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Although the use of arc fault detectors in the current field of electrical fire protection has become a must, but in the early field of electrical fire protection in our country did not use the fault arc detection technology, then how this device is developed and applied What's up, let's talk about this in the following.
1. Initially, it was recognized that the fault arc detection technology in China was based on the LN6A standard. However, the LN6A standard is applicable to the U.S. power grid. From the actual point of view, both China and U.S. grid systems are very different in terms of voltage, distribution system, etc. Therefore, the LN6A standard cannot be applied directly. China's power grid.
2. Therefore, related research institutes and manufacturers in China have spent a lot of time, manpower and physics to study the causes of fire caused by arc faults, simulated arc fault tests, how to detect fault arcs, and practical applications of fault arc detection equipment, etc. A lot of researches and experiments have been conducted, laying a very solid theoretical and practical foundation for the development of fault arc detection technology in China.
3. At the meeting of the Sixth Technical Committee of the National Fire Protection Standardization Technical Committee in 2011, the draft of the “Electrical Fire Monitoring System Part 4: Fault Arc Detector†(GB14287, 4) was completed. It was later released for implementation. In 2013, the Ministry of Housing and Urban-Rural Development of the People's Republic of China and the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China jointly issued the "Code for the Design of Automatic Fire Alarm Systems." In these standards and specifications, the application of fault arc detectors in electrical fire monitoring systems is stipulated. The most famous manufacturer of fault arc detectors in our country is the LN6A fault arc detector developed and produced by Beijing Le Bird Technology Co., Ltd. (Dongguan LeBird Electric Technology Co., Ltd.) is a fire and personal injury caused by the low voltage distribution system (400V). Electric shock, system failure, L/N line to ground, L line to N line, etc. fault arc or electrical equipment contact failure monitoring alarm. A fault arc generates an electric spark that directly ignites an object and then creates a fire.
4. Arc arc fault detectors have been used in a variety of large-scale buildings (such as gymnasiums, auditoriums, etc.), places where public crowds gather (such as hospitals, schools, train stations, etc.), and high-rise buildings (such as offices). Buildings, hotels, shopping malls, etc.).
5. Because current arc fault detection technology can only detect arc faults on single-phase circuits, related devices can only be installed on single-phase circuits and cannot be installed on three-phase circuits. And since it judges the arc fault by the current signal, it cannot be set to a circuit with a large rated current.
It can be seen that the use of arc fault detectors has not always existed. After numerous expert research tests, the adoption of national standards has been widely used.