensation and select-switching device comprises: Z type grounding transformer connected to bus-bar, which neutral point being connected to one end of arc-extinction coil L1 by a single phase isolation switch, other end of L1 is grounding, said neutral point being connected to lightning protector and a single phase voltage inductance, the secondary wniding, by two ends, being paralleling respectively (1). compensated reactor branching which being composed of a compensated reactor and a silicon cotnrol series connected; (2). buffer resistance branching which being composed of series connected a buffer resistance and a silicon control, zero sequence current mutual inductor CT1-CT48 feedthrough connected to various out line of the sstem. The sampling signals and control signals is connected to controlling device. Advantages are: reliability, no need of filter.

The invention discloses a multifunctional power distribution net flexible grounding device and a control method. The device is arranged on the side of an electricity generator and a power distributionnetwork transformer secondary side or a power distribution network busbar side; the device comprises a three-phase converter and a controllable switch, and the neutral point of the three-phase converter can be grounded through the controllable switch; the device works in the reactive compensation mode under the normal condition, when a single-phase grounding fault of the power distribution net happens, the controllable switch is closed, the device injects zero-frequency / common mode current or zero frequency / common mode voltage into a power distribution network three-phase circuit so as to achieve the purposes of single-phase grounding fault arc extinction and fault positioning, and the reactive compensation, single-phase grounding fault arc extinction and fault positioning functions can be enabled at the same time. The reactive compensation, circuit grounding parameter measurement, arc extinction, fault line selection, positioning and other functions can be integrated into the same device, the reactive compensation function can be normally enabled while the single-phase grounding arc extinction, single-phase grounding line selection, positioning and other functions are achieved, and multiple purposes of the device are truly achieved.

This invention relates to converter device and to high pressure knob breaker, which comprises comprise three phase or single phase knob, knob lever and structure case, wherein, the knob adopts high voltage SF6 gas as arc extinction and insulator medium; each knob column knob down end is located with heating device; the heater device comprises temperature controller, heater, contact and heater breaker; the above elements form heater circuit.

The invention relates to a high-pressure gas breaker breaking performance assessment method and system. The method comprises the following steps of: carrying out magnet dynamic simulation on an arcing process of a high-pressure gas breaker to obtain total arc voltage and arc current before the arc current crosses zero; extracting model parameters of a preset zero area arc model; taking the total arc voltage and the arc current as initial conditions to solve past-arc current under the action of transient recovery voltage on the basis of the zero area arc model; judging whether the high-pressure gas breaker causes thermal breakdown or not in the breaking process according to change trend of the past-arc current; obtaining pressure intensity distribution and temperature distribution in an arc extinction chamber under the action of the past-arc current through magnet dynamic simulation, comparing field intensity, caused by the action of the transient recovery voltage, at each point of the arc extinction chamber, corresponding temperature and critical breakdown field intensity, and assessing the probability of electric breakdown in the arc extinction chamber. By adoption of the method and system provided by the invention, the comprehensive assessment for the past-arc thermal breakdown and electric breakdown characteristics of the high-pressure gas breaker is realized.

The invention discloses a circuit breaker which comprises a housing, a contact mechanism, an arc extinction system, an operation mechanism and a magnetic tripping mechanism, wherein the contact mechanism comprises a dynamic contact and a static contact; a dynamic contact point is arranged on the dynamic contact; a static contact point is arranged on the static contact; the arc extinction system comprises an arc extinction system chamber; the arc extinction chamber is provided with an arc extinction grid-plate, an arc isolation plate and an arc striking assembly; the arc striking assembly comprises an upper arc striking plate and a lower arc striking plate; the lower arc striking plate is connected with a bimetallic strip; the bimetallic strip is matched with the dynamic contact in a linkage manner; the operation mechanism comprises a handle, a main bracket, a linkage assembly and a lock catch assembly; the lock catch assembly comprises a lock catch and a jump catch; the magnetic tripping mechanism comprises an iron core, a coil and a magnetic yoke; the arc extinction chamber comprises an arc inlet end and an arc outlet end; the arc outlet end is provided with arc outlet shunting partition regions which are a first arc outlet region and a second arc outlet region respectively; and arc guide outlets communicated with the first arc outlet region and the second arc outlet region are formed in the housing. The circuit breaker has the advantages of good breaking capacity, excellent arc extinction effect, safety and reliability.