Method and device for calculating time difference between incident wave and reflected wave in traveling wave method positioning

Abstract

The invention provides a method for calculating a time difference between an incident wave and a reflected wave in traveling wave method positioning. The method comprises the steps of: generating a pattern of sampling points from characteristic parameters for positioning; setting a waveform corresponding to a wave crest in the pattern as an incident pulse, and then searching for a waveform matching with the incident pulse in the pattern; and calculating the time difference between the incident wave and the reflected wave according to the matched waveform and the incident pulse. Furthermore, the invention provides a device for calculating the time difference between the incident wave and the reflected wave in the traveling wave method positioning. By means of the technology provided by the invention, the time difference which exists between the incident wave and the reflected wave and is needed in single-ended traveling wave method positioning is calculated; the result of a parameter value of the obtained time difference is more accurate; automatic calculation is realized in the entire process, and the incident wave and the reflected wave are unnecessary to calibrate by a tester depending on experience and intuition, so that a worker can judge conveniently; the economic loss caused by human errors is avoided; and the cost of manpower consumption is lowered.

Description

technical field [0001] The invention relates to a partial discharge detection technology of electric power cables, in particular to a method and a device for calculating the time difference between an incident wave and a reflected wave in positioning by a traveling wave method. Background technique [0002] Transmission lines, such as power cables and optical fibers, will show varying degrees of changes in physical properties when faults occur. The purpose of measuring the fault point of the transmission line is first to understand the characteristics of the transmission line when it is in normal use, and compare it with the characteristic value in the current operating state. The second is to find out the fault point if an abnormal situation is found. location of . For the transmission line in operation, the part with severe discharge can be replaced to ensure the safe operation of the line; if a serious defect is found in a certain section of the transmission medium being...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method and device for calculating the time difference between the incident wave and the reflected wave in the positioning of the traveling wave method, which solves the problem of accurate results of the time difference between the calculated incident wave and the reflected wave in the positioning process of the current single-ended traveling wave method lower sex problems

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