80results about How to "Fast arc extinguishing" patented technology

The invention provides an operating mechanism of a miniature circuit breaker, which comprises a housing, a handle and a static contact. The internal surface of the housing is provided with a handle shaft. The handle is sleeved on the handle shaft. The invention further comprises a transmission rod, a transmission component and an electromagnetic trip gear. The transmission rod is hinged with the handle and the transmission component. The transmission component comprises a lock latch shaft, a lock latch spring, a lock catch, a moving contact, a jumping latch and a jumping latch spring. The lock latch shaft is arranged on the internal surface and parallel with the handle shaft. The other parts is sleeved on the lock catch shaft in turn. The moving contact and the static contact are matched with each other. A triggering lug boss is arranged on the jumping latch, which is matched with a releasing rod pushed by a moving iron core in the solenoid of the electromagnetic trip gear. The invention can further comprises an adjustable reaction spring used for restricting the operation of the moving iron core, a bimetallic strip, an arc striking tab and an arc suppressing device. The invention has the advantages of less components, simple structure, good stability , low cost, convenient production and installation, safety and adjustable setting current.

The invention discloses a single-phase grounding-fault arc extinguishing system of a small-current grounding system. The single-phase grounding-fault arc extinguishing system comprises a grounding line selection device, a boosting transformer and a voltage source. Bus three-phase voltage, zero sequence voltage and branch zero sequence currents are input to the input end of the grounding line selection device, and the output end of the grounding line selection device sends out control signals; the voltage source receives the control signals to output specific voltage vectors, and the output endof the voltage source is connected to the low voltage side of the boosting transformer; one end of the high voltage side of the boosting transformer is connected with the neutral point of the small-current grounding system while the high voltage side of the same is grounded. The invention further discloses an arc extinguishing method of the system. fault phase voltage is consistent with the ground, grounding fault can be eliminated rapidly, the situations that grounded cables are burned by arc light and electric shock casualties are avoided, the system does not have to trip immediately and continuous to operate safety for a period of time after single-phase grounding fault, and reliability and security of the system are greatly improved.

A fixed contact (2) and conductive movable contact (3) includes contact regions (21,22,31,32). Contact regions of both contacts are electrically connected and separated in ON and OFF states of switch. The magnets (71,72) produces constant magnetic field (M) under contact regions and applies magnetic force (F) in range between contact regions to remove electric arcs (51,52) produced in OFF state along preset direction. Two bridge plates (81,82) remove electric arcs in different direction along movement axis (BA) of movable contact with respect to contact regions of fixed contact.

The embodiment of the disclosure discloses a power distribution network-based control method for a grounding failure suppression device. The method is used for acquiring an optimal injection current parameter and injecting corresponding injection current into a neutral point of a power distribution network to suppress single-phase grounding failure voltage and failure current. The method of the embodiment of the invention comprises the following steps: determining a phase reference value and an amplitude reference value of corresponding injection current when measured failure phase voltage is minimum, and then injecting the corresponding injection current according to the phase reference value and the amplitude reference value. According to the method, a control process is simplified, and complex detection of multiple parameters is eliminated; the reference values of the injection current are acquired, thereby controlling injection of the corresponding current to realize rapid arc extinction of a grounding failure of the power distribution network.

The invention belongs to the field of electronics, and particularly discloses a current monitoring type electronic arc-control device which is suitable for the arc-control purpose for a mechanical switch. The current monitoring type electronic arc-control device comprises a power semiconductor device connected with the mechanical switch. At least one current sensor is connected with the mechanical switch and used for detecting the switch-on and switch-off of the mechanical switch. The output end of the current sensor and the control end of the power semiconductor device are connected with a control circuit. The control circuit controls the power semiconductor device to be powered off when detecting the switch-off of the mechanical switch. The current monitoring type electronic arc-control device has the advantages that the switch-on time of a thyristor is short, and reliability is high.

The invention discloses a lightning arrester used for a power transmission line, and belongs to the power transmission line lightning protection technology field. The lightning arrester comprises a lightning leading electrode used for electrically connecting a power transmission line, a grounding electrode used for electrically connecting a grounding wire, a supporting insulator used for keepinga distance between the lightning leading electrode and the grounding electrode, and the lightning arrester arranged between the grounding electrode and the lightning leading electrode. The lightning arrester comprises a plurality of conductors which are arranged in an insulating support body at intervals, an arc extinguishing chamber with an arc blowing hole is arranged at a position, corresponding to a gap between the two adjacent conductors, of the insulating support body, and the arc blowing hole faces a back direction of the power transmission line and a line insulator is connected with the power transmission line. A voltage dividing capacitor and an arc extinguishing gate which are connected in series are formed through a pure air gap structure, repeated use can be achieved, rapid arcextinguishing can be realized, and a condition that high-temperature electric arcs blown from the arc blowing hole burn out the power transmission line can be avoided.

The invention discloses a fast arc extinguisher, a medium and low voltage metal switch cabinet and an application method of the fast arc extinguisher. A three-phase opening and closing operating mechanism with electromagnetic repulsion coils is arranged on a bracket of the fast arc extinguisher, and the electromagnetic repulsion coils of the three-phase opening and closing operating mechanism areconnected in series to form a three-phase integrated electromagnetic repulsion coil; the medium and low voltage metal switch cabinet comprises a medium and low voltage metal switch cabinet body and the above-mentioned fast arc extinguisher; and the application method includes the step of performing closing and grounding on three-phase lines of the medium and low voltage metal switch cabinet. According to the scheme of the invention, the three-phase simultaneous closing action can be completed within 5ms to perform fast arc extinguishing, so that the personal safety threats of arc faults to theequipment and the operation and maintenance personnel can be effectively reduced, and wide engineering application values can be achieved; and the scheme of the invention has a function of fast opening, can complete opening within 10ms, is favorable for restarting a power distribution system, can be repeatedly used, and can further reduce the maintenance cost of a novel fast arc light protectionsystem after operation.

The invention discloses a flexible grounding power distribution network fault composite arc extinguishing method. The method comprises the following steps: firstly, screening out working conditions, such as a grounding fault phase judgment dead zone caused by a high-resistance grounding fault of an asymmetric power distribution network, which are difficult to realize reliable arc extinguishing by a voltage arc extinguishing method;secondly, according to complex grounding fault working conditions, power distribution network parameter characteristics, defining the value range of each parameter in the fault power distribution network equivalent model, obtaining differential characteristic indexes of a voltage arc extinction method and a current arc extinction method in the aspects of starting conditions, voltage and current instruction detection and synthesis, arc extinction performance evaluation and the like are obtained through the output current when the flexible grounding device works in a voltage arc extinction mode, and obtaining voltage and current arc extinction mode constraint conditions are respectively; and finally, forming a flexible grounding system composite arc extinction strategy with a voltage arc extinction method as a main method and a current arc extinction method as an auxiliary method. Reliable arc extinction under the complex grounding fault working condition is achieved.

An arc extinguishing system of a DC contactor comprises two static contacts (1, 1'), a moving contact (2) and at least two permanent magnets; the two static contacts (1, 1') are connected to or disconnected from the two ends of the moving contact (1) to realize ON / OFF of the contactor; and the system is characterized in that the two permanent magnets are installed in a connecting line of the two static contacts (1, 1') and positioned between the two static contacts (1, 1'). The whole arc extinguishing system is small in size, high in disconnecting capability, simple in structure, convenient toassembly, and capable of non-polarity rapid arc extinguishing.

The invention provides a high-voltage vacuum extinction chamber, belonging to the technical field of high voltage electrical apparatus insulation, and aiming at realizing the purposes of increasing a transient turn-off current and extinguishing arc quickly. The high-voltage vacuum extinction chamber comprises a glass shade, and a static end cover board and a movable end cover board which are respectively fixed at two ends of the glass shade, wherein a static conducting rod fixed on the static end cover board and a movable conducting rod connected to the movable end cover board in a sliding manner are arranged in the glass shade; the inner end of the static conducting rod is provided with a static contact, the inner end of the movable conducting rod is provided with a movable contact as big as the static contact; a first static shade barrel covering the static contact and the static conducting rod inside, and a first movable shade barrel which is arranged by being symmetric to the first static shade barrel and covers the movable conducting rod inside, are arranged in the glass shade; the inner side faces of the opposite ends of the first static shade barrel and the first movable shade barrel are provided with spiral turned edges, and when the movable contact is disconnected with the static contact, the movable contact can move into the first movable shade barrel. The high-voltage vacuum extinction chamber can realize quick arc extinguishing and improve the instantaneous current interruption capability of the vacuum extinction chamber.

The invention discloses a contact mechanism in a four-breakpoint contactor. The contact mechanism comprises a moving contact structure, a static contact structure and an arc extinguishing structure; the moving contact structure comprises a first moving contact, a second moving contact, a moving contact support, two overtravel springs, three clamp springs, two guide rods and a connection rod, the moving contact support is arranged on the top of the connection rod in a sleeving mode through one of the clamp springs and provided with a first end and a second end, and the two guide rods are vertically arranged at the first end and the second end of the moving contact support respectively; the static contact structure comprises a first static contact, a second static contact, a third static contact, a fourth static contact, a conducting plate and a ceramic base, four hollow holes are formed in the ceramic base, the bottoms of the first static contact, the second static contact, the third static contact and the fourth static contact are each provided with a static contact point which is exposed out through one hollow hole, and the tops of the first static contact and the second static contact are connected through the conducting plate; and the arc extinguishing structure comprises four permanent magnets and two permanent magnet pressing plates which are each in the shape shown in thespecification and are arranged at the periphery of the ceramic base in an enclosing mode.

The invention discloses a quick arc extinguishing system and method for a single-phase ground fault of a low-current ground system. The quick arc extinguishing system comprises a ground line selection device, an inverse parallel thyristor group and a thyristor driving device. The ground line selection device adopts bus three-phase voltage and zero-sequence voltage, judges whether a ground fault exists according to the zero-sequence voltage and judges the ground phase according to the voltage drop phase in the three-phase voltage after single-phase grounding happens, and then the thyristor group driving device triggers the inverse parallel thyristor group to be turned on, the fault phase is directly grounded, and the voltage between the fault phase and the ground is pulled down, so that the accidents of arcing over voltage, cable burnout, personal casualty and the like in the continuous operation process after grounding are prevented.

The invention relates to a miniature circuit breaker which comprises a shell. An instantaneous system, an operating mechanism, a time delay system and an arc quenching system are arranged in the shell. The arc quenching system comprises an arc angle, an arc striking sheet and an arc extinguish chamber. The arc extinguish chamber is communicated with a gas outlet. A gas buffer room communicated with the arc extinguish chamber is arranged in the shell. The gas buffer room is communicated with the gas outlet. The miniature circuit breaker has the beneficial effect that a gas pressure in the breaking process is reduced, so that an electric arc can more easily enter the arc extinguish chamber, and the circuit breaker has a function of rapidly extinguishing the electric arc.

The invention provides an arc extinguishing device with an integral arc isolating cover, and an arc extinguishing method. The arc extinguishing device with the integral arc isolating cover comprises an arc extinguishing chamber and the arc isolating cover; the arc extinguishing chamber comprises a left arc isolating plate, a right arc isolating plate and a plurality of arc extinguishing grids; thecutting arc parts of all the arc extinguishing grids are arranged in a fan shape by taking a rotating shaft as a circle center, namely, in a direction from bottom to top; an inclination angle of arranging the cutting arc parts of the arc extinguishing grids is gradually increased; and an axis extension line of each arc extinguishing grid passes through the rotating shaft. The advantages are as follows: the arc extinguishing grids with different lengths and different thicknesses are designed in the arc extinguishing chamber, and the arc extinguishing grids are designed to be arranged in a fanshape in a staggered mode, so that rapid arc extinguishing can be realized, and the arc extinguishing effect can be improved. The service life, the breaking capacity, the use safety and the power supply reliability of a circuit breaker are prolonged and improved.

The invention provides an intelligent fuse, which comprises a shell, a conductive plate, an arc extinguishing structure, a cutting device and a driving device, and is characterized in that the shell is internally provided with a cavity channel and an arc extinguishing chamber, and the cavity channel is communicated with the arc extinguishing chamber; the current-conducting plate transversely penetrates into the shell, the current-conducting plate partially penetrates between the cavity channel and the arc extinguishing cavity, and the two ends of the current-conducting plate can be connected with an external circuit; the arc extinguishing structure is installed in the arc extinguishing chamber, an arc extinguishing groove is formed in the arc extinguishing structure, and the end portion of the side wall of the arc extinguishing groove abuts against the conductive plate; the cut-off device is movably arranged in the cavity channel and is used for moving from the cavity channel to the arc extinguishing cavity to cut off the conductive plate, and the part, cut off by the cut-off device, of the conductive plate enters the arc extinguishing groove; the driving device is used for receiving an external signal and driving the cut-off device to move from the cavity channel to the arc extinguishing cavity according to the external signal. Therefore, the intelligent fuse can disconnect the circuit according to the external signal so as to improve the adaptability of the intelligent fuse, and the arc extinguishing structure is used for carrying out rapid arc extinguishing on the conductive plate.

The invention relates to a linear permanent magnet motor operating mechanism of a high-voltage circuit breaker, comprising a stator core, a rotor core, drive rods and permanent magnets, wherein the stator core is a box body; the rotor core is arranged in the stator core; the drive rods arranged on both ends of the rotor core penetrate through shells positioned on the upper and the lower ends of the rotor core and can move up and down; the side wall of the stator core is provided with the permanent magnets; upper and lower adjacent permanent magnets are opposite in polarity; the permanent magnets positioned on the left and the right edges of the box body are same in polarity placement directions; stator salient poles with the number of integral multiples of a phase number are arranged on the inner side wall of the stator core and between the two adjacent permanents and are provided with armature coils; the outer side wall of the rotor core is provided with rotor salient poles; when therotor core is positioned on a highest position, the stator salient pole positioned on the uppermost end of the stator core just faces to the rotor salient poles; and when the rotor core is positionedon a lowest position, the stator salient pole positioned on the lowest end of the stator core just faces to the rotor salient poles.

The invention relates to a relay with arc quenching devices. The relay comprises a substrate, a coil, an armature, sliders, moving contacts and fixed contacts, wherein the fixed contacts are arranged on the substrate; the sliders are arranged on the armature; the moving contacts corresponding to the fixed contacts are arranged on the sliders; a through arc quenching placing cavity is formed on the substrate and is arranged on one side of the fixed contacts, corresponding to the moving contacts; arc quenching devices are arranged in the arc quenching placing cavity; the arc quenching placing cavity extends toward the moving contacts along the fixed contacts to form an arc quenching chamber; and points of the moving and fixed contacts are arranged in the arc quenching chamber. The relay has the following beneficial effects that: the arc quenching devices are arranged near the moving and fixed contacts of the relay, so that the arc generated when the moving and fixed contacts are pulled in and disconnected is quickly adsorbed and quenched to prevent the contacts from being burnt down, thus greatly prolonging the service life of the relay.

The invention discloses an arc extinguishing fuse with an open-circuit mark. Pipe caps are arranged at two ends of a pipe body, a partition plate is arranged in the pipe body, a fuse is arranged in afirst cavity, a first conductive sheet and a second conductive sheet are respectively arranged at two ends of the fuse, the first conductive sheet penetrates through a front pipe cape, the second conductive sheet penetrates through a rear pipe cape, a reset spring is arranged in the second cavity, one end of the reset spring is connected to an inner wall of the rear pipe cap, the other end of thereset spring is connected with a mark block, the mark block is movably clamped to the front pipe cap, a fuse wire is connected to a rear part of the reset spring, penetrates through the partition plate and is connected with the second conductive sheet, a fuse wire is arranged at a connection position of the mark block and the reset spring, penetrates through the partition plate is connected with the first conductive sheet, a sand injection hole is formed in the front pipe cap, and an arc extinguishing filler is arranged in the first cavity. The arc extinguishing fuse is simple in structure andreliable in working and is convenient to use.

The invention discloses a relay. The relay comprises an enclosure, a bottom plate and a driving device, wherein at least one static contact group is arranged on an enclosure, the static contact group comprises two static contacts, the two static contacts are isolated with each other, a baffle wall is arranged in the enclosure and is spaced between the two static contacts of the static contact group, at least one movable contact group corresponding to the static contact group is arranged on the bottom plate, the movable contact group comprises two movable contacts, a fuse is arranged on the bottom plate, the two movable contacts of the movable contact group are electrically conducted by the fuse, the bottom plate is movably arranged in the enclosure between a connection position where the movable contact group and the static contact group are in contact and a disconnection position where the movable contact group and the static contact group are separated, and the driving device is connected with the bottom plate so as to drive the bottom plate to move between the connection position and the disconnection position. According to the relay disclosed by the embodiment of the invention, the baffle wall is arranged, thus, an arc can be rapidly extinguished by the baffle wall during the connection and disconnection process of a plurality of static contacts, and the safety and the stability of the relay are improved.

Disclosed is a non-polarized low-voltage circuit breaker, relating to the technical field of electrical switches. The non-polarized low-voltage circuit breaker includes an operating mechanism, two static contact assemblies, a bridge type moving contact assembly and two arc extinguishing chambers. The bridge type moving contact assembly is arranged opposite to the static contact assemblies. The twostatic contact assemblies are input and output static contact assemblies. The bridge type moving contact assembly and the two static contact assemblies are cooperated to form a left moving and staticcontact fracture and a right moving and static contact fracture. The left and right moving and static contact fractures are closely adjacent to the matched arc extinguishing chambers. When a circuitis switched on and off, arc is formed between the left and right moving and static contact fractures and generated self-excited magnetic fields repel each other since the current directions of the arcare opposite to drive the arc at the left and right fractures to automatically enter the two arc extinguishing chambers to realize arc extinguishing. The circuit breaker has two switch fractures andtwo arc extinguishing chambers, the two switch fractures are connected in series, arc energy produced when the circuit is opened is born by the two fractures, and arc extinguishing is born by the twoarc extinguishing chambers, so that the circuit breaker is favorable for rapid arc extinguishing.

The invention provides a high-voltage vacuum extinction chamber, belonging to the technical field of high voltage electrical apparatus insulation, and aiming at realizing the purposes of increasing a transient turn-off current and extinguishing arc quickly. The high-voltage vacuum extinction chamber comprises a glass shade, and a static end cover board and a movable end cover board which are respectively fixed at two ends of the glass shade, wherein a static conducting rod fixed on the static end cover board and a movable conducting rod connected to the movable end cover board in a sliding manner are arranged in the glass shade; the inner end of the static conducting rod is provided with a static contact, the inner end of the movable conducting rod is provided with a movable contact as big as the static contact; a first static shade barrel covering the static contact and the static conducting rod inside, and a first movable shade barrel which is arranged by being symmetric to the first static shade barrel and covers the movable conducting rod inside, are arranged in the glass shade; the inner side faces of the opposite ends of the first static shade barrel and the first movable shade barrel are provided with spiral turned edges, and when the movable contact is disconnected with the static contact, the movable contact can move into the first movable shade barrel. The high-voltage vacuum extinction chamber can realize quick arc extinguishing and improve the instantaneous current interruption capability of the vacuum extinction chamber.

The invention discloses a reactive compensation and single-phase earth fault arc extinguishing system and method for a low-current grounding system. The system comprises an arc extinguishing control device and a three-phase star-connected multilevel converter. The input end of the arc extinguishing control device inputs bus three-phase voltage, zero-sequence voltage and zero-sequence current of each branch, and the output end of the arc extinguishing control device sends a control signal to the multilevel converter. The multi-level converter receives the control signal and outputs a specific voltage vector. Meanwhile, the invention further discloses an arc extinguishing method of the system. According to the invention, the voltage to ground of the fault phase voltage is controlled to be zero, the arc extinction of the grounding fault can be rapidly realized, the cable at the grounding position is prevented from being burnt by arc light and personal electric shock casualty accidents areavoided, the system after the single-phase grounding fault does not need to trip immediately and continuously and safely operates for a period of time, and the reliability and safety of the system are greatly improved.

The invention provides a PC-level large-current dual-power-supply automatic change-over switch, which comprises electromagnet driving mechanisms and a contact arc extinguishing mechanism, wherein the two electromagnet driving mechanisms are symmetrically arranged for three-section working, only one electromagnet driving mechanism is needed for two-section working, a driving electromagnet is provided with a thrust coil and a tension coil, a movable iron core pushes or pulls a gear transmission lever to perform action conversion, a contact four-connecting-rod mechanism is arranged on an action rotating shaft of a common power supply and an action rotating shaft of a standby power supply, an action interlocking device is arranged between the two action rotating shafts so as to obtain quick and large transmission torque on the action rotating shafts of the dual-power-supply automatic change-over switch, and due to the action of the four-connecting-rod mechanism and the interlocking device, stable work of the dual power supply under various working conditions can be ensured, so that the dual-power-supply automatic change-over switch with a simple structure and stable performance is suitable for power supply change-over under large current.

The invention discloses a composite insulated metallic oxide arrester which comprises a hollow insulation pipe (2), an umbrella skirt sleeve (3), a first metal end plate (4), a second metal end plate(5), a first metal elastomer (6), a discharge gap structure, a second metal elastomer (7) and zinc oxide resistance pieces (8) which are arranged in a stacking manner; the first metal elastomer (6), the discharge gap structure, the second metal elastomer (7) and the zinc oxide resistance pieces (8) are axially arranged in the hollow insulation pipe from top to bottom; and the first metal elastomer, the discharge gap structure, the second metal elastomer and the zinc oxide resistance chips are all form gaps (9) with the hollow insulation pipe in a radial direction of the hollow insulation pipe.By adopting variable series gap composite insulated metallic oxide arrester, during normal running, lightning overvoltage and operation overvoltage allowed by running voltage and electrical equipmentcan not be applied to the zinc oxide resistance chips, so that the phenomena of electrical aging and thermal destruction caused by long-term electrification are avoided, and meanwhile, the problem ofarcs caused by sustaining current between adjacent series gaps after overvoltage disappears can also be prevented.

The invention relates to gas-producing arc-extinguishing powder and a preparation method thereof. The gas-producing arc-extinguishing powder comprises fumed silica nano-powder with the heat conductivity coefficient equivalent to that of air, and an inorganic flame retardant, an organic flame retardant, modified melamino-formaldehyde resin and silicate are added so as to ensure that the arc-extinguishing powder can release gas when an electric arc is generated. The metal ion concentration and the collision probability are reduced, and a deionization effect is generated to quickly extinguish the arc. And the breaking capacity of the product is ensured to meet the DC 300V400A requirement.

The invention discloses a fault current transfer device for a direct-current system. The fault current transfer device includes a power electronic valve and an absorption resistor; the power electronic valve and the absorption resistor are connected in series to form a first branch; and the first branch is connected in parallel at two ends of a smoothing reactor and is used for transferring fault current which appears when a grounding fault occurs on the incoming line side of a direct-current circuit breaker; and the power electronic valve can be a one-way phase valve or a two-way valve so as to realize fault current transfer at different fault points. The fault current transfer device is used for transferring the fault current of the direct-current system, improving the protection margin of the MOV of the direct-current circuit breaker and achieving rapid extinction of the fault current so as to improve the success rate of the reclosing of the direct-current system.

The embodiment of the invention provides a protection circuit, a control method of the protection circuit, a telecommunication plug-in shelf device. The protection circuit comprises a sampling module, an equipment power supply loop, a processing module, a judging module and a drive module, wherein the sampling module is used for sampling from the equipment power supply loop to obtain a sampling signal, the equipment power supply loop is a circuit between a power supply in the telecommunication plug-in shelf device and at least one slot in the telecommunication plug-in shelf device, the processing module is used for accumulating and maintaining the sampling signal and obtaining a corresponding charge voltage after the sampling signal is accumulated, the judging module is used for comparing a charging voltage with a preset reference voltage and sending a control signal to a drive module when the difference value beween the charging voltage and the preset reference voltage is less than or equal to the preset threshold, and the drive module is used for receiving the control signal sent by the judging module and cutting off the equipment power supply loop according to the control signal. According to the technical scheme of the embodiment of the invention, arc can be rapidly extinguished, the arc discharge energy is prevented from being converged and enhanced, the fire is avoided, and the safety of the telecommunication plug-in shelf device is enhanced.

The invention relates to an electrical product and particularly relates to a bridge type contact load switch. The switch comprises two double-connecting-rod mechanisms which are symmetrically arranged, wherein each double-connecting-rod mechanism comprises a first connecting rod and a second connecting rod, one end of the first connecting rod rotates around a fixed shaft, the other end of the first connecting rod is hinged to the second connecting rod, the other end of the second connecting rod is hinged to a moving contact, in the process that the two first connecting rods synchronously rotate around the fixed shaft, the two second connecting rods synchronously drive the moving contact to move linearly, the moving contact comprises a mounting base hinged to the two second connecting rodsrespectively, spring pieces are arranged on the mounting base, two moving contacts are arranged at two ends, relative to the outer sides of the two mounting bases, of each spring piece and correspondto two fixed contacts which are fixedly arranged respectively, and two guide rails used for guiding the two mounting bases are further included. The switch is advantaged in that on one hand, arcing difficulty can be increased fundamentally, on the other hand, the contact area between an arc and the air can be increased, thereby quick arc extinguishing is achieved, and the invention further relatesto an intelligent electric meter.