Introduction  Under the current situation of increasing automation level of distribution network, in order to solve the problem that the influence of distribution automation is not considered in traditional distribution network power supply reliability assessment methods, in this paper, a method for rapid assessment of power supply reliability of urban distribution network is proposed, which takes into account the automatic partitioning of distribution network.

  Method  In this paper, based on the node division method of path characteristics, by demarcating automatic partitioning of distribution network, defining large and small segments, a method for evaluating the effect of power supply reliability improvement that was suitable for automatic partitioning of distribution network was proposed.

  Result  Compared with the industry standard for reliability evaluation of medium-voltage distribution network, the proposed method fully considers the influence of distribution automation on reducing fault location, isolation and switching operation time, and the evaluation result is reduced by about 22%.

  Conclusion  The proposed method can more accurately analyze the power supply reliability of the distribution network with a higher level of distribution automation, and is suitable for urban distribution network areas with a small power outage time base.