The standards IEC 61000-4-34 and GB/T 17626.34 have clear requirements for the peak impulse current capability of a voltage drop generator. Only when the peak impulse current capacity meets the requirements, can it be ensured that the generator output signal is correct. In order to meet these standards, several main factors affecting the peak impulse current capability are obtained by analyzing the working mechanism of the generator. From the results of the analysis, a 100 A three-phase high power voltage drop generator is made. The results of circuit simulation and measurement show that the peak impulse current capability of the standard can be fully achieved after several main factors are strictly controlled. This work is supported by National Natural Science Foundation of China (No. U1804252).