Portable lightning current generating device and method for grounding device impact impedance testing

The invention discloses a portable lightning current generating device and method for grounding device impact impedance testing. The device comprises a power generator and a lightning current generator main loop test box. A rectifying silicon stack D, a charging resistor R1 and a direct-current voltage divider are connected in series to the output end of a boosting transformer T2. An energy-storage capacitor C is connected in parallel to the direct-current voltage divider. One end of a discharging switch S is connected with a positive electrode of the energy-storage capacitor C. The other end of the discharging switch S is connected with an adjustable wave modulated resistor R2. The other end of the adjustable wave modulated resistor R2 is connected with one end of an adjustable wave modulated inductor L. The other end of the adjustable wave modulated inductor L is connected with a grounding grid to be tested through a grounding testing current injection point. A grounding testing reverse current electrode and a reference voltage electrode are arranged on the periphery of the grounding grid to be tested. The ground testing reverse current electrode is connected to a negative electrode of the energy-storage capacitor C of a lightning current generator main loop. The device can simulate inductive effect and soil spark discharging effect really, and impact grounding resistance can be tested really.