Single-phase earth fault identification method based on phase space reconstruction and conductance characteristics

Abstract

The invention belongs to the technical field of power distribution networks, and discloses a single-phase earth fault identification method based on phase space reconstruction and conductance characteristics, which comprises the following steps: performing classification identification of arc-containing fault class and arc-free fault class and classification identification of earth type on a single-phase earth fault; performing phase trajectory reconstruction on zero-sequence currents of continuous multiple periods during a fault steady state period by using a phase space reconstruction theory; performing classification identification on arc-containing fault class and arc-free fault class by calculating the information dimension of a binary matrix corresponding to the phase trajectory andthe corresponding attractor area; and calculating the average resistance during the fault steady state period to obtain the conductance of a corresponding earth medium to perform classification identification on the earth types, thereby finishing the identification of the single-phase earth faults. The whole process has the advantages of simple structure, quick calculation and high accuracy, and the reaction rate of the power distribution network to the single-phase earth fault and the capability of processing the faults are improved.

Description

technical field [0001] The invention relates to the technical field of distribution networks, in particular to a single-phase ground fault identification method based on phase space reconstruction and conductance characteristics. Background technique [0002] my country's medium and low voltage distribution network is dominated by overhead lines, the structure of the line is complex, there are many branches, and it is prone to failure. According to statistics, during the operation of the power system, power outages caused by distribution network faults account for more than 95% of the total power outages, of which 70% are caused by single-phase ground faults or busbar faults. In order to realize the rapid isolation of distribution system faults and restore the normal operation of the distribution network system, it is necessary to accurately and quickly realize the fault location of the distribution network. At present, fault location mainly relies on manual line inspection...

AI Technical Summary

Problems solved by technology

[0015] The invention provides a single-phase ground fault identification method based on phase space reconstruction and conductance characteristics, which solves the problems of low reliability of the existing identification methods, which mainly rely on manual line inspection, and slow response speed, etc.

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