In order to solve the problems of large measurement errors of existing measuring instruments, inability to digitize measurement results, and inability to measure and evaluate battery parameters, and considering that it is not suitable for the scene of buried grounding pile, special grounding device is required, and the measurement of grounding device requires large current excitation and other elements，this paper studies a new type of intelligent ground impedance measurement system.  In this paper, we proposed a high current output capacity impedance measurement equipment. This is a fully digital impedance measurement system based on ATmega328 to realize measurement data transmission to the cloud. The system can provide a reliable high current measurement program. The two-way DC/DC synchronous converter was modeled and simulated. Since a single excitation current could not ensure the accurate measurement of ground impedance, a stepped excitation current was used. The simulation shows that, according to the impedance measurement requirements, the system output voltage, The current can be adaptively switched. The system also realizes the functions of data visualization and data transmission. The live measurement results show that the system has higher measurement accuracy and smaller errors, and has considerable engineering application value.

The Ground impedance measurement，Synchronous buck，Communication system，Lightning protection，Railway transportation