18results about How to "Quick resection" patented technology

The invention discloses a full silicon carbide voltage sag treatment device and a control method. The device comprises a first silicon carbide static change-over switch K1, a second silicon carbide static change-over switch K2, a third silicon carbide static change-over switch K1, a third silicon carbide static change-over switch K3, an energy storage converter, an energy storage battery and three ports I, II and III, by utilizing the device, a fault source of voltage sag is positioned and treated by detecting the voltage state of a port, and grid connection / grid disconnection / removal is carried out on the energy storage converter according to actual requirements through an off-grid control algorithm and a grid connection control algorithm, so that rectification / inversion mode conversion is realized, and the reliability of the energy storage converter is improved. Input and output power is adaptively adjusted according to the change of power grid frequency, and bidirectional energy flow and peak load shifting are realized. According to the invention, the cost is low, rapid voltage sag treatment with millisecond-level response time can be realized, power supply of a sensitive load can be effectively guaranteed when a power grid fails, and the energy storage converter has a self-adaptive peak regulation function and has a certain practical value.

A digestive endoscope comprises a single-lumen digestive endoscope body, wherein a tube sleeve is arranged on the outer side of the digestive endoscope body in the circumferential direction; the tube sleeve comprises an inner sleeve body and an outer sleeve body which are stacked inside and outside, wherein the inner sleeve body and the outer sleeve body are both made of elastic materials, and the two sides of the inner sleeve body along the arc circumferential direction are correspondingly connected with the two sides of the outer sleeve body along the arc circumferential direction; a fixing ring is arranged at the front of the inner side surface of the inner sleeve body, and the fixing ring is sleeved with the digestive endoscope body; an arc-shaped inflation tube is arranged at the front of the outer side surface of the outer sleeve body, and a connecting tube is arranged between the two ends of the inflation tube, and the inflation tube and the connecting tube constitute a circumferentially closed tube body, and a long strip of gas injection tube connected with the inflation tube is arranged on the inflation tube. The tube sleeve can be unfolded to form an auxiliary sleeve, and the auxiliary sleeve can be used for "two-handed" operation.

The utility model discloses an electric split-phase protection device for a contact network, and relates to the field of electrified railway traction power supply systems. The system is composed of a signal acquisition unit, an interphase fault identification unit, a fault removal unit, a power supply unit, a man-machine interface unit and an information interaction unit. An analog quantity acquisition circuit of the signal acquisition unit is connected with the interphase fault identification unit through a high-speed PCIE bus. The switching value acquisition circuit, the electric split-phase fault identification unit, the fault removal unit, the information interaction unit and the man-machine interface unit of the signal acquisition unit are connected together through the CAN bus, and the power supply unit supplies power to each unit through a device backboard power supply loop. The device is used for identifying and removing the phase-to-phase fault of the overhead line system, can improve the identification rate of the phase-to-phase fault, shortens the fault removal time, and achieves the quick removal of the fault, thereby avoiding the large-area power failure of a traction power supply system, and guaranteeing the normal operation of an electric locomotive.

The hysterectomy device under the endoscope comprises a uterus lifting cup with the bottom and the top being open, an extension ring is integrally formed on the top of the uterus lifting cup, a top ring is fixed to the top of the extension ring, and a rectomy assembly penetrating through the extension ring is installed between the inner peripheries of the uterus lifting cup. An adjusting assembly is further installed on the inner circumference of the uterus lifting cup, a rubber suction cup used for adsorbing and fixing the bottom of the uterus is connected to the top of the adjusting assembly in a screwed mode, and a plurality of notches are formed in the periphery of the top ring. When the uterus is cut, the uterus can be fixed in an auxiliary mode, cutting stability is improved, the cut uterus can be taken out after being cut, adverse effects on the vagina of a patient due to the fact that the uterus is taken out from the vagina when the cut uterus is large in size are effectively avoided, and operation and use of medical staff are facilitated.

The invention discloses a generator-transformer unit intelligent fault diagnosis and tripping control method, system and device based on double microcomputer protection and a storage medium, and relates to the technical field of generator-transformer unit microcomputer protection and intelligent control. Constructing a multi-dimensional non-electric quantity sensing system based on the standardized electric quantity data, performing synchronous alignment and logic fusion on electric quantity and non-electric quantity signals by using a communication model, and outputting a state data set; the method comprises the following steps: performing intelligent fault identification and self-adaptive criterion generation, determining fault types, ranges and confidence coefficients, calling the self-adaptive criterion to establish hierarchical tripping and delay control logic, mapping fault levels into quick-break, delay and trend three-level action channels, and performing multi-source criterion collaboration and shunt output control through an arbitration mechanism among double devices. According to the method, the threshold value and the time delay can be dynamically adjusted according to different operation conditions, and accurate judgment of the fault type, the fault range and the confidence coefficient is achieved.

The utility model discloses a novel plasma electric cutting device for operation, and relates to the technical field of medical instruments, the novel plasma electric cutting device comprises a holding assembly and a cutting tool bit, the cutting tool bit is installed at one end of the holding assembly, and the holding assembly comprises an insulating protective sleeve and a metal conductive part for prostatic hyperplasia cutting operation; the novel plasma electric cutter comprises a cutter head and a metal conductive component, the metal conductive component is arranged in the cutter head, the metal conductive component is sleeved with an insulating protective sleeve, the cutter head comprises mounting components and a cutting component, the mounting components and the cutting component are used for prostatic hyperplasia cutting operations, and the cutting component is connected between one ends of the two mounting components. A traditional electric cutter with a single-layer cutting ring is low in efficiency and prolongs the operation time when cutting large-size tissue, while the design of the double-layer cutting ring in the scheme greatly enhances the operation performance, large soft tissue can be cut more quickly, the operation time is effectively shortened, and the anesthesia risk of a patient and the bleeding amount in an operation are reduced.

The application discloses a kind of cascade utilization battery pack power energy storage system, including cascade battery module, basic energy storage unit, bidirectional DC / DC converter, DC bus, bidirectional DC / AC converter, sensor assembly, solid-state switch group and controller.The application compared with prior art has the advantages that a kind of cascade utilization battery pack power energy storage system, including cascade battery module, basic energy storage unit, bidirectional DC / DC converter, DC bus, bidirectional DC / AC converter, sensor assembly, solid-state switch group and controller;The cascade battery module is divided into A, B, C three grades by comprehensive health index evaluation, and the same grade 4 cascade battery modules are connected in series to form a basic energy storage unit;Each basic energy storage unit is connected to DC bus by independent bidirectional DC / DC converter, and DC bus is connected to power grid or load by bidirectional DC / AC converter;Each basic energy storage unit is equipped with sensor assembly and solid-state switch group, and can independently complete system access or cut-off.

The present invention belongs to the field of aviation precision manufacturing and processing technology, and in particular, it relates to a CNC milling method for deep through grooves of annular hollow thin-walled parts, including horizontally clamping the parts on a CNC machine tool workbench; selecting a U drill with a radius equal to the corner R of the deep through groove and installing it on the CNC machine, and using the U drill to process all the corners R in place; using an indexable milling cutter to rough mill the part groove, and reserving the side wall support margin and the groove bottom support margin; using an end mill I to perform layered processing on the part groove to mill the side wall support margin of the part groove; and an end mill II to mill the groove bottom support margin from the outside of the groove bottom of the part groove until the deep through groove is formed. This technical solution uses a layered processing method to ensure sufficient margin support during the processing of the side wall of the deep through groove, effectively overcomes the influence of stress changes and cutting forces in the part, improves the surface quality of the part, and plays an important role in reducing the subsequent benchwork and grinding workload.

The invention discloses a system for protecting power electronic equipment in a direct-current micro-grid, relates to the field of micro-grid control, and aims to solve the problem that an existing low-voltage direct-current micro-grid protection technology lacks rapid fault point removal and inductive current oscillation suppression characteristics. The active current limiter is arranged between the DC-DC converter and the DC bus, and is used for limiting the current output by the DC-DC converter and then sending the current to the DC bus; and the controller is used for detecting the output current after current limiting of the active current limiter, comparing the output current with a preset current, controlling the IGBT switching tubes Q1-Q2 of the DC-DC converter to be switched off when the output current is higher than the preset current, and keeping the IGBT switching tubes Q1-Q2 to be switched on when the output current is not higher than the preset current. The invention is used for protecting the power electronic equipment.

The application discloses a kind of electric leakage protection device and rail transit power supply system, the device includes: multiple sets of electric leakage protection sub-device, it is set up one-to-one with the multiple traction substations of rail transit power supply system, it includes: ground leakage protection circuit, digital current selective trip protection circuit and switch, digital current selective trip protection circuit is connected with the corresponding switch by tail cable communication, and it is electrically connected with the corresponding ground leakage protection circuit by hard wire, for when receiving the electric leakage warning signal sent by corresponding ground leakage protection circuit, obtain and locate fault interval according to the current vector of all feeder loop inflow, outflow of the power supply interval to which itself belongs, and after positioning, remove fault interval. The switch between the two adjacent traction substations is connected by optical cable communication. Thus, the device can quickly and accurately remove the fault interval, reduce the power outage range, guide the maintenance personnel to carry out targeted maintenance, and maintain the continuity and stability of the power supply system.

The utility model discloses a battery insulation cover plate die cutting processing device which comprises a fixing frame, a plurality of die cutting devices and a control device, the die cutting devices are installed on the fixing frame, and the control device is connected to the fixing frame in a sliding mode and matched with the die cutting devices. The die cutting device comprises a fixing base, a supporting and positioning column, at least two guide sleeves, an adjusting frame, an adjusting block, a supporting table, a shearing block, a shearing column and a separating table, the supporting and positioning column and the shearing column are each sleeved with at least two guide sleeves, and the guide sleeves are connected to the fixing base. The supporting table and the shearing block are connected to the ends, close to the control device, of the supporting positioning column and the shearing column respectively. The die cutting processing device for the battery insulation cover plate is simple in structure, convenient and practical, and the supporting table of the die cutting device is matched with the shearing block to cut a film of the battery insulation cover plate, so that local burrs and injection molding parts of the battery insulation cover plate are quickly cut off, and meanwhile, the cutting difficulty is reduced.

The present application belongs to the technical field of electrified railway traction power supply, and particularly relates to a traction network multi-terminal longitudinal differential protection system and method under a double-sided through AT power supply mode. The system sets multi-terminal longitudinal differential protection elements according to uplink and downlink feeders, covers multi-terminal branches composed of traction substations, AT substations and partition substations, and each branch is configured with a current transformer. The protection element includes a power frequency variation current differential element, a T-line / F-line current differential element and a low-voltage differential current starting element, which are respectively adapted to fault transient and steady state characteristics, and realize rapid fault identification and accurate removal through cooperative action. The method combines current threshold criterion, voltage criterion and opposite side allowable signal to ensure the rapidity, selectivity, sensitivity and reliability of action, realize rapid removal of fault two-end power supply, reduce the fault isolation range, and ensure the safe and stable operation of the traction network.

The utility model discloses a steel strand girdling device, which relates to the technical field of cutting equipment and specifically comprises a sleeving part, an adjusting part, a handheld cutting machine and a mounting part, the adjusting part is mounted at the end part of the sleeving part, the handheld cutting machine is mounted on the sleeving part through the mounting part, and the handheld cutting machine is mounted on the mounting part through the mounting part. The sleeving part is arranged from the end of a steel strand needing to be annularly cut in a sleeving mode, the end of the adjusting part abuts against the end face of the steel strand, the depth, arranged on the steel strand in a sleeving mode, of the sleeving part is adjusted through the adjusting part, the output end of the handheld cutting machine acts on the periphery of the steel strand, and the steel strand is annularly cut by rotating the sleeving part and the handheld cutting machine. The girdling device is simple in structure, can quickly cut off the separated wires on the steel strand through the simple auxiliary sleeving part, and ensures the smoothness of a notch.

The utility model relates to a photovoltaic grid-connected metering cabinet, which belongs to the technical field of electric power system equipment and comprises a cabinet body, and a plurality of wire outlet holes are arranged at the bottom end of the cabinet body. Three layers of partition plates are sequentially arranged in the cabinet body from top to bottom, the internal space of the cabinet body is sequentially divided into a first cavity, a second cavity, a third cavity and a fourth cavity from top to bottom by the three layers of partition plates, a knife switch is arranged in the first cavity, a load control mutual inductor is arranged in the second cavity, a metering mutual inductor is arranged in the third cavity, and the metering mutual inductor is arranged in the fourth cavity. A photovoltaic circuit breaker and an anti-islanding device are arranged in the fourth cavity, and the knife switch, the load control mutual inductor, the metering mutual inductor, the photovoltaic circuit breaker and the anti-islanding device are sequentially connected in series and then externally connected with a UPS. And the online monitoring device is used for monitoring electric energy quality and is externally connected with an upper computer. According to the utility model, the safety and reliability of the metering cabinet in the daily use process are improved.

The invention relates to an intelligent low-frequency load shedding device applied to the technical field of power system protection, which comprises a frequency monitoring load shedding unit and a delay timing unit, and is characterized in that the frequency monitoring load shedding unit comprises a threshold setting module, a frequency monitoring module, an analysis master control module and a load shedding execution module; the delay timing unit comprises a timing control module and an electronic timing module, when the operation frequency of a power system is lower than a normal range, the low-frequency load shedding device can carry out further, comprehensive and intelligent analysis and judgment according to the frequency reduction degree, whether load shedding is executed immediately or not can be intelligently judged according to the frequency reduction degree, and the operation efficiency of the power system is improved. According to the method, intelligent delay can be carried out according to the frequency reduction degree if the frequency is reduced or the execution of load removal is delayed, so that unnecessary load removal under non-emergency conditions can be avoided, sufficient load can be effectively and quickly removed under emergency conditions, and stable operation of a power system can be effectively guaranteed.

The present invention provides a method and device for determining a fault line of a high-resistance grounding fault in a distribution network, the method comprising: injecting a compensation current into the distribution network through a controllable voltage source; reducing the output voltage amplitude of the controllable voltage source, thereby reducing the compensation current and obtaining the zero-sequence current value of each distribution line after the reduction; determining the fault line according to the zero-sequence current value of each distribution line after the reduction. The present invention adjusts the fault capacitive current compensation amount, injects the compensation current, and then gradually reduces the compensation current, thereby utilizing the current characteristics of the fault line to achieve accurate line selection of the high-resistance grounding fault line. By adopting the fault line selection method of the present invention, the action / alarm threshold of the line selection device can be appropriately increased to avoid erroneous action / alarm of the device, improve the fault characteristic amount during high-resistance grounding, achieve accurate selection of the fault line, and thus quickly remove the fault.

The utility model discloses a deflashing device for a rubber sealing ring, which relates to the technical field of sealing ring processing and comprises a base, an equipment shell is fixedly mounted on the base, a fixed rotating wheel is rotatably mounted on the equipment shell, a movable rotating wheel is movably mounted below the fixed rotating wheel, an O-shaped sealing ring is arranged between the fixed rotating wheel and the movable rotating wheel, and the O-shaped sealing ring is fixedly mounted on the base. A driving mechanism is fixedly installed on the equipment shell, the driving mechanism comprises a motor and a positioning sleeve which are fixedly installed on one side of the equipment shell, a driving shaft is fixedly installed at the output tail end of the motor, the tail end of the driving shaft is fixedly installed on a movable rotating wheel, and a cutting mechanism is installed on the equipment shell; the driving mechanism further comprises a driving lead screw rotationally installed in the positioning sleeve and a telescopic rod installed in the positioning sleeve in a sliding mode. According to the deflashing device for the rubber sealing ring, through cooperative use of the driving mechanism and the cutting mechanism, flashes on the inner side and the outer side of the sealing ring can be rapidly cut off.

The present invention provides a low-speed two-wheel charging device and a charging short-circuit protection circuit thereof, belonging to the field of electrical control and circuit protection, wherein the charging short-circuit protection circuit comprises: a short-circuit current acquisition circuit for acquiring the AC current in the main charging circuit of the low-speed two-wheel charging device and for converting it into a DC voltage; a window comparator circuit for detecting whether the DC voltage is between two predetermined threshold levels and outputting a corresponding level; a charging circuit switch protection circuit, which is an electronic short-circuit protection circuit, for protecting the charging of the low-speed two-wheel charging device; a digital logic control circuit, which is connected to the output end of the window comparator circuit and to the charging circuit switch protection circuit, for controlling the on and off of the charging circuit switch protection circuit based on the level output by the window comparator circuit. The present invention can avoid using a traditional mechanical short-circuit protection device to realize charging short-circuit protection, reduce the volume of the protection device, and increase the response to faults.