Research on Dynamic Response of Ice-Shedding of Transmission Lines in Xinjiang Under Coupled Operating Conditions

At present, the field of research examining the transmission lines' reactive behavior under dynamic conditions within intricate environmental settings remains fraught with numerous inadequacies. Notably, the transmission corridors situated in Xinjiang, predominantly nestled amidst mountainous terrain, pose unique challenges, particularly in the realm of ice-shedding phenomena. The intricacies of this environment necessitate a nuanced understanding of ice-shedding responses as the established patterns observed in other regions cannot be directly applied to the mountainous regions of Xinjiang. In this research endeavor, we commence by delving into the derivation of a nonlinear finite element initial configuration tailored specifically for transmission lines in Xinjiang, leveraging the Newton-Raphson methodology. By incorporating actual transmission line parameters into iterative computations, we successfully establish a two-span three-phase ‘conductor-insulator’ finite element model, accompanied by a vector cloud depiction illustrating the intricate dynamics of ice-shedding jumps. Subsequently, we embark on an investigation into the multifaceted factors influencing conductor ice-shedding jumps, grounded in the fundamental dynamic equation. Through meticulous simulations, we discern the evolution of conductor points' positions and the peak longitudinal unbalanced tensions across varying ice-shedding magnitudes and altitude differentials. Our findings underscore the imperative to bolster the resilience of transmission towers against unbalanced tensions in terrain characterized by pronounced elevation disparities, thereby safeguarding the seamless operation of transmission lines. Lastly, we extend our analysis by constructing a comprehensive three-span three-phase ‘conductor-insulator’ finite element model that encapsulates the intricate tower-line coupling dynamics unique to Xinjiang. This endeavor culminates in simulations assessing the minimum phase-to-phase distance between conductors under six distinct ice-shedding scenarios amidst intense wind conditions. Our simulations, spanning various wind velocities and attack angles reveal insights into the frequency of safety distance breaches potential risk scenarios associated with these six ice-shedding conditions, and the optimal strategies for proactive de-icing in high-wind weather.