Abstract:In this paper, the influence factors of wire and distribution transformer loss characteristics and 10kV line theory line loss rate are analyzed. Based on the structure characteristics of 10kV line of Guizhou Power Grid, the classification method and standard of Guizhou Power Grid 10kV line are put forward from the perspective of the size of the line loss rate. All 10kV lines of Guizhou Power Grid are divided into 18 types, and the theoretical line loss rate calculation model is established for each type of 10kV line by selecting the characteristic parameter value. Using the equivalent resistance method, the theoretical line loss rate benchmarking value of 18 types 10kV line of Guizhou Power Grid is calculated. For all 10kV line of Guizhou Power Grid to develop line loss management objectives and line loss control objectives of power grid planning, design, construction and transformation, the benchmarking value provides the theoretical basis and reference value.