An integrated transmission line protection and traveling wave ranging method

Abstract

The invention discloses an integrated transmission line protection and traveling wave distance measurement method. Through a protection DSP unit starting criterion and traveling wave DSP unit starting combination, the frequent false starting of traveling wave distance measurement is effectively reduced, through dividing a high speed cache unit into four cache sub units to store traveling wave distance measurement data in a circulated way and timely storing the traveling wave distance measurement data of each time to a data storage device, thus the multiple times of traveling wave distance measurement data with near initiation intervals are not covered, a problem of data coverage or loss caused by frequent starting is effectively solved, through a mode of setting two types of extraction sampling units, the precision of protecting DSP sampling is improved, the fault distance measurement precision of a transmission line is improved, at the same time station resources are saved, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of transmission line protection, in particular to an integrated transmission line protection and traveling wave ranging method. Background technique [0002] For a long time, fault location of high-voltage transmission lines has been widely valued. Accurate positioning of high-voltage transmission line faults can shorten fault repair time, improve power supply reliability, and reduce power failure losses. At present, the distance measurement algorithm based on power frequency measurement for high-voltage transmission line protection is affected by many factors, resulting in large errors in distance measurement accuracy; traveling wave distance measurement has the characteristics of not being affected by system operation mode and CT saturation, etc., and can accurately locate line faults point, however, the separate traveling wave ranging device in the substation occupies the resources of the substation, and...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of frequent false starts in the prior art of traveling wave distance measuring devices. Frequent starts often miss or wash out real fault data records, which brings a lot of inconvenience to operation and maintenance.

The integrated transmission line protection and traveling wave ranging method of the present invention, through the combination of the protection DSP unit starting criterion and the traveling wave DSP unit starting, effectively reduces the frequent false start of traveling wave ranging, and effectively solves the data problem caused by frequent starting. The problem of being covered or lost has a good application prospect in improving the accuracy of transmission line fault location and saving resources in the station

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