Power distribution network single-phase earth fault detection method and system

Abstract

The invention relates to a power distribution network single-phase earth fault detection method and system. The power distribution network single-phase earth fault detection method comprises steps that S1, a plurality of detection devices send detected three-phase current sampling data to a detection collection terminal, and the detection collection terminal filters all the three-phase current sampling data; and S2, the detection collection terminal calculates three-phase abrupt change current effective values and three groups of correlation coefficients between every two phase lines accordingto the three-phase current sampling data sent by each detection device. The metod is advantaged in that the single-phase earth fault identification is carried out based on three-phase current sampling data, the single-phase earth fault detection method provided by the invention does not need to additionally acquire a zero-sequence voltage signal, improves fault detection efficiency, is convenientand quick in configuration of the detection topology, even does not need to update hardware equipment, can finish updating only by replacing the detection method with the single-phase earth fault detection method provided by the invention, and has great progress.

Description

technical field [0001] The invention relates to the field of distribution network detection, in particular to a method and system for detecting a single-phase ground fault in a distribution network. Background technique [0002] As a clean and efficient secondary energy source, electric energy is closely related to national economic construction and people's daily life, and the power system that collects electric energy production, transmission, distribution and consumption, as a pillar industry of the national economy and people's livelihood, is very important to all walks of life. With the progress of modern society, the rapid development of economy and the sharp increase of power load, higher and higher requirements are put forward for the reliability, stability, safety and quality of power system. [0003] my country's distribution network mainly adopts the low-current grounding method. For single-phase grounding faults, since the line voltage between the three phases is...

AI Technical Summary

Problems solved by technology

The online monitoring method and system for power grid distribution line faults provided by this application realize the online monitoring of power grid distribution line faults, but a single detection device is still required to detect multiple data, increasing the amount of calculation, which will affect the recognition accuracy

[0008] Therefore, there are deficiencies in the identification of single-phase-to-ground faults in the existing distribution network, which needs to be improved and improved.

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