Method for judging DC series arc fault based on frequency domain sage specific value

A series arc, phased technology, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve the problems of inability to meet real-time detection requirements, misjudgment and missed judgment of detection methods, and meet real-time detection requirements. requirements, overcoming the effects of misjudgment

Active Publication Date: 2019-11-12
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing DC series arc fault detection method is prone to misjudgment, missed judgment, a

Method used

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  • Method for judging DC series arc fault based on frequency domain sage specific value
  • Method for judging DC series arc fault based on frequency domain sage specific value
  • Method for judging DC series arc fault based on frequency domain sage specific value

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[0043] Attached below Figure 1~2 , The method of the present invention is described in detail.

[0044] 1) Real-time acquisition of the loop current value of the DC power supply system, and calculation of the loop current spectrum through the fast Fourier transform algorithm, a single acquisition of 4096 data points, the sampling frequency is 100kHz.

[0045] 2) After a single acquisition, calculate the loop current spectrum waveform, and divide the DC series arc current spectrum waveform into 12 different frequency segments.

[0046] 3) Among the 12 different frequency bands, each frequency band contains many frequency points. The amplitudes of the frequency points contained in each frequency band are respectively added to obtain the sum of the amplitudes corresponding to each frequency band. The sum of the amplitudes of each frequency band is respectively denoted as sum1~sum12.

[0047] 4) Real-time calculation of four groups of characteristic values ​​for resistance load and moto...

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Abstract

The invention discloses a method for judging DC series arc fault based on a frequency domain sage specific value, and belongs to the technical field of the DC arc fault detection. The method comprisesthe following steps: computing amplitude sum of each of 12 frequency bands in a DC power supply loop current spectrum, forming six groups of specific value relations as characteristic values Rarc1-Rarc4, S_Rarc1, S_Rarc2, and finding out the maximum amplitude in 51 points from the 75th to the 125th in the loop current spectrum, and computing the specific value of the 50 times of the maximum valueto other 50 points, and serving the specific value as the characteristic value E. when a threshold condition is satisfied twice or more in quartic data collection cycles of seven groups of characteristic values, the DC series arc fault in the DC power supply system can be confirmed. The method disclosed by the invention can be applied to the DC series arc fault detection in the DC power supply system.

Description

technical field [0001] The invention belongs to the technical field of DC arc fault detection, and in particular relates to a method for judging DC series arc faults. Background technique [0002] Since the DC series fault arc current has no zero-crossing point, it is difficult to extinguish automatically, and the arc temperature is very high. If such arc faults cannot be detected in time, it may cause damage to the DC power supply system and personnel safety issues. Arc involves many fields such as electricity, magnetism, heat, etc. The physical process is complex, and a lot of assumptions and simplifications are required in the modeling process, which will seriously weaken the accuracy and credibility of the simulation. At present, there is no precise mathematical physical model description arcing process. In the DC series arc fault detection, the analysis of the characteristic parameters before and after the DC arc fault is more important than the characteristics of the ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 周学周雨馨白天宇翟国富
Owner HARBIN INST OF TECH
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