Large-span power transmission line tower wave impedance measurement true model test method

The invention relates to a large-span power transmission line tower wave impedance measurement true model test method, which comprises the following steps that: an impulse current generator is arranged at the tower top of a power transmission line tower, the positive electrode of the impulse current generator is connected with the tower top of the power transmission line tower through a resistor R1 and a resistor R2 in sequence, a first voltage probe is arranged on the resistor R2, and a tower-entering current waveform is obtained through a first oscilloscope; each potential test point is connected with a second voltage probe, and the voltage waveform of each potential test point is obtained through a second oscilloscope; and obtaining the tower wave impedance according to the tower-entering current waveform and the voltage waveform of each potential test point. The impact current generator and the first voltage probe are placed at the top of the tower, so that the influence of lead wave impedance on a measur