Method for identifying traveling wave in initial reversed polarity direction

Abstract

The invention discloses a method for identifying a traveling wave in an initial reversed polarity direction. The method can be used for effectively identifying the wave head of the traveling wave in the initial reversed polarity direction under various conditions and is not influenced by factors such as the fault type, modulus transmission, modulus attenuation and the like. The method comprises the following steps of: 1, starting to carry out wave recording by traveling wave distance measuring equipment; 2, detecting a fault initial traveling wave, recording time t1 that the fault initial traveling wave reaches a home terminal of a measuring terminal and extracting a traveling signal in an interval of [0.2tMF+2tNF] after the fault initial traveling wave, wherein tMF and tNF respectively represent required time that the fault traveling wave is transmitted to the home terminal of the measuring terminal from a fault point and required time that the fault traveling wave is transmitted to an opposite terminal of the measuring terminal from the fault point; 3, actually measuring the values of Delta t1 and Delta t2 and discriminating the property of the traveling wave in the initial reversed polarity by a criterion on the basis of a formula that Delta t1 / Delta t2=f(LMF); 4, if a special point is generated, identifying the special point by a criterion on the basis of function features between the Delta t1 and a fault distance; and 5, if an extreme case is generated in the step (4), combining an actual wave-recording line and zero mode component attenuation law to carry out further judgment.

Description

technical field [0001] The invention relates to a method for identifying traveling waves in an initial reverse polarity direction. Background technique [0002] Transmission line traveling wave fault location technology has been greatly developed and reached the level of commercialization, and has obtained a certain range of applications at home and abroad. Single-ended traveling wave fault location has low investment cost, does not require GPS system and double-ended communication, and is not affected by factors such as asynchronous startup of the double-ended hardware system and inconsistent time. It has a series of advantages. At the same time, due to the different management units of the plants and stations at both ends of the transmission line, it is inevitable to rely on the single-ended ranging method. For this reason, strengthening the understanding of single-ended traveling wave signals, mining the rich fault information it contains, and enhancing the extraction of...

AI Technical Summary

Problems solved by technology

Literature [1-3] conducted an in-depth analysis of the various influencing factors of transmission lines in the process of traveling wave propagation, and understood the phenomenon of dispersion of traveling wave modulus; Literature [4] analyzed the catadioptric The characteristics are analyzed, and the corresponding waveform identification method is proposed by using the initial reflection polarity of the voltage traveling wave at the distributed capacitance of the bus, but whether the initial reflection wave can be accurately measured on site will be the key to the successful application of this method

Literature [5] analyzed the polarity relationship between the fault initial traveling wave and the second wave head in the single-ended traveling wave signal, and used the polarity identification method to judge the nature of the second wave head, but the polarity relationship The establishment of the busbar is limited by the type of busbar; literature [6, 7] proposed a corresponding identification method using the refraction of the modulus, but the appearance of the zero-mode component is related to the fault type, and this method cannot be used for non-ground faults; at the same time The zero-mode component attenuates the most during the propagation process, and the reliability of the judgment method using the zero-mode component may be low

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