Study of Jump Height of Transmission Lines After Ice-Shedding: Simulation and Natural Experimental Verification of Inhibition by Load Current Cycling Transferred Ice Melting

Ice-shedding jumps in transmission lines often lead to accidents such as flashover and tower collapse. Existing mitigation methods typically require the application of additional external equipment on conductors. In this study, the inhibitory effect of load current cycling transferred ice-melting technology (LCCT) on bundled conductors is investigated to eliminate the need for supplementary devices. The underlying principles are analyzed, a numerical simulation model is developed, and field experiments are conducted under natural environmental conditions. The results demonstrate that the inhibitory effect varies significantly with changes in the ice thickness and ice-melting conditions. For ice thicknesses ranging from 5 mm to 25 mm under identical melting conditions, the inhibitory effect increases by 67.8%. The most effective inhibition (93.4% average) occurs at the 25-mm ice thickness. Among the ice-melting conditions, H4 has the greatest inhibitory effect (95.4%). Other conditions yield inhibitory effects ranging from 2.6% to 76.2%. Field experiments confirm that condition H4 achieves a 91.4% inhibitory effect on four-split transmission lines.