Ineffective time point eliminating method based on experiential wave velocity
A time-point and wave-velocity technology, applied to measuring devices, instruments, measuring electronics, etc., to achieve the effect of high accuracy and simple principle
Inactive Publication Date: 2016-10-12
KUNMING UNIV OF SCI & TECH
View PDF5 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The technical problem to be solved in the present invention is to propose a method for eliminating invalid time points based on multi-measuring point wave arrival time information for the problem of invalid detection point clocks in multi-measuring point DC line traveling wave fault location
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0027] Example 1: 9 detection points are randomly set on a DC transmission line with a total length of 1500km. The total length of the line is divided into 8 sections, and the lengths of each section are: 500km, 200km, 100km, 200km, 150km, 50km , 100km, 200km, the fault location is located at the detection point M 4 and M 5 between, and the distance M 4 At 50km from the detection point, the grounding resistance is 50Ω, the fault time is 0.5s, and the sampling rate is 1MHz. The line-mode current traveling wave data of the M and N terminals and each detection point in the time window of 0.5-0.505s are selected. will detect point M 3 The time scale of 150μs is set to simulate its clock error.
[0028] The first step, current traveling wave data acquisition: a total of 9 detection points are arranged along the positive and negative lines of the DC transmission line with a total length of 1500km. When a ground fault occurs on a DC transmission line, the line-mode current is cal...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to an ineffective time point eliminating method based on an experiential wave velocity, and belongs to the technical field of power system fault distance measurement. The method comprises the steps: setting a plurality of detection points along a DC transmission line; firstly calculating a line mode current according the electrode current traveling wave data collected by the detection points when a fault happens to the DC transmission line, detecting a fault initial traveling wave through Wavelet Transform, and marking the moments when the fault initial traveling wave reaches the detection points; secondly respectively calculating the wave velocities through employing the wave arrival moments of all detection points and all section lengths, drawing and calculating the difference between the wave velocity and the experiential wave velocity through employing a deviation degree, judging that the moments are effective moments if the deviation degree is smaller than a threshold value, or else, judging that the moments are ineffective moments. The method carries out the removing of the ineffective time points through employing the wave arrival moments of the plurality of detection points, is not affected by waveform and other factors, is simple in principle, and is reliable and effective.
Description
technical field [0001] The invention relates to a method for eliminating invalid time points based on empirical wave velocity, and belongs to the technical field of power system fault distance measurement. Background technique [0002] Existing traveling wave location methods only use fault traveling wave information of one transmission line for location calculation. Double-ended traveling wave fault location requires strict synchronization of clocks on both sides, and fault location is performed by using the arrival time of the first wave head of the fault on both sides. However, in actual engineering, it cannot be guaranteed that all detection devices are started correctly. Factors such as GPS timing equipment from different manufacturers, bad weather, and the inherent instability of GPS receiving signals will cause the clocks recorded at each measuring point to be out of sync, and even the time scale will not be correct. Calibration and other issues, the clock error intro...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 田鑫萃束洪春白冰
Owner KUNMING UNIV OF SCI & TECH