35 results about "Circuit breaker" patented technology

A closing phase that produces the smallest energization flux error at a connection input point is calculated based upon a residual flux of the first closing phase and the preliminarily given pre-arc characteristic and closing time deviation characteristic of a three-phase circuit breaker, so that the calculated phase value is set as a target closing phase of the first closing phase. A closing phase that produces the smallest energization flux error when a residual flux of zero is calculated, so that the calculated phase value is set as a target closing phase of the remaining two phases. The total time required from the reference point to the target closing phases of the remaining two phases and a delay time corresponding to an integer multiple of a given cycle of the three-phase power supply is set as a target closing time of the remaining two phases.

A control apparatus of an automatic machine is provided, while the control apparatus supplies electric power of a power supply in high reliability with respect to a driving apparatus of the automatic machine, and further, has no problem as to ensuring of safety.

In a control apparatus of an automatic machine having a breaker (22) connected to a power supply (21), and a driving apparatus (32) for supplying electric power of the power supply (21) to a driving unit (35) of the automatic machine via a relay apparatus (31) connected to the breaker (21), which controls the driving apparatus (32), the control apparatus is comprised of: a current control rectifying element (33) connected to the relay apparatus (31); and a current controlling device (29) for feed-controlling the current control rectifying element (33) after a contact of the relay apparatus (31) has been closed when supplying of the electric power to the driving unit (35) is turned ON.

The movable conductors of a three phase isolation switch are incorporated into the electrically insulative molded shaft, thereby mechanically supporting them and isolating them from the metal axle of the shaft. Movable contacts on the ends of each movable conductor are angularly spaced by α degrees, where α is less than 180° and is 90° in the exemplary embodiment. A common fixed load contact is located angularly between, and spaced α degrees from, both the fixed line and ground contacts so that the shaft is rotated only α degrees between a first, closed position, in which the movable conductors connect the fixed load contact for each phase to the corresponding fixed line contact, and a second, grounded position, where the fixed load contact of each phase is connected by the movable conductor to the corresponding fixed ground contact.

According to one embodiment, a digital protection relay includes an auxiliary transformer (2) which decreases a voltage of an electrical signal from a main circuit transformer (1) to a predetermined voltage; a detection resistance circuit (20) including a Π-type or T-type circuit including an input connected to an output of the auxiliary transformer (2); an analog detection circuit (3) which is connected to an output of the detection resistance circuit (20) and detects a quantity of electricity of an electrical signal from the auxiliary transformer (2); an A/D conversion circuit (4) connected to the analog detection circuit (3); a central processing device 5 which is connected to the A/D conversion circuit (5) and performs a protection operation; and a trip output contact (9) which is closed by processing of the central processing device (5) and operates an external breaker (21). In the digital protection relay, an input contact terminal 11 for inputting a test signal with a constant voltage from an external test device (13) to the analog detection circuit (3) as a signal corresponding to an output of the auxiliary transformer (2) is provided between the detection resistance circuit (20) and the analog detection circuit (3).

The invention discloses a distributed backup automatic switch device connecting method and a backup automatic switch action method of a distributed backup automatic switch device, and relates to the distributed backup automatic switch device, in particular to a distributed backup automatic switch device used for a power grid. Great technical guarantee is provided for large-range application that a distributed power supply system is connected into a large power grid. The connecting method comprises the steps that 1) a reaction distributed power supply breaker position is connected in parallel into the backup automatic switch device, the breaker position is placed at a normally-closed contact of the backup automatic switch device; 2) one of two pairs of normally-closed contacts which can reflect the real-time electricity generating state of a distributed power supply in each circuit is connected in series into a circuit breaker position judging loop in the backup automatic switch device, and the other pair of normally-closed contacts are connected in series into a corresponding continuous cutting tripping circuit in the backup automatic switch device. A distributed power supply circuit can be ceaselessly connected into a power system in real time accurately and intelligently without manual intervention. Accordingly, the operating cost of a power enterprise can be saved, and the risk of safe stable operation of the power grid can be lowered.

The invention discloses an automatic reclosing circuit breaker, which comprises a circuit breaker body and an automatic reclosing drive mechanism; a transmission turbine is provided with a cam linkage part, a turbine follower part, a gear driving part and a dial part; There is a toggle boss on the top; a circular through hole, a first three-leaf switch and a second three-leaf switch are arranged on the circuit board; the first three-leaf switch is provided with a first stationary blade, a first moving blade and a second static blade Blades, the first moving blade can be moved to be crimped on the first stationary blade or the second stationary blade; the second three-blade switch is provided with the third stationary blade, the second moving blade and the fourth The blades can be moved and pressed against the third stationary blade or the fourth stationary blade; the first stationary blade, the first moving blade, the second stationary blade, the third stationary blade, the second moving blade and the fourth stationary blade along the The clockwise direction is arranged around the circular through hole in turn. The invention can simplify electric control and improve reliability.

The support for the moving contact of a circuit breaker has a piston that is driven by arc gases generated by initial separation of the contacts through magnetic repulsion to rapidly open the contacts. A pair of telescoping shield sleeves that have aligned openings through which the moving contact is extended to close with the fixed contact are oppositely driven transversely to piston movement by the arc gases to cut off the arc.

The invention discloses an intelligent oil-immersed transformer comprising a box body filled with transformer insulating oil and a transformer installed in the box body. A transducer module and a protector are also installed in the box body, wherein the protector comprises a vacuum arc extinguish chamber, a control mechanism of the chamber and a control module; one end of the control mechanism is connected with a high-pressure bushing seat, and the other end thereof is connected with a movable contact of the vacuum arc extinguish chamber; a stationary contact of the vacuum arc extinguish chamber is connected with the high voltage line incoming end of the transformer; the control module is connected with the control mechanism and the transducer module respectively so as to perform circuit operation and transformation on the transformer operation electricity parameter data collected by the transducer module to transmit the data to a far end control center of a mass distribution network; meanwhile, the control module gives out a cut-off instruction to the control mechanism when circuit fails. The invention does not need additional breaker cabinet bodies, thus obviously reducing the installation space of the transformer and mating devices, and can greatly reduce installation and construction links and workload of the transformer, thus causing the transformer to be installed conveniently and quickly.

The invention relates to the technical field of multi-mechanical devices, in particular to a safe discharge nuclear capacity structure. The discharge nuclear capacity structure comprises a main control room, a wiring board, a storage battery pack and a discharge instrument; the main control room is electrically connected with the wiring board; the wiring board is both electrically connected with the storage battery pack and the discharge instrument; a controllable switch and a plurality of first circuit breakers are arranged between the main control room and the wiring board; the wiring boardand the storage battery pack are provided with second circuit breakers; and the storage battery pack is electrically connected with the discharge instrument through a detachable power-on structure. According to the safe discharge nuclear capacity structure, the wiring board with an operation link is not electrified when the discharge instrument is dismounted during nuclear capacity discharge, so that the possibility that the positive electrodes and the negative electrodes of storage batteries are connected to form a short circuit is avoided, safety accidents are reduced, and the personal safety of maintenance personnel and the equipment safety are ensured.

The invention relates to the technical field of circuit breaker test equipment, in particular to a device for testing a circuit breaker of a rotary knob type for protecting a motor. The device comprises a control unit, a frame and a test unit. The control unit is used for automatic control of a test process, and the test unit comprises a large-current test part and a switching-on and switching-offoperation part. The large-current test part comprises a tray, a clamping mechanism and a large-current terminal assembly, and is used for placing a circuit breaker, locating and clamping the circuitbreaker, and transmitting a plurality of currents with various values to the circuit breaker in the test process. The switching-on and switching-off operation part comprises a lifting platform and anoperation clamping tool device, and is used for rotating a rotary knob shaft of the circuit breaker in the large-current test process to switch the circuit breaker. The device can realize the automatic test of the circuit breaker of the rotary knob type for protecting the motor, reduces the interference of human factors, and has the advantages of high detection precision, high safety and high efficiency.

The invention discloses a discriminating system and method for automatic putting and retreating of startup-shutdown protection of a generator. The discriminating system is composed of a generator outlet voltage transformer (2), a main transformer (3), a grid-connected circuit breaker (4), a bus (5), a system-side circuit breaker (6), an enclosed bus (8), a first group of overhead lines (9), a second group of overhead lines (10), a third group of overhead lines (11) and a fourth group of overhead lines (12). With the discriminating system and method disclosed by the invention, a problem that the states of the generator set and the grid system are determined inaccurately only based on the state of the grid-connected circuit breaker. The states of the generator set and the grid system are determined by using the generator-end voltage frequency sum and the grid-connected circuit breaker as criteria simultaneously to realized automatic putting of startup-shutdown protection. The discriminating system and method have advantages of accurate identification, high adaptability and high reliability.

The invention discloses an anti-tripping circuit of a circuit breaker, the anti-tripping circuit comprises a manual closing branch circuit, a remote closing branch circuit, an anti-tripping branch circuit and an anti-tripping control branch circuit, and the manual closing branch circuit is used for manually operating the circuit breaker to be closed; the remote closing branch is used for remotelycontrolling and operating the circuit breaker to be closed; the anti-tripping branch circuit is used for cutting off the manual closing branch circuit and the remote closing branch circuit; and the anti-tripping control branch is used for controlling whether the anti-tripping branch acts or not. According to the anti-tripping circuit of a circuit breaker, when switching-on operation is carried out, if switching-on is just carried out on a fault line or equipment and faults such as adhesion and the like happen to a manual switching-on contact or a remote switching-on contact of a switching-on control loop at the same time, the tripping fault of the circuit breaker can be prevented through the tripping prevention control circuit of the circuit breaker, the tripping prevention purpose of thecircuit breaker is achieved, and normal operation and reliable switching-on of the circuit breaker are ensured.

The invention relates to a one-in two-out double-sided operation low-voltage molded case circuit breaker. The circuit breaker comprises a first circuit breaker mechanism, a second circuit breaker mechanism and a fixed base. The first circuit breaker mechanism and the second circuit breaker mechanism are arranged on the front side and the rear side of the fixed base respectively. The circuit breaker mechanism comprises a switch and a shell. The switch is arranged in the middle of the shell. The upper side of the shell is connected with four wire inlet binding posts in a screwed mode. The lowerside of the shell is connected with four wire outlet binding posts in a screwed mode. Four wire inlet holes are formed in the top of the shell, and the positions of the four wire inlet holes correspond to the positions of the four wire inlet binding posts. According to the invention, device disconnection caused by electric arcs in the later operation process can be avoided, so that two circuit breakers with the same model, the same shape and capacity and the same disconnection capability are combined into one. The installation space of the circuit breaker is reduced, and resources are saved.

The invention belongs to the technical field of a distribution box used for power transmission, and particularly relates to a theftproof distribution box which can be arranged on a mounting surface and has strong functionality. The distribution box comprises a box body, a box cover directly connected with the box body, a bracket arranged in the box body, and a circuit breaker mounting guide rail and a function module mounting guide rail which are arranged in the box body and lean on the bracket, wherein a mounting opening is arranged in the bottom of the box body; the box cover and the box body are connected through two pressure expansion links; the circuit breaker mounting guide rail and the function module mounting guide rail are parallelly arranged; the bracket and the box body are detachably connected; and mounting opening is concavely arranged towards the inner part of the box body. The distribution box disclosed by the invention has the beneficial effects that the box body and the box cover are in an integrated structure, the distribution box is convenient to open and close, the box cover is theftproof and is not lost easily, the function module mounting guide rail that is a mechanism suitable for function expansion is arranged in the distribution box, which helps the same distribution box to realize different functions, the structure is simple, the application capability is strong, and the mounting opening is arranged in the bottom of the box, so that the distribution box is easy to install and the space can be utilized to the maximum degree.

A current transformer according to the present invention may comprise a magnetic core, a secondary coil, and a magnetic flux compensation member. A main circuit of an air circuit breaker penetrates the magnetic core. In addition, the secondary coil is arranged to be adjacent to the magnetic core, and a secondary current is induced through a current flowing in the main circuit. In addition, the secondary coil supplies the induced secondary current to a relay. The magnetic flux compensation member may be coupled to the magnetic core so as to correct magnetic flux of the secondary coil.

The invention discloses a power-off protection test table which comprises a shell, a workpiece mounting seat and a circuit breaker, wherein the workpiece mounting seat is arranged on the shell; the workpiece mounting seat is communicated with a power supply; and the circuit breaker is connected with the shell and connected between the workpiece mounting seat and the power supply. The power-off protection test table has the advantages that the circuit breaker is added in a circuit, when power leaks to the shell of the test table, the circuit breaker cuts off power supplied by the power supply, so that influence of continuous power leakage to the test table on a product in test is prevented.

The circuit breaker (100) includes: a switching mechanism portion that switches the circuit; a casing (1) that houses the switching mechanism portion; an operating handle (2), wherein at least a partof the operating handle protrudes from an opening of the casing (1) so as to allow the switching mechanism to switching the circuit; and an extension handle (3) rotatably mounted to the operating handle (2), wherein an operating position of the operating handle (2) can be moved through rotating, and the extension handle is engaged with the casing (1) to limit the operating handle to switch betweenlimitation positions of movement.

The invention discloses a wire break safety device for a hosiery machine, the structure of which includes a groove, a sensor screw hole, a sensor, a connecting line, a No. There are grooves and sensor screw holes on the sensor. The groove is semicircular and located below the sensor. There are 4 sensor screw holes, which are respectively located on the left and right sides above the sensor and on the left and right above the groove. On both sides, the sensor has an interference fit with the No. 1 connection port through the connection line. The circuit breaker is equipped with the No. 1 connection port, the circuit breaker screw hole, the switch, the No. 2 connection port, the chassis, the base, the No. 1 connection port, and the No. 2 connection port. The outlets are respectively arranged on the left and right sides of the circuit breaker. The beneficial effect of the present invention is that by providing the circuit breaker, the switch will automatically close and disconnect the power supply when the line is broken. Parts, cost saving, easy to use.

The invention belongs to the technical field of high-voltage switch cabinets, and particularly relates to a circuit breaker of a high-voltage switch cabinet, which comprises a circuit breaker body, an insulating sleeve, an insulating baffle door, a push plate, a connecting rod and a telescopic rod, the insulation sleeve and the insulation blocking door wrap and seal a contact of the circuit breaker body, flying sand and dust in air are blocked outside, a push plate makes contact with the inner wall of a high-voltage switch cabinet, a connecting rod is pushed to rotate, the insulation blocking door is driven to slide towards the two sides, an opening of the insulation sleeve is opened, the insulation sleeve makes contact with the inner wall of the circuit breaker body, and the insulation sleeve shrinks. The contact of the circuit breaker body is exposed, so that the contact of the circuit breaker body is prevented from being stained by flying sand and dust, the probability of poor contact of the contact of the circuit breaker is reduced, and the service life of the circuit breaker is prolonged.

The invention relates to an electric operating mechanism of a molded case circuit breaker, which comprises a mechanism frame, a shell and an electric operating assembly, and is characterized in that the electric operating assembly comprises a motor arranged on the mechanism frame, a gear set in linkage fit with an output shaft of the motor, and a rocker arm set which is in linkage fit with the gear set and used for driving a circuit breaker handle to execute opening or closing, the rocker arm set comprises two driving shafts which are rotationally arranged on two side plates of the mechanism frame respectively and are in linkage fit with the gear set, two rocker arms in linkage fit with the two driving shafts respectively, a driving rod arranged between the two rocker arms, and a shiftingframe which is arranged between the two side plates in a sliding manner and is used for driving the circuit breaker handle to execute opening or closing, two crank arms are respectively arranged between the driving rod and the shifting frame, and the two crank arms act along with the driving rod and can drive the shifting frame to slide between the two side plates in a reciprocating manner. The electric operating mechanism has the advantages of simple structure, stable and reliable performance, safety, reliability, small volume, low cost and long service life.

The invention provides a molded case circuit breaker. The problems that a traditional operation molded case circuit breaker mode is direct pressing or pressing on micro-switches through a thin film pad, the operation can not be conducted or the using effect is bad if the structure is used on an upper cover in a complex shape are mainly solved. The molded case circuit breaker is characterized by further comprising a button component, the button component comprises an installation rack (91) and buttons (92), the installation rack (91) is detachably connected with the inner wall of an upper cover (1), one end of each button (92) is attached to a corresponding micro-switch (81), and the other end of each button (92) penetrates through a corresponding limiting hole (11) to be exposed outside. According to the molded case circuit breaker, the button component is further arranged between the upper cover and a circuit board, the button component comprises the installation rack and the buttons, the installation rack is connected with the inner wall of the upper cover, the buttons penetrate through limiting holes in the upper cover to be pressed on the micro-switches on the circuit board, the button component can be suitable for upper covers in various complex shapes of the molded case circuit breaker, the structure is compact, and the application effect is good.