103results about How to "Will not cause malfunction" patented technology

The invention relates to a detector for electrical fault, in particular relating to a fault detector in transmission lines. A distributed DC ground fault detector in the invention comprises a DC power supply circuit each branch of which is provided with a ground detector, the ground detector is composed of an isolated power and a detecting sub-unit, and the positive and negative buses of the DC power are connected with each branch by the isolated power; and one end of the detecting sub-unit is connected with the isolated power, and the other end thereof is connected with a DC detecting host for communication by a data transmission bus. The distributed DC ground system of the invention has higher precision for judging fault than that of a centralized DC grounding system, and can be widely used in various power systems.

The invention discloses a method and a device for storing a message to solve the problem of single node storage in the prior art. The method comprises the following steps: receiving a message addition request; selecting a storage node from a preset storage node list, storing the message; and storing the mapping relationship between the message and the storage node storing the message. The scheme can solve two problems: the first one is that when one of the storage nodes goes wrong, the message can be stored into other nodes, so that a message middleware is out of order is avoided; the second one is that if the message traffic is excessive, the storage pressure can be distributed on the plurality of storage nodes. The invention also discloses a message processing system so as to solve the problem that the storage of a message by a single node to be forwarded is likely to cause system bottleneck and processing interrupt.

An equal transmission-variation instant value differential protecting method of remote electric transmission line microcomputer includes processing voltage and current sampling values by the same low-pass filtering treatment to obtain instant values of voltage and current, using voltage mutual inductor to process current sampling value to make primary electricity of transmission line and instant value used in differential protection-calculation be basically the same as transmission-variation link if voltage mutual inductor is applied on transmission line. The protecting method for transmission line with reactor is also disclosed.

The invention discloses a low delay filter design method for sampling rate conversion in an electronic transformer. The method comprises the steps of first adopting cascade connection of an interpolator and an extractor to achieve conversion of random fraction ratio sampling frequency, enabling an anti-image filter in the interpolator and an anti-aliasing filter in the extractor to be combined into a low pass filter; then adopting a mean square error minimization standard to solve a coefficient vector of the filter, enabling a filter transmission band amplitude and a stop band amplitude to serve as constraint conditions, and enabling mean square error minimization to serve as an optimized target; and finally enabling a solving process of the filter coefficient vector based on constraint least square method design to be converted into solving of a positive definite quadratic programming problem so that the filter coefficient vector can be obtained by direct solving. According to the method, the problems that large output delay is caused in the direct linear convolution filtering process and the higher the filter order, the larger the group delay are solved, and rapidity of protection action is greatly improved.

The invention belongs to a wet material granulation principle and an equipment combination process, and particularly relates to a combined-type granulator. The combined-type granulator comprises a plurality of layers of combined box bodies, a temporary storage feed bin and a plurality of layers and groups of roller mills. Each group of roller mills is equipped with a rotary joint, a cleaning blade, an elastic stripping frame, a material baffle and a guide plate; a waste gas emptying interface is also arranged on each of the box bodies, and an air inlet at a lowest layer of the granulator is arranged on a bracket. The linear velocity of a tooth surface and the flow rate of volume of a rotary drum of each of the roller mills at a second layer are higher than those of a rotary drum of each of the roller mills at a first layer, and the linear velocity of a tooth surface and the flow rate of volume of a rotary drum with a reticular tooth socket or a single radial tooth socket of each of the roller mills at an adjacent lower layer are designed according to the volume properties of materials in the area. According to the granulator disclosed by the invention, hard foreign matters can be stripped, and simple granulation of soft materials in a cream state, a paste state, a slurry state and the like can be realized; meanwhile, caky and blocky materials can be pulled into monomer granules, soft and hard materials can simultaneously enter into the granulator, and granules at an outlet have a plurality of pores and are in an irregular shape.

A containerless casting core forming machine comprises a multi-axis motion system (30) comprising an X-axis motion system (31), a Y-axis motion system (32) and a Z-axis motion system (33),a cutting system(80)which is connected with the multi-axis motion system, a driving system (70) which drives the multi-axis motion system, and a seat (50) which the multi-axis motion system is fixed above. Most of sand produced by cutting fall down below the seat and could not spread into the multi-axis motion system. Therefore, the malfunction is decreased, and the precision and the service life of the containerless casting core forming machine is improved.

The invention is applicable to the field of nuclear power station instrument control, and provides a nuclear power station reactor protection system testing method and an apparatus thereof. The method comprises the following steps: triggering a CPU onsite testing signal; triggering a binary testing signal; determine a blocking signal according to the CPU onsite testing signal and the binary testing signal, wherein the CPU onsite testing signal is not always being 0 in the presence of the binary testing signal; determining an action signal according to the binary testing signal; and executing a corresponding operation according to the locking signal and the action signal. The method and the apparatus can reduce the probability of occurrence of misoperation of AV42.

The invention provides a circuit for preventing power up instantaneous shock in inverter air conditioner which includes a positive temperature coefficient thermistor series connected with AC electrical source front line in air conditioner system, a power relay switch parallel connected with two sides of the positive temperature coefficient thermistor, the power relay coil and a controllable switch device are series connected between electrical source and ground electrode, the controllable switch device control end is connected with one electrical source in air conditioner system. The circuit provided by the invention can prevent current shock in power up instantaneous, and can conquer disadvantage of poor anti-interference performance in present device because of impervious for main control singlechip reduction, and protect air conditioner system normal working more efficiently.

The invention discloses a sulfur hexafluoride gas density relay, a signal generator is good in connecting point contacting and electrical performance, service life is long, and accuracy is high. The sulfur hexafluoride gas density relay comprises a shell body, a base, an end base, a Burdon tube, a temperature compensate element, a machine core, a plurality of microswitches, switch adjusting mechanisms and a signal trigger mechanism. The end base, the Burdon tube, the temperature compensate element, the machine core, the plurality of microswitches, the switch adjusting mechanisms and the signal trigger mechanism are arranged in the shell body. The number of the switch adjusting mechanisms is the same as that of the microswitches. Each switch adjusting mechanism comprises a fixing piece, a rotating shaft rivet a spring and a rotating piece. One end of each fixing piece is connected with the other end of each rotating piece through each rotating shaft rivet and each spring. The other end of each fixing piece is fixed on the base, so that each rotating shaft rivet and a sector gear shaft are coaxial. The other end of each rotating piece is fixedly provided with each microswitch. The signal trigger mechanism comprises a signal trigger mechanism shaft and a plurality of cams. The signal trigger mechanism shaft is coaxially connected to one end of the sector gear shaft. The cams are arranged on the signal trigger mechanism shaft and abut against connecting point operation handles of the microswitches.

The invention discloses a spindle positioning mechanism of a horizontal boring machine. The mechanism comprises a controller, a spindle motor for driving a boring rod to rotate, a position induction part and a sensor, wherein the position induction part is arranged on the boring rod; the sensor is used for detecting the position induction part; the signal output end of the sensor is connected with the controller; and when the boring rod stops positively rotating and negatively rotates to a stop allowable position, the sensor detects the position induction part and outputs a signal to the controller, and the controller controls the spindle motor to stop. By the mechanism, the positioning accuracy and reliability of a spindle of the horizontal boring machine can be obviously improved. The invention also discloses the horizontal boring machine with the spindle positioning mechanism.

The invention discloses a working-condition self-adaptive lifting and falling-prevention device of a scaffold. The working-condition self-adaptive lifting and falling-prevention device of the scaffold comprises a scaffold lifting mechanism, a lever type linkage mechanism and a falling-prevention mechanism, wherein the scaffold lifting mechanism, the linkage mechanism and the falling-prevention mechanism are arranged on a frame, a bolt hole which is connected with a scaffold frame is formed on the lower portion of the frame, the scaffold lifting mechanism is connected with the falling-prevention mechanism through the linkage mechanism, and the upper portion of the linkage mechanism is connected with an outer wall. The working-condition self-adaptive lifting and falling-prevention device of the scaffold has the advantages of well achieving purposes of normal lifting and falling-prevention due to the fact that an integrated drive system is formed by achieving the normal lifting function through the scaffold lifting mechanism, achieving real-time monitoring and transmission to a lifting state through the linkage mechanism and achieving the emergency-brake handling to sudden accidents through the falling-prevention mechanism; being skillful in design, convenient to install, safe and reliable, particularly suitable for the scaffold in the high-rise building construction and good in popularization and use value.

The invention discloses a coating material for electrostatic spraying on a polypropylene automobile bumper bar. The coating material is prepared from 8-15 parts by weight of polyurethane resin ester, 10-20 parts by weight of polyester resin, 18-28 parts by weight of modified functional resin, 5-10 parts by weight of ethyl acetate, 5-10 parts by weight of butyl acetate, 0.5-2 parts by weight of an auxiliary agent, 5-10 parts by weight of acrylic resin, 0.5-2 parts by weight of a resistance regulator and 30-40 parts by weight of colorant paste. The preparation method comprises the following steps: a. adding the polyurethane resin ester, the polyester resin, the modified functional resin, the ethyl acetate, the butyl acetate, the auxiliary agent, the acrylic resin and the resistance adjusting agent into a blending kettle and carrying out uniform stirring, b. according to the color of the automobile coating, adding 80-95% of the corresponding colorant paste into the above mixture, carrying out stirring, detecting the color of the coating film, and according to color difference, continuously adding different colorant paste to adjust the color so that the coating film color satisfies the standard, and c. carrying out detection, and when the coating film is qualified, carrying out filtration and packaging.

The invention discloses a motor winding temperature estimation and protection method. The method comprises the following steps: S1, obtaining a BP neural network heat dissipation model of a motor winding; S2, calculating the temperature of a motor winding; S3, protecting a motor winding. Due to the fact that the neural network can conduct accurate modeling on the heat dissipation process under thecomplex heat dissipation condition, the method is more suitable for application scenes with the complex heat dissipation condition; a winding heating temperature change rate caused by loss is calculated by using the motor winding current; the winding temperature is calculated according to the winding heat dissipation temperature change rate and the winding heating temperature change rate; the calculated winding temperature is used to limit motion control output of the motor by using a multi-segment temperature cut-off curve so as to carry out temperature protection on the winding and preventdamage caused by overhigh temperature of the winding.

The invention relates to locomotive traction converter network voltage fluctuation control, in particular to a locomotive traction converter network voltage fluctuation composite detection control device and a control method thereof. The invention provides the locomotive traction converter network voltage fluctuation composite detection control device and the control method thereof to solve the problems and defects existing in an existing locomotive traction converter network voltage fluctuation detection control method. The method is realized through four-quadrant rectifier control software.The voltage outer loop of the control device is changed into a sliding mode controller from a traditional PI controller, and a multiple control algorithm is further added, so that on one hand, the network voltage jump quantity can be quickly controlled when network voltage fluctuation is detected, and on the other hand, the pollution of alternating-current side current harmonics to a power grid isreduced. The robustness and the anti-interference capability of a control system are improved; faults of a locomotive high-voltage system, a traction system, an auxiliary system and the like cannot be caused when network voltage fluctuation occurs; thus safe and stable operation of a train is guaranteed.

The invention belongs to the technical field of aviation onboard communication, and particularly relates to an acentric communication method suitable for an aviation onboard communication system. The acentric communication method comprises the steps that an annular buffer zone is established inside each aviation onboard communication device, wherein the annular buffer zone comprises n data storage units sequentially arranged in a clockwise direction or an anticlockwise direction, the first data storage unit and the nth data storage unit are adjacent, and the annular buffer zone of each aviation onboard communication device is provided with a storage pointer; when at least one aviation onboard communication device needs to transmit a data package, acorresponding aviation onboard communication device transmits the data package to an Ethernet switch periodically; when at least one aviation onboard communication device receives the data package from the Ethernet switch, the received data package is stored into the data storage unit, in which the storage pointer is placed, then the storage pointer moves clockwise or anticlockwise to anext data storage unit.