Abstract
Known algorithms for parameter identification of design scheme based on the observability of the need to observe the conditions for the entire complex scheme. This paper presents an algorithm for determining the longitudinal conductivity of (active and inductive) equivalent circuit of network using synchronized vector measurements. Applying power balance formula for a single node in a complex form, calculation of conductivities is made when presenting power lines in the form of U-shaped design scheme. The proposed algorithm is constructed of two equations for each branch adjacent to the considered node without the use of a series of calculations. The correctness of the proposed algorithm implemented for the transit circuit 500 kV of the National power grid.