Method and device for determining line fault type

Abstract

The invention discloses a method and a device for determining a line fault type. The method comprises the following steps that: a first judgment result is determined according to the polarity of an initial traveling wave of a to-be-protected line; a second judgment result is determined according to the amplitude of the initial traveling wave of the to-be-protected line, wherein the first judgmentresult and the second judgment result are used for indicating the fault type of the to-be-protected line, and the fault type comprises a fault occurring within a line segment corresponding to the to-be-protected line or a fault occurring outside the line segment corresponding to the to-be-protected line; and when the first judgment result is consistent with the second judgment result, the fault type indicated by the first judgment result and / or the second judgment result is taken as a target fault type of the to-be-protected line. According to the invention, the technical problems of inaccurate detection and incapability of clearly determining the type of the line fault in detection of the line fault based on the power frequency electric quantity in the prior art are solved.

Description

technical field [0001] The present application relates to the field of detecting line faults, in particular, to a method and device for determining the type of line faults. Background technique [0002] Due to the small inertia and fast control response speed of the DC system in the AC-DC hybrid distribution network (high frequency, generally 10kHz~500kHz), and the power electronic devices are controlled by high frequency, the external characteristics of the converter can be in milliseconds Therefore, when the operating state of the AC-DC system changes after a fault occurs, the external characteristics of the converter will also change. In related technologies, the detection circuit based on power frequency electrical quantity is generally used faults, and the sampling frequency of power frequency electrical quantities generally does not exceed 1kHz. Under this sampling frequency, the fault information generally extracted is actually the result of the joint action of the li...

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Problems solved by technology

[0004] The embodiment of the present application provides a method and device for determining the type of line fault, to at least solve the technical problems of inaccurate detection and inability to clearly determine the type of line fault due to detection of line faults based on power frequency electrical quantities in the related art

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