Abstract: Line loss rate is an important synthetic technical economical index of power supply enterprises. Line loss is an important synthetic technoeconomic indicator for power suppy enterprises. Based on the theory of divider line loss rate, a new method, i.e., the percentage of electric energy consumption evaluation method, is proposed for evaluation of line loss rate by using equivalent relations. It is proved that the proposed method is easy, quick and simple, and applicable to the provincial-, prefecture- and county-level power supply enterprises. With the proposed method, the problem of ineffective evaluation of online loss rate between different grids can be solved.

Key words: power grid, line loss rate, percentage of electric energy consumption, technoeconomy, evaluation