Fault recorder utilizing travelling wave fault location algorithm

Abstract

The invention relates to fault recorder utilizing a travelling wave fault location algorithm. The fault recorder utilizing the travelling wave fault location algorithm comprises a voltage transmitter, a current transmitter, a wave recording access unit, a fault wave recording unit, a travelling wave fault location unit, and a central processing unit (CPU) plugin. The voltage transmitter can convert input voltage signals in an electric system into analogue voltage signals. The current transmitter converts input current signals in the electric system into two path analogue current signals. The wave recoding access unit converts the analogue voltage signals and the analogue current signals into digital voltage signals and digital current signals and the like. The fault wave recording unit samples the digital voltage signals and the digital current signals and the like. The travelling wave fault location unit converts the analogue current signals analog to digital (A / D) into high-speed digital current signals and the like. The CPU plugin receives traveling wave data and wave recording data and calculates a fault location according to the traveling wave data and wave recording. The fault recorder utilizing the travelling wave fault location algorithm can integrate fault recording and travelling wave fault location. Hardware investment of electric system high voltage transmission lines is reduced and time of repairing faults can be shortened.

Description

technical field [0001] The invention relates to a fault recorder of a power system, in particular to a fault recorder using a traveling wave ranging algorithm. Background technique [0002] At present, the fault recorders used in power systems all have traditional single-ended and double-ended ranging functions. The principle of this ranging is the impedance method, but the impedance method has accuracy problems, and their errors mainly come from The assumption of the algorithm itself is that the ranging accuracy is deeply affected by the transition resistance of the fault point. Only when the transition resistance of the fault point is zero can the distance of the fault point be calculated accurately. Moreover, due to the incomplete symmetry of the line in the actual system and the unknowable impedance value of the measurement end-to-side system, the ranging error is often much larger than the error standard given by some fault location products under ideal conditions. [...

AI Technical Summary

Problems solved by technology

[0003] From the principle point of view, compared with the impedance method, traveling wave ranging is hardly affected by factors such as transition resistance and line asymmetry, and its accuracy is better than that of the impedance method; Identify the reflected wave area, and the near end is just the section where the impedance method is more accurate.

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