Research on Voltage Characteristics at Low-Voltage side of Single-Phase Fault under Different Grounding systems

In this paper, the voltage characteristics at low-voltage side of single-phase grounding fault in different grounding modes are discussed. Firstly, the characteristics of single-phase grounding fault on the medium-voltage side are obtained according to theoretical analysis. Secondly, the transmission characteristics of transformer are analyzed, and the voltage variation characteristics on the low-voltage side are summarized. The purpose of analyzing the influence of single-phase grounding fault on low-voltage side voltage is: to measure its influence on photovoltaic power generation, whether single-phase grounding fault affects the output characteristics of photovoltaic, and to explore which grounding mode, the low-voltage side voltage is least affected. In practice, this grounding method should be adopted to minimize the impact of single-phase grounding faults on photovoltaic power generation output.