Fault arc monitoring system of low voltage electrical circuit

Abstract

The invention discloses a fault arc monitoring system of a low voltage electrical circuit. The fault arc monitoring system comprises a plurality of fault arc detecting nodes used for detecting voltageinformation and temperature information in the low voltage electrical circuit, a plurality of fault arc repeaters connected with the fault arc detecting nodes and used for positioning locations of fault arcs, a fault arc monitoring host connected with the fault arc repeaters, a central controller connected with the fault arc monitoring host, and a power switch connected with the central controller and used for controlling the turn-on or turn-off of the circuits of the fault arc detecting nodes and the fault arc repeaters. The fault arc monitoring system disclosed by the invention has the characteristics of high monitoring precision and high speed, and has a high promotion value and use value.

Description

technical field [0001] The invention relates to the technical field of low-voltage electric lines, in particular to a low-voltage electric line fault arc monitoring system. Background technique [0002] Arc is a phenomenon of free gas discharge, and it is also a kind of plasma. The arc on the line can be divided into two types, one is normal operation arc, called "good arc"; the other is fault arc, called "bad arc". ". "Good arc" refers to the arc generated by the rotation of the motor (such as electric drill, vacuum cleaner, etc.). Of course, the arc generated when people switch electrical appliances and plug in and out of electrical appliances also belongs to "good arc". "Bad arc" is the fault arc. The main hazard of the fault arc is fire. The high temperature and heat generated by the fault arc can easily ignite the line insulation layer and cause the line to catch fire. If there are combustible materials near the fault point, it is also very easy Ignite combustibles an...

AI Technical Summary

Problems solved by technology

[0003] Electrical fire accidents pose an increasing threat to people's lives and property. Since fault arcs do not necessarily appear as abnormal currents, traditional electrical protection equipment, such as overcurrent protection devices and residual current protection devices, are not very good for fault arcs. Therefore, it cannot effectively protect against accidents caused by arc faults. Therefore, the arc fault detection system, as a protective electrical device for detecting arc faults, has an irreplaceable role in preventing various accidents caused by arc faults.

[0004] In the actual power consumption environment, the frequent operation of the switch, the moment of plugging and unplugging, the existence of various complex loads in the line, and even poor or loose contact may lead to the occurrence of arc faults.

Arcing is an additional phenomenon of more serious arcing. On the one hand, when arcing occurs, the arc has been generated for a period of time, and the accident may have already occurred, which cannot prevent it; detected, but these relatively weak arcs can also cause arc fault accidents

[0005] A feasible arc fault detection method is realized through voltage and temperature detection, but the arc fault signal is more complicated, and its manifestation is similar to the working current in some complex load environments, so it is easy to cause misjudgment or missed judgment. How to accurately and effectively Identifying arc faults, and not being limited to a specific arc fault type, is desirable in the industry

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