A single-phase-to-ground fault detection algorithm for distribution network based on phase current similarity

Abstract

The patent of the present invention proposes a single-phase grounding fault detection algorithm for distribution network based on phase current similarity. Firstly, according to the three-phase current acquisition terminal installed in the distribution network, the current sampling data within td time before and after the single-phase grounding fault is obtained, and the current mutation sequence is synthesized. Due to the characteristics of low and high waveform similarity between the current abrupt changes on the load side near the fault point, the HD distance between the current abrupt changes of each acquisition terminal is calculated; the similarity of the current abrupt changes of the current acquisition terminals closest to the bus through each feeder Determine the faulty feeder; determine the location of the fault by the similarity of the current abrupt change of the current acquisition terminal of the faulty feeder, and determine that the acquisition terminal is located on the near-bus side or near the load side of the fault point; Realize fault phase selection. The method can avoid the influence caused by the branch line and the overhead mixed line of the cable, and has bootstrapping.

Description

technical field [0001] The invention relates to a single-phase grounding fault detection algorithm of distribution network based on phase current similarity. Background technique [0002] The existing single-phase grounding fault location methods for non-effectively grounded distribution networks can be divided into two categories according to the different information they use: one is the fault location method based on the external injection signal; the other is to use the electrical quantity at the fault moment. The fault segment location is based on the changing characteristics, which can be further divided into the fault segment location method based on the steady state component of the fault, the fault segment location method based on the fault transient component and the comprehensive information location method. According to practical application experience, the network structure of medium-voltage distribution network is complex, and there are many line branches. The...

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Problems solved by technology

Seriously affect the practicability of the traditional section location method based on the similarity of uploaded phase current and current characteristics

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