Non-invasive low-voltage fault arc detection and positioning method and system

Abstract

The invention discloses a non-invasive low-voltage fault arc detection and positioning system, which comprises eight functional modules; the modules comprise a standard electric appliance load characteristic library module, a fault arc characteristic fingerprint library module, a data acquisition and preprocessing module, a non-intrusive load identification module, a fault arc detection and identification module, a fault arc positioning module, a data information storage module and an external interaction and information visualization module; by utilizing the eight functional modules, a methodfor extracting fault arc current characteristics from the total load data is adopted, and the electric appliance running state obtained by the existing non-intrusive load identification technology iscombined to realize accurate fault arc positioning. Under the condition that the arc fault is detected, fault positioning is carried out, and through calculation of the positioning test effect, the positioning test effect, namely the positioning branch accuracy rate, achieved by the system reaches up to over 85%.

Description

technical field [0001] The invention relates to the field of fault arc monitoring in electric power systems, in particular to a non-invasive low-voltage fault arc detection and positioning method and system. Background technique [0002] According to statistics from the Fire Department of the Ministry of Public Security, in recent years, the proportion of electrical fires in fire accidents in my country has reached as high as 30%, ranking first among all types of fire causes, and showing an increasing trend year by year. Arc faults in low-voltage power users at the "end" of the power system due to line insulation aging, electrical switch action, etc. are easily overlooked, but once a fire occurs, the loss is immeasurable. Studies have shown that in electrical fires, the fire accidents caused by arc faults are far more than those caused by metallic short circuits between live conductors. Arc faults can be divided into parallel fault arcs and series fault arcs according to th...

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Problems solved by technology

According to existing research and products, in order to realize all-round monitoring and accurate positioning of the entire low-voltage power distribution system in the user's room, multiple monitoring terminals or functional modules need to be configured, and in actual engineering, there will be multiple power distribution branches in the low-voltage power distribution system. In addition to electrical sockets, fault arcs may also occur anywhere on the distribution branch, which brings challenges to system-level arc location, and the existing research rarely involves

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