31results about How to "Shorten protection time" patented technology

The invention discloses a satellite-ground synchronization method for an on-satellite processing beam-hopping satellite communication system, and belongs to the technical field of satellite communication. By periodically inserting the beam hopping plan corresponding to the beam position into the downlink frame, the ground terminal can be effectively assisted to realize the fast access of the uplink in the beam hopping environment. In addition, in combination with the working principle of the phased-array antenna, the satellite-borne time transmission method oriented to phased-array antenna beam hopping application is provided, and the time reference consistency among multiple phased-array antennas and between each wave position receiving beam and each wave position transmitting beam is effectively ensured. The synchronous control time sequence of the phased-array antenna is provided, the beam switching serial data and the wave speed switching control pulse signal are separately transmitted, the beam switching serial data are sent in advance before the beam switch control pulse is sent, the protection time in the beam switching process is shortened, and the transmission efficiency of the beam hopping application is effectively improved.

The invention discloses an IGBT driving circuit of a motor controller and a motor controller. The IGBT driving circuit comprises a functional safety circuit disposed on a motor controller driving board, and a detection feedback circuit and a pulse width modulation (PWM) buffer circuit which are connected to the functional safety circuit. The detection feedback circuit detects an IGBT module of themotor controller and sends a specified fault signal to the functional safety circuit when detecting a specified fault of the IGBT module. The functional safety circuit, after making a judgment according to a preset fault handling rule and the received specified fault signal, outputs a corresponding control signal to the PWM buffer circuit. The PWM buffer circuit generates a PWM signal for drivingthe IGBT module according to the corresponding control signal, and controls the on-off state of the IGBT module to protect the IGBT module. The IGBT driving circuit has various protection functions,improves the stability and safety of the IGBT, and can achieve quick operation and timely protection.

The present invention discloses a distribution line adaptive protection method and system based on traveling waves, belonging to the technical field of line protection. At measurement points, far awayfrom a bus, of a fault line, the fault phase initial current traveling waves of the single-phase grounding faults are large, and the non-fault phase is zero; at measurement points, close to the bus,of the fault line, the fault phase initial traveling wave amplitude of the single-phase grounding faults are twice of the non-fault phase, and the polarity is opposite. At the measurement points, faraway from the bus, of the fault line, the fault phase initial current traveling waves of the two-phase grounding faults are large, and the non-fault phase is zero; and at the measurement points, closeto the bus, of the fault line, the initial current traveling waves of the fault phase and the non-fault phase of the two-phase grounding faults have no obvious features. The distribution line adaptive protection scheme can perform accurate and reliable motions for all the types of short-circuit faults. The propagation of the initial traveling waves cannot be influence by a grounding resistance condition, and therefore, the protection scheme can respond to the high-resistance grounding faults.

The invention discloses an IGBT driving device and system, belonging to the semiconductor power member technology field. The IGBT driving device and system solve problems that a conventional IGBT driving device is complex in the circuit and low in reliability. The driving device comprises a driving control unit and a voltage detection unit; the driving control unit is used for generating a turning-on driving signal and a turning-off driving signal, is used for performing staggered driving through the turning-on driving signal and the turning-off driving signal under control of a PWM signal and is used for performing soft turning-off on the IGBT through the turning-on driving signal and the turning-off driving signal when the IGBT is in short circuit; the voltage detection unit is used for detecting voltage between an a collector electrode and an emission electrode of the IGBT and determining whether a short circuit occurs on the IGBT according to the voltage between the collector electrode and the emission electrode.

The invention relates to a wild unattended dangerous chemical monitoring and warning device, comprising a solar charging module, a dangerous chemical monitoring module, a signal flare transmitting and warning module, a data wireless transmission module, a support and a mounting box, wherein a storage battery, the data wireless transmission module, a sensor in the dangerous chemical monitoring module and a signal control circuit board are arranged in the mounting box, the mounting box is arranged at the bottom of the support, and the mounting box is provided with an air inlet; one end above the support is connected with a solar panel which can rotate manually, the other end of the support is provided with a signal flare transmitter, the direction of the solar panel is regulated by virtue of a knob, and the bottom of the signal flare transmitter is provided with a round hole which is used for connecting an electric primer; and the support is internally provided with a connecting wire, one end of the connecting wire is connected with a control switch, and the other end of the connecting wire is connected with the signal control circuit board in the mounting box. The wild unattended dangerous chemical monitoring and warning device provided by the invention has high automation degree, operation and use convenience and good safety, working strength of field operation monitoring personnel is reduced, personnel protective time is shortened, and operation safety level is improved.

The invention discloses a high-speed railway seismic early-warning on-site monitoring system. The system can real-time pick up seismic original wave forms, conducts seismic analysis and makes corresponding determination, forms a P-wave early-warning and threshold alarm, and transmits seismic information to a traction substation system and a train control system separately through a traction substation interface and a signal interface module, thus the method can provide effective protection to trains in operation, and greatly shortens protection time for earthquakes. In addition, the method can transmit seismic alarm information to a center system of a high-speed railway seismic early-warning monitoring railway administration bureau, and ensures that the center system of the high-speed railway seismic early-warning monitoring railway administration bureau to provide earthquake safety and protection in a larger area.

The invention discloses a malicious website detection method and device and electronic equipment, and the method comprises the steps: obtaining a target URL corresponding to a webpage opening instruction when the webpage opening instruction is received; obtaining a URL feature value of the target URL, wherein the URL feature value corresponds to an input parameter of a machine learning model of a server; obtaining a weight parameter of a prediction function of the machine learning model after the training of the server is completed; based on the weight parameter, the URL feature value and a prediction function pre-stored in the client, performing calculation at the client to obtain a prediction value; judging whether the predicted value is within a preset range or not; and if the predicted value is not in the preset range, judging that the target URL is a malicious URL. By means of the scheme, prediction of the malicious website is achieved at the client side, comparison of a blacklist website library is not needed, a machine learning model does not need to be deployed at the client side, operations such as exporting, loading and starting of the model are avoided, and malicious website protection time is shortened.

The invention discloses a beam switching method based on a variable-length time slot, and the method is adaptive to a communication system in which a mobile terminal performs switching between beams,and solves a problem that a frequency-division multiple access system loses data while performing beam cross-region switching and resource utilization rate of a conventional time-division system is not high. In the method provided by the invention, the mobile terminal still monopolizes carriers. When crossing regions is not needed, the terminal only uses continuous data time slots only taking second as a unit. When crossing regions is needed, time slot length of the data time slots is determined according to duration, least detection times constraint and minimum service transmission rate of the mobile terminal in an available ben overlapped region, and a service detection time slot used for detection at a target beam is allocated. When crossing regions is completed, the detection time slotis canceled, and a mode only using the data time slot is recovered. In the method provided by the scheme of the invention, cross-region seamless switching of the mobile terminal is realized with little time slot protection cost.

The invention provides a direct current line fault rapid protection method and apparatus in an overhead line flexible direct current power grid. Multiple protection criteria are formed by introductionof DC under-voltage protection, DC voltage traveling wave protection and DC current traveling wave protection etc., and the reliability of a rapid protection algorithm is improved; and the transitionresistance tolerance capability and the noise anti-interference capability of the protection algorithm are enhanced by employing wavelet transform. Besides, the method and apparatus can be applicableto direct current power grids with any endpoint number by employing a parallel processing mode of lightning stroke interference and fault protection discrimination to further compress the protectiontime, and the reduction of the applicability due to complexity of a direct current power grid line structure, the change of the type of a converter, and the change of the direct current voltage levelis prevented.

A system for selectively grounding each of a plurality of short-haul buried utility conveyances coupled to a common long-haul buried utility conveyance to enable a conveyance locating signal transmitted through the long-haul conveyance to travel from the long-haul utility conveyance to a selected short-haul utility conveyance. The system includes a first optical switch for selecting each of the plurality of short-haul utility conveyances to be grounded, where the first optical switch is adapted to receive an optical signal and selectively output the optical signal on one of a plurality of optical fibers; and a second optical switch coupled to each of the plurality of optical fibers for grounding each short-haul utility conveyance in response to the optical signal on a corresponding optical fiber.

The network includes at least a network access layer, at least a network layer, at least a transmission layer, and at least an application layer. The network access layer includes at least a physical layer and at least a data link layer. The data link layer includes Ethernet data link layer, and lower data link layer of bearing the Ethernet data link layer. Using lower data link layer as trigger source detects topological change of spanning tree protocol. The invention shortens time for detecting topological change of spanning tree protocol from second order of magnitude to millisecond order of magnitude so as to shorten protection rearrangement time for the spanning tree protocol.

In a code division multiple access mobile communication system, a communication signal is modulated and multiplexed with different diffusion codes and is used in date communication between a base station (30) and each of mobile units (40, 41, 42). The communication signal is a time division multiplex signal with a repeated frame having a plurality of time slots (TS0, TS1, TS2) assigned to different radio channels, respectively. A slot synchronous signal is produced in accordance with a reference clock signal of a global positioning system. The time slots are synchronized between the base station and each of the mobile units in accordance with the slot synchronous signal.

The invention discloses an overcurrent protection circuit of an electric drive controller for an electric vehicle. The overcurrent protection circuit is characterized in that six paths of drive signals of an insulated gate bipolar transistor (IGBT) can be immediately switched off when bus or phase wire overcurrent exists in the electric drive controller for the electric vehicle; and when one path of the IGBT has an overcurrent failure, one path of failed drive signal is switched off, and the IGBT operates in a limping home manner. According to the invention, not only is the overcurrent protection of the electric drive controller for the electric vehicle realized, but also a motor can be ensured and maintained to operate continuously when the IGBT has the overcurrent failure, thus the safety of the electric vehicle is ensured.

The invention provides a method for deacidification in the platinum hydrosynthesis process. The method comprises the following steps: firstly, chloroplatinic acid hexahydrate and divinyl tetramethyl disiloxane are mixed into a reaction kettle according to the weight ratio being 1:(20 to 100); then nitrogen is introduced to exhaust air, the nitrogen is kept to be continuously introduced, meanwhile,the mixed solution is quickly stirred and heated, and the mixed solution reacts for a period of time; then NaHCO3 is dissolved into deionized water to form a NaHCO3 aqueous solution for standby application; then heating is stopped after a reaction in the reaction kettle is completed, the NaHCO3 aqueous solution under the state of quick stirring is added into the reaction kettle, continuous stirring and dispersing are conducted for a period of time until the mixed solution is cooled; and then after dispersing and cooling are completed, the nitrogen is stopped to be introduced, the aqueous solution and a complex are naturally layered, and the upper-layer complex is taken out and then dehydrated so as to obtain acid-free and anhydrous platinum water. Compared with the prior art, according tothe method, the utilization rate of NaHCO3 can be increased, meanwhile, the nitrogen protection time in the reaction process can be shortened, and thus the nitrogen cost is saved.

A system for selectively grounding each of a plurality of short-haul buried utility conveyances coupled to a common long-haul buried utility conveyance to enable a conveyance locating signal transmitted through the long-haul conveyance to travel from the long-haul utility conveyance to a selected short-haul utility conveyance. The system includes a first optical switch for selecting each of the plurality of short-haul utility conveyances to be grounded, where the first optical switch is adapted to receive an optical signal and selectively output the optical signal on one of a plurality of optical fibers; and a second optical switch coupled to each of the plurality of optical fibers for grounding each short-haul utility conveyance in response to the optical signal on a corresponding optical fiber.

An APT attack detection method and device provided by the invention can be used in the technical field of information security or other fields, and the method comprises the following steps: according to a segment and a reserved time length corresponding to each segment, a knowledge graph comprises an association relationship between an observable entity and an interested entity, and the observable entity corresponds to a low-order scene; an interested entity corresponds to a high-order entity, and then a context awareness computing technology is introduced into the security detection device, so that the detection device can sense the security condition of POS equipment based on a Windows system, performs real-time analysis on an abnormal event of an unknown APT attack, performs timely identification and detection before a large-scale attack event occurs, and shortens the protection time, and the level of a safety protection system can be greatly improved while the labor investment is reduced.

The interconnection system at least comprises a first resilient packet ring and a second resilient packet ring. Said resilient packet rings at least comprise a working station and a standby station. The method thereof includes: establishing a working channel between the first working station of the first resilient packet ring and the second working station of the second resilient packet ring in order to make inter-ring transmission; establishing a standby channel between the first standby station of the first resilient packet ring and the second standby station of the second resilient ring; when a failure happening in the working station or working channel is detected, the standby station uses the standby channel to make inter-ring transmission service.

The invention discloses a plating resisting tool for facilitating anti-plating use and plating layer removal, which structurally comprises a nut, a lower clamp fitting plate, a first screw, an upper clamp fitting plate, a U-shaped moving connector, a fulcrum connection plate, a fulcrum connector, a tension spring, and a clamp head. The left side of the bottom end of the upper clamp fitting plate is connected with the U-shaped moving connector in covered and fastened manner. In use, the plating resisting tool enables its injection to take less manpower through novel insulating injection equipment provided, temperature can be maintained during injection, water cooling can be carried out after injection, insulating protection can coagulate faster, time is saved, and using is facilitated; a scraping device which is provided allows a user to directly scrape off insulating paint or glue after plating, so that the inconvenience of manual scraping with a tool later is omitted.

The present invention discloses a distribution line adaptive protection method and system based on traveling waves, belonging to the technical field of line protection. At measurement points, far awayfrom a bus, of a fault line, the fault phase initial current traveling waves of the single-phase grounding faults are large, and the non-fault phase is zero; at measurement points, close to the bus,of the fault line, the fault phase initial traveling wave amplitude of the single-phase grounding faults are twice of the non-fault phase, and the polarity is opposite. At the measurement points, faraway from the bus, of the fault line, the fault phase initial current traveling waves of the two-phase grounding faults are large, and the non-fault phase is zero; and at the measurement points, closeto the bus, of the fault line, the initial current traveling waves of the fault phase and the non-fault phase of the two-phase grounding faults have no obvious features. The distribution line adaptive protection scheme can perform accurate and reliable motions for all the types of short-circuit faults. The propagation of the initial traveling waves cannot be influence by a grounding resistance condition, and therefore, the protection scheme can respond to the high-resistance grounding faults.

The invention discloses a signal acquisition controller, which quickly judges the overcurrent state of a three-phase alternating current. The signal acquisition controller comprises an input / output board and a central processing unit board, wherein the input / output board is used for receiving an alternating-current signal acquired by peripheral equipment on the three-phase alternating current, and conditioning the alternating-current signal to acquire an alternating-current conditioning signal, and is also used for executing the circuit protection action according to a protective signal sent by the central processing unit board; the central processing unit board is used for receiving a judging threshold value inputted by a user and judging whether the three-phase alternating current is inthe overcurrent state or not according to the judging threshold value and the alternating-current conditioning signal; if the three-phase alternating current is in the overcurrent state, the central processing unit board generates the protective signal and judges the protective signal is a quick protective signal or not; and if the protective signal is the quick protective signal, the protective signal is sent to the input / output board, otherwise the protective signal is sent to the peripheral equipment. The method and the device acquire and judge the alternating current directly, shorten thesignal acquisition time and the protective time during overcurrent.

The invention discloses a segmentation control method for low-voltage ride-through of a doubly-fed motor during symmetric drop of network voltage. The method comprises the following steps: respectively detecting the current of a rotor and the voltage of a DC bus; comparing the instantaneous values of real-timely detected current of the rotor and voltage of the DC bus with the respective upper limit values, determining the logic control signal of a crowbar circuit according to the comparison result, outputting the logic control signal as high level if either the current of the rotor or the voltage of the DC bus exceeds the limit value, and starting up the first-stage control; and after starting crowbar protection, continuing to detect the current of the rotor and the voltage of the DC bus, comparing the values with the respective lower limit values, outputting the logic control signal as low level if the current of the rotor and the voltage of the DC bus are smaller than the respective lower limit values, stopping operation of the crowbar circuit, recovering excitation control, and conducting the second-stage control. The segmentation control method can effectively realize fault ride-through of the doubly-fed motor, and simultaneously injects demagnetization current and reactive current into a power grid to shorten the crowbar protection time.

The present invention provides a method and device for rapid protection of DC line faults in an overhead line flexible DC power grid. Multiple protection criteria are formed by introducing protections such as DC undervoltage protection, DC voltage traveling wave protection, and DC current traveling wave protection, and the rapid protection algorithm is improved. Reliability; and wavelet transform is used to enhance the transition resistance tolerance and noise anti-interference ability of the protection algorithm. In addition, in order to further compress the protection time, the parallel processing method of lightning strike interference and fault protection discrimination is adopted, which is suitable for DC grids with any number of terminals, and will not be affected by the complexity of the DC grid line structure, the change of the converter type, and the DC voltage level. change to reduce its applicability.

The interconnection system at least comprises a first resilient packet ring and a second resilient packet ring. Said resilient packet rings at least comprise a working station and a standby station. The method thereof includes: establishing a working channel between the first working station of the first resilient packet ring and the second working station of the second resilient packet ring in order to make inter-ring transmission; establishing a standby channel between the first standby station of the first resilient packet ring and the second standby station of the second resilient ring; when a failure happening in the working station or working channel is detected, the standby station uses the standby channel to make inter-ring transmission service.

The invention discloses a steel wire rope dip-coating and oiling device and a using method thereof. The steel wire rope dip-coating and oiling device structurally comprises an oil storage pipe, threaded connectors and an oil injection hopper are arranged on the oil storage pipe, the threaded connectors are welded to the two ends of the oil storage pipe and communicate with the interior of the oilstorage pipe, and the oil injection hopper is welded to the middle of the upper end of the oil storage pipe and communicates with the interior of the oil storage pipe; the threaded connectors are connected with bent pipes through threaded grooves, the bent pipes are provided with U-shaped supporting rods and embedding grooves, the U-shaped supporting rods are welded to the inner walls of the bentpipes, and the embedding grooves are located in the upper portions of the interiors of the bent pipes; and first I-shaped guide wheels are arranged on the U-shaped supporting rods. According to the steel wire rope dip-coating and oiling device, rust stains on the surface of a steel wire rope can be cleaned before the steel wire rope is coated with oil, and the rust stains are prevented from beingmixed with oil after the steel wire rope is coated with oil, so that the time of protecting the steel wire rope by liquid oil is shortened, and the maintenance effect of the steel wire rope is improved.

The invention discloses a simple and practical ferrule coating device comprising a fixture body; a plurality of placing holes matched with optical fiber ceramic ferrules are formed in the fixture body; the fixture body is connected with a supporting rod; and the upper end of the supporting rod is connected with a wire hanging bracket located above the placing holes. By using the simple and practical ferrule coating device, the aims of scrubbing and coating a wired optical fiber ceramic ferrule product simply, conveniently and rapidly are achieved, the protection time for the wired optical fiber ceramic ferrule product is shortened, the finished product rate of the wired optical fiber ceramic ferrule product is effectively increased, the problem of coil breaking caused by coiling protectionoperation is effectively reduced, the complex coiling and uncoiling protection is reduced, and the waste of labor hours for operation is reduced; the finished product rate of the wired optical fiberceramic ferrule product is increased, and the production cost is reduced; and the simple and practical ferrule coating device is suitable for coating the wired optical fiber ceramic ferrule product and is particularly suitable for an optical fiber connector with a relatively long coil or a coated product relatively higher, easy to incline and not easy to protect and can also be popularized to product coating with the similar requirements.

The invention belongs to the technical field of aircraft cable winding protection, and particularly relates to a rotating tool for improving cable protection efficiency and a using method. The rotating tool for improving the cable protection efficiency comprises a front supporting panel, a rubber ring, a connecting supporting column, a hanging supporting column, a shell, a bearing, a fixing clampand a trigger. The rotating tool for improving the cable protection efficiency is novel in structure and convenient to operate, the cable protection efficiency can be greatly improved, the cable protection time is shortened, and the production cost is saved. The rotating tool is not only suitable for the field of aircraft assembly and aviation, but also can be applied to the field of assembly of automobiles and other similar machines, and has wide social application value.

The invention provides an air conditioner control method for greenhouse low-temperature refrigeration. The air conditioner control method comprises the steps that S1, the current outdoor environment temperature T4 and the indoor unit evaporator pipe temperature T2 are detected; S2, the temperature interval to which the outdoor environment temperature T4 belongs is judged, wherein the outdoor environment temperature T4 is divided into a plurality of temperature intervals, each temperature interval corresponds to the capacity requirement of one outdoor unit, an air conditioner is controlled to operate in a refrigeration mode, and an outdoor unit of the air conditioner is controlled to operate according to the current outdoor environment temperature T4 and the capacity requirement of the corresponding temperature interval; and S3, the capacity requirement of the outdoor unit is adjusted according to the indoor unit evaporator pipe temperature T2, when the environment temperature is high or the evaporator pipe temperature is large, the refrigeration effect can be improved, refrigeration and cooling are rapid, the low refrigeration temperature can be maintained, and the greenhouse low-temperature refrigeration application range is met along with reduction of the indoor and outdoor environment temperature.

The present invention discloses a combined on-off control system. The system comprises a programmable logic controller (PLC), a signal acquisition controller and an advance electricity leakage detector. The signal acquisition controller and the advance electricity leakage detector are respectively connected with the PLC. The signal acquisition controller is used for acquiring three phase AC current, comparing the three phase AC current with a preset current threshold value and judging whether overcurrent occurs or not. When overcurrent occurs, whether quick protection is to be carried out or not is judged. If quick protection is to be carried out, output first on-off control signals. Otherwise, send protection signals to the PLC. The advance electricity leakage detector is used for measuring the resistance of an electricity leakage resistor and sending the resistance to the PLC. The PLC is used for judging whether the resistance of an electricity leakage resistor is smaller than a preset resistance threshold value or not. If the resistance is smaller than the preset resistance threshold value, output second on-off control signals. The second on-off control signals are output according to the protection signals. The system can acquire data in environments and carry out quick overcurrent protection and advance electricity leakage protection.