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Cascaded arc fault detection method and special device for cascaded arc fault detection method

A series arc and fault detection technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of low reliability, easy to cause misjudgment, etc., and achieve the effect of improving defects

Inactive Publication Date: 2015-02-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a series arc fault detection method and its special device. The method analyzes the voltage waveform at both ends of the electrical appliance, and performs wavelet denoising processing on the signal, and uses the average difference after processing as the characteristic value of the arc to judge whether there is an arc fault, which overcomes the current technology that uses the method of extracting the current signal The arc fault detection method with mutation characteristics is not reliable, and it is easy to cause misjudgment defects

Method used

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  • Cascaded arc fault detection method and special device for cascaded arc fault detection method
  • Cascaded arc fault detection method and special device for cascaded arc fault detection method
  • Cascaded arc fault detection method and special device for cascaded arc fault detection method

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Embodiment 1

[0057] The composition of the special device of the series arc fault detection method of the present embodiment is as fact image 3 and Figure 4 Example shown. Among them, the AC voltage regulating power supply 13 is TDGC2-2KVA, the voltage sensor 15 in the series arc fault detection unit is a Hall voltage sensor of model CHV-200VS, and the current sensor 17 in the series arc fault detection unit is a Hall model of CHB-25NP current sensor.

[0058] Connect the load electrical appliance to the load interface 14 of the special device of the series arc fault detection method of this embodiment to detect the series arc fault. The operation steps of the device are: turn on the main circuit, and control the arc generation module through the stroke control module 16 11 Closure and separation of electrodes. If arcing does not occur, repeat operation.

[0059] The components involved in this embodiment are all obtained from commercial purchases.

Embodiment 2

[0061] Using the special device of the series arc fault detection method of Embodiment 1 to detect the series arc fault based on the voltage waveform of the electrical appliance, the specific steps are as follows:

[0062] The first step is to collect the instantaneous value of the voltage across the electrical appliance:

[0063] Collect 400 instantaneous values ​​of the voltage at both ends of the electrical appliance with a sampling frequency of 20kHz in one power cycle, and use them as reference data for the next power cycle. While collecting the instantaneous voltage at both ends of the electrical appliance, collect the corresponding instantaneous value of arc ;

[0064] In the second step, the voltage waveform difference signal of adjacent power supply cycles is obtained:

[0065] Collect the same number of instantaneous values ​​of the voltage across the electrical appliances in the adjacent power cycle with the same sampling frequency, and then subtract them from the ...

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Abstract

The invention discloses a cascaded arc fault detection method and a special device for the cascaded arc fault detection method and relates to electrical fault detection devices. The cascaded arc fault detection method is based on a voltage waveform of an electric appliance, the voltage across the two ends of the electric appliance is used as a detection object, a difference mean value method is adopted to analyze the waveform of the voltage across the two ends of the electric appliance, and signals are subjected to wavelet noise reduction; a difference mean value obtained after processing is used as a characteristic quantity of an arc, and whether an arc fault happens is judged according to the characteristic quantity. The special device for the cascaded arc fault detection method comprises a cascaded arc fault simulation test unit and a cascaded arc fault detection unit. The cascaded arc fault detection method and the special device for the cascaded arc fault detection method overcome the defects that in the prior art, by the adoption of the arc fault detection method of extracting sudden change characteristics of current signals, the reliability is not high, and a misjudgment is easily made.

Description

technical field [0001] The technical solution of the invention relates to a detection device for electrical faults, specifically a series arc fault detection method and a special device thereof. Background technique [0002] In real life, continuous or intermittent arc faults can be caused by various reasons such as line aging. The characteristics of arc faults are manifested in physical phenomena as continuous and strong arc light, arc sound, heat release, etc., and in line current, it is manifested as distortion of current waveform, correspondingly there will be zero break interval, increased current rise rate, high frequency Harmonic increase etc. When arc burns, local high temperature will be generated. Arc fault is one of the main causes of electrical fire, which seriously threatens the safety of human life and property. [0003] Arc faults are divided into series arc faults and parallel arc faults. Series arc faults are greatly affected by the type and size of the lo...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/02G01R19/165
Inventor 张冠英孙莹季弘历张晓亮张涛李长伟曹旺林
Owner HEBEI UNIV OF TECH
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