Double-end ranging method capable of eliminating influence of wave velocities

A technology of double-end ranging and wave speed, applied in the fault location and other directions, can solve the problems of low monitoring sensitivity, low positioning accuracy, wave speed and line sag effects, etc., and achieve the effect of improving identification accuracy and double-end ranging accuracy.

Active Publication Date: 2019-06-18
SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV +1
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Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a double-terminal ranging method that eliminates the influence of wave velocity to solve the problems of low positioning accuracy, greater influence by wave velocity and line sag, and low monitoring sensitivity in current double-terminal traveling wave ranging. question

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  • Double-end ranging method capable of eliminating influence of wave velocities
  • Double-end ranging method capable of eliminating influence of wave velocities
  • Double-end ranging method capable of eliminating influence of wave velocities

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[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0035] The present invention proposes a double-terminal ranging method that eliminates the influence of wave velocity. By measuring the time difference between the fault trip waveform reaching the double-terminal distance measuring device and the time difference between the relay protection closing waveform reaching the double-terminal distance measuring device, the relationship between the fault location, the traveling wave velocity and A multivariate equation of line length from which the fault location is obtained. The fault wave head identification adopts the fitting intersection algorithm to calculate the precise time of wave heads at both ends. Compared with the traditional double-end fault location device using wavelet tran...

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Abstract

The invention discloses a double-end ranging method capable of eliminating the influence of wave velocities. According to the method, the time difference of the arrival of fault trip waveforms to a double-end ranging device and the time difference of the arrival of relay protection closing waveforms to the double-end ranging device are measured, multivariate equations concerning fault positions, traveling wave velocities and line lengths are established, and a fault location is solved according to the equation set; a fitting intersection algorithm is adopted for fault wave header recognition,the precise time of wave headers at two ends is calculated, such kind of algorithm is not affected by a wavelet basis function and decomposition scale and has high adaptability compared with a traditional algorithm in which a double-ended fault location device uses wavelet transformation to obtain a modulus maximum value. Compared with a traditional double-ended traveling wave fault location method which adopts fault tripping waveforms to realize fault location and ranging, the method of the present invention eliminates fault location errors caused by line impedance, traveling wave velocities,line sag and the like, and improves fault location accuracy.

Description

technical field [0001] The invention relates to a double-terminal ranging method, in particular to a double-terminal ranging method which eliminates the influence of wave velocity. Background technique [0002] Accurate fault location of transmission lines in the power system can reduce the burden of line inspection and shorten the time of fault repair, which is of great significance for improving the reliability of power supply and reducing power failure losses. [0003] As a new fault location technology, traveling wave distance measurement has the advantages of being less affected by system parameters, transition resistance, system operation mode and line load compared with the traditional impedance method, and has a good development prospect. The basic principle of the traveling wave ranging method is to use the time difference between the initial traveling wave and the reflected wave at the fault point to arrive at the measuring end, combined with the traveling wave vel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 欧阳勇邓长飞赵明鉥耿屹楠庄池杰曾嵘
Owner SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
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