Wind and sleet loads on the aerial power lines in Ukraine

The paper deals with the problems of increasing the reliability of power network structures based on the analysis of the aerial power transmission line (PTL) supports damage and on the specification of the acting wind and sleet influences. In the result of the statistical processing of data on damages at PTL the reasons of the support structure failures have been classified with the peculiarities of operation mode and conditions of operation in Ukraine taken into account. The countryʹs territory zoning charts have been revised by climatic characteristics and the reliability indices for wind and sleet loads have been obtained.