Non-synchronous fault location method for half-wavelength transmission lines based on line-mode voltage traveling wave amplitude attenuation characteristics

Abstract

The present invention discloses a non-synchronous fault location method for a half-wavelength transmission line based on the amplitude attenuation characteristics of the line mode voltage traveling wave. Based on the attenuation law of the amplitude of the high frequency component when the line mode voltage traveling wave propagates on the half-wavelength transmission line, the non-synchronous fault location scheme for the half-wavelength transmission line combining the single-ended traveling wave distance measurement with the traveling wave attenuation characteristics is proposed. The main idea is to firstly estimate the fault location roughly after a fault occurs, and a corresponding fault distance measuring method is selected for location according to the attenuation degree of the amplitude of the line mode voltage traveling wave. The method combines the distance measurement principle based on the attenuation principle of the amplitude of the line mode voltage traveling mode and the single-end distance measurement principle to carry on half-wavelength transmission line fault location, and gives full play to the advantages of the two kinds of distance measurement methods. The method does not need precise synchronization of measuring points and has high engineering practical significance.

Description

technical field [0001] The invention relates to a half-wavelength transmission line fault location method utilizing the amplitude characteristics of the high-frequency component of the first wave head of the line-mode voltage. Background technique [0002] Half-wavelength AC transmission Half-wavelength AC transmission is an ultra-long-distance AC transmission method. Compared with conventional AC transmission, it has the advantages of no need to install reactive power compensation equipment, strong transmission capacity, and good economy. Due to the long transmission distance of the half-wavelength transmission line, the dispersion and attenuation of the traveling wave are significant after the fault occurs, so the traditional traveling wave ranging method has a large error. [0003] At present, there are mainly single-ended and double-ended methods for distance measurement of transmission line traveling waves. The single-ended method does not require synchronization, but n...

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Problems solved by technology

Regardless of the ranging method, if it is directly used for fault location on half-wavelength transmission lines, the error will be large (up to about 2%)

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