Line branch identification method based on current harmonic spectrum

Abstract

The invention provides a line branch identification method based on a current harmonic spectrum. The line branch identification method is used for identifying whether a line branch belongs to a certain outgoing line of an upper-level node or not. According to the line branch identification method based on the current harmonics, whether a point to be measured and a reference point belong to the same line branch is identified according to whether the distance exceeds a preset threshold by measuring the current harmonic spectrums of the reference point and the point to be measured of the branch line and calculating the distance. The line branch identification device based on the current harmonic spectrum is composed of a split core type current transformer, an AD acquisition module, a main processing module, a communication module and a display module, the current harmonic spectrums of the reference points and the measured points of all branches are measured respectively, branch identification is carried out, and topology identification of the line branches of an area to which the branches belong is completed. The method adopts non-intrusive measurement, and does not influence the operation of the system; and meanwhile, due to the adoption of the current harmonic spectrums, the reliability and accuracy are ensured.

Description

technical field

[0001] The invention belongs to the technical field of power transmission and distribution in a power system, in particular to a line branch identification method based on a current harmonic graph. Background technique

[0002] The line branch referred to in the present invention refers to the topological path of the line from the power supply or transformer output side to each next-level transformer or load, especially refers to each topological branch (platform area) between the low-voltage transformer and the user meter. - phase-branch-household relationship). The branch identification referred to in the present invention is to confirm the one-to-one correspondence between the outgoing line of the upper branch node and the line to be tested (especially the incoming line of the lower branch node).

[0003] Since the locations where line branches appear are mainly feeder outlets, T junctions, branch poles, distribution boxes, etc., the identification object...

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