Galloping-induced global reliability assessment for ice-covered three-phase bundled conductors considering both mechanical and electrical functional failure modes

Traditional galloping analysis for ice-covered conductors mainly focuses on the single failure mode, such as mechanical or electrical functional failure mode. In practice, galloping-induced all failure modes may occur in ice-covered conductors and only considering the single failure mode may inaccurately estimate the damage of conductor galloping. In this regard, this paper proposes the assessment framework of galloping-induced global reliability for ice-covered three-phase bundled conductors (ITBCs) considering both mechanical and electrical functional failure modes. Firstly, galloping-induced mechanical and electrical functional failure modes for ITBCs are analyzed, and the corresponding equivalent performance function is established. Sequently, galloping tension and interphase distance are calculated by the nonlinear finite element model. Then, the assessment framework of galloping-induced global reliability for ITBCs considering both mechanical and electrical functional failure modes is proposed based on the probability density evolution method (PDEM). Finally, the assessment for an example indicates that galloping-induced multiple failure modes have the likelihood of occurrence simultaneously in ITBCs. Moreover, with the increase of initial horizontal tension, galloping-induced global failure probability first decreases and then increases. Raising average wind speed significantly increases the global failure probabilities for ITBCs. The global failure probabilities of ITBCs display noteworthy disparities under different initial wind attack angles.