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636results about How to "Fast action" patented technology

Method for current differential protection of direct current electric transmission line

The invention discloses a method for current differential protection of a direct current electric transmission line, which comprises the following steps: according to a distributed parameter model of the electric transmission line, using mode transformation in a time domain to transform sampling values of direct current and direct current voltage into a modulus; then using the mode voltage and the current of two ends from two ends of a line respectively to calculate mode current of certain point of the line at each moment; and using the mode current to directly construct a current differential protection criterion, or synthesizing electrode current through electrode mode inverse transformation, and then constructing the current differential protection criterion according to the electrode current. The method can improve the sensitivity and the reliability of direct current line protection, has good controllability and high security, has a complete setting theory, overcomes the defects of the conventional traveling-wave protection as the main protection of a high-voltage direct current line, and requires no recognition of a traveling-wave wave head; besides, the calculation is simple. The method is mainly used for the current differential protection of the direct current electric transmission line in an electric power system, in particular for the protection of an ultra / extra high-voltage direct current electric transmission line.
Owner:XI AN JIAOTONG UNIV

Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region

The invention relates to the field of relay protection of direct-current transmission lines of power systems, in particular to a single-ended electrical quantity full-time quick-action protection method for recognizing faults inside and outside a high-voltage direct-current transmission line region. The faults inside and outside the high-voltage direct-current transmission line region are recognized by using an amplitude of a special frequency component of electrical quantity of the direct-current line side of a single-ended convertor station. The invention is mainly used in single-ended electrical quantity full-line quick-action protection of the direct-current transmission line in the power system, only needs to adopt the singe-ended electrical quantity, has low requirement on the sampling frequency and a simple algorithm, is easy to realize on the engineering, has the advantages of high action speed, good selectivity and high reliability, and is complete in theory and easy to integrate. The protection method in the invention can be used as the main protection of the direct-current transmission line instead of the traditional traveling wave protection, and is especially suitable for full-line quick-action protection of extra / super high-voltage direct-current transmission lines by using single-ended electrical quantity.
Owner:XI AN JIAOTONG UNIV

Automobile seat sliding track assembling machine and assembling method for same

The invention discloses an automobile seat sliding track assembling machine and an assembling method for same. The automobile seat sliding track assembling machine comprises a base, an assembling cylinder, a cylinder rack, an outer ejector block, an inner ejector block, a right guide track, a right limiting block, an inner sliding track rack, an end stopping block, a left limiting block, a supporting block, a side sliding track rack, a left guide track, a front clamping jaw, a front connecting rod, a front clamping cylinder, a rear clamping cylinder, a rear connecting rod and a rear clamping jaw. The automobile seat sliding track assembling machine is suitable for assembling automobile seat slide tracks. By the automobile seat sliding track assembling machine, assembly operation can be finished instead of manual work, and slide track components are clamped and assembled by the different cylinders. The automobile seat sliding track assembling machine has the advantages of large output force, high assembling speed, high efficiency, high quality and the like; the labor intensity of workers is effectively reduced; and the quality uniformity of products of assembly parts is ensured. In addition, the automobile seat sliding track assembling machine is compact in structure, high in reliability, stable in operation and low in cost.
Owner:ZHEJIANG LONGSHENG AUTO PARTS TECH CO LTD

Automatic punch equipment and processing method thereof

The invention relates to the technical field of FPC (flexible printed circuit) processing equipment, in particular to automatic punch equipment. The automatic punch equipment comprises a lower die, an upper die and a pressure cylinder, wherein the lower die is arranged on a rack, the upper die is located right above the lower die, and the pressure cylinder is used for driving the upper die to vertically move; the pressure cylinder is fixedly arranged on the rack; the rack is also provided with a feeding tray and a discharging tray; a feeding manipulator is arranged above the feeding tray; a discharging manipulator is arranged above the discharging tray; the processing method for the automatic punch equipment comprises the following steps: clamping an FPC material from the feeding tray by the feeding manipulator and transferring the FPC material to the lower die, and backwards moving the lower die to a punching position from a material fetching position; downwards moving the upper die to perform punching processing and then, returning to an original position; forwards moving the lower die to return to the material fetching position; transferring an FPC finished product into the discharging tray from the material fetching position by the discharging manipulator. Automatic processing of FPC punching is realized; manual feeding and discharging actions are not needed; a feeding position and a discharging position are more accurate; the processing quality of the punch equipment is greatly improved.
Owner:GUANGDONG HUAHENG INTELLIGENT TECH CO LTD

Intelligent five-shaft manipulator

The invention discloses an intelligent five-shaft manipulator. The manipulator comprises a manipulator body and five movement mechanisms, wherein a swing arm movement mechanism is supported on a vertical movement mechanism, and can be driven to realize upper and lower mobile positioning through the vertical movement mechanism; an overturning movement mechanism is supported on the swing arm movement mechanism, and can be driven to rotate by the swing arm movement mechanism; a horizontal movement mechanism and an actuating station rotary movement mechanism are supported on the overturning movement mechanism, and can be driven to rotate together by the overturning movement mechanism, and the horizontal movement mechanism can drive a telescopic arm to move to and fro in the length direction of a main arm; and a flange plate can be driven to revolve around the center of the actuating station rotary movement mechanism through the actuating station rotary movement mechanism; and the mounting positions of the five movement mechanisms are reasonably configured to reduce the bearing capacities of the swing arm movement mechanism and the horizontal movement mechanism, so that the intelligent five-shaft manipulator is not only fast in movement speed, small in inertia and flexible to operate, but is also high in positioning precision, high in stability and good in safety.
Owner:昆山威创自动化科技有限公司

DG feed line-containing current sequence component comparison mode fault section positioning method

The invention discloses a DG feed line-containing current sequence component comparison mode fault section positioning method comprising the following steps: gathering a current passing switches on two sides of a feed line in real time; detecting the feed line to have a fault, and calculating positive and negative sequence current components of the fault current; using an amplitude relation of thepositive and negative sequence current components to determine a fault type; determining the fault type as an asymmetry fault, comparing the negative sequence current phases on two ends of the feed line, and determining whether the section is the fault section or not according to the phase difference; determining the fault type as a symmetry fault, comparing the amplitudes of the positive sequence current on two ends of the feed line, and determining the fault section according to the ratio relation of said two. According to simulation, analysis and dynamic model tests, when different positions of the DG feed line have different types of faults, the method can correctly identify the fault sections with a high sensitivity and strong reliability; in addition, the method cannot be affected by DG types and capacities, transition resistance and crossing current factors.
Owner:STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY +2

Transmission line fault fast phase selection method based on S conversion

The invention discloses a transmission line fault fast phase selection method based on S conversion. The transmission line fault fast phase selection method based on S conversion includes following steps: (1) collecting the current of the protection element at the line side at real time; (2) executing phase-mode transformation on the fault component current and extracting the model component of the fault component current after filtering the power frequency component for the corrected current; (3) executing S conversion on the model component current signal to obtain complex time-frequency matrix of each model, obtaining the model and phase angle, judging the ground fault or non-ground fault according to the characteristic of the zero model phasor, using the relationship among the line model phasors for having fast phase selection operation; (4) respectively integrating for the wave form of the phase current at two sides of the time axis, describing the wave form characteristic and recognizing the fault phase while the fault is dual-phase ground fault. The method adopts the S conversion for extracting the single frequency model component of each model component at special time, the fault type is determined according to the relationship among the model phasors, the method has the advantages of high sensitivity, fast action speed and exact recognition.
Owner:SHANDONG UNIV

Fast responding control device of turbine leaf apex gap control system based on shape memory alloy

The invention discloses a fast responding control device of a turbine leaf apex gap control system based on a shape memory alloy (SMA). The fast responding control device of the turbine leaf apex gap control system based on the SMA comprises an SMA driving system and a vortex tube cooling system, wherein the SMA driving system comprises an SMA wire, a biasing spring and a movable board, the vortex tube cooling system comprises a vortex tube and a vortex tube cooling end cooling pipeline, one end of the SMA wire is fixed on a vortex tube cooling end outlet pipeline, the other end of the SMA wire is connected to the movable board, and the two ends of biasing spring are respectively connected to a power brake reinforcing rib and the movable board. The excellent memory recovering performance of the SMA under different temperature conditions and the immediate refrigeration and heating characteristic of the vortex tube are used, the fan outer flow of a corresponding working condition in different flying states is guided and cooled through the vortex tube and conducts the cooling treatment on the SMA, the recovering displacement and the recovering stress of the SMA under different temperatures are reasonably controlled, the adjusting and the control of realizing the power brake deformation of the biasing spring are combined, the leaf apex gap is changed, and the self-adaption active control on the leaf apex gap is expected to be realized.
Owner:南京长江工业技术研究院有限公司
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