Streiiuk - Byelorussian State Polytechnical Academy (BSPA) Minsk, Belarus
Sergey - Byelorussian State Polytechnical Academy (BSPA) Minsk, Belarus
Bladyko - Byelorussian State Polytechnical Academy (BSPA) Minsk, Belarus

The complex mathematical model and computer program of wires dynamics calculation of overhead lines split phases under the wind action are proposed. The calculating model is based on wires presentation as flexible elastic thread and takes into account rigid and elastic spacers. Elaborated algorithm and program are used to evaluate spacers constructions and their dispositions in overhead line apan to limit wire aubapan oscillations. Wires oscillations between spacers (subspan oscillations) are essential for design of overhead lines (OL) interphase distance spacers. With such oscillations split wires placed in a horizontal plane an ellipsopdal motion bringing them together and removing them one from another. As the result of it considerable forces act on spacers (1...2,5% of tension during great number of oscillation cycles) what can result in fatigue damage of spacers. The problem of protection from subspan oscillations became actual due to construction of OL 1150 kV in woodless space of West Siberia and Kazakhstan. Defects often appeared in their work due to oscillations made to look for measures to suppress oscillations.