Method and device for locating fault on direct current grounding electrode circuit

Abstract

The invention discloses a method and device for locating a fault on a direct current grounding electrode circuit. The method for locating the fault comprises the steps that a plurality of voltage sampling values and a plurality of current sampling values , corresponding to a plurality of preset sampling times, of the direct current grounding electrode circuit are obtained from the measuring points of the direct current grounding electrode circuit; a forward voltage traveling wave function and a backward voltage traveling wave function are obtained in a calculating mode; mathematical morphology gradient transformation is carried out to obtain a forward traveling wave gradient function and a backward traveling wave gradient function; the reflected wave of a fault point is confirmed through the forward traveling wave gradient function and the backward traveling wave gradient function; the time corresponding to the reflected wave of the fault point is used as fault time, and a fault distance is confirmed according to the fault time. The upper edge or the lower edge or the signal saltation point of transient signals can be extracted well, and therefore the reflected wave of the fault point can be distinguished accurately. Therefore, the accurate fault time can be obtained, and the accuracy of the fault distance can be greatly improved.

Description

technical field [0001] The invention relates to the related technical field of DC grounding pole lines, in particular to a fault location method and device on a DC grounding pole line. Background technique [0002] At present, the grounding electrode line fault location methods at home and abroad mainly include current differential method, impedance method and traveling wave method. Because the current differential method and impedance method cannot distinguish the fault type, it is easy to cause misjudgment, so the application in fault location is restricted. limit. Using the transient traveling wave signal of the fault point can realize accurate and reliable fault distance measurement, and it is not affected by the fault type and fault distance, so it has been widely used. The fault location technology based on the traveling wave principle has been preliminarily studied in the fault location of the ground electrode line, and the single-ended traveling wave fault location ...

AI Technical Summary

Problems solved by technology

[0011] Based on this, it is necessary to provide a method and device for fault location on a DC grounding line in view of the technical problem that the fault location on the DC grounding line in the prior art cannot remove interference, resulting in inaccurate measurement

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