Dynamic Response Analysis of Sub-conductor Non-synchronous Ice-shedding Under Strong Winds of Four-bundle Conductor
Current ice-shedding studies predominantly consider bundled conductors as equivalent to single conductors,neglecting the asynchronous ice-shedding of sub-conductors and not accounting for strong wind conditions.This paper takes the JLHA1/G1A-300/70 typed steel-cored aluminum stranded conductor as the object,establishing an ice-shedding jump model in ABAQUS for a five-span continuous four-bundled conductor-insulator-spacer system.It studies the dynamic response of four,single,two,and three sub-conductor ice-shedding scenarios under strong wind conditions to examine the impact of different ice-shedding conditions on sub-conductor vibration synchronization.The results indicate that strong winds significantly affect the maximum ice-shedding jump height of four-bundled conductors,with conductor tension increasing with wind speed.Under strong wind conditions,when sub-conductors shed ice asynchronously in large-span four-bundled conductors,synchronous ice-shedding of diagonally opposite and upper transverse sub-conductors is relatively stable,with sub-conductors exhibiting similar vibration trends.In other cases of asynchronous ice-shedding,sub-conductors exhibit asynchronous vibrations and severe conductor torsion,which may be irreversible.It is of significant engineering value for the design of insulation gaps and the operation and maintenance of transmission lines studying the dynamic response of asynchronous ice-shedding jumps in quad-bundled transmission line sub-conductors under strong wind conditions.
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维普
