A current signal noise reduction method for arc fault diagnosis technology
A current signal, arc fault technology, applied in the direction of only measuring current, measuring current/voltage, measuring electricity, etc., can solve problems such as detection performance interference of arc fault detection system, and achieve widening the scope of application, improving sensitivity, and simple technical implementation. Effect
Active Publication Date: 2022-06-24
INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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Problems solved by technology
[0006] The main purpose of the present invention is to provide a current signal noise reduction method for arc fault diagnosis technology, aiming to solve the detection of high frequency noise in the current signal collected in the prior art to the multi-load circuit series fault arc detection system Technical problems with relatively large performance interference
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[0025] The present invention will be described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings, so as to further explain the technical features and advantages of the present invention.
[0026] Embodiments of the present invention provide a current signal noise reduction method for arc fault diagnosis technology, refer to figure 1 , figure 1 It is a schematic flowchart of the first embodiment of a current signal noise reduction method for arc fault diagnosis technology according to the present invention.
[0027] In this embodiment, the current signal noise reduction method for arc fault diagnosis technology includes the following steps:
[0028] Step S01: Collect the mains current at the user's incoming wiring.
[0029] It should be noted that the high-precision current mutual inductance coil is used to collect the current signal in the line at the sampling frequency of 1024kHz at the user's power distribution inlet. ...
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The invention relates to the field of electrical protection, and discloses a current signal noise reduction method for fault arc diagnosis technology, which includes: using a multi-load circuit series fault arc detection system to select a reference current, and filtering components of the reference current with a frequency less than 100 Hz Generate a noise signal in a higher frequency band, collect the main circuit current and calculate the suppression factor of each frequency of the main circuit current signal according to the energy distribution of the noise signal and the main circuit current signal in the frequency domain space, and compare the suppression factor with the frequency spectrum of the main circuit current signal Multiply the noise-reduced current spectrum, restore the noise-reduced current spectrum to a time-domain signal, complete the noise reduction processing of the current signal, and pass the noise-reduced current signal to the multi-load circuit series fault arc detection system, It is used to judge whether there is a fault arc in the line. Because the present invention well suppresses the influence of high-frequency band noise on the main circuit current, the reliability of the multi-load circuit series fault arc detection system is further improved.
Description
technical field [0001] The invention belongs to the field of electrical protection, relates to a fault arc detection method, in particular to a current signal noise reduction method for fault arc diagnosis technology. Background technique [0002] When there are hidden dangers such as poor contact at the connection point of the power supply and distribution system, damage or aging of the insulating layer caused by external forces, fault arcs are caused under the action of voltage and current. With a current of only 0.5A, the arc temperature can be as high as 2000 degrees Celsius or higher, and the voltage to maintain the stable combustion of the arc is only 20V. After the arc starts, it is difficult to extinguish, and the arc fault becomes the ignition source, which in turn causes a fire. [0003] For many years, arc fault detection in complex electrical environment has been an important topic in industry and scientific research. However, so far, there is no truly mature ar...
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IPC IPC(8): G01R23/16G01R23/165G01R19/00G01R31/12
CPCG01R23/16G01R23/165G01R19/0092G01R31/1272
Inventor 王文家陆守香
Owner INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA