839 results about "Breaking capacity" patented technology

A surface mount fuse includes a plurality of substrate / arc suppressive layers, a plurality of fusible elements positioned between the substrate / arc suppressive layers and terminations connected to the ends of the fusible elements, such that the fusible elements are electrically connected in parallel. The surface mount fuse has greater amperage and voltage ratings than similarly sized conventional surface mount fuses. Additionally, the surface mount fuse has increased interrupt breaking capacity and superior mechanical properties.

The invention relates to a circuit breaker and a realization method thereof, and specifically relates to a mixed high-voltage direct-current circuit breaker and a realization method thereof. The direct-current circuit breaker is based on the principle of secondary current transfer. A main branch is composed of a quick-action mechanical switch and a current transfer module which contains a full-controlled device, which ensures the advantages of low loss and flexible current transfer control in the state of normal conduction. A first current transfer branch is composed of half-controlled device thyristors connected in series, so that the circuit breaker has strong fault flow capacity and breaking capacity, 'zero voltage and zero current' of the mechanical switch can be maintained long enough, and arc-free switching of the mechanical switch is realized. A second current transfer branch is composed of capacitors with pre-charged voltage, an inductor, and series-connected thyristors. After the thyristors of the first current transfer branch are reliably switched off, the capacitors quickly build up direct voltage high enough to resist the system, and an energy absorption circuit limits the voltage of the capacitors. Thus, the size and cost of the capacitors are well controlled.

The invention provides a current limited soft connecting / disconnecting device. The device is characterized in that a first winding L1 of a tight coupling double-winding reactor is connected with a first circuit breaker K1 in series, and then is connected with a second winding L2 in parallel; a single branch winding can be connected and disconnected by adopting a circuit breaker with a breaking capacity of 50 percent of short circuit current; after the first winding L1 is disconnected, the reactance of the tight coupling double-winding reactor is increased fast, and the short circuit current of the system is reduced. As the reactance values of various branch windings of the tight coupling double-winding reactor are rationally designed, the tight coupling double-winding reactor can be operated in small reactance and affects the system operation little when the system runs stably; while when the short circuit failure exists, the reactance value of the tight coupling double-winding reactor is increased to a rated reactance of the system, if the system is in a temporary fault, a second circuit breaker K2 is not needed to be disconnected; after the first circuit breaker K1 automatically switches on again, if the short circuit current of the system still exceeds the standard, the first circuit breaker K1 and the second circuit breaker K2 are disconnected in sequence.

The invention discloses a parallel inductance current-limiting circuit breaker, in particular to a high-capacity protection device of short-circuit fault, belonging to the protection device of short-circuit fault in electric power system, which comprises a plurality of parallel coils, a plurality of protective resistances, an auxiliary circuit breaker and a main circuit breaker. The ends of the first coil are connected with the contrary ends of the second coil and the coupling coefficient is 1. The first coil is connected in parallel with the first protective resistance, and then is connectedin series with the auxiliary circuit breaker. The second coil is connected in parallel with the second protective resistance, and then is connected in series with the main circuit breaker. The whole device is connected in series with the main system. When the control circuit detects the short-circuit fault in the main system, the control signal is sent, the auxiliary circuit breaker is switched on first and is connected in parallel with the inductance for decoupling, so the fault current is limited to a certain level, and then the main circuit breaker is switched on, so the fault current is completely cut off. The invention aims at overcoming the shortcoming of insufficient breaking capacity of prior circuit breakers, improving the breaking capacity and effectively cutting off fault current. The invention has the advantages of low loss, low operating cost, and ability of significantly improving the breaking capacity of the circuit breaker and effectively cutting the fault current off.

A zero-loss depth current-limiting protection device relates to the technical field of over-voltage absorption in a power system. The protection device is characterized in that the device comprises a Rogowski coil, a measurement and control unit, a high-speed switch and a depth current-limiting reactor 1, wherein the measurement and control unit is connected with the Rogowski coil and the high-speed switch, and the two ends of the depth current-limiting reactor 1 are connected with the two ends of the high-speed switch respectively. The device is fast in speed, high in breaking capacity and good in current-limiting effect, not only can protect electrical equipment of a transformer and a motor and the like in a system, but also improves service life of a load vacuum circuit breaker at a short circuit point.

The invention provides a high voltage direct current circuit breaker topology circuit which comprises a main branch, a current transfer branch and an energy absorption branch. The main branch, the current transfer branch and the energy absorption branch are connected in parallel. According to the high voltage direct current circuit breaker topology circuit provided by the invention, the structure of a circuit topology is simple; a stable current zero crossing point is in a breaking process; and the high voltage direct current circuit breaker topology circuit has the advantages of convenient control, flexible application, easy realization, high current breaking capacity, high withstand voltage level, high expansibility and low equipment cost.

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 circuit breaker breaking capacity evaluation method based on a full current equivalence principle, which belongs to the field of power grid safety stability and control. A concept of a full current effective value is introduced to evaluate the energy released by arcs of the circuit breaker during an arc extinguishing process; when short circuit happens to the power system, the short circuit current contains a periodic component and a DC component, a short circuit point DC component decay time constant in an actual operation working condition is solved; if the constant exceeds a circuit breaker standard decay time constant, evaluation on the circuit breaker short circuit current breaking capacity is carried out through a full current effective value equivalence principle in the circuit breaker actual operation working condition and a standard operation working condition; and finally, through comparing the circuit breaker breaking capacity and the short circuit current in the actual working condition, risk points existing in operation of the power grid are found out. The short circuit current actual breaking capacity of each type of circuit breakers can be effectively evaluated, and basis is provided for short circuit current suppression measure making and circuit breaker model selection in the power grid.

The invention discloses a low-voltage breaker, belonging to the technical field of low-voltage breakers. The low-voltage breaker comprises a shell, at least one circuit breaking and arc extinguishing device, an operation mechanism capable of cutting off or closing and a tripping device. The circuit breaking and arc extinguishing device comprises an arc extinguishing chamber component and a contact component. The arc extinguishing chamber component comprises a plurality of arc extinguishing grid plates and an arc isolating cover. Each arc extinguishing grid plate is provided with a basal part and a pair of extending legs extending from one end of the basal part, the arc isolating cover is provided with a pair of first wall bodies, a pair of second wall bodies and a pair of third wall bodies, a plurality of arc extinguishing grid plates form a contact cavity, the contact component corresponds to the contact cavity, and the second wall bodies correspond to the interior of the contact cavity. The invention is characterized in that the arc isolating cover also comprises a pair of inner walls, each inner walls is jointed with one end of each second wall body near the basal part of each arc extinguishing grid plate, the other end of each second wall body is jointed with each third wall body, and each inner walls is provided with grids. The invention prevents ablation of electric arcs to the extending legs, can protect the extending legs, prolongs the service life of the arc extinguishing chamber component, achieves fast arc extinguishing effect, and enhances the breaking capacity.

The invention relates to a voltage-source-converter-based direct-current fault current-limiting module and a protection plan. The current-limiting module installed at positive and negative electrodes of a direct-current side outlet of a voltage source converter consists of a full-control transistor T and a current-limiting resistor Rlim. When a direct-current system works normally, the full-control transistor T is in a conduction state all the time and the current-limiting resistor is in a bypass state. After a fault occurs at the system, the full-control transistor T in the current-limiting module is turned off according to an action signal sent by out converter protection and thus the fault current in the current-limiting module only flows through the current-limiting resistor; and on the basis of comparison of data collected at the direct-current side with various setting conditions, whether a fault occurs at the system and whether the fault occurs at an alternating-current side or the direct-current side are determined. Compared with the prior art, the voltage-source-converter-based direct-current fault current-limiting module and a protection plan are simple and reliable; and over-current influences of the alternating-current side, the direct-current side, and the converter can be limited in an allowed range, so that the breaking capacity requirement of a direct-current circuit breaker can be reduced.

The disclosure relates to an electrical switching device, e.g., a generator circuit breaker, and to a method for improved switching-gas cooling. Gas jets are formed by a nozzle body in the exhaust area, are directed against a baffle wall and are swirled. The baffle wall is a component of the switching chamber enclosure and has a high thermal capacity and / or thermal conductivity, so that the switching gas vortices produce a highly efficient switching gas cooling on the baffle wall by turbulent convection. Exemplary embodiments relate inter alia to the design of the baffle wall and of the nozzle body. Advantages include: protection of the switching chamber enclosure against hot gases, improved switching gas cooling, and increased breaking capacity.

The present disclosure provides an arc-free DC circuit breaker that combines magnetic induction transfer and resistive current limiting. The circuit breaker comprises a main current circuit and a transfer current circuit. The transfer current circuit has a bridge structure; with a group of unidirectional components having a breaking function, bidirectional current breaking is implemented, such that compared with the prior art, usage of the turn-off devices may be reduced to half. By controlling action sequences of the trigger gap, high-speed switch, and power semiconductor, fast switching arc-free opening of the main current circuit is implemented; meanwhile, the breaking capability of the circuit breaker is significantly improved. By virtue of the current limiting module circuit inside the transfer current circuit, the present disclosure quickly limits short-circuit fault current, and then reduces the number of parallel groups of full-controlled devices of the breaking module circuit. Compared with the existing circuit breaker structures, usage of turn-off devices and cost of the circuit breaker may be significantly reduced.

The invention discloses an air-swirl type spout high-voltage gas-blast circuit breaker with vanes, relating to the electrical switch field. The invention comprises a piston, an air cylinder, movable main contacts, movable arc contacts, stationary main contacts, stationary arc contacts and a spout; vanes are evenly arranged at the circumference of the inner wall of the upper part of the spout at which the spout and the movable arc contacts are formed into an air channel, so an air swirl area is formed. The axial movement of the air flow passing through the upper part of the spout is automatically converted into rotary movement, so the arc-extinguishing ability and the breaking capacity of the gas-blast circuit breaker are enhanced.

The invention relates to the technical field of arc-extinguishing materials, in particular to an arc-extinguishing material for a fuse and a preparation method of the arc-extinguishing material. The arc-extinguishing material is obtained by mixing silicon dioxide, microcrystalline cellulose, liquid resin and water, extruding through extrusion equipment and then rolling to form a sphere. The component purity and filling density of a filling material of the fuse are effectively controlled, and corresponding heat conduction coefficients can be configured according to the characteristic requirement of the fuse; and an electric arc can be effectively prevented from being formed and diffused, and the breaking capacity of the fuse is remarkably improved.

The invention relates to a breaker with a forced flash barrier device. The breaker comprises a shell, a movable contact and a fixed contact, wherein the shell is internally provided with a lever made of an insulating material and composed of a left moment arm, a right moment arm and a fulcrum, the left moment arm of the lever is inserted into a gap between the movable contact and the fixed contact since the right moment arm is pushed rightwards by the movable contact during the separation process of the movable contact and the fixed contact, and the left moment arm of the lever goes out of the gap between the movable contact and the fixed contact since the left moment arm is pushed leftwards by the movable contact during the closing process of the movable contact and the fixed contact. The breaker is simple in structure and reliable in movement, can quickly cut off an electric arc when the movable contact and the fixed contact are separated so as to improve arc voltage, increase the breaking capacity and the current-limiting capacity of the breaker, widen the application range of the breaker and realize reversible protection.

The invention relates to a super voltage circuit break quadruple speed section contact used in power device. It designs the fixed contact into connecting the spring with the insulating case; the fixed contact moves with the moving contact on the force of friction and extends the spring, the fixed contact moves to the dead point and suddenly separates the moving contact and generates the opposite speed moving with the moving contact.

The invention relate to breaker, especially to super high-voltage circuit breaker in use for GIS. The disclosed breaker includes breaking contactor mechanism, and operating mechanism for switching on / off resistances, and controlling action of breaking contactor mechanism. Through pull rod and regulating lever, one set of operating mechanism can control two sets of breaking contactor mechanism since technique of adjusting compression spring for moving contactor is utilized. The invention possesses breaking function at double speed, reduces kinetic resistance of moving contactor, and quickens breaking speed. Stepped breaking technique adopted in the invention lowers over voltage of operation greatly, as well as increases rated capacity and breaking capacity greatly. The invention also reduces cost of equipment and difficulties for manufacturing the disclosed breaker.

The invention relates to the field of manufacturing and design of high-voltage switches and discloses an arc extinguish chamber structure for lifting an arc voltage. The structure comprises a fixed piston and a pull rod moving in an inner hole of the piston; a relative position of an air current channel is designed to realize staged blocking and opening; and simultaneously the structure has an extended moving arc contact surface, so that the variation range of an arc length is enlarged. The structure can increase the amplitude and jump of the arc voltage and fulfills the aim of enhancing the breaking direct current, the volume and the sensitive small-current breaking capacity of a circuit breaker.

The invention relates to a quick trip breaker with the function of pneumatic actuation trip, which comprises a plurality of single-stage breaking units and an operation mechanism with a shared trip rod, wherein each of the single-stage breaking units comprises a shell, a contact device, an arc control device, a wiring device, an over-current trip device and a pneumatic trip device consisting of actuation mechanisms and transmission mechanisms. One single-stage breaking unit is provided with one or two sets of transmission mechanisms in coupled connection with the actuation mechanisms of the single-stage breaking unit, so the transmission mechanisms can be shared by two adjacent breaking units, and the trip action of the actuation mechanisms of the two adjacent breaking units can be transmitted to the shared trip rod of the operation mechanism through a contact arm. One single-stage breaking unit is provided with one or two sets of actuation mechanisms which can transmit the trip action of the stage breaking unit to the transmission mechanism on the connection side synchronously. The breaker has the function of quick trip, and can improve breaking capacity to the maximum, simplify assembly, make the action more reliable, and provide convenience for on-site maintenance.

The invention discloses an air-swirl type spout high-voltage gas-blast circuit breaker with grooves, belonging to the electrical switch field. The invention comprises a piston, an air cylinder, movable main contacts, movable arc contacts, stationary main contacts, stationary arc contacts, a cover for the moveable arc contacts and a spout. The invention is characterized in that spiral grooves are evenly arranged axially in an air flow channel formed by the spout and the cover for the movable arc contacts, or on the inner surface of the spout, or on the outer surface of the cover for the movable arc contacts, or on the inner surface of the spout and the outer surface of the cover for the movable arc contacts , so an air swirl area is formed, and the arc-extinguishing ability and the breaking capacity of the gas-blast circuit breaker are enhanced.

The disclosure relates to an electrical switching device, e.g., a generator circuit breaker, and to a method for improved switching-gas cooling. Gas jets are formed by a nozzle body in the exhaust area, are directed against a baffle wall and are swirled. The baffle wall is a component of the switching chamber enclosure and has a high thermal capacity and / or thermal conductivity, so that the switching gas vortices produce a highly efficient switching gas cooling on the baffle wall by turbulent convection. Exemplary embodiments relate inter alia to the design of the baffle wall and of the nozzle body. Advantages include: protection of the switching chamber enclosure against hot gases, improved switching gas cooling, and increased breaking capacity.

The invention discloses a DC load isolation switch, which comprises an isolation switch and a load switch, wherein the isolation switch comprises a moving contact busbar and a crankshaft mechanism; an insulated operation rod is connected onto the crankshaft mechanism; isolation knives are arranged on the moving contact busbar; the end part of the insulated operation rod is connected with the isolation knives; conductive wheels are arranged on the isolation knives; the load switch comprises a static contact busbar, a fast operation mechanism and an arc extinguishing chamber; a static contact is arranged on the static contact busbar; and U-shaped conductive forks corresponding to the conductive wheels are arranged on the fast operation mechanism. The DC load isolation switch of the invention adopts a structure form of combining the load switch and the isolation switch, the isolation switch part uses a structure of an upper knife and a lower knife, normal load current in a line can be opened and closed, functions of the isolation switch can be integrated, and the DC load isolation switch has the advantages of compact structure, strong opening ability, convenient mounting and maintenance and the like.

The invention discloses a non-polar hydrogen mixed gas DC (direct-current) arc extinction system for a DC contactor. The DC arc extinction system comprises a moving contact, four pairs of moving and static arc striking contacts, a static contact, a grid group and a permanent magnet. The non-polar hydrogen mixed gas DC arc extinction system is non-polar, namely the arc extinguishing property can not be influenced by the change of the current direction. According to the non-polar hydrogen mixed gas DC arc extinction system, the arc striking contacts strike electric arc to smoothly move along a track of the arc striking contacts, the arc striking contacts, the grid group and the permanent magnet are reasonably arranged, and the electric arc between the moving contact and the static contact is better and rapidly extinguished, thus the short circuit caused by sudden reversing of current is solved, and the breaking capacity is further improved. Hydrogen or a hydrogen mixed gas can be inflated into the non-polar hydrogen mixed gas DC arc extinction system for realizing arc extinguishing.

The invention discloses a convertor station containing a resistance type superconducting current limiter and a direct current circuit breaker, and a direct current fault processing strategy thereof. According to the technical scheme, a high-resistance characteristic of a superconducting current limiter after failure is utilized, breaking capacity of the direct current circuit breaker under prior art conditions can be fully exerted, and requirements for breaking current of the direct current circuit breaker in a multi-terminal flexible direct-current power grid are reduced. Meanwhile, a problemthat recovery speed of the resistance type superconducting current limiter is too low is solved by using a direct current fault restart protection module and a superconducting current limiter bypassprotection module, so that quick restart of a system after direct current faults becomes possible. In addition, a set of complete direct-current fault processing and restarting recovery strategy are provided aimed at the converter station containing the resistance type superconducting current limiter and the direct current circuit breaker.

A device (1) to protect electrical equipment against transient overvoltages, comprising (i) a spark gap having an intrinsic follow current interrupting capacity and (ii) an element (5) for improving the follow current interrupting power, which co-operates with the spark gap (2) such that the resulting follow current interrupting capacity of the protective device (1) is essentially greater than the aforementioned intrinsic capacity. When the equipment has a suspected short-circuit current that exceeds the intrinsic interrupting capacity of the spark gap (2), element (5) comprises a means (6) for limiting the intensity of the electric current that can pass through the spark gap (2), said limiting means (6) being specifically designed and mounted in relation to the spark gap (2) in order to limit the intensity of the follow current, such that the follow current can be interrupted thanks to the intrinsic follow current interrupting capacity of the spark gap (2).

The utility model relates to a contact system of an electrical appliance with an automatic shift switch, which consists of a shell, a moving contact component, a static contact component and an interrupter. A side of the shell is sunken and forms a setting hole with a moving contact component and a component setting hole with a static contact; the two ends of the moving contact component form the moving contact with a finger-shaped assembling type and the static contact with a knife-shaped plug-type; the static contact component consists of two finger-shaped assembling type static contacts and two static contacts with knife-shaped plug-type; the interrupter is arranged between two static contacts with finger-shaped assembling type and the moving contact with finger-shaped assembling type. The invention provides the contact system of automatic switch electrical appliance which integrates the traditional finger-shaped assembling type contact with knife-shaped plug-type contact together. The invention uses the integration of the finger-shaped assembling type contact and the interrupter to reach a higher requirement of connecting capacity and breaking capacity. Besides, the invention can use a mutual compensation of the repulsion force of the crunode of the finger-shaped assembling type contact and the electrical suction of the crunode of the knife-shaped plug-type contact, so as to improve the short circuit resistance capacity of the switch electrical appliance.

The invention relates to a small circuit breaker with protection of electric leakage, overload and short circuit. The small circuit breaker mainly solves the problem that the existing double-wire small circuit breaker has poor tripping flexibility when in electric leakage and is characterized in that the coil frame (14) is arranged on the position of a lower shell (3) corresponding to a trip (9);a locking fastener (8) is provided with a baffle plate (20) corresponding to an inner top needle (18) of the coil frame (14); and a rotating shaft (28) of the trip (9) is arranged between the coil frame (14) and an upper shell (1). The small circuit breaker with protection of electric leakage, overload and short circuit improves the sensitivity of leakage tripping under the condition without changing the appearance structure and size of the shell of the original small circuit breaker. In addition, the small circuit breaker changes the shape of an arc extinguish chamber, improves arc extinguishperformance, further improves breaking capability of the circuit breaker, and is characterized by compact structure, high sensitivity of leakage tripping and high breaking capability.

The invention relates to a gravity type hydraulic breaking hammer which comprises a hammer outer shell, a hydraulic cylinder, a guide rail, a drill rod base, a drill rod, an impacting piston, a vibration reduction device, a connecting piece and a steel wire rope. The hydraulic cylinder, the guide rail, the vibration reduction device and the connecting piece are all connected with the hammer outer shell through screws. The drill rod base is connected with the vibration reduction device through screws. The drill rod is clamped on the drill rod base through two drill rod pins. The impacting piston is located in a rail of the hammer outer shell and vertically slides along the rail during working. The gravity type hydraulic breaking hammer further comprises a transmission mechanism formed by a movable pulley set, a top end pulley and a tensioning pulley. Compared with the prior art, the gravity type hydraulic breaking hammer is simple in structure, convenient to operate, high in breaking capacity, high in production efficiency, low in use and maintenance cost and low in noise pollution, the production efficiency of related industries can be greatly improved, the production cost can be reduced, the economic benefits of enterprises can be accordingly increased, and the gravity type hydraulic breaking hammer has the good application and popularization values.

A method of operating a wind turbine plant is provided. Such a wind turbine plant comprises at least one transmission branch comprising a plurality of wind turbine generators and coupled to an electrical grid at a point of common coupling through at least one circuit breaker comprising a breaking capacity. The method comprises monitoring the electrical grid for a low voltage fault event; and if a low voltage fault event is detected: calculating a grid short circuit strength, determining a short circuit current limit if the grid short circuit strength requires an initial fault current contribution which exceeds the breaking capacity of the circuit breaker to be passed through the circuit breaker, determining a maximum fault current contribution based on the short circuit current limit and operating the wind turbine generators to provide to the electrical grid the maximum fault current contribution.

The invention provides a miniature circuit breaker current limiter. An electric repulsion mechanism of the miniature circuit breaker current limiter comprises a static contact and a moving contact which have opposite current direction, are parallel to each other and contact mutually. The separation and reunion of the static contact and the moving contact are controlled by an operating system comprising a toggle type connection rod lock catch of an energy storage device, the moving contact is electrically connected with the current coil of a hydraulic electromagnetic release, the operating system and the hydraulic electromagnetic release share the toggle type connection rod lock catch, and the hydraulic electromagnetic release pushes the toggle type connection rod lock catch to unlock to make the circuit breaker break. Preferentially, the static contact is provided with a magnetic iron sheet and an arc guide plate; the moving contact is provided with an arc angle, the toggle type connection rod lock catch comprises a tripper, a lock catch, a connection plate, a support piece and a pull rod, or the toggle type connection rod lock catch comprises a connection rod, a toggle, a mandril, a support piece and a pull rod, and the hydraulic electromagnetic release comprises a support, a pole shoe, an armature and an oil damper. The miniature circuit breaker current limiter has the advantages of unique design, simple structure, rapid action, strong circuit breaking capacity, good stability, safety and energy saving, thereby being suitable for large-scale popularization and application.