Accession Number : ADP001683

Title :   Estimation of Combined Ice and Wind Load on Overhead Transmission Lines,


Personal Author(s) : McComber,Pierre ; Martin,Richard ; Morin,Gilles ; Van,Luong Vo

Report Date : JUN 1983

Pagination or Media Count : 11

Abstract : In recent years, the design of high voltage transmission lines has been increasingly optimized. In areas where ice accretion on conductors is possible, the load resulting from added weight or increased aerodynamic forces becomes an important design parameter. At the present, calculations for combined icewind loads do not take into account the effect of the accretion shape. Ice accretions are formed on a conductor in a wind tunnel for three types of ice: soft rime, hard rime and glaze. Aerodynamic vertical and horizontal forces are then measured for different wind velocities. It is shown that when the wind remains in the direction of the ice build-up, the aerodynamic force due to the asymmetrical shape is responsible for a significant increase in the total force and that the present combined ice-wind load calculations can dangerously underestimate the risk of an overload. (Author)

Descriptors :   *Ice, *Ice formation, *Transmission lines, *Aerodynamic forces, *Wind, Cold weather tests, Loads(Forces), Static loads, Meteorological data, Statistical analysis, Comparison, Wind tunnel tests, Field tests, Supercooling, Photography, Data acquisition, Tables(Data)

Distribution Statement : APPROVED FOR PUBLIC RELEASE