Voltage acceleration inverse time-delay over-current protection method used for micro power grid

The present invention relates to the field of power distribution system protection grid, to a voltage for accelerating microgrid inverse time overcurrent protection method using the relaying point is collected voltage, current information, and determines the occurrence of short-circuit fault is positive after the direction of the fault, the protection operation delay time calculation method is: in the conventional overcurrent protection inverse time setting calculation formula obtained by multiplying the voltage of the acceleration factor of the operation time after the acceleration, the acceleration voltage of factors taken to protect the installation and the three-phase voltage p.u. three line voltage minimum value. The present invention is removal outlet line short-circuit fault is very short, the operation can be achieved without delay, and the other points to different types of fault lines, also capable of rapid operation, to meet the requirements of fast.