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Household appliance and arc fault detection device and method therefor

A fault arc and home appliance technology, applied in measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as equipment malfunction, damage, flat shoulders in current waveforms, etc., to reduce impact and prevent malfunction.

Active Publication Date: 2019-01-29
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Household appliance and arc fault detection device and method therefor
  • Household appliance and arc fault detection device and method therefor
  • Household appliance and arc fault detection device and method therefor

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Embodiment Construction

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0033] The arc fault detection device for household electrical appliances, the arc fault detection method for household electrical appliances and the household electrical appliances with the arc fault detection device according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0034] figure 1 It is a circuit block diagram of an arc fault detection device for household electrical appliances according to an embodiment of the present invention. Such as figure 1 As sh...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/12
CPCG01R31/00G01R31/12
Inventor 麦智炜王碧滢阮兆忠
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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