The article presents the procedure for the exact determination of the impedances of the direct order of the elements of the observed power network, and from the results of the calculation of the current of the three-pole short circuit in the mentioned network. For this purpose, original expressions were developed, which enable accurate calculations of the mentioned impedances. At the same time, three-pole short-circuit currents are used in network hubs and in elements that are directly connected to the hubs in question. Based on the originally developed expressions and the presented theory, a program entitled PAMREKS was created for the digital computer. The program was used to determine the impedances of the elements of the 110 kV power grid on the section TS 110/30 kV Dugi Rat - TS 110/35 kV Nerezisce, using the results of the three-pole short-circuit current calculation.