Single-end waveform automatic identification method for power transmission line traveling wave range finding

Abstract

The invention proposes a single-end waveform automatic identification method for power transmission line traveling wave range finding, which belongs to the electric automation field and is characterized by comprising the following steps: step a) identifying the faulty phase in which the range finding device installed on the bus terminal identifies the faulty phase based on the difference between the faulty waveforms and the healthy waveforms; step b) identifying the faulty waveforms in which the range finding device installed on the bus terminal obtains different waveforms of a faulty traveling wave; step c) obtaining the wave head pulse of the traveling wave; step d) obtaining the time difference between the initial traveling wave of the faulty point and the reflected wave pulse; and step e) calculating the faulty distance. Through single-end waveform automatic identification method for power transmission line traveling wave range finding of the invention, the power transmission line fault no longer relies on the manual manner, but instead, the computer automatically identifies the faulty waveform according to the waveforms after the power transmission line fault and calculates the distance from the faulty point to the measurement point.

Description

technical field [0001] The invention relates to a single-end waveform automatic identification method suitable for traveling wave ranging of transmission lines, which belongs to the field of electric power automation. Background technique [0002] After the transmission line is faulty, the current main ranging methods are impedance ranging and traveling wave ranging. In the protection and fault recording devices of the power system, the traveling wave ranging function based on the impedance method is integrated. However, affected by the line corridor, line structure and fault point resistance, the reliability of the impedance ranging method is low, the ranging error is large, and the relative error is required to be within 3%. However, in actual operation, the absolute ranging error is greater than the requirement, reaching A few kilometers, more than ten kilometers or even more, cannot guide the actual line fault quick finding requirements. [0003] As a technology develop...

AI Technical Summary

Problems solved by technology

[0004] At present, the traveling wave ranging technology mainly adopts two modes: the double-ended ranging technology based on the data and time synchronization of the line double-ended ranging device and the single-ended ranging technology based on the traveling wave ranging device at one end of the line. Based on the device and communication, the fault distance can be automatically calculated by the device; the latter can only be manually analyzed on the fault waveform data to obtain the fault distance

[0005] With the improvement of power system operation management level and power supply reliability requirements, the manual judgment of single-ended ranging technology can no longer meet the requirements of fast and intelligent ranging after transmission line faults. Single-ended line fault location

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