Study on the Effect of Different Time Intervals on the Subsequent Impact Discharge of Soil under the Action of Continuous Impulse Current

With the continuous advancement of the observation and research of lightning characteristics, the characteristics of one-time breakdown and multiple discharges exhibited by lightning have been concerned by many experts in the international lightning protection and related fields. The use of continuous impulse waveforms is also recommended in standards such as CIGRE TB 549 and IEC-62305-1. The study found that when the continuous impulse time interval is long, the subsequent impulse voltage will be higher than the first impulse voltage, which will seriously threaten the safe operation of the power setup. Therefore, how to describe the characteristics of continuous impulse discharge has become a problem that everyone pays attention to. This paper intends to carry out continuous shock discharge experiments under the influence of soil type, electrode type and wave front time factors for centralized grounding bodies such as tower grounding devices, based on their typical local structures.Finally, the characteristics of continuous shock discharge are studied, and the evaluation method of dispersion performance based on the time interval of continuous shock discharge is carried out, and the method of continuous shock application in practical engineering is provided.