RAISING THE RELIABILITY OF OVERHEAD TRANSMISSION LINES UNDER THE ACTION OF ATMOSPHERIC LOADS

摘要

Problems of reliability of overhead transmission lines (OIL) under the action of atmospheric loads are considered. It is assumed that the integral distribution function of, for example, ice loads, obtained from data of weather stations is a random statistical function that characterizes the frequency of an event (specific ice load) at a point (weather station area). The general population of statistical data is the most reliable base for analysis. Since the atmospheric loads are distributed in space and act on spatially distributed OTL systems, it is recommended to evaluate the proof load and the yearly reliability of OTL in terms of one integral statistical function composed of annual load maxima measured by weather stations located closest to the annual extremum of the ice load on a territory possessing common features (flat-bottom land, low land, elevation) that range within no more than 150 m with respect to the altitude. It is suggested that the "Methodological Recommendations on Zoning of Atmospheric Loads on OTL Systems" should be updated with allowance for the obtained data.