Mining flameproof transformer mobile substation is the special power supply equipment used with frequency converter, through the converter transformer is converted to star - Angle of dual output mode (30 ° phase Angle difference), 12 pulse high power rectifier unit (inverter) provides isolation converter, achieve high voltage series ordinary low harmonic and even no harmonic of ac asynchronous motor frequency control of motor speed, and reliability High, small harmonic current, overvoltage, undervoltage, short circuit, electricity leakage atresia, tripping over temperature alarming and overtemperature protection function.