Fault electric arc judgment system for low-voltage line and judgment method thereof
A technology for arc faults and low-voltage lines, which is applied in the electrical field, can solve problems such as misoperation, insufficient effectiveness of fault arc judgment technology, and misjudgment of actions to achieve the effect of avoiding misjudgment
Active Publication Date: 2013-10-30
GUANGDONG YADA ELECTRONICS
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Problems solved by technology
[0002] Electrical safety in low-voltage lines cannot be ignored. At present, protection products and technologies for overcurrent and leakage problems have been widely used. Products and technologies for fault arc problems are still in their infancy in China, and many companies have launched various faults on the market. Arc circuit breaker products, but the common problem is misoperation, that is, misjudgment occurs in the case of non-fault arc, the main reason is that the judgment technology for fault arc is not effective enough
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[0020] The gist of the present invention is to overcome the deficiencies of the prior art, and provide a fault arc judgment system for low-voltage lines and its judgment method, which is composed of a circuit part and a software part. The circuit part samples and processes the voltage and current in the line and Input to the microprocessor, the software part of the microprocessor judges the characteristics of the fault arc, and then gives the signal of whether the fault arc occurs or not, and at the same time filters out the characteristics of the non-fault arc, thus effectively avoiding the fault. Misjudgment of fault arc. It is suitable for the design and manufacture of fault arc circuit breakers or electrical fire alarm devices, and the technology is novel and has broad application prospects.
[0021] The following will describe in detail with reference to the accompanying drawings in conjunction with the embodiments, so as to further explain the technical features and adva...
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The invention discloses a fault electric arc judgment system for a low-voltage line and a judgment method thereof. The system comprises a load loop, a voltage sampling circuit connected at the output end of the load loop, and a current sampling circuit, wherein the output end of the voltage sampling circuit and the output end of the current sampling circuit are respectively connected with the input end of a microprocessor. The voltage sampling circuit detects the voltage of the load loop and transmits a sampling value to the microprocessor, and the current sampling circuit is used for detecting the current of the load loop, and transmitting a sampling value to the microprocessor. The microprocessor conducts judgment according to current characteristics of the system in the load loop, when the microprocessor detects that a certain semi-cycle wave of the current disappears, and the result obtained by the mode that the unsteady load characteristic is subtracted from the steady-state load characteristic is a certain reserved resistive difference value section, the judgment on whether a fault electric arc occurs or not is carried out, and the output of the switching value is controlled so as to inform whether the fault electric arc occurs or not. Meanwhile, filtering is carried out on the character of a non-fault electric arc, and the misjudgment on the fault electric arc is effectively avoided.
Description
technical field [0001] The invention relates to the field of electrical technology, in particular to a fault arc judging system and judging method for low-voltage lines. Background technique [0002] Electrical safety in low-voltage lines cannot be ignored. At present, protection products and technologies for overcurrent and leakage problems have been widely used. Products and technologies for fault arc problems are still in their infancy in China, and many companies have launched various faults on the market. Arc circuit breaker products, but the common problem is misoperation, that is, misjudgment occurs in the case of non-fault arcs. The main reason is that the judgment technology for fault arcs is not effective enough. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a fault arc judgment system and its judgment method for low-voltage lines, which can quickly make a judgment when a faul...
Claims
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IPC IPC(8): G01R31/08
Inventor 汤晓宇
Owner GUANGDONG YADA ELECTRONICS