Studying On The Power Realibility System For Mine Local Blower

It is a great subject that the wind stopping problem produced by power failure in the dig working face of coal mine, which will influence the coal mine safety. It could effectively prevent methane accumulation and avoid gas explosion accidents by improving the safety and reliability of local ventilation of the dig working face in coal mine system, then realizing the intrinsically safe of coal mine safety in production. But at the same time, it is impossible that avoiding all the faults for ventilator, line of power supply and switch and so on because the existing of adverse factors such as atrocious conditions, easier to dap of the power supply line, extrusion and drop of the equipments, so it could not avoid completely power fault and wind stopping phenomenon which will cause methane accumulation and gas explosion accidents in dig working face of coal mine.To solve the problem of underground tunneling face failure which is due to the power failure. The project design and develop a local ventilation system for heading face for emergency power outages. This system can ensure rapid recovery ventilation when the mine appears power fault and air cutting phenomenon, and also could ensure the lasting wind offering if the working face to avoid gas accumulation or explosion caused by the stopping of wind and electricity .The core part is flameproof Three-phase Emergency Power Supplied by 660V.It is used for offering electricity to meet the emergency stand-by ventilator. At the same time it could automatically supply emergency air when the normal air supply system stops and offering the electricity to ensue safety and stable operation of production process.The main research contents as follows:1,Study and develop flameproof high-voltage battery, research the control mode,parameters optimization in charging of high-voltage battery, it is a overall that the control circuit of EPS and starter of stand-by fans, which enclosed in a explosion-proof box. The PLC control unit testes the power supply is normal or not and charge for the EPS battery, ensures equilibrium charging of high voltage battery through the control method designed.2,Research the flameproof inverter of mine short-time duty. In order to satisfy the bad environment of coal mine, study and develop the flameproof inverter of mine short-time duty. The Voltage amplitude could reach 660v. As for inverter circuits, the communication performance greatly raised and could reach our power quality standards needed for mine motors if the inverter circuits composed of IGBT which called all-controlling device working under the DSP control and for a long time in the situation when power fault.3,Research the matching relation between automatic switching device and the ventilator state in emergency system. As one variable of monitoring device for the ventilators, when the ventilator state is changing, the switch will carry on action, and then the emergency power supply begin to work.4,Study and develop emergency wind supply system for overall dig working face in coal mine aiming at the special coal mine power supply requirements.