Based On Plc Mining Flameproof High Vacuum Switchgear's Control System

With the full automation of the implementation of the mine, in order to improve production efficiency, reduce costs, the mine began unmanned substation. Mine explosion-proof high voltage vacuum feed distribution device is coal mine power important equipment. At present the technical performance of domestic products can not meet the requirements of the development of production, while the introduction of foreign investment has too much product. Therefore, the development of high reliability, mining explosion-proof intelligent high voltage vacuum distribution equipment is the situation.Control systems are high-pressure mine explosion-proof vacuum distribution equipment in the core and critical part of its pros and cons of the decision of the mine explosion-proof high voltage vacuum distribution equipment the pros and cons. The topic of measurement and control system design functions performed by the power supply system in the event of overload, short circuit, phase loss, over voltage, under voltage, leakage, failure to protect cable insulation, and there are wind power and electric locking feature degree of functionality.The subject of the control system controller is used in harsh industrial environments for programmable controllers; programmable controllers are used LG's Master-K120S series. Human-computer screen LS programmable monitor is the XGT series. In order to ensure the accuracy of this system, voltage, current, zero sequence voltage, zero sequence current of analog processing with a precision rectifier circuit. For high-pressure explosion proof vacuum distribution equipment to achieve selective leakage protection function first using PLC-based high-speed counter determine the direction of the zero sequence current theory, the application of the theory of the system greatly improved the accuracy of the leakage protection. Some degree for the electric system adopts the excellent degree of specialized electronic chip BL0952.In order to improve anti-interference performance, the subject of the voltage sampling circuit, the phase current sampling circuit, processing circuit zero sequence voltage, zero sequence current processing circuit and other parts separately grounded to reduce interference between the various parts. Which voltage sampling circuit, the phase current and zero sequence voltage sampling circuit processing circuit, zero sequence current processing circuit and electronic circuits and power supply independence, which to some extent, it reduces the interference between them. In order to further enhance the anti-jamming performance, the subject of the voltage, the phase current, zero sequence voltage, zero sequence current sampling using the active filter circuit.For this task all the parts involved, I have personally had to debug and modify, after repeated efforts to finally make high-voltage vacuum distribution equipment for mining the electrical function meets and exceeds the requirements of national standards, in particular leakage part of the innovation in coal mine neutral non-selective protection grounding system provides new methods and ideas, and have achieved good results.Believe that the issue of the design of the mine explosion-proof high voltage vacuum distribution equipment for monitoring and control system fully satisfies the needs of practical applications and have a good market prospects.