72results about How to "Small operating power" patented technology

The invention discloses an arc-control device of a breaker, which comprises a piston rod, a piston, an air cylinder, a static contact, a moving contact and a nozzle, wherein the air cylinder is isolated by the piston to form a hot air chamber and a cold air chamber, the piston is sleeved at the periphery of the piston rod and is positioned between a first limiting surface and a second limiting surface of the piston rod, and the nozzle is provided with a first air channel and a second air channel which are respectively communicated with the hot air chamber and the cold air chamber. According to the invention, hot airflow of arc heating can enter the hot air chamber, and in arc blowout, the cold airflow in the cold chamber can blow away conductive particles, so that the phenomenon that in the traditional structure, the cutting-off is not successful due to heat breakdown and air bubbles of the airflow can be avoided; the mode of forming the pressure by pressure air of the piston and the mode of forming the pressure by arc heating expansion are integrated, so that the size of the arc-control device is reduced; through the limiting surfaces of the piston rod, the drive mode of the piston can automatically adapt to the magnitude of current; and the expansion pressure generated by arc drives the direction of the movement of the piston to be constant with the direction of the movement of the piston rod, so that the work of the breaker can be reduced.

The invention provides a dual-moving contact transmission device of a circuit breaker. The device has advantages of fast relative speed of contacts, low operation power of the mechanism, and low product cost. The dual-moving contact transmission device comprises a first connecting terminal and a second connecting terminal, a first contact assembly, a second arc contact, and a reversed transmission unit, wherein the first connecting terminal and the second connecting terminal are arranged coaxially. The first contact assembly includes a first pull rod, an air cylinder, a first arc contact, a nozzle, and a second pull rod, wherein the units are connected successively into one; one end of the reversed transmission unit is connected with the second pull rod and the other end is connected with a driving terminal of the second arc contact; the first pull rod is used for power inputting; and the reversed transmission unit is used for transmitting the motion and the force of the first pull rod to the second arc contact in parallel in a reversed manner. The horizontal motion of one pull rod is converted into horizontal motions of the two arc contacts. And the two arc contacts carry out opening or closing simultaneously, so that the relative speeds of the moving and static arc contacts increase and the operation power of the mechanism is reduced obviously.

The operating and driving mechanism applied to the driving mechanism in the breaker and switch disconnector etc. equipment includes following structure. The armature is fixed on the driving rod. The coil for detaching breaker (some time it can be left out), the permanent magnet, the pole shoes, the closing coil and the static iron core are set up around the circumference of the armature. The upper and the lower ends of the driving rod pass through the upper and the lower axial sleeves, which are inserted into the top end cover and the bottom end cover. There is the asistance mat slice on the bottom end cover. The top end cover is in the basin-typed structure. The static iron core, the top and the bottom end covers as well as the pole shoes can be made as the integrated piece.

The invention relates to a hydraulic operating mechanism for a high pressure switch and a hydraulic working cylinder of the hydraulic operating mechanism. The hydraulic working cylinder comprises a cylinder body which is provided with an inner cavity and a main piston which is assembled into the inner cavity of the cylinder body in a sealing sliding mode; an auxiliary piston independent to the piston rod is assembled in a rod cavity of the cylinder body along the left direction and the right direction in a sliding mode; the area difference exists between the total area of a left-side pressure acting surface, which is leftward and acted by hydraulic oil, of the auxiliary piston and the total area of a right-side pressure acting surface, which is rightward and acted by the hydraulic oil, of the auxiliary piston, and a left limiting structure and a right limiting structure for stopping the auxiliary piston at a left limiting part and a right limiting part in the motion stroke of the auxiliary piston are arranged in the rod cavity corresponding to the motion stroke set by the auxiliary piston. The hydraulic working cylinder provided by the invention reduces the acceleration after the motion speed of the piston rod meets the requirement; the hydraulic operating mechanism using the hydraulic working cylinder is further provided.

The invention discloses a double acting self energy thermal expansion type high pressure sulfur hexafluoride breaker arc extinguish chamber, comprising a breaker shell and a static contact mechanism, a moving contact mechanism, a cylinder and an operating mechanism which are fixed in the breaker shell in a sealing way, wherein the operating mechanism drives the moving contact mechanism to move; the static contact mechanism comprises a static main contact and a static arc contact, the moving contact mechanism comprises an arc extinguishing port, a moving main contact and a moving arc contact; the static contact mechanism also comprises a rotating shifting fork driving the static arc contact to move up and down and a guide rail for the static arc contact to move up and down; the moving contact mechanism also comprises a push-and-pull rod which is arranged above the arc extinguishing port and can move up and down along with the moving contact mechanism to correspondingly drive the shifting fork to rotate. The invention has novel and reasonable structure design, all components are compactly connected, and use operation is convenient and use effect is good, thus the actual problems that stroke of the moving contact is large and the required operation power is also high during opening and closing operations in use of the existing self energy type breaker arc extinguish chamber can be effectively solved.

The invention embodiment discloses a double-action type linkage mechanism for a circuit breaker, which includes a first linkage mechanism and a second linkage mechanism with the same structure, wherein any one linkage mechanism comprises: a first insulated pull rod, a first connecting plate, a crank, a support and a second insulated pull rod. The first insulated pull rod is connected with a first contact of the circuit breaker. One end of the first connecting plate is connected on a first insulated pull rod by a first pin and the other end is connected with one end of the crank by a second pin. The other end of the crank is connected with the other end of the second insulated pull rod one end of which is connected with the second contact of the circuit breaker, and the middle portion of the crank is connected with one end of the support by a third pin. The other end of the support is fixedly connected on an arc extinguish chamber shell of the circuit breaker. The invention embodiment greatly reduces the operation work of the extra-high voltage circuit breaker and successes to run with power in an extra-high voltage AC experiment demonstration project.

The invention discloses an automatic operating vacuum arc extinguish chamber and an automatic operating method thereof. The vacuum arc extinguish chamber comprises a static conductive rod, a movable conductive rod, a static contact, a movable contact, an arc extinguish chamber housing, a shielding cover, a flexible conductor, a main circuit terminal, a gate-opening driving coil, a magnetic repulsion disk, a gate-closing driving coil and a bistable retention structure. The invention discloses an automatic operating method of the automatic operating vacuum arc extinguish chamber. A conventional arc extinguish chamber and an operation mechanism are integrated to greatly reduce the part number and size of the operation mechanism and operation power of the mechanism. A bellows structure of a conventional arc extinguish chamber is eliminated, and the automatic operating vacuum arc extinguish chamber has the advantages of simple structure, compactness, long service lifetime and low cost.

The invention discloses a three-phase AC (Alternating Current) high-voltage vacuum contactor with a long service life, which can achieve 24kV voltage class and meet the requirements on one million-time mechanical life of a contactor. The three-phase AC high-voltage vacuum contactor with the long service life comprises a vacuum arc extinguish chamber arranged in an up-and-down structure, a soft connector, an insulating pull rod and a brake separating spring. A casing of the vacuum arc extinguish chamber is an integrated cylinder, the inner periphery of a shielding cylinder is provided with a convex ring of which the inner diameter is matched with the external diameter of the shielding cylinder, and the outer periphery of the shielding cylinder is connected with the inner periphery of the convex ring in a hermetic seal way; the radius of a wave trough of a corrugated tube is identical to that of a wave crest of the corrugated tube; the soft connector is formed by overlapping, tightly pressing and flattening a plurality of copper foil tapes with identical width and length; the insulating pull rod comprises a mandril of which the two ends are respectively provided with a blind hole, a connecting piece embedded in the blind holes of the mandril and an insulating sleeve sleeved outside the mandril in an attaching way, and the middle part of the outside surface of the insulating sleeve is provided with a plurality of layers of skirt rims at equal intervals; and a spring seat and a spring support seat of the brake separating spring are respectively and detachably installed on an armature and a substrate.

The invention relates to an air compression type arc extinction device and a high-voltage circuit breaker with the arc extinction device. The air compression type arc extinction device comprises a movable arc contact, a static arc contact, a nozzle, an air cylinder and a static contact base. The arc ends of the movable arc contact and the static arc contact are both provided with butt joint conductive end faces which face each other and are in opposite press fit in a switch-on state. The static arc contact is assembled on the static contact base in a guided and movable mode through a conductive rod in the switch-off and switch-on directions and is conductively connected with the static contact base. An over-travel spring is arranged between the static arc contact and the static contact base. The conductive rod is provided with a static arc contact anti-disengaging structure. At least one of the two arc contacts is provided with an axial through hole. The end, opposite to the corresponding butt joint conductive end face, of the axial through hole is communicated with an air chamber outside the air cylinder through a communication channel. The nozzle is provided with a clearance fit section which is in clearance fit with the corresponding outer circumferential face of the static arc contact in the switch-off and switch-on travels. According to the air compression type arc extinction device, the movable arc contact and the static arc contact can be prevented from being abraded in the switch-off and switch-on processes and the requirement for coaxiality can be lowered when the movable arc contact and the static arc contact are assembled.

The present invention relates to a high-voltage vacuum circuit-breaker. It is composed of upper wiring flange, lower wiring flange, arc extinguishing unit, frame, supporting frame and control box. The frame is fixedly mounted on the supporting frame, the three-phase arc extinguishing unit is fixedly mounted on the frame, all the movable components of said arc extinguishing unit are mechanically connected on the spring mechanism in the control box, the arc extinguishing unit is characterized by that in its arc extinguishing chamber a vacuum tube is mounted, and its movable contact and static contact are mounted in the vacuum tube.

The invention relates to a three-station isolation grounding switch, comprising a moving contact seat (3); an insulation rod (7) is rotationally provided on the moving contact seat; the insulation rod is provided with a power input end and a power output end provided with a gear (8); a moving contact (4) is movably and guidedly provided in the moving contact seat; the moving contact is fixedly provided with a rack (6) extending along a moving direction thereof and engaged with the gear; an installation chamber with the rack assembled therein is disposed in the moving contact; the power output end of the insulation rod penetrates into the installation chamber; the gear engages with the rack in the installation chamber; and the moving contact is provided with a long guiding hole (9) for guidedly matching the insulation rod along the moving direction. The three-station isolation grounding switch provides both the rack and the gear in the installation chamber, thus greatly improving the distribution of the electric field around the insulation rod, allowing for a small internal diameter of the housing of the isolation grounding switch.

The invention discloses an elastic pressure relief system for reducing breaker operation work. The elastic pressure relief system comprises a nozzle, a movable arc contact, a cylinder, a first flange, a second flange, a pull rod and a cylinder seat. The lower portion of the nozzle is fixed on the upper portion of the inner side of the cylinder, the upper portion of the nozzle extends out of the inner side of the cylinder, the upper end of the movable arc contact extends into the nozzle, an interval is reserved between the movable arc contact and the nozzle, and the lower end of the movable arc contact is connected with an inner side wall of the cylinder through the first flange. The lower portion of the cylinder is sleeved on the cylinder seat, an upper end cover of the cylinder seat is provided with the second flange, and the pull rod penetrates through the second flange to be fixedly connected with the first flange and drives the first flange to drive the cylinder to move. The first flange, the cylinder and the second flange are enclosed to form an air pressing chamber, and a pressure reducing valve and an air returning valve are arranged on the second flange. The pressure relief system is simple in structure, can effectively reduce the breaker operation work and does not influence arc quenching effect.

The invention relates to a self-energy dual-acting arc extinguishing chamber, and belongs to the technical field of a high-voltage switch. The automatic arc extinguishing chamber comprises a movable end part and a static end part, wherein the movable end part comprises a movable end pull rod, an air cylinder, an expansion chamber and an auxiliary nozzle, the static end part comprises a static arccontact, an arc extinguishing nozzle and a connection rod structure, the auxiliary nozzle is fixedly connected with the arc extinguishing nozzle, the static arc contact can be driven to achieve equal-speed deviation motion during the motion process of the movable end pull rod, the static arc contact is provided with a piston, an outer wall of the piston is matched with an inner wall profile of thearc extinguishing nozzle, a gap is formed between the outer wall of the piston and the inner wall profile, an air guide passage is formed in the static arc contact and communicates with a surface ofthe piston from an axis, high-voltage gas generated by an arc flows into an enclosed region formed between the piston and the arc extinguishing nozzle through the air guide passage, and the capacity of the expansion chamber is equivalently expanded. The self-energy dual-acting arc extinguishing chamber is provided with the air cylinder, the expansion chamber and an auxiliary piston, a three-air chamber structure is formed during the breaking process, the arc extinguishing speed is rapid, and an effect is good.

The invention discloses a rotary air-compressing load switch and a nozzle assembly thereof. The nozzle assembly comprises a rotary piston installed in a cylinder and a movable contact knife. The top of the rotary piston is inwardly recessed to form an air outlet corresponding to the cylinder. The air outlet is provided with a first lateral side and a second lateral side. The movable contact knife corresponds to the cylinder, is fixedly connected with the inner side of the rotary piston, and comprises a first blade and a second blade in parallel. Gaps are arranged between the first blade and the second blade, the first lateral side and the first blade and / or the second blade and the second lateral side such that a main nozzle, a first lateral nozzle and / or a second lateral nozzle are formed. Therefore, when the rotary piston rotationally compresses air in the cylinder, the air fast erupts from the air outlet via the nozzles. The nozzle assembly may control arc at a position which is the most beneficial to arc extinction and extinguishes the arc at the highest speed.

The invention relates to an electric spring operating mechanism belonging to the technical field of a high-voltage power switch. The electric spring operating mechanism comprises a base, a motor, a transmission shaft assembly, a lead screw assembly and a spring assembly, wherein the transmission shaft assembly is fixedly arranged on the base; one end of the spring assembly is connected with the base, and the other end of the spring assembly is connected with the transmission shaft assembly; both ends of the lead screw assembly are fixedly arranged on the base and are connected with the transmission shaft assembly; and the motor is connected with the lead screw assembly in a meshing mode. The invention satisfies the driving task of a fast grounding switch in a GIS (Gas Insulated Switchgear) so as to achieve the functions of fast switching-on and slow switching-off of the fast grounding switch. Besides, the electric spring operating mechanism has the advantages of simple structure, beautiful appearance, stable performance and high reliability.

The invention relates to an operating mechanism, and in particular designs a permanent magnet operating mechanism for a circuit breaker. The permanent magnet operating mechanism for a 50 kA vacuum circuit breaker comprises a main shaft, a transmission mechanism, a permanent magnet mechanism, a holding module and magnet steel which is matched with the holding module, wherein the holding module comprises a magnet steel shell. The permanent magnet operating mechanism is characterized in that the holding module adopts a multi-ring and multi-magnetic pole structure; and the multi-ring and multi-magnetic pole structure comprises a plurality of magnetic rings with different diameters, and the magnetic rings are arranged sequentially by taking a central shaft of the magnet steel shell as a center to form the multi-ring and multi-magnetic pole structure. The permanent magnet operating mechanism has the characteristics of big holding force at an on-position, little operation power of the permanent magnet operating mechanism, good compatibility, reliable performance and the like.

The invention relates to an arc extinguishing chamber of a DC breaking device. The arc extinguishing chamber of the DC breaking device includes a static end assembly and a moving end assembly, the moving end assembly includes a moving contact device, a pressure cylinder and a nozzle, the moving contact device includes a moving contact body, and the pressure cylinder includes a cylindrical cylinder body , the front part of the inner peripheral wall of the cylinder body has a movable contact mating section which is sleeved on the corresponding outer peripheral surface of the movable contact body and electrically connected with the movable contact body, and the rear part of the inner peripheral wall has a corresponding movable contact seat The moving contact seat matching section of the guide assembly, the inner diameter of the moving contact fitting section is larger than the inner diameter of the moving contact seat matching section, and there is an inner diameter between the moving contact fitting section and the moving contact seat matching section. The rear end opening of the gas channel in the contact device corresponds to the flaring structure, and the nozzle is fixed on the moving contact body corresponding to the front opening of the gas channel. The above-mentioned arc extinguishing chamber of the direct current breaking device can reduce the pressure and gas reaction force, reduce the burden of the operating mechanism, and reduce its operating work under the condition of meeting the flow capacity.

The invention relates to a vacuum circuit breaker, and especially relates to a double-side breaking technique for a vacuum circuit breaker. The technique can lower the operating power of an operate mechanism and has high-breaking performance. The vacuum circuit breaker comprises a vacuum circuit breaker body. The vacuum circuit breaker body comprises a double-side magnetic drive mechanism, an electrode system and a double-side main conductive loop. The electrode system comprises a first movable electrode component and a second movable electrode component. The double-side magnetic drive mechanism comprises a first magnetic drive mechanism and a second magnetic drive mechanism. The double-side main conductive loop comprises a first main conductive loop and a second main conductive loop. The first magnetic drive mechanism is connected to the first movable electrode component and drives the first movable electrode component to realize connecting with or disconnecting from the second movable electrode component through relative movement. The second magnetic drive mechanism is connected to the second movable electrode component and drives the second movable electrode component to realize connecting with or disconnecting from the first movable electrode component through relative movement.

The invention relates to a transmission mechanism and a three-position switch using the same. The three-position switch comprises a transmission mechanism, an isolating moving contact and an isolating static contact. The transmission mechanism includes an isolating slide and a grounding slide of which the axial extension lines intersect with each other. A driving crank arm is hinged to the intersection. An isolating connector and a grounding connector are hinged to the driving crank arm. An isolating slider and a grounding slider are respectively assembled in the isolating slide and the grounding slide in a guide sliding manner. The isolating moving contact and a grounding moving contact are respectively mounted on the isolating slider and the grounding slider. The isolating connector is hinged to and fixedly connected with the isolating slider. The grounding connector is hinged to and fixedly connected with the grounding slider. Compared with the prior art, the moving distance of the grounding moving contact is smaller than that of the isolating moving contact when the isolating moving contact moves to the closing position, and the moving distance of the isolating moving contact is smaller than that of the grounding moving contact when the grounding moving contact moves to the closing position, both of which reduce the operation work needed by the transmission mechanism.

The invention discloses a grounding loop moving / static contact device for a load switch, belonging to the field of a high voltage switch gear. The invention provides a moving / static contact device which is characterized in that the capacity of arc resistance is strong, the electric field is uniform and two stations are designed in a direct-acting mode. The grounding loop moving / static contact device for a load switch comprises a static contact device, a conductive electrode, a moving contact device and a crank arm, wherein the moving contact device and the static contact device are arranged on the same axis; the moving contact device comprises an cylindrical intermediate electrode provided with contact blade slots at two ends, a sleeve and the conductive electrode, multiple contact blades are arranged in the contact blade slots, the conductive electrode is arranged in the cylinder of the intermediate electrode, the conductive electrode is communicated with the contact blade at the tail end of the intermediate electrode, the intermediate electrode is arranged in the sleeve, a guide slot is arranged on the outer surface of the sleeve, a boss is arranged at one end of the crank arm, the boss on the crack arm slides in the guide slot of the sleeve and drives the moving contact device to do a reciprocating motion along the axis.

The invention relates to a pneumatic cylinder and a dynamic end assembly using same for a direct-current converting switch. The pneumatic cylinder comprises a cylindrical cylinder body; a dynamic contact matching section, which sleeves the external circumferential surface of a corresponding part of a corresponding dynamic contact device, is arranged at the front part of the internal circumferential wall of the cylinder body; a dynamic contact seat matching section for guiding and assembling a corresponding dynamic contact seat is arranged at the rear part of the internal circumferential wall of the cylinder body, wherein the inside diameter of the dynamic contact matching section is more than that of the dynamic contact seat matching section; an opening expanding structure, which corresponds to an opening in the rear end of an air channel in a dynamic contact device, is arranged between the dynamic contact matching section and the dynamic contact seat matching section, wherein the opening expanding structure is that the inside diameter of the front is large, and the inside diameter of the back is small. According to the pneumatic cylinder and the dynamic end assembly using the pneumatic cylinder for the direct-current converting switch, air can be blown out smoothly through the opening expanding structure; the diameter of the dynamic contact matching section can be increased to improve the flowing capability; the diameter of the dynamic contact seat matching section can be reduced to reduce the contact area between the dynamic contact seat and the air in a pneumatic air chamber, and therefore, the pneumatic counterforce can be reduced, the load on an operating mechanism can be lowered down, the operation action is decreased, and as a result, the stability of the whole transmission system can be improved.

The invention discloses an automatic operating vacuum arc extinguish chamber and an automatic operating method thereof. The vacuum arc extinguish chamber comprises a static conductive rod, a movable conductive rod, a static contact, a movable contact, an arc extinguish chamber housing, a shielding cover, a flexible conductor, a main circuit terminal, a gate-opening driving coil, a magnetic repulsion disk, a gate-closing driving coil and a bistable retention structure. The invention discloses an automatic operating method of the automatic operating vacuum arc extinguish chamber. A conventional arc extinguish chamber and an operation mechanism are integrated to greatly reduce the part number and size of the operation mechanism and operation power of the mechanism. A bellows structure of a conventional arc extinguish chamber is eliminated, and the automatic operating vacuum arc extinguish chamber has the advantages of simple structure, compactness, long service lifetime and low cost.

The invention relates to a compressed air type arc extinguishing chamber capable of moving in two directions. The compressed air type arc extinguishing chamber comprises a double-acting hydraulic cylinder, and the double-acting hydraulic cylinder comprises a cylinder body; the cylinder body is fixed at a static end assembly, an inner cavity and an outer cavity are formed in the cylinder body, a static piston rod is arranged in the inner cavity, the movable piston rod and the static piston rod respectively comprise a plug body and a rod body, and the rod bodies of the static piston rods comprise a first rod body and a second rod body; the outer chamber is an annular chamber and surrounds the outer side of the inner chamber, and a movable piston rod is arranged in the outer chamber; the movable end assembly is in transmission connection with the movable side rod body so as to drive the movable side rod body and the movable side plug body to move forwards and backwards during opening and closing; the static arc contact is fixed on the static piston rod; cavity communicating channels are formed in the two axial ends of the double-acting hydraulic cylinder correspondingly and used for communicating the corresponding ends of the inner cavity with the corresponding ends of the outer cavity, so the static piston rod and the movable side rod body are in linkage, and the movable end assembly is buffered. The double-acting structure can meet the double-acting requirement of the compressed air type arc extinguishing chamber under the working conditions of high voltage class and strong impact.

The invention relates to a self-driven arc extinguishing chamber for a double acting type high voltage SF6 breaker. The self-driven arc extinguishing chamber comprises an upper contact system and a lower contact system which cooperate with each other, wherein in the upper contact system, a lever passing through an axle pin covers onto an upper contact support, one end of the lever is connected with a shifting fork on an upper arc contact rod through a lever pin, and an upper arc contact is electrically connected with the upper contact support; and in the lower contact system, a pull rod is connected with the transmission crankarm of an operating mechanism through an insulating pull rod, and a lower arc contact fixed at the top end of the pull rod is electrically connected with a lower contact support. The self-driven arc extinguishing chamber for the double acting type high voltage SF6 breaker enables the upper and lower contacts to move oppositely when being turned off, thereby increasing rigid separation speed, ensuring heavy-current turning-off, and simultaneously ensuring light-current turning-off without repeated breakdown. The operating power of a breaker only corresponds to 1 / 2 of the operating power of a single acting type breaker, thereby greatly reducing the operating power of the operating mechanism, such that the operating power of the double acting type high voltage SF6 breaker is reduced to be 1 / 9 of the operating power of a pneumatic breaker, thereby ensuring the turning-on and turning-off performance of the breaker.

The invention discloses a GIS (Gas Insulated Switchgear) novel arc extinguishing structure comprises a first gas-guide cylinder and a second gas-guide cylinder, wherein the first gas-guide cylinder and the second gas-guide cylinder discharge top and bottom and are fixedly connected through bolts; a plate is arranged above the first gas-guide cylinder and on the inner wall of an arc extinguish chamber, and the plate has a plurality of circular holes; the first gas-guide cylinder and the second gas-guide cylinder are arranged in the arc extinguish chamber; the plate is made of brass materials; the first gas-guide cylinder and the second gas-guide cylinder both comprise round pipes and fixed rings; the fixed ring has the plurality of circular holes; the lower end of the second gas-guide cylinder is provided with a plurality of avoiding openings. The device disclosed by the invention has the advantages of simple structure, good arc extinguishing property, reliability in movement and long service life, reduces the operation work of a mechanism and the height of an integral static contact and is favorable to the development of miniaturization.

The invention provides a three-position switch with switching on and self-locking functions. The switch comprises three fixed contacts (1, 2 and 5) and a movable contact (10). The movable contact (10) and the fixed contacts (1, 2 and 5) are always in good contact. Moreover, the movable contact (10) can rotate around a shaft (O2) between the fixed contact (1) and the fixed contact (2). The movable contact (10) is driven by a link mechanism (3, 4, 6, 7, 8, 9 and 11). A power shaft (O3) is arranged for providing driving force. The fixed contact (5) is connected with the fixed contact (1) and the fixed contact (2) through the movable contact (10). When the three-position switch is switched on, a crank arm of the link mechanism is located on the same straight line with connection plates (3 and 4) or connection plates (6 and 7), and the crank arm is in a dead point state; when the movable contact (10) is an active piece, the crank arm and the connection plates (3 and 4) or connection plates (6 and 7) can not move.

The invention discloses a circuit breaker phase-selection opening and closing device and a control method. The circuit breaker phase-selection opening and closing device comprises a circuit breaker and a circuit breaker opening and closing control system, and is characterized in that the circuit breaker comprises a first pole column, a second pole column and a third pole column, the first pole column, the second pole column and the third pole column are internally provided with a pressure sensor, the first pole column, the second pole column and the third pole column of the circuit breaker areprovided with a displacement sensor at the bottom, and the opening and closing control system comprises a main controller, a temperature sensor, a timer, a first driving circuit, a second driving circuit, a third driving circuit, a first motor, a second motor, a third motor, a wireless communication circuit, a first opening and closing operating mechanism, a second opening and closing operating mechanism and a third opening and closing operating mechanism. The circuit breaker phase-selection opening and closing device has a function of real-time compensation and a characteristic of stable opening and closing time.