Development of a Reliable Modeling System for the Calculation of Rime Ice Loads on Overhead Transmission Lines
The development and validation of a model-based system for calculation and prediction of rime ice loads on overhead transmission lines is presented in this paper.The work is carried out within the frame of the FRonTLINES research project,and is motivated by recent mechanical failures of transmission lines in Norway caused by extensive ice loads,particularly in the areas exposed to in-cloud icing.The project comprises mesoscale numerical weather predictions(NWP),field measurements at test sites,laboratory tests,and ice accretion modeling including CFD simulations.Initial results of the FRonTLINES project indicated that the readily available formulae for calculation of collision efficiency were inadequate for the large icing diameters often observed at the test sites.In order to collect empirical data on the collision efficiency for large cylindrical objects,laboratory experiments were designed and carried out at the icing wind tunnel at VTT Technical Research Centre of Finland.Similar experiments were also carried out utilizing a CFD model including droplet trajectory calculations.Measurements also show that the relative difference between the maximum ice loads on single conductors and maximum ice loads on bundled conductors increase with increased ice load,and that the difference is mainly explained by more frequent ice shedding from bundled conductors.The paper demonstrates the importance of the low collision efficiency calculations for the purpose of calculating design ice loads.The next steps in the project are systematic verification of simulated ice loads from the modeling system as well as development of an improved calculation of collision efficiency for the large icing diameters.
in-cloud icing transmission line design icing sensor wind tunnel tests NWP CFD conductor bundles
Bj(o)rn Egil Nygaard (O)yvind Byrkjedal Emilie Iversen Maren Fredbo Hálfdán (A)gústsson (O)yvind Welgaard Igor Gutman Timo Karlsson Muhammad Virk Harold Mc Innes
Kjeller Vindteknikk AS Kjeller,Norway Statnett SF Norway STRI,High Voltage Testing and Consulting Sweden VTT Technical Research Centre of Finland Espoo,Finland UiT The Arctic University of Norway Narvik,Norway The Norwegian Meteorological Institute Oslo,Norway
国际会议
重庆
英文
1-6
2017-09-25（万方平台首次上网日期，不代表论文的发表时间）