28 results about "Crowbar" patented technology

A cell (12) for a voltage source converter, comprising: a first cell connection terminal (CCI); a second cell connection terminal (CC2); a first series connection of two switches (T1, T2), a midpoint of the first series connection of the two switches forming the first cell connection terminal (CCI); an energy storage branch (ESB) comprising a capacitor (C C ); and a crowbar branch connected in parallel with the energy storage branch (ESB), the crowbar branch comprising a first switching element (SCB1) adapted to be activated to short-circuit the capacitor (Cc) of the energy storage branch (ESB) based on detection of a short circuit fault, and a resistive element (R D ) connected in series with the first switching element and arranged to improve damping in the crowbar branch.

The utility model discloses an electrode boiler heating system relates to electrode boiler technical field, including crowbar piece one, the one side of crowbar piece one is provided with crowbar piece two and crowbar piece three, and crowbar piece two sets up on the upside of crowbar piece three, and the electrode type hot water boiler is contained in crowbar piece one, and the high pressure equipment is installed in crowbar piece two, and the low pressure equipment is contained in crowbar piece three. Through above-mentioned technical scheme, the electrode type hot water boiler is no longer the heating furnace of separate but a heating system, and the different crowding of setting can make the different equipment install in the different position and be convenient for management, and the electrode heating furnace main part is high -tension wire, and the high -voltage electric equipment is placed in the same place and will be more safe.

The utility model discloses a wrench, include: the body, the one end of body is provided with the spigot, the other end of body is equipped with a link loop, this wrench will the link loop of wrench, the outer facade of filter core is covered, then the body is adjusted to the appropriate position, and the crowbar is worn into the spigot, through the crowbar, can complete the filter core replacement action, and the operation is simple and effective, can simply and effectively solve the problem mentioned in filter core background technology.

A method for operating a multi-stage bridge power converter in an electrical power system includes connecting multiple phases of the power converter to a common terminal on the DC side of the power converter to effectively make the multiple phases equal at a common potential. The method may further include fault monitoring of multiple devices of the power converter via a controller. Upon detecting a fault in one or more of the multiple devices, the method includes activating one or more protective devices of the power converter via the controller to prevent further faults in the remaining devices by diverting energy from the remaining devices.

This utility model belongs to the field of wind power generation technology, specifically a multi-stage collaborative suppression device for high voltage ride-through (HVRT) transient overvoltage in direct-drive permanent magnet wind turbines. It includes a three-stage hardware topology in series: a first-stage crowbar circuit comprising an anti-parallel thyristor module connected in series with a current-limiting inductor, and paralleled between the positive and negative terminals of the DC bus; a second-stage energy-dissipating branch comprising IGBT switching devices driving a chromium-aluminum alloy resistor array mounted on an air-cooled heat dissipation substrate; a third-stage unloading circuit comprising a mechanical contactor controlling a water-cooled resistor box, with a built-in copper water channel within the resistor box, the resistor plates inside the resistor box being tightly fitted to the copper water channel, and heat dissipation through an external circulating water cooling system; and an FPGA controller that compares the DC bus voltage with the third-stage threshold in real time, generates a trigger signal, and adjusts the duty cycle of the second-stage PWM. This device solves the problem of DC bus overvoltage caused by grid faults.

1. The name of the design product: crowbar. 2. The use of the design product: for crowbar. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view. 5. The design points have been embodied in other views, omitting the right view.

This invention presents a crowbar reversal strategy based on rotor fault current and grid voltage. This method is an improved crowbar protection strategy, adding a series protection resistor between the original crowbar circuit and the rotor-side converter. It employs a fast switching criterion based on grid connection point voltage vector drop detection, which can simultaneously limit the current surge flowing through the RSC and the rotor windings. For different fault clearing times, a crowbar reversal strategy based on rotor fault current and grid voltage is designed, which can reduce the crowbar activation time to a certain extent, thereby reducing the absorbed reactive power, and also offers greater flexibility.

The invention discloses a staged grouping method and system for a whole wind power plant fault process and electronic equipment, and the method comprises the steps: carrying out the grouping equivalence of a whole wind power plant group based on a slip ratio and an rsc inner ring proportionality coefficient of a rotor-side converter in an unreacted stage of a converter; when at least one fan action enters a crowbar protection Crowbar input-asynchronous machine stage, performing initial classification on a whole fan group based on whether the fan action exists, and performing grouping equivalence based on a slip ratio and an inner ring proportionality coefficient of a rotor side converter on the basis of an initial classification result; and when the Crowbar exits and all the fans return to the rsc control stage, keeping the grouping result until the fault is removed. According to the method, the wind power plant short-circuit current dynamic characteristics in the whole fault process can be accurately described, accurate calculation of the wind power plant short-circuit current is achieved, and technical support is provided for high-proportion new energy power system short-circuit calculation and wind power plant equivalent grouping.

The utility model provides a mine forcible entry device which comprises a crowbar and a baffle, the front end and the rear end of the crowbar are respectively provided with a prying head, the baffle is fixedly connected with the crowbar, and the axial direction of the crowbar is perpendicular to the surface of the baffle. By the adoption of the technical scheme, when an operator uses a crowbar to lift a heavy object in a mine, due to the fact that the crowbar is fixedly connected with the baffle, when the heavy object is lifted into the air, even if some matter components fall off, the baffle blocks the falling matter components, the situation that the falling matter components injure the body of the operator can be avoided, and the safety of the operator is guaranteed. And in addition, after one end of the crowbar is inserted into the ground, the baffle can also serve as a stable lever fulcrum, so that a heavy object is convenient to lift, and the labor intensity of an operator is reduced.

A crowbar circuit for a voltage transformer, comprising: a triggering device for triggering a short circuit via input terminals depending on control voltage; a comparator configured to trigger the triggering device depending on a comparator voltage at a comparator input and a reference voltage threshold value, a Zener diode with a breakdown voltage in series with a fifth resistor, connected between an input terminal and the comparator input, such that when the input voltage exceeds the breakdown voltage, the comparator voltage triggers the short circuit; a series connection of a seventh resistor, an eighth resistor, the fifth resistor and a sixth resistor, wherein load current at an output flows through the seventh and sixth resistors and wherein the comparator input is connected to a node between the fifth and eighth resistors, and the series connection is connected between the input terminals, such that upon exceeding a predetermined threshold current, the comparator voltage triggers the short-circuit.

A low-power clock buffer circuit is disclosed that reduces crowbar current and improves power efficiency across a wide range of supply voltages. The circuit comprises an input stage with current-limited PMOS and NMOS transistors, and an output inverter stage with split-gate drive. The input stage uses current sources to control the rise and fall times of signals driving the output inverter, creating a delay between the activation of the PMOS and NMOS transistors in the output stage. This delay minimizes the duration when both output transistors are simultaneously conducting, significantly reducing crowbar current. An alternative embodiment includes a current-starved latch in the output stage to mitigate floating node situations and enhance signal integrity. The circuit is suitable for clock distribution networks in large digital systems.

This invention relates to an active crowbar circuit control system and method for variable-speed pumped-storage hydroelectric power generation units, belonging to the field of variable-speed pumped-storage power generation-motor control technology. To improve the unit's low-voltage ride-through capability and enhance grid power quality, the present invention uses an RL filter circuit with a resistor connected to the crowbar-side converter and an inductor connected in parallel between the doubly-fed induction generator (DFIG) and the rotor-side converter. One end of the three-phase current detection module is connected to the CSC controller, and the other end is connected to the inductor. One end of the drive circuit is connected to the CSC controller, and the other end is connected to the crowbar-side converter. One end of the DC voltage detection module is connected to the CSC controller, and the other end is connected to a capacitor. One end of the three-phase voltage detection module is connected to the CSC controller, and the other end is connected to the three-phase power grid. This invention improves the unit's low-voltage ride-through capability.

A system and method for autonomous machine identity succession utilize a hardware-rooted semantic sentinel and an analog neuromorphic audit engine to ensure state integrity. The system detects micro-architectural threat signatures through continuous asynchronous voltage monitoring and gates cryptographic signatures via a low-impedance analog interlock circuit physically interposed on a processor signature-enable line. Behavioral integrity is verified through an adversarial “Proof of Logical Alignment” handshake, where proposed action vectors are audited via an analog memristor crossbar array utilizing physical current summation replicated through a high-impedance Wilson Current Mirror isolation barrier. The invention ensures the atomic migration of identities across heterogeneous hardware architectures through a “Handshake-and-Zeroize” protocol, utilizing a series-pass isolation switch and crowbar MOSFET circuit to provide irreversible thermodynamic destruction of the source state.

The utility model relates to the technical field of inspection testers, in particular to a car coupler supporting seat clamping stagnation inspection tester which comprises a shell, an extending structure is arranged at one end of the shell, a notch is formed in the lower side of the interior of the shell, an adjustable fixing structure is arranged in the notch and comprises a connecting shaft, a connecting block is arranged on the outer side of the connecting shaft, and a limiting groove is formed in the lower portion of the connecting block. A threaded hole is formed in one side of the shell, a threaded fastening rod is rotationally connected into the threaded hole in a threaded mode, one end of the threaded fastening rod abuts against one side of the connecting block, a distance detection port is formed in the lower side of the extending structure, an indicator lamp is embedded in one end of the shell, and a charging port is formed in one end of the shell. A button is arranged on the upper side of the shell, and a proximity switch is arranged on one side of the The utility model solves the problems that the existing inspection mode generally adopts a jack method and needs to disassemble the car coupler, so that the workload is large; the hook head is manually pressed by a crowbar, two persons need to cooperate to check the downward moving distance to confirm clamping stagnation, and manpower is consumed.

The application discloses a calculation method of short-circuit current of a new energy double-fed unit during low-voltage penetration, and is specifically implemented according to the following steps: a short-circuit current simplified model is established; an RT-LAB semi-physical simulation platform is used to build a new energy double-fed unit grid-connected system, and short-circuit currents of the unit under different fault scenes are obtained; simulation test is carried out; a least square method is used for data fitting of the short-circuit current during the low-voltage penetration stage, key parameters of the short-circuit current model are obtained, thereby forming calculation models of the short-circuit current during the Crowbar input stage and the RSC reactive power control stage, and finally forming a practical short-circuit current calculation model of the new energy double-fed unit. The calculation model is clear, has strong universality and operability, through the RT-LAB semi-physical simulation combined with the control characteristics of the actual new energy unit converter, the actual operation condition of the field is more approached, the calculation amount is reduced, the time required for calculation is shortened, and the calculation efficiency is improved.

The invention relates to an active unloading type modular multilevel converter with a direct current fault blocking capability, which comprises a first unit, a second unit, a direct current switch and a third unit, component parameters and trigger time sequences of the first unit, the second unit and the third unit are subjected to group setting according to a target residual voltage ratio, allowable impact current and expected decay time; according to the converter, a staged control process of bypass-locking-cutoff-cooperative energy consumption is adopted, and distributed capacitor unloading is achieved. Compared with the prior art, the method has the advantages that the capacitor of each sub-module can quickly and uniformly release energy, overvoltage, breakdown and damage risks caused by long-time charging of the capacitor are avoided, the safety and reliability of the system are remarkably improved, the stress of the device is reduced, and the economical efficiency of the system and the engineering implementability are both considered.

The utility model discloses a multi-group ignition device, which relates to the technical field of oil and gas exploitation equipment and comprises a master control pry, a separator ignition control pry, a main ignition control pry and an ignition gas source storage tank, the separator ignition control pry is in control connection with at least one ignition gun used for igniting gas exhausted by the separator. The main ignition control pry is in control connection with at least one ignition gun used for igniting gas exhausted by the blowout pipeline, and each ignition gun is connected with an ignition gas source storage tank through a gas pipe, so that the problems that during oil and gas exploitation in the prior art, an ignition device used at the blowout pipeline and a separator ignition device are independently arranged and controlled, the related pipelines are more, and the production cost is low are solved. In the installation process, the workload of operators is large, and disassembly and assembly are inconvenient.

The utility model relates to the technical field of demolding devices, and discloses a demolding device for prepreg compression molding, which comprises a bottom plate and a top plate, a lower mold is slidably connected in the bottom plate, and driving components for providing power are fixedly connected to the front and rear sides of the inner wall of the bottom plate. Rotating plates are rotatably connected to the left and right ends of the driving assemblies, two concave plates are rotatably connected to the close ends of the multiple rotating plates, guide plates are fixedly connected to the top sides of the concave plates, clamping plates are fixedly connected to the top sides of the guide plates, and transmission plates are rotatably connected to the interiors of the close ends of the two driving assemblies; the close ends of the two transmission plates are rotationally connected with a sliding plate. According to the utility model, the transmission plate is pushed to slide upwards, then the ejection plate is pushed to slide upwards, and a molded product is ejected out of the lower die through the ejection plate, so that the molded product does not need to be pried out by a crowbar, the scratch is avoided, and the yield is further improved.

1. The name of the design product: crowbar (multifunctional adjustable). 2. The use of the design product: multifunctional adjustable crowbar. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.

The invention discloses a generator bar dismantling auxiliary method. At present, the stator bar of a large-scale generator set is mostly disassembled by finding a supporting point on site, prizing the upper end and the lower end of the bar by using a crowbar, and pulling out the bar. The method comprises the following steps that the device is lifted and placed in a generator chamber, then one person holds an operation shaft in an operation box by hand, the operation shaft rotates, a worm sleeve on the operation shaft is meshed with a worm gear, rotating rod frames of the operation shaft rotate, the two rotating rod frames synchronously and reversely rotate, and the position of a cushion frame can be adjusted; adjusting to enable the cushion frame to abut against the stator iron core, and enabling the tail transverse cushion plate to abut against the stator iron core at a position opposite to a generator chamber; after installation is completed, the winding bar is bound through the binding band, then the winding bar can be pulled out by pulling the binding band through the hook of the chain block, the efficiency of disassembling the winding bar is improved, and meanwhile the generator stator iron core is prevented from being damaged. The device is used for dismounting the generator winding bar.

1. Name of the product in this design: Crowbar. 2. Purpose of this design: This product is used for prying and dismantling objects. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

An electrical protective device for an electrical circuit is configured to mitigate leakage current by directing leakage current away from a load connected to the electrical circuit, when the device enters a standby operating mode wherein the device operates at a reduced capacity. The device comprises at least one of a shunt switch, a crowbar circuit, and a common mode voltage protection system. The shunt switch provides a low resistance path for directing leakage current from a positive leg of the circuit connected to a line side of the device away from the load, and into a negative leg of the circuit connected to the line side. The crowbar circuit is used in addition to the shunt switch to mitigate fault conditions that could damage the shunt switch. The common mode voltage protection system is configured to provide a low resistance path for maintaining the load voltage near ground potential.

The invention discloses a calculation method and system for a crowbar action boundary of a doubly-fed wind generator. The calculation method comprises the following steps: establishing a short-circuit current response expression of a doubly-fed wind generator set under continuous excitation control of a rotor; based on the short-circuit current response expression of the doubly-fed wind turbine generator, a rotor current dynamic analytic solution under the synchronous rotating coordinate system is obtained through simultaneous establishment of a flux linkage equation, a voltage equation and a current loop control equation; according to a rotor current dynamic analytic solution in a synchronous rotating coordinate system, determining a quantitative relation between a transient component attenuation coefficient and a current inner loop control parameter; based on the quantitative relation between the transient component attenuation coefficient and the current inner loop control parameter, obtaining a relational expression of a crowbar action boundary about the voltage drop degree and the slip rate; and if the crowbar action of the doubly-fed wind turbine generator is located above the crowbar action boundary, crowbar action is performed after the fault. The problems that in the doubly-fed wind power plant low-voltage ride-through process, the crowbar protection action boundary is not clear, and the accuracy of a field group grouping equivalent model is insufficient are solved.

The application discloses an operating mechanism of a vacuum arc-extinguishing circuit breaker, which comprises a shell, a vacuum arc-extinguishing chamber and a guide rod, a T-shaped circular groove is arranged in the guide rod, a T-shaped circular rod is slidably connected in the T-shaped circular groove of the guide rod, a crowbar is hingedly connected to the lower end of the T-shaped circular rod through a hinge shaft, a hinge seat is arranged at the lower end of the shell, the middle end of the crowbar is hingedly connected in the hinge seat, a circular boss of the shell is provided with a pneumatic cylinder on the outer surface through bolts, a pushing fork is fixed to the end face of the pushing rod at the lower end of the pneumatic cylinder, and the rear end of the crowbar is hingedly connected in the pushing fork. The crowbar can be directly controlled to be turned up and down by the pneumatic cylinder, so that the guide rod can be directly controlled to move upwards to be combined or to move downwards to be separated, the control is facilitated, the structure is simple, and the cost is low.

The invention relates to the technical field of wind power grid-connected operation and control, and discloses a rotor overcurrent suppression method and system of a doubly-fed induction generator. The method comprises the following steps: obtaining a rotor current of a doubly-fed induction generator DFIG; separating the rotor current into a fundamental frequency direct current component and an alternating current free component; inputting the fundamental frequency direct current component into a proportional integral (PI) controller, and performing decoupling control of active power and reactive power; inputting the alternating current free component to a vector proportional integral (VPI) controller when detecting that the voltage of the power grid drops, so as to suppress the alternating current free component; and superposing the output of the PI controller and the output of the VPI controller to generate a control signal of a rotor-side converter RSC, and driving the rotor-side converter to realize the suppression of the rotor overcurrent. According to the application, additional hardware devices such as a Crowbar circuit do not need to be added, and the system cost is reduced.

The invention discloses a low-voltage ride-through control method for a wind turbine generator, relates to the technical field of wind power generation, and solves the problem that for a mainstream doubly-fed induction wind turbine generator, huge transient overcurrent can be induced on the rotor side of the mainstream doubly-fed induction wind turbine generator by power grid voltage drop, and the safety of a converter on the rotor side is threatened. According to the technical scheme, a hybrid energy storage system composed of a super capacitor and a storage battery is connected to a direct-current bus of a wind turbine generator converter in parallel, and an intelligent cooperative control mechanism linked with the hybrid energy storage system is designed. The method comprises the steps of generating a total power absorption instruction of the hybrid energy storage system according to a deviation and a change rate of a direct-current bus voltage when detecting that a power grid voltage drops; the method has the advantages that it can be ensured that the grid-side converter continuously provides reactive power support for the power grid during the fault period, the defect that a traditional crowbar circuit absorbs reactive power is fundamentally overcome, meanwhile, rapidness, smoothness and high reliability of the low-voltage ride-through process are achieved, and the grid connection performance of a wind turbine generator is remarkably improved.

The application discloses a comprehensive control mode flexible connection switching method applied to a DFIG, and the method comprises the following steps: using a current limiting module to ensure that the current limiting performance of each implementation stage of a control strategy can be maximized; introducing a resistance-capacitance crowbar to realize the switching impact limitation of the control mode, and designing an input and cut-off reference mechanism matched with the control switching of the application, so that the key problems encountered in the use of the crowbar are effectively solved; and integrating a state follow-up module into the converter control architecture of the DFIG to ensure the synchronization of parameters in the control mode switching process, so that the system can be effectively prevented from suffering from a major switching impact, and the smooth transition of the control mode is realized. During the state follow-up, the network configuration control strategy adopted by the RSC of the DFIG provides a reactive power compensation reference for the improvement of the GSC, so that a close internal relationship between different control modes is established in the switching process, instead of a simple time sequence splicing.

The invention relates to the field of phased array systems, and discloses a test fixture for a multi-channel radio frequency transceiver component, which comprises an upper mounting plate, a lower mounting plate, an unloading mechanism and a driving mechanism, and is characterized in that the upper mounting plate is connected to an equipment table in a manner of moving up and down; the lower mounting plate is connected to the equipment table; the driving mechanism is connected to the upper mounting plate; the unloading mechanism is mounted on the equipment table, the driving mechanism drives the upper mounting plate to ascend, and the unloading mechanism jacks the tested product to be separated from the lower mounting plate. The device has the beneficial effects that the unloading mechanism and the main driving mechanism are arranged in a linkage mode, the jacking action is automatically driven while the upper mounting plate ascends, huge accumulated insertion and extraction force and the vacuum adsorption effect are directly overcome through stable and vertical mechanical jacking force, the connector is separated from the lower connecting plate, and the connector is prevented from being damaged. The damage to the contact pin of the connector and the scratch to the appearance of the product caused by barbaric operation such as using a crow bar are fundamentally avoided.