Abstract
Ice accretion on insulators in cold regions is a serious and inevitable problem for power transmission lines, which may cause over-load and icing flashover accidents and can lead to wide power outage. In this research work, multiphase numerical simulations are carried out to investigate the effect of wind flow angle & velocity on the ice accretion of transmission line composite insulators. To verify the simulation results, lab-based icing tests are carried out in artificial climate chamber of Chongqing University. Results show that the change of wind flow angle has an obvious effect on both accreted ice shape and ice mass of insulators. When wind flow angle changes from 0° to 90° or -90°, the ice mass increases before dropping sharply. Meanwhile, ice mass accretion on insulators with wind flow angle is more sensitive to the change of wind velocity. For V-shape insulator strings, the ice mass increased 47.22% in average compared to ordinary suspension insulators. The findings of this research can provide significant engineering reference for the design of transmission line in icing prone areas.
Highlights
Icing is a common natural phenomenon in cold regions and poses serious threats to the operations of overhead power transmission lines
2) The change of wind flow angle has an evident effect on the ice accretion of insulators both in ice shape and ice mass
For V-shape insulator strings with 60◦ - 120◦ inclination angle, the ice mass increases 47.22% in average compared to ordinary suspension insulators, which means that the insulators with wind flow angle (60◦ - 120◦) are prone to ice disaster
Summary
Icing is a common natural phenomenon in cold regions and poses serious threats to the operations of overhead power transmission lines. There are three main approaches to study the ice accretion on insulators: field observation, lab-based icing test and numerical simulation method [20]. The simulation results are verified by icing tests in artificial climate chamber. The ice simulation model performs well in calculation of ice mass accreted on insulators. Ice simulation method is more efficient and low-cost compared to the field observation and lab-based icing test
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