Household electrical appliance and fault arc detection device and method used therefor

Abstract

The invention discloses a household electrical appliance and a fault arc detection device and method used therefor, wherein the fault arc detection device comprises a power grid current detection unit used for detecting the current flowing from a power grid into the household electrical appliance so as to generate a first current detection signal; a filtering protection unit used for carrying out attenuation processing on an arc signal in the power grid; a load current detection unit used for detecting the practical operation current of loads of the household electrical appliance so as to generate a second current detection signal; and a control unit, wherein the control unit is connected with the power grid current detection unit and the load current detection unit and is used for identifying and comparing the first current detection signal and the second current detection signal so as to determine the generation source of the fault arc. The fault arc detection device is capable of accurately determining the generation source of the fault arc, and false action is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a fault arc detection device for household appliances, a household appliance and a fault arc detection method for household appliances. Background technique [0002] Arc faults are dangerous and frequent electrical faults. Once the electrical lines and electrical equipment have been overloaded for a long time or have poor electrical connections, etc., the insulation layer will be aged or damaged, which may cause arc faults. When an arc fault occurs, only an arc current of 2-10A is enough to generate a local high temperature of 2000-4000°C in a short period of time. Therefore, an arc fault will bring serious safety hazards to electrical equipment. [0003] Among them, once a fault arc occurs in the electrical equipment, high-frequency noise of 200-400kHz will appear in the operating current waveform, and even some loads will cause the current waveform to appear flat ...

AI Technical Summary

Problems solved by technology

Once the electrical lines and electrical equipment have been overloaded for a long time or have poor electrical connections, etc., the insulation layer will be aged or damaged, which may cause arc faults

When an arc fault occurs, only an arc current of 2-10A is enough to generate a local high temperature of 2000-4000°C in a short period of time. Therefore, an arc fault will bring serious safety hazards to electrical equipment

[0003] Among them, once a fault arc occurs in the electrical equipment, high-frequency noise of 200-400kHz will appear in the operating current waveform, and even some loads will cause the current waveform to appear flat shoulders

The current mainstream detection method is to judge the fault arc by identifying the high-frequency component in the current waveform. However, once the fault arc phenomenon occurs in the equipment, the current waveform of the power grid near the equipment will have arc high-frequency noise, so it is difficult to judge the fault arc. The source of generation will cause other equipment in the grid to malfunction and cause inconvenience to users

Moreover, the current sampling circuit for sampling the current waveform not only has high cost, but also lacks real-time performance, reliability and accuracy.

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