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A low-voltage parallel arc fault detection device and method

An arc fault and paralleling technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of large harmonic content of power supply, complicated calculation process, difficult selection of thresholds, etc., and achieve the effect of avoiding interference.

Active Publication Date: 2017-07-04
ZHUHAI PILOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the power quality of the domestic power distribution system is worse than that of foreign countries, and the harmonic content in the power supply is large, it is difficult to select the threshold value, and the calculation process is relatively complicated and the cost is high

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  • A low-voltage parallel arc fault detection device and method
  • A low-voltage parallel arc fault detection device and method
  • A low-voltage parallel arc fault detection device and method

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Embodiment Construction

[0018] In order to better understand the technical solutions of the present invention, the embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] When a low-voltage parallel arc fault occurs, the arc current is characterized by a large current amplitude, but smaller than the short-circuit current, and the waveform is a non-complete sine wave, such as figure 2 shown. Therefore, parallel arcs can be effectively and accurately identified through the current magnitude and current waveform distortion characteristics. Among them, the characteristics of current distortion are: because a certain potential is required between the two electrodes of the arc to break down the gap between the electrodes, therefore, at the zero crossing point, the potential between the electrodes increases with the increase of the voltage, and the gap between the electrodes can be broken down. , the current rises sharply. In...

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Abstract

The invention discloses a detection device and a detection device method for low voltage parallel electric arc fault, the fault detection device comprises a current transformer, a differentiating circuit, a microprocessor, a power supply module connected with the microprocessor, a zero comparison circuit, a bias circuit, a rectifying circuit, a sound-light alarm, an RS485 communiaction circuit, a test key and a noise reduction key. The fault detection method monitors the electric current magnitude and the signal expressing the electric current distortion for effectively detecting parallel electric arc fault. The detection device and the detection device have the detection function, which cannot be realized by the existing protector and the interference of the nonlinear load can be effectively avoided.

Description

technical field [0001] The invention relates to an arc fault detection device and method. Background technique [0002] With the rapid development of social economy and the continuous improvement of the degree of electrification, the power consumption is also increasing, and the occurrence of electrical fire incidents is becoming more and more frequent, causing huge losses to people and property. Arc faults are a cause of electrical fires that have been recognized in recent years, and parallel arc faults are one of the main forms of arc faults. When a parallel arc occurs, it has a very high temperature and can quickly ignite the surrounding combustibles. The parallel arc current is smaller than the short-circuit current. Therefore, the traditional over-current detection device cannot effectively prevent electrical fires caused by arc faults. Since domestic research on arc faults is still in its infancy, it is particularly important to develop a device that can effectively ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R19/17
Inventor 吴其勇姚少军
Owner ZHUHAI PILOT TECH