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878 results about "Line length" patented technology

In typography, line length is the width of a block of typeset text, usually measured in units of length like inches or points or in characters per line (in which case it is a measure).

Fault distance measuring method for combined travelling wave of power transmission line

The invention provides a fault distance measuring method for a combined travelling wave of a power transmission line. The method comprises the following steps of: firstly, performing primary fault distance measurement with the single-end principle to obtain two possible fault positions; and then, comparing the time difference of the fault initial travelling wave arriving at the two sides of the line with the time difference of the fault travelling wave arriving at the two ends of the line after the possible fault points fail, so as to obtain the real fault point determined by the single-end travelling wave principle. The method has the advantages that: as the obtained distance measurement result is obtained by the single-end principle, the influence of the mixed line length error caused by the distance measurement adopting the double-end principle and the accurate time synchronization problem between the two sides of the line on the distance measurement accuracy is eliminated, thus the accuracy and reliability of the distance measurement are improved. Through the method, the fault distance measurement for the travelling wave of the power line is realized, and the reliability and accuracy of the travelling wave distance measurement are improved; and after the line fails, the fault point can be found without taking much time, the power supply reliability is improved, and the method has wide application prospects.
Owner:SHANDONG UNIV OF TECH

Power line three-dimensional reconstructing method based on airborne laser radar point cloud

The invention discloses a power line three-dimensional reconstructing method based on airborne laser radar point cloud. Data of the airborne laser radar point cloud have been correctly classified. The method includes the following steps: 1, loading the correctly-classified data of the airborne laser radar point cloud and initial line track data of an overhead transmission line; 2, extracting accurate information of the positions and the number of electric towers and the track of the power transmission line, and determining the total number of spans of the power transmission line; 3, determining the two-dimensional space range and power line laser radar points of each span of the power transmission line; 4, clustering the determined power line laser radar points of the spans; 5, carrying out power line three-dimensional reconstruction. According to the power line three-dimensional reconstructing method, the number of required parameters is small, the automation degree is high, robustness and universality are better, and the power line three-dimensional reconstructing method has the advantage of being insensitive to the factors such as the number of power lines, the types of the power lines, the power line space arrangement structure, gross error points, point-cloud irregular breaking and the line length; in addition, a reconstruction model has the high reconstruction accuracy.
Owner:CHINESE ACAD OF SURVEYING & MAPPING

Binning of results from loop qualification tests

The present invention provides a method and apparatus for performing line qualification tests, and binning the results of such testing. The lines are tested to determine or estimate various characteristics of the line. Physical characteristics of the line may be estimated (e.g. line length, line gauge, insertion loss). The presence of devices on the line such as load coils, bridged taps, terminations and the like may also be determined. A prediction of the data rate the loop can support is made from the measured and estimated line conditions. The results are binned according to certain criteria and to provide an easily discernable status of the line. The binning can be performed by a computer using software designed specifically for this purpose. The binned results may include a first category indicating the line cannot support a certain level of high speed access. The binned results may also include a second category indicating the line can support a certain level of high speed access. The results may also include a third category indicating the line cannot currently support a certain level of high speed access but would be able to upon removal of an impediment. A fourth category indicating the characteristics of the selected line fall outside the area of coverage of the test system may also be included. Each category may be assigned a respective color in order to make the status of the line easily discernable. The testing and binning may be performed for a variety of different high speed access levels. Customers can be charged different rates dependent upon the level of service made available to them.
Owner:TOLLGRADE COMM INC

Application of image mosaic technology in tunnel surrounding rock deformation noncontact measurement

The invention relates to an application of the image mosaic technology in tunnel surrounding rock deformation noncontact measurement, in particular to an application in noncontact measurement of tunnel large-size section surrounding rock deformation. The measurement method includes firstly, arranging points to be measured and image mosaic mark points on a large-size monitoring section, placing portable precise three-dimensional controlling fields in front of the large-size monitoring section, performing convergent photography by an ordinary digital camera to capture monitored section overlapping sub-image groups of the points to be measured, the image mosaic mark points and the controlling fields included during different periods, then carrying out distortion correction and high-precision mosaic to the images to acquire a panorama of the monitoring section; secondly, extracting image point coordinates of the points to be measured and the controlling points in the panorama by using the sub-pixel location technology, analyzing the spatial three-dimensional coordinates of the points to be measured by a direct linear transformation method, calculating the measuring line lengths among the points to be measured during the same period and the changes of the measuring line lengths among the points to be measured during different periods so as to acquire the displacement information. Accordingly, the accurate results of the tunnel large-size section surrounding rock deformation noncontact measurement can be realized.
Owner:63653 FORCES PLA

Combined traveling wave fault location method of high-voltage overhead line and cable hybrid line

The invention provides a combined traveling wave fault location method of a high-voltage overhead line and cable hybrid line. The method comprises the following steps of: firstly, carrying out fault section selection by using a double-ended principle according to time difference generated when a fault initial traveling wave of the hybrid line arrives at two ends, then carrying out initial fault location by using a single-ended principle, and finally working out an accurate result via the single-ended principle by combining with the time difference generated when the fault initial traveling wave arrives at two sides of the line. The method has the advantages that: the obtained fault location result is the result of the single-ended fault location principle, and the effects of hybrid line length error and accurate time synchronization problem of two sides of the line to the fault location accuracy are eliminated in the fault location by using the double-ended principle so that the accuracy and reliability of the fault location are improved. Therefore, the traveling wave fault location of the high-voltage overhead line and cable hybrid line is realized by using the method, the problem on how to accurately search a fault point position after the hybrid line is in the fault can be reliably solved and the traveling wave fault location method has a good application prospect.
Owner:SHANDONG UNIV OF TECH

A time sequence repairing method based on time headroom

The invention provides a time sequence repairing method based on time headroom, which comprises the following steps: step 1, extracting netlist information of all paths in a chip layout, and then entering a step 2; Step 2, determining a time sequence violation path in the generated static time sequence analysis and a corresponding time margin based on the configured time sequence constraint condition, and then entering a step 3; Step 3, judging whether the time margin is greater than a preset threshold value or not, if so, determining a starting point or an end point of a preset analysis pathin the time sequence violation path, and adjusting the magnitude of the clock delay of the time sequence violation path; Otherwise, analyzing based on the static time sequence; The method comprises the following steps: firstly, extracting logic units on a data path and a clock path according to a preset time sequence violation path, further extracting logic modules connected with the time sequenceviolation path and line network information of the logic modules, adjusting the line length between the logic modules connected with the time sequence violation path, performing optimized layout according to the optimized line length, and then returning to the step 1. The design area of the chip is reduced, and the working frequency of the chip is improved.
Owner:AMICRO SEMICON CORP

Distribution network fault line selection method based on zero sequence current variable quantity waveform correlation coefficient matrix

The invention discloses a distribution network fault line selection method based on a zero sequence current variable quantity waveform correlation coefficient matrix. According to the distribution network fault line selection method disclosed by the invention, a row off-diagonal element of each feeder zero sequence current variable quantity waveform correlation coefficient matrix and feeders in minimum corresponding before and after switching of a parallel resistance are utilized to carry out line selection for a fault line principle; and zero sequence voltage of a distribution network bus is larger than 15% phase voltage, the parallel resistance is switched by keeping arc suppression coil parameters invariable, a zero sequence current sampling value of each feeder flowing before and after switching of the parallel resistance is measured, the zero sequence current variable quantity waveform correlation coefficient matrix is further calculated, and the row off-diagonal element of each feeder zero sequence current variable quantity waveform correlation coefficient matrix and the feeders in minimum corresponding are selected as fault lines. With the adoption of the method, a line selection result is not influenced by factors such as transition resistance, line parameters, line length, distribution network running mode and fault position, the line selection principle is simple, and the line selection result is high in reliability and strong in practicability.
Owner:STATE GRID CORP OF CHINA +2
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