130results about How to "Protection reliability" patented technology

The invention provides a charging pile interaction terminal. The charging pile interaction terminal comprises a phase selection switch, a current detection module, an analog digital conversion conditioning sampling unit, a communication module and a microprocessing unit, wherein the phase selection switch is provided with a three-phase input end, the three-phase input end is electrically connectedwith three-phase cables of distribution transformers respectively, and the output end of the phase selection switch is electrically connected with charging piles; the input end of the current detection module is electrically connected with the output end of the phase selection switch, and the output end of the current detection module is electrically connected with the input ends of the chargingpiles; the analog digital conversion conditioning sampling unit is provided with a first input end electrically connected with the three-phase input end and a second input end electrically connected with the current detection module; the input end of the microprocessing unit is electrically connected with the output end of the analog digital conversion conditioning sampling unit; the input end ofthe communication module is electrically connected with the output end of the microprocessing unit, and the communication module is connected with a distribution network control center and the charging piles through communication respectively. Flexible dynamic load regulation is realized.

The protection device is suitable to the on-line protection of the short circuit failure at DC 220 voltage, +/- 110 voltage in power plants and transformer substations. The invention is realized through following steps. The detection circuit for the short circuit in the branch through the data collection circuit, A/D conversion circuit is connected to the industrial control computer. The detection circuit for the bus voltage through the data collection circuit, A/D conversion circuit is connected to the industrial control computer. The detection circuit for the state of the breaker through the optical isolation input circuit is connected to the industrial control computer. The current criterion is I is greater than or equal to Id, and the voltage criterion is U is less than or equal to Ud.

The invention relates to a self-feedback linear galvanostat integrating an adjustable thermistor, which belomngs to the technical field of a semiconductor power device. The self-feedback linear galvanostat comprises a junction-type field effect transistor (JFET) and an adjustable thermistor, which are integrated together, wherein one end of the adjustable thermistor is connected with a JFET source electrode, and the other end is connected with a grid electrode of the JFET. The self-feedback linear galvanostat is centralized on the adjustable thermistor, and the adjustable thermistor can obtain a resistance value meeting the requirement of the output current through a laser cutting way, so that different types of products can be obtained in the same batch. The thermistor is a positive temperature coefficient, under the working situation, the temperature is increased, the resistance is increased, the output current is reduced, and the reliability of an application system is protected. The self-feedback linear galvanostat has advantages of high integration, stability in output current, adjustability of the current and good temperature property and can be applied to the fields such as light emitting diode (LED).

The invention relates to a method for enhancing differential protection performance by the coordination of mutation quantity fault discrimination and fuzzy harmonic analysis, which utilizes different characteristics of difference current and braking current mutation quantity to distinguish the internal and external faults of an area under different fault conditions. After a fault type is distinguished by the discrimination method, a fuzzy harmonic analysis criterion is combined to enhance the accuracy of fault discrimination so as to enhance the reliability and sensitivity of differential protection. The method is already adopted in a complete set of protection device of a DSA serial transformer and both the simulation results and the site practical situation indicate that the method has good prevention effect on reasons which easily cause differential misoperation, such as TA saturation, sympathetic surge, AD abnormity, and the like.

The invention discloses a torque wrench used for assembling and disassembling working tips of ultrasonic medical equipment. The torque wrench comprises a wrench cover and a wrench seat. The upper portion of the wrench seat is arranged in the wrench cover in a sleeved and fixed mode. The lower portion of the wrench seat is of a hollow columnar structure with ends sealed. A wrench position opening is formed in a sealed opening of the wrench seat, and a working tip groove penetrating through the wrench position opening is formed in the circumferential surface and a sealing opening on the lower portion of the wrench seat from outside to inside. The torque wrench further comprises an insert. The insert is fixed to the upper portion of the sealing opening, an insert position opening is formed in the position, corresponding to the wrench position opening, of the insert, a working tip groove penetrating through the insert position opening is also formed in the position, corresponding to the working tip groove, of the insert from outside to inside, a clamping groove penetrating through the insert position opening is further formed in the insert, and a clamping piece is arranged in the clamping groove. The working tip groove can penetrate through the wrench position opening from the lower portion of the wrench seat to be clamped into the torque wrench from the lateral side, and therefore working tips of all shapes can be inserted into the torque wrench and can be assembled or disassembled.

The invention discloses a differential protection method for double-terminal high-voltage direct current transmission lines. The specific steps are as follows: 1, constructing equivalent line models of out-of-zone and in-zone fault DC power transmission lines; 2: describing the voltage and current of the two measuring terminals of each pole DC line and the mathematical expressions in time domain related to the voltage and current; 3, describing a time domain mathematical expression of the integral expression of the voltage difference and the integral expression of the current sum, constructinga calculation term of the integral expression of the longitudinal impedance based on the fault component and the total fault quantity, and qualitatively analyzing the fault state result according tothe longitudinal impedance protection idea; 4, construct an improved criterion of current differential protection according to that qualitative analysis result. The method of the invention overcomes the problems that the traditional DC line differential protection lacks a relatively stable braking amount and is susceptible to high-frequency harmonic interference generated by line distributed capacitance, operation of power electronic devices and the like.

The invention relates to the information technical field, disclosing a virtual leased line (VLL) failure monitoring method and device, where the method firstly receives the message sent by local user end to opposite user end from the VLL; judging whether the received message is a link protocol message and when the message is a link protocol message, judging whether the link protocol message is a failure message. In addition, the invention provides a VLL failure monitoring device. And the invention can monitor the link failure in any position when the same media are interconnected and fast reroute VLL service according to the monitored failure, so as to be able to effectively protect VLL service reliability.

The invention discloses a goods sorting system and a sorting method. The goods sorting system comprises a feeding device, a transmitting device, a pushing device, a kick-off device and a sorting bin. The sorting bin comprises a plurality of bin bodies; the feeding device, the transmitting device, the pushing device and the kick-off device are sequentially connected; the transmitting device is a U-shaped rotation channel which comprises a feeding line and a blanking line; the feeding device is used for conveying goods onto the feeding line; the pushing device is connected with the feeding line and the blanking line, and is used for pushing goods detected on the feeding line to the blanking line; the kick-off device is used for kicking off each goods on the blanking line into one bin body; the sorting bin is located under the kick-off device; the goods sorting system further comprises a controller; and the feeding device, the pushing device and the kick-off device are controlled by the controller. The goods sorting system is compact in structure and can realize automatic sorting of goods.

The invention proposes a protection system, which comprises a control module, three output modules, a triple safety protection loop and a controlled object, wherein the control module outputs protection instructions; the three output modules are electrically with the control module and divide the protection instructions into three paths of independent protection instructions; the triple safety protection loop is electrically connected with the three output modules; and the controlled object is electrically connected with the triple safety protection loop. When two and more than two paths of protection instructions in the three paths of independent protection instructions are effective, an action is started to protect the controlled object, and otherwise the action is not started.

The invention relates to a full impedance distance protection method based on an FPGA. The method includes the steps of 1 calculating impedance protection, 2 adopting an upper computer for definite value matching, 3 adopting a shifting multiplication and division method, 4 adopting a state machine for time division multiplexing, 5 testing the impedance protection characteristic and 6 carrying out simulation testing. Based on a hardware platform of the FPGA, the FPGA is used for calculating the processing speed of improving the hardware protection logic in parallel at high speed to ensure the safety and reliability of motions. By the adoption of a full impedance distance protection hardware algorithm based on the FPGA, judgment processes of starting elements such as positive sequence voltage, negative sequence voltage and currents are reduced, and real-time calculation and logical judgment are carried out to further protect the reliability of relay protection motions.

The invention relates to the field of strip steel rolling production, in particular to a fixed-width trimming device and method for cold-state strip steel. The fixed-width trimming device for cold-state strip steel comprises two rows of high-pressure spray nozzles, a turning roll, a tensioning unit, a scrap cutter and a control device, wherein the two rows of high-pressure spray nozzles are arranged at the two sides of strip steel respectively in a direction consistent with the moving direction of the strip steel. The fixed-width trimming method for cold-state strip steel comprises the following steps: tensioning strip steel so that the surface of the strip steel is flat and straight and has stable tension; preparing the mixed solution for spray cutting, wherein the high-pressure spray nozzles adopt the mixed solution of industrial pure water and abrasive; and finally controlling the high-pressure spray nozzles to perform trimming by the control device. Based on the high-pressure abrasive jet cutting technology, the device and method provided by the invention realize combination of high-speed cutting and good cutting quality; and smooth-transition tracking cutting is adopted in width specification switch of the strip steel, an S-shaped track is obtained, and the breakage probability of the welded seam area is effectively reduced.

The invention provides an extra-high voltage converter transformer network side 750kV outgoing line matching structure which is simple in structure, good in insulating property and convenient to transparent. The extra-high voltage converter transformer network side 750kV outgoing line matching structure comprises a box cover higher than the edge of a converter transformer box, a flange on the box cover, and an inclined lifting seat and a straight lifting seat which are connected sequentially on the flange on the box cover; the edge of the box cover is inclined downwards and is connected to the edge of the converter transformer box; the flange on the box cover is arranged on the inclined part of the box cover; the top end of the inclined lifting seat is connected horizontally with the straight lifting seat, the bottom end of the inclined lifting seat is arranged obliquely and is connected to the flange on the box cover; the diameter of the straight lifting seat is smaller than that of the top end of the inclined lifting seat, and the diameter of the top end of the inclined lifting seat is larger than that of the bottom end; the side, close to the box cover, of the bottom end is higher than the side close to the edge of the converter transformer box; the side wall, close to the edge of the converter transformer box, of the inclined lifting seat is arranged obliquely outwards; the network side outgoing line is lead out vertically from the flange on the box cover, the end of the network side outgoing line is lower than a transportation outer limit outline; the network side outgoing line is connected to a network side sleeve or external lead by a voltage sharing device arranged in the inclined lifting seat.

The invention discloses an online type automatic adhesive dispensing machine. The online type automatic adhesive dispensing machine comprises a master control module, a feeding module, a CCD locatingdetection module, a mechanical motion module, an adhesive dispensing module, a detection module and a removal module. The master control module is internally provided with a screening unit. The screening unit is internally provided with a scrap choice box and a dispensed adhesive supplement choice box, wherein the scrap choice box and the dispensed adhesive supplement choice box can be manually clicked for selection. An adhesive dispensing process of the online type automatic adhesive dispensing machine comprises a feeding procedure, an adhesive dispensing procedure, a detection procedure, a detection compensation procedure and a discharging procedure. By means of the online type automatic adhesive dispensing machine, the adhesive dispensing missing condition of parts subjected to adhesivedispensing can be preliminarily detected; by means of the screening unit in the master control module, manual input is conducted on screening elements namely the scrap choice box and the dispensed adhesive supplement choice box, and operators can flexibly change the screening mechanism according to the actual condition of the parts subjected to adhesive dispensing; in a secondary detection work group adopted in the adhesive dispensing process, quality detection is conducted on an adhesive dispensing face, so that quality detection precision of the parts subjected to adhesive dispensing is greatly improved; it is guaranteed that the parts which is subjected to adhesive dispensing and flow into the market are high-quality products; and the brand value is increased.

The invention provides a composite high voltage semiconductor device; a layout comprises a straight edge portion arranged in a straight line; the straight edge portion comprises enhanced devices including the following: a semiconductor substrate; a first high voltage trap and a second high voltage trap arranged in parallel in the semiconductor substrate; a first field oxide layer arranged in the first high voltage trap; a first drain electrode ohmic contact zone arranged in the first high voltage trap of a first side of the first field oxide layer; a first source electrode ohmic contact zone arranged in the second high voltage trap; a first grid electrode at least covering the semiconductor substrate between the first source electrode ohmic contact zone and a second side of the first field oxide layer, wherein the first side of the first field oxide layer is far away from the second high voltage trap, and the second side of the first field oxide layer is close to the second high voltage trap. The doped concentration of the second high voltage trap is smaller than that of the first high voltage trap. The reliability of the device can be improved.

The invention relates to a crossing vehicle guide sign device of blocked roads and a control method and application thereof. The crossing vehicle guide sign device comprises a first judgment module, a first control module, a second control module and a display module. The first judgment module is connected with the first control module and the second control module respectively; and the first control module and the second control module are respectively connected with the display module. A light emitting diode (LED) display element is adopted for the display module and has two working states, namely driving-out port marking and driving-in port marking. The control method of the crossing vehicle guide sign device is used for controlling changing states of the changeable sign device located at crossings of the express way. By adopting the crossing vehicle guide sign device of blocked roads and the control method and application thereof, reliable and effective control, directing and management for traffic flow at the crossings of the express way can be achieved, the problem of resource utilization waste of the crossings of the express way and signal devices at the crossings can be solved, express way construction cost is reduced, driving operation difficulty of drivers at the crossings of the express way is reduced, and express way traffic efficiency and safety coefficient are improved.

The invention discloses a method for protecting a transmission service and a sink node thereof, which belong to the field of network transmission. The method comprises the following steps: a sink node that is connected with main/standby communication devices detects the operating states of the main/standby communication devices and judges whether the detected states of the main/standby communication devices are the duty state; if yes, the service is transmitted between the sink node and the main/standby communication devices; if the detected states are the backup state, the service directly reaches through the sink node and is transmitted to the next sink node. The sink node comprises a detecting module, a judging module, a transmitting module and a reach-through module. The method ensures the reliability of the service transmission, ensures the simple operation and the low development cost of the service transmission, greatly reduces the transmission band width, increases the band width utilization rate, reduces the transmission cost and the running/maintenance cost, and improves the network reliability. The method and the sink node are widely used for the transmission of the point-to-multipoint backup service.

The invention relates to a law-related personnel group portrait analysis system and method. The method mainly comprises six parts of law-related data fusion and preprocessing, law-related data deep desensitization, fusion data feature processing, law-related personnel group mining, group portrait construction and portrait display. Deep desensitization is carried out on judicial data, information leakage is prevented, information safety is protected, and for group portraits of legal personnel involved in multiple service systems, special groups can be mined conveniently, and targeted strategy making is carried out; besides, the method has certain flexibility, portrait features can be adjusted according to user experience, and visual display can be performed for special groups.