13results about How to "Fast action" patented technology

The present invention provides a protection method for a new energy line with a high proportion of polarity differences of the first four voltage traveling waves. The method first derives the expression of the refraction-reflection coefficient of the wave impedance discontinuity point and obtains its value range. Then, according to the refraction-reflection process of the traveling wave when faults occur at different positions, the expression of the line mode voltage traveling wave at the protection installation is derived. The polarity characteristics of the first four voltage traveling waves when faults occur at different positions can be obtained by using the value range of the refraction-reflection coefficient, and it is concluded that the polarities of the first four voltage traveling waves are the same when there is a fault outside the zone, and the polarities of the first four voltage traveling waves are different when there is a fault inside the zone, and fault identification is performed based on this. The method uses the polarity characteristics of the traveling wave for fault identification. Compared with time characteristics and amplitude characteristics, polarity characteristics are easier to identify and have higher reliability, small calculation amount, and wide application range. At the same time, this scheme is a single-ended quantity protection, which has the advantages of no need for communication and fast action speed, and can reliably identify faults.

The application discloses a novel full-line fast distance protection method under a power system, which comprises the following steps: S1, continuously monitoring the voltage and current on one side of the line, and starting the protection when detecting that the current mutation variable exceeds a set threshold; S2, establishing an accurate line differential equation based on a pi type equivalent model; S3, constructing the differential equation in the time domain by using the collected voltage and current data, and directly and real-timely solving the equivalent transition resistance of the fault point; S4, establishing a relationship model of the additional measurement impedance and the equivalent transition resistance, accurately compensating the apparent impedance measured by the protection device, and accurately calculating the real distance from the protection installation to the fault point; and S5, comparing the calculated fault distance with a preset protection section, and realizing the fast isolation of the fault; the application has the advantages of weak feed adaptability improvement, strong anti-transition resistance capability, long line anti-maloperation optimization and fast action speed, and can provide effective technical support for the main protection configuration of new energy sending-out lines and high-proportion power electronic power grids.

The application discloses a transformer de-blocking of inrush current implementation method, device, medium and equipment. The method comprises the following steps: calculating the differential current sampling value mutation of the transformer corresponding to the sampling point in the first predetermined time interval; in the case that the differential current sampling value mutation of the two continuous sampling points meets the starting criterion, the time corresponding to the latter sampling point is determined as the first starting time; after the second predetermined time interval from the first starting time, in the case that the differential current sampling value mutation of the two continuous sampling points meets the starting criterion, the time corresponding to the latter sampling point is determined as the second starting time; after the first starting time, whether to send a blocking signal is determined according to the differential current sampling value mutation and the intermittent angle blocking criterion; whether to send a blocking signal is determined according to the differential current sampling value mutation of the two sampling points of the second starting time and the intermittent angle blocking criterion, and whether the transformer is de-blocked from the excitation inrush current is determined.

The application discloses a novel IGBT high-voltage capacitor pre-charging system, and belongs to the technical field, comprising: a DC power supply module for providing a high-voltage input voltage; a high-voltage capacitor module connected in parallel with the DC power supply module for storing electric energy; and two IGBT single-pipe switches (IGBT1 and IGBT2). The application adopts IGBT components as switching elements, and thus has many advantages, the action speed of the IGBT is extremely fast, the switching action can be completed within several us, the pre-charging power-on time is shortened, the IGBT has no mechanical wear, the service life is longer than that of a mechanical relay, and the switching life can reach more than several million times, no electric arc is generated during the switching process of the IGBT, and thus no contact ablation is caused, and thus the arc extinguishing problem does not need to be considered, the IGBT has a small size, is convenient to integrate and layout, and can monitor parameters such as current and temperature in the circuit control design, and thus more accurate control can be realized.

A PPU combined mechanical hand is characterized in that motors of X-axis movement modules, Y-axis movement modules and C-axis movement modules are all installed on a base and transmission connection is realized through light telescopic rods. Its advantages are that X-axis movement modules, Y-axis movement modules and C-axis movement modules are additionally arranged on X-axis guide rails of a PPU driving module, the limitation that a conventional PPU mechanical hand can only move for two-point grabbing is solved, and the PPU mechanical hand can meet automatic picking operation in a larger range; meanwhile, all motors for driving X-Y-C movement modules are installed on a machine base, and transmission connection is realized through light telescopic rods, the moving weight borne by the PPU driving module is greatly reduced, and thus the PPU driving module can move faster and the overall operation speed is improved.

The invention relates to the field of power system protection, and relates to a transient characteristic-based distributed power supply-containing power distribution network islanding protection method, which comprises the following steps of: acquiring distributed power supply grid-connected point data, and determining a voltage setting value of islanding protection and an impedance setting value of islanding protection; determining an island protection setting value; obtaining harmonic impedance of the grid-connected point, and determining a harmonic voltage effective value according to the harmonic impedance; determining a voltage continuity parameter according to the harmonic voltage effective value and the voltage setting value, and determining an impedance continuity parameter according to the harmonic impedance and the impedance setting value of the grid-connected point; determining an island fusion action value; judging whether an island protection condition is met or not based on the island fusion action value and the island protection setting value, if yes, judging that the distributed power supply has an island, and otherwise, collecting data again; according to the method, the island protection criterion based on voltage and impedance is formed by using the weighting coefficient, the operation mode of the power distribution network is comprehensively judged from two aspects, and the probability of operation refusal and misoperation of island protection is effectively reduced.

The invention discloses a direct drive type steam turbine valve control device, and relates to the technical field of steam turbines, the direct drive type steam turbine valve control device comprises a spring cover, a spring seat, a spring, a guide seat, a hydraulic servo-motor, a hydraulic servo-motor nut and a coupler assembly, and a spring cavity is formed between the spring seat and the spring cover; a guide sleeve is arranged in the middle of the spring cover, self-lubricating bearings are fixed in the middle of the spring seat and the guide sleeve, and the two ends of the guide seat are in shaft diameter fit with the self-lubricating bearings respectively; a positioning convex ring is arranged on the guide seat; a spring is arranged in a spring cavity; a threaded section is arranged at the end of a piston rod of the hydraulic servo-motor, the piston rod moves leftwards and extends to the left end of the guide seat, and the threaded section is connected with a valve rod through a coupler assembly. The hydraulic servo-motor nut is arranged at the left end of the guide seat and is in threaded connection with the threaded section. According to the invention, the axial guiding and centering functions of the moving part are realized, the guide seat is lubricated, the friction force of the moving part is greatly reduced, and the device can be widely applied to the control of high-thermal-parameter steam turbine valves in various arrangement forms.

The utility model discloses a high-speed switch nozzle applied to an ink-jet printer, which comprises a nozzle body, an ink quantifying cavity is arranged in the nozzle body, a nozzle is embedded at one end of the nozzle body, and the nozzle is communicated with the ink quantifying cavity; an ink injection connector is arranged at the position, corresponding to the ink quantifying cavity, of the nozzle body in a penetrating mode. A permanent magnet movable valve element is arranged in the ink quantifying cavity in a sliding mode, and a reset spring is arranged on the side, away from the nozzle, of the permanent magnet movable valve element in the ink quantifying cavity. The position, corresponding to the permanent magnet movable valve element, of the outer wall of the spray head body is fixedly sleeved with an electromagnetic coil. According to the utility model, the nozzle and the needle valve are integrally designed, so that ink retained in a channel is effectively reduced, the control response speed of the nozzle is structurally improved, and the permanent magnet is adopted to replace an electromagnet to serve as the movable valve core, so that the structural complexity of the needle valve is reduced, and the volume of the valve body is reduced.

The utility model provides an axial piston type pneumatic actuator. The axial piston type pneumatic actuator comprises a shell; the rotating shaft is rotationally mounted in the shell; the cylinder body is arranged in the working cavity, the cylinder body and the rotating shaft are fixedly connected and can rotate synchronously, a plurality of piston holes are formed in the lower end of the cylinder body, and the piston holes are circumferentially and uniformly distributed around the axis of the rotating shaft; the piston unit is arranged in the piston hole in a sleeved mode and can slide in the axial direction, and the sliding direction of the piston unit is parallel to the rotating axis of the rotating shaft; the guide curved surface is arranged in the working cavity and can be in contact with the end part of the piston unit; the air distribution disc is arranged in the shell and used for supplying air to the piston holes and exhausting air from the piston holes, so that the piston units sequentially move in a reciprocating mode and drive the cylinder body and the rotating shaft to rotate. The axial piston type pneumatic actuator is compact in structure, small in occupied space, suitable for various narrow installation environments, high in axial force transmission efficiency and capable of effectively reducing energy loss.

The application discloses a DC transmission line asynchronous protection method and system based on a voltage short window relay, and comprises the following steps: calculating a voltage differential value of a rectifier side of a DC transmission line; determining a positive rate of change voltage differential value of the rectifier side of the DC transmission line according to the voltage differential value; constructing a first criterion of DC transmission line asynchronous protection according to the positive rate of change voltage differential value and a voltage short window relay setting value; calculating current differential values of the rectifier side and an inverter side of the DC transmission line; constructing a second criterion of DC transmission line asynchronous protection according to the current differential values of the rectifier side and the inverter side and a sudden change asynchronous differential relay setting value; and when the first criterion and the second criterion are simultaneously satisfied, the whole protection is operated. The method can greatly improve the sensitivity of high-resistance fault protection.

This utility model discloses a high-voltage protection device for power input, comprising: a sensor module; the sensor module is used to collect voltage, current and temperature signals of the power supply in real time; this utility model introduces a MOSFET fast cut-off circuit, the MOSFET's operating speed is much higher than that of a mechanical relay, and it quickly cuts off the input power supply when high voltage is detected, protecting the downstream circuit, effectively dealing with transient high voltage impacts and avoiding equipment damage caused by slow response speed; based on the fast cut-off provided by the MOSFET, a varistor is used as an auxiliary protection element to absorb high voltage transient energy, further mitigating the impact of high voltage on downstream equipment. At the same time, varistor one is used to absorb transient high voltage impacts, and varistor two is used for backup protection under continuous high voltage conditions; by integrating a Wi-Fi communication module and an OLED screen, it provides comprehensive real-time monitoring, remote management and fault diagnosis functions, meeting the needs of modern intelligent equipment protection.

The utility model discloses an injection mold of energy absorption device, include: lower mould subassembly, it includes lower mould base, sliding block and pressure lever, the lower mould base has with the installation groove of pulling off the block profile matching, be equipped with the locating post in the installation groove to with the fixed hole limit on pulling off the block, the sliding block swing installation on lower mould base, and the pressure lever is fixed in the sliding block inboard, upper mould subassembly, it includes upper mould base and wedge tight block, when upper mould subassembly and lower mould subassembly close mould, the wedge tight block press down the sliding block and make it move towards inboard, and then drive the pressure lever and resist the mounting panel of tightly. The utility model provides an injection mold of energy absorption device, realizes mounting panel stable clamping through wedge tight block and sliding block cooperation, spares cylinder clamping, simplifies the procedure, promotes the forming speed, and guarantees injection molding pin precision and whole energy absorption device performance through locating post and pulling off the block fixed hole cooperation.