Arc fault detection method
A technology of arc fault and detection method, which is applied in the direction of testing circuits, electrical components, circuit devices, etc., can solve problems such as misjudgment or missed judgment, complex arc fault signals, etc., and achieve the effect of reducing the possibility of misjudgment or missed judgment
Active Publication Date: 2019-05-03
SEARI ELECTRIC TECH +1
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Problems solved by technology
However, the arc fault signal is more complicated, and its manifestation is similar to the working current in some complex load environments, so it is easy to cause misjudgment or missed judgment
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[0044] The characteristics of the fault arc caused by the arc fault not only exist in the line current, but also have some manifestations in the line voltage. Combining the current and voltage signals, the waveform characteristics of the fault arc can be obtained. And the real fault arc has randomness, and its characteristic points will randomly appear in any position of the waveform. However, the interference waveform or suspected waveform under a complex load environment is periodic, that is, the characteristic points of the suspected waveform are basically consistent in adjacent cycles, and the positions of the characteristic points are fixed and appear periodically. Whether it is random or not, real arc faults and suspected arc faults can be identified.
[0045] refer to figure 1 As shown, the present invention discloses an arc fault detection method, comprising the following steps:
[0046] 102. A data sampling step, performing data sampling according to a predetermine...
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The invention discloses an arc fault detection method, which comprises the steps of data sampling, sampled data preprocessing, sampled data processing and operation performing, and is characterized in that in the step of data sampling, data sampling is performed according to a predetermined sampling frequency and a predetermined sampling period; in the step of sampled data preprocessing, sampled data is preprocessed and stored; in the step of data processing, the preprocessed sampled data is processed, the fault type is pre-judged according to a processing result, a corresponding fault judgment subprogram is started, or tripping is instructed; and in the step of operation performing, a tripping operation is performed or the tripping operation is not performed according to the processing result of sampled data processing, if the tripping operation is performed, the entire arc fault detection method is ended, and if the tripping operation is not performed, the process returns back to the step of data sampling to continue data sampling and repeat the above process. The arc fault detection method can be applied to various complex load environments, can identify normal operating current and real arc fault signals under the complex load environment and reduce the possibility of misjudgment or missed judgment.
Description
technical field [0001] The invention relates to the field of low-voltage electrical appliances, and more specifically relates to arc fault detection technology. Background technique [0002] As electrification progresses, electrical wiring becomes an integral part of buildings. At the same time, accidents and losses caused by electrical failures are also increasing. In electrical faults, fire accidents caused by various types of arc faults account for the main proportion of electrical fault accidents. Electrical fire accidents pose an increasing threat to people's lives and property. [0003] Because the arc fault does not necessarily appear as an abnormal current, traditional electrical protection equipment, such as overcurrent protection devices and residual current protection devices, cannot detect and protect arc faults well, so they cannot be effective for accidents caused by arc faults protective effect. Therefore, the arc fault detection device, as a protective de...
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IPC IPC(8): H02H3/32G01R31/14
CPCG01R31/14H02H3/32
Inventor 潘东强付华施惠冬陈永亮葛伟骏
Owner SEARI ELECTRIC TECH