Lightning-caused breaking simulation test method for power distribution network

The invention provides a lightning-caused breaking simulation test method for a power distribution network. The method comprises the steps of enabling a tested insulator P3 and a tested wire segment [delta]LS to be connected, and adjusting the ground capacitance of a power distribution true value simulation test network to enable the ground capacitance to reach different test current values; boosting the power distribution true value simulation test network to a rated voltage, and applying a lightning impulse voltage to the tested insulator by using an impulse voltage generator until a gap G and the tested insulator P3 flashover to the ground; and adjusting the ground capacitance of the power distribution true value simulation test network to enable the power distribution true value simulation test network to be subjected to wire breakage under the action of power frequency follow current so as to obtain the relationship between the corresponding power frequency follow current and theaction time when wires of