KEYWORDS: Mining, Power grids, Power supplies, Operating systems, Data processing, Relays, Design and modelling, Data transmission, Data communications, Technology
In recent years, with the continuous input of high-power mining and transportation equipment and the continuous increase of mining depth, the power grid structure becomes more and more complex, the relay protector parameters are difficult to set, and power supply safety accidents such as switch misoperation and skip tripping are easy to occur. Through hardware design and software design, the power monitoring substation based on uCOS is researched and developed, and the fault monitoring and early warning system of coal mine power grid is constructed to achieve the purpose of intelligent identification and monitoring and early warning of common faults of coal mine power grid.
In view of the phenomenon that the leakage current in the underground power grid fault is caused by the decrease or damage of the insulation of the AC distribution line to the ground, the UA level high-precision current sensor with zero magnetic flux current sensing technology is developed, and the harmonic analysis method with windows is adopted to effectively eliminate noise, thus ensuring the accuracy of data collection. The leakage current of underground electrical equipment is monitored in real time to realize the early warning of insulation failure.
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