Research on effects of neutral grounding modes on power supply reliability in distribution networks

Abstract

80% of faults are single-phase earth faults in distribution networks. Neutral grounding modes determine the handling process of single-phase earth faults, playing an important role in power supply reliability. Currently, there is lack of quantitative analysis for how the neutral grounding modes influence power supply reliability. In this paper, based on overhead line or cable distribution networks, the factors that grounding modes affect the power supply reliability, are analyzed and power supply reliability index models based on different grounding modes are built and calculated with field data. In the aspect of power supply reliability, this paper provides a theoretical reference to the selection of neutral grounding modes in distribution networks.