Study on Power Energy Information Changing Law for Distribution Network under Single-Phase Grounding Fault

As the probability of single-phase grounding faults in China’s urban and rural distribution network systems is getting higher and higher, accurate detection of single-phase grounding faults has become critical. This paper establishes a 110 kV-10 kV-400 V power grid simulation model to simulate the influence of single-phase grounding fault on the voltage, current and power of each line. Results show that: when a short circuit of phase A occurs in line two to ground, the current and power on the bus and the power supply terminal of line two increase drastically. The current and power on the power supply end of the line have only slight fluctuations. Since the transformer is grounded through the arc suppression coil, the voltage, current, and power at the load ends of line 1 and line 2 do not change much. This result provides an information basis for subsequent use of power energy information changing law for single-phase grounding line selection.